| /* zlibmodule.c -- gzip-compatible data compression */ |
| /* See http://www.gzip.org/zlib/ */ |
| |
| /* Windows users: read Python's PCbuild\readme.txt */ |
| |
| |
| #include "Python.h" |
| #include "zlib.h" |
| |
| #ifdef WITH_THREAD |
| #include "pythread.h" |
| |
| /* #defs ripped off from _tkinter.c, even though the situation here is much |
| simpler, because we don't have to worry about waiting for Tcl |
| events! And, since zlib itself is threadsafe, we don't need to worry |
| about re-entering zlib functions. |
| |
| N.B. |
| |
| Since ENTER_ZLIB and LEAVE_ZLIB only need to be called on functions |
| that modify the components of preexisting de/compress objects, it |
| could prove to be a performance gain on multiprocessor machines if |
| there was an de/compress object-specific lock. However, for the |
| moment the ENTER_ZLIB and LEAVE_ZLIB calls are global for ALL |
| de/compress objects. |
| */ |
| |
| static PyThread_type_lock zlib_lock = NULL; /* initialized on module load */ |
| |
| #define ENTER_ZLIB \ |
| Py_BEGIN_ALLOW_THREADS \ |
| PyThread_acquire_lock(zlib_lock, 1); \ |
| Py_END_ALLOW_THREADS |
| |
| #define LEAVE_ZLIB \ |
| PyThread_release_lock(zlib_lock); |
| |
| #else |
| |
| #define ENTER_ZLIB |
| #define LEAVE_ZLIB |
| |
| #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) |
| #define PyInit_zlib initzlib |
| |
| static PyTypeObject Comptype; |
| static PyTypeObject Decomptype; |
| |
| static PyObject *ZlibError; |
| |
| typedef struct |
| { |
| PyObject_HEAD |
| z_stream zst; |
| PyObject *unused_data; |
| PyObject *unconsumed_tail; |
| int is_initialised; |
| } compobject; |
| |
| static void |
| zlib_error(z_stream zst, int err, char *msg) |
| { |
| if (zst.msg == Z_NULL) |
| PyErr_Format(ZlibError, "Error %d %s", err, msg); |
| else |
| PyErr_Format(ZlibError, "Error %d %s: %.200s", err, msg, zst.msg); |
| } |
| |
| PyDoc_STRVAR(compressobj__doc__, |
| "compressobj([level]) -- Return a compressor object.\n" |
| "\n" |
| "Optional arg level is the compression level, in 1-9."); |
| |
| PyDoc_STRVAR(decompressobj__doc__, |
| "decompressobj([wbits]) -- Return a decompressor object.\n" |
| "\n" |
| "Optional arg wbits is the window buffer size."); |
| |
| static compobject * |
| newcompobject(PyTypeObject *type) |
| { |
| compobject *self; |
| self = PyObject_New(compobject, type); |
| if (self == NULL) |
| return NULL; |
| self->is_initialised = 0; |
| 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; |
| } |
| return self; |
| } |
| |
| PyDoc_STRVAR(compress__doc__, |
| "compress(string[, level]) -- Returned compressed string.\n" |
| "\n" |
| "Optional arg level is the compression level, in 1-9."); |
| |
| static PyObject * |
| PyZlib_compress(PyObject *self, PyObject *args) |
| { |
| PyObject *ReturnVal = NULL; |
| Byte *input, *output; |
| int length, level=Z_DEFAULT_COMPRESSION, err; |
| z_stream zst; |
| |
| /* require Python string object, optional 'level' arg */ |
| if (!PyArg_ParseTuple(args, "s#|i:compress", &input, &length, &level)) |
| return NULL; |
| |
| zst.avail_out = length + length/1000 + 12 + 1; |
| |
| output = (Byte*)malloc(zst.avail_out); |
| if (output == NULL) { |
| PyErr_SetString(PyExc_MemoryError, |
| "Can't allocate memory to compress data"); |
| return NULL; |
| } |
| |
| /* Past the point of no return. From here on out, we need to make sure |
| we clean up mallocs & INCREFs. */ |
| |
| zst.zalloc = (alloc_func)NULL; |
| zst.zfree = (free_func)Z_NULL; |
| 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: |
| free(output); |
| |
| return ReturnVal; |
| } |
| |
| 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; |
| Byte *input; |
| int length, err; |
| int wsize=DEF_WBITS, r_strlen=DEFAULTALLOC; |
| z_stream zst; |
| |
| if (!PyArg_ParseTuple(args, "s#|ii:decompress", |
| &input, &length, &wsize, &r_strlen)) |
| return NULL; |
| |
| if (r_strlen <= 0) |
| r_strlen = 1; |
| |
| zst.avail_in = length; |
| zst.avail_out = r_strlen; |
| |
| if (!(result_str = PyBytes_FromStringAndSize(NULL, r_strlen))) |
| return NULL; |
| |
| zst.zalloc = (alloc_func)NULL; |
| zst.zfree = (free_func)Z_NULL; |
| 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) { |
| PyErr_Format(ZlibError, "Error %i while decompressing data", |
| err); |
| inflateEnd(&zst); |
| goto error; |
| } |
| /* fall through */ |
| case(Z_OK): |
| /* need more memory */ |
| if (PyBytes_Resize(result_str, r_strlen << 1) < 0) { |
| inflateEnd(&zst); |
| goto error; |
| } |
| zst.next_out = |
| (unsigned char *)PyBytes_AS_STRING(result_str) + r_strlen; |
| zst.avail_out = r_strlen; |
| r_strlen = r_strlen << 1; |
| 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 data decompression"); |
| goto error; |
| } |
| |
| if (PyBytes_Resize(result_str, zst.total_out) < 0) |
| goto error; |
| |
| return result_str; |
| |
| error: |
| Py_XDECREF(result_str); |
| return NULL; |
| } |
| |
| static PyObject * |
| PyZlib_compressobj(PyObject *selfptr, PyObject *args) |
| { |
| compobject *self; |
| int level=Z_DEFAULT_COMPRESSION, method=DEFLATED; |
| int wbits=MAX_WBITS, memLevel=DEF_MEM_LEVEL, strategy=0, err; |
| |
| if (!PyArg_ParseTuple(args, "|iiiii:compressobj", &level, &method, &wbits, |
| &memLevel, &strategy)) |
| return NULL; |
| |
| self = newcompobject(&Comptype); |
| if (self==NULL) |
| return(NULL); |
| self->zst.zalloc = (alloc_func)NULL; |
| self->zst.zfree = (free_func)Z_NULL; |
| 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; |
| return (PyObject*)self; |
| case (Z_MEM_ERROR): |
| Py_DECREF(self); |
| PyErr_SetString(PyExc_MemoryError, |
| "Can't allocate memory for compression object"); |
| return NULL; |
| case(Z_STREAM_ERROR): |
| Py_DECREF(self); |
| PyErr_SetString(PyExc_ValueError, "Invalid initialization option"); |
| return NULL; |
| default: |
| zlib_error(self->zst, err, "while creating compression object"); |
| Py_DECREF(self); |
| return NULL; |
| } |
| } |
| |
| static PyObject * |
| PyZlib_decompressobj(PyObject *selfptr, PyObject *args) |
| { |
| int wbits=DEF_WBITS, err; |
| compobject *self; |
| if (!PyArg_ParseTuple(args, "|i:decompressobj", &wbits)) |
| return NULL; |
| |
| self = newcompobject(&Decomptype); |
| if (self == NULL) |
| return(NULL); |
| self->zst.zalloc = (alloc_func)NULL; |
| self->zst.zfree = (free_func)Z_NULL; |
| self->zst.next_in = NULL; |
| self->zst.avail_in = 0; |
| 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 |
| Comp_dealloc(compobject *self) |
| { |
| if (self->is_initialised) |
| deflateEnd(&self->zst); |
| Py_XDECREF(self->unused_data); |
| Py_XDECREF(self->unconsumed_tail); |
| PyObject_Del(self); |
| } |
| |
| static void |
| Decomp_dealloc(compobject *self) |
| { |
| if (self->is_initialised) |
| inflateEnd(&self->zst); |
| Py_XDECREF(self->unused_data); |
| Py_XDECREF(self->unconsumed_tail); |
| PyObject_Del(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, inplen, length = DEFAULTALLOC; |
| PyObject *RetVal; |
| Byte *input; |
| unsigned long start_total_out; |
| |
| if (!PyArg_ParseTuple(args, "s#:compress", &input, &inplen)) |
| return NULL; |
| |
| if (!(RetVal = PyBytes_FromStringAndSize(NULL, length))) |
| return NULL; |
| |
| ENTER_ZLIB |
| |
| 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 (PyBytes_Resize(RetVal, length << 1) < 0) { |
| Py_DECREF(RetVal); |
| RetVal = NULL; |
| goto error; |
| } |
| self->zst.next_out = |
| (unsigned char *)PyBytes_AS_STRING(RetVal) + length; |
| self->zst.avail_out = length; |
| length = length << 1; |
| |
| 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"); |
| Py_DECREF(RetVal); |
| RetVal = NULL; |
| goto error; |
| } |
| if (PyBytes_Resize(RetVal, self->zst.total_out - start_total_out) < 0) { |
| Py_DECREF(RetVal); |
| RetVal = NULL; |
| } |
| |
| error: |
| LEAVE_ZLIB |
| return RetVal; |
| } |
| |
| PyDoc_STRVAR(decomp_decompress__doc__, |
| "decompress(data, max_length) -- Return a string containing the decompressed\n" |
| "version of the data.\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.\n" |
| "If the max_length parameter is specified then the return value will be\n" |
| "no longer than max_length. Unconsumed input data will be stored in\n" |
| "the unconsumed_tail attribute."); |
| |
| static PyObject * |
| PyZlib_objdecompress(compobject *self, PyObject *args) |
| { |
| int err, inplen, old_length, length = DEFAULTALLOC; |
| int max_length = 0; |
| PyObject *RetVal; |
| Byte *input; |
| unsigned long start_total_out; |
| |
| if (!PyArg_ParseTuple(args, "s#|i:decompress", &input, |
| &inplen, &max_length)) |
| return NULL; |
| if (max_length < 0) { |
| PyErr_SetString(PyExc_ValueError, |
| "max_length must be greater than zero"); |
| 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 |
| |
| 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 = 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_DECREF(RetVal); |
| RetVal = NULL; |
| 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 |
| } |
| |
| /* Not all of the compressed data could be accommodated in the output buffer |
| of specified size. Return the unconsumed tail in an attribute.*/ |
| if(max_length) { |
| Py_DECREF(self->unconsumed_tail); |
| self->unconsumed_tail = PyBytes_FromStringAndSize((char *)self->zst.next_in, |
| self->zst.avail_in); |
| if(!self->unconsumed_tail) { |
| Py_DECREF(RetVal); |
| RetVal = NULL; |
| goto error; |
| } |
| } |
| |
| /* The end of the compressed data has been reached, so set the |
| unused_data attribute to a string containing the remainder of the |
| data in the string. Note that this is also a logical place to call |
| inflateEnd, but the old behaviour of only calling it on flush() is |
| preserved. |
| */ |
| if (err == Z_STREAM_END) { |
| Py_XDECREF(self->unused_data); /* Free original empty string */ |
| self->unused_data = PyBytes_FromStringAndSize( |
| (char *)self->zst.next_in, self->zst.avail_in); |
| if (self->unused_data == NULL) { |
| Py_DECREF(RetVal); |
| goto 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. |
| */ |
| } else if (err != Z_OK && err != Z_BUF_ERROR) { |
| zlib_error(self->zst, err, "while decompressing"); |
| Py_DECREF(RetVal); |
| RetVal = NULL; |
| goto error; |
| } |
| |
| if (PyBytes_Resize(RetVal, self->zst.total_out - start_total_out) < 0) { |
| Py_DECREF(RetVal); |
| RetVal = NULL; |
| } |
| |
| error: |
| LEAVE_ZLIB |
| |
| 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, length = DEFAULTALLOC; |
| 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 |
| |
| 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 (PyBytes_Resize(RetVal, length << 1) < 0) { |
| Py_DECREF(RetVal); |
| RetVal = NULL; |
| goto error; |
| } |
| self->zst.next_out = |
| (unsigned char *)PyBytes_AS_STRING(RetVal) + length; |
| self->zst.avail_out = length; |
| length = length << 1; |
| |
| 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, "from deflateEnd()"); |
| 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_DECREF(RetVal); |
| RetVal = NULL; |
| } |
| |
| error: |
| LEAVE_ZLIB |
| |
| return RetVal; |
| } |
| |
| #ifdef HAVE_ZLIB_COPY |
| PyDoc_STRVAR(comp_copy__doc__, |
| "copy() -- Return a copy of the compression object."); |
| |
| static PyObject * |
| PyZlib_copy(compobject *self) |
| { |
| 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 |
| 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_XDECREF(retval->unused_data); |
| Py_XDECREF(retval->unconsumed_tail); |
| retval->unused_data = self->unused_data; |
| retval->unconsumed_tail = self->unconsumed_tail; |
| |
| /* Mark it as being initialized */ |
| retval->is_initialised = 1; |
| |
| LEAVE_ZLIB |
| return (PyObject *)retval; |
| |
| error: |
| LEAVE_ZLIB |
| 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 |
| 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_XDECREF(retval->unused_data); |
| Py_XDECREF(retval->unconsumed_tail); |
| retval->unused_data = self->unused_data; |
| retval->unconsumed_tail = self->unconsumed_tail; |
| |
| /* Mark it as being initialized */ |
| retval->is_initialised = 1; |
| |
| LEAVE_ZLIB |
| return (PyObject *)retval; |
| |
| error: |
| LEAVE_ZLIB |
| 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, length = DEFAULTALLOC; |
| PyObject * retval = NULL; |
| unsigned long start_total_out; |
| |
| if (!PyArg_ParseTuple(args, "|i:flush", &length)) |
| return NULL; |
| if (!(retval = PyBytes_FromStringAndSize(NULL, length))) |
| return NULL; |
| |
| |
| ENTER_ZLIB |
| |
| start_total_out = self->zst.total_out; |
| 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 (PyBytes_Resize(retval, length << 1) < 0) { |
| Py_DECREF(retval); |
| retval = NULL; |
| goto error; |
| } |
| self->zst.next_out = (Byte *)PyBytes_AS_STRING(retval) + length; |
| self->zst.avail_out = length; |
| length = length << 1; |
| |
| Py_BEGIN_ALLOW_THREADS |
| err = inflate(&(self->zst), Z_FINISH); |
| 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 */ |
| if (err == Z_STREAM_END) { |
| err = inflateEnd(&(self->zst)); |
| self->is_initialised = 0; |
| if (err != Z_OK) { |
| zlib_error(self->zst, err, "from inflateEnd()"); |
| Py_DECREF(retval); |
| retval = NULL; |
| goto error; |
| } |
| } |
| if (PyBytes_Resize(retval, self->zst.total_out - start_total_out) < 0) { |
| Py_DECREF(retval); |
| retval = NULL; |
| } |
| |
| error: |
| |
| LEAVE_ZLIB |
| |
| 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 |
| {"copy", (PyCFunction)PyZlib_copy, METH_NOARGS, |
| comp_copy__doc__}, |
| #endif |
| {NULL, NULL} |
| }; |
| |
| static PyMethodDef Decomp_methods[] = |
| { |
| {"decompress", (binaryfunc)PyZlib_objdecompress, METH_VARARGS, |
| decomp_decompress__doc__}, |
| {"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} |
| }; |
| |
| static PyObject * |
| Comp_getattr(compobject *self, char *name) |
| { |
| /* No ENTER/LEAVE_ZLIB is necessary because this fn doesn't touch |
| internal data. */ |
| |
| return Py_FindMethod(comp_methods, (PyObject *)self, name); |
| } |
| |
| static PyObject * |
| Decomp_getattr(compobject *self, char *name) |
| { |
| PyObject * retval; |
| |
| ENTER_ZLIB |
| |
| if (strcmp(name, "unused_data") == 0) { |
| Py_INCREF(self->unused_data); |
| retval = self->unused_data; |
| } else if (strcmp(name, "unconsumed_tail") == 0) { |
| Py_INCREF(self->unconsumed_tail); |
| retval = self->unconsumed_tail; |
| } else |
| retval = Py_FindMethod(Decomp_methods, (PyObject *)self, name); |
| |
| LEAVE_ZLIB |
| |
| return retval; |
| } |
| |
| 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) |
| { |
| uLong adler32val = adler32(0L, Z_NULL, 0); |
| Byte *buf; |
| int len; |
| |
| if (!PyArg_ParseTuple(args, "s#|k:adler32", &buf, &len, &adler32val)) |
| return NULL; |
| adler32val = adler32(adler32val, buf, len); |
| return PyInt_FromLong(adler32val); |
| } |
| |
| 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) |
| { |
| uLong crc32val = crc32(0L, Z_NULL, 0); |
| Byte *buf; |
| int len; |
| if (!PyArg_ParseTuple(args, "s#|k:crc32", &buf, &len, &crc32val)) |
| return NULL; |
| crc32val = crc32(crc32val, buf, len); |
| return PyInt_FromLong(crc32val); |
| } |
| |
| |
| static PyMethodDef zlib_methods[] = |
| { |
| {"adler32", (PyCFunction)PyZlib_adler32, METH_VARARGS, |
| adler32__doc__}, |
| {"compress", (PyCFunction)PyZlib_compress, METH_VARARGS, |
| compress__doc__}, |
| {"compressobj", (PyCFunction)PyZlib_compressobj, METH_VARARGS, |
| compressobj__doc__}, |
| {"crc32", (PyCFunction)PyZlib_crc32, METH_VARARGS, |
| crc32__doc__}, |
| {"decompress", (PyCFunction)PyZlib_decompress, METH_VARARGS, |
| decompress__doc__}, |
| {"decompressobj", (PyCFunction)PyZlib_decompressobj, METH_VARARGS, |
| decompressobj__doc__}, |
| {NULL, NULL} |
| }; |
| |
| static PyTypeObject Comptype = { |
| PyObject_HEAD_INIT(0) |
| 0, |
| "zlib.Compress", |
| sizeof(compobject), |
| 0, |
| (destructor)Comp_dealloc, /*tp_dealloc*/ |
| 0, /*tp_print*/ |
| (getattrfunc)Comp_getattr, /*tp_getattr*/ |
| 0, /*tp_setattr*/ |
| 0, /*tp_compare*/ |
| 0, /*tp_repr*/ |
| 0, /*tp_as_number*/ |
| 0, /*tp_as_sequence*/ |
| 0, /*tp_as_mapping*/ |
| }; |
| |
| static PyTypeObject Decomptype = { |
| PyObject_HEAD_INIT(0) |
| 0, |
| "zlib.Decompress", |
| sizeof(compobject), |
| 0, |
| (destructor)Decomp_dealloc, /*tp_dealloc*/ |
| 0, /*tp_print*/ |
| (getattrfunc)Decomp_getattr, /*tp_getattr*/ |
| 0, /*tp_setattr*/ |
| 0, /*tp_compare*/ |
| 0, /*tp_repr*/ |
| 0, /*tp_as_number*/ |
| 0, /*tp_as_sequence*/ |
| 0, /*tp_as_mapping*/ |
| }; |
| |
| 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 1-9.\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]) -- 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()."); |
| |
| PyMODINIT_FUNC |
| PyInit_zlib(void) |
| { |
| PyObject *m, *ver; |
| Comptype.ob_type = &PyType_Type; |
| Decomptype.ob_type = &PyType_Type; |
| m = Py_InitModule4("zlib", zlib_methods, |
| zlib_module_documentation, |
| (PyObject*)NULL,PYTHON_API_VERSION); |
| if (m == NULL) |
| return; |
| |
| ZlibError = PyErr_NewException("zlib.error", NULL, NULL); |
| if (ZlibError != NULL) { |
| Py_INCREF(ZlibError); |
| PyModule_AddObject(m, "error", ZlibError); |
| } |
| PyModule_AddIntConstant(m, "MAX_WBITS", MAX_WBITS); |
| PyModule_AddIntConstant(m, "DEFLATED", DEFLATED); |
| PyModule_AddIntConstant(m, "DEF_MEM_LEVEL", DEF_MEM_LEVEL); |
| PyModule_AddIntConstant(m, "Z_BEST_SPEED", Z_BEST_SPEED); |
| PyModule_AddIntConstant(m, "Z_BEST_COMPRESSION", Z_BEST_COMPRESSION); |
| PyModule_AddIntConstant(m, "Z_DEFAULT_COMPRESSION", Z_DEFAULT_COMPRESSION); |
| PyModule_AddIntConstant(m, "Z_FILTERED", Z_FILTERED); |
| PyModule_AddIntConstant(m, "Z_HUFFMAN_ONLY", Z_HUFFMAN_ONLY); |
| PyModule_AddIntConstant(m, "Z_DEFAULT_STRATEGY", Z_DEFAULT_STRATEGY); |
| |
| PyModule_AddIntConstant(m, "Z_FINISH", Z_FINISH); |
| PyModule_AddIntConstant(m, "Z_NO_FLUSH", Z_NO_FLUSH); |
| PyModule_AddIntConstant(m, "Z_SYNC_FLUSH", Z_SYNC_FLUSH); |
| PyModule_AddIntConstant(m, "Z_FULL_FLUSH", Z_FULL_FLUSH); |
| |
| ver = PyString_FromString(ZLIB_VERSION); |
| if (ver != NULL) |
| PyModule_AddObject(m, "ZLIB_VERSION", ver); |
| |
| PyModule_AddStringConstant(m, "__version__", "1.0"); |
| |
| #ifdef WITH_THREAD |
| zlib_lock = PyThread_allocate_lock(); |
| #endif /* WITH_THREAD */ |
| } |