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Copy pathzlibmodule.c
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2253 lines (1930 loc) · 66.5 KB
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/* zlibmodule.c -- gzip-compatible data compression */
/* See http://zlib.net/ */
/* Windows users: read Python's PCbuild\readme.txt */
#ifndef Py_BUILD_CORE_BUILTIN
# define Py_BUILD_CORE_MODULE 1
#endif
#include "Python.h"
#include "zlib.h"
#include "stdbool.h"
#include <stddef.h> // offsetof()
#if defined(ZLIB_VERNUM) && ZLIB_VERNUM < 0x1221
#error "At least zlib version 1.2.2.1 is required"
#endif
#if (SIZEOF_OFF_T == SIZEOF_SIZE_T)
# define convert_to_z_off_t PyLong_AsSsize_t
#elif (SIZEOF_OFF_T == SIZEOF_LONG_LONG)
# define convert_to_z_off_t PyLong_AsLongLong
#elif (SIZEOF_OFF_T == SIZEOF_LONG)
# define convert_to_z_off_t PyLong_AsLong
#else
# error off_t does not match either size_t, long, or long long!
#endif
// Blocks output buffer wrappers
#include "pycore_blocks_output_buffer.h"
#if OUTPUT_BUFFER_MAX_BLOCK_SIZE > UINT32_MAX
#error "The maximum block size accepted by zlib is UINT32_MAX."
#endif
/* On success, return value >= 0
On failure, return -1 */
static inline Py_ssize_t
OutputBuffer_InitAndGrow(_BlocksOutputBuffer *buffer, Py_ssize_t max_length,
Bytef **next_out, uint32_t *avail_out)
{
Py_ssize_t allocated;
allocated = _BlocksOutputBuffer_InitAndGrow(
buffer, max_length, (void**) next_out);
*avail_out = (uint32_t) allocated;
return allocated;
}
/* On success, return value >= 0
On failure, return -1 */
static inline Py_ssize_t
OutputBuffer_Grow(_BlocksOutputBuffer *buffer,
Bytef **next_out, uint32_t *avail_out)
{
Py_ssize_t allocated;
allocated = _BlocksOutputBuffer_Grow(
buffer, (void**) next_out, (Py_ssize_t) *avail_out);
*avail_out = (uint32_t) allocated;
return allocated;
}
static inline Py_ssize_t
OutputBuffer_GetDataSize(_BlocksOutputBuffer *buffer, uint32_t avail_out)
{
return _BlocksOutputBuffer_GetDataSize(buffer, (Py_ssize_t) avail_out);
}
static inline PyObject *
OutputBuffer_Finish(_BlocksOutputBuffer *buffer, uint32_t avail_out)
{
return _BlocksOutputBuffer_Finish(buffer, (Py_ssize_t) avail_out);
}
static inline void
OutputBuffer_OnError(_BlocksOutputBuffer *buffer)
{
_BlocksOutputBuffer_OnError(buffer);
}
/* The max buffer size accepted by zlib is UINT32_MAX, the initial buffer size
`init_size` may > it in 64-bit build. These wrapper functions maintain an
UINT32_MAX sliding window for the first block:
1. OutputBuffer_WindowInitWithSize()
2. OutputBuffer_WindowGrow()
3. OutputBuffer_WindowFinish()
4. OutputBuffer_WindowOnError()
==== is the sliding window:
1. ====------
^ next_posi, left_bytes is 6
2. ----====--
^ next_posi, left_bytes is 2
3. --------==
^ next_posi, left_bytes is 0 */
typedef struct {
Py_ssize_t left_bytes;
Bytef *next_posi;
} _Uint32Window;
/* Initialize the buffer with an initial buffer size.
On success, return value >= 0
On failure, return value < 0 */
static inline Py_ssize_t
OutputBuffer_WindowInitWithSize(_BlocksOutputBuffer *buffer, _Uint32Window *window,
Py_ssize_t init_size,
Bytef **next_out, uint32_t *avail_out)
{
Py_ssize_t allocated = _BlocksOutputBuffer_InitWithSize(
buffer, init_size, (void**) next_out);
if (allocated >= 0) {
// the UINT32_MAX sliding window
Py_ssize_t window_size = Py_MIN((size_t)allocated, UINT32_MAX);
*avail_out = (uint32_t) window_size;
window->left_bytes = allocated - window_size;
window->next_posi = *next_out + window_size;
}
return allocated;
}
/* Grow the buffer.
On success, return value >= 0
On failure, return value < 0 */
static inline Py_ssize_t
OutputBuffer_WindowGrow(_BlocksOutputBuffer *buffer, _Uint32Window *window,
Bytef **next_out, uint32_t *avail_out)
{
Py_ssize_t allocated;
/* ensure no gaps in the data.
if inlined, this check could be optimized away.*/
if (*avail_out != 0) {
PyErr_SetString(PyExc_SystemError,
"*avail_out != 0 in OutputBuffer_WindowGrow().");
return -1;
}
// slide the UINT32_MAX sliding window
if (window->left_bytes > 0) {
Py_ssize_t window_size = Py_MIN((size_t)window->left_bytes, UINT32_MAX);
*next_out = window->next_posi;
*avail_out = (uint32_t) window_size;
window->left_bytes -= window_size;
window->next_posi += window_size;
return window_size;
}
assert(window->left_bytes == 0);
// only the first block may > UINT32_MAX
allocated = _BlocksOutputBuffer_Grow(
buffer, (void**) next_out, (Py_ssize_t) *avail_out);
*avail_out = (uint32_t) allocated;
return allocated;
}
/* Finish the buffer.
On success, return a bytes object
On failure, return NULL */
static inline PyObject *
OutputBuffer_WindowFinish(_BlocksOutputBuffer *buffer, _Uint32Window *window,
uint32_t avail_out)
{
Py_ssize_t real_avail_out = (Py_ssize_t) avail_out + window->left_bytes;
return _BlocksOutputBuffer_Finish(buffer, real_avail_out);
}
static inline void
OutputBuffer_WindowOnError(_BlocksOutputBuffer *buffer, _Uint32Window *window)
{
_BlocksOutputBuffer_OnError(buffer);
}
#define ENTER_ZLIB(obj) do { \
if (!PyThread_acquire_lock((obj)->lock, 0)) { \
Py_BEGIN_ALLOW_THREADS \
PyThread_acquire_lock((obj)->lock, 1); \
Py_END_ALLOW_THREADS \
} } while (0)
#define LEAVE_ZLIB(obj) PyThread_release_lock((obj)->lock);
/* The following parameters are copied from zutil.h, version 0.95 */
#define DEFLATED 8
#if MAX_MEM_LEVEL >= 8
# define DEF_MEM_LEVEL 8
#else
# define DEF_MEM_LEVEL MAX_MEM_LEVEL
#endif
/* Initial buffer size. */
#define DEF_BUF_SIZE (16*1024)
#define DEF_MAX_INITIAL_BUF_SIZE (16 * 1024 * 1024)
static PyModuleDef zlibmodule;
typedef struct {
PyTypeObject *Comptype;
PyTypeObject *Decomptype;
PyTypeObject *ZlibDecompressorType;
PyObject *ZlibError;
} zlibstate;
static inline zlibstate*
get_zlib_state(PyObject *module)
{
void *state = PyModule_GetState(module);
assert(state != NULL);
return (zlibstate *)state;
}
typedef struct
{
PyObject_HEAD
z_stream zst;
PyObject *unused_data;
PyObject *unconsumed_tail;
char eof;
bool is_initialised;
PyObject *zdict;
PyThread_type_lock lock;
} compobject;
#define _compobject_CAST(op) ((compobject *)op)
static void
zlib_error(zlibstate *state, z_stream zst, int err, const char *msg)
{
const char *zmsg = Z_NULL;
/* In case of a version mismatch, zst.msg won't be initialized.
Check for this case first, before looking at zst.msg. */
if (err == Z_VERSION_ERROR)
zmsg = "library version mismatch";
if (zmsg == Z_NULL)
zmsg = zst.msg;
if (zmsg == Z_NULL) {
switch (err) {
case Z_BUF_ERROR:
zmsg = "incomplete or truncated stream";
break;
case Z_STREAM_ERROR:
zmsg = "inconsistent stream state";
break;
case Z_DATA_ERROR:
zmsg = "invalid input data";
break;
}
}
if (zmsg == Z_NULL)
PyErr_Format(state->ZlibError, "Error %d %s", err, msg);
else
PyErr_Format(state->ZlibError, "Error %d %s: %.200s", err, msg, zmsg);
}
/*[clinic input]
module zlib
class zlib.Compress "compobject *" "&Comptype"
class zlib.Decompress "compobject *" "&Decomptype"
[clinic start generated code]*/
/*[clinic end generated code: output=da39a3ee5e6b4b0d input=093935115c3e3158]*/
static compobject *
newcompobject(PyTypeObject *type)
{
compobject *self;
assert(type != NULL);
assert(type->tp_alloc != NULL);
self = _compobject_CAST(type->tp_alloc(type, 0));
if (self == NULL)
return NULL;
self->eof = 0;
self->is_initialised = 0;
self->zdict = NULL;
self->unused_data = Py_GetConstant(Py_CONSTANT_EMPTY_BYTES);
if (self->unused_data == NULL) {
Py_DECREF(self);
return NULL;
}
self->unconsumed_tail = Py_GetConstant(Py_CONSTANT_EMPTY_BYTES);
if (self->unconsumed_tail == NULL) {
Py_DECREF(self);
return NULL;
}
self->lock = PyThread_allocate_lock();
if (self->lock == NULL) {
Py_DECREF(self);
PyErr_SetString(PyExc_MemoryError, "Unable to allocate lock");
return NULL;
}
return self;
}
static void*
PyZlib_Malloc(voidpf ctx, uInt items, uInt size)
{
if (size != 0 && items > (size_t)PY_SSIZE_T_MAX / size)
return NULL;
/* PyMem_Malloc() cannot be used: the GIL is not held when
inflate() and deflate() are called */
return PyMem_RawMalloc((size_t)items * (size_t)size);
}
static void
PyZlib_Free(voidpf ctx, void *ptr)
{
PyMem_RawFree(ptr);
}
static void
arrange_input_buffer(z_stream *zst, Py_ssize_t *remains)
{
zst->avail_in = (uInt)Py_MIN((size_t)*remains, UINT_MAX);
*remains -= zst->avail_in;
}
/*[clinic input]
zlib.compress
data: Py_buffer
Binary data to be compressed.
/
level: int(c_default="Z_DEFAULT_COMPRESSION") = Z_DEFAULT_COMPRESSION
Compression level, in 0-9 or -1.
wbits: int(c_default="MAX_WBITS") = MAX_WBITS
The window buffer size and container format.
Returns a bytes object containing compressed data.
[clinic start generated code]*/
static PyObject *
zlib_compress_impl(PyObject *module, Py_buffer *data, int level, int wbits)
/*[clinic end generated code: output=46bd152fadd66df2 input=c4d06ee5782a7e3f]*/
{
PyObject *return_value;
int flush;
z_stream zst;
_BlocksOutputBuffer buffer = {.writer = NULL};
zlibstate *state = get_zlib_state(module);
Byte *ibuf = data->buf;
Py_ssize_t ibuflen = data->len;
if (OutputBuffer_InitAndGrow(&buffer, -1, &zst.next_out, &zst.avail_out) < 0) {
goto error;
}
zst.opaque = NULL;
zst.zalloc = PyZlib_Malloc;
zst.zfree = PyZlib_Free;
zst.next_in = ibuf;
int err = deflateInit2(&zst, level, DEFLATED, wbits, DEF_MEM_LEVEL,
Z_DEFAULT_STRATEGY);
switch (err) {
case Z_OK:
break;
case Z_MEM_ERROR:
PyErr_SetString(PyExc_MemoryError,
"Out of memory while compressing data");
goto error;
case Z_STREAM_ERROR:
PyErr_SetString(state->ZlibError, "Bad compression level");
goto error;
default:
deflateEnd(&zst);
zlib_error(state, zst, err, "while compressing data");
goto error;
}
do {
arrange_input_buffer(&zst, &ibuflen);
flush = ibuflen == 0 ? Z_FINISH : Z_NO_FLUSH;
do {
if (zst.avail_out == 0) {
if (OutputBuffer_Grow(&buffer, &zst.next_out, &zst.avail_out) < 0) {
deflateEnd(&zst);
goto error;
}
}
Py_BEGIN_ALLOW_THREADS
err = deflate(&zst, flush);
Py_END_ALLOW_THREADS
if (err == Z_STREAM_ERROR) {
deflateEnd(&zst);
zlib_error(state, zst, err, "while compressing data");
goto error;
}
} while (zst.avail_out == 0);
assert(zst.avail_in == 0);
} while (flush != Z_FINISH);
assert(err == Z_STREAM_END);
err = deflateEnd(&zst);
if (err == Z_OK) {
return_value = OutputBuffer_Finish(&buffer, zst.avail_out);
if (return_value == NULL) {
goto error;
}
return return_value;
}
else
zlib_error(state, zst, err, "while finishing compression");
error:
OutputBuffer_OnError(&buffer);
return NULL;
}
/*[clinic input]
zlib.decompress
data: Py_buffer
Compressed data.
/
wbits: int(c_default="MAX_WBITS") = MAX_WBITS
The window buffer size and container format.
bufsize: Py_ssize_t(c_default="DEF_BUF_SIZE", allow_negative=False) = DEF_BUF_SIZE
The initial output buffer size.
Returns a bytes object containing the uncompressed data.
[clinic start generated code]*/
static PyObject *
zlib_decompress_impl(PyObject *module, Py_buffer *data, int wbits,
Py_ssize_t bufsize)
/*[clinic end generated code: output=77c7e35111dc8c42 input=530077065b3a2233]*/
{
PyObject *return_value;
Byte *ibuf;
Py_ssize_t ibuflen;
int err, flush;
z_stream zst;
_BlocksOutputBuffer buffer = {.writer = NULL};
_Uint32Window window; // output buffer's UINT32_MAX sliding window
zlibstate *state = get_zlib_state(module);
if (bufsize == 0) {
bufsize = 1;
}
if (OutputBuffer_WindowInitWithSize(&buffer, &window, bufsize,
&zst.next_out, &zst.avail_out) < 0) {
goto error;
}
ibuf = data->buf;
ibuflen = data->len;
zst.opaque = NULL;
zst.zalloc = PyZlib_Malloc;
zst.zfree = PyZlib_Free;
zst.avail_in = 0;
zst.next_in = ibuf;
err = inflateInit2(&zst, wbits);
switch (err) {
case Z_OK:
break;
case Z_MEM_ERROR:
PyErr_SetString(PyExc_MemoryError,
"Out of memory while decompressing data");
goto error;
default:
inflateEnd(&zst);
zlib_error(state, zst, err, "while preparing to decompress data");
goto error;
}
do {
arrange_input_buffer(&zst, &ibuflen);
flush = ibuflen == 0 ? Z_FINISH : Z_NO_FLUSH;
do {
if (zst.avail_out == 0) {
if (OutputBuffer_WindowGrow(&buffer, &window,
&zst.next_out, &zst.avail_out) < 0) {
inflateEnd(&zst);
goto error;
}
}
Py_BEGIN_ALLOW_THREADS
err = inflate(&zst, flush);
Py_END_ALLOW_THREADS
switch (err) {
case Z_OK: _Py_FALLTHROUGH;
case Z_BUF_ERROR: _Py_FALLTHROUGH;
case Z_STREAM_END:
break;
case Z_MEM_ERROR:
inflateEnd(&zst);
PyErr_SetString(PyExc_MemoryError,
"Out of memory while decompressing data");
goto error;
default:
inflateEnd(&zst);
zlib_error(state, zst, err, "while decompressing data");
goto error;
}
} while (zst.avail_out == 0);
} while (err != Z_STREAM_END && ibuflen != 0);
if (err != Z_STREAM_END) {
inflateEnd(&zst);
zlib_error(state, zst, err, "while decompressing data");
goto error;
}
err = inflateEnd(&zst);
if (err != Z_OK) {
zlib_error(state, zst, err, "while finishing decompression");
goto error;
}
return_value = OutputBuffer_WindowFinish(&buffer, &window, zst.avail_out);
if (return_value != NULL) {
return return_value;
}
error:
OutputBuffer_WindowOnError(&buffer, &window);
return NULL;
}
/*[clinic input]
zlib.compressobj
level: int(c_default="Z_DEFAULT_COMPRESSION") = Z_DEFAULT_COMPRESSION
The compression level (an integer in the range 0-9 or -1; default is
currently equivalent to 6). Higher compression levels are slower,
but produce smaller results.
method: int(c_default="DEFLATED") = DEFLATED
The compression algorithm. If given, this must be DEFLATED.
wbits: int(c_default="MAX_WBITS") = MAX_WBITS
+9 to +15: The base-two logarithm of the window size. Include a zlib
container.
-9 to -15: Generate a raw stream.
+25 to +31: Include a gzip container.
memLevel: int(c_default="DEF_MEM_LEVEL") = DEF_MEM_LEVEL
Controls the amount of memory used for internal compression state.
Valid values range from 1 to 9. Higher values result in higher memory
usage, faster compression, and smaller output.
strategy: int(c_default="Z_DEFAULT_STRATEGY") = Z_DEFAULT_STRATEGY
Used to tune the compression algorithm. Possible values are
Z_DEFAULT_STRATEGY, Z_FILTERED, and Z_HUFFMAN_ONLY.
zdict: Py_buffer = None
The predefined compression dictionary - a sequence of bytes
containing subsequences that are likely to occur in the input data.
Return a compressor object.
[clinic start generated code]*/
static PyObject *
zlib_compressobj_impl(PyObject *module, int level, int method, int wbits,
int memLevel, int strategy, Py_buffer *zdict)
/*[clinic end generated code: output=8b5bed9c8fc3814d input=2fa3d026f90ab8d5]*/
{
zlibstate *state = get_zlib_state(module);
if (zdict->buf != NULL && (size_t)zdict->len > UINT_MAX) {
PyErr_SetString(PyExc_OverflowError,
"zdict length does not fit in an unsigned int");
return NULL;
}
compobject *self = newcompobject(state->Comptype);
if (self == NULL)
goto error;
self->zst.opaque = NULL;
self->zst.zalloc = PyZlib_Malloc;
self->zst.zfree = PyZlib_Free;
self->zst.next_in = NULL;
self->zst.avail_in = 0;
int err = deflateInit2(&self->zst, level, method, wbits, memLevel, strategy);
switch (err) {
case Z_OK:
self->is_initialised = 1;
if (zdict->buf == NULL) {
goto success;
} else {
err = deflateSetDictionary(&self->zst,
zdict->buf, (unsigned int)zdict->len);
switch (err) {
case Z_OK:
goto success;
case Z_STREAM_ERROR:
PyErr_SetString(PyExc_ValueError, "Invalid dictionary");
goto error;
default:
PyErr_SetString(PyExc_ValueError, "deflateSetDictionary()");
goto error;
}
}
case Z_MEM_ERROR:
PyErr_SetString(PyExc_MemoryError,
"Can't allocate memory for compression object");
goto error;
case Z_STREAM_ERROR:
PyErr_SetString(PyExc_ValueError, "Invalid initialization option");
goto error;
default:
zlib_error(state, self->zst, err, "while creating compression object");
goto error;
}
error:
Py_CLEAR(self);
success:
return (PyObject *)self;
}
static int
set_inflate_zdict(zlibstate *state, compobject *self)
{
Py_buffer zdict_buf;
if (PyObject_GetBuffer(self->zdict, &zdict_buf, PyBUF_SIMPLE) == -1) {
return -1;
}
if ((size_t)zdict_buf.len > UINT_MAX) {
PyErr_SetString(PyExc_OverflowError,
"zdict length does not fit in an unsigned int");
PyBuffer_Release(&zdict_buf);
return -1;
}
int err;
err = inflateSetDictionary(&self->zst,
zdict_buf.buf, (unsigned int)zdict_buf.len);
PyBuffer_Release(&zdict_buf);
if (err != Z_OK) {
zlib_error(state, self->zst, err, "while setting zdict");
return -1;
}
return 0;
}
/*[clinic input]
zlib.decompressobj
wbits: int(c_default="MAX_WBITS") = MAX_WBITS
The window buffer size and container format.
zdict: object(c_default="NULL") = b''
The predefined compression dictionary. This must be the same
dictionary as used by the compressor that produced the input data.
Return a decompressor object.
[clinic start generated code]*/
static PyObject *
zlib_decompressobj_impl(PyObject *module, int wbits, PyObject *zdict)
/*[clinic end generated code: output=3069b99994f36906 input=d3832b8511fc977b]*/
{
zlibstate *state = get_zlib_state(module);
if (zdict != NULL && !PyObject_CheckBuffer(zdict)) {
PyErr_SetString(PyExc_TypeError,
"zdict argument must support the buffer protocol");
return NULL;
}
compobject *self = newcompobject(state->Decomptype);
if (self == NULL)
return NULL;
self->zst.opaque = NULL;
self->zst.zalloc = PyZlib_Malloc;
self->zst.zfree = PyZlib_Free;
self->zst.next_in = NULL;
self->zst.avail_in = 0;
if (zdict != NULL) {
self->zdict = Py_NewRef(zdict);
}
int err = inflateInit2(&self->zst, wbits);
switch (err) {
case Z_OK:
self->is_initialised = 1;
if (self->zdict != NULL && wbits < 0) {
if (set_inflate_zdict(state, self) < 0) {
Py_DECREF(self);
return NULL;
}
}
return (PyObject *)self;
case Z_STREAM_ERROR:
Py_DECREF(self);
PyErr_SetString(PyExc_ValueError, "Invalid initialization option");
return NULL;
case Z_MEM_ERROR:
Py_DECREF(self);
PyErr_SetString(PyExc_MemoryError,
"Can't allocate memory for decompression object");
return NULL;
default:
zlib_error(state, self->zst, err, "while creating decompression object");
Py_DECREF(self);
return NULL;
}
}
static void
compobject_dealloc_impl(PyObject *op, int (*dealloc)(z_streamp))
{
PyTypeObject *type = Py_TYPE(op);
PyObject_GC_UnTrack(op);
compobject *self = _compobject_CAST(op);
if (self->is_initialised) {
(void)dealloc(&self->zst);
}
PyThread_free_lock(self->lock);
Py_XDECREF(self->unused_data);
Py_XDECREF(self->unconsumed_tail);
Py_XDECREF(self->zdict);
type->tp_free(self);
Py_DECREF(type);
}
static int
compobject_traverse(PyObject *op, visitproc visit, void *arg)
{
compobject *self = _compobject_CAST(op);
Py_VISIT(Py_TYPE(op));
Py_VISIT(self->zdict);
return 0;
}
static void
Comp_dealloc(PyObject *op)
{
compobject_dealloc_impl(op, &deflateEnd);
}
static void
Decomp_dealloc(PyObject *op)
{
compobject_dealloc_impl(op, &inflateEnd);
}
/*[clinic input]
zlib.Compress.compress
cls: defining_class
data: Py_buffer
Binary data to be compressed.
/
Returns a bytes object containing compressed data.
After calling this function, some of the input data may still
be stored in internal buffers for later processing.
Call the flush() method to clear these buffers.
[clinic start generated code]*/
static PyObject *
zlib_Compress_compress_impl(compobject *self, PyTypeObject *cls,
Py_buffer *data)
/*[clinic end generated code: output=6731b3f0ff357ca6 input=04d00f65ab01d260]*/
{
PyObject *return_value;
int err;
_BlocksOutputBuffer buffer = {.writer = NULL};
zlibstate *state = PyType_GetModuleState(cls);
ENTER_ZLIB(self);
self->zst.next_in = data->buf;
Py_ssize_t ibuflen = data->len;
if (OutputBuffer_InitAndGrow(&buffer, -1, &self->zst.next_out, &self->zst.avail_out) < 0) {
goto error;
}
do {
arrange_input_buffer(&self->zst, &ibuflen);
do {
if (self->zst.avail_out == 0) {
if (OutputBuffer_Grow(&buffer, &self->zst.next_out, &self->zst.avail_out) < 0) {
goto error;
}
}
Py_BEGIN_ALLOW_THREADS
err = deflate(&self->zst, Z_NO_FLUSH);
Py_END_ALLOW_THREADS
if (err == Z_STREAM_ERROR) {
zlib_error(state, self->zst, err, "while compressing data");
goto error;
}
} while (self->zst.avail_out == 0);
assert(self->zst.avail_in == 0);
} while (ibuflen != 0);
return_value = OutputBuffer_Finish(&buffer, self->zst.avail_out);
if (return_value != NULL) {
goto success;
}
error:
OutputBuffer_OnError(&buffer);
return_value = NULL;
success:
LEAVE_ZLIB(self);
return return_value;
}
/* Helper for objdecompress() and flush(). Saves any unconsumed input data in
self->unused_data or self->unconsumed_tail, as appropriate. */
static int
save_unconsumed_input(compobject *self, Py_buffer *data, int err)
{
if (err == Z_STREAM_END) {
/* The end of the compressed data has been reached. Store the leftover
input data in self->unused_data. */
if (self->zst.avail_in > 0) {
Py_ssize_t old_size = PyBytes_GET_SIZE(self->unused_data);
Py_ssize_t left_size;
left_size = (Byte *)data->buf + data->len - self->zst.next_in;
if (left_size > (PY_SSIZE_T_MAX - old_size)) {
PyErr_NoMemory();
return -1;
}
PyBytesWriter *writer = PyBytesWriter_Create(old_size + left_size);
if (writer == NULL) {
return -1;
}
char *new_data = PyBytesWriter_GetData(writer);
memcpy(new_data, PyBytes_AS_STRING(self->unused_data), old_size);
memcpy(new_data + old_size, self->zst.next_in, left_size);
PyObject *new_unused_data = PyBytesWriter_Finish(writer);
if (new_unused_data == NULL) {
return -1;
}
Py_SETREF(self->unused_data, new_unused_data);
self->zst.avail_in = 0;
}
}
if (self->zst.avail_in > 0 || PyBytes_GET_SIZE(self->unconsumed_tail)) {
/* This code handles two distinct cases:
1. Output limit was reached. Save leftover input in unconsumed_tail.
2. All input data was consumed. Clear unconsumed_tail. */
Py_ssize_t left_size = (Byte *)data->buf + data->len - self->zst.next_in;
PyObject *new_data = PyBytes_FromStringAndSize(
(char *)self->zst.next_in, left_size);
if (new_data == NULL)
return -1;
Py_SETREF(self->unconsumed_tail, new_data);
}
return 0;
}
/*[clinic input]
@permit_long_docstring_body
zlib.Decompress.decompress
cls: defining_class
data: Py_buffer
The binary data to decompress.
/
max_length: Py_ssize_t(allow_negative=False) = 0
The maximum allowable length of the decompressed data.
Unconsumed input data will be stored in
the unconsumed_tail attribute.
Return a bytes object containing the decompressed version of the data.
After calling this function, some of the input data may still be stored in
internal buffers for later processing.
Call the flush() method to clear these buffers.
[clinic start generated code]*/
static PyObject *
zlib_Decompress_decompress_impl(compobject *self, PyTypeObject *cls,
Py_buffer *data, Py_ssize_t max_length)
/*[clinic end generated code: output=b024a93c2c922d57 input=77de124bd2a2ecc0]*/
{
int err = Z_OK;
Py_ssize_t ibuflen;
PyObject *return_value;
_BlocksOutputBuffer buffer = {.writer = NULL};
PyObject *module = PyType_GetModule(cls);
if (module == NULL)
return NULL;
zlibstate *state = get_zlib_state(module);
if (max_length == 0) {
max_length = -1;
}
ENTER_ZLIB(self);
self->zst.next_in = data->buf;
ibuflen = data->len;
if (OutputBuffer_InitAndGrow(&buffer, max_length, &self->zst.next_out, &self->zst.avail_out) < 0) {
goto abort;
}
do {
arrange_input_buffer(&self->zst, &ibuflen);
do {
if (self->zst.avail_out == 0) {
if (OutputBuffer_GetDataSize(&buffer, self->zst.avail_out) == max_length) {
goto save;
}
if (OutputBuffer_Grow(&buffer, &self->zst.next_out, &self->zst.avail_out) < 0) {
goto abort;
}
}
Py_BEGIN_ALLOW_THREADS
err = inflate(&self->zst, Z_SYNC_FLUSH);
Py_END_ALLOW_THREADS
switch (err) {
case Z_OK: _Py_FALLTHROUGH;
case Z_BUF_ERROR: _Py_FALLTHROUGH;
case Z_STREAM_END:
break;
default:
if (err == Z_NEED_DICT && self->zdict != NULL) {
if (set_inflate_zdict(state, self) < 0) {
goto abort;
}
else
break;
}
goto save;
}
} while (self->zst.avail_out == 0 || err == Z_NEED_DICT);
} while (err != Z_STREAM_END && ibuflen != 0);
save:
if (save_unconsumed_input(self, data, err) < 0)
goto abort;
if (err == Z_STREAM_END) {
/* This is the logical place to call inflateEnd, but the old behaviour
of only calling it on flush() is preserved. */
self->eof = 1;
} else if (err != Z_OK && err != Z_BUF_ERROR) {
/* We will only get Z_BUF_ERROR if the output buffer was full
but there wasn't more output when we tried again, so it is
not an error condition.
*/
zlib_error(state, self->zst, err, "while decompressing data");
goto abort;
}
return_value = OutputBuffer_Finish(&buffer, self->zst.avail_out);
if (return_value != NULL) {
goto success;
}
abort:
OutputBuffer_OnError(&buffer);
return_value = NULL;
success:
LEAVE_ZLIB(self);
return return_value;
}
/*[clinic input]
zlib.Compress.flush
cls: defining_class
mode: int(c_default="Z_FINISH") = zlib.Z_FINISH
One of the constants Z_SYNC_FLUSH, Z_FULL_FLUSH, Z_FINISH.
If mode == Z_FINISH, the compressor object can no longer be
used after calling the flush() method. Otherwise, more data
can still be compressed.
/
Return a bytes object containing any remaining compressed data.
[clinic start generated code]*/