cpython/Modules/structmodule.c

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/***********************************************************
Copyright 1991-1995 by Stichting Mathematisch Centrum, Amsterdam,
The Netherlands.
All Rights Reserved
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Permission to use, copy, modify, and distribute this software and its
documentation for any purpose and without fee is hereby granted,
provided that the above copyright notice appear in all copies and that
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both that copyright notice and this permission notice appear in
supporting documentation, and that the names of Stichting Mathematisch
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Centrum or CWI or Corporation for National Research Initiatives or
CNRI not be used in advertising or publicity pertaining to
distribution of the software without specific, written prior
permission.
While CWI is the initial source for this software, a modified version
is made available by the Corporation for National Research Initiatives
(CNRI) at the Internet address ftp://ftp.python.org.
STICHTING MATHEMATISCH CENTRUM AND CNRI DISCLAIM ALL WARRANTIES WITH
REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL STICHTING MATHEMATISCH
CENTRUM OR CNRI BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL
DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
PERFORMANCE OF THIS SOFTWARE.
******************************************************************/
/* struct module -- pack values into and (out of) strings */
Pretty much rewritten to fulfull several long-standing wishes: -- The whole implementation is now more table-driven. -- Unsigned integers. Format characters 'B', 'H', 'I' and 'L' mean unsigned byte, short, int and long. For 'I' and 'L', the return value is a Python long integer if a Python plain integer can't represent the required range (note: this is dependent on the size of the relevant C types only, not of the sign of the actual value). -- A new format character 's' packs/unpacks a string. When given a count prefix, this is the size of the string, not a repeat count like for the other format characters; e.g. '10s' means a single 10-byte string, while '10c' means 10 characters. For packing, the string is truncated or padded with null bytes as appropriate to make it fit. For unpacking, the resulting string always has exactly the specified number of bytes. As a special case, '0s' means a single, empty string (while '0c' means 0 characters). -- Various byte order options. The first character of the format string determines the byte order, size and alignment, as follows: First character Byte order size and alignment '@' native native '=' native standard '<' little-endian standard '>' big-endian standard '!' network (= big-endian) standard If the first character is not one of these, '@' is assumed. Native byte order is big-endian or little-endian, depending on the host system (e.g. Motorola and Sun are big-endian; Intel and DEC are little-endian). Native size and alignment are determined using the C compiler's sizeof expression. This is always combined with native byte order. Standard size and alignment are as follows: no alignment is required for any type (so you have to use pad bytes); short is 2 bytes; int and long are 4 bytes. In this mode, there is no support for float and double. Note the difference between '@' and '=': both use native byte order, but the size and alignment of the latter is standardized. The form '!' is available for those poor souls who can't remember whether network byte order is big-endian or little-endian. There is no way to indicate non-native byte order (i.e. force byte-swapping); use the appropriate choice of '<' or '>'.
1996-12-30 21:41:25 -04:00
/* New version supporting byte order, alignment and size options,
character strings, and unsigned numbers */
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#include "Python.h"
#include "mymath.h"
Pretty much rewritten to fulfull several long-standing wishes: -- The whole implementation is now more table-driven. -- Unsigned integers. Format characters 'B', 'H', 'I' and 'L' mean unsigned byte, short, int and long. For 'I' and 'L', the return value is a Python long integer if a Python plain integer can't represent the required range (note: this is dependent on the size of the relevant C types only, not of the sign of the actual value). -- A new format character 's' packs/unpacks a string. When given a count prefix, this is the size of the string, not a repeat count like for the other format characters; e.g. '10s' means a single 10-byte string, while '10c' means 10 characters. For packing, the string is truncated or padded with null bytes as appropriate to make it fit. For unpacking, the resulting string always has exactly the specified number of bytes. As a special case, '0s' means a single, empty string (while '0c' means 0 characters). -- Various byte order options. The first character of the format string determines the byte order, size and alignment, as follows: First character Byte order size and alignment '@' native native '=' native standard '<' little-endian standard '>' big-endian standard '!' network (= big-endian) standard If the first character is not one of these, '@' is assumed. Native byte order is big-endian or little-endian, depending on the host system (e.g. Motorola and Sun are big-endian; Intel and DEC are little-endian). Native size and alignment are determined using the C compiler's sizeof expression. This is always combined with native byte order. Standard size and alignment are as follows: no alignment is required for any type (so you have to use pad bytes); short is 2 bytes; int and long are 4 bytes. In this mode, there is no support for float and double. Note the difference between '@' and '=': both use native byte order, but the size and alignment of the latter is standardized. The form '!' is available for those poor souls who can't remember whether network byte order is big-endian or little-endian. There is no way to indicate non-native byte order (i.e. force byte-swapping); use the appropriate choice of '<' or '>'.
1996-12-30 21:41:25 -04:00
#include <limits.h>
#include <ctype.h>
Pretty much rewritten to fulfull several long-standing wishes: -- The whole implementation is now more table-driven. -- Unsigned integers. Format characters 'B', 'H', 'I' and 'L' mean unsigned byte, short, int and long. For 'I' and 'L', the return value is a Python long integer if a Python plain integer can't represent the required range (note: this is dependent on the size of the relevant C types only, not of the sign of the actual value). -- A new format character 's' packs/unpacks a string. When given a count prefix, this is the size of the string, not a repeat count like for the other format characters; e.g. '10s' means a single 10-byte string, while '10c' means 10 characters. For packing, the string is truncated or padded with null bytes as appropriate to make it fit. For unpacking, the resulting string always has exactly the specified number of bytes. As a special case, '0s' means a single, empty string (while '0c' means 0 characters). -- Various byte order options. The first character of the format string determines the byte order, size and alignment, as follows: First character Byte order size and alignment '@' native native '=' native standard '<' little-endian standard '>' big-endian standard '!' network (= big-endian) standard If the first character is not one of these, '@' is assumed. Native byte order is big-endian or little-endian, depending on the host system (e.g. Motorola and Sun are big-endian; Intel and DEC are little-endian). Native size and alignment are determined using the C compiler's sizeof expression. This is always combined with native byte order. Standard size and alignment are as follows: no alignment is required for any type (so you have to use pad bytes); short is 2 bytes; int and long are 4 bytes. In this mode, there is no support for float and double. Note the difference between '@' and '=': both use native byte order, but the size and alignment of the latter is standardized. The form '!' is available for those poor souls who can't remember whether network byte order is big-endian or little-endian. There is no way to indicate non-native byte order (i.e. force byte-swapping); use the appropriate choice of '<' or '>'.
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/* Exception */
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static PyObject *StructError;
/* Define various structs to figure out the alignments of types */
#ifdef __MWERKS__
/*
** XXXX We have a problem here. There are no unique alignment rules
** on the PowerPC mac.
*/
#ifdef __powerc
#pragma options align=mac68k
#endif
#endif /* __MWERKS__ */
typedef struct { char c; short x; } s_short;
typedef struct { char c; int x; } s_int;
typedef struct { char c; long x; } s_long;
typedef struct { char c; float x; } s_float;
typedef struct { char c; double x; } s_double;
#define SHORT_ALIGN (sizeof(s_short) - sizeof(short))
#define INT_ALIGN (sizeof(s_int) - sizeof(int))
#define LONG_ALIGN (sizeof(s_long) - sizeof(long))
#define FLOAT_ALIGN (sizeof(s_float) - sizeof(float))
#define DOUBLE_ALIGN (sizeof(s_double) - sizeof(double))
#ifdef __powerc
#pragma options align=reset
#endif
Pretty much rewritten to fulfull several long-standing wishes: -- The whole implementation is now more table-driven. -- Unsigned integers. Format characters 'B', 'H', 'I' and 'L' mean unsigned byte, short, int and long. For 'I' and 'L', the return value is a Python long integer if a Python plain integer can't represent the required range (note: this is dependent on the size of the relevant C types only, not of the sign of the actual value). -- A new format character 's' packs/unpacks a string. When given a count prefix, this is the size of the string, not a repeat count like for the other format characters; e.g. '10s' means a single 10-byte string, while '10c' means 10 characters. For packing, the string is truncated or padded with null bytes as appropriate to make it fit. For unpacking, the resulting string always has exactly the specified number of bytes. As a special case, '0s' means a single, empty string (while '0c' means 0 characters). -- Various byte order options. The first character of the format string determines the byte order, size and alignment, as follows: First character Byte order size and alignment '@' native native '=' native standard '<' little-endian standard '>' big-endian standard '!' network (= big-endian) standard If the first character is not one of these, '@' is assumed. Native byte order is big-endian or little-endian, depending on the host system (e.g. Motorola and Sun are big-endian; Intel and DEC are little-endian). Native size and alignment are determined using the C compiler's sizeof expression. This is always combined with native byte order. Standard size and alignment are as follows: no alignment is required for any type (so you have to use pad bytes); short is 2 bytes; int and long are 4 bytes. In this mode, there is no support for float and double. Note the difference between '@' and '=': both use native byte order, but the size and alignment of the latter is standardized. The form '!' is available for those poor souls who can't remember whether network byte order is big-endian or little-endian. There is no way to indicate non-native byte order (i.e. force byte-swapping); use the appropriate choice of '<' or '>'.
1996-12-30 21:41:25 -04:00
/* Helper routine to get a Python integer and raise the appropriate error
if it isn't one */
static int
Pretty much rewritten to fulfull several long-standing wishes: -- The whole implementation is now more table-driven. -- Unsigned integers. Format characters 'B', 'H', 'I' and 'L' mean unsigned byte, short, int and long. For 'I' and 'L', the return value is a Python long integer if a Python plain integer can't represent the required range (note: this is dependent on the size of the relevant C types only, not of the sign of the actual value). -- A new format character 's' packs/unpacks a string. When given a count prefix, this is the size of the string, not a repeat count like for the other format characters; e.g. '10s' means a single 10-byte string, while '10c' means 10 characters. For packing, the string is truncated or padded with null bytes as appropriate to make it fit. For unpacking, the resulting string always has exactly the specified number of bytes. As a special case, '0s' means a single, empty string (while '0c' means 0 characters). -- Various byte order options. The first character of the format string determines the byte order, size and alignment, as follows: First character Byte order size and alignment '@' native native '=' native standard '<' little-endian standard '>' big-endian standard '!' network (= big-endian) standard If the first character is not one of these, '@' is assumed. Native byte order is big-endian or little-endian, depending on the host system (e.g. Motorola and Sun are big-endian; Intel and DEC are little-endian). Native size and alignment are determined using the C compiler's sizeof expression. This is always combined with native byte order. Standard size and alignment are as follows: no alignment is required for any type (so you have to use pad bytes); short is 2 bytes; int and long are 4 bytes. In this mode, there is no support for float and double. Note the difference between '@' and '=': both use native byte order, but the size and alignment of the latter is standardized. The form '!' is available for those poor souls who can't remember whether network byte order is big-endian or little-endian. There is no way to indicate non-native byte order (i.e. force byte-swapping); use the appropriate choice of '<' or '>'.
1996-12-30 21:41:25 -04:00
get_long(v, p)
PyObject *v;
long *p;
{
long x = PyInt_AsLong(v);
if (x == -1 && PyErr_Occurred()) {
if (PyErr_Occurred() == PyExc_TypeError)
PyErr_SetString(StructError,
"required argument is not an integer");
return -1;
}
*p = x;
return 0;
}
/* Same, but handling unsigned long */
static int
get_ulong(v, p)
PyObject *v;
unsigned long *p;
{
if (PyLong_Check(v)) {
unsigned long x = PyLong_AsUnsignedLong(v);
if (x == (unsigned long)(-1) && PyErr_Occurred())
return -1;
*p = x;
return 0;
}
else {
return get_long(v, (long *)p);
}
}
/* Floating point helpers */
/* These use ANSI/IEEE Standard 754-1985 (Standard for Binary Floating
Point Arithmetic). See the following URL:
http://www.psc.edu/general/software/packages/ieee/ieee.html */
/* XXX Inf/NaN are not handled quite right (but underflow is!) */
static int
pack_float(x, p, incr)
double x; /* The number to pack */
char *p; /* Where to pack the high order byte */
int incr; /* 1 for big-endian; -1 for little-endian */
{
int s;
int e;
double f;
long fbits;
if (x < 0) {
s = 1;
x = -x;
}
else
s = 0;
f = frexp(x, &e);
/* Normalize f to be in the range [1.0, 2.0) */
if (0.5 <= f && f < 1.0) {
f *= 2.0;
e--;
}
else if (f == 0.0) {
e = 0;
}
else {
PyErr_SetString(PyExc_SystemError,
"frexp() result out of range");
return -1;
}
if (e >= 128) {
/* XXX 128 itself is reserved for Inf/NaN */
PyErr_SetString(PyExc_OverflowError,
"float too large to pack with f format");
return -1;
}
else if (e < -126) {
/* Gradual underflow */
f = ldexp(f, 126 + e);
e = 0;
}
else if (!(e == 0 && f == 0.0)) {
e += 127;
f -= 1.0; /* Get rid of leading 1 */
}
f *= 8388608.0; /* 2**23 */
fbits = (long) floor(f + 0.5); /* Round */
/* First byte */
*p = (s<<7) | (e>>1);
p += incr;
/* Second byte */
1997-04-11 17:44:04 -03:00
*p = (char) (((e&1)<<7) | (fbits>>16));
p += incr;
/* Third byte */
*p = (fbits>>8) & 0xFF;
p += incr;
/* Fourth byte */
*p = fbits&0xFF;
/* Done */
return 0;
}
static int
pack_double(x, p, incr)
double x; /* The number to pack */
char *p; /* Where to pack the high order byte */
int incr; /* 1 for big-endian; -1 for little-endian */
{
int s;
int e;
double f;
long fhi, flo;
if (x < 0) {
s = 1;
x = -x;
}
else
s = 0;
f = frexp(x, &e);
/* Normalize f to be in the range [1.0, 2.0) */
if (0.5 <= f && f < 1.0) {
f *= 2.0;
e--;
}
else if (f == 0.0) {
e = 0;
}
else {
PyErr_SetString(PyExc_SystemError,
"frexp() result out of range");
return -1;
}
if (e >= 1024) {
/* XXX 1024 itself is reserved for Inf/NaN */
PyErr_SetString(PyExc_OverflowError,
"float too large to pack with d format");
return -1;
}
else if (e < -1022) {
/* Gradual underflow */
f = ldexp(f, 1022 + e);
e = 0;
}
else if (!(e == 0 && f == 0.0)) {
e += 1023;
f -= 1.0; /* Get rid of leading 1 */
}
/* fhi receives the high 28 bits; flo the low 24 bits (== 52 bits) */
f *= 268435456.0; /* 2**28 */
fhi = (long) floor(f); /* Truncate */
f -= (double)fhi;
f *= 16777216.0; /* 2**24 */
flo = (long) floor(f + 0.5); /* Round */
/* First byte */
*p = (s<<7) | (e>>4);
p += incr;
/* Second byte */
1997-04-11 17:44:04 -03:00
*p = (char) (((e&0xF)<<4) | (fhi>>24));
p += incr;
/* Third byte */
*p = (fhi>>16) & 0xFF;
p += incr;
/* Fourth byte */
*p = (fhi>>8) & 0xFF;
p += incr;
/* Fifth byte */
*p = fhi & 0xFF;
p += incr;
/* Sixth byte */
*p = (flo>>16) & 0xFF;
p += incr;
/* Seventh byte */
*p = (flo>>8) & 0xFF;
p += incr;
/* Eighth byte */
*p = flo & 0xFF;
p += incr;
/* Done */
return 0;
}
static PyObject *
unpack_float(p, incr)
char *p; /* Where the high order byte is */
int incr; /* 1 for big-endian; -1 for little-endian */
{
int s;
int e;
long f;
double x;
/* First byte */
s = (*p>>7) & 1;
e = (*p & 0x7F) << 1;
p += incr;
/* Second byte */
e |= (*p>>7) & 1;
f = (*p & 0x7F) << 16;
p += incr;
/* Third byte */
f |= (*p & 0xFF) << 8;
p += incr;
/* Fourth byte */
f |= *p & 0xFF;
x = (double)f / 8388608.0;
/* XXX This sadly ignores Inf/NaN issues */
if (e == 0)
e = -126;
else {
x += 1.0;
e -= 127;
}
x = ldexp(x, e);
if (s)
x = -x;
return PyFloat_FromDouble(x);
}
static PyObject *
unpack_double(p, incr)
char *p; /* Where the high order byte is */
int incr; /* 1 for big-endian; -1 for little-endian */
{
int s;
int e;
long fhi, flo;
double x;
/* First byte */
s = (*p>>7) & 1;
e = (*p & 0x7F) << 4;
p += incr;
/* Second byte */
e |= (*p>>4) & 0xF;
fhi = (*p & 0xF) << 24;
p += incr;
/* Third byte */
fhi |= (*p & 0xFF) << 16;
p += incr;
/* Fourth byte */
fhi |= (*p & 0xFF) << 8;
p += incr;
/* Fifth byte */
fhi |= *p & 0xFF;
p += incr;
/* Sixth byte */
flo = (*p & 0xFF) << 16;
p += incr;
/* Seventh byte */
flo |= (*p & 0xFF) << 8;
p += incr;
/* Eighth byte */
flo |= *p & 0xFF;
p += incr;
x = (double)fhi + (double)flo / 16777216.0; /* 2**24 */
x /= 268435456.0; /* 2**28 */
/* XXX This sadly ignores Inf/NaN */
if (e == 0)
e = -1022;
else {
x += 1.0;
e -= 1023;
}
x = ldexp(x, e);
if (s)
x = -x;
return PyFloat_FromDouble(x);
}
Pretty much rewritten to fulfull several long-standing wishes: -- The whole implementation is now more table-driven. -- Unsigned integers. Format characters 'B', 'H', 'I' and 'L' mean unsigned byte, short, int and long. For 'I' and 'L', the return value is a Python long integer if a Python plain integer can't represent the required range (note: this is dependent on the size of the relevant C types only, not of the sign of the actual value). -- A new format character 's' packs/unpacks a string. When given a count prefix, this is the size of the string, not a repeat count like for the other format characters; e.g. '10s' means a single 10-byte string, while '10c' means 10 characters. For packing, the string is truncated or padded with null bytes as appropriate to make it fit. For unpacking, the resulting string always has exactly the specified number of bytes. As a special case, '0s' means a single, empty string (while '0c' means 0 characters). -- Various byte order options. The first character of the format string determines the byte order, size and alignment, as follows: First character Byte order size and alignment '@' native native '=' native standard '<' little-endian standard '>' big-endian standard '!' network (= big-endian) standard If the first character is not one of these, '@' is assumed. Native byte order is big-endian or little-endian, depending on the host system (e.g. Motorola and Sun are big-endian; Intel and DEC are little-endian). Native size and alignment are determined using the C compiler's sizeof expression. This is always combined with native byte order. Standard size and alignment are as follows: no alignment is required for any type (so you have to use pad bytes); short is 2 bytes; int and long are 4 bytes. In this mode, there is no support for float and double. Note the difference between '@' and '=': both use native byte order, but the size and alignment of the latter is standardized. The form '!' is available for those poor souls who can't remember whether network byte order is big-endian or little-endian. There is no way to indicate non-native byte order (i.e. force byte-swapping); use the appropriate choice of '<' or '>'.
1996-12-30 21:41:25 -04:00
/* The translation function for each format character is table driven */
typedef struct _formatdef {
char format;
int size;
Pretty much rewritten to fulfull several long-standing wishes: -- The whole implementation is now more table-driven. -- Unsigned integers. Format characters 'B', 'H', 'I' and 'L' mean unsigned byte, short, int and long. For 'I' and 'L', the return value is a Python long integer if a Python plain integer can't represent the required range (note: this is dependent on the size of the relevant C types only, not of the sign of the actual value). -- A new format character 's' packs/unpacks a string. When given a count prefix, this is the size of the string, not a repeat count like for the other format characters; e.g. '10s' means a single 10-byte string, while '10c' means 10 characters. For packing, the string is truncated or padded with null bytes as appropriate to make it fit. For unpacking, the resulting string always has exactly the specified number of bytes. As a special case, '0s' means a single, empty string (while '0c' means 0 characters). -- Various byte order options. The first character of the format string determines the byte order, size and alignment, as follows: First character Byte order size and alignment '@' native native '=' native standard '<' little-endian standard '>' big-endian standard '!' network (= big-endian) standard If the first character is not one of these, '@' is assumed. Native byte order is big-endian or little-endian, depending on the host system (e.g. Motorola and Sun are big-endian; Intel and DEC are little-endian). Native size and alignment are determined using the C compiler's sizeof expression. This is always combined with native byte order. Standard size and alignment are as follows: no alignment is required for any type (so you have to use pad bytes); short is 2 bytes; int and long are 4 bytes. In this mode, there is no support for float and double. Note the difference between '@' and '=': both use native byte order, but the size and alignment of the latter is standardized. The form '!' is available for those poor souls who can't remember whether network byte order is big-endian or little-endian. There is no way to indicate non-native byte order (i.e. force byte-swapping); use the appropriate choice of '<' or '>'.
1996-12-30 21:41:25 -04:00
int alignment;
PyObject* (*unpack) Py_PROTO((const char *,
const struct _formatdef *));
int (*pack) Py_PROTO((char *,
PyObject *,
const struct _formatdef *));
} formatdef;
static PyObject *
nu_char(p, f)
const char *p;
const formatdef *f;
{
return PyString_FromStringAndSize(p, 1);
}
static PyObject *
nu_byte(p, f)
const char *p;
const formatdef *f;
{
return PyInt_FromLong((long) *(signed char *)p);
}
static PyObject *
nu_ubyte(p, f)
const char *p;
const formatdef *f;
{
return PyInt_FromLong((long) *(unsigned char *)p);
}
static PyObject *
nu_short(p, f)
const char *p;
const formatdef *f;
{
return PyInt_FromLong((long) *(short *)p);
}
static PyObject *
nu_ushort(p, f)
const char *p;
const formatdef *f;
{
return PyInt_FromLong((long) *(unsigned short *)p);
}
static PyObject *
nu_int(p, f)
const char *p;
const formatdef *f;
{
return PyInt_FromLong((long) *(int *)p);
}
static PyObject *
nu_uint(p, f)
const char *p;
const formatdef *f;
{
unsigned int x = *(unsigned int *)p;
return PyLong_FromUnsignedLong((unsigned long)x);
Pretty much rewritten to fulfull several long-standing wishes: -- The whole implementation is now more table-driven. -- Unsigned integers. Format characters 'B', 'H', 'I' and 'L' mean unsigned byte, short, int and long. For 'I' and 'L', the return value is a Python long integer if a Python plain integer can't represent the required range (note: this is dependent on the size of the relevant C types only, not of the sign of the actual value). -- A new format character 's' packs/unpacks a string. When given a count prefix, this is the size of the string, not a repeat count like for the other format characters; e.g. '10s' means a single 10-byte string, while '10c' means 10 characters. For packing, the string is truncated or padded with null bytes as appropriate to make it fit. For unpacking, the resulting string always has exactly the specified number of bytes. As a special case, '0s' means a single, empty string (while '0c' means 0 characters). -- Various byte order options. The first character of the format string determines the byte order, size and alignment, as follows: First character Byte order size and alignment '@' native native '=' native standard '<' little-endian standard '>' big-endian standard '!' network (= big-endian) standard If the first character is not one of these, '@' is assumed. Native byte order is big-endian or little-endian, depending on the host system (e.g. Motorola and Sun are big-endian; Intel and DEC are little-endian). Native size and alignment are determined using the C compiler's sizeof expression. This is always combined with native byte order. Standard size and alignment are as follows: no alignment is required for any type (so you have to use pad bytes); short is 2 bytes; int and long are 4 bytes. In this mode, there is no support for float and double. Note the difference between '@' and '=': both use native byte order, but the size and alignment of the latter is standardized. The form '!' is available for those poor souls who can't remember whether network byte order is big-endian or little-endian. There is no way to indicate non-native byte order (i.e. force byte-swapping); use the appropriate choice of '<' or '>'.
1996-12-30 21:41:25 -04:00
}
static PyObject *
nu_long(p, f)
const char *p;
const formatdef *f;
{
return PyInt_FromLong(*(long *)p);
}
static PyObject *
nu_ulong(p, f)
const char *p;
const formatdef *f;
{
return PyLong_FromUnsignedLong(*(unsigned long *)p);
Pretty much rewritten to fulfull several long-standing wishes: -- The whole implementation is now more table-driven. -- Unsigned integers. Format characters 'B', 'H', 'I' and 'L' mean unsigned byte, short, int and long. For 'I' and 'L', the return value is a Python long integer if a Python plain integer can't represent the required range (note: this is dependent on the size of the relevant C types only, not of the sign of the actual value). -- A new format character 's' packs/unpacks a string. When given a count prefix, this is the size of the string, not a repeat count like for the other format characters; e.g. '10s' means a single 10-byte string, while '10c' means 10 characters. For packing, the string is truncated or padded with null bytes as appropriate to make it fit. For unpacking, the resulting string always has exactly the specified number of bytes. As a special case, '0s' means a single, empty string (while '0c' means 0 characters). -- Various byte order options. The first character of the format string determines the byte order, size and alignment, as follows: First character Byte order size and alignment '@' native native '=' native standard '<' little-endian standard '>' big-endian standard '!' network (= big-endian) standard If the first character is not one of these, '@' is assumed. Native byte order is big-endian or little-endian, depending on the host system (e.g. Motorola and Sun are big-endian; Intel and DEC are little-endian). Native size and alignment are determined using the C compiler's sizeof expression. This is always combined with native byte order. Standard size and alignment are as follows: no alignment is required for any type (so you have to use pad bytes); short is 2 bytes; int and long are 4 bytes. In this mode, there is no support for float and double. Note the difference between '@' and '=': both use native byte order, but the size and alignment of the latter is standardized. The form '!' is available for those poor souls who can't remember whether network byte order is big-endian or little-endian. There is no way to indicate non-native byte order (i.e. force byte-swapping); use the appropriate choice of '<' or '>'.
1996-12-30 21:41:25 -04:00
}
static PyObject *
nu_float(p, f)
const char *p;
const formatdef *f;
{
float x;
memcpy((char *)&x, p, sizeof(float));
return PyFloat_FromDouble((double)x);
}
static PyObject *
nu_double(p, f)
const char *p;
const formatdef *f;
{
double x;
memcpy((char *)&x, p, sizeof(double));
return PyFloat_FromDouble(x);
}
static int
np_byte(p, v, f)
char *p;
PyObject *v;
const formatdef *f;
{
long x;
if (get_long(v, &x) < 0)
return -1;
1997-04-11 17:44:04 -03:00
*p = (char)x;
Pretty much rewritten to fulfull several long-standing wishes: -- The whole implementation is now more table-driven. -- Unsigned integers. Format characters 'B', 'H', 'I' and 'L' mean unsigned byte, short, int and long. For 'I' and 'L', the return value is a Python long integer if a Python plain integer can't represent the required range (note: this is dependent on the size of the relevant C types only, not of the sign of the actual value). -- A new format character 's' packs/unpacks a string. When given a count prefix, this is the size of the string, not a repeat count like for the other format characters; e.g. '10s' means a single 10-byte string, while '10c' means 10 characters. For packing, the string is truncated or padded with null bytes as appropriate to make it fit. For unpacking, the resulting string always has exactly the specified number of bytes. As a special case, '0s' means a single, empty string (while '0c' means 0 characters). -- Various byte order options. The first character of the format string determines the byte order, size and alignment, as follows: First character Byte order size and alignment '@' native native '=' native standard '<' little-endian standard '>' big-endian standard '!' network (= big-endian) standard If the first character is not one of these, '@' is assumed. Native byte order is big-endian or little-endian, depending on the host system (e.g. Motorola and Sun are big-endian; Intel and DEC are little-endian). Native size and alignment are determined using the C compiler's sizeof expression. This is always combined with native byte order. Standard size and alignment are as follows: no alignment is required for any type (so you have to use pad bytes); short is 2 bytes; int and long are 4 bytes. In this mode, there is no support for float and double. Note the difference between '@' and '=': both use native byte order, but the size and alignment of the latter is standardized. The form '!' is available for those poor souls who can't remember whether network byte order is big-endian or little-endian. There is no way to indicate non-native byte order (i.e. force byte-swapping); use the appropriate choice of '<' or '>'.
1996-12-30 21:41:25 -04:00
return 0;
}
static int
np_char(p, v, f)
char *p;
PyObject *v;
const formatdef *f;
{
if (!PyString_Check(v) || PyString_Size(v) != 1) {
PyErr_SetString(StructError,
"char format require string of length 1");
return -1;
}
*p = *PyString_AsString(v);
return 0;
}
static int
np_short(p, v, f)
char *p;
PyObject *v;
const formatdef *f;
{
long x;
if (get_long(v, &x) < 0)
return -1;
1997-04-11 17:44:04 -03:00
* (short *)p = (short)x;
Pretty much rewritten to fulfull several long-standing wishes: -- The whole implementation is now more table-driven. -- Unsigned integers. Format characters 'B', 'H', 'I' and 'L' mean unsigned byte, short, int and long. For 'I' and 'L', the return value is a Python long integer if a Python plain integer can't represent the required range (note: this is dependent on the size of the relevant C types only, not of the sign of the actual value). -- A new format character 's' packs/unpacks a string. When given a count prefix, this is the size of the string, not a repeat count like for the other format characters; e.g. '10s' means a single 10-byte string, while '10c' means 10 characters. For packing, the string is truncated or padded with null bytes as appropriate to make it fit. For unpacking, the resulting string always has exactly the specified number of bytes. As a special case, '0s' means a single, empty string (while '0c' means 0 characters). -- Various byte order options. The first character of the format string determines the byte order, size and alignment, as follows: First character Byte order size and alignment '@' native native '=' native standard '<' little-endian standard '>' big-endian standard '!' network (= big-endian) standard If the first character is not one of these, '@' is assumed. Native byte order is big-endian or little-endian, depending on the host system (e.g. Motorola and Sun are big-endian; Intel and DEC are little-endian). Native size and alignment are determined using the C compiler's sizeof expression. This is always combined with native byte order. Standard size and alignment are as follows: no alignment is required for any type (so you have to use pad bytes); short is 2 bytes; int and long are 4 bytes. In this mode, there is no support for float and double. Note the difference between '@' and '=': both use native byte order, but the size and alignment of the latter is standardized. The form '!' is available for those poor souls who can't remember whether network byte order is big-endian or little-endian. There is no way to indicate non-native byte order (i.e. force byte-swapping); use the appropriate choice of '<' or '>'.
1996-12-30 21:41:25 -04:00
return 0;
}
static int
np_int(p, v, f)
char *p;
PyObject *v;
const formatdef *f;
{
long x;
if (get_long(v, &x) < 0)
return -1;
* (int *)p = x;
return 0;
}
static int
np_uint(p, v, f)
char *p;
PyObject *v;
const formatdef *f;
{
unsigned long x;
if (get_ulong(v, &x) < 0)
return -1;
* (unsigned int *)p = x;
return 0;
}
Pretty much rewritten to fulfull several long-standing wishes: -- The whole implementation is now more table-driven. -- Unsigned integers. Format characters 'B', 'H', 'I' and 'L' mean unsigned byte, short, int and long. For 'I' and 'L', the return value is a Python long integer if a Python plain integer can't represent the required range (note: this is dependent on the size of the relevant C types only, not of the sign of the actual value). -- A new format character 's' packs/unpacks a string. When given a count prefix, this is the size of the string, not a repeat count like for the other format characters; e.g. '10s' means a single 10-byte string, while '10c' means 10 characters. For packing, the string is truncated or padded with null bytes as appropriate to make it fit. For unpacking, the resulting string always has exactly the specified number of bytes. As a special case, '0s' means a single, empty string (while '0c' means 0 characters). -- Various byte order options. The first character of the format string determines the byte order, size and alignment, as follows: First character Byte order size and alignment '@' native native '=' native standard '<' little-endian standard '>' big-endian standard '!' network (= big-endian) standard If the first character is not one of these, '@' is assumed. Native byte order is big-endian or little-endian, depending on the host system (e.g. Motorola and Sun are big-endian; Intel and DEC are little-endian). Native size and alignment are determined using the C compiler's sizeof expression. This is always combined with native byte order. Standard size and alignment are as follows: no alignment is required for any type (so you have to use pad bytes); short is 2 bytes; int and long are 4 bytes. In this mode, there is no support for float and double. Note the difference between '@' and '=': both use native byte order, but the size and alignment of the latter is standardized. The form '!' is available for those poor souls who can't remember whether network byte order is big-endian or little-endian. There is no way to indicate non-native byte order (i.e. force byte-swapping); use the appropriate choice of '<' or '>'.
1996-12-30 21:41:25 -04:00
static int
np_long(p, v, f)
char *p;
PyObject *v;
const formatdef *f;
{
long x;
if (get_long(v, &x) < 0)
return -1;
* (long *)p = x;
return 0;
}
static int
np_ulong(p, v, f)
char *p;
PyObject *v;
const formatdef *f;
{
unsigned long x;
if (get_ulong(v, &x) < 0)
return -1;
* (unsigned long *)p = x;
return 0;
}
Pretty much rewritten to fulfull several long-standing wishes: -- The whole implementation is now more table-driven. -- Unsigned integers. Format characters 'B', 'H', 'I' and 'L' mean unsigned byte, short, int and long. For 'I' and 'L', the return value is a Python long integer if a Python plain integer can't represent the required range (note: this is dependent on the size of the relevant C types only, not of the sign of the actual value). -- A new format character 's' packs/unpacks a string. When given a count prefix, this is the size of the string, not a repeat count like for the other format characters; e.g. '10s' means a single 10-byte string, while '10c' means 10 characters. For packing, the string is truncated or padded with null bytes as appropriate to make it fit. For unpacking, the resulting string always has exactly the specified number of bytes. As a special case, '0s' means a single, empty string (while '0c' means 0 characters). -- Various byte order options. The first character of the format string determines the byte order, size and alignment, as follows: First character Byte order size and alignment '@' native native '=' native standard '<' little-endian standard '>' big-endian standard '!' network (= big-endian) standard If the first character is not one of these, '@' is assumed. Native byte order is big-endian or little-endian, depending on the host system (e.g. Motorola and Sun are big-endian; Intel and DEC are little-endian). Native size and alignment are determined using the C compiler's sizeof expression. This is always combined with native byte order. Standard size and alignment are as follows: no alignment is required for any type (so you have to use pad bytes); short is 2 bytes; int and long are 4 bytes. In this mode, there is no support for float and double. Note the difference between '@' and '=': both use native byte order, but the size and alignment of the latter is standardized. The form '!' is available for those poor souls who can't remember whether network byte order is big-endian or little-endian. There is no way to indicate non-native byte order (i.e. force byte-swapping); use the appropriate choice of '<' or '>'.
1996-12-30 21:41:25 -04:00
static int
np_float(p, v, f)
char *p;
PyObject *v;
const formatdef *f;
{
float x = (float)PyFloat_AsDouble(v);
if (x == -1 && PyErr_Occurred()) {
PyErr_SetString(StructError,
"required argument is not a float");
return -1;
}
memcpy(p, (char *)&x, sizeof(float));
return 0;
}
static int
np_double(p, v, f)
char *p;
PyObject *v;
const formatdef *f;
{
double x = PyFloat_AsDouble(v);
if (x == -1 && PyErr_Occurred()) {
PyErr_SetString(StructError,
"required argument is not a float");
return -1;
}
memcpy(p, (char *)&x, sizeof(double));
return 0;
}
static formatdef native_table[] = {
{'x', sizeof(char), 0, NULL},
{'b', sizeof(char), 0, nu_byte, np_byte},
{'B', sizeof(char), 0, nu_ubyte, np_byte},
{'c', sizeof(char), 0, nu_char, np_char},
{'s', sizeof(char), 0, NULL},
{'p', sizeof(char), 0, NULL},
Pretty much rewritten to fulfull several long-standing wishes: -- The whole implementation is now more table-driven. -- Unsigned integers. Format characters 'B', 'H', 'I' and 'L' mean unsigned byte, short, int and long. For 'I' and 'L', the return value is a Python long integer if a Python plain integer can't represent the required range (note: this is dependent on the size of the relevant C types only, not of the sign of the actual value). -- A new format character 's' packs/unpacks a string. When given a count prefix, this is the size of the string, not a repeat count like for the other format characters; e.g. '10s' means a single 10-byte string, while '10c' means 10 characters. For packing, the string is truncated or padded with null bytes as appropriate to make it fit. For unpacking, the resulting string always has exactly the specified number of bytes. As a special case, '0s' means a single, empty string (while '0c' means 0 characters). -- Various byte order options. The first character of the format string determines the byte order, size and alignment, as follows: First character Byte order size and alignment '@' native native '=' native standard '<' little-endian standard '>' big-endian standard '!' network (= big-endian) standard If the first character is not one of these, '@' is assumed. Native byte order is big-endian or little-endian, depending on the host system (e.g. Motorola and Sun are big-endian; Intel and DEC are little-endian). Native size and alignment are determined using the C compiler's sizeof expression. This is always combined with native byte order. Standard size and alignment are as follows: no alignment is required for any type (so you have to use pad bytes); short is 2 bytes; int and long are 4 bytes. In this mode, there is no support for float and double. Note the difference between '@' and '=': both use native byte order, but the size and alignment of the latter is standardized. The form '!' is available for those poor souls who can't remember whether network byte order is big-endian or little-endian. There is no way to indicate non-native byte order (i.e. force byte-swapping); use the appropriate choice of '<' or '>'.
1996-12-30 21:41:25 -04:00
{'h', sizeof(short), SHORT_ALIGN, nu_short, np_short},
{'H', sizeof(short), SHORT_ALIGN, nu_ushort, np_short},
{'i', sizeof(int), INT_ALIGN, nu_int, np_int},
{'I', sizeof(int), INT_ALIGN, nu_uint, np_uint},
Pretty much rewritten to fulfull several long-standing wishes: -- The whole implementation is now more table-driven. -- Unsigned integers. Format characters 'B', 'H', 'I' and 'L' mean unsigned byte, short, int and long. For 'I' and 'L', the return value is a Python long integer if a Python plain integer can't represent the required range (note: this is dependent on the size of the relevant C types only, not of the sign of the actual value). -- A new format character 's' packs/unpacks a string. When given a count prefix, this is the size of the string, not a repeat count like for the other format characters; e.g. '10s' means a single 10-byte string, while '10c' means 10 characters. For packing, the string is truncated or padded with null bytes as appropriate to make it fit. For unpacking, the resulting string always has exactly the specified number of bytes. As a special case, '0s' means a single, empty string (while '0c' means 0 characters). -- Various byte order options. The first character of the format string determines the byte order, size and alignment, as follows: First character Byte order size and alignment '@' native native '=' native standard '<' little-endian standard '>' big-endian standard '!' network (= big-endian) standard If the first character is not one of these, '@' is assumed. Native byte order is big-endian or little-endian, depending on the host system (e.g. Motorola and Sun are big-endian; Intel and DEC are little-endian). Native size and alignment are determined using the C compiler's sizeof expression. This is always combined with native byte order. Standard size and alignment are as follows: no alignment is required for any type (so you have to use pad bytes); short is 2 bytes; int and long are 4 bytes. In this mode, there is no support for float and double. Note the difference between '@' and '=': both use native byte order, but the size and alignment of the latter is standardized. The form '!' is available for those poor souls who can't remember whether network byte order is big-endian or little-endian. There is no way to indicate non-native byte order (i.e. force byte-swapping); use the appropriate choice of '<' or '>'.
1996-12-30 21:41:25 -04:00
{'l', sizeof(long), LONG_ALIGN, nu_long, np_long},
{'L', sizeof(long), LONG_ALIGN, nu_ulong, np_ulong},
Pretty much rewritten to fulfull several long-standing wishes: -- The whole implementation is now more table-driven. -- Unsigned integers. Format characters 'B', 'H', 'I' and 'L' mean unsigned byte, short, int and long. For 'I' and 'L', the return value is a Python long integer if a Python plain integer can't represent the required range (note: this is dependent on the size of the relevant C types only, not of the sign of the actual value). -- A new format character 's' packs/unpacks a string. When given a count prefix, this is the size of the string, not a repeat count like for the other format characters; e.g. '10s' means a single 10-byte string, while '10c' means 10 characters. For packing, the string is truncated or padded with null bytes as appropriate to make it fit. For unpacking, the resulting string always has exactly the specified number of bytes. As a special case, '0s' means a single, empty string (while '0c' means 0 characters). -- Various byte order options. The first character of the format string determines the byte order, size and alignment, as follows: First character Byte order size and alignment '@' native native '=' native standard '<' little-endian standard '>' big-endian standard '!' network (= big-endian) standard If the first character is not one of these, '@' is assumed. Native byte order is big-endian or little-endian, depending on the host system (e.g. Motorola and Sun are big-endian; Intel and DEC are little-endian). Native size and alignment are determined using the C compiler's sizeof expression. This is always combined with native byte order. Standard size and alignment are as follows: no alignment is required for any type (so you have to use pad bytes); short is 2 bytes; int and long are 4 bytes. In this mode, there is no support for float and double. Note the difference between '@' and '=': both use native byte order, but the size and alignment of the latter is standardized. The form '!' is available for those poor souls who can't remember whether network byte order is big-endian or little-endian. There is no way to indicate non-native byte order (i.e. force byte-swapping); use the appropriate choice of '<' or '>'.
1996-12-30 21:41:25 -04:00
{'f', sizeof(float), FLOAT_ALIGN, nu_float, np_float},
{'d', sizeof(double), DOUBLE_ALIGN, nu_double, np_double},
{0}
};
static PyObject *
bu_int(p, f)
const char *p;
const formatdef *f;
{
long x = 0;
int i = f->size;
do {
x = (x<<8) | (*p++ & 0xFF);
} while (--i > 0);
i = 8*(sizeof(long) - f->size);
if (i) {
x <<= i;
x >>= i;
}
return PyInt_FromLong(x);
}
static PyObject *
bu_uint(p, f)
const char *p;
const formatdef *f;
{
unsigned long x = 0;
Pretty much rewritten to fulfull several long-standing wishes: -- The whole implementation is now more table-driven. -- Unsigned integers. Format characters 'B', 'H', 'I' and 'L' mean unsigned byte, short, int and long. For 'I' and 'L', the return value is a Python long integer if a Python plain integer can't represent the required range (note: this is dependent on the size of the relevant C types only, not of the sign of the actual value). -- A new format character 's' packs/unpacks a string. When given a count prefix, this is the size of the string, not a repeat count like for the other format characters; e.g. '10s' means a single 10-byte string, while '10c' means 10 characters. For packing, the string is truncated or padded with null bytes as appropriate to make it fit. For unpacking, the resulting string always has exactly the specified number of bytes. As a special case, '0s' means a single, empty string (while '0c' means 0 characters). -- Various byte order options. The first character of the format string determines the byte order, size and alignment, as follows: First character Byte order size and alignment '@' native native '=' native standard '<' little-endian standard '>' big-endian standard '!' network (= big-endian) standard If the first character is not one of these, '@' is assumed. Native byte order is big-endian or little-endian, depending on the host system (e.g. Motorola and Sun are big-endian; Intel and DEC are little-endian). Native size and alignment are determined using the C compiler's sizeof expression. This is always combined with native byte order. Standard size and alignment are as follows: no alignment is required for any type (so you have to use pad bytes); short is 2 bytes; int and long are 4 bytes. In this mode, there is no support for float and double. Note the difference between '@' and '=': both use native byte order, but the size and alignment of the latter is standardized. The form '!' is available for those poor souls who can't remember whether network byte order is big-endian or little-endian. There is no way to indicate non-native byte order (i.e. force byte-swapping); use the appropriate choice of '<' or '>'.
1996-12-30 21:41:25 -04:00
int i = f->size;
do {
x = (x<<8) | (*p++ & 0xFF);
} while (--i > 0);
return PyLong_FromUnsignedLong(x);
Pretty much rewritten to fulfull several long-standing wishes: -- The whole implementation is now more table-driven. -- Unsigned integers. Format characters 'B', 'H', 'I' and 'L' mean unsigned byte, short, int and long. For 'I' and 'L', the return value is a Python long integer if a Python plain integer can't represent the required range (note: this is dependent on the size of the relevant C types only, not of the sign of the actual value). -- A new format character 's' packs/unpacks a string. When given a count prefix, this is the size of the string, not a repeat count like for the other format characters; e.g. '10s' means a single 10-byte string, while '10c' means 10 characters. For packing, the string is truncated or padded with null bytes as appropriate to make it fit. For unpacking, the resulting string always has exactly the specified number of bytes. As a special case, '0s' means a single, empty string (while '0c' means 0 characters). -- Various byte order options. The first character of the format string determines the byte order, size and alignment, as follows: First character Byte order size and alignment '@' native native '=' native standard '<' little-endian standard '>' big-endian standard '!' network (= big-endian) standard If the first character is not one of these, '@' is assumed. Native byte order is big-endian or little-endian, depending on the host system (e.g. Motorola and Sun are big-endian; Intel and DEC are little-endian). Native size and alignment are determined using the C compiler's sizeof expression. This is always combined with native byte order. Standard size and alignment are as follows: no alignment is required for any type (so you have to use pad bytes); short is 2 bytes; int and long are 4 bytes. In this mode, there is no support for float and double. Note the difference between '@' and '=': both use native byte order, but the size and alignment of the latter is standardized. The form '!' is available for those poor souls who can't remember whether network byte order is big-endian or little-endian. There is no way to indicate non-native byte order (i.e. force byte-swapping); use the appropriate choice of '<' or '>'.
1996-12-30 21:41:25 -04:00
}
static PyObject *
bu_float(p, f)
const char *p;
const formatdef *f;
{
return unpack_float(p, 1);
}
static PyObject *
bu_double(p, f)
const char *p;
const formatdef *f;
{
return unpack_double(p, 1);
}
Pretty much rewritten to fulfull several long-standing wishes: -- The whole implementation is now more table-driven. -- Unsigned integers. Format characters 'B', 'H', 'I' and 'L' mean unsigned byte, short, int and long. For 'I' and 'L', the return value is a Python long integer if a Python plain integer can't represent the required range (note: this is dependent on the size of the relevant C types only, not of the sign of the actual value). -- A new format character 's' packs/unpacks a string. When given a count prefix, this is the size of the string, not a repeat count like for the other format characters; e.g. '10s' means a single 10-byte string, while '10c' means 10 characters. For packing, the string is truncated or padded with null bytes as appropriate to make it fit. For unpacking, the resulting string always has exactly the specified number of bytes. As a special case, '0s' means a single, empty string (while '0c' means 0 characters). -- Various byte order options. The first character of the format string determines the byte order, size and alignment, as follows: First character Byte order size and alignment '@' native native '=' native standard '<' little-endian standard '>' big-endian standard '!' network (= big-endian) standard If the first character is not one of these, '@' is assumed. Native byte order is big-endian or little-endian, depending on the host system (e.g. Motorola and Sun are big-endian; Intel and DEC are little-endian). Native size and alignment are determined using the C compiler's sizeof expression. This is always combined with native byte order. Standard size and alignment are as follows: no alignment is required for any type (so you have to use pad bytes); short is 2 bytes; int and long are 4 bytes. In this mode, there is no support for float and double. Note the difference between '@' and '=': both use native byte order, but the size and alignment of the latter is standardized. The form '!' is available for those poor souls who can't remember whether network byte order is big-endian or little-endian. There is no way to indicate non-native byte order (i.e. force byte-swapping); use the appropriate choice of '<' or '>'.
1996-12-30 21:41:25 -04:00
static int
bp_int(p, v, f)
char *p;
PyObject *v;
const formatdef *f;
{
long x;
int i;
if (get_long(v, &x) < 0)
return -1;
i = f->size;
do {
1997-04-11 17:44:04 -03:00
p[--i] = (char)x;
Pretty much rewritten to fulfull several long-standing wishes: -- The whole implementation is now more table-driven. -- Unsigned integers. Format characters 'B', 'H', 'I' and 'L' mean unsigned byte, short, int and long. For 'I' and 'L', the return value is a Python long integer if a Python plain integer can't represent the required range (note: this is dependent on the size of the relevant C types only, not of the sign of the actual value). -- A new format character 's' packs/unpacks a string. When given a count prefix, this is the size of the string, not a repeat count like for the other format characters; e.g. '10s' means a single 10-byte string, while '10c' means 10 characters. For packing, the string is truncated or padded with null bytes as appropriate to make it fit. For unpacking, the resulting string always has exactly the specified number of bytes. As a special case, '0s' means a single, empty string (while '0c' means 0 characters). -- Various byte order options. The first character of the format string determines the byte order, size and alignment, as follows: First character Byte order size and alignment '@' native native '=' native standard '<' little-endian standard '>' big-endian standard '!' network (= big-endian) standard If the first character is not one of these, '@' is assumed. Native byte order is big-endian or little-endian, depending on the host system (e.g. Motorola and Sun are big-endian; Intel and DEC are little-endian). Native size and alignment are determined using the C compiler's sizeof expression. This is always combined with native byte order. Standard size and alignment are as follows: no alignment is required for any type (so you have to use pad bytes); short is 2 bytes; int and long are 4 bytes. In this mode, there is no support for float and double. Note the difference between '@' and '=': both use native byte order, but the size and alignment of the latter is standardized. The form '!' is available for those poor souls who can't remember whether network byte order is big-endian or little-endian. There is no way to indicate non-native byte order (i.e. force byte-swapping); use the appropriate choice of '<' or '>'.
1996-12-30 21:41:25 -04:00
x >>= 8;
} while (i > 0);
return 0;
}
static int
bp_uint(p, v, f)
char *p;
PyObject *v;
const formatdef *f;
{
unsigned long x;
int i;
if (get_ulong(v, &x) < 0)
return -1;
i = f->size;
do {
1997-04-11 17:44:04 -03:00
p[--i] = (char)x;
x >>= 8;
} while (i > 0);
return 0;
}
static int
bp_float(p, v, f)
char *p;
PyObject *v;
const formatdef *f;
{
double x = PyFloat_AsDouble(v);
if (x == -1 && PyErr_Occurred()) {
PyErr_SetString(StructError,
"required argument is not a float");
return -1;
}
return pack_float(x, p, 1);
}
static int
bp_double(p, v, f)
char *p;
PyObject *v;
const formatdef *f;
{
double x = PyFloat_AsDouble(v);
if (x == -1 && PyErr_Occurred()) {
PyErr_SetString(StructError,
"required argument is not a float");
return -1;
}
return pack_double(x, p, 1);
}
Pretty much rewritten to fulfull several long-standing wishes: -- The whole implementation is now more table-driven. -- Unsigned integers. Format characters 'B', 'H', 'I' and 'L' mean unsigned byte, short, int and long. For 'I' and 'L', the return value is a Python long integer if a Python plain integer can't represent the required range (note: this is dependent on the size of the relevant C types only, not of the sign of the actual value). -- A new format character 's' packs/unpacks a string. When given a count prefix, this is the size of the string, not a repeat count like for the other format characters; e.g. '10s' means a single 10-byte string, while '10c' means 10 characters. For packing, the string is truncated or padded with null bytes as appropriate to make it fit. For unpacking, the resulting string always has exactly the specified number of bytes. As a special case, '0s' means a single, empty string (while '0c' means 0 characters). -- Various byte order options. The first character of the format string determines the byte order, size and alignment, as follows: First character Byte order size and alignment '@' native native '=' native standard '<' little-endian standard '>' big-endian standard '!' network (= big-endian) standard If the first character is not one of these, '@' is assumed. Native byte order is big-endian or little-endian, depending on the host system (e.g. Motorola and Sun are big-endian; Intel and DEC are little-endian). Native size and alignment are determined using the C compiler's sizeof expression. This is always combined with native byte order. Standard size and alignment are as follows: no alignment is required for any type (so you have to use pad bytes); short is 2 bytes; int and long are 4 bytes. In this mode, there is no support for float and double. Note the difference between '@' and '=': both use native byte order, but the size and alignment of the latter is standardized. The form '!' is available for those poor souls who can't remember whether network byte order is big-endian or little-endian. There is no way to indicate non-native byte order (i.e. force byte-swapping); use the appropriate choice of '<' or '>'.
1996-12-30 21:41:25 -04:00
static formatdef bigendian_table[] = {
{'x', 1, 0, NULL},
{'b', 1, 0, bu_int, bp_int},
{'B', 1, 0, bu_uint, bp_int},
{'c', 1, 0, nu_char, np_char},
{'s', 1, 0, NULL},
{'p', 1, 0, NULL},
Pretty much rewritten to fulfull several long-standing wishes: -- The whole implementation is now more table-driven. -- Unsigned integers. Format characters 'B', 'H', 'I' and 'L' mean unsigned byte, short, int and long. For 'I' and 'L', the return value is a Python long integer if a Python plain integer can't represent the required range (note: this is dependent on the size of the relevant C types only, not of the sign of the actual value). -- A new format character 's' packs/unpacks a string. When given a count prefix, this is the size of the string, not a repeat count like for the other format characters; e.g. '10s' means a single 10-byte string, while '10c' means 10 characters. For packing, the string is truncated or padded with null bytes as appropriate to make it fit. For unpacking, the resulting string always has exactly the specified number of bytes. As a special case, '0s' means a single, empty string (while '0c' means 0 characters). -- Various byte order options. The first character of the format string determines the byte order, size and alignment, as follows: First character Byte order size and alignment '@' native native '=' native standard '<' little-endian standard '>' big-endian standard '!' network (= big-endian) standard If the first character is not one of these, '@' is assumed. Native byte order is big-endian or little-endian, depending on the host system (e.g. Motorola and Sun are big-endian; Intel and DEC are little-endian). Native size and alignment are determined using the C compiler's sizeof expression. This is always combined with native byte order. Standard size and alignment are as follows: no alignment is required for any type (so you have to use pad bytes); short is 2 bytes; int and long are 4 bytes. In this mode, there is no support for float and double. Note the difference between '@' and '=': both use native byte order, but the size and alignment of the latter is standardized. The form '!' is available for those poor souls who can't remember whether network byte order is big-endian or little-endian. There is no way to indicate non-native byte order (i.e. force byte-swapping); use the appropriate choice of '<' or '>'.
1996-12-30 21:41:25 -04:00
{'h', 2, 0, bu_int, bp_int},
{'H', 2, 0, bu_uint, bp_uint},
Pretty much rewritten to fulfull several long-standing wishes: -- The whole implementation is now more table-driven. -- Unsigned integers. Format characters 'B', 'H', 'I' and 'L' mean unsigned byte, short, int and long. For 'I' and 'L', the return value is a Python long integer if a Python plain integer can't represent the required range (note: this is dependent on the size of the relevant C types only, not of the sign of the actual value). -- A new format character 's' packs/unpacks a string. When given a count prefix, this is the size of the string, not a repeat count like for the other format characters; e.g. '10s' means a single 10-byte string, while '10c' means 10 characters. For packing, the string is truncated or padded with null bytes as appropriate to make it fit. For unpacking, the resulting string always has exactly the specified number of bytes. As a special case, '0s' means a single, empty string (while '0c' means 0 characters). -- Various byte order options. The first character of the format string determines the byte order, size and alignment, as follows: First character Byte order size and alignment '@' native native '=' native standard '<' little-endian standard '>' big-endian standard '!' network (= big-endian) standard If the first character is not one of these, '@' is assumed. Native byte order is big-endian or little-endian, depending on the host system (e.g. Motorola and Sun are big-endian; Intel and DEC are little-endian). Native size and alignment are determined using the C compiler's sizeof expression. This is always combined with native byte order. Standard size and alignment are as follows: no alignment is required for any type (so you have to use pad bytes); short is 2 bytes; int and long are 4 bytes. In this mode, there is no support for float and double. Note the difference between '@' and '=': both use native byte order, but the size and alignment of the latter is standardized. The form '!' is available for those poor souls who can't remember whether network byte order is big-endian or little-endian. There is no way to indicate non-native byte order (i.e. force byte-swapping); use the appropriate choice of '<' or '>'.
1996-12-30 21:41:25 -04:00
{'i', 4, 0, bu_int, bp_int},
{'I', 4, 0, bu_uint, bp_uint},
Pretty much rewritten to fulfull several long-standing wishes: -- The whole implementation is now more table-driven. -- Unsigned integers. Format characters 'B', 'H', 'I' and 'L' mean unsigned byte, short, int and long. For 'I' and 'L', the return value is a Python long integer if a Python plain integer can't represent the required range (note: this is dependent on the size of the relevant C types only, not of the sign of the actual value). -- A new format character 's' packs/unpacks a string. When given a count prefix, this is the size of the string, not a repeat count like for the other format characters; e.g. '10s' means a single 10-byte string, while '10c' means 10 characters. For packing, the string is truncated or padded with null bytes as appropriate to make it fit. For unpacking, the resulting string always has exactly the specified number of bytes. As a special case, '0s' means a single, empty string (while '0c' means 0 characters). -- Various byte order options. The first character of the format string determines the byte order, size and alignment, as follows: First character Byte order size and alignment '@' native native '=' native standard '<' little-endian standard '>' big-endian standard '!' network (= big-endian) standard If the first character is not one of these, '@' is assumed. Native byte order is big-endian or little-endian, depending on the host system (e.g. Motorola and Sun are big-endian; Intel and DEC are little-endian). Native size and alignment are determined using the C compiler's sizeof expression. This is always combined with native byte order. Standard size and alignment are as follows: no alignment is required for any type (so you have to use pad bytes); short is 2 bytes; int and long are 4 bytes. In this mode, there is no support for float and double. Note the difference between '@' and '=': both use native byte order, but the size and alignment of the latter is standardized. The form '!' is available for those poor souls who can't remember whether network byte order is big-endian or little-endian. There is no way to indicate non-native byte order (i.e. force byte-swapping); use the appropriate choice of '<' or '>'.
1996-12-30 21:41:25 -04:00
{'l', 4, 0, bu_int, bp_int},
{'L', 4, 0, bu_uint, bp_uint},
{'f', 4, 0, bu_float, bp_float},
{'d', 8, 0, bu_double, bp_double},
Pretty much rewritten to fulfull several long-standing wishes: -- The whole implementation is now more table-driven. -- Unsigned integers. Format characters 'B', 'H', 'I' and 'L' mean unsigned byte, short, int and long. For 'I' and 'L', the return value is a Python long integer if a Python plain integer can't represent the required range (note: this is dependent on the size of the relevant C types only, not of the sign of the actual value). -- A new format character 's' packs/unpacks a string. When given a count prefix, this is the size of the string, not a repeat count like for the other format characters; e.g. '10s' means a single 10-byte string, while '10c' means 10 characters. For packing, the string is truncated or padded with null bytes as appropriate to make it fit. For unpacking, the resulting string always has exactly the specified number of bytes. As a special case, '0s' means a single, empty string (while '0c' means 0 characters). -- Various byte order options. The first character of the format string determines the byte order, size and alignment, as follows: First character Byte order size and alignment '@' native native '=' native standard '<' little-endian standard '>' big-endian standard '!' network (= big-endian) standard If the first character is not one of these, '@' is assumed. Native byte order is big-endian or little-endian, depending on the host system (e.g. Motorola and Sun are big-endian; Intel and DEC are little-endian). Native size and alignment are determined using the C compiler's sizeof expression. This is always combined with native byte order. Standard size and alignment are as follows: no alignment is required for any type (so you have to use pad bytes); short is 2 bytes; int and long are 4 bytes. In this mode, there is no support for float and double. Note the difference between '@' and '=': both use native byte order, but the size and alignment of the latter is standardized. The form '!' is available for those poor souls who can't remember whether network byte order is big-endian or little-endian. There is no way to indicate non-native byte order (i.e. force byte-swapping); use the appropriate choice of '<' or '>'.
1996-12-30 21:41:25 -04:00
{0}
};
static PyObject *
lu_int(p, f)
const char *p;
const formatdef *f;
{
long x = 0;
int i = f->size;
do {
x = (x<<8) | (p[--i] & 0xFF);
} while (i > 0);
i = 8*(sizeof(long) - f->size);
if (i) {
x <<= i;
x >>= i;
}
return PyInt_FromLong(x);
}
static PyObject *
lu_uint(p, f)
const char *p;
const formatdef *f;
{
unsigned long x = 0;
Pretty much rewritten to fulfull several long-standing wishes: -- The whole implementation is now more table-driven. -- Unsigned integers. Format characters 'B', 'H', 'I' and 'L' mean unsigned byte, short, int and long. For 'I' and 'L', the return value is a Python long integer if a Python plain integer can't represent the required range (note: this is dependent on the size of the relevant C types only, not of the sign of the actual value). -- A new format character 's' packs/unpacks a string. When given a count prefix, this is the size of the string, not a repeat count like for the other format characters; e.g. '10s' means a single 10-byte string, while '10c' means 10 characters. For packing, the string is truncated or padded with null bytes as appropriate to make it fit. For unpacking, the resulting string always has exactly the specified number of bytes. As a special case, '0s' means a single, empty string (while '0c' means 0 characters). -- Various byte order options. The first character of the format string determines the byte order, size and alignment, as follows: First character Byte order size and alignment '@' native native '=' native standard '<' little-endian standard '>' big-endian standard '!' network (= big-endian) standard If the first character is not one of these, '@' is assumed. Native byte order is big-endian or little-endian, depending on the host system (e.g. Motorola and Sun are big-endian; Intel and DEC are little-endian). Native size and alignment are determined using the C compiler's sizeof expression. This is always combined with native byte order. Standard size and alignment are as follows: no alignment is required for any type (so you have to use pad bytes); short is 2 bytes; int and long are 4 bytes. In this mode, there is no support for float and double. Note the difference between '@' and '=': both use native byte order, but the size and alignment of the latter is standardized. The form '!' is available for those poor souls who can't remember whether network byte order is big-endian or little-endian. There is no way to indicate non-native byte order (i.e. force byte-swapping); use the appropriate choice of '<' or '>'.
1996-12-30 21:41:25 -04:00
int i = f->size;
do {
x = (x<<8) | (p[--i] & 0xFF);
} while (i > 0);
return PyLong_FromUnsignedLong(x);
Pretty much rewritten to fulfull several long-standing wishes: -- The whole implementation is now more table-driven. -- Unsigned integers. Format characters 'B', 'H', 'I' and 'L' mean unsigned byte, short, int and long. For 'I' and 'L', the return value is a Python long integer if a Python plain integer can't represent the required range (note: this is dependent on the size of the relevant C types only, not of the sign of the actual value). -- A new format character 's' packs/unpacks a string. When given a count prefix, this is the size of the string, not a repeat count like for the other format characters; e.g. '10s' means a single 10-byte string, while '10c' means 10 characters. For packing, the string is truncated or padded with null bytes as appropriate to make it fit. For unpacking, the resulting string always has exactly the specified number of bytes. As a special case, '0s' means a single, empty string (while '0c' means 0 characters). -- Various byte order options. The first character of the format string determines the byte order, size and alignment, as follows: First character Byte order size and alignment '@' native native '=' native standard '<' little-endian standard '>' big-endian standard '!' network (= big-endian) standard If the first character is not one of these, '@' is assumed. Native byte order is big-endian or little-endian, depending on the host system (e.g. Motorola and Sun are big-endian; Intel and DEC are little-endian). Native size and alignment are determined using the C compiler's sizeof expression. This is always combined with native byte order. Standard size and alignment are as follows: no alignment is required for any type (so you have to use pad bytes); short is 2 bytes; int and long are 4 bytes. In this mode, there is no support for float and double. Note the difference between '@' and '=': both use native byte order, but the size and alignment of the latter is standardized. The form '!' is available for those poor souls who can't remember whether network byte order is big-endian or little-endian. There is no way to indicate non-native byte order (i.e. force byte-swapping); use the appropriate choice of '<' or '>'.
1996-12-30 21:41:25 -04:00
}
static PyObject *
lu_float(p, f)
const char *p;
const formatdef *f;
{
return unpack_float(p+3, -1);
}
static PyObject *
lu_double(p, f)
const char *p;
const formatdef *f;
{
return unpack_double(p+7, -1);
}
Pretty much rewritten to fulfull several long-standing wishes: -- The whole implementation is now more table-driven. -- Unsigned integers. Format characters 'B', 'H', 'I' and 'L' mean unsigned byte, short, int and long. For 'I' and 'L', the return value is a Python long integer if a Python plain integer can't represent the required range (note: this is dependent on the size of the relevant C types only, not of the sign of the actual value). -- A new format character 's' packs/unpacks a string. When given a count prefix, this is the size of the string, not a repeat count like for the other format characters; e.g. '10s' means a single 10-byte string, while '10c' means 10 characters. For packing, the string is truncated or padded with null bytes as appropriate to make it fit. For unpacking, the resulting string always has exactly the specified number of bytes. As a special case, '0s' means a single, empty string (while '0c' means 0 characters). -- Various byte order options. The first character of the format string determines the byte order, size and alignment, as follows: First character Byte order size and alignment '@' native native '=' native standard '<' little-endian standard '>' big-endian standard '!' network (= big-endian) standard If the first character is not one of these, '@' is assumed. Native byte order is big-endian or little-endian, depending on the host system (e.g. Motorola and Sun are big-endian; Intel and DEC are little-endian). Native size and alignment are determined using the C compiler's sizeof expression. This is always combined with native byte order. Standard size and alignment are as follows: no alignment is required for any type (so you have to use pad bytes); short is 2 bytes; int and long are 4 bytes. In this mode, there is no support for float and double. Note the difference between '@' and '=': both use native byte order, but the size and alignment of the latter is standardized. The form '!' is available for those poor souls who can't remember whether network byte order is big-endian or little-endian. There is no way to indicate non-native byte order (i.e. force byte-swapping); use the appropriate choice of '<' or '>'.
1996-12-30 21:41:25 -04:00
static int
lp_int(p, v, f)
char *p;
PyObject *v;
const formatdef *f;
{
long x;
int i;
if (get_long(v, &x) < 0)
return -1;
i = f->size;
do {
1997-04-11 17:44:04 -03:00
*p++ = (char)x;
Pretty much rewritten to fulfull several long-standing wishes: -- The whole implementation is now more table-driven. -- Unsigned integers. Format characters 'B', 'H', 'I' and 'L' mean unsigned byte, short, int and long. For 'I' and 'L', the return value is a Python long integer if a Python plain integer can't represent the required range (note: this is dependent on the size of the relevant C types only, not of the sign of the actual value). -- A new format character 's' packs/unpacks a string. When given a count prefix, this is the size of the string, not a repeat count like for the other format characters; e.g. '10s' means a single 10-byte string, while '10c' means 10 characters. For packing, the string is truncated or padded with null bytes as appropriate to make it fit. For unpacking, the resulting string always has exactly the specified number of bytes. As a special case, '0s' means a single, empty string (while '0c' means 0 characters). -- Various byte order options. The first character of the format string determines the byte order, size and alignment, as follows: First character Byte order size and alignment '@' native native '=' native standard '<' little-endian standard '>' big-endian standard '!' network (= big-endian) standard If the first character is not one of these, '@' is assumed. Native byte order is big-endian or little-endian, depending on the host system (e.g. Motorola and Sun are big-endian; Intel and DEC are little-endian). Native size and alignment are determined using the C compiler's sizeof expression. This is always combined with native byte order. Standard size and alignment are as follows: no alignment is required for any type (so you have to use pad bytes); short is 2 bytes; int and long are 4 bytes. In this mode, there is no support for float and double. Note the difference between '@' and '=': both use native byte order, but the size and alignment of the latter is standardized. The form '!' is available for those poor souls who can't remember whether network byte order is big-endian or little-endian. There is no way to indicate non-native byte order (i.e. force byte-swapping); use the appropriate choice of '<' or '>'.
1996-12-30 21:41:25 -04:00
x >>= 8;
} while (--i > 0);
return 0;
}
static int
lp_uint(p, v, f)
char *p;
PyObject *v;
const formatdef *f;
{
unsigned long x;
int i;
if (get_ulong(v, &x) < 0)
return -1;
i = f->size;
do {
1997-04-11 17:44:04 -03:00
*p++ = (char)x;
x >>= 8;
} while (--i > 0);
return 0;
}
static int
lp_float(p, v, f)
char *p;
PyObject *v;
const formatdef *f;
{
double x = PyFloat_AsDouble(v);
if (x == -1 && PyErr_Occurred()) {
PyErr_SetString(StructError,
"required argument is not a float");
return -1;
}
return pack_float(x, p+3, -1);
}
static int
lp_double(p, v, f)
char *p;
PyObject *v;
const formatdef *f;
{
double x = PyFloat_AsDouble(v);
if (x == -1 && PyErr_Occurred()) {
PyErr_SetString(StructError,
"required argument is not a float");
return -1;
}
return pack_double(x, p+7, -1);
}
Pretty much rewritten to fulfull several long-standing wishes: -- The whole implementation is now more table-driven. -- Unsigned integers. Format characters 'B', 'H', 'I' and 'L' mean unsigned byte, short, int and long. For 'I' and 'L', the return value is a Python long integer if a Python plain integer can't represent the required range (note: this is dependent on the size of the relevant C types only, not of the sign of the actual value). -- A new format character 's' packs/unpacks a string. When given a count prefix, this is the size of the string, not a repeat count like for the other format characters; e.g. '10s' means a single 10-byte string, while '10c' means 10 characters. For packing, the string is truncated or padded with null bytes as appropriate to make it fit. For unpacking, the resulting string always has exactly the specified number of bytes. As a special case, '0s' means a single, empty string (while '0c' means 0 characters). -- Various byte order options. The first character of the format string determines the byte order, size and alignment, as follows: First character Byte order size and alignment '@' native native '=' native standard '<' little-endian standard '>' big-endian standard '!' network (= big-endian) standard If the first character is not one of these, '@' is assumed. Native byte order is big-endian or little-endian, depending on the host system (e.g. Motorola and Sun are big-endian; Intel and DEC are little-endian). Native size and alignment are determined using the C compiler's sizeof expression. This is always combined with native byte order. Standard size and alignment are as follows: no alignment is required for any type (so you have to use pad bytes); short is 2 bytes; int and long are 4 bytes. In this mode, there is no support for float and double. Note the difference between '@' and '=': both use native byte order, but the size and alignment of the latter is standardized. The form '!' is available for those poor souls who can't remember whether network byte order is big-endian or little-endian. There is no way to indicate non-native byte order (i.e. force byte-swapping); use the appropriate choice of '<' or '>'.
1996-12-30 21:41:25 -04:00
static formatdef lilendian_table[] = {
{'x', 1, 0, NULL},
{'b', 1, 0, lu_int, lp_int},
{'B', 1, 0, lu_uint, lp_int},
{'c', 1, 0, nu_char, np_char},
{'s', 1, 0, NULL},
{'p', 1, 0, NULL},
Pretty much rewritten to fulfull several long-standing wishes: -- The whole implementation is now more table-driven. -- Unsigned integers. Format characters 'B', 'H', 'I' and 'L' mean unsigned byte, short, int and long. For 'I' and 'L', the return value is a Python long integer if a Python plain integer can't represent the required range (note: this is dependent on the size of the relevant C types only, not of the sign of the actual value). -- A new format character 's' packs/unpacks a string. When given a count prefix, this is the size of the string, not a repeat count like for the other format characters; e.g. '10s' means a single 10-byte string, while '10c' means 10 characters. For packing, the string is truncated or padded with null bytes as appropriate to make it fit. For unpacking, the resulting string always has exactly the specified number of bytes. As a special case, '0s' means a single, empty string (while '0c' means 0 characters). -- Various byte order options. The first character of the format string determines the byte order, size and alignment, as follows: First character Byte order size and alignment '@' native native '=' native standard '<' little-endian standard '>' big-endian standard '!' network (= big-endian) standard If the first character is not one of these, '@' is assumed. Native byte order is big-endian or little-endian, depending on the host system (e.g. Motorola and Sun are big-endian; Intel and DEC are little-endian). Native size and alignment are determined using the C compiler's sizeof expression. This is always combined with native byte order. Standard size and alignment are as follows: no alignment is required for any type (so you have to use pad bytes); short is 2 bytes; int and long are 4 bytes. In this mode, there is no support for float and double. Note the difference between '@' and '=': both use native byte order, but the size and alignment of the latter is standardized. The form '!' is available for those poor souls who can't remember whether network byte order is big-endian or little-endian. There is no way to indicate non-native byte order (i.e. force byte-swapping); use the appropriate choice of '<' or '>'.
1996-12-30 21:41:25 -04:00
{'h', 2, 0, lu_int, lp_int},
{'H', 2, 0, lu_uint, lp_uint},
Pretty much rewritten to fulfull several long-standing wishes: -- The whole implementation is now more table-driven. -- Unsigned integers. Format characters 'B', 'H', 'I' and 'L' mean unsigned byte, short, int and long. For 'I' and 'L', the return value is a Python long integer if a Python plain integer can't represent the required range (note: this is dependent on the size of the relevant C types only, not of the sign of the actual value). -- A new format character 's' packs/unpacks a string. When given a count prefix, this is the size of the string, not a repeat count like for the other format characters; e.g. '10s' means a single 10-byte string, while '10c' means 10 characters. For packing, the string is truncated or padded with null bytes as appropriate to make it fit. For unpacking, the resulting string always has exactly the specified number of bytes. As a special case, '0s' means a single, empty string (while '0c' means 0 characters). -- Various byte order options. The first character of the format string determines the byte order, size and alignment, as follows: First character Byte order size and alignment '@' native native '=' native standard '<' little-endian standard '>' big-endian standard '!' network (= big-endian) standard If the first character is not one of these, '@' is assumed. Native byte order is big-endian or little-endian, depending on the host system (e.g. Motorola and Sun are big-endian; Intel and DEC are little-endian). Native size and alignment are determined using the C compiler's sizeof expression. This is always combined with native byte order. Standard size and alignment are as follows: no alignment is required for any type (so you have to use pad bytes); short is 2 bytes; int and long are 4 bytes. In this mode, there is no support for float and double. Note the difference between '@' and '=': both use native byte order, but the size and alignment of the latter is standardized. The form '!' is available for those poor souls who can't remember whether network byte order is big-endian or little-endian. There is no way to indicate non-native byte order (i.e. force byte-swapping); use the appropriate choice of '<' or '>'.
1996-12-30 21:41:25 -04:00
{'i', 4, 0, lu_int, lp_int},
{'I', 4, 0, lu_uint, lp_uint},
Pretty much rewritten to fulfull several long-standing wishes: -- The whole implementation is now more table-driven. -- Unsigned integers. Format characters 'B', 'H', 'I' and 'L' mean unsigned byte, short, int and long. For 'I' and 'L', the return value is a Python long integer if a Python plain integer can't represent the required range (note: this is dependent on the size of the relevant C types only, not of the sign of the actual value). -- A new format character 's' packs/unpacks a string. When given a count prefix, this is the size of the string, not a repeat count like for the other format characters; e.g. '10s' means a single 10-byte string, while '10c' means 10 characters. For packing, the string is truncated or padded with null bytes as appropriate to make it fit. For unpacking, the resulting string always has exactly the specified number of bytes. As a special case, '0s' means a single, empty string (while '0c' means 0 characters). -- Various byte order options. The first character of the format string determines the byte order, size and alignment, as follows: First character Byte order size and alignment '@' native native '=' native standard '<' little-endian standard '>' big-endian standard '!' network (= big-endian) standard If the first character is not one of these, '@' is assumed. Native byte order is big-endian or little-endian, depending on the host system (e.g. Motorola and Sun are big-endian; Intel and DEC are little-endian). Native size and alignment are determined using the C compiler's sizeof expression. This is always combined with native byte order. Standard size and alignment are as follows: no alignment is required for any type (so you have to use pad bytes); short is 2 bytes; int and long are 4 bytes. In this mode, there is no support for float and double. Note the difference between '@' and '=': both use native byte order, but the size and alignment of the latter is standardized. The form '!' is available for those poor souls who can't remember whether network byte order is big-endian or little-endian. There is no way to indicate non-native byte order (i.e. force byte-swapping); use the appropriate choice of '<' or '>'.
1996-12-30 21:41:25 -04:00
{'l', 4, 0, lu_int, lp_int},
{'L', 4, 0, lu_uint, lp_uint},
{'f', 4, 0, lu_float, lp_float},
{'d', 8, 0, lu_double, lp_double},
Pretty much rewritten to fulfull several long-standing wishes: -- The whole implementation is now more table-driven. -- Unsigned integers. Format characters 'B', 'H', 'I' and 'L' mean unsigned byte, short, int and long. For 'I' and 'L', the return value is a Python long integer if a Python plain integer can't represent the required range (note: this is dependent on the size of the relevant C types only, not of the sign of the actual value). -- A new format character 's' packs/unpacks a string. When given a count prefix, this is the size of the string, not a repeat count like for the other format characters; e.g. '10s' means a single 10-byte string, while '10c' means 10 characters. For packing, the string is truncated or padded with null bytes as appropriate to make it fit. For unpacking, the resulting string always has exactly the specified number of bytes. As a special case, '0s' means a single, empty string (while '0c' means 0 characters). -- Various byte order options. The first character of the format string determines the byte order, size and alignment, as follows: First character Byte order size and alignment '@' native native '=' native standard '<' little-endian standard '>' big-endian standard '!' network (= big-endian) standard If the first character is not one of these, '@' is assumed. Native byte order is big-endian or little-endian, depending on the host system (e.g. Motorola and Sun are big-endian; Intel and DEC are little-endian). Native size and alignment are determined using the C compiler's sizeof expression. This is always combined with native byte order. Standard size and alignment are as follows: no alignment is required for any type (so you have to use pad bytes); short is 2 bytes; int and long are 4 bytes. In this mode, there is no support for float and double. Note the difference between '@' and '=': both use native byte order, but the size and alignment of the latter is standardized. The form '!' is available for those poor souls who can't remember whether network byte order is big-endian or little-endian. There is no way to indicate non-native byte order (i.e. force byte-swapping); use the appropriate choice of '<' or '>'.
1996-12-30 21:41:25 -04:00
{0}
};
static const formatdef *
whichtable(pfmt)
const char **pfmt;
{
const char *fmt = (*pfmt)++; /* May be backed out of later */
switch (*fmt) {
case '<':
return lilendian_table;
case '>':
case '!': /* Network byte order is big-endian */
return bigendian_table;
case '=': { /* Host byte order -- different from native in aligment! */
int n = 1;
char *p = (char *) &n;
if (*p == 1)
return lilendian_table;
else
return bigendian_table;
}
default:
--*pfmt; /* Back out of pointer increment */
/* Fall through */
case '@':
return native_table;
}
}
/* Get the table entry for a format code */
static const formatdef *
getentry(c, f)
int c;
Pretty much rewritten to fulfull several long-standing wishes: -- The whole implementation is now more table-driven. -- Unsigned integers. Format characters 'B', 'H', 'I' and 'L' mean unsigned byte, short, int and long. For 'I' and 'L', the return value is a Python long integer if a Python plain integer can't represent the required range (note: this is dependent on the size of the relevant C types only, not of the sign of the actual value). -- A new format character 's' packs/unpacks a string. When given a count prefix, this is the size of the string, not a repeat count like for the other format characters; e.g. '10s' means a single 10-byte string, while '10c' means 10 characters. For packing, the string is truncated or padded with null bytes as appropriate to make it fit. For unpacking, the resulting string always has exactly the specified number of bytes. As a special case, '0s' means a single, empty string (while '0c' means 0 characters). -- Various byte order options. The first character of the format string determines the byte order, size and alignment, as follows: First character Byte order size and alignment '@' native native '=' native standard '<' little-endian standard '>' big-endian standard '!' network (= big-endian) standard If the first character is not one of these, '@' is assumed. Native byte order is big-endian or little-endian, depending on the host system (e.g. Motorola and Sun are big-endian; Intel and DEC are little-endian). Native size and alignment are determined using the C compiler's sizeof expression. This is always combined with native byte order. Standard size and alignment are as follows: no alignment is required for any type (so you have to use pad bytes); short is 2 bytes; int and long are 4 bytes. In this mode, there is no support for float and double. Note the difference between '@' and '=': both use native byte order, but the size and alignment of the latter is standardized. The form '!' is available for those poor souls who can't remember whether network byte order is big-endian or little-endian. There is no way to indicate non-native byte order (i.e. force byte-swapping); use the appropriate choice of '<' or '>'.
1996-12-30 21:41:25 -04:00
const formatdef *f;
{
Pretty much rewritten to fulfull several long-standing wishes: -- The whole implementation is now more table-driven. -- Unsigned integers. Format characters 'B', 'H', 'I' and 'L' mean unsigned byte, short, int and long. For 'I' and 'L', the return value is a Python long integer if a Python plain integer can't represent the required range (note: this is dependent on the size of the relevant C types only, not of the sign of the actual value). -- A new format character 's' packs/unpacks a string. When given a count prefix, this is the size of the string, not a repeat count like for the other format characters; e.g. '10s' means a single 10-byte string, while '10c' means 10 characters. For packing, the string is truncated or padded with null bytes as appropriate to make it fit. For unpacking, the resulting string always has exactly the specified number of bytes. As a special case, '0s' means a single, empty string (while '0c' means 0 characters). -- Various byte order options. The first character of the format string determines the byte order, size and alignment, as follows: First character Byte order size and alignment '@' native native '=' native standard '<' little-endian standard '>' big-endian standard '!' network (= big-endian) standard If the first character is not one of these, '@' is assumed. Native byte order is big-endian or little-endian, depending on the host system (e.g. Motorola and Sun are big-endian; Intel and DEC are little-endian). Native size and alignment are determined using the C compiler's sizeof expression. This is always combined with native byte order. Standard size and alignment are as follows: no alignment is required for any type (so you have to use pad bytes); short is 2 bytes; int and long are 4 bytes. In this mode, there is no support for float and double. Note the difference between '@' and '=': both use native byte order, but the size and alignment of the latter is standardized. The form '!' is available for those poor souls who can't remember whether network byte order is big-endian or little-endian. There is no way to indicate non-native byte order (i.e. force byte-swapping); use the appropriate choice of '<' or '>'.
1996-12-30 21:41:25 -04:00
for (; f->format != '\0'; f++) {
if (f->format == c) {
return f;
}
}
PyErr_SetString(StructError, "bad char in struct format");
return NULL;
}
/* Align a size according to a format code */
Pretty much rewritten to fulfull several long-standing wishes: -- The whole implementation is now more table-driven. -- Unsigned integers. Format characters 'B', 'H', 'I' and 'L' mean unsigned byte, short, int and long. For 'I' and 'L', the return value is a Python long integer if a Python plain integer can't represent the required range (note: this is dependent on the size of the relevant C types only, not of the sign of the actual value). -- A new format character 's' packs/unpacks a string. When given a count prefix, this is the size of the string, not a repeat count like for the other format characters; e.g. '10s' means a single 10-byte string, while '10c' means 10 characters. For packing, the string is truncated or padded with null bytes as appropriate to make it fit. For unpacking, the resulting string always has exactly the specified number of bytes. As a special case, '0s' means a single, empty string (while '0c' means 0 characters). -- Various byte order options. The first character of the format string determines the byte order, size and alignment, as follows: First character Byte order size and alignment '@' native native '=' native standard '<' little-endian standard '>' big-endian standard '!' network (= big-endian) standard If the first character is not one of these, '@' is assumed. Native byte order is big-endian or little-endian, depending on the host system (e.g. Motorola and Sun are big-endian; Intel and DEC are little-endian). Native size and alignment are determined using the C compiler's sizeof expression. This is always combined with native byte order. Standard size and alignment are as follows: no alignment is required for any type (so you have to use pad bytes); short is 2 bytes; int and long are 4 bytes. In this mode, there is no support for float and double. Note the difference between '@' and '=': both use native byte order, but the size and alignment of the latter is standardized. The form '!' is available for those poor souls who can't remember whether network byte order is big-endian or little-endian. There is no way to indicate non-native byte order (i.e. force byte-swapping); use the appropriate choice of '<' or '>'.
1996-12-30 21:41:25 -04:00
static int
align(size, c, e)
int size;
int c;
const formatdef *e;
{
if (e->format == c) {
if (e->alignment) {
size = ((size + e->alignment - 1)
/ e->alignment)
* e->alignment;
}
}
Pretty much rewritten to fulfull several long-standing wishes: -- The whole implementation is now more table-driven. -- Unsigned integers. Format characters 'B', 'H', 'I' and 'L' mean unsigned byte, short, int and long. For 'I' and 'L', the return value is a Python long integer if a Python plain integer can't represent the required range (note: this is dependent on the size of the relevant C types only, not of the sign of the actual value). -- A new format character 's' packs/unpacks a string. When given a count prefix, this is the size of the string, not a repeat count like for the other format characters; e.g. '10s' means a single 10-byte string, while '10c' means 10 characters. For packing, the string is truncated or padded with null bytes as appropriate to make it fit. For unpacking, the resulting string always has exactly the specified number of bytes. As a special case, '0s' means a single, empty string (while '0c' means 0 characters). -- Various byte order options. The first character of the format string determines the byte order, size and alignment, as follows: First character Byte order size and alignment '@' native native '=' native standard '<' little-endian standard '>' big-endian standard '!' network (= big-endian) standard If the first character is not one of these, '@' is assumed. Native byte order is big-endian or little-endian, depending on the host system (e.g. Motorola and Sun are big-endian; Intel and DEC are little-endian). Native size and alignment are determined using the C compiler's sizeof expression. This is always combined with native byte order. Standard size and alignment are as follows: no alignment is required for any type (so you have to use pad bytes); short is 2 bytes; int and long are 4 bytes. In this mode, there is no support for float and double. Note the difference between '@' and '=': both use native byte order, but the size and alignment of the latter is standardized. The form '!' is available for those poor souls who can't remember whether network byte order is big-endian or little-endian. There is no way to indicate non-native byte order (i.e. force byte-swapping); use the appropriate choice of '<' or '>'.
1996-12-30 21:41:25 -04:00
return size;
}
/* calculate the size of a format string */
static int
Pretty much rewritten to fulfull several long-standing wishes: -- The whole implementation is now more table-driven. -- Unsigned integers. Format characters 'B', 'H', 'I' and 'L' mean unsigned byte, short, int and long. For 'I' and 'L', the return value is a Python long integer if a Python plain integer can't represent the required range (note: this is dependent on the size of the relevant C types only, not of the sign of the actual value). -- A new format character 's' packs/unpacks a string. When given a count prefix, this is the size of the string, not a repeat count like for the other format characters; e.g. '10s' means a single 10-byte string, while '10c' means 10 characters. For packing, the string is truncated or padded with null bytes as appropriate to make it fit. For unpacking, the resulting string always has exactly the specified number of bytes. As a special case, '0s' means a single, empty string (while '0c' means 0 characters). -- Various byte order options. The first character of the format string determines the byte order, size and alignment, as follows: First character Byte order size and alignment '@' native native '=' native standard '<' little-endian standard '>' big-endian standard '!' network (= big-endian) standard If the first character is not one of these, '@' is assumed. Native byte order is big-endian or little-endian, depending on the host system (e.g. Motorola and Sun are big-endian; Intel and DEC are little-endian). Native size and alignment are determined using the C compiler's sizeof expression. This is always combined with native byte order. Standard size and alignment are as follows: no alignment is required for any type (so you have to use pad bytes); short is 2 bytes; int and long are 4 bytes. In this mode, there is no support for float and double. Note the difference between '@' and '=': both use native byte order, but the size and alignment of the latter is standardized. The form '!' is available for those poor souls who can't remember whether network byte order is big-endian or little-endian. There is no way to indicate non-native byte order (i.e. force byte-swapping); use the appropriate choice of '<' or '>'.
1996-12-30 21:41:25 -04:00
calcsize(fmt, f)
const char *fmt;
const formatdef *f;
{
Pretty much rewritten to fulfull several long-standing wishes: -- The whole implementation is now more table-driven. -- Unsigned integers. Format characters 'B', 'H', 'I' and 'L' mean unsigned byte, short, int and long. For 'I' and 'L', the return value is a Python long integer if a Python plain integer can't represent the required range (note: this is dependent on the size of the relevant C types only, not of the sign of the actual value). -- A new format character 's' packs/unpacks a string. When given a count prefix, this is the size of the string, not a repeat count like for the other format characters; e.g. '10s' means a single 10-byte string, while '10c' means 10 characters. For packing, the string is truncated or padded with null bytes as appropriate to make it fit. For unpacking, the resulting string always has exactly the specified number of bytes. As a special case, '0s' means a single, empty string (while '0c' means 0 characters). -- Various byte order options. The first character of the format string determines the byte order, size and alignment, as follows: First character Byte order size and alignment '@' native native '=' native standard '<' little-endian standard '>' big-endian standard '!' network (= big-endian) standard If the first character is not one of these, '@' is assumed. Native byte order is big-endian or little-endian, depending on the host system (e.g. Motorola and Sun are big-endian; Intel and DEC are little-endian). Native size and alignment are determined using the C compiler's sizeof expression. This is always combined with native byte order. Standard size and alignment are as follows: no alignment is required for any type (so you have to use pad bytes); short is 2 bytes; int and long are 4 bytes. In this mode, there is no support for float and double. Note the difference between '@' and '=': both use native byte order, but the size and alignment of the latter is standardized. The form '!' is available for those poor souls who can't remember whether network byte order is big-endian or little-endian. There is no way to indicate non-native byte order (i.e. force byte-swapping); use the appropriate choice of '<' or '>'.
1996-12-30 21:41:25 -04:00
const formatdef *e;
const char *s;
char c;
int size, num, itemsize, x;
s = fmt;
size = 0;
while ((c = *s++) != '\0') {
if (isspace(c))
continue;
if ('0' <= c && c <= '9') {
num = c - '0';
while ('0' <= (c = *s++) && c <= '9') {
x = num*10 + (c - '0');
if (x/10 != num) {
Pretty much rewritten to fulfull several long-standing wishes: -- The whole implementation is now more table-driven. -- Unsigned integers. Format characters 'B', 'H', 'I' and 'L' mean unsigned byte, short, int and long. For 'I' and 'L', the return value is a Python long integer if a Python plain integer can't represent the required range (note: this is dependent on the size of the relevant C types only, not of the sign of the actual value). -- A new format character 's' packs/unpacks a string. When given a count prefix, this is the size of the string, not a repeat count like for the other format characters; e.g. '10s' means a single 10-byte string, while '10c' means 10 characters. For packing, the string is truncated or padded with null bytes as appropriate to make it fit. For unpacking, the resulting string always has exactly the specified number of bytes. As a special case, '0s' means a single, empty string (while '0c' means 0 characters). -- Various byte order options. The first character of the format string determines the byte order, size and alignment, as follows: First character Byte order size and alignment '@' native native '=' native standard '<' little-endian standard '>' big-endian standard '!' network (= big-endian) standard If the first character is not one of these, '@' is assumed. Native byte order is big-endian or little-endian, depending on the host system (e.g. Motorola and Sun are big-endian; Intel and DEC are little-endian). Native size and alignment are determined using the C compiler's sizeof expression. This is always combined with native byte order. Standard size and alignment are as follows: no alignment is required for any type (so you have to use pad bytes); short is 2 bytes; int and long are 4 bytes. In this mode, there is no support for float and double. Note the difference between '@' and '=': both use native byte order, but the size and alignment of the latter is standardized. The form '!' is available for those poor souls who can't remember whether network byte order is big-endian or little-endian. There is no way to indicate non-native byte order (i.e. force byte-swapping); use the appropriate choice of '<' or '>'.
1996-12-30 21:41:25 -04:00
PyErr_SetString(
StructError,
"overflow in item count");
return -1;
}
num = x;
}
if (c == '\0')
break;
}
else
num = 1;
Pretty much rewritten to fulfull several long-standing wishes: -- The whole implementation is now more table-driven. -- Unsigned integers. Format characters 'B', 'H', 'I' and 'L' mean unsigned byte, short, int and long. For 'I' and 'L', the return value is a Python long integer if a Python plain integer can't represent the required range (note: this is dependent on the size of the relevant C types only, not of the sign of the actual value). -- A new format character 's' packs/unpacks a string. When given a count prefix, this is the size of the string, not a repeat count like for the other format characters; e.g. '10s' means a single 10-byte string, while '10c' means 10 characters. For packing, the string is truncated or padded with null bytes as appropriate to make it fit. For unpacking, the resulting string always has exactly the specified number of bytes. As a special case, '0s' means a single, empty string (while '0c' means 0 characters). -- Various byte order options. The first character of the format string determines the byte order, size and alignment, as follows: First character Byte order size and alignment '@' native native '=' native standard '<' little-endian standard '>' big-endian standard '!' network (= big-endian) standard If the first character is not one of these, '@' is assumed. Native byte order is big-endian or little-endian, depending on the host system (e.g. Motorola and Sun are big-endian; Intel and DEC are little-endian). Native size and alignment are determined using the C compiler's sizeof expression. This is always combined with native byte order. Standard size and alignment are as follows: no alignment is required for any type (so you have to use pad bytes); short is 2 bytes; int and long are 4 bytes. In this mode, there is no support for float and double. Note the difference between '@' and '=': both use native byte order, but the size and alignment of the latter is standardized. The form '!' is available for those poor souls who can't remember whether network byte order is big-endian or little-endian. There is no way to indicate non-native byte order (i.e. force byte-swapping); use the appropriate choice of '<' or '>'.
1996-12-30 21:41:25 -04:00
e = getentry(c, f);
if (e == NULL)
return -1;
Pretty much rewritten to fulfull several long-standing wishes: -- The whole implementation is now more table-driven. -- Unsigned integers. Format characters 'B', 'H', 'I' and 'L' mean unsigned byte, short, int and long. For 'I' and 'L', the return value is a Python long integer if a Python plain integer can't represent the required range (note: this is dependent on the size of the relevant C types only, not of the sign of the actual value). -- A new format character 's' packs/unpacks a string. When given a count prefix, this is the size of the string, not a repeat count like for the other format characters; e.g. '10s' means a single 10-byte string, while '10c' means 10 characters. For packing, the string is truncated or padded with null bytes as appropriate to make it fit. For unpacking, the resulting string always has exactly the specified number of bytes. As a special case, '0s' means a single, empty string (while '0c' means 0 characters). -- Various byte order options. The first character of the format string determines the byte order, size and alignment, as follows: First character Byte order size and alignment '@' native native '=' native standard '<' little-endian standard '>' big-endian standard '!' network (= big-endian) standard If the first character is not one of these, '@' is assumed. Native byte order is big-endian or little-endian, depending on the host system (e.g. Motorola and Sun are big-endian; Intel and DEC are little-endian). Native size and alignment are determined using the C compiler's sizeof expression. This is always combined with native byte order. Standard size and alignment are as follows: no alignment is required for any type (so you have to use pad bytes); short is 2 bytes; int and long are 4 bytes. In this mode, there is no support for float and double. Note the difference between '@' and '=': both use native byte order, but the size and alignment of the latter is standardized. The form '!' is available for those poor souls who can't remember whether network byte order is big-endian or little-endian. There is no way to indicate non-native byte order (i.e. force byte-swapping); use the appropriate choice of '<' or '>'.
1996-12-30 21:41:25 -04:00
itemsize = e->size;
size = align(size, c, e);
x = num * itemsize;
size += x;
if (x/itemsize != num || size < 0) {
1996-12-12 19:32:31 -04:00
PyErr_SetString(StructError,
"total struct size too long");
return -1;
}
}
return size;
}
/* pack(fmt, v1, v2, ...) --> string */
1996-12-12 19:32:31 -04:00
static PyObject *
struct_calcsize(self, args)
1996-12-12 19:32:31 -04:00
PyObject *self; /* Not used */
PyObject *args;
{
char *fmt;
Pretty much rewritten to fulfull several long-standing wishes: -- The whole implementation is now more table-driven. -- Unsigned integers. Format characters 'B', 'H', 'I' and 'L' mean unsigned byte, short, int and long. For 'I' and 'L', the return value is a Python long integer if a Python plain integer can't represent the required range (note: this is dependent on the size of the relevant C types only, not of the sign of the actual value). -- A new format character 's' packs/unpacks a string. When given a count prefix, this is the size of the string, not a repeat count like for the other format characters; e.g. '10s' means a single 10-byte string, while '10c' means 10 characters. For packing, the string is truncated or padded with null bytes as appropriate to make it fit. For unpacking, the resulting string always has exactly the specified number of bytes. As a special case, '0s' means a single, empty string (while '0c' means 0 characters). -- Various byte order options. The first character of the format string determines the byte order, size and alignment, as follows: First character Byte order size and alignment '@' native native '=' native standard '<' little-endian standard '>' big-endian standard '!' network (= big-endian) standard If the first character is not one of these, '@' is assumed. Native byte order is big-endian or little-endian, depending on the host system (e.g. Motorola and Sun are big-endian; Intel and DEC are little-endian). Native size and alignment are determined using the C compiler's sizeof expression. This is always combined with native byte order. Standard size and alignment are as follows: no alignment is required for any type (so you have to use pad bytes); short is 2 bytes; int and long are 4 bytes. In this mode, there is no support for float and double. Note the difference between '@' and '=': both use native byte order, but the size and alignment of the latter is standardized. The form '!' is available for those poor souls who can't remember whether network byte order is big-endian or little-endian. There is no way to indicate non-native byte order (i.e. force byte-swapping); use the appropriate choice of '<' or '>'.
1996-12-30 21:41:25 -04:00
const formatdef *f;
int size;
Pretty much rewritten to fulfull several long-standing wishes: -- The whole implementation is now more table-driven. -- Unsigned integers. Format characters 'B', 'H', 'I' and 'L' mean unsigned byte, short, int and long. For 'I' and 'L', the return value is a Python long integer if a Python plain integer can't represent the required range (note: this is dependent on the size of the relevant C types only, not of the sign of the actual value). -- A new format character 's' packs/unpacks a string. When given a count prefix, this is the size of the string, not a repeat count like for the other format characters; e.g. '10s' means a single 10-byte string, while '10c' means 10 characters. For packing, the string is truncated or padded with null bytes as appropriate to make it fit. For unpacking, the resulting string always has exactly the specified number of bytes. As a special case, '0s' means a single, empty string (while '0c' means 0 characters). -- Various byte order options. The first character of the format string determines the byte order, size and alignment, as follows: First character Byte order size and alignment '@' native native '=' native standard '<' little-endian standard '>' big-endian standard '!' network (= big-endian) standard If the first character is not one of these, '@' is assumed. Native byte order is big-endian or little-endian, depending on the host system (e.g. Motorola and Sun are big-endian; Intel and DEC are little-endian). Native size and alignment are determined using the C compiler's sizeof expression. This is always combined with native byte order. Standard size and alignment are as follows: no alignment is required for any type (so you have to use pad bytes); short is 2 bytes; int and long are 4 bytes. In this mode, there is no support for float and double. Note the difference between '@' and '=': both use native byte order, but the size and alignment of the latter is standardized. The form '!' is available for those poor souls who can't remember whether network byte order is big-endian or little-endian. There is no way to indicate non-native byte order (i.e. force byte-swapping); use the appropriate choice of '<' or '>'.
1996-12-30 21:41:25 -04:00
if (!PyArg_ParseTuple(args, "s", &fmt))
return NULL;
Pretty much rewritten to fulfull several long-standing wishes: -- The whole implementation is now more table-driven. -- Unsigned integers. Format characters 'B', 'H', 'I' and 'L' mean unsigned byte, short, int and long. For 'I' and 'L', the return value is a Python long integer if a Python plain integer can't represent the required range (note: this is dependent on the size of the relevant C types only, not of the sign of the actual value). -- A new format character 's' packs/unpacks a string. When given a count prefix, this is the size of the string, not a repeat count like for the other format characters; e.g. '10s' means a single 10-byte string, while '10c' means 10 characters. For packing, the string is truncated or padded with null bytes as appropriate to make it fit. For unpacking, the resulting string always has exactly the specified number of bytes. As a special case, '0s' means a single, empty string (while '0c' means 0 characters). -- Various byte order options. The first character of the format string determines the byte order, size and alignment, as follows: First character Byte order size and alignment '@' native native '=' native standard '<' little-endian standard '>' big-endian standard '!' network (= big-endian) standard If the first character is not one of these, '@' is assumed. Native byte order is big-endian or little-endian, depending on the host system (e.g. Motorola and Sun are big-endian; Intel and DEC are little-endian). Native size and alignment are determined using the C compiler's sizeof expression. This is always combined with native byte order. Standard size and alignment are as follows: no alignment is required for any type (so you have to use pad bytes); short is 2 bytes; int and long are 4 bytes. In this mode, there is no support for float and double. Note the difference between '@' and '=': both use native byte order, but the size and alignment of the latter is standardized. The form '!' is available for those poor souls who can't remember whether network byte order is big-endian or little-endian. There is no way to indicate non-native byte order (i.e. force byte-swapping); use the appropriate choice of '<' or '>'.
1996-12-30 21:41:25 -04:00
f = whichtable(&fmt);
size = calcsize(fmt, f);
if (size < 0)
return NULL;
1996-12-12 19:32:31 -04:00
return PyInt_FromLong((long)size);
}
/* pack(fmt, v1, v2, ...) --> string */
1996-12-12 19:32:31 -04:00
static PyObject *
struct_pack(self, args)
1996-12-12 19:32:31 -04:00
PyObject *self; /* Not used */
PyObject *args;
{
Pretty much rewritten to fulfull several long-standing wishes: -- The whole implementation is now more table-driven. -- Unsigned integers. Format characters 'B', 'H', 'I' and 'L' mean unsigned byte, short, int and long. For 'I' and 'L', the return value is a Python long integer if a Python plain integer can't represent the required range (note: this is dependent on the size of the relevant C types only, not of the sign of the actual value). -- A new format character 's' packs/unpacks a string. When given a count prefix, this is the size of the string, not a repeat count like for the other format characters; e.g. '10s' means a single 10-byte string, while '10c' means 10 characters. For packing, the string is truncated or padded with null bytes as appropriate to make it fit. For unpacking, the resulting string always has exactly the specified number of bytes. As a special case, '0s' means a single, empty string (while '0c' means 0 characters). -- Various byte order options. The first character of the format string determines the byte order, size and alignment, as follows: First character Byte order size and alignment '@' native native '=' native standard '<' little-endian standard '>' big-endian standard '!' network (= big-endian) standard If the first character is not one of these, '@' is assumed. Native byte order is big-endian or little-endian, depending on the host system (e.g. Motorola and Sun are big-endian; Intel and DEC are little-endian). Native size and alignment are determined using the C compiler's sizeof expression. This is always combined with native byte order. Standard size and alignment are as follows: no alignment is required for any type (so you have to use pad bytes); short is 2 bytes; int and long are 4 bytes. In this mode, there is no support for float and double. Note the difference between '@' and '=': both use native byte order, but the size and alignment of the latter is standardized. The form '!' is available for those poor souls who can't remember whether network byte order is big-endian or little-endian. There is no way to indicate non-native byte order (i.e. force byte-swapping); use the appropriate choice of '<' or '>'.
1996-12-30 21:41:25 -04:00
const formatdef *f, *e;
1996-12-12 19:32:31 -04:00
PyObject *format, *result, *v;
char *fmt;
int size, num;
int i, n;
char *s, *res, *restart, *nres;
char c;
1996-12-12 19:32:31 -04:00
if (args == NULL || !PyTuple_Check(args) ||
(n = PyTuple_Size(args)) < 1)
{
PyErr_BadArgument();
return NULL;
}
1996-12-12 19:32:31 -04:00
format = PyTuple_GetItem(args, 0);
if (!PyArg_Parse(format, "s", &fmt))
return NULL;
Pretty much rewritten to fulfull several long-standing wishes: -- The whole implementation is now more table-driven. -- Unsigned integers. Format characters 'B', 'H', 'I' and 'L' mean unsigned byte, short, int and long. For 'I' and 'L', the return value is a Python long integer if a Python plain integer can't represent the required range (note: this is dependent on the size of the relevant C types only, not of the sign of the actual value). -- A new format character 's' packs/unpacks a string. When given a count prefix, this is the size of the string, not a repeat count like for the other format characters; e.g. '10s' means a single 10-byte string, while '10c' means 10 characters. For packing, the string is truncated or padded with null bytes as appropriate to make it fit. For unpacking, the resulting string always has exactly the specified number of bytes. As a special case, '0s' means a single, empty string (while '0c' means 0 characters). -- Various byte order options. The first character of the format string determines the byte order, size and alignment, as follows: First character Byte order size and alignment '@' native native '=' native standard '<' little-endian standard '>' big-endian standard '!' network (= big-endian) standard If the first character is not one of these, '@' is assumed. Native byte order is big-endian or little-endian, depending on the host system (e.g. Motorola and Sun are big-endian; Intel and DEC are little-endian). Native size and alignment are determined using the C compiler's sizeof expression. This is always combined with native byte order. Standard size and alignment are as follows: no alignment is required for any type (so you have to use pad bytes); short is 2 bytes; int and long are 4 bytes. In this mode, there is no support for float and double. Note the difference between '@' and '=': both use native byte order, but the size and alignment of the latter is standardized. The form '!' is available for those poor souls who can't remember whether network byte order is big-endian or little-endian. There is no way to indicate non-native byte order (i.e. force byte-swapping); use the appropriate choice of '<' or '>'.
1996-12-30 21:41:25 -04:00
f = whichtable(&fmt);
size = calcsize(fmt, f);
if (size < 0)
return NULL;
1996-12-12 19:32:31 -04:00
result = PyString_FromStringAndSize((char *)NULL, size);
if (result == NULL)
return NULL;
s = fmt;
i = 1;
1996-12-12 19:32:31 -04:00
res = restart = PyString_AsString(result);
while ((c = *s++) != '\0') {
if (isspace(c))
continue;
if ('0' <= c && c <= '9') {
num = c - '0';
while ('0' <= (c = *s++) && c <= '9')
num = num*10 + (c - '0');
if (c == '\0')
break;
}
else
num = 1;
Pretty much rewritten to fulfull several long-standing wishes: -- The whole implementation is now more table-driven. -- Unsigned integers. Format characters 'B', 'H', 'I' and 'L' mean unsigned byte, short, int and long. For 'I' and 'L', the return value is a Python long integer if a Python plain integer can't represent the required range (note: this is dependent on the size of the relevant C types only, not of the sign of the actual value). -- A new format character 's' packs/unpacks a string. When given a count prefix, this is the size of the string, not a repeat count like for the other format characters; e.g. '10s' means a single 10-byte string, while '10c' means 10 characters. For packing, the string is truncated or padded with null bytes as appropriate to make it fit. For unpacking, the resulting string always has exactly the specified number of bytes. As a special case, '0s' means a single, empty string (while '0c' means 0 characters). -- Various byte order options. The first character of the format string determines the byte order, size and alignment, as follows: First character Byte order size and alignment '@' native native '=' native standard '<' little-endian standard '>' big-endian standard '!' network (= big-endian) standard If the first character is not one of these, '@' is assumed. Native byte order is big-endian or little-endian, depending on the host system (e.g. Motorola and Sun are big-endian; Intel and DEC are little-endian). Native size and alignment are determined using the C compiler's sizeof expression. This is always combined with native byte order. Standard size and alignment are as follows: no alignment is required for any type (so you have to use pad bytes); short is 2 bytes; int and long are 4 bytes. In this mode, there is no support for float and double. Note the difference between '@' and '=': both use native byte order, but the size and alignment of the latter is standardized. The form '!' is available for those poor souls who can't remember whether network byte order is big-endian or little-endian. There is no way to indicate non-native byte order (i.e. force byte-swapping); use the appropriate choice of '<' or '>'.
1996-12-30 21:41:25 -04:00
e = getentry(c, f);
if (e == NULL)
goto fail;
nres = restart + align((int)(res-restart), c, e);
/* Fill padd bytes with zeros */
while (res < nres)
*res++ = '\0';
if (num == 0 && c != 's')
continue;
Pretty much rewritten to fulfull several long-standing wishes: -- The whole implementation is now more table-driven. -- Unsigned integers. Format characters 'B', 'H', 'I' and 'L' mean unsigned byte, short, int and long. For 'I' and 'L', the return value is a Python long integer if a Python plain integer can't represent the required range (note: this is dependent on the size of the relevant C types only, not of the sign of the actual value). -- A new format character 's' packs/unpacks a string. When given a count prefix, this is the size of the string, not a repeat count like for the other format characters; e.g. '10s' means a single 10-byte string, while '10c' means 10 characters. For packing, the string is truncated or padded with null bytes as appropriate to make it fit. For unpacking, the resulting string always has exactly the specified number of bytes. As a special case, '0s' means a single, empty string (while '0c' means 0 characters). -- Various byte order options. The first character of the format string determines the byte order, size and alignment, as follows: First character Byte order size and alignment '@' native native '=' native standard '<' little-endian standard '>' big-endian standard '!' network (= big-endian) standard If the first character is not one of these, '@' is assumed. Native byte order is big-endian or little-endian, depending on the host system (e.g. Motorola and Sun are big-endian; Intel and DEC are little-endian). Native size and alignment are determined using the C compiler's sizeof expression. This is always combined with native byte order. Standard size and alignment are as follows: no alignment is required for any type (so you have to use pad bytes); short is 2 bytes; int and long are 4 bytes. In this mode, there is no support for float and double. Note the difference between '@' and '=': both use native byte order, but the size and alignment of the latter is standardized. The form '!' is available for those poor souls who can't remember whether network byte order is big-endian or little-endian. There is no way to indicate non-native byte order (i.e. force byte-swapping); use the appropriate choice of '<' or '>'.
1996-12-30 21:41:25 -04:00
do {
if (c == 'x') {
/* doesn't consume arguments */
memset(res, '\0', num);
Pretty much rewritten to fulfull several long-standing wishes: -- The whole implementation is now more table-driven. -- Unsigned integers. Format characters 'B', 'H', 'I' and 'L' mean unsigned byte, short, int and long. For 'I' and 'L', the return value is a Python long integer if a Python plain integer can't represent the required range (note: this is dependent on the size of the relevant C types only, not of the sign of the actual value). -- A new format character 's' packs/unpacks a string. When given a count prefix, this is the size of the string, not a repeat count like for the other format characters; e.g. '10s' means a single 10-byte string, while '10c' means 10 characters. For packing, the string is truncated or padded with null bytes as appropriate to make it fit. For unpacking, the resulting string always has exactly the specified number of bytes. As a special case, '0s' means a single, empty string (while '0c' means 0 characters). -- Various byte order options. The first character of the format string determines the byte order, size and alignment, as follows: First character Byte order size and alignment '@' native native '=' native standard '<' little-endian standard '>' big-endian standard '!' network (= big-endian) standard If the first character is not one of these, '@' is assumed. Native byte order is big-endian or little-endian, depending on the host system (e.g. Motorola and Sun are big-endian; Intel and DEC are little-endian). Native size and alignment are determined using the C compiler's sizeof expression. This is always combined with native byte order. Standard size and alignment are as follows: no alignment is required for any type (so you have to use pad bytes); short is 2 bytes; int and long are 4 bytes. In this mode, there is no support for float and double. Note the difference between '@' and '=': both use native byte order, but the size and alignment of the latter is standardized. The form '!' is available for those poor souls who can't remember whether network byte order is big-endian or little-endian. There is no way to indicate non-native byte order (i.e. force byte-swapping); use the appropriate choice of '<' or '>'.
1996-12-30 21:41:25 -04:00
res += num;
break;
Pretty much rewritten to fulfull several long-standing wishes: -- The whole implementation is now more table-driven. -- Unsigned integers. Format characters 'B', 'H', 'I' and 'L' mean unsigned byte, short, int and long. For 'I' and 'L', the return value is a Python long integer if a Python plain integer can't represent the required range (note: this is dependent on the size of the relevant C types only, not of the sign of the actual value). -- A new format character 's' packs/unpacks a string. When given a count prefix, this is the size of the string, not a repeat count like for the other format characters; e.g. '10s' means a single 10-byte string, while '10c' means 10 characters. For packing, the string is truncated or padded with null bytes as appropriate to make it fit. For unpacking, the resulting string always has exactly the specified number of bytes. As a special case, '0s' means a single, empty string (while '0c' means 0 characters). -- Various byte order options. The first character of the format string determines the byte order, size and alignment, as follows: First character Byte order size and alignment '@' native native '=' native standard '<' little-endian standard '>' big-endian standard '!' network (= big-endian) standard If the first character is not one of these, '@' is assumed. Native byte order is big-endian or little-endian, depending on the host system (e.g. Motorola and Sun are big-endian; Intel and DEC are little-endian). Native size and alignment are determined using the C compiler's sizeof expression. This is always combined with native byte order. Standard size and alignment are as follows: no alignment is required for any type (so you have to use pad bytes); short is 2 bytes; int and long are 4 bytes. In this mode, there is no support for float and double. Note the difference between '@' and '=': both use native byte order, but the size and alignment of the latter is standardized. The form '!' is available for those poor souls who can't remember whether network byte order is big-endian or little-endian. There is no way to indicate non-native byte order (i.e. force byte-swapping); use the appropriate choice of '<' or '>'.
1996-12-30 21:41:25 -04:00
}
if (i >= n) {
PyErr_SetString(StructError,
"insufficient arguments to pack");
goto fail;
}
Pretty much rewritten to fulfull several long-standing wishes: -- The whole implementation is now more table-driven. -- Unsigned integers. Format characters 'B', 'H', 'I' and 'L' mean unsigned byte, short, int and long. For 'I' and 'L', the return value is a Python long integer if a Python plain integer can't represent the required range (note: this is dependent on the size of the relevant C types only, not of the sign of the actual value). -- A new format character 's' packs/unpacks a string. When given a count prefix, this is the size of the string, not a repeat count like for the other format characters; e.g. '10s' means a single 10-byte string, while '10c' means 10 characters. For packing, the string is truncated or padded with null bytes as appropriate to make it fit. For unpacking, the resulting string always has exactly the specified number of bytes. As a special case, '0s' means a single, empty string (while '0c' means 0 characters). -- Various byte order options. The first character of the format string determines the byte order, size and alignment, as follows: First character Byte order size and alignment '@' native native '=' native standard '<' little-endian standard '>' big-endian standard '!' network (= big-endian) standard If the first character is not one of these, '@' is assumed. Native byte order is big-endian or little-endian, depending on the host system (e.g. Motorola and Sun are big-endian; Intel and DEC are little-endian). Native size and alignment are determined using the C compiler's sizeof expression. This is always combined with native byte order. Standard size and alignment are as follows: no alignment is required for any type (so you have to use pad bytes); short is 2 bytes; int and long are 4 bytes. In this mode, there is no support for float and double. Note the difference between '@' and '=': both use native byte order, but the size and alignment of the latter is standardized. The form '!' is available for those poor souls who can't remember whether network byte order is big-endian or little-endian. There is no way to indicate non-native byte order (i.e. force byte-swapping); use the appropriate choice of '<' or '>'.
1996-12-30 21:41:25 -04:00
v = PyTuple_GetItem(args, i++);
if (v == NULL)
goto fail;
if (c == 's') {
/* num is string size, not repeat count */
int n;
if (!PyString_Check(v)) {
1996-12-12 19:32:31 -04:00
PyErr_SetString(StructError,
Pretty much rewritten to fulfull several long-standing wishes: -- The whole implementation is now more table-driven. -- Unsigned integers. Format characters 'B', 'H', 'I' and 'L' mean unsigned byte, short, int and long. For 'I' and 'L', the return value is a Python long integer if a Python plain integer can't represent the required range (note: this is dependent on the size of the relevant C types only, not of the sign of the actual value). -- A new format character 's' packs/unpacks a string. When given a count prefix, this is the size of the string, not a repeat count like for the other format characters; e.g. '10s' means a single 10-byte string, while '10c' means 10 characters. For packing, the string is truncated or padded with null bytes as appropriate to make it fit. For unpacking, the resulting string always has exactly the specified number of bytes. As a special case, '0s' means a single, empty string (while '0c' means 0 characters). -- Various byte order options. The first character of the format string determines the byte order, size and alignment, as follows: First character Byte order size and alignment '@' native native '=' native standard '<' little-endian standard '>' big-endian standard '!' network (= big-endian) standard If the first character is not one of these, '@' is assumed. Native byte order is big-endian or little-endian, depending on the host system (e.g. Motorola and Sun are big-endian; Intel and DEC are little-endian). Native size and alignment are determined using the C compiler's sizeof expression. This is always combined with native byte order. Standard size and alignment are as follows: no alignment is required for any type (so you have to use pad bytes); short is 2 bytes; int and long are 4 bytes. In this mode, there is no support for float and double. Note the difference between '@' and '=': both use native byte order, but the size and alignment of the latter is standardized. The form '!' is available for those poor souls who can't remember whether network byte order is big-endian or little-endian. There is no way to indicate non-native byte order (i.e. force byte-swapping); use the appropriate choice of '<' or '>'.
1996-12-30 21:41:25 -04:00
"argument for 's' must be a string");
goto fail;
}
Pretty much rewritten to fulfull several long-standing wishes: -- The whole implementation is now more table-driven. -- Unsigned integers. Format characters 'B', 'H', 'I' and 'L' mean unsigned byte, short, int and long. For 'I' and 'L', the return value is a Python long integer if a Python plain integer can't represent the required range (note: this is dependent on the size of the relevant C types only, not of the sign of the actual value). -- A new format character 's' packs/unpacks a string. When given a count prefix, this is the size of the string, not a repeat count like for the other format characters; e.g. '10s' means a single 10-byte string, while '10c' means 10 characters. For packing, the string is truncated or padded with null bytes as appropriate to make it fit. For unpacking, the resulting string always has exactly the specified number of bytes. As a special case, '0s' means a single, empty string (while '0c' means 0 characters). -- Various byte order options. The first character of the format string determines the byte order, size and alignment, as follows: First character Byte order size and alignment '@' native native '=' native standard '<' little-endian standard '>' big-endian standard '!' network (= big-endian) standard If the first character is not one of these, '@' is assumed. Native byte order is big-endian or little-endian, depending on the host system (e.g. Motorola and Sun are big-endian; Intel and DEC are little-endian). Native size and alignment are determined using the C compiler's sizeof expression. This is always combined with native byte order. Standard size and alignment are as follows: no alignment is required for any type (so you have to use pad bytes); short is 2 bytes; int and long are 4 bytes. In this mode, there is no support for float and double. Note the difference between '@' and '=': both use native byte order, but the size and alignment of the latter is standardized. The form '!' is available for those poor souls who can't remember whether network byte order is big-endian or little-endian. There is no way to indicate non-native byte order (i.e. force byte-swapping); use the appropriate choice of '<' or '>'.
1996-12-30 21:41:25 -04:00
n = PyString_Size(v);
if (n > num)
n = num;
if (n > 0)
memcpy(res, PyString_AsString(v), n);
if (n < num)
memset(res+n, '\0', num-n);
Pretty much rewritten to fulfull several long-standing wishes: -- The whole implementation is now more table-driven. -- Unsigned integers. Format characters 'B', 'H', 'I' and 'L' mean unsigned byte, short, int and long. For 'I' and 'L', the return value is a Python long integer if a Python plain integer can't represent the required range (note: this is dependent on the size of the relevant C types only, not of the sign of the actual value). -- A new format character 's' packs/unpacks a string. When given a count prefix, this is the size of the string, not a repeat count like for the other format characters; e.g. '10s' means a single 10-byte string, while '10c' means 10 characters. For packing, the string is truncated or padded with null bytes as appropriate to make it fit. For unpacking, the resulting string always has exactly the specified number of bytes. As a special case, '0s' means a single, empty string (while '0c' means 0 characters). -- Various byte order options. The first character of the format string determines the byte order, size and alignment, as follows: First character Byte order size and alignment '@' native native '=' native standard '<' little-endian standard '>' big-endian standard '!' network (= big-endian) standard If the first character is not one of these, '@' is assumed. Native byte order is big-endian or little-endian, depending on the host system (e.g. Motorola and Sun are big-endian; Intel and DEC are little-endian). Native size and alignment are determined using the C compiler's sizeof expression. This is always combined with native byte order. Standard size and alignment are as follows: no alignment is required for any type (so you have to use pad bytes); short is 2 bytes; int and long are 4 bytes. In this mode, there is no support for float and double. Note the difference between '@' and '=': both use native byte order, but the size and alignment of the latter is standardized. The form '!' is available for those poor souls who can't remember whether network byte order is big-endian or little-endian. There is no way to indicate non-native byte order (i.e. force byte-swapping); use the appropriate choice of '<' or '>'.
1996-12-30 21:41:25 -04:00
res += num;
break;
Pretty much rewritten to fulfull several long-standing wishes: -- The whole implementation is now more table-driven. -- Unsigned integers. Format characters 'B', 'H', 'I' and 'L' mean unsigned byte, short, int and long. For 'I' and 'L', the return value is a Python long integer if a Python plain integer can't represent the required range (note: this is dependent on the size of the relevant C types only, not of the sign of the actual value). -- A new format character 's' packs/unpacks a string. When given a count prefix, this is the size of the string, not a repeat count like for the other format characters; e.g. '10s' means a single 10-byte string, while '10c' means 10 characters. For packing, the string is truncated or padded with null bytes as appropriate to make it fit. For unpacking, the resulting string always has exactly the specified number of bytes. As a special case, '0s' means a single, empty string (while '0c' means 0 characters). -- Various byte order options. The first character of the format string determines the byte order, size and alignment, as follows: First character Byte order size and alignment '@' native native '=' native standard '<' little-endian standard '>' big-endian standard '!' network (= big-endian) standard If the first character is not one of these, '@' is assumed. Native byte order is big-endian or little-endian, depending on the host system (e.g. Motorola and Sun are big-endian; Intel and DEC are little-endian). Native size and alignment are determined using the C compiler's sizeof expression. This is always combined with native byte order. Standard size and alignment are as follows: no alignment is required for any type (so you have to use pad bytes); short is 2 bytes; int and long are 4 bytes. In this mode, there is no support for float and double. Note the difference between '@' and '=': both use native byte order, but the size and alignment of the latter is standardized. The form '!' is available for those poor souls who can't remember whether network byte order is big-endian or little-endian. There is no way to indicate non-native byte order (i.e. force byte-swapping); use the appropriate choice of '<' or '>'.
1996-12-30 21:41:25 -04:00
}
else if (c == 'p') {
/* num is string size + 1,
to fit in the count byte */
int n;
num--; /* now num is max string size */
if (!PyString_Check(v)) {
PyErr_SetString(StructError,
"argument for 'p' must be a string");
goto fail;
}
n = PyString_Size(v);
if (n > num)
n = num;
if (n > 0)
memcpy(res+1, PyString_AsString(v), n);
if (n < num)
/* no real need, just to be nice */
memset(res+1+n, '\0', num-n);
*res++ = n; /* store the length byte */
res += num;
break;
}
Pretty much rewritten to fulfull several long-standing wishes: -- The whole implementation is now more table-driven. -- Unsigned integers. Format characters 'B', 'H', 'I' and 'L' mean unsigned byte, short, int and long. For 'I' and 'L', the return value is a Python long integer if a Python plain integer can't represent the required range (note: this is dependent on the size of the relevant C types only, not of the sign of the actual value). -- A new format character 's' packs/unpacks a string. When given a count prefix, this is the size of the string, not a repeat count like for the other format characters; e.g. '10s' means a single 10-byte string, while '10c' means 10 characters. For packing, the string is truncated or padded with null bytes as appropriate to make it fit. For unpacking, the resulting string always has exactly the specified number of bytes. As a special case, '0s' means a single, empty string (while '0c' means 0 characters). -- Various byte order options. The first character of the format string determines the byte order, size and alignment, as follows: First character Byte order size and alignment '@' native native '=' native standard '<' little-endian standard '>' big-endian standard '!' network (= big-endian) standard If the first character is not one of these, '@' is assumed. Native byte order is big-endian or little-endian, depending on the host system (e.g. Motorola and Sun are big-endian; Intel and DEC are little-endian). Native size and alignment are determined using the C compiler's sizeof expression. This is always combined with native byte order. Standard size and alignment are as follows: no alignment is required for any type (so you have to use pad bytes); short is 2 bytes; int and long are 4 bytes. In this mode, there is no support for float and double. Note the difference between '@' and '=': both use native byte order, but the size and alignment of the latter is standardized. The form '!' is available for those poor souls who can't remember whether network byte order is big-endian or little-endian. There is no way to indicate non-native byte order (i.e. force byte-swapping); use the appropriate choice of '<' or '>'.
1996-12-30 21:41:25 -04:00
else {
if (e->pack(res, v, e) < 0)
goto fail;
Pretty much rewritten to fulfull several long-standing wishes: -- The whole implementation is now more table-driven. -- Unsigned integers. Format characters 'B', 'H', 'I' and 'L' mean unsigned byte, short, int and long. For 'I' and 'L', the return value is a Python long integer if a Python plain integer can't represent the required range (note: this is dependent on the size of the relevant C types only, not of the sign of the actual value). -- A new format character 's' packs/unpacks a string. When given a count prefix, this is the size of the string, not a repeat count like for the other format characters; e.g. '10s' means a single 10-byte string, while '10c' means 10 characters. For packing, the string is truncated or padded with null bytes as appropriate to make it fit. For unpacking, the resulting string always has exactly the specified number of bytes. As a special case, '0s' means a single, empty string (while '0c' means 0 characters). -- Various byte order options. The first character of the format string determines the byte order, size and alignment, as follows: First character Byte order size and alignment '@' native native '=' native standard '<' little-endian standard '>' big-endian standard '!' network (= big-endian) standard If the first character is not one of these, '@' is assumed. Native byte order is big-endian or little-endian, depending on the host system (e.g. Motorola and Sun are big-endian; Intel and DEC are little-endian). Native size and alignment are determined using the C compiler's sizeof expression. This is always combined with native byte order. Standard size and alignment are as follows: no alignment is required for any type (so you have to use pad bytes); short is 2 bytes; int and long are 4 bytes. In this mode, there is no support for float and double. Note the difference between '@' and '=': both use native byte order, but the size and alignment of the latter is standardized. The form '!' is available for those poor souls who can't remember whether network byte order is big-endian or little-endian. There is no way to indicate non-native byte order (i.e. force byte-swapping); use the appropriate choice of '<' or '>'.
1996-12-30 21:41:25 -04:00
res += e->size;
}
Pretty much rewritten to fulfull several long-standing wishes: -- The whole implementation is now more table-driven. -- Unsigned integers. Format characters 'B', 'H', 'I' and 'L' mean unsigned byte, short, int and long. For 'I' and 'L', the return value is a Python long integer if a Python plain integer can't represent the required range (note: this is dependent on the size of the relevant C types only, not of the sign of the actual value). -- A new format character 's' packs/unpacks a string. When given a count prefix, this is the size of the string, not a repeat count like for the other format characters; e.g. '10s' means a single 10-byte string, while '10c' means 10 characters. For packing, the string is truncated or padded with null bytes as appropriate to make it fit. For unpacking, the resulting string always has exactly the specified number of bytes. As a special case, '0s' means a single, empty string (while '0c' means 0 characters). -- Various byte order options. The first character of the format string determines the byte order, size and alignment, as follows: First character Byte order size and alignment '@' native native '=' native standard '<' little-endian standard '>' big-endian standard '!' network (= big-endian) standard If the first character is not one of these, '@' is assumed. Native byte order is big-endian or little-endian, depending on the host system (e.g. Motorola and Sun are big-endian; Intel and DEC are little-endian). Native size and alignment are determined using the C compiler's sizeof expression. This is always combined with native byte order. Standard size and alignment are as follows: no alignment is required for any type (so you have to use pad bytes); short is 2 bytes; int and long are 4 bytes. In this mode, there is no support for float and double. Note the difference between '@' and '=': both use native byte order, but the size and alignment of the latter is standardized. The form '!' is available for those poor souls who can't remember whether network byte order is big-endian or little-endian. There is no way to indicate non-native byte order (i.e. force byte-swapping); use the appropriate choice of '<' or '>'.
1996-12-30 21:41:25 -04:00
} while (--num > 0);
}
if (i < n) {
1996-12-12 19:32:31 -04:00
PyErr_SetString(StructError,
Pretty much rewritten to fulfull several long-standing wishes: -- The whole implementation is now more table-driven. -- Unsigned integers. Format characters 'B', 'H', 'I' and 'L' mean unsigned byte, short, int and long. For 'I' and 'L', the return value is a Python long integer if a Python plain integer can't represent the required range (note: this is dependent on the size of the relevant C types only, not of the sign of the actual value). -- A new format character 's' packs/unpacks a string. When given a count prefix, this is the size of the string, not a repeat count like for the other format characters; e.g. '10s' means a single 10-byte string, while '10c' means 10 characters. For packing, the string is truncated or padded with null bytes as appropriate to make it fit. For unpacking, the resulting string always has exactly the specified number of bytes. As a special case, '0s' means a single, empty string (while '0c' means 0 characters). -- Various byte order options. The first character of the format string determines the byte order, size and alignment, as follows: First character Byte order size and alignment '@' native native '=' native standard '<' little-endian standard '>' big-endian standard '!' network (= big-endian) standard If the first character is not one of these, '@' is assumed. Native byte order is big-endian or little-endian, depending on the host system (e.g. Motorola and Sun are big-endian; Intel and DEC are little-endian). Native size and alignment are determined using the C compiler's sizeof expression. This is always combined with native byte order. Standard size and alignment are as follows: no alignment is required for any type (so you have to use pad bytes); short is 2 bytes; int and long are 4 bytes. In this mode, there is no support for float and double. Note the difference between '@' and '=': both use native byte order, but the size and alignment of the latter is standardized. The form '!' is available for those poor souls who can't remember whether network byte order is big-endian or little-endian. There is no way to indicate non-native byte order (i.e. force byte-swapping); use the appropriate choice of '<' or '>'.
1996-12-30 21:41:25 -04:00
"too many arguments for pack format");
goto fail;
}
return result;
fail:
1996-12-12 19:32:31 -04:00
Py_DECREF(result);
return NULL;
}
/* unpack(fmt, string) --> (v1, v2, ...) */
1996-12-12 19:32:31 -04:00
static PyObject *
struct_unpack(self, args)
1996-12-12 19:32:31 -04:00
PyObject *self; /* Not used */
PyObject *args;
{
Pretty much rewritten to fulfull several long-standing wishes: -- The whole implementation is now more table-driven. -- Unsigned integers. Format characters 'B', 'H', 'I' and 'L' mean unsigned byte, short, int and long. For 'I' and 'L', the return value is a Python long integer if a Python plain integer can't represent the required range (note: this is dependent on the size of the relevant C types only, not of the sign of the actual value). -- A new format character 's' packs/unpacks a string. When given a count prefix, this is the size of the string, not a repeat count like for the other format characters; e.g. '10s' means a single 10-byte string, while '10c' means 10 characters. For packing, the string is truncated or padded with null bytes as appropriate to make it fit. For unpacking, the resulting string always has exactly the specified number of bytes. As a special case, '0s' means a single, empty string (while '0c' means 0 characters). -- Various byte order options. The first character of the format string determines the byte order, size and alignment, as follows: First character Byte order size and alignment '@' native native '=' native standard '<' little-endian standard '>' big-endian standard '!' network (= big-endian) standard If the first character is not one of these, '@' is assumed. Native byte order is big-endian or little-endian, depending on the host system (e.g. Motorola and Sun are big-endian; Intel and DEC are little-endian). Native size and alignment are determined using the C compiler's sizeof expression. This is always combined with native byte order. Standard size and alignment are as follows: no alignment is required for any type (so you have to use pad bytes); short is 2 bytes; int and long are 4 bytes. In this mode, there is no support for float and double. Note the difference between '@' and '=': both use native byte order, but the size and alignment of the latter is standardized. The form '!' is available for those poor souls who can't remember whether network byte order is big-endian or little-endian. There is no way to indicate non-native byte order (i.e. force byte-swapping); use the appropriate choice of '<' or '>'.
1996-12-30 21:41:25 -04:00
const formatdef *f, *e;
char *str, *start, *fmt, *s;
char c;
1997-01-02 20:26:28 -04:00
int len, size, num;
1996-12-12 19:32:31 -04:00
PyObject *res, *v;
Pretty much rewritten to fulfull several long-standing wishes: -- The whole implementation is now more table-driven. -- Unsigned integers. Format characters 'B', 'H', 'I' and 'L' mean unsigned byte, short, int and long. For 'I' and 'L', the return value is a Python long integer if a Python plain integer can't represent the required range (note: this is dependent on the size of the relevant C types only, not of the sign of the actual value). -- A new format character 's' packs/unpacks a string. When given a count prefix, this is the size of the string, not a repeat count like for the other format characters; e.g. '10s' means a single 10-byte string, while '10c' means 10 characters. For packing, the string is truncated or padded with null bytes as appropriate to make it fit. For unpacking, the resulting string always has exactly the specified number of bytes. As a special case, '0s' means a single, empty string (while '0c' means 0 characters). -- Various byte order options. The first character of the format string determines the byte order, size and alignment, as follows: First character Byte order size and alignment '@' native native '=' native standard '<' little-endian standard '>' big-endian standard '!' network (= big-endian) standard If the first character is not one of these, '@' is assumed. Native byte order is big-endian or little-endian, depending on the host system (e.g. Motorola and Sun are big-endian; Intel and DEC are little-endian). Native size and alignment are determined using the C compiler's sizeof expression. This is always combined with native byte order. Standard size and alignment are as follows: no alignment is required for any type (so you have to use pad bytes); short is 2 bytes; int and long are 4 bytes. In this mode, there is no support for float and double. Note the difference between '@' and '=': both use native byte order, but the size and alignment of the latter is standardized. The form '!' is available for those poor souls who can't remember whether network byte order is big-endian or little-endian. There is no way to indicate non-native byte order (i.e. force byte-swapping); use the appropriate choice of '<' or '>'.
1996-12-30 21:41:25 -04:00
if (!PyArg_ParseTuple(args, "ss#", &fmt, &start, &len))
return NULL;
f = whichtable(&fmt);
size = calcsize(fmt, f);
if (size < 0)
return NULL;
if (size != len) {
1996-12-12 19:32:31 -04:00
PyErr_SetString(StructError,
Pretty much rewritten to fulfull several long-standing wishes: -- The whole implementation is now more table-driven. -- Unsigned integers. Format characters 'B', 'H', 'I' and 'L' mean unsigned byte, short, int and long. For 'I' and 'L', the return value is a Python long integer if a Python plain integer can't represent the required range (note: this is dependent on the size of the relevant C types only, not of the sign of the actual value). -- A new format character 's' packs/unpacks a string. When given a count prefix, this is the size of the string, not a repeat count like for the other format characters; e.g. '10s' means a single 10-byte string, while '10c' means 10 characters. For packing, the string is truncated or padded with null bytes as appropriate to make it fit. For unpacking, the resulting string always has exactly the specified number of bytes. As a special case, '0s' means a single, empty string (while '0c' means 0 characters). -- Various byte order options. The first character of the format string determines the byte order, size and alignment, as follows: First character Byte order size and alignment '@' native native '=' native standard '<' little-endian standard '>' big-endian standard '!' network (= big-endian) standard If the first character is not one of these, '@' is assumed. Native byte order is big-endian or little-endian, depending on the host system (e.g. Motorola and Sun are big-endian; Intel and DEC are little-endian). Native size and alignment are determined using the C compiler's sizeof expression. This is always combined with native byte order. Standard size and alignment are as follows: no alignment is required for any type (so you have to use pad bytes); short is 2 bytes; int and long are 4 bytes. In this mode, there is no support for float and double. Note the difference between '@' and '=': both use native byte order, but the size and alignment of the latter is standardized. The form '!' is available for those poor souls who can't remember whether network byte order is big-endian or little-endian. There is no way to indicate non-native byte order (i.e. force byte-swapping); use the appropriate choice of '<' or '>'.
1996-12-30 21:41:25 -04:00
"unpack str size does not match format");
return NULL;
}
1996-12-12 19:32:31 -04:00
res = PyList_New(0);
if (res == NULL)
return NULL;
str = start;
s = fmt;
while ((c = *s++) != '\0') {
if (isspace(c))
continue;
if ('0' <= c && c <= '9') {
num = c - '0';
while ('0' <= (c = *s++) && c <= '9')
num = num*10 + (c - '0');
if (c == '\0')
break;
}
else
num = 1;
Pretty much rewritten to fulfull several long-standing wishes: -- The whole implementation is now more table-driven. -- Unsigned integers. Format characters 'B', 'H', 'I' and 'L' mean unsigned byte, short, int and long. For 'I' and 'L', the return value is a Python long integer if a Python plain integer can't represent the required range (note: this is dependent on the size of the relevant C types only, not of the sign of the actual value). -- A new format character 's' packs/unpacks a string. When given a count prefix, this is the size of the string, not a repeat count like for the other format characters; e.g. '10s' means a single 10-byte string, while '10c' means 10 characters. For packing, the string is truncated or padded with null bytes as appropriate to make it fit. For unpacking, the resulting string always has exactly the specified number of bytes. As a special case, '0s' means a single, empty string (while '0c' means 0 characters). -- Various byte order options. The first character of the format string determines the byte order, size and alignment, as follows: First character Byte order size and alignment '@' native native '=' native standard '<' little-endian standard '>' big-endian standard '!' network (= big-endian) standard If the first character is not one of these, '@' is assumed. Native byte order is big-endian or little-endian, depending on the host system (e.g. Motorola and Sun are big-endian; Intel and DEC are little-endian). Native size and alignment are determined using the C compiler's sizeof expression. This is always combined with native byte order. Standard size and alignment are as follows: no alignment is required for any type (so you have to use pad bytes); short is 2 bytes; int and long are 4 bytes. In this mode, there is no support for float and double. Note the difference between '@' and '=': both use native byte order, but the size and alignment of the latter is standardized. The form '!' is available for those poor souls who can't remember whether network byte order is big-endian or little-endian. There is no way to indicate non-native byte order (i.e. force byte-swapping); use the appropriate choice of '<' or '>'.
1996-12-30 21:41:25 -04:00
e = getentry(c, f);
if (e == NULL)
goto fail;
str = start + align((int)(str-start), c, e);
if (num == 0 && c != 's')
continue;
Pretty much rewritten to fulfull several long-standing wishes: -- The whole implementation is now more table-driven. -- Unsigned integers. Format characters 'B', 'H', 'I' and 'L' mean unsigned byte, short, int and long. For 'I' and 'L', the return value is a Python long integer if a Python plain integer can't represent the required range (note: this is dependent on the size of the relevant C types only, not of the sign of the actual value). -- A new format character 's' packs/unpacks a string. When given a count prefix, this is the size of the string, not a repeat count like for the other format characters; e.g. '10s' means a single 10-byte string, while '10c' means 10 characters. For packing, the string is truncated or padded with null bytes as appropriate to make it fit. For unpacking, the resulting string always has exactly the specified number of bytes. As a special case, '0s' means a single, empty string (while '0c' means 0 characters). -- Various byte order options. The first character of the format string determines the byte order, size and alignment, as follows: First character Byte order size and alignment '@' native native '=' native standard '<' little-endian standard '>' big-endian standard '!' network (= big-endian) standard If the first character is not one of these, '@' is assumed. Native byte order is big-endian or little-endian, depending on the host system (e.g. Motorola and Sun are big-endian; Intel and DEC are little-endian). Native size and alignment are determined using the C compiler's sizeof expression. This is always combined with native byte order. Standard size and alignment are as follows: no alignment is required for any type (so you have to use pad bytes); short is 2 bytes; int and long are 4 bytes. In this mode, there is no support for float and double. Note the difference between '@' and '=': both use native byte order, but the size and alignment of the latter is standardized. The form '!' is available for those poor souls who can't remember whether network byte order is big-endian or little-endian. There is no way to indicate non-native byte order (i.e. force byte-swapping); use the appropriate choice of '<' or '>'.
1996-12-30 21:41:25 -04:00
do {
if (c == 'x') {
str += num;
break;
Pretty much rewritten to fulfull several long-standing wishes: -- The whole implementation is now more table-driven. -- Unsigned integers. Format characters 'B', 'H', 'I' and 'L' mean unsigned byte, short, int and long. For 'I' and 'L', the return value is a Python long integer if a Python plain integer can't represent the required range (note: this is dependent on the size of the relevant C types only, not of the sign of the actual value). -- A new format character 's' packs/unpacks a string. When given a count prefix, this is the size of the string, not a repeat count like for the other format characters; e.g. '10s' means a single 10-byte string, while '10c' means 10 characters. For packing, the string is truncated or padded with null bytes as appropriate to make it fit. For unpacking, the resulting string always has exactly the specified number of bytes. As a special case, '0s' means a single, empty string (while '0c' means 0 characters). -- Various byte order options. The first character of the format string determines the byte order, size and alignment, as follows: First character Byte order size and alignment '@' native native '=' native standard '<' little-endian standard '>' big-endian standard '!' network (= big-endian) standard If the first character is not one of these, '@' is assumed. Native byte order is big-endian or little-endian, depending on the host system (e.g. Motorola and Sun are big-endian; Intel and DEC are little-endian). Native size and alignment are determined using the C compiler's sizeof expression. This is always combined with native byte order. Standard size and alignment are as follows: no alignment is required for any type (so you have to use pad bytes); short is 2 bytes; int and long are 4 bytes. In this mode, there is no support for float and double. Note the difference between '@' and '=': both use native byte order, but the size and alignment of the latter is standardized. The form '!' is available for those poor souls who can't remember whether network byte order is big-endian or little-endian. There is no way to indicate non-native byte order (i.e. force byte-swapping); use the appropriate choice of '<' or '>'.
1996-12-30 21:41:25 -04:00
}
if (c == 's') {
/* num is string size, not repeat count */
v = PyString_FromStringAndSize(str, num);
if (v == NULL)
goto fail;
str += num;
num = 0;
}
else if (c == 'p') {
/* num is string buffer size,
not repeat count */
int n = *(unsigned char*)str;
/* first byte (unsigned) is string size */
if (n >= num)
n = num-1;
v = PyString_FromStringAndSize(str+1, n);
if (v == NULL)
Pretty much rewritten to fulfull several long-standing wishes: -- The whole implementation is now more table-driven. -- Unsigned integers. Format characters 'B', 'H', 'I' and 'L' mean unsigned byte, short, int and long. For 'I' and 'L', the return value is a Python long integer if a Python plain integer can't represent the required range (note: this is dependent on the size of the relevant C types only, not of the sign of the actual value). -- A new format character 's' packs/unpacks a string. When given a count prefix, this is the size of the string, not a repeat count like for the other format characters; e.g. '10s' means a single 10-byte string, while '10c' means 10 characters. For packing, the string is truncated or padded with null bytes as appropriate to make it fit. For unpacking, the resulting string always has exactly the specified number of bytes. As a special case, '0s' means a single, empty string (while '0c' means 0 characters). -- Various byte order options. The first character of the format string determines the byte order, size and alignment, as follows: First character Byte order size and alignment '@' native native '=' native standard '<' little-endian standard '>' big-endian standard '!' network (= big-endian) standard If the first character is not one of these, '@' is assumed. Native byte order is big-endian or little-endian, depending on the host system (e.g. Motorola and Sun are big-endian; Intel and DEC are little-endian). Native size and alignment are determined using the C compiler's sizeof expression. This is always combined with native byte order. Standard size and alignment are as follows: no alignment is required for any type (so you have to use pad bytes); short is 2 bytes; int and long are 4 bytes. In this mode, there is no support for float and double. Note the difference between '@' and '=': both use native byte order, but the size and alignment of the latter is standardized. The form '!' is available for those poor souls who can't remember whether network byte order is big-endian or little-endian. There is no way to indicate non-native byte order (i.e. force byte-swapping); use the appropriate choice of '<' or '>'.
1996-12-30 21:41:25 -04:00
goto fail;
str += num;
num = 0;
}
else {
v = e->unpack(str, e);
if (v == NULL)
goto fail;
str += e->size;
}
1996-12-12 19:32:31 -04:00
if (v == NULL || PyList_Append(res, v) < 0)
goto fail;
1996-12-12 19:32:31 -04:00
Py_DECREF(v);
Pretty much rewritten to fulfull several long-standing wishes: -- The whole implementation is now more table-driven. -- Unsigned integers. Format characters 'B', 'H', 'I' and 'L' mean unsigned byte, short, int and long. For 'I' and 'L', the return value is a Python long integer if a Python plain integer can't represent the required range (note: this is dependent on the size of the relevant C types only, not of the sign of the actual value). -- A new format character 's' packs/unpacks a string. When given a count prefix, this is the size of the string, not a repeat count like for the other format characters; e.g. '10s' means a single 10-byte string, while '10c' means 10 characters. For packing, the string is truncated or padded with null bytes as appropriate to make it fit. For unpacking, the resulting string always has exactly the specified number of bytes. As a special case, '0s' means a single, empty string (while '0c' means 0 characters). -- Various byte order options. The first character of the format string determines the byte order, size and alignment, as follows: First character Byte order size and alignment '@' native native '=' native standard '<' little-endian standard '>' big-endian standard '!' network (= big-endian) standard If the first character is not one of these, '@' is assumed. Native byte order is big-endian or little-endian, depending on the host system (e.g. Motorola and Sun are big-endian; Intel and DEC are little-endian). Native size and alignment are determined using the C compiler's sizeof expression. This is always combined with native byte order. Standard size and alignment are as follows: no alignment is required for any type (so you have to use pad bytes); short is 2 bytes; int and long are 4 bytes. In this mode, there is no support for float and double. Note the difference between '@' and '=': both use native byte order, but the size and alignment of the latter is standardized. The form '!' is available for those poor souls who can't remember whether network byte order is big-endian or little-endian. There is no way to indicate non-native byte order (i.e. force byte-swapping); use the appropriate choice of '<' or '>'.
1996-12-30 21:41:25 -04:00
} while (--num > 0);
}
Pretty much rewritten to fulfull several long-standing wishes: -- The whole implementation is now more table-driven. -- Unsigned integers. Format characters 'B', 'H', 'I' and 'L' mean unsigned byte, short, int and long. For 'I' and 'L', the return value is a Python long integer if a Python plain integer can't represent the required range (note: this is dependent on the size of the relevant C types only, not of the sign of the actual value). -- A new format character 's' packs/unpacks a string. When given a count prefix, this is the size of the string, not a repeat count like for the other format characters; e.g. '10s' means a single 10-byte string, while '10c' means 10 characters. For packing, the string is truncated or padded with null bytes as appropriate to make it fit. For unpacking, the resulting string always has exactly the specified number of bytes. As a special case, '0s' means a single, empty string (while '0c' means 0 characters). -- Various byte order options. The first character of the format string determines the byte order, size and alignment, as follows: First character Byte order size and alignment '@' native native '=' native standard '<' little-endian standard '>' big-endian standard '!' network (= big-endian) standard If the first character is not one of these, '@' is assumed. Native byte order is big-endian or little-endian, depending on the host system (e.g. Motorola and Sun are big-endian; Intel and DEC are little-endian). Native size and alignment are determined using the C compiler's sizeof expression. This is always combined with native byte order. Standard size and alignment are as follows: no alignment is required for any type (so you have to use pad bytes); short is 2 bytes; int and long are 4 bytes. In this mode, there is no support for float and double. Note the difference between '@' and '=': both use native byte order, but the size and alignment of the latter is standardized. The form '!' is available for those poor souls who can't remember whether network byte order is big-endian or little-endian. There is no way to indicate non-native byte order (i.e. force byte-swapping); use the appropriate choice of '<' or '>'.
1996-12-30 21:41:25 -04:00
v = PyList_AsTuple(res);
Py_DECREF(res);
return v;
fail:
1996-12-12 19:32:31 -04:00
Py_DECREF(res);
return NULL;
}
/* List of functions */
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static PyMethodDef struct_methods[] = {
Pretty much rewritten to fulfull several long-standing wishes: -- The whole implementation is now more table-driven. -- Unsigned integers. Format characters 'B', 'H', 'I' and 'L' mean unsigned byte, short, int and long. For 'I' and 'L', the return value is a Python long integer if a Python plain integer can't represent the required range (note: this is dependent on the size of the relevant C types only, not of the sign of the actual value). -- A new format character 's' packs/unpacks a string. When given a count prefix, this is the size of the string, not a repeat count like for the other format characters; e.g. '10s' means a single 10-byte string, while '10c' means 10 characters. For packing, the string is truncated or padded with null bytes as appropriate to make it fit. For unpacking, the resulting string always has exactly the specified number of bytes. As a special case, '0s' means a single, empty string (while '0c' means 0 characters). -- Various byte order options. The first character of the format string determines the byte order, size and alignment, as follows: First character Byte order size and alignment '@' native native '=' native standard '<' little-endian standard '>' big-endian standard '!' network (= big-endian) standard If the first character is not one of these, '@' is assumed. Native byte order is big-endian or little-endian, depending on the host system (e.g. Motorola and Sun are big-endian; Intel and DEC are little-endian). Native size and alignment are determined using the C compiler's sizeof expression. This is always combined with native byte order. Standard size and alignment are as follows: no alignment is required for any type (so you have to use pad bytes); short is 2 bytes; int and long are 4 bytes. In this mode, there is no support for float and double. Note the difference between '@' and '=': both use native byte order, but the size and alignment of the latter is standardized. The form '!' is available for those poor souls who can't remember whether network byte order is big-endian or little-endian. There is no way to indicate non-native byte order (i.e. force byte-swapping); use the appropriate choice of '<' or '>'.
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{"calcsize", struct_calcsize, METH_VARARGS},
{"pack", struct_pack, METH_VARARGS},
{"unpack", struct_unpack, METH_VARARGS},
{NULL, NULL} /* sentinel */
};
/* Module initialization */
void
initstruct()
{
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PyObject *m, *d;
/* Create the module and add the functions */
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m = Py_InitModule("struct", struct_methods);
/* Add some symbolic constants to the module */
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d = PyModule_GetDict(m);
StructError = PyErr_NewException("struct.error", NULL, NULL);
if (StructError == NULL)
return;
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PyDict_SetItemString(d, "error", StructError);
}