| /* zlibmodule.c -- gzip-compatible data compression */ |
| /* See http://www.gzip.org/zlib/ */ |
| |
| /* Windows users: read Python's PCbuild\readme.txt */ |
| |
| |
| #include "Python.h" |
| #include "structmember.h" |
| #include "zlib.h" |
| |
| |
| #ifdef WITH_THREAD |
| #include "pythread.h" |
| #define ENTER_ZLIB(obj) \ |
| Py_BEGIN_ALLOW_THREADS; \ |
| PyThread_acquire_lock((obj)->lock, 1); \ |
| Py_END_ALLOW_THREADS; |
| #define LEAVE_ZLIB(obj) PyThread_release_lock((obj)->lock); |
| #else |
| #define ENTER_ZLIB(obj) |
| #define LEAVE_ZLIB(obj) |
| #endif |
| |
| /* 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 |
| #define DEF_WBITS MAX_WBITS |
| |
| /* The output buffer will be increased in chunks of DEFAULTALLOC bytes. */ |
| #define DEFAULTALLOC (16*1024) |
| |
| static PyTypeObject Comptype; |
| static PyTypeObject Decomptype; |
| |
| static PyObject *ZlibError; |
| |
| typedef struct |
| { |
| PyObject_HEAD |
| z_stream zst; |
| PyObject *unused_data; |
| PyObject *unconsumed_tail; |
| char eof; |
| int is_initialised; |
| PyObject *zdict; |
| #ifdef WITH_THREAD |
| PyThread_type_lock lock; |
| #endif |
| } compobject; |
| |
| static void |
| zlib_error(z_stream zst, int err, 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(ZlibError, "Error %d %s", err, msg); |
| else |
| PyErr_Format(ZlibError, "Error %d %s: %.200s", err, msg, zmsg); |
| } |
| |
| /*[clinic] |
| module zlib |
| class zlib.Compress |
| class zlib.Decompress |
| [clinic]*/ |
| /*[clinic checksum: da39a3ee5e6b4b0d3255bfef95601890afd80709]*/ |
| |
| PyDoc_STRVAR(compressobj__doc__, |
| "compressobj(level=-1, method=DEFLATED, wbits=15, memlevel=8,\n" |
| " strategy=Z_DEFAULT_STRATEGY[, zdict])\n" |
| " -- Return a compressor object.\n" |
| "\n" |
| "level is the compression level (an integer in the range 0-9; default is 6).\n" |
| "Higher compression levels are slower, but produce smaller results.\n" |
| "\n" |
| "method is the compression algorithm. If given, this must be DEFLATED.\n" |
| "\n" |
| "wbits is the base two logarithm of the window size (range: 8..15).\n" |
| "\n" |
| "memlevel controls the amount of memory used for internal compression state.\n" |
| "Valid values range from 1 to 9. Higher values result in higher memory usage,\n" |
| "faster compression, and smaller output.\n" |
| "\n" |
| "strategy is used to tune the compression algorithm. Possible values are\n" |
| "Z_DEFAULT_STRATEGY, Z_FILTERED, and Z_HUFFMAN_ONLY.\n" |
| "\n" |
| "zdict is the predefined compression dictionary - a sequence of bytes\n" |
| "containing subsequences that are likely to occur in the input data."); |
| |
| PyDoc_STRVAR(decompressobj__doc__, |
| "decompressobj([wbits[, zdict]]) -- Return a decompressor object.\n" |
| "\n" |
| "Optional arg wbits is the window buffer size.\n" |
| "\n" |
| "Optional arg zdict is the predefined compression dictionary. This must be\n" |
| "the same dictionary as used by the compressor that produced the input data."); |
| |
| static compobject * |
| newcompobject(PyTypeObject *type) |
| { |
| compobject *self; |
| self = PyObject_New(compobject, type); |
| if (self == NULL) |
| return NULL; |
| self->eof = 0; |
| self->is_initialised = 0; |
| self->zdict = NULL; |
| self->unused_data = PyBytes_FromStringAndSize("", 0); |
| if (self->unused_data == NULL) { |
| Py_DECREF(self); |
| return NULL; |
| } |
| self->unconsumed_tail = PyBytes_FromStringAndSize("", 0); |
| if (self->unconsumed_tail == NULL) { |
| Py_DECREF(self); |
| return NULL; |
| } |
| #ifdef WITH_THREAD |
| self->lock = PyThread_allocate_lock(); |
| if (self->lock == NULL) { |
| PyErr_SetString(PyExc_MemoryError, "Unable to allocate lock"); |
| return NULL; |
| } |
| #endif |
| return self; |
| } |
| |
| static void* |
| PyZlib_Malloc(voidpf ctx, uInt items, uInt size) |
| { |
| if (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(items * size); |
| } |
| |
| static void |
| PyZlib_Free(voidpf ctx, void *ptr) |
| { |
| PyMem_RawFree(ptr); |
| } |
| |
| /*[clinic] |
| |
| zlib.compress |
| bytes: Py_buffer |
| Binary data to be compressed. |
| [ |
| level: int |
| Compression level, in 0-9. |
| ] |
| / |
| |
| Returns compressed string. |
| |
| [clinic]*/ |
| |
| PyDoc_STRVAR(zlib_compress__doc__, |
| "compress(bytes, [level])\n" |
| "Returns compressed string.\n" |
| "\n" |
| " bytes\n" |
| " Binary data to be compressed.\n" |
| " level\n" |
| " Compression level, in 0-9."); |
| |
| #define ZLIB_COMPRESS_METHODDEF \ |
| {"compress", (PyCFunction)zlib_compress, METH_VARARGS, zlib_compress__doc__}, |
| |
| static PyObject * |
| zlib_compress_impl(PyModuleDef *module, Py_buffer *bytes, int group_right_1, int level); |
| |
| static PyObject * |
| zlib_compress(PyModuleDef *module, PyObject *args) |
| { |
| PyObject *return_value = NULL; |
| Py_buffer bytes = {NULL, NULL, 0, 0, 0, 0, NULL, NULL, NULL, NULL, NULL}; |
| int group_right_1 = 0; |
| int level = 0; |
| |
| switch (PyTuple_Size(args)) { |
| case 1: |
| if (!PyArg_ParseTuple(args, "y*:compress", &bytes)) |
| return NULL; |
| break; |
| case 2: |
| if (!PyArg_ParseTuple(args, "y*i:compress", &bytes, &level)) |
| return NULL; |
| group_right_1 = 1; |
| break; |
| default: |
| PyErr_SetString(PyExc_TypeError, "zlib.compress requires 1 to 2 arguments"); |
| return NULL; |
| } |
| return_value = zlib_compress_impl(module, &bytes, group_right_1, level); |
| |
| /* Cleanup for bytes */ |
| if (bytes.buf) |
| PyBuffer_Release(&bytes); |
| |
| return return_value; |
| } |
| |
| static PyObject * |
| zlib_compress_impl(PyModuleDef *module, Py_buffer *bytes, int group_right_1, int level) |
| /*[clinic checksum: 9f055a396620bc1a8a13d74c3496249528b32b0d]*/ |
| { |
| PyObject *ReturnVal = NULL; |
| Byte *input, *output = NULL; |
| unsigned int length; |
| int err; |
| z_stream zst; |
| |
| if (!group_right_1) |
| level = Z_DEFAULT_COMPRESSION; |
| |
| if ((size_t)bytes->len > UINT_MAX) { |
| PyErr_SetString(PyExc_OverflowError, |
| "Size does not fit in an unsigned int"); |
| goto error; |
| } |
| input = bytes->buf; |
| length = (unsigned int)bytes->len; |
| |
| zst.avail_out = length + length/1000 + 12 + 1; |
| |
| output = (Byte*)PyMem_Malloc(zst.avail_out); |
| if (output == NULL) { |
| PyErr_SetString(PyExc_MemoryError, |
| "Can't allocate memory to compress data"); |
| goto error; |
| } |
| |
| /* Past the point of no return. From here on out, we need to make sure |
| we clean up mallocs & INCREFs. */ |
| |
| zst.opaque = NULL; |
| zst.zalloc = PyZlib_Malloc; |
| zst.zfree = PyZlib_Free; |
| zst.next_out = (Byte *)output; |
| zst.next_in = (Byte *)input; |
| zst.avail_in = length; |
| err = deflateInit(&zst, level); |
| |
| 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(ZlibError, |
| "Bad compression level"); |
| goto error; |
| default: |
| deflateEnd(&zst); |
| zlib_error(zst, err, "while compressing data"); |
| goto error; |
| } |
| |
| Py_BEGIN_ALLOW_THREADS; |
| err = deflate(&zst, Z_FINISH); |
| Py_END_ALLOW_THREADS; |
| |
| if (err != Z_STREAM_END) { |
| zlib_error(zst, err, "while compressing data"); |
| deflateEnd(&zst); |
| goto error; |
| } |
| |
| err=deflateEnd(&zst); |
| if (err == Z_OK) |
| ReturnVal = PyBytes_FromStringAndSize((char *)output, |
| zst.total_out); |
| else |
| zlib_error(zst, err, "while finishing compression"); |
| |
| error: |
| PyMem_Free(output); |
| |
| return ReturnVal; |
| } |
| |
| /*[python] |
| |
| class uint_converter(CConverter): |
| type = 'unsigned int' |
| converter = 'uint_converter' |
| |
| [python]*/ |
| /*[python checksum: da39a3ee5e6b4b0d3255bfef95601890afd80709]*/ |
| |
| static int |
| uint_converter(PyObject *obj, void *ptr) |
| { |
| long val; |
| unsigned long uval; |
| |
| val = PyLong_AsLong(obj); |
| if (val == -1 && PyErr_Occurred()) { |
| uval = PyLong_AsUnsignedLong(obj); |
| if (uval == (unsigned long)-1 && PyErr_Occurred()) |
| return 0; |
| } |
| else { |
| if (val < 0) { |
| PyErr_SetString(PyExc_ValueError, |
| "value must be positive"); |
| return 0; |
| } |
| uval = (unsigned long)val; |
| } |
| |
| if (uval > UINT_MAX) { |
| PyErr_SetString(PyExc_OverflowError, |
| "Python int too large for C unsigned int"); |
| return 0; |
| } |
| |
| *(unsigned int *)ptr = Py_SAFE_DOWNCAST(uval, unsigned long, unsigned int); |
| return 1; |
| } |
| |
| PyDoc_STRVAR(decompress__doc__, |
| "decompress(string[, wbits[, bufsize]]) -- Return decompressed string.\n" |
| "\n" |
| "Optional arg wbits is the window buffer size. Optional arg bufsize is\n" |
| "the initial output buffer size."); |
| |
| static PyObject * |
| PyZlib_decompress(PyObject *self, PyObject *args) |
| { |
| PyObject *result_str = NULL; |
| Py_buffer pinput; |
| Byte *input; |
| unsigned int length; |
| int err; |
| int wsize=DEF_WBITS; |
| unsigned int bufsize = DEFAULTALLOC, new_bufsize; |
| z_stream zst; |
| |
| if (!PyArg_ParseTuple(args, "y*|iO&:decompress", |
| &pinput, &wsize, uint_converter, &bufsize)) |
| return NULL; |
| |
| if ((size_t)pinput.len > UINT_MAX) { |
| PyErr_SetString(PyExc_OverflowError, |
| "Size does not fit in an unsigned int"); |
| goto error; |
| } |
| input = pinput.buf; |
| length = (unsigned int)pinput.len; |
| |
| if (bufsize == 0) |
| bufsize = 1; |
| |
| zst.avail_in = length; |
| zst.avail_out = bufsize; |
| |
| if (!(result_str = PyBytes_FromStringAndSize(NULL, bufsize))) |
| goto error; |
| |
| zst.opaque = NULL; |
| zst.zalloc = PyZlib_Malloc; |
| zst.zfree = PyZlib_Free; |
| zst.next_out = (Byte *)PyBytes_AS_STRING(result_str); |
| zst.next_in = (Byte *)input; |
| err = inflateInit2(&zst, wsize); |
| |
| 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(zst, err, "while preparing to decompress data"); |
| goto error; |
| } |
| |
| do { |
| Py_BEGIN_ALLOW_THREADS |
| err=inflate(&zst, Z_FINISH); |
| Py_END_ALLOW_THREADS |
| |
| switch(err) { |
| case(Z_STREAM_END): |
| break; |
| case(Z_BUF_ERROR): |
| /* |
| * If there is at least 1 byte of room according to zst.avail_out |
| * and we get this error, assume that it means zlib cannot |
| * process the inflate call() due to an error in the data. |
| */ |
| if (zst.avail_out > 0) { |
| zlib_error(zst, err, "while decompressing data"); |
| inflateEnd(&zst); |
| goto error; |
| } |
| /* fall through */ |
| case(Z_OK): |
| /* need more memory */ |
| if (bufsize <= (UINT_MAX >> 1)) |
| new_bufsize = bufsize << 1; |
| else |
| new_bufsize = UINT_MAX; |
| if (_PyBytes_Resize(&result_str, new_bufsize) < 0) { |
| inflateEnd(&zst); |
| goto error; |
| } |
| zst.next_out = |
| (unsigned char *)PyBytes_AS_STRING(result_str) + bufsize; |
| zst.avail_out = bufsize; |
| bufsize = new_bufsize; |
| break; |
| default: |
| inflateEnd(&zst); |
| zlib_error(zst, err, "while decompressing data"); |
| goto error; |
| } |
| } while (err != Z_STREAM_END); |
| |
| err = inflateEnd(&zst); |
| if (err != Z_OK) { |
| zlib_error(zst, err, "while finishing decompression"); |
| goto error; |
| } |
| |
| if (_PyBytes_Resize(&result_str, zst.total_out) < 0) |
| goto error; |
| |
| PyBuffer_Release(&pinput); |
| return result_str; |
| |
| error: |
| PyBuffer_Release(&pinput); |
| Py_XDECREF(result_str); |
| return NULL; |
| } |
| |
| static PyObject * |
| PyZlib_compressobj(PyObject *selfptr, PyObject *args, PyObject *kwargs) |
| { |
| compobject *self = NULL; |
| int level=Z_DEFAULT_COMPRESSION, method=DEFLATED; |
| int wbits=MAX_WBITS, memLevel=DEF_MEM_LEVEL, strategy=0, err; |
| Py_buffer zdict; |
| static char *kwlist[] = {"level", "method", "wbits", |
| "memLevel", "strategy", "zdict", NULL}; |
| |
| zdict.buf = NULL; /* Sentinel, so we can tell whether zdict was supplied. */ |
| if (!PyArg_ParseTupleAndKeywords(args, kwargs, "|iiiiiy*:compressobj", |
| kwlist, &level, &method, &wbits, |
| &memLevel, &strategy, &zdict)) |
| return NULL; |
| |
| if (zdict.buf != NULL && (size_t)zdict.len > UINT_MAX) { |
| PyErr_SetString(PyExc_OverflowError, |
| "zdict length does not fit in an unsigned int"); |
| goto error; |
| } |
| |
| self = newcompobject(&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; |
| 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(self->zst, err, "while creating compression object"); |
| goto error; |
| } |
| |
| error: |
| Py_XDECREF(self); |
| self = NULL; |
| success: |
| if (zdict.buf != NULL) |
| PyBuffer_Release(&zdict); |
| return (PyObject*)self; |
| } |
| |
| static PyObject * |
| PyZlib_decompressobj(PyObject *selfptr, PyObject *args, PyObject *kwargs) |
| { |
| static char *kwlist[] = {"wbits", "zdict", NULL}; |
| int wbits=DEF_WBITS, err; |
| compobject *self; |
| PyObject *zdict=NULL; |
| |
| if (!PyArg_ParseTupleAndKeywords(args, kwargs, "|iO:decompressobj", |
| kwlist, &wbits, &zdict)) |
| return NULL; |
| if (zdict != NULL && !PyObject_CheckBuffer(zdict)) { |
| PyErr_SetString(PyExc_TypeError, |
| "zdict argument must support the buffer protocol"); |
| return NULL; |
| } |
| |
| self = newcompobject(&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) { |
| Py_INCREF(zdict); |
| self->zdict = zdict; |
| } |
| err = inflateInit2(&self->zst, wbits); |
| switch(err) { |
| case (Z_OK): |
| self->is_initialised = 1; |
| 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(self->zst, err, "while creating decompression object"); |
| Py_DECREF(self); |
| return NULL; |
| } |
| } |
| |
| static void |
| Dealloc(compobject *self) |
| { |
| #ifdef WITH_THREAD |
| PyThread_free_lock(self->lock); |
| #endif |
| Py_XDECREF(self->unused_data); |
| Py_XDECREF(self->unconsumed_tail); |
| Py_XDECREF(self->zdict); |
| PyObject_Del(self); |
| } |
| |
| static void |
| Comp_dealloc(compobject *self) |
| { |
| if (self->is_initialised) |
| deflateEnd(&self->zst); |
| Dealloc(self); |
| } |
| |
| static void |
| Decomp_dealloc(compobject *self) |
| { |
| if (self->is_initialised) |
| inflateEnd(&self->zst); |
| Dealloc(self); |
| } |
| |
| PyDoc_STRVAR(comp_compress__doc__, |
| "compress(data) -- Return a string containing data compressed.\n" |
| "\n" |
| "After calling this function, some of the input data may still\n" |
| "be stored in internal buffers for later processing.\n" |
| "Call the flush() method to clear these buffers."); |
| |
| |
| static PyObject * |
| PyZlib_objcompress(compobject *self, PyObject *args) |
| { |
| int err; |
| unsigned int inplen; |
| unsigned int length = DEFAULTALLOC, new_length; |
| PyObject *RetVal = NULL; |
| Py_buffer pinput; |
| Byte *input; |
| unsigned long start_total_out; |
| |
| if (!PyArg_ParseTuple(args, "y*:compress", &pinput)) |
| return NULL; |
| if ((size_t)pinput.len > UINT_MAX) { |
| PyErr_SetString(PyExc_OverflowError, |
| "Size does not fit in an unsigned int"); |
| goto error_outer; |
| } |
| input = pinput.buf; |
| inplen = (unsigned int)pinput.len; |
| |
| if (!(RetVal = PyBytes_FromStringAndSize(NULL, length))) |
| goto error_outer; |
| |
| ENTER_ZLIB(self); |
| |
| start_total_out = self->zst.total_out; |
| self->zst.avail_in = inplen; |
| self->zst.next_in = input; |
| self->zst.avail_out = length; |
| self->zst.next_out = (unsigned char *)PyBytes_AS_STRING(RetVal); |
| |
| Py_BEGIN_ALLOW_THREADS |
| err = deflate(&(self->zst), Z_NO_FLUSH); |
| Py_END_ALLOW_THREADS |
| |
| /* while Z_OK and the output buffer is full, there might be more output, |
| so extend the output buffer and try again */ |
| while (err == Z_OK && self->zst.avail_out == 0) { |
| if (length <= (UINT_MAX >> 1)) |
| new_length = length << 1; |
| else |
| new_length = UINT_MAX; |
| if (_PyBytes_Resize(&RetVal, new_length) < 0) { |
| Py_CLEAR(RetVal); |
| goto error; |
| } |
| self->zst.next_out = |
| (unsigned char *)PyBytes_AS_STRING(RetVal) + length; |
| self->zst.avail_out = length; |
| length = new_length; |
| |
| Py_BEGIN_ALLOW_THREADS |
| err = deflate(&(self->zst), Z_NO_FLUSH); |
| Py_END_ALLOW_THREADS |
| } |
| /* 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. |
| */ |
| |
| if (err != Z_OK && err != Z_BUF_ERROR) { |
| zlib_error(self->zst, err, "while compressing data"); |
| Py_DECREF(RetVal); |
| RetVal = NULL; |
| goto error; |
| } |
| if (_PyBytes_Resize(&RetVal, self->zst.total_out - start_total_out) < 0) { |
| Py_CLEAR(RetVal); |
| } |
| |
| error: |
| LEAVE_ZLIB(self); |
| error_outer: |
| PyBuffer_Release(&pinput); |
| return RetVal; |
| } |
| |
| /* Helper for objdecompress() and unflush(). Saves any unconsumed input data in |
| self->unused_data or self->unconsumed_tail, as appropriate. */ |
| static int |
| save_unconsumed_input(compobject *self, 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 new_size; |
| PyObject *new_data; |
| if ((size_t)self->zst.avail_in > (size_t)UINT_MAX - (size_t)old_size) { |
| PyErr_NoMemory(); |
| return -1; |
| } |
| new_size = old_size + self->zst.avail_in; |
| new_data = PyBytes_FromStringAndSize(NULL, new_size); |
| if (new_data == NULL) |
| return -1; |
| Py_MEMCPY(PyBytes_AS_STRING(new_data), |
| PyBytes_AS_STRING(self->unused_data), old_size); |
| Py_MEMCPY(PyBytes_AS_STRING(new_data) + old_size, |
| self->zst.next_in, self->zst.avail_in); |
| Py_DECREF(self->unused_data); |
| self->unused_data = new_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. */ |
| PyObject *new_data = PyBytes_FromStringAndSize( |
| (char *)self->zst.next_in, self->zst.avail_in); |
| if (new_data == NULL) |
| return -1; |
| Py_DECREF(self->unconsumed_tail); |
| self->unconsumed_tail = new_data; |
| } |
| return 0; |
| } |
| |
| /*[clinic] |
| |
| zlib.Decompress.decompress |
| |
| self: self(type="compobject *") |
| |
| data: Py_buffer |
| The binary data to decompress. |
| max_length: uint = 0 |
| The maximum allowable length of the decompressed data. |
| Unconsumed input data will be stored in |
| the unconsumed_tail attribute. |
| / |
| |
| Return a string 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]*/ |
| |
| PyDoc_STRVAR(zlib_Decompress_decompress__doc__, |
| "decompress(data, max_length=0)\n" |
| "Return a string containing the decompressed version of the data.\n" |
| "\n" |
| " data\n" |
| " The binary data to decompress.\n" |
| " max_length\n" |
| " The maximum allowable length of the decompressed data.\n" |
| " Unconsumed input data will be stored in\n" |
| " the unconsumed_tail attribute.\n" |
| "\n" |
| "After calling this function, some of the input data may still be stored in\n" |
| "internal buffers for later processing.\n" |
| "Call the flush() method to clear these buffers."); |
| |
| #define ZLIB_DECOMPRESS_DECOMPRESS_METHODDEF \ |
| {"decompress", (PyCFunction)zlib_Decompress_decompress, METH_VARARGS, zlib_Decompress_decompress__doc__}, |
| |
| static PyObject * |
| zlib_Decompress_decompress_impl(compobject *self, Py_buffer *data, unsigned int max_length); |
| |
| static PyObject * |
| zlib_Decompress_decompress(PyObject *self, PyObject *args) |
| { |
| PyObject *return_value = NULL; |
| Py_buffer data = {NULL, NULL, 0, 0, 0, 0, NULL, NULL, NULL, NULL, NULL}; |
| unsigned int max_length = 0; |
| |
| if (!PyArg_ParseTuple(args, |
| "y*|O&:decompress", |
| &data, uint_converter, &max_length)) |
| goto exit; |
| return_value = zlib_Decompress_decompress_impl((compobject *)self, &data, max_length); |
| |
| exit: |
| /* Cleanup for data */ |
| if (data.buf) |
| PyBuffer_Release(&data); |
| |
| return return_value; |
| } |
| |
| static PyObject * |
| zlib_Decompress_decompress_impl(compobject *self, Py_buffer *data, unsigned int max_length) |
| /*[clinic checksum: 5b1e4f9f1ef8eca55fff78356f9df0c81232ed3b]*/ |
| { |
| int err; |
| unsigned int old_length, length = DEFAULTALLOC; |
| PyObject *RetVal = NULL; |
| unsigned long start_total_out; |
| |
| if ((size_t)data->len > UINT_MAX) { |
| PyErr_SetString(PyExc_OverflowError, |
| "Size does not fit in an unsigned int"); |
| return NULL; |
| } |
| |
| /* limit amount of data allocated to max_length */ |
| if (max_length && length > max_length) |
| length = max_length; |
| if (!(RetVal = PyBytes_FromStringAndSize(NULL, length))) |
| return NULL; |
| |
| ENTER_ZLIB(self); |
| |
| start_total_out = self->zst.total_out; |
| self->zst.avail_in = (unsigned int)data->len; |
| self->zst.next_in = data->buf; |
| self->zst.avail_out = length; |
| self->zst.next_out = (unsigned char *)PyBytes_AS_STRING(RetVal); |
| |
| Py_BEGIN_ALLOW_THREADS |
| err = inflate(&(self->zst), Z_SYNC_FLUSH); |
| Py_END_ALLOW_THREADS |
| |
| if (err == Z_NEED_DICT && self->zdict != NULL) { |
| Py_buffer zdict_buf; |
| if (PyObject_GetBuffer(self->zdict, &zdict_buf, PyBUF_SIMPLE) == -1) { |
| Py_DECREF(RetVal); |
| RetVal = NULL; |
| goto error; |
| } |
| |
| 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); |
| Py_CLEAR(RetVal); |
| goto error; |
| } |
| |
| err = inflateSetDictionary(&(self->zst), |
| zdict_buf.buf, (unsigned int)zdict_buf.len); |
| PyBuffer_Release(&zdict_buf); |
| if (err != Z_OK) { |
| zlib_error(self->zst, err, "while decompressing data"); |
| Py_CLEAR(RetVal); |
| goto error; |
| } |
| /* Repeat the call to inflate. */ |
| Py_BEGIN_ALLOW_THREADS |
| err = inflate(&(self->zst), Z_SYNC_FLUSH); |
| Py_END_ALLOW_THREADS |
| } |
| |
| /* While Z_OK and the output buffer is full, there might be more output. |
| So extend the output buffer and try again. |
| */ |
| while (err == Z_OK && self->zst.avail_out == 0) { |
| /* If max_length set, don't continue decompressing if we've already |
| reached the limit. |
| */ |
| if (max_length && length >= max_length) |
| break; |
| |
| /* otherwise, ... */ |
| old_length = length; |
| length = length << 1; |
| if (max_length && length > max_length) |
| length = max_length; |
| |
| if (_PyBytes_Resize(&RetVal, length) < 0) { |
| Py_CLEAR(RetVal); |
| goto error; |
| } |
| self->zst.next_out = |
| (unsigned char *)PyBytes_AS_STRING(RetVal) + old_length; |
| self->zst.avail_out = length - old_length; |
| |
| Py_BEGIN_ALLOW_THREADS |
| err = inflate(&(self->zst), Z_SYNC_FLUSH); |
| Py_END_ALLOW_THREADS |
| } |
| |
| if (save_unconsumed_input(self, err) < 0) { |
| Py_DECREF(RetVal); |
| RetVal = NULL; |
| goto error; |
| } |
| |
| 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(self->zst, err, "while decompressing data"); |
| Py_DECREF(RetVal); |
| RetVal = NULL; |
| goto error; |
| } |
| |
| if (_PyBytes_Resize(&RetVal, self->zst.total_out - start_total_out) < 0) { |
| Py_CLEAR(RetVal); |
| } |
| |
| error: |
| LEAVE_ZLIB(self); |
| return RetVal; |
| } |
| |
| PyDoc_STRVAR(comp_flush__doc__, |
| "flush( [mode] ) -- Return a string containing any remaining compressed data.\n" |
| "\n" |
| "mode can be one of the constants Z_SYNC_FLUSH, Z_FULL_FLUSH, Z_FINISH; the\n" |
| "default value used when mode is not specified is Z_FINISH.\n" |
| "If mode == Z_FINISH, the compressor object can no longer be used after\n" |
| "calling the flush() method. Otherwise, more data can still be compressed."); |
| |
| static PyObject * |
| PyZlib_flush(compobject *self, PyObject *args) |
| { |
| int err; |
| unsigned int length = DEFAULTALLOC, new_length; |
| PyObject *RetVal; |
| int flushmode = Z_FINISH; |
| unsigned long start_total_out; |
| |
| if (!PyArg_ParseTuple(args, "|i:flush", &flushmode)) |
| return NULL; |
| |
| /* Flushing with Z_NO_FLUSH is a no-op, so there's no point in |
| doing any work at all; just return an empty string. */ |
| if (flushmode == Z_NO_FLUSH) { |
| return PyBytes_FromStringAndSize(NULL, 0); |
| } |
| |
| if (!(RetVal = PyBytes_FromStringAndSize(NULL, length))) |
| return NULL; |
| |
| ENTER_ZLIB(self); |
| |
| start_total_out = self->zst.total_out; |
| self->zst.avail_in = 0; |
| self->zst.avail_out = length; |
| self->zst.next_out = (unsigned char *)PyBytes_AS_STRING(RetVal); |
| |
| Py_BEGIN_ALLOW_THREADS |
| err = deflate(&(self->zst), flushmode); |
| Py_END_ALLOW_THREADS |
| |
| /* while Z_OK and the output buffer is full, there might be more output, |
| so extend the output buffer and try again */ |
| while (err == Z_OK && self->zst.avail_out == 0) { |
| if (length <= (UINT_MAX >> 1)) |
| new_length = length << 1; |
| else |
| new_length = UINT_MAX; |
| if (_PyBytes_Resize(&RetVal, new_length) < 0) { |
| Py_CLEAR(RetVal); |
| goto error; |
| } |
| self->zst.next_out = |
| (unsigned char *)PyBytes_AS_STRING(RetVal) + length; |
| self->zst.avail_out = length; |
| length = new_length; |
| |
| Py_BEGIN_ALLOW_THREADS |
| err = deflate(&(self->zst), flushmode); |
| Py_END_ALLOW_THREADS |
| } |
| |
| /* If flushmode is Z_FINISH, we also have to call deflateEnd() to free |
| various data structures. Note we should only get Z_STREAM_END when |
| flushmode is Z_FINISH, but checking both for safety*/ |
| if (err == Z_STREAM_END && flushmode == Z_FINISH) { |
| err = deflateEnd(&(self->zst)); |
| if (err != Z_OK) { |
| zlib_error(self->zst, err, "while finishing compression"); |
| Py_DECREF(RetVal); |
| RetVal = NULL; |
| goto error; |
| } |
| else |
| self->is_initialised = 0; |
| |
| /* 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. |
| */ |
| } else if (err!=Z_OK && err!=Z_BUF_ERROR) { |
| zlib_error(self->zst, err, "while flushing"); |
| Py_DECREF(RetVal); |
| RetVal = NULL; |
| goto error; |
| } |
| |
| if (_PyBytes_Resize(&RetVal, self->zst.total_out - start_total_out) < 0) { |
| Py_CLEAR(RetVal); |
| } |
| |
| error: |
| LEAVE_ZLIB(self); |
| |
| return RetVal; |
| } |
| |
| #ifdef HAVE_ZLIB_COPY |
| |
| /*[clinic] |
| zlib.Compress.copy |
| |
| self: self(type="compobject *") |
| |
| Return a copy of the compression object. |
| [clinic]*/ |
| |
| PyDoc_STRVAR(zlib_Compress_copy__doc__, |
| "copy()\n" |
| "Return a copy of the compression object."); |
| |
| #define ZLIB_COMPRESS_COPY_METHODDEF \ |
| {"copy", (PyCFunction)zlib_Compress_copy, METH_NOARGS, zlib_Compress_copy__doc__}, |
| |
| static PyObject * |
| zlib_Compress_copy_impl(compobject *self); |
| |
| static PyObject * |
| zlib_Compress_copy(PyObject *self, PyObject *Py_UNUSED(ignored)) |
| { |
| PyObject *return_value = NULL; |
| |
| return_value = zlib_Compress_copy_impl((compobject *)self); |
| |
| return return_value; |
| } |
| |
| static PyObject * |
| zlib_Compress_copy_impl(compobject *self) |
| /*[clinic checksum: 2f454ee15be3bc53cfb4e845c3f891f68be4c8e4]*/ |
| { |
| compobject *retval = NULL; |
| int err; |
| |
| retval = newcompobject(&Comptype); |
| if (!retval) return NULL; |
| |
| /* Copy the zstream state |
| * We use ENTER_ZLIB / LEAVE_ZLIB to make this thread-safe |
| */ |
| ENTER_ZLIB(self); |
| err = deflateCopy(&retval->zst, &self->zst); |
| switch(err) { |
| case(Z_OK): |
| break; |
| case(Z_STREAM_ERROR): |
| PyErr_SetString(PyExc_ValueError, "Inconsistent stream state"); |
| goto error; |
| case(Z_MEM_ERROR): |
| PyErr_SetString(PyExc_MemoryError, |
| "Can't allocate memory for compression object"); |
| goto error; |
| default: |
| zlib_error(self->zst, err, "while copying compression object"); |
| goto error; |
| } |
| Py_INCREF(self->unused_data); |
| Py_INCREF(self->unconsumed_tail); |
| Py_XINCREF(self->zdict); |
| Py_XDECREF(retval->unused_data); |
| Py_XDECREF(retval->unconsumed_tail); |
| Py_XDECREF(retval->zdict); |
| retval->unused_data = self->unused_data; |
| retval->unconsumed_tail = self->unconsumed_tail; |
| retval->zdict = self->zdict; |
| retval->eof = self->eof; |
| |
| /* Mark it as being initialized */ |
| retval->is_initialised = 1; |
| |
| LEAVE_ZLIB(self); |
| return (PyObject *)retval; |
| |
| error: |
| LEAVE_ZLIB(self); |
| Py_XDECREF(retval); |
| return NULL; |
| } |
| |
| PyDoc_STRVAR(decomp_copy__doc__, |
| "copy() -- Return a copy of the decompression object."); |
| |
| static PyObject * |
| PyZlib_uncopy(compobject *self) |
| { |
| compobject *retval = NULL; |
| int err; |
| |
| retval = newcompobject(&Decomptype); |
| if (!retval) return NULL; |
| |
| /* Copy the zstream state |
| * We use ENTER_ZLIB / LEAVE_ZLIB to make this thread-safe |
| */ |
| ENTER_ZLIB(self); |
| err = inflateCopy(&retval->zst, &self->zst); |
| switch(err) { |
| case(Z_OK): |
| break; |
| case(Z_STREAM_ERROR): |
| PyErr_SetString(PyExc_ValueError, "Inconsistent stream state"); |
| goto error; |
| case(Z_MEM_ERROR): |
| PyErr_SetString(PyExc_MemoryError, |
| "Can't allocate memory for decompression object"); |
| goto error; |
| default: |
| zlib_error(self->zst, err, "while copying decompression object"); |
| goto error; |
| } |
| |
| Py_INCREF(self->unused_data); |
| Py_INCREF(self->unconsumed_tail); |
| Py_XINCREF(self->zdict); |
| Py_XDECREF(retval->unused_data); |
| Py_XDECREF(retval->unconsumed_tail); |
| Py_XDECREF(retval->zdict); |
| retval->unused_data = self->unused_data; |
| retval->unconsumed_tail = self->unconsumed_tail; |
| retval->zdict = self->zdict; |
| retval->eof = self->eof; |
| |
| /* Mark it as being initialized */ |
| retval->is_initialised = 1; |
| |
| LEAVE_ZLIB(self); |
| return (PyObject *)retval; |
| |
| error: |
| LEAVE_ZLIB(self); |
| Py_XDECREF(retval); |
| return NULL; |
| } |
| #endif |
| |
| PyDoc_STRVAR(decomp_flush__doc__, |
| "flush( [length] ) -- Return a string containing any remaining\n" |
| "decompressed data. length, if given, is the initial size of the\n" |
| "output buffer.\n" |
| "\n" |
| "The decompressor object can no longer be used after this call."); |
| |
| static PyObject * |
| PyZlib_unflush(compobject *self, PyObject *args) |
| { |
| int err; |
| unsigned int length = DEFAULTALLOC, new_length; |
| PyObject * retval = NULL; |
| unsigned long start_total_out; |
| Py_ssize_t size; |
| |
| if (!PyArg_ParseTuple(args, "|O&:flush", uint_converter, &length)) |
| return NULL; |
| if (length == 0) { |
| PyErr_SetString(PyExc_ValueError, "length must be greater than zero"); |
| return NULL; |
| } |
| |
| if (!(retval = PyBytes_FromStringAndSize(NULL, length))) |
| return NULL; |
| |
| |
| ENTER_ZLIB(self); |
| |
| size = PyBytes_GET_SIZE(self->unconsumed_tail); |
| |
| start_total_out = self->zst.total_out; |
| /* save_unconsumed_input() ensures that unconsumed_tail length is lesser |
| or equal than UINT_MAX */ |
| self->zst.avail_in = Py_SAFE_DOWNCAST(size, Py_ssize_t, unsigned int); |
| self->zst.next_in = (Byte *)PyBytes_AS_STRING(self->unconsumed_tail); |
| self->zst.avail_out = length; |
| self->zst.next_out = (Byte *)PyBytes_AS_STRING(retval); |
| |
| Py_BEGIN_ALLOW_THREADS |
| err = inflate(&(self->zst), Z_FINISH); |
| Py_END_ALLOW_THREADS |
| |
| /* while Z_OK and the output buffer is full, there might be more output, |
| so extend the output buffer and try again */ |
| while ((err == Z_OK || err == Z_BUF_ERROR) && self->zst.avail_out == 0) { |
| if (length <= (UINT_MAX >> 1)) |
| new_length = length << 1; |
| else |
| new_length = UINT_MAX; |
| if (_PyBytes_Resize(&retval, new_length) < 0) { |
| Py_CLEAR(retval); |
| goto error; |
| } |
| self->zst.next_out = (Byte *)PyBytes_AS_STRING(retval) + length; |
| self->zst.avail_out = length; |
| length = new_length; |
| |
| Py_BEGIN_ALLOW_THREADS |
| err = inflate(&(self->zst), Z_FINISH); |
| Py_END_ALLOW_THREADS |
| } |
| |
| if (save_unconsumed_input(self, err) < 0) { |
| Py_DECREF(retval); |
| retval = NULL; |
| goto error; |
| } |
| |
| /* If at end of stream, clean up any memory allocated by zlib. */ |
| if (err == Z_STREAM_END) { |
| self->eof = 1; |
| self->is_initialised = 0; |
| err = inflateEnd(&(self->zst)); |
| if (err != Z_OK) { |
| zlib_error(self->zst, err, "while finishing decompression"); |
| Py_DECREF(retval); |
| retval = NULL; |
| goto error; |
| } |
| } |
| |
| if (_PyBytes_Resize(&retval, self->zst.total_out - start_total_out) < 0) { |
| Py_CLEAR(retval); |
| } |
| |
| error: |
| |
| LEAVE_ZLIB(self); |
| |
| return retval; |
| } |
| |
| static PyMethodDef comp_methods[] = |
| { |
| {"compress", (binaryfunc)PyZlib_objcompress, METH_VARARGS, |
| comp_compress__doc__}, |
| {"flush", (binaryfunc)PyZlib_flush, METH_VARARGS, |
| comp_flush__doc__}, |
| #ifdef HAVE_ZLIB_COPY |
| ZLIB_COMPRESS_COPY_METHODDEF |
| #endif |
| {NULL, NULL} |
| }; |
| |
| static PyMethodDef Decomp_methods[] = |
| { |
| ZLIB_DECOMPRESS_DECOMPRESS_METHODDEF |
| {"flush", (binaryfunc)PyZlib_unflush, METH_VARARGS, |
| decomp_flush__doc__}, |
| #ifdef HAVE_ZLIB_COPY |
| {"copy", (PyCFunction)PyZlib_uncopy, METH_NOARGS, |
| decomp_copy__doc__}, |
| #endif |
| {NULL, NULL} |
| }; |
| |
| #define COMP_OFF(x) offsetof(compobject, x) |
| static PyMemberDef Decomp_members[] = { |
| {"unused_data", T_OBJECT, COMP_OFF(unused_data), READONLY}, |
| {"unconsumed_tail", T_OBJECT, COMP_OFF(unconsumed_tail), READONLY}, |
| {"eof", T_BOOL, COMP_OFF(eof), READONLY}, |
| {NULL}, |
| }; |
| |
| PyDoc_STRVAR(adler32__doc__, |
| "adler32(string[, start]) -- Compute an Adler-32 checksum of string.\n" |
| "\n" |
| "An optional starting value can be specified. The returned checksum is\n" |
| "an integer."); |
| |
| static PyObject * |
| PyZlib_adler32(PyObject *self, PyObject *args) |
| { |
| unsigned int adler32val = 1; /* adler32(0L, Z_NULL, 0) */ |
| Py_buffer pbuf; |
| |
| if (!PyArg_ParseTuple(args, "y*|I:adler32", &pbuf, &adler32val)) |
| return NULL; |
| /* Releasing the GIL for very small buffers is inefficient |
| and may lower performance */ |
| if (pbuf.len > 1024*5) { |
| unsigned char *buf = pbuf.buf; |
| Py_ssize_t len = pbuf.len; |
| |
| Py_BEGIN_ALLOW_THREADS |
| /* Avoid truncation of length for very large buffers. adler32() takes |
| length as an unsigned int, which may be narrower than Py_ssize_t. */ |
| while ((size_t)len > UINT_MAX) { |
| adler32val = adler32(adler32val, buf, UINT_MAX); |
| buf += (size_t) UINT_MAX; |
| len -= (size_t) UINT_MAX; |
| } |
| adler32val = adler32(adler32val, buf, (unsigned int)len); |
| Py_END_ALLOW_THREADS |
| } else { |
| adler32val = adler32(adler32val, pbuf.buf, (unsigned int)pbuf.len); |
| } |
| PyBuffer_Release(&pbuf); |
| return PyLong_FromUnsignedLong(adler32val & 0xffffffffU); |
| } |
| |
| PyDoc_STRVAR(crc32__doc__, |
| "crc32(string[, start]) -- Compute a CRC-32 checksum of string.\n" |
| "\n" |
| "An optional starting value can be specified. The returned checksum is\n" |
| "an integer."); |
| |
| static PyObject * |
| PyZlib_crc32(PyObject *self, PyObject *args) |
| { |
| unsigned int crc32val = 0; /* crc32(0L, Z_NULL, 0) */ |
| Py_buffer pbuf; |
| int signed_val; |
| |
| if (!PyArg_ParseTuple(args, "y*|I:crc32", &pbuf, &crc32val)) |
| return NULL; |
| /* Releasing the GIL for very small buffers is inefficient |
| and may lower performance */ |
| if (pbuf.len > 1024*5) { |
| unsigned char *buf = pbuf.buf; |
| Py_ssize_t len = pbuf.len; |
| |
| Py_BEGIN_ALLOW_THREADS |
| /* Avoid truncation of length for very large buffers. crc32() takes |
| length as an unsigned int, which may be narrower than Py_ssize_t. */ |
| while ((size_t)len > UINT_MAX) { |
| crc32val = crc32(crc32val, buf, UINT_MAX); |
| buf += (size_t) UINT_MAX; |
| len -= (size_t) UINT_MAX; |
| } |
| signed_val = crc32(crc32val, buf, (unsigned int)len); |
| Py_END_ALLOW_THREADS |
| } else { |
| signed_val = crc32(crc32val, pbuf.buf, (unsigned int)pbuf.len); |
| } |
| PyBuffer_Release(&pbuf); |
| return PyLong_FromUnsignedLong(signed_val & 0xffffffffU); |
| } |
| |
| |
| static PyMethodDef zlib_methods[] = |
| { |
| {"adler32", (PyCFunction)PyZlib_adler32, METH_VARARGS, |
| adler32__doc__}, |
| ZLIB_COMPRESS_METHODDEF |
| {"compressobj", (PyCFunction)PyZlib_compressobj, METH_VARARGS|METH_KEYWORDS, |
| compressobj__doc__}, |
| {"crc32", (PyCFunction)PyZlib_crc32, METH_VARARGS, |
| crc32__doc__}, |
| {"decompress", (PyCFunction)PyZlib_decompress, METH_VARARGS, |
| decompress__doc__}, |
| {"decompressobj", (PyCFunction)PyZlib_decompressobj, METH_VARARGS|METH_KEYWORDS, |
| decompressobj__doc__}, |
| {NULL, NULL} |
| }; |
| |
| static PyTypeObject Comptype = { |
| PyVarObject_HEAD_INIT(0, 0) |
| "zlib.Compress", |
| sizeof(compobject), |
| 0, |
| (destructor)Comp_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, /*tp_flags*/ |
| 0, /*tp_doc*/ |
| 0, /*tp_traverse*/ |
| 0, /*tp_clear*/ |
| 0, /*tp_richcompare*/ |
| 0, /*tp_weaklistoffset*/ |
| 0, /*tp_iter*/ |
| 0, /*tp_iternext*/ |
| comp_methods, /*tp_methods*/ |
| }; |
| |
| static PyTypeObject Decomptype = { |
| PyVarObject_HEAD_INIT(0, 0) |
| "zlib.Decompress", |
| sizeof(compobject), |
| 0, |
| (destructor)Decomp_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, /*tp_flags*/ |
| 0, /*tp_doc*/ |
| 0, /*tp_traverse*/ |
| 0, /*tp_clear*/ |
| 0, /*tp_richcompare*/ |
| 0, /*tp_weaklistoffset*/ |
| 0, /*tp_iter*/ |
| 0, /*tp_iternext*/ |
| Decomp_methods, /*tp_methods*/ |
| Decomp_members, /*tp_members*/ |
| }; |
| |
| PyDoc_STRVAR(zlib_module_documentation, |
| "The functions in this module allow compression and decompression using the\n" |
| "zlib library, which is based on GNU zip.\n" |
| "\n" |
| "adler32(string[, start]) -- Compute an Adler-32 checksum.\n" |
| "compress(string[, level]) -- Compress string, with compression level in 0-9.\n" |
| "compressobj([level[, ...]]) -- Return a compressor object.\n" |
| "crc32(string[, start]) -- Compute a CRC-32 checksum.\n" |
| "decompress(string,[wbits],[bufsize]) -- Decompresses a compressed string.\n" |
| "decompressobj([wbits[, zdict]]]) -- Return a decompressor object.\n" |
| "\n" |
| "'wbits' is window buffer size.\n" |
| "Compressor objects support compress() and flush() methods; decompressor\n" |
| "objects support decompress() and flush()."); |
| |
| static struct PyModuleDef zlibmodule = { |
| PyModuleDef_HEAD_INIT, |
| "zlib", |
| zlib_module_documentation, |
| -1, |
| zlib_methods, |
| NULL, |
| NULL, |
| NULL, |
| NULL |
| }; |
| |
| PyMODINIT_FUNC |
| PyInit_zlib(void) |
| { |
| PyObject *m, *ver; |
| if (PyType_Ready(&Comptype) < 0) |
| return NULL; |
| if (PyType_Ready(&Decomptype) < 0) |
| return NULL; |
| m = PyModule_Create(&zlibmodule); |
| if (m == NULL) |
| return NULL; |
| |
| ZlibError = PyErr_NewException("zlib.error", NULL, NULL); |
| if (ZlibError != NULL) { |
| Py_INCREF(ZlibError); |
| PyModule_AddObject(m, "error", ZlibError); |
| } |
| PyModule_AddIntMacro(m, MAX_WBITS); |
| PyModule_AddIntMacro(m, DEFLATED); |
| PyModule_AddIntMacro(m, DEF_MEM_LEVEL); |
| PyModule_AddIntMacro(m, Z_BEST_SPEED); |
| PyModule_AddIntMacro(m, Z_BEST_COMPRESSION); |
| PyModule_AddIntMacro(m, Z_DEFAULT_COMPRESSION); |
| PyModule_AddIntMacro(m, Z_FILTERED); |
| PyModule_AddIntMacro(m, Z_HUFFMAN_ONLY); |
| PyModule_AddIntMacro(m, Z_DEFAULT_STRATEGY); |
| |
| PyModule_AddIntMacro(m, Z_FINISH); |
| PyModule_AddIntMacro(m, Z_NO_FLUSH); |
| PyModule_AddIntMacro(m, Z_SYNC_FLUSH); |
| PyModule_AddIntMacro(m, Z_FULL_FLUSH); |
| |
| ver = PyUnicode_FromString(ZLIB_VERSION); |
| if (ver != NULL) |
| PyModule_AddObject(m, "ZLIB_VERSION", ver); |
| |
| ver = PyUnicode_FromString(zlibVersion()); |
| if (ver != NULL) |
| PyModule_AddObject(m, "ZLIB_RUNTIME_VERSION", ver); |
| |
| PyModule_AddStringConstant(m, "__version__", "1.0"); |
| |
| return m; |
| } |