1144 lines
33 KiB
C
1144 lines
33 KiB
C
#include "Python.h"
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#include "structmember.h" /* for offsetof() */
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#include "_iomodule.h"
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|
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typedef struct {
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PyObject_HEAD
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char *buf;
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Py_ssize_t pos;
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Py_ssize_t string_size;
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size_t buf_size;
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PyObject *dict;
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PyObject *weakreflist;
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Py_ssize_t exports;
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/** If `initvalue' != NULL, `buf' is a read-only pointer into the PyBytes
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* referenced by `initvalue'. It must be copied prior to mutation, and
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* released during finalization */
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PyObject *initvalue;
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} bytesio;
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typedef struct {
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PyObject_HEAD
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bytesio *source;
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} bytesiobuf;
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|
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#define CHECK_CLOSED(self, ret) \
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if ((self)->buf == NULL) { \
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PyErr_SetString(PyExc_ValueError, \
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"I/O operation on closed file."); \
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return ret; \
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}
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#define CHECK_EXPORTS(self) \
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if ((self)->exports > 0) { \
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PyErr_SetString(PyExc_BufferError, \
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"Existing exports of data: object cannot be re-sized"); \
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return NULL; \
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}
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/* Ensure we have a buffer suitable for writing, in the case that an initvalue
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* object was provided, and we're currently borrowing its buffer. `size'
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* indicates the new buffer size allocated as part of unsharing, to avoid a
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* redundant reallocation caused by any subsequent mutation. `truncate'
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* indicates whether truncation should occur if `size` < self->string_size.
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*
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* Do nothing if the buffer wasn't shared. Returns 0 on success, or sets an
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* exception and returns -1 on failure. Existing state is preserved on failure.
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*/
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static int
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unshare(bytesio *self, size_t preferred_size, int truncate)
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{
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if (self->initvalue) {
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Py_ssize_t copy_size;
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char *new_buf;
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if((! truncate) && preferred_size < self->string_size) {
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preferred_size = self->string_size;
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}
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new_buf = (char *)PyMem_Malloc(preferred_size);
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if (new_buf == NULL) {
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PyErr_NoMemory();
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return -1;
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}
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copy_size = self->string_size;
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if (copy_size > preferred_size) {
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copy_size = preferred_size;
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}
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memcpy(new_buf, self->buf, copy_size);
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Py_CLEAR(self->initvalue);
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self->buf = new_buf;
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self->buf_size = preferred_size;
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self->string_size = (Py_ssize_t) copy_size;
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}
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return 0;
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}
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/* Internal routine to get a line from the buffer of a BytesIO
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object. Returns the length between the current position to the
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next newline character. */
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static Py_ssize_t
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get_line(bytesio *self, char **output)
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{
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char *n;
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const char *str_end;
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Py_ssize_t len;
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assert(self->buf != NULL);
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/* Move to the end of the line, up to the end of the string, s. */
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str_end = self->buf + self->string_size;
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for (n = self->buf + self->pos;
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n < str_end && *n != '\n';
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n++);
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/* Skip the newline character */
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if (n < str_end)
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n++;
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/* Get the length from the current position to the end of the line. */
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len = n - (self->buf + self->pos);
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*output = self->buf + self->pos;
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assert(len >= 0);
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assert(self->pos < PY_SSIZE_T_MAX - len);
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self->pos += len;
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return len;
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}
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/* Internal routine for changing the size of the buffer of BytesIO objects.
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The caller should ensure that the 'size' argument is non-negative. Returns
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0 on success, -1 otherwise. */
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static int
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resize_buffer(bytesio *self, size_t size)
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{
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/* Here, unsigned types are used to avoid dealing with signed integer
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overflow, which is undefined in C. */
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size_t alloc = self->buf_size;
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char *new_buf = NULL;
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assert(self->buf != NULL);
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/* For simplicity, stay in the range of the signed type. Anyway, Python
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doesn't allow strings to be longer than this. */
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if (size > PY_SSIZE_T_MAX)
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goto overflow;
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if (size < alloc / 2) {
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/* Major downsize; resize down to exact size. */
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alloc = size + 1;
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}
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else if (size < alloc) {
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/* Within allocated size; quick exit */
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return 0;
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}
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else if (size <= alloc * 1.125) {
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/* Moderate upsize; overallocate similar to list_resize() */
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alloc = size + (size >> 3) + (size < 9 ? 3 : 6);
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}
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else {
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/* Major upsize; resize up to exact size */
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alloc = size + 1;
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}
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if (alloc > ((size_t)-1) / sizeof(char))
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goto overflow;
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new_buf = (char *)PyMem_Realloc(self->buf, alloc * sizeof(char));
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if (new_buf == NULL) {
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PyErr_NoMemory();
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return -1;
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}
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self->buf_size = alloc;
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self->buf = new_buf;
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return 0;
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overflow:
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PyErr_SetString(PyExc_OverflowError,
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"new buffer size too large");
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return -1;
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}
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/* Internal routine for writing a string of bytes to the buffer of a BytesIO
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object. Returns the number of bytes written, or -1 on error. */
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static Py_ssize_t
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write_bytes(bytesio *self, const char *bytes, Py_ssize_t len)
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{
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size_t desired;
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assert(self->buf != NULL);
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assert(self->pos >= 0);
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assert(len >= 0);
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desired = (size_t)self->pos + len;
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if (unshare(self, desired, 0) < 0) {
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return -1;
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}
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if (desired > self->buf_size) {
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if (resize_buffer(self, (size_t)self->pos + len) < 0)
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return -1;
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}
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if (self->pos > self->string_size) {
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/* In case of overseek, pad with null bytes the buffer region between
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the end of stream and the current position.
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0 lo string_size hi
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| |<---used--->|<----------available----------->|
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| | <--to pad-->|<---to write---> |
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0 buf position
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*/
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memset(self->buf + self->string_size, '\0',
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(self->pos - self->string_size) * sizeof(char));
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}
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/* Copy the data to the internal buffer, overwriting some of the existing
|
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data if self->pos < self->string_size. */
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memcpy(self->buf + self->pos, bytes, len);
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self->pos += len;
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/* Set the new length of the internal string if it has changed. */
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if (self->string_size < self->pos) {
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self->string_size = self->pos;
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}
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return len;
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}
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/* Release or free any existing buffer, and place the BytesIO in the closed
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* state. */
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static void
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reset(bytesio *self)
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{
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if (self->initvalue) {
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Py_CLEAR(self->initvalue);
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} else if (self->buf) {
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PyMem_Free(self->buf);
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}
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self->buf = NULL;
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self->string_size = 0;
|
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self->pos = 0;
|
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}
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/* Reinitialize with a new heap-allocated buffer of size `size`. Returns 0 on
|
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* success, or sets an exception and returns -1 on failure. Existing state is
|
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* preserved on failure. */
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static int
|
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reinit_private(bytesio *self, Py_ssize_t size)
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{
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char *tmp = (char *)PyMem_Malloc(size);
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if (tmp == NULL) {
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PyErr_NoMemory();
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return -1;
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}
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reset(self);
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self->buf = tmp;
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self->buf_size = size;
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return 0;
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}
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/* Internal version of BytesIO.__init__; resets the object to its initial
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* (closed) state before repopulating it, optionally by sharing a PyBytes
|
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* buffer provided by `initvalue'. Returns 0 on success, or sets an exception
|
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* and returns -1 on failure. */
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static int
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reinit(bytesio *self, PyObject *initvalue)
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{
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CHECK_CLOSED(self, -1);
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if (initvalue == NULL || initvalue == Py_None) {
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if (reinit_private(self, 0) < 0) {
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return -1;
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}
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} else if (PyBytes_CheckExact(initvalue)) {
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reset(self);
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Py_INCREF(initvalue);
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self->initvalue = initvalue;
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self->buf = PyBytes_AS_STRING(initvalue);
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self->buf_size = PyBytes_GET_SIZE(initvalue);
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self->string_size = PyBytes_GET_SIZE(initvalue);
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} else {
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Py_buffer buf;
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if (PyObject_GetBuffer(initvalue, &buf, PyBUF_CONTIG_RO) < 0) {
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return -1;
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}
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if (reinit_private(self, buf.len) < 0) {
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PyBuffer_Release(&buf);
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return -1;
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}
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memcpy(self->buf, buf.buf, buf.len);
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self->string_size = buf.len;
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PyBuffer_Release(&buf);
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}
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return 0;
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}
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static PyObject *
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bytesio_get_closed(bytesio *self)
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{
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if (self->buf == NULL) {
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Py_RETURN_TRUE;
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}
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else {
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Py_RETURN_FALSE;
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}
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}
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PyDoc_STRVAR(readable_doc,
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"readable() -> bool. Returns True if the IO object can be read.");
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PyDoc_STRVAR(writable_doc,
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"writable() -> bool. Returns True if the IO object can be written.");
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PyDoc_STRVAR(seekable_doc,
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"seekable() -> bool. Returns True if the IO object can be seeked.");
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/* Generic getter for the writable, readable and seekable properties */
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static PyObject *
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return_not_closed(bytesio *self)
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{
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CHECK_CLOSED(self, NULL);
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Py_RETURN_TRUE;
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}
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PyDoc_STRVAR(flush_doc,
|
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"flush() -> None. Does nothing.");
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|
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static PyObject *
|
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bytesio_flush(bytesio *self)
|
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{
|
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CHECK_CLOSED(self, NULL);
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Py_RETURN_NONE;
|
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}
|
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|
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PyDoc_STRVAR(getbuffer_doc,
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"getbuffer() -> bytes.\n"
|
|
"\n"
|
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"Get a read-write view over the contents of the BytesIO object.");
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|
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static PyObject *
|
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bytesio_getbuffer(bytesio *self)
|
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{
|
|
PyTypeObject *type = &_PyBytesIOBuffer_Type;
|
|
bytesiobuf *buf;
|
|
PyObject *view;
|
|
|
|
CHECK_CLOSED(self, NULL);
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|
|
buf = (bytesiobuf *) type->tp_alloc(type, 0);
|
|
if (buf == NULL)
|
|
return NULL;
|
|
Py_INCREF(self);
|
|
buf->source = self;
|
|
view = PyMemoryView_FromObject((PyObject *) buf);
|
|
Py_DECREF(buf);
|
|
return view;
|
|
}
|
|
|
|
PyDoc_STRVAR(getval_doc,
|
|
"getvalue() -> bytes.\n"
|
|
"\n"
|
|
"Retrieve the entire contents of the BytesIO object.");
|
|
|
|
static PyObject *
|
|
bytesio_getvalue(bytesio *self)
|
|
{
|
|
CHECK_CLOSED(self, NULL);
|
|
return PyBytes_FromStringAndSize(self->buf, self->string_size);
|
|
}
|
|
|
|
PyDoc_STRVAR(isatty_doc,
|
|
"isatty() -> False.\n"
|
|
"\n"
|
|
"Always returns False since BytesIO objects are not connected\n"
|
|
"to a tty-like device.");
|
|
|
|
static PyObject *
|
|
bytesio_isatty(bytesio *self)
|
|
{
|
|
CHECK_CLOSED(self, NULL);
|
|
Py_RETURN_FALSE;
|
|
}
|
|
|
|
PyDoc_STRVAR(tell_doc,
|
|
"tell() -> current file position, an integer\n");
|
|
|
|
static PyObject *
|
|
bytesio_tell(bytesio *self)
|
|
{
|
|
CHECK_CLOSED(self, NULL);
|
|
return PyLong_FromSsize_t(self->pos);
|
|
}
|
|
|
|
PyDoc_STRVAR(read_doc,
|
|
"read([size]) -> read at most size bytes, returned as a string.\n"
|
|
"\n"
|
|
"If the size argument is negative, read until EOF is reached.\n"
|
|
"Return an empty string at EOF.");
|
|
|
|
static PyObject *
|
|
bytesio_read(bytesio *self, PyObject *args)
|
|
{
|
|
Py_ssize_t size, n;
|
|
char *output;
|
|
PyObject *arg = Py_None;
|
|
|
|
CHECK_CLOSED(self, NULL);
|
|
|
|
if (!PyArg_ParseTuple(args, "|O:read", &arg))
|
|
return NULL;
|
|
|
|
if (PyLong_Check(arg)) {
|
|
size = PyLong_AsSsize_t(arg);
|
|
if (size == -1 && PyErr_Occurred())
|
|
return NULL;
|
|
}
|
|
else if (arg == Py_None) {
|
|
/* Read until EOF is reached, by default. */
|
|
size = -1;
|
|
}
|
|
else {
|
|
PyErr_Format(PyExc_TypeError, "integer argument expected, got '%s'",
|
|
Py_TYPE(arg)->tp_name);
|
|
return NULL;
|
|
}
|
|
|
|
/* adjust invalid sizes */
|
|
n = self->string_size - self->pos;
|
|
if (size < 0 || size > n) {
|
|
size = n;
|
|
if (size < 0)
|
|
size = 0;
|
|
}
|
|
|
|
assert(self->buf != NULL);
|
|
output = self->buf + self->pos;
|
|
self->pos += size;
|
|
|
|
return PyBytes_FromStringAndSize(output, size);
|
|
}
|
|
|
|
|
|
PyDoc_STRVAR(read1_doc,
|
|
"read1(size) -> read at most size bytes, returned as a string.\n"
|
|
"\n"
|
|
"If the size argument is negative or omitted, read until EOF is reached.\n"
|
|
"Return an empty string at EOF.");
|
|
|
|
static PyObject *
|
|
bytesio_read1(bytesio *self, PyObject *n)
|
|
{
|
|
PyObject *arg, *res;
|
|
|
|
arg = PyTuple_Pack(1, n);
|
|
if (arg == NULL)
|
|
return NULL;
|
|
res = bytesio_read(self, arg);
|
|
Py_DECREF(arg);
|
|
return res;
|
|
}
|
|
|
|
PyDoc_STRVAR(readline_doc,
|
|
"readline([size]) -> next line from the file, as a string.\n"
|
|
"\n"
|
|
"Retain newline. A non-negative size argument limits the maximum\n"
|
|
"number of bytes to return (an incomplete line may be returned then).\n"
|
|
"Return an empty string at EOF.\n");
|
|
|
|
static PyObject *
|
|
bytesio_readline(bytesio *self, PyObject *args)
|
|
{
|
|
Py_ssize_t size, n;
|
|
char *output;
|
|
PyObject *arg = Py_None;
|
|
|
|
CHECK_CLOSED(self, NULL);
|
|
|
|
if (!PyArg_ParseTuple(args, "|O:readline", &arg))
|
|
return NULL;
|
|
|
|
if (PyLong_Check(arg)) {
|
|
size = PyLong_AsSsize_t(arg);
|
|
if (size == -1 && PyErr_Occurred())
|
|
return NULL;
|
|
}
|
|
else if (arg == Py_None) {
|
|
/* No size limit, by default. */
|
|
size = -1;
|
|
}
|
|
else {
|
|
PyErr_Format(PyExc_TypeError, "integer argument expected, got '%s'",
|
|
Py_TYPE(arg)->tp_name);
|
|
return NULL;
|
|
}
|
|
|
|
n = get_line(self, &output);
|
|
|
|
if (size >= 0 && size < n) {
|
|
size = n - size;
|
|
n -= size;
|
|
self->pos -= size;
|
|
}
|
|
|
|
return PyBytes_FromStringAndSize(output, n);
|
|
}
|
|
|
|
PyDoc_STRVAR(readlines_doc,
|
|
"readlines([size]) -> list of strings, each a line from the file.\n"
|
|
"\n"
|
|
"Call readline() repeatedly and return a list of the lines so read.\n"
|
|
"The optional size argument, if given, is an approximate bound on the\n"
|
|
"total number of bytes in the lines returned.\n");
|
|
|
|
static PyObject *
|
|
bytesio_readlines(bytesio *self, PyObject *args)
|
|
{
|
|
Py_ssize_t maxsize, size, n;
|
|
PyObject *result, *line;
|
|
char *output;
|
|
PyObject *arg = Py_None;
|
|
|
|
CHECK_CLOSED(self, NULL);
|
|
|
|
if (!PyArg_ParseTuple(args, "|O:readlines", &arg))
|
|
return NULL;
|
|
|
|
if (PyLong_Check(arg)) {
|
|
maxsize = PyLong_AsSsize_t(arg);
|
|
if (maxsize == -1 && PyErr_Occurred())
|
|
return NULL;
|
|
}
|
|
else if (arg == Py_None) {
|
|
/* No size limit, by default. */
|
|
maxsize = -1;
|
|
}
|
|
else {
|
|
PyErr_Format(PyExc_TypeError, "integer argument expected, got '%s'",
|
|
Py_TYPE(arg)->tp_name);
|
|
return NULL;
|
|
}
|
|
|
|
size = 0;
|
|
result = PyList_New(0);
|
|
if (!result)
|
|
return NULL;
|
|
|
|
while ((n = get_line(self, &output)) != 0) {
|
|
line = PyBytes_FromStringAndSize(output, n);
|
|
if (!line)
|
|
goto on_error;
|
|
if (PyList_Append(result, line) == -1) {
|
|
Py_DECREF(line);
|
|
goto on_error;
|
|
}
|
|
Py_DECREF(line);
|
|
size += n;
|
|
if (maxsize > 0 && size >= maxsize)
|
|
break;
|
|
}
|
|
return result;
|
|
|
|
on_error:
|
|
Py_DECREF(result);
|
|
return NULL;
|
|
}
|
|
|
|
PyDoc_STRVAR(readinto_doc,
|
|
"readinto(bytearray) -> int. Read up to len(b) bytes into b.\n"
|
|
"\n"
|
|
"Returns number of bytes read (0 for EOF), or None if the object\n"
|
|
"is set not to block as has no data to read.");
|
|
|
|
static PyObject *
|
|
bytesio_readinto(bytesio *self, PyObject *buffer)
|
|
{
|
|
void *raw_buffer;
|
|
Py_ssize_t len, n;
|
|
|
|
CHECK_CLOSED(self, NULL);
|
|
|
|
if (PyObject_AsWriteBuffer(buffer, &raw_buffer, &len) == -1)
|
|
return NULL;
|
|
|
|
/* adjust invalid sizes */
|
|
n = self->string_size - self->pos;
|
|
if (len > n) {
|
|
len = n;
|
|
if (len < 0)
|
|
len = 0;
|
|
}
|
|
|
|
memcpy(raw_buffer, self->buf + self->pos, len);
|
|
assert(self->pos + len < PY_SSIZE_T_MAX);
|
|
assert(len >= 0);
|
|
self->pos += len;
|
|
|
|
return PyLong_FromSsize_t(len);
|
|
}
|
|
|
|
PyDoc_STRVAR(truncate_doc,
|
|
"truncate([size]) -> int. Truncate the file to at most size bytes.\n"
|
|
"\n"
|
|
"Size defaults to the current file position, as returned by tell().\n"
|
|
"The current file position is unchanged. Returns the new size.\n");
|
|
|
|
static PyObject *
|
|
bytesio_truncate(bytesio *self, PyObject *args)
|
|
{
|
|
Py_ssize_t size;
|
|
PyObject *arg = Py_None;
|
|
|
|
CHECK_CLOSED(self, NULL);
|
|
CHECK_EXPORTS(self);
|
|
|
|
if (!PyArg_ParseTuple(args, "|O:truncate", &arg))
|
|
return NULL;
|
|
|
|
if (PyLong_Check(arg)) {
|
|
size = PyLong_AsSsize_t(arg);
|
|
if (size == -1 && PyErr_Occurred())
|
|
return NULL;
|
|
}
|
|
else if (arg == Py_None) {
|
|
/* Truncate to current position if no argument is passed. */
|
|
size = self->pos;
|
|
}
|
|
else {
|
|
PyErr_Format(PyExc_TypeError, "integer argument expected, got '%s'",
|
|
Py_TYPE(arg)->tp_name);
|
|
return NULL;
|
|
}
|
|
|
|
if (size < 0) {
|
|
PyErr_Format(PyExc_ValueError,
|
|
"negative size value %zd", size);
|
|
return NULL;
|
|
}
|
|
|
|
if (unshare(self, size, 1) < 0) {
|
|
return NULL;
|
|
}
|
|
|
|
if (size < self->string_size) {
|
|
self->string_size = size;
|
|
if (resize_buffer(self, size) < 0)
|
|
return NULL;
|
|
}
|
|
|
|
return PyLong_FromSsize_t(size);
|
|
}
|
|
|
|
static PyObject *
|
|
bytesio_iternext(bytesio *self)
|
|
{
|
|
char *next;
|
|
Py_ssize_t n;
|
|
|
|
CHECK_CLOSED(self, NULL);
|
|
|
|
n = get_line(self, &next);
|
|
|
|
if (!next || n == 0)
|
|
return NULL;
|
|
|
|
return PyBytes_FromStringAndSize(next, n);
|
|
}
|
|
|
|
PyDoc_STRVAR(seek_doc,
|
|
"seek(pos, whence=0) -> int. Change stream position.\n"
|
|
"\n"
|
|
"Seek to byte offset pos relative to position indicated by whence:\n"
|
|
" 0 Start of stream (the default). pos should be >= 0;\n"
|
|
" 1 Current position - pos may be negative;\n"
|
|
" 2 End of stream - pos usually negative.\n"
|
|
"Returns the new absolute position.");
|
|
|
|
static PyObject *
|
|
bytesio_seek(bytesio *self, PyObject *args)
|
|
{
|
|
Py_ssize_t pos;
|
|
int mode = 0;
|
|
|
|
CHECK_CLOSED(self, NULL);
|
|
|
|
if (!PyArg_ParseTuple(args, "n|i:seek", &pos, &mode))
|
|
return NULL;
|
|
|
|
if (pos < 0 && mode == 0) {
|
|
PyErr_Format(PyExc_ValueError,
|
|
"negative seek value %zd", pos);
|
|
return NULL;
|
|
}
|
|
|
|
/* mode 0: offset relative to beginning of the string.
|
|
mode 1: offset relative to current position.
|
|
mode 2: offset relative the end of the string. */
|
|
if (mode == 1) {
|
|
if (pos > PY_SSIZE_T_MAX - self->pos) {
|
|
PyErr_SetString(PyExc_OverflowError,
|
|
"new position too large");
|
|
return NULL;
|
|
}
|
|
pos += self->pos;
|
|
}
|
|
else if (mode == 2) {
|
|
if (pos > PY_SSIZE_T_MAX - self->string_size) {
|
|
PyErr_SetString(PyExc_OverflowError,
|
|
"new position too large");
|
|
return NULL;
|
|
}
|
|
pos += self->string_size;
|
|
}
|
|
else if (mode != 0) {
|
|
PyErr_Format(PyExc_ValueError,
|
|
"invalid whence (%i, should be 0, 1 or 2)", mode);
|
|
return NULL;
|
|
}
|
|
|
|
if (pos < 0)
|
|
pos = 0;
|
|
self->pos = pos;
|
|
|
|
return PyLong_FromSsize_t(self->pos);
|
|
}
|
|
|
|
PyDoc_STRVAR(write_doc,
|
|
"write(bytes) -> int. Write bytes to file.\n"
|
|
"\n"
|
|
"Return the number of bytes written.");
|
|
|
|
static PyObject *
|
|
bytesio_write(bytesio *self, PyObject *obj)
|
|
{
|
|
Py_ssize_t n = 0;
|
|
Py_buffer buf;
|
|
PyObject *result = NULL;
|
|
|
|
CHECK_CLOSED(self, NULL);
|
|
CHECK_EXPORTS(self);
|
|
|
|
if (PyObject_GetBuffer(obj, &buf, PyBUF_CONTIG_RO) < 0)
|
|
return NULL;
|
|
|
|
if (buf.len != 0)
|
|
n = write_bytes(self, buf.buf, buf.len);
|
|
if (n >= 0)
|
|
result = PyLong_FromSsize_t(n);
|
|
|
|
PyBuffer_Release(&buf);
|
|
return result;
|
|
}
|
|
|
|
PyDoc_STRVAR(writelines_doc,
|
|
"writelines(sequence_of_strings) -> None. Write strings to the file.\n"
|
|
"\n"
|
|
"Note that newlines are not added. The sequence can be any iterable\n"
|
|
"object producing strings. This is equivalent to calling write() for\n"
|
|
"each string.");
|
|
|
|
static PyObject *
|
|
bytesio_writelines(bytesio *self, PyObject *v)
|
|
{
|
|
PyObject *it, *item;
|
|
PyObject *ret;
|
|
|
|
CHECK_CLOSED(self, NULL);
|
|
|
|
it = PyObject_GetIter(v);
|
|
if (it == NULL)
|
|
return NULL;
|
|
|
|
while ((item = PyIter_Next(it)) != NULL) {
|
|
ret = bytesio_write(self, item);
|
|
Py_DECREF(item);
|
|
if (ret == NULL) {
|
|
Py_DECREF(it);
|
|
return NULL;
|
|
}
|
|
Py_DECREF(ret);
|
|
}
|
|
Py_DECREF(it);
|
|
|
|
/* See if PyIter_Next failed */
|
|
if (PyErr_Occurred())
|
|
return NULL;
|
|
|
|
Py_RETURN_NONE;
|
|
}
|
|
|
|
PyDoc_STRVAR(close_doc,
|
|
"close() -> None. Disable all I/O operations.");
|
|
|
|
static PyObject *
|
|
bytesio_close(bytesio *self)
|
|
{
|
|
reset(self);
|
|
Py_RETURN_NONE;
|
|
}
|
|
|
|
/* Pickling support.
|
|
|
|
Note that only pickle protocol 2 and onward are supported since we use
|
|
extended __reduce__ API of PEP 307 to make BytesIO instances picklable.
|
|
|
|
Providing support for protocol < 2 would require the __reduce_ex__ method
|
|
which is notably long-winded when defined properly.
|
|
|
|
For BytesIO, the implementation would similar to one coded for
|
|
object.__reduce_ex__, but slightly less general. To be more specific, we
|
|
could call bytesio_getstate directly and avoid checking for the presence of
|
|
a fallback __reduce__ method. However, we would still need a __newobj__
|
|
function to use the efficient instance representation of PEP 307.
|
|
*/
|
|
|
|
static PyObject *
|
|
bytesio_getstate(bytesio *self)
|
|
{
|
|
PyObject *initvalue = bytesio_getvalue(self);
|
|
PyObject *dict;
|
|
PyObject *state;
|
|
|
|
if (initvalue == NULL)
|
|
return NULL;
|
|
if (self->dict == NULL) {
|
|
Py_INCREF(Py_None);
|
|
dict = Py_None;
|
|
}
|
|
else {
|
|
dict = PyDict_Copy(self->dict);
|
|
if (dict == NULL) {
|
|
Py_DECREF(initvalue);
|
|
return NULL;
|
|
}
|
|
}
|
|
|
|
state = Py_BuildValue("(OnN)", initvalue, self->pos, dict);
|
|
Py_DECREF(initvalue);
|
|
return state;
|
|
}
|
|
|
|
static PyObject *
|
|
bytesio_setstate(bytesio *self, PyObject *state)
|
|
{
|
|
PyObject *position_obj;
|
|
PyObject *dict;
|
|
Py_ssize_t pos;
|
|
|
|
CHECK_EXPORTS(self);
|
|
assert(state != NULL);
|
|
|
|
/* We allow the state tuple to be longer than 3, because we may need
|
|
someday to extend the object's state without breaking
|
|
backward-compatibility. */
|
|
if (!PyTuple_Check(state) || Py_SIZE(state) < 3) {
|
|
PyErr_Format(PyExc_TypeError,
|
|
"%.200s.__setstate__ argument should be 3-tuple, got %.200s",
|
|
Py_TYPE(self)->tp_name, Py_TYPE(state)->tp_name);
|
|
return NULL;
|
|
}
|
|
|
|
/* Reset the object to its default state and set the value of the internal
|
|
* buffer. If state[0] does not support the buffer protocol, reinit() will
|
|
* raise the appropriate TypeError. */
|
|
if (reinit(self, PyTuple_GET_ITEM(state, 0)) < 0) {
|
|
return NULL;
|
|
}
|
|
|
|
/* Set carefully the position value. Alternatively, we could use the seek
|
|
method instead of modifying self->pos directly to better protect the
|
|
object internal state against errneous (or malicious) inputs. */
|
|
position_obj = PyTuple_GET_ITEM(state, 1);
|
|
if (!PyLong_Check(position_obj)) {
|
|
PyErr_Format(PyExc_TypeError,
|
|
"second item of state must be an integer, not %.200s",
|
|
Py_TYPE(position_obj)->tp_name);
|
|
return NULL;
|
|
}
|
|
pos = PyLong_AsSsize_t(position_obj);
|
|
if (pos == -1 && PyErr_Occurred())
|
|
return NULL;
|
|
if (pos < 0) {
|
|
PyErr_SetString(PyExc_ValueError,
|
|
"position value cannot be negative");
|
|
return NULL;
|
|
}
|
|
self->pos = pos;
|
|
|
|
/* Set the dictionary of the instance variables. */
|
|
dict = PyTuple_GET_ITEM(state, 2);
|
|
if (dict != Py_None) {
|
|
if (!PyDict_Check(dict)) {
|
|
PyErr_Format(PyExc_TypeError,
|
|
"third item of state should be a dict, got a %.200s",
|
|
Py_TYPE(dict)->tp_name);
|
|
return NULL;
|
|
}
|
|
if (self->dict) {
|
|
/* Alternatively, we could replace the internal dictionary
|
|
completely. However, it seems more practical to just update it. */
|
|
if (PyDict_Update(self->dict, dict) < 0)
|
|
return NULL;
|
|
}
|
|
else {
|
|
Py_INCREF(dict);
|
|
self->dict = dict;
|
|
}
|
|
}
|
|
|
|
Py_RETURN_NONE;
|
|
}
|
|
|
|
static void
|
|
bytesio_dealloc(bytesio *self)
|
|
{
|
|
_PyObject_GC_UNTRACK(self);
|
|
if (self->exports > 0) {
|
|
PyErr_SetString(PyExc_SystemError,
|
|
"deallocated BytesIO object has exported buffers");
|
|
PyErr_Print();
|
|
}
|
|
|
|
reset(self);
|
|
|
|
Py_CLEAR(self->dict);
|
|
if (self->weakreflist != NULL)
|
|
PyObject_ClearWeakRefs((PyObject *) self);
|
|
Py_TYPE(self)->tp_free(self);
|
|
}
|
|
|
|
static PyObject *
|
|
bytesio_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
|
|
{
|
|
bytesio *self;
|
|
|
|
assert(type != NULL && type->tp_alloc != NULL);
|
|
self = (bytesio *)type->tp_alloc(type, 0);
|
|
if (self == NULL)
|
|
return NULL;
|
|
|
|
/* tp_alloc initializes all the fields to zero. So we don't have to
|
|
initialize them here. */
|
|
|
|
self->buf = (char *)PyMem_Malloc(0);
|
|
if (self->buf == NULL) {
|
|
Py_DECREF(self);
|
|
return PyErr_NoMemory();
|
|
}
|
|
|
|
return (PyObject *)self;
|
|
}
|
|
|
|
static int
|
|
bytesio_init(bytesio *self, PyObject *args, PyObject *kwds)
|
|
{
|
|
char *kwlist[] = {"initial_bytes", NULL};
|
|
PyObject *initvalue = NULL;
|
|
|
|
if (!PyArg_ParseTupleAndKeywords(args, kwds, "|O:BytesIO", kwlist,
|
|
&initvalue))
|
|
return -1;
|
|
|
|
return reinit(self, initvalue);
|
|
}
|
|
|
|
static PyObject *
|
|
bytesio_sizeof(bytesio *self, void *unused)
|
|
{
|
|
Py_ssize_t res;
|
|
|
|
res = sizeof(bytesio);
|
|
if (self->buf)
|
|
res += self->buf_size;
|
|
return PyLong_FromSsize_t(res);
|
|
}
|
|
|
|
static int
|
|
bytesio_traverse(bytesio *self, visitproc visit, void *arg)
|
|
{
|
|
Py_VISIT(self->dict);
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
bytesio_clear(bytesio *self)
|
|
{
|
|
Py_CLEAR(self->dict);
|
|
return 0;
|
|
}
|
|
|
|
|
|
static PyGetSetDef bytesio_getsetlist[] = {
|
|
{"closed", (getter)bytesio_get_closed, NULL,
|
|
"True if the file is closed."},
|
|
{NULL}, /* sentinel */
|
|
};
|
|
|
|
static struct PyMethodDef bytesio_methods[] = {
|
|
{"readable", (PyCFunction)return_not_closed, METH_NOARGS, readable_doc},
|
|
{"seekable", (PyCFunction)return_not_closed, METH_NOARGS, seekable_doc},
|
|
{"writable", (PyCFunction)return_not_closed, METH_NOARGS, writable_doc},
|
|
{"close", (PyCFunction)bytesio_close, METH_NOARGS, close_doc},
|
|
{"flush", (PyCFunction)bytesio_flush, METH_NOARGS, flush_doc},
|
|
{"isatty", (PyCFunction)bytesio_isatty, METH_NOARGS, isatty_doc},
|
|
{"tell", (PyCFunction)bytesio_tell, METH_NOARGS, tell_doc},
|
|
{"write", (PyCFunction)bytesio_write, METH_O, write_doc},
|
|
{"writelines", (PyCFunction)bytesio_writelines, METH_O, writelines_doc},
|
|
{"read1", (PyCFunction)bytesio_read1, METH_O, read1_doc},
|
|
{"readinto", (PyCFunction)bytesio_readinto, METH_O, readinto_doc},
|
|
{"readline", (PyCFunction)bytesio_readline, METH_VARARGS, readline_doc},
|
|
{"readlines", (PyCFunction)bytesio_readlines, METH_VARARGS, readlines_doc},
|
|
{"read", (PyCFunction)bytesio_read, METH_VARARGS, read_doc},
|
|
{"getbuffer", (PyCFunction)bytesio_getbuffer, METH_NOARGS, getbuffer_doc},
|
|
{"getvalue", (PyCFunction)bytesio_getvalue, METH_NOARGS, getval_doc},
|
|
{"seek", (PyCFunction)bytesio_seek, METH_VARARGS, seek_doc},
|
|
{"truncate", (PyCFunction)bytesio_truncate, METH_VARARGS, truncate_doc},
|
|
{"__getstate__", (PyCFunction)bytesio_getstate, METH_NOARGS, NULL},
|
|
{"__setstate__", (PyCFunction)bytesio_setstate, METH_O, NULL},
|
|
{"__sizeof__", (PyCFunction)bytesio_sizeof, METH_NOARGS, NULL},
|
|
{NULL, NULL} /* sentinel */
|
|
};
|
|
|
|
PyDoc_STRVAR(bytesio_doc,
|
|
"BytesIO([buffer]) -> object\n"
|
|
"\n"
|
|
"Create a buffered I/O implementation using an in-memory bytes\n"
|
|
"buffer, ready for reading and writing.");
|
|
|
|
PyTypeObject PyBytesIO_Type = {
|
|
PyVarObject_HEAD_INIT(NULL, 0)
|
|
"_io.BytesIO", /*tp_name*/
|
|
sizeof(bytesio), /*tp_basicsize*/
|
|
0, /*tp_itemsize*/
|
|
(destructor)bytesio_dealloc, /*tp_dealloc*/
|
|
0, /*tp_print*/
|
|
0, /*tp_getattr*/
|
|
0, /*tp_setattr*/
|
|
0, /*tp_reserved*/
|
|
0, /*tp_repr*/
|
|
0, /*tp_as_number*/
|
|
0, /*tp_as_sequence*/
|
|
0, /*tp_as_mapping*/
|
|
0, /*tp_hash*/
|
|
0, /*tp_call*/
|
|
0, /*tp_str*/
|
|
0, /*tp_getattro*/
|
|
0, /*tp_setattro*/
|
|
0, /*tp_as_buffer*/
|
|
Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE |
|
|
Py_TPFLAGS_HAVE_GC, /*tp_flags*/
|
|
bytesio_doc, /*tp_doc*/
|
|
(traverseproc)bytesio_traverse, /*tp_traverse*/
|
|
(inquiry)bytesio_clear, /*tp_clear*/
|
|
0, /*tp_richcompare*/
|
|
offsetof(bytesio, weakreflist), /*tp_weaklistoffset*/
|
|
PyObject_SelfIter, /*tp_iter*/
|
|
(iternextfunc)bytesio_iternext, /*tp_iternext*/
|
|
bytesio_methods, /*tp_methods*/
|
|
0, /*tp_members*/
|
|
bytesio_getsetlist, /*tp_getset*/
|
|
0, /*tp_base*/
|
|
0, /*tp_dict*/
|
|
0, /*tp_descr_get*/
|
|
0, /*tp_descr_set*/
|
|
offsetof(bytesio, dict), /*tp_dictoffset*/
|
|
(initproc)bytesio_init, /*tp_init*/
|
|
0, /*tp_alloc*/
|
|
bytesio_new, /*tp_new*/
|
|
};
|
|
|
|
|
|
/*
|
|
* Implementation of the small intermediate object used by getbuffer().
|
|
* getbuffer() returns a memoryview over this object, which should make it
|
|
* invisible from Python code.
|
|
*/
|
|
|
|
static int
|
|
bytesiobuf_getbuffer(bytesiobuf *obj, Py_buffer *view, int flags)
|
|
{
|
|
int ret;
|
|
bytesio *b = (bytesio *) obj->source;
|
|
if (view == NULL) {
|
|
b->exports++;
|
|
return 0;
|
|
}
|
|
ret = PyBuffer_FillInfo(view, (PyObject*)obj, b->buf, b->string_size,
|
|
0, flags);
|
|
if (ret >= 0) {
|
|
b->exports++;
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
static void
|
|
bytesiobuf_releasebuffer(bytesiobuf *obj, Py_buffer *view)
|
|
{
|
|
bytesio *b = (bytesio *) obj->source;
|
|
b->exports--;
|
|
}
|
|
|
|
static int
|
|
bytesiobuf_traverse(bytesiobuf *self, visitproc visit, void *arg)
|
|
{
|
|
Py_VISIT(self->source);
|
|
return 0;
|
|
}
|
|
|
|
static void
|
|
bytesiobuf_dealloc(bytesiobuf *self)
|
|
{
|
|
Py_CLEAR(self->source);
|
|
Py_TYPE(self)->tp_free(self);
|
|
}
|
|
|
|
static PyBufferProcs bytesiobuf_as_buffer = {
|
|
(getbufferproc) bytesiobuf_getbuffer,
|
|
(releasebufferproc) bytesiobuf_releasebuffer,
|
|
};
|
|
|
|
PyTypeObject _PyBytesIOBuffer_Type = {
|
|
PyVarObject_HEAD_INIT(NULL, 0)
|
|
"_io._BytesIOBuffer", /*tp_name*/
|
|
sizeof(bytesiobuf), /*tp_basicsize*/
|
|
0, /*tp_itemsize*/
|
|
(destructor)bytesiobuf_dealloc, /*tp_dealloc*/
|
|
0, /*tp_print*/
|
|
0, /*tp_getattr*/
|
|
0, /*tp_setattr*/
|
|
0, /*tp_reserved*/
|
|
0, /*tp_repr*/
|
|
0, /*tp_as_number*/
|
|
0, /*tp_as_sequence*/
|
|
0, /*tp_as_mapping*/
|
|
0, /*tp_hash*/
|
|
0, /*tp_call*/
|
|
0, /*tp_str*/
|
|
0, /*tp_getattro*/
|
|
0, /*tp_setattro*/
|
|
&bytesiobuf_as_buffer, /*tp_as_buffer*/
|
|
Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC, /*tp_flags*/
|
|
0, /*tp_doc*/
|
|
(traverseproc)bytesiobuf_traverse, /*tp_traverse*/
|
|
0, /*tp_clear*/
|
|
0, /*tp_richcompare*/
|
|
0, /*tp_weaklistoffset*/
|
|
0, /*tp_iter*/
|
|
0, /*tp_iternext*/
|
|
0, /*tp_methods*/
|
|
0, /*tp_members*/
|
|
0, /*tp_getset*/
|
|
0, /*tp_base*/
|
|
0, /*tp_dict*/
|
|
0, /*tp_descr_get*/
|
|
0, /*tp_descr_set*/
|
|
0, /*tp_dictoffset*/
|
|
0, /*tp_init*/
|
|
0, /*tp_alloc*/
|
|
0, /*tp_new*/
|
|
};
|