[mirror_edk2.git] / AppPkg / Applications / Python / Python-2.7.10 / Modules / zlibmodule.c

/* zlibmodule.c -- gzip-compatible data compression */\r
/* See http://www.gzip.org/zlib/ */\r
\r
/* Windows users:  read Python's PCbuild\readme.txt */\r
\r
\r
#include "Python.h"\r
#include "zlib.h"\r
\r
#ifdef WITH_THREAD\r
#include "pythread.h"\r
\r
/* #defs ripped off from _tkinter.c, even though the situation here is much\r
   simpler, because we don't have to worry about waiting for Tcl\r
   events!  And, since zlib itself is threadsafe, we don't need to worry\r
   about re-entering zlib functions.\r
\r
   N.B.\r
\r
   Since ENTER_ZLIB and LEAVE_ZLIB only need to be called on functions\r
   that modify the components of preexisting de/compress objects, it\r
   could prove to be a performance gain on multiprocessor machines if\r
   there was an de/compress object-specific lock.  However, for the\r
   moment the ENTER_ZLIB and LEAVE_ZLIB calls are global for ALL\r
   de/compress objects.\r
 */\r
\r
static PyThread_type_lock zlib_lock = NULL; /* initialized on module load */\r
\r
#define ENTER_ZLIB \\r
        Py_BEGIN_ALLOW_THREADS \\r
        PyThread_acquire_lock(zlib_lock, 1); \\r
        Py_END_ALLOW_THREADS\r
\r
#define LEAVE_ZLIB \\r
        PyThread_release_lock(zlib_lock);\r
\r
#else\r
\r
#define ENTER_ZLIB\r
#define LEAVE_ZLIB\r
\r
#endif\r
\r
/* The following parameters are copied from zutil.h, version 0.95 */\r
#define DEFLATED   8\r
#if MAX_MEM_LEVEL >= 8\r
#  define DEF_MEM_LEVEL 8\r
#else\r
#  define DEF_MEM_LEVEL  MAX_MEM_LEVEL\r
#endif\r
#define DEF_WBITS MAX_WBITS\r
\r
/* The output buffer will be increased in chunks of DEFAULTALLOC bytes. */\r
#define DEFAULTALLOC (16*1024)\r
#define PyInit_zlib initzlib\r
\r
static PyTypeObject Comptype;\r
static PyTypeObject Decomptype;\r
\r
static PyObject *ZlibError;\r
\r
typedef struct\r
{\r
    PyObject_HEAD\r
    z_stream zst;\r
    PyObject *unused_data;\r
    PyObject *unconsumed_tail;\r
    int is_initialised;\r
} compobject;\r
\r
static void\r
zlib_error(z_stream zst, int err, char *msg)\r
{\r
    const char *zmsg = Z_NULL;\r
    /* In case of a version mismatch, zst.msg won't be initialized.\r
       Check for this case first, before looking at zst.msg. */\r
    if (err == Z_VERSION_ERROR)\r
        zmsg = "library version mismatch";\r
    if (zmsg == Z_NULL)\r
        zmsg = zst.msg;\r
    if (zmsg == Z_NULL) {\r
        switch (err) {\r
        case Z_BUF_ERROR:\r
            zmsg = "incomplete or truncated stream";\r
            break;\r
        case Z_STREAM_ERROR:\r
            zmsg = "inconsistent stream state";\r
            break;\r
        case Z_DATA_ERROR:\r
            zmsg = "invalid input data";\r
            break;\r
        }\r
    }\r
    if (zmsg == Z_NULL)\r
        PyErr_Format(ZlibError, "Error %d %s", err, msg);\r
    else\r
        PyErr_Format(ZlibError, "Error %d %s: %.200s", err, msg, zmsg);\r
}\r
\r
PyDoc_STRVAR(compressobj__doc__,\r
"compressobj([level]) -- Return a compressor object.\n"\r
"\n"\r
"Optional arg level is the compression level, in 0-9.");\r
\r
PyDoc_STRVAR(decompressobj__doc__,\r
"decompressobj([wbits]) -- Return a decompressor object.\n"\r
"\n"\r
"Optional arg wbits is the window buffer size.");\r
\r
static compobject *\r
newcompobject(PyTypeObject *type)\r
{\r
    compobject *self;\r
    self = PyObject_New(compobject, type);\r
    if (self == NULL)\r
        return NULL;\r
    self->is_initialised = 0;\r
    self->unused_data = PyString_FromString("");\r
    if (self->unused_data == NULL) {\r
        Py_DECREF(self);\r
        return NULL;\r
    }\r
    self->unconsumed_tail = PyString_FromString("");\r
    if (self->unconsumed_tail == NULL) {\r
        Py_DECREF(self);\r
        return NULL;\r
    }\r
    return self;\r
}\r
\r
PyDoc_STRVAR(compress__doc__,\r
"compress(string[, level]) -- Returned compressed string.\n"\r
"\n"\r
"Optional arg level is the compression level, in 0-9.");\r
\r
static PyObject *\r
PyZlib_compress(PyObject *self, PyObject *args)\r
{\r
    PyObject *ReturnVal = NULL;\r
    Byte *input, *output;\r
    int length, level=Z_DEFAULT_COMPRESSION, err;\r
    z_stream zst;\r
\r
    /* require Python string object, optional 'level' arg */\r
    if (!PyArg_ParseTuple(args, "s#|i:compress", &input, &length, &level))\r
        return NULL;\r
\r
    zst.avail_out = length + length/1000 + 12 + 1;\r
\r
    output = (Byte*)malloc(zst.avail_out);\r
    if (output == NULL) {\r
        PyErr_SetString(PyExc_MemoryError,\r
                        "Can't allocate memory to compress data");\r
        return NULL;\r
    }\r
\r
    /* Past the point of no return.  From here on out, we need to make sure\r
       we clean up mallocs & INCREFs. */\r
\r
    zst.zalloc = (alloc_func)NULL;\r
    zst.zfree = (free_func)Z_NULL;\r
    zst.next_out = (Byte *)output;\r
    zst.next_in = (Byte *)input;\r
    zst.avail_in = length;\r
    err = deflateInit(&zst, level);\r
\r
    switch(err) {\r
    case(Z_OK):\r
        break;\r
    case(Z_MEM_ERROR):\r
        PyErr_SetString(PyExc_MemoryError,\r
                        "Out of memory while compressing data");\r
        goto error;\r
    case(Z_STREAM_ERROR):\r
        PyErr_SetString(ZlibError,\r
                        "Bad compression level");\r
        goto error;\r
    default:\r
        deflateEnd(&zst);\r
        zlib_error(zst, err, "while compressing data");\r
        goto error;\r
    }\r
\r
    Py_BEGIN_ALLOW_THREADS;\r
    err = deflate(&zst, Z_FINISH);\r
    Py_END_ALLOW_THREADS;\r
\r
    if (err != Z_STREAM_END) {\r
        zlib_error(zst, err, "while compressing data");\r
        deflateEnd(&zst);\r
        goto error;\r
    }\r
\r
    err=deflateEnd(&zst);\r
    if (err == Z_OK)\r
        ReturnVal = PyString_FromStringAndSize((char *)output,\r
                                               zst.total_out);\r
    else\r
        zlib_error(zst, err, "while finishing compression");\r
\r
 error:\r
    free(output);\r
\r
    return ReturnVal;\r
}\r
\r
PyDoc_STRVAR(decompress__doc__,\r
"decompress(string[, wbits[, bufsize]]) -- Return decompressed string.\n"\r
"\n"\r
"Optional arg wbits is the window buffer size.  Optional arg bufsize is\n"\r
"the initial output buffer size.");\r
\r
static PyObject *\r
PyZlib_decompress(PyObject *self, PyObject *args)\r
{\r
    PyObject *result_str;\r
    Byte *input;\r
    int length, err;\r
    int wsize=DEF_WBITS;\r
    Py_ssize_t r_strlen=DEFAULTALLOC;\r
    z_stream zst;\r
\r
    if (!PyArg_ParseTuple(args, "s#|in:decompress",\r
                          &input, &length, &wsize, &r_strlen))\r
        return NULL;\r
\r
    if (r_strlen <= 0)\r
        r_strlen = 1;\r
\r
    zst.avail_in = length;\r
    zst.avail_out = r_strlen;\r
\r
    if (!(result_str = PyString_FromStringAndSize(NULL, r_strlen)))\r
        return NULL;\r
\r
    zst.zalloc = (alloc_func)NULL;\r
    zst.zfree = (free_func)Z_NULL;\r
    zst.next_out = (Byte *)PyString_AS_STRING(result_str);\r
    zst.next_in = (Byte *)input;\r
    err = inflateInit2(&zst, wsize);\r
\r
    switch(err) {\r
    case(Z_OK):\r
        break;\r
    case(Z_MEM_ERROR):\r
        PyErr_SetString(PyExc_MemoryError,\r
                        "Out of memory while decompressing data");\r
        goto error;\r
    default:\r
        inflateEnd(&zst);\r
        zlib_error(zst, err, "while preparing to decompress data");\r
        goto error;\r
    }\r
\r
    do {\r
        Py_BEGIN_ALLOW_THREADS\r
        err=inflate(&zst, Z_FINISH);\r
        Py_END_ALLOW_THREADS\r
\r
        switch(err) {\r
        case(Z_STREAM_END):\r
            break;\r
        case(Z_BUF_ERROR):\r
            /*\r
             * If there is at least 1 byte of room according to zst.avail_out\r
             * and we get this error, assume that it means zlib cannot\r
             * process the inflate call() due to an error in the data.\r
             */\r
            if (zst.avail_out > 0) {\r
                zlib_error(zst, err, "while decompressing data");\r
                inflateEnd(&zst);\r
                goto error;\r
            }\r
            /* fall through */\r
        case(Z_OK):\r
            /* need more memory */\r
            if (_PyString_Resize(&result_str, r_strlen << 1) < 0) {\r
                inflateEnd(&zst);\r
                goto error;\r
            }\r
            zst.next_out = (unsigned char *)PyString_AS_STRING(result_str) \\r
                + r_strlen;\r
            zst.avail_out = r_strlen;\r
            r_strlen = r_strlen << 1;\r
            break;\r
        default:\r
            inflateEnd(&zst);\r
            zlib_error(zst, err, "while decompressing data");\r
            goto error;\r
        }\r
    } while (err != Z_STREAM_END);\r
\r
    err = inflateEnd(&zst);\r
    if (err != Z_OK) {\r
        zlib_error(zst, err, "while finishing data decompression");\r
        goto error;\r
    }\r
\r
    _PyString_Resize(&result_str, zst.total_out);\r
    return result_str;\r
\r
 error:\r
    Py_XDECREF(result_str);\r
    return NULL;\r
}\r
\r
static PyObject *\r
PyZlib_compressobj(PyObject *selfptr, PyObject *args)\r
{\r
    compobject *self;\r
    int level=Z_DEFAULT_COMPRESSION, method=DEFLATED;\r
    int wbits=MAX_WBITS, memLevel=DEF_MEM_LEVEL, strategy=0, err;\r
\r
    if (!PyArg_ParseTuple(args, "|iiiii:compressobj", &level, &method, &wbits,\r
                          &memLevel, &strategy))\r
        return NULL;\r
\r
    self = newcompobject(&Comptype);\r
    if (self==NULL)\r
        return(NULL);\r
    self->zst.zalloc = (alloc_func)NULL;\r
    self->zst.zfree = (free_func)Z_NULL;\r
    self->zst.next_in = NULL;\r
    self->zst.avail_in = 0;\r
    err = deflateInit2(&self->zst, level, method, wbits, memLevel, strategy);\r
    switch(err) {\r
    case (Z_OK):\r
        self->is_initialised = 1;\r
        return (PyObject*)self;\r
    case (Z_MEM_ERROR):\r
        Py_DECREF(self);\r
        PyErr_SetString(PyExc_MemoryError,\r
                        "Can't allocate memory for compression object");\r
        return NULL;\r
    case(Z_STREAM_ERROR):\r
        Py_DECREF(self);\r
        PyErr_SetString(PyExc_ValueError, "Invalid initialization option");\r
        return NULL;\r
    default:\r
        zlib_error(self->zst, err, "while creating compression object");\r
        Py_DECREF(self);\r
        return NULL;\r
    }\r
}\r
\r
static PyObject *\r
PyZlib_decompressobj(PyObject *selfptr, PyObject *args)\r
{\r
    int wbits=DEF_WBITS, err;\r
    compobject *self;\r
    if (!PyArg_ParseTuple(args, "|i:decompressobj", &wbits))\r
        return NULL;\r
\r
    self = newcompobject(&Decomptype);\r
    if (self == NULL)\r
        return(NULL);\r
    self->zst.zalloc = (alloc_func)NULL;\r
    self->zst.zfree = (free_func)Z_NULL;\r
    self->zst.next_in = NULL;\r
    self->zst.avail_in = 0;\r
    err = inflateInit2(&self->zst, wbits);\r
    switch(err) {\r
    case (Z_OK):\r
        self->is_initialised = 1;\r
        return (PyObject*)self;\r
    case(Z_STREAM_ERROR):\r
        Py_DECREF(self);\r
        PyErr_SetString(PyExc_ValueError, "Invalid initialization option");\r
        return NULL;\r
    case (Z_MEM_ERROR):\r
        Py_DECREF(self);\r
        PyErr_SetString(PyExc_MemoryError,\r
                        "Can't allocate memory for decompression object");\r
        return NULL;\r
    default:\r
        zlib_error(self->zst, err, "while creating decompression object");\r
        Py_DECREF(self);\r
        return NULL;\r
    }\r
}\r
\r
static void\r
Comp_dealloc(compobject *self)\r
{\r
    if (self->is_initialised)\r
        deflateEnd(&self->zst);\r
    Py_XDECREF(self->unused_data);\r
    Py_XDECREF(self->unconsumed_tail);\r
    PyObject_Del(self);\r
}\r
\r
static void\r
Decomp_dealloc(compobject *self)\r
{\r
    if (self->is_initialised)\r
        inflateEnd(&self->zst);\r
    Py_XDECREF(self->unused_data);\r
    Py_XDECREF(self->unconsumed_tail);\r
    PyObject_Del(self);\r
}\r
\r
PyDoc_STRVAR(comp_compress__doc__,\r
"compress(data) -- Return a string containing data compressed.\n"\r
"\n"\r
"After calling this function, some of the input data may still\n"\r
"be stored in internal buffers for later processing.\n"\r
"Call the flush() method to clear these buffers.");\r
\r
\r
static PyObject *\r
PyZlib_objcompress(compobject *self, PyObject *args)\r
{\r
    int err, inplen;\r
    Py_ssize_t length = DEFAULTALLOC;\r
    PyObject *RetVal;\r
    Byte *input;\r
    unsigned long start_total_out;\r
\r
    if (!PyArg_ParseTuple(args, "s#:compress", &input, &inplen))\r
        return NULL;\r
\r
    if (!(RetVal = PyString_FromStringAndSize(NULL, length)))\r
        return NULL;\r
\r
    ENTER_ZLIB\r
\r
    start_total_out = self->zst.total_out;\r
    self->zst.avail_in = inplen;\r
    self->zst.next_in = input;\r
    self->zst.avail_out = length;\r
    self->zst.next_out = (unsigned char *)PyString_AS_STRING(RetVal);\r
\r
    Py_BEGIN_ALLOW_THREADS\r
    err = deflate(&(self->zst), Z_NO_FLUSH);\r
    Py_END_ALLOW_THREADS\r
\r
    /* while Z_OK and the output buffer is full, there might be more output,\r
       so extend the output buffer and try again */\r
    while (err == Z_OK && self->zst.avail_out == 0) {\r
        if (_PyString_Resize(&RetVal, length << 1) < 0)\r
            goto error;\r
        self->zst.next_out = (unsigned char *)PyString_AS_STRING(RetVal) \\r
            + length;\r
        self->zst.avail_out = length;\r
        length = length << 1;\r
\r
        Py_BEGIN_ALLOW_THREADS\r
        err = deflate(&(self->zst), Z_NO_FLUSH);\r
        Py_END_ALLOW_THREADS\r
    }\r
    /* We will only get Z_BUF_ERROR if the output buffer was full but\r
       there wasn't more output when we tried again, so it is not an error\r
       condition.\r
    */\r
\r
    if (err != Z_OK && err != Z_BUF_ERROR) {\r
        zlib_error(self->zst, err, "while compressing");\r
        Py_DECREF(RetVal);\r
        RetVal = NULL;\r
        goto error;\r
    }\r
    _PyString_Resize(&RetVal, self->zst.total_out - start_total_out);\r
\r
 error:\r
    LEAVE_ZLIB\r
    return RetVal;\r
}\r
\r
/* Helper for objdecompress() and unflush(). Saves any unconsumed input data in\r
   self->unused_data or self->unconsumed_tail, as appropriate. */\r
static int\r
save_unconsumed_input(compobject *self, int err)\r
{\r
    if (err == Z_STREAM_END) {\r
        /* The end of the compressed data has been reached. Store the leftover\r
           input data in self->unused_data. */\r
        if (self->zst.avail_in > 0) {\r
            Py_ssize_t old_size = PyString_GET_SIZE(self->unused_data);\r
            Py_ssize_t new_size;\r
            PyObject *new_data;\r
            if (self->zst.avail_in > PY_SSIZE_T_MAX - old_size) {\r
                PyErr_NoMemory();\r
                return -1;\r
            }\r
            new_size = old_size + self->zst.avail_in;\r
            new_data = PyString_FromStringAndSize(NULL, new_size);\r
            if (new_data == NULL)\r
                return -1;\r
            Py_MEMCPY(PyString_AS_STRING(new_data),\r
                      PyString_AS_STRING(self->unused_data), old_size);\r
            Py_MEMCPY(PyString_AS_STRING(new_data) + old_size,\r
                      self->zst.next_in, self->zst.avail_in);\r
            Py_DECREF(self->unused_data);\r
            self->unused_data = new_data;\r
            self->zst.avail_in = 0;\r
        }\r
    }\r
    if (self->zst.avail_in > 0 || PyString_GET_SIZE(self->unconsumed_tail)) {\r
        /* This code handles two distinct cases:\r
           1. Output limit was reached. Save leftover input in unconsumed_tail.\r
           2. All input data was consumed. Clear unconsumed_tail. */\r
        PyObject *new_data = PyString_FromStringAndSize(\r
                (char *)self->zst.next_in, self->zst.avail_in);\r
        if (new_data == NULL)\r
            return -1;\r
        Py_DECREF(self->unconsumed_tail);\r
        self->unconsumed_tail = new_data;\r
    }\r
    return 0;\r
}\r
\r
PyDoc_STRVAR(decomp_decompress__doc__,\r
"decompress(data, max_length) -- Return a string containing the decompressed\n"\r
"version of the data.\n"\r
"\n"\r
"After calling this function, some of the input data may still be stored in\n"\r
"internal buffers for later processing.\n"\r
"Call the flush() method to clear these buffers.\n"\r
"If the max_length parameter is specified then the return value will be\n"\r
"no longer than max_length.  Unconsumed input data will be stored in\n"\r
"the unconsumed_tail attribute.");\r
\r
static PyObject *\r
PyZlib_objdecompress(compobject *self, PyObject *args)\r
{\r
    int err, inplen, max_length = 0;\r
    Py_ssize_t old_length, length = DEFAULTALLOC;\r
    PyObject *RetVal;\r
    Byte *input;\r
    unsigned long start_total_out;\r
\r
    if (!PyArg_ParseTuple(args, "s#|i:decompress", &input,\r
                          &inplen, &max_length))\r
        return NULL;\r
    if (max_length < 0) {\r
        PyErr_SetString(PyExc_ValueError,\r
                        "max_length must be greater than zero");\r
        return NULL;\r
    }\r
\r
    /* limit amount of data allocated to max_length */\r
    if (max_length && length > max_length)\r
        length = max_length;\r
    if (!(RetVal = PyString_FromStringAndSize(NULL, length)))\r
        return NULL;\r
\r
    ENTER_ZLIB\r
\r
    start_total_out = self->zst.total_out;\r
    self->zst.avail_in = inplen;\r
    self->zst.next_in = input;\r
    self->zst.avail_out = length;\r
    self->zst.next_out = (unsigned char *)PyString_AS_STRING(RetVal);\r
\r
    Py_BEGIN_ALLOW_THREADS\r
    err = inflate(&(self->zst), Z_SYNC_FLUSH);\r
    Py_END_ALLOW_THREADS\r
\r
    /* While Z_OK and the output buffer is full, there might be more output.\r
       So extend the output buffer and try again.\r
    */\r
    while (err == Z_OK && self->zst.avail_out == 0) {\r
        /* If max_length set, don't continue decompressing if we've already\r
           reached the limit.\r
        */\r
        if (max_length && length >= max_length)\r
            break;\r
\r
        /* otherwise, ... */\r
        old_length = length;\r
        length = length << 1;\r
        if (max_length && length > max_length)\r
            length = max_length;\r
\r
        if (_PyString_Resize(&RetVal, length) < 0)\r
            goto error;\r
        self->zst.next_out = (unsigned char *)PyString_AS_STRING(RetVal) \\r
            + old_length;\r
        self->zst.avail_out = length - old_length;\r
\r
        Py_BEGIN_ALLOW_THREADS\r
        err = inflate(&(self->zst), Z_SYNC_FLUSH);\r
        Py_END_ALLOW_THREADS\r
    }\r
\r
    if (save_unconsumed_input(self, err) < 0) {\r
        Py_DECREF(RetVal);\r
        RetVal = NULL;\r
        goto error;\r
    }\r
\r
    /* This is the logical place to call inflateEnd, but the old behaviour of\r
       only calling it on flush() is preserved. */\r
\r
    if (err != Z_STREAM_END && err != Z_OK && err != Z_BUF_ERROR) {\r
        /* We will only get Z_BUF_ERROR if the output buffer was full\r
           but there wasn't more output when we tried again, so it is\r
           not an error condition.\r
        */\r
        zlib_error(self->zst, err, "while decompressing");\r
        Py_DECREF(RetVal);\r
        RetVal = NULL;\r
        goto error;\r
    }\r
\r
    _PyString_Resize(&RetVal, self->zst.total_out - start_total_out);\r
\r
 error:\r
    LEAVE_ZLIB\r
\r
    return RetVal;\r
}\r
\r
PyDoc_STRVAR(comp_flush__doc__,\r
"flush( [mode] ) -- Return a string containing any remaining compressed data.\n"\r
"\n"\r
"mode can be one of the constants Z_SYNC_FLUSH, Z_FULL_FLUSH, Z_FINISH; the\n"\r
"default value used when mode is not specified is Z_FINISH.\n"\r
"If mode == Z_FINISH, the compressor object can no longer be used after\n"\r
"calling the flush() method.  Otherwise, more data can still be compressed.");\r
\r
static PyObject *\r
PyZlib_flush(compobject *self, PyObject *args)\r
{\r
    int err, length = DEFAULTALLOC;\r
    PyObject *RetVal;\r
    int flushmode = Z_FINISH;\r
    unsigned long start_total_out;\r
\r
    if (!PyArg_ParseTuple(args, "|i:flush", &flushmode))\r
        return NULL;\r
\r
    /* Flushing with Z_NO_FLUSH is a no-op, so there's no point in\r
       doing any work at all; just return an empty string. */\r
    if (flushmode == Z_NO_FLUSH) {\r
        return PyString_FromStringAndSize(NULL, 0);\r
    }\r
\r
    if (!(RetVal = PyString_FromStringAndSize(NULL, length)))\r
        return NULL;\r
\r
    ENTER_ZLIB\r
\r
    start_total_out = self->zst.total_out;\r
    self->zst.avail_in = 0;\r
    self->zst.avail_out = length;\r
    self->zst.next_out = (unsigned char *)PyString_AS_STRING(RetVal);\r
\r
    Py_BEGIN_ALLOW_THREADS\r
    err = deflate(&(self->zst), flushmode);\r
    Py_END_ALLOW_THREADS\r
\r
    /* while Z_OK and the output buffer is full, there might be more output,\r
       so extend the output buffer and try again */\r
    while (err == Z_OK && self->zst.avail_out == 0) {\r
        if (_PyString_Resize(&RetVal, length << 1) < 0)\r
            goto error;\r
        self->zst.next_out = (unsigned char *)PyString_AS_STRING(RetVal) \\r
            + length;\r
        self->zst.avail_out = length;\r
        length = length << 1;\r
\r
        Py_BEGIN_ALLOW_THREADS\r
        err = deflate(&(self->zst), flushmode);\r
        Py_END_ALLOW_THREADS\r
    }\r
\r
    /* If flushmode is Z_FINISH, we also have to call deflateEnd() to free\r
       various data structures. Note we should only get Z_STREAM_END when\r
       flushmode is Z_FINISH, but checking both for safety*/\r
    if (err == Z_STREAM_END && flushmode == Z_FINISH) {\r
        err = deflateEnd(&(self->zst));\r
        if (err != Z_OK) {\r
            zlib_error(self->zst, err, "from deflateEnd()");\r
            Py_DECREF(RetVal);\r
            RetVal = NULL;\r
            goto error;\r
        }\r
        else\r
            self->is_initialised = 0;\r
\r
        /* We will only get Z_BUF_ERROR if the output buffer was full\r
           but there wasn't more output when we tried again, so it is\r
           not an error condition.\r
        */\r
    } else if (err!=Z_OK && err!=Z_BUF_ERROR) {\r
        zlib_error(self->zst, err, "while flushing");\r
        Py_DECREF(RetVal);\r
        RetVal = NULL;\r
        goto error;\r
    }\r
\r
    _PyString_Resize(&RetVal, self->zst.total_out - start_total_out);\r
\r
 error:\r
    LEAVE_ZLIB\r
\r
    return RetVal;\r
}\r
\r
#ifdef HAVE_ZLIB_COPY\r
PyDoc_STRVAR(comp_copy__doc__,\r
"copy() -- Return a copy of the compression object.");\r
\r
static PyObject *\r
PyZlib_copy(compobject *self)\r
{\r
    compobject *retval = NULL;\r
    int err;\r
\r
    retval = newcompobject(&Comptype);\r
    if (!retval) return NULL;\r
\r
    /* Copy the zstream state\r
     * We use ENTER_ZLIB / LEAVE_ZLIB to make this thread-safe\r
     */\r
    ENTER_ZLIB\r
    err = deflateCopy(&retval->zst, &self->zst);\r
    switch(err) {\r
    case(Z_OK):\r
        break;\r
    case(Z_STREAM_ERROR):\r
        PyErr_SetString(PyExc_ValueError, "Inconsistent stream state");\r
        goto error;\r
    case(Z_MEM_ERROR):\r
        PyErr_SetString(PyExc_MemoryError,\r
                        "Can't allocate memory for compression object");\r
        goto error;\r
    default:\r
        zlib_error(self->zst, err, "while copying compression object");\r
        goto error;\r
    }\r
\r
    Py_INCREF(self->unused_data);\r
    Py_INCREF(self->unconsumed_tail);\r
    Py_XDECREF(retval->unused_data);\r
    Py_XDECREF(retval->unconsumed_tail);\r
    retval->unused_data = self->unused_data;\r
    retval->unconsumed_tail = self->unconsumed_tail;\r
\r
    /* Mark it as being initialized */\r
    retval->is_initialised = 1;\r
\r
    LEAVE_ZLIB\r
    return (PyObject *)retval;\r
\r
error:\r
    LEAVE_ZLIB\r
    Py_XDECREF(retval);\r
    return NULL;\r
}\r
\r
PyDoc_STRVAR(decomp_copy__doc__,\r
"copy() -- Return a copy of the decompression object.");\r
\r
static PyObject *\r
PyZlib_uncopy(compobject *self)\r
{\r
    compobject *retval = NULL;\r
    int err;\r
\r
    retval = newcompobject(&Decomptype);\r
    if (!retval) return NULL;\r
\r
    /* Copy the zstream state\r
     * We use ENTER_ZLIB / LEAVE_ZLIB to make this thread-safe\r
     */\r
    ENTER_ZLIB\r
    err = inflateCopy(&retval->zst, &self->zst);\r
    switch(err) {\r
    case(Z_OK):\r
        break;\r
    case(Z_STREAM_ERROR):\r
        PyErr_SetString(PyExc_ValueError, "Inconsistent stream state");\r
        goto error;\r
    case(Z_MEM_ERROR):\r
        PyErr_SetString(PyExc_MemoryError,\r
                        "Can't allocate memory for decompression object");\r
        goto error;\r
    default:\r
        zlib_error(self->zst, err, "while copying decompression object");\r
        goto error;\r
    }\r
\r
    Py_INCREF(self->unused_data);\r
    Py_INCREF(self->unconsumed_tail);\r
    Py_XDECREF(retval->unused_data);\r
    Py_XDECREF(retval->unconsumed_tail);\r
    retval->unused_data = self->unused_data;\r
    retval->unconsumed_tail = self->unconsumed_tail;\r
\r
    /* Mark it as being initialized */\r
    retval->is_initialised = 1;\r
\r
    LEAVE_ZLIB\r
    return (PyObject *)retval;\r
\r
error:\r
    LEAVE_ZLIB\r
    Py_XDECREF(retval);\r
    return NULL;\r
}\r
#endif\r
\r
PyDoc_STRVAR(decomp_flush__doc__,\r
"flush( [length] ) -- Return a string containing any remaining\n"\r
"decompressed data. length, if given, is the initial size of the\n"\r
"output buffer.\n"\r
"\n"\r
"The decompressor object can no longer be used after this call.");\r
\r
static PyObject *\r
PyZlib_unflush(compobject *self, PyObject *args)\r
{\r
    int err, length = DEFAULTALLOC;\r
    PyObject * retval = NULL;\r
    unsigned long start_total_out;\r
\r
    if (!PyArg_ParseTuple(args, "|i:flush", &length))\r
        return NULL;\r
    if (length <= 0) {\r
        PyErr_SetString(PyExc_ValueError, "length must be greater than zero");\r
        return NULL;\r
    }\r
    if (!(retval = PyString_FromStringAndSize(NULL, length)))\r
        return NULL;\r
\r
\r
    ENTER_ZLIB\r
\r
    start_total_out = self->zst.total_out;\r
    self->zst.avail_in = PyString_GET_SIZE(self->unconsumed_tail);\r
    self->zst.next_in = (Byte *)PyString_AS_STRING(self->unconsumed_tail);\r
    self->zst.avail_out = length;\r
    self->zst.next_out = (Byte *)PyString_AS_STRING(retval);\r
\r
    Py_BEGIN_ALLOW_THREADS\r
    err = inflate(&(self->zst), Z_FINISH);\r
    Py_END_ALLOW_THREADS\r
\r
    /* while Z_OK and the output buffer is full, there might be more output,\r
       so extend the output buffer and try again */\r
    while ((err == Z_OK || err == Z_BUF_ERROR) && self->zst.avail_out == 0) {\r
        if (_PyString_Resize(&retval, length << 1) < 0)\r
            goto error;\r
        self->zst.next_out = (Byte *)PyString_AS_STRING(retval) + length;\r
        self->zst.avail_out = length;\r
        length = length << 1;\r
\r
        Py_BEGIN_ALLOW_THREADS\r
        err = inflate(&(self->zst), Z_FINISH);\r
        Py_END_ALLOW_THREADS\r
    }\r
\r
    if (save_unconsumed_input(self, err) < 0) {\r
        Py_DECREF(retval);\r
        retval = NULL;\r
        goto error;\r
    }\r
\r
    /* If flushmode is Z_FINISH, we also have to call deflateEnd() to free\r
       various data structures. Note we should only get Z_STREAM_END when\r
       flushmode is Z_FINISH */\r
    if (err == Z_STREAM_END) {\r
        err = inflateEnd(&(self->zst));\r
        self->is_initialised = 0;\r
        if (err != Z_OK) {\r
            zlib_error(self->zst, err, "from inflateEnd()");\r
            Py_DECREF(retval);\r
            retval = NULL;\r
            goto error;\r
        }\r
    }\r
\r
    _PyString_Resize(&retval, self->zst.total_out - start_total_out);\r
\r
error:\r
\r
    LEAVE_ZLIB\r
\r
    return retval;\r
}\r
\r
static PyMethodDef comp_methods[] =\r
{\r
    {"compress", (binaryfunc)PyZlib_objcompress, METH_VARARGS,\r
                 comp_compress__doc__},\r
    {"flush", (binaryfunc)PyZlib_flush, METH_VARARGS,\r
              comp_flush__doc__},\r
#ifdef HAVE_ZLIB_COPY\r
    {"copy",  (PyCFunction)PyZlib_copy, METH_NOARGS,\r
              comp_copy__doc__},\r
#endif\r
    {NULL, NULL}\r
};\r
\r
static PyMethodDef Decomp_methods[] =\r
{\r
    {"decompress", (binaryfunc)PyZlib_objdecompress, METH_VARARGS,\r
                   decomp_decompress__doc__},\r
    {"flush", (binaryfunc)PyZlib_unflush, METH_VARARGS,\r
              decomp_flush__doc__},\r
#ifdef HAVE_ZLIB_COPY\r
    {"copy",  (PyCFunction)PyZlib_uncopy, METH_NOARGS,\r
              decomp_copy__doc__},\r
#endif\r
    {NULL, NULL}\r
};\r
\r
static PyObject *\r
Comp_getattr(compobject *self, char *name)\r
{\r
  /* No ENTER/LEAVE_ZLIB is necessary because this fn doesn't touch\r
     internal data. */\r
\r
  return Py_FindMethod(comp_methods, (PyObject *)self, name);\r
}\r
\r
static PyObject *\r
Decomp_getattr(compobject *self, char *name)\r
{\r
    PyObject * retval;\r
\r
    ENTER_ZLIB\r
\r
    if (strcmp(name, "unused_data") == 0) {\r
        Py_INCREF(self->unused_data);\r
        retval = self->unused_data;\r
    } else if (strcmp(name, "unconsumed_tail") == 0) {\r
        Py_INCREF(self->unconsumed_tail);\r
        retval = self->unconsumed_tail;\r
    } else\r
        retval = Py_FindMethod(Decomp_methods, (PyObject *)self, name);\r
\r
    LEAVE_ZLIB\r
\r
    return retval;\r
}\r
\r
PyDoc_STRVAR(adler32__doc__,\r
"adler32(string[, start]) -- Compute an Adler-32 checksum of string.\n"\r
"\n"\r
"An optional starting value can be specified.  The returned checksum is\n"\r
"a signed integer.");\r
\r
static PyObject *\r
PyZlib_adler32(PyObject *self, PyObject *args)\r
{\r
    unsigned int adler32val = 1;  /* adler32(0L, Z_NULL, 0) */\r
    Byte *buf;\r
    int len, signed_val;\r
\r
    if (!PyArg_ParseTuple(args, "s#|I:adler32", &buf, &len, &adler32val))\r
        return NULL;\r
    /* In Python 2.x we return a signed integer regardless of native platform\r
     * long size (the 32bit unsigned long is treated as 32-bit signed and sign\r
     * extended into a 64-bit long inside the integer object).  3.0 does the\r
     * right thing and returns unsigned. http://bugs.python.org/issue1202 */\r
    signed_val = adler32(adler32val, buf, len);\r
    return PyInt_FromLong(signed_val);\r
}\r
\r
PyDoc_STRVAR(crc32__doc__,\r
"crc32(string[, start]) -- Compute a CRC-32 checksum of string.\n"\r
"\n"\r
"An optional starting value can be specified.  The returned checksum is\n"\r
"a signed integer.");\r
\r
static PyObject *\r
PyZlib_crc32(PyObject *self, PyObject *args)\r
{\r
    unsigned int crc32val = 0;  /* crc32(0L, Z_NULL, 0) */\r
    Byte *buf;\r
    int len, signed_val;\r
\r
    if (!PyArg_ParseTuple(args, "s#|I:crc32", &buf, &len, &crc32val))\r
        return NULL;\r
    /* In Python 2.x we return a signed integer regardless of native platform\r
     * long size (the 32bit unsigned long is treated as 32-bit signed and sign\r
     * extended into a 64-bit long inside the integer object).  3.0 does the\r
     * right thing and returns unsigned. http://bugs.python.org/issue1202 */\r
    signed_val = crc32(crc32val, buf, len);\r
    return PyInt_FromLong(signed_val);\r
}\r
\r
\r
static PyMethodDef zlib_methods[] =\r
{\r
    {"adler32", (PyCFunction)PyZlib_adler32, METH_VARARGS,\r
                adler32__doc__},\r
    {"compress", (PyCFunction)PyZlib_compress,  METH_VARARGS,\r
                 compress__doc__},\r
    {"compressobj", (PyCFunction)PyZlib_compressobj, METH_VARARGS,\r
                    compressobj__doc__},\r
    {"crc32", (PyCFunction)PyZlib_crc32, METH_VARARGS,\r
              crc32__doc__},\r
    {"decompress", (PyCFunction)PyZlib_decompress, METH_VARARGS,\r
                   decompress__doc__},\r
    {"decompressobj", (PyCFunction)PyZlib_decompressobj, METH_VARARGS,\r
                   decompressobj__doc__},\r
    {NULL, NULL}\r
};\r
\r
static PyTypeObject Comptype = {\r
    PyVarObject_HEAD_INIT(0, 0)\r
    "zlib.Compress",\r
    sizeof(compobject),\r
    0,\r
    (destructor)Comp_dealloc,       /*tp_dealloc*/\r
    0,                              /*tp_print*/\r
    (getattrfunc)Comp_getattr,      /*tp_getattr*/\r
    0,                              /*tp_setattr*/\r
    0,                              /*tp_compare*/\r
    0,                              /*tp_repr*/\r
    0,                              /*tp_as_number*/\r
    0,                              /*tp_as_sequence*/\r
    0,                              /*tp_as_mapping*/\r
};\r
\r
static PyTypeObject Decomptype = {\r
    PyVarObject_HEAD_INIT(0, 0)\r
    "zlib.Decompress",\r
    sizeof(compobject),\r
    0,\r
    (destructor)Decomp_dealloc,     /*tp_dealloc*/\r
    0,                              /*tp_print*/\r
    (getattrfunc)Decomp_getattr,    /*tp_getattr*/\r
    0,                              /*tp_setattr*/\r
    0,                              /*tp_compare*/\r
    0,                              /*tp_repr*/\r
    0,                              /*tp_as_number*/\r
    0,                              /*tp_as_sequence*/\r
    0,                              /*tp_as_mapping*/\r
};\r
\r
PyDoc_STRVAR(zlib_module_documentation,\r
"The functions in this module allow compression and decompression using the\n"\r
"zlib library, which is based on GNU zip.\n"\r
"\n"\r
"adler32(string[, start]) -- Compute an Adler-32 checksum.\n"\r
"compress(string[, level]) -- Compress string, with compression level in 0-9.\n"\r
"compressobj([level]) -- Return a compressor object.\n"\r
"crc32(string[, start]) -- Compute a CRC-32 checksum.\n"\r
"decompress(string,[wbits],[bufsize]) -- Decompresses a compressed string.\n"\r
"decompressobj([wbits]) -- Return a decompressor object.\n"\r
"\n"\r
"'wbits' is window buffer size.\n"\r
"Compressor objects support compress() and flush() methods; decompressor\n"\r
"objects support decompress() and flush().");\r
\r
PyMODINIT_FUNC\r
PyInit_zlib(void)\r
{\r
    PyObject *m, *ver;\r
    Py_TYPE(&Comptype) = &PyType_Type;\r
    Py_TYPE(&Decomptype) = &PyType_Type;\r
    m = Py_InitModule4("zlib", zlib_methods,\r
                       zlib_module_documentation,\r
                       (PyObject*)NULL,PYTHON_API_VERSION);\r
    if (m == NULL)\r
        return;\r
\r
    ZlibError = PyErr_NewException("zlib.error", NULL, NULL);\r
    if (ZlibError != NULL) {\r
        Py_INCREF(ZlibError);\r
        PyModule_AddObject(m, "error", ZlibError);\r
    }\r
    PyModule_AddIntConstant(m, "MAX_WBITS", MAX_WBITS);\r
    PyModule_AddIntConstant(m, "DEFLATED", DEFLATED);\r
    PyModule_AddIntConstant(m, "DEF_MEM_LEVEL", DEF_MEM_LEVEL);\r
    PyModule_AddIntConstant(m, "Z_BEST_SPEED", Z_BEST_SPEED);\r
    PyModule_AddIntConstant(m, "Z_BEST_COMPRESSION", Z_BEST_COMPRESSION);\r
    PyModule_AddIntConstant(m, "Z_DEFAULT_COMPRESSION", Z_DEFAULT_COMPRESSION);\r
    PyModule_AddIntConstant(m, "Z_FILTERED", Z_FILTERED);\r
    PyModule_AddIntConstant(m, "Z_HUFFMAN_ONLY", Z_HUFFMAN_ONLY);\r
    PyModule_AddIntConstant(m, "Z_DEFAULT_STRATEGY", Z_DEFAULT_STRATEGY);\r
\r
    PyModule_AddIntConstant(m, "Z_FINISH", Z_FINISH);\r
    PyModule_AddIntConstant(m, "Z_NO_FLUSH", Z_NO_FLUSH);\r
    PyModule_AddIntConstant(m, "Z_SYNC_FLUSH", Z_SYNC_FLUSH);\r
    PyModule_AddIntConstant(m, "Z_FULL_FLUSH", Z_FULL_FLUSH);\r
\r
    ver = PyString_FromString(ZLIB_VERSION);\r
    if (ver != NULL)\r
        PyModule_AddObject(m, "ZLIB_VERSION", ver);\r
\r
    PyModule_AddStringConstant(m, "__version__", "1.0");\r
\r
#ifdef WITH_THREAD\r
    zlib_lock = PyThread_allocate_lock();\r
#endif /* WITH_THREAD */\r
}\r