Merged revisions 61820-61823 via svnmerge from

svn+ssh://pythondev@svn.python.org/python/trunk

........
  r61820 | gregory.p.smith | 2008-03-23 23:14:38 +0100 (Sun, 23 Mar 2008) | 2 lines

  replace calls to get the initial values with the raw constants.
........
  r61821 | gregory.p.smith | 2008-03-24 00:43:02 +0100 (Mon, 24 Mar 2008) | 2 lines

  A bugfix for r61813, it would fail if the data size was >=2**32.
........
  r61822 | gregory.p.smith | 2008-03-24 00:45:12 +0100 (Mon, 24 Mar 2008) | 2 lines

  prevent a warning from the struct module when data size >= 2**32.
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  r61823 | gregory.p.smith | 2008-03-24 01:08:01 +0100 (Mon, 24 Mar 2008) | 4 lines

  Have the binascii module use zlib's optimized crc32() function when available
  to reduce our code size (1k data table and tiny bit of code).  It falls back
  to its own without zlib.
........
This commit is contained in:
Christian Heimes 2008-03-24 02:19:29 +00:00
parent f8bba8e843
commit 1dc5400939
4 changed files with 39 additions and 8 deletions

View File

@ -17,7 +17,6 @@ READ, WRITE = 1, 2
def U32(i):
"""Return i as an unsigned integer, assuming it fits in 32 bits.
If it's >= 2GB when viewed as a 32-bit unsigned int, return a long.
"""
if i < 0:
@ -320,7 +319,7 @@ class GzipFile:
if crc32 != self.crc:
raise IOError("CRC check failed %s != %s" % (hex(crc32),
hex(self.crc)))
elif isize != self.size:
elif isize != (self.size & 0xffffffff):
raise IOError("Incorrect length of data produced")
def close(self):
@ -328,7 +327,7 @@ class GzipFile:
self.fileobj.write(self.compress.flush())
write32u(self.fileobj, self.crc)
# self.size may exceed 2GB, or even 4GB
write32u(self.fileobj, self.size)
write32u(self.fileobj, self.size & 0xffffffff)
self.fileobj = None
elif self.mode == READ:
self.fileobj = None

View File

@ -56,6 +56,9 @@
#define PY_SSIZE_T_CLEAN
#include "Python.h"
#ifdef USE_ZLIB_CRC32
#include "zlib.h"
#endif
static PyObject *Error;
static PyObject *Incomplete;
@ -776,6 +779,20 @@ binascii_crc_hqx(PyObject *self, PyObject *args)
PyDoc_STRVAR(doc_crc32,
"(data, oldcrc = 0) -> newcrc. Compute CRC-32 incrementally");
#ifdef USE_ZLIB_CRC32
/* This was taken from zlibmodule.c PyZlib_crc32 (but is PY_SSIZE_T_CLEAN) */
static PyObject *
binascii_crc32(PyObject *self, PyObject *args)
{
uLong crc32val = 0; /* crc32(0L, Z_NULL, 0) */
Byte *buf;
int len;
if (!PyArg_ParseTuple(args, "s#|I:crc32", &buf, &len, &crc32val))
return NULL;
crc32val = crc32(crc32val, buf, len);
return PyLong_FromUnsignedLong(crc32val & 0xffffffffU);
}
#else /* USE_ZLIB_CRC32 */
/* Crc - 32 BIT ANSI X3.66 CRC checksum files
Also known as: ISO 3307
**********************************************************************|
@ -914,6 +931,7 @@ binascii_crc32(PyObject *self, PyObject *args)
result = (crc ^ 0xFFFFFFFF);
return PyLong_FromUnsignedLong(result & 0xffffffff);
}
#endif /* USE_ZLIB_CRC32 */
static PyObject *

View File

@ -915,7 +915,7 @@ PyDoc_STRVAR(adler32__doc__,
static PyObject *
PyZlib_adler32(PyObject *self, PyObject *args)
{
unsigned int adler32val = adler32(0L, Z_NULL, 0);
uLong adler32val = 1; /* adler32(0L, Z_NULL, 0) */
Byte *buf;
int len;
@ -934,7 +934,7 @@ PyDoc_STRVAR(crc32__doc__,
static PyObject *
PyZlib_crc32(PyObject *self, PyObject *args)
{
unsigned int crc32val = crc32(0L, Z_NULL, 0);
uLong crc32val = 0; /* crc32(0L, Z_NULL, 0) */
Byte *buf;
int len;
if (!PyArg_ParseTuple(args, "s#|I:crc32", &buf, &len, &crc32val))

View File

@ -472,9 +472,6 @@ class PyBuildExt(build_ext):
# select(2); not on ancient System V
exts.append( Extension('select', ['selectmodule.c']) )
# Helper module for various ascii-encoders
exts.append( Extension('binascii', ['binascii.c']) )
# Fred Drake's interface to the Python parser
exts.append( Extension('parser', ['parsermodule.c']) )
@ -1005,6 +1002,7 @@ class PyBuildExt(build_ext):
# You can upgrade zlib to version 1.1.4 yourself by going to
# http://www.gzip.org/zlib/
zlib_inc = find_file('zlib.h', [], inc_dirs)
have_zlib = False
if zlib_inc is not None:
zlib_h = zlib_inc[0] + '/zlib.h'
version = '"0.0.0"'
@ -1026,6 +1024,7 @@ class PyBuildExt(build_ext):
exts.append( Extension('zlib', ['zlibmodule.c'],
libraries = ['z'],
extra_link_args = zlib_extra_link_args))
have_zlib = True
else:
missing.append('zlib')
else:
@ -1033,6 +1032,21 @@ class PyBuildExt(build_ext):
else:
missing.append('zlib')
# Helper module for various ascii-encoders. Uses zlib for an optimized
# crc32 if we have it. Otherwise binascii uses its own.
if have_zlib:
extra_compile_args = ['-DUSE_ZLIB_CRC32']
libraries = ['z']
extra_link_args = zlib_extra_link_args
else:
extra_compile_args = []
libraries = []
extra_link_args = []
exts.append( Extension('binascii', ['binascii.c'],
extra_compile_args = extra_compile_args,
libraries = libraries,
extra_link_args = extra_link_args) )
# Gustavo Niemeyer's bz2 module.
if (self.compiler.find_library_file(lib_dirs, 'bz2')):
if sys.platform == "darwin":