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/*
* Copyright (C) 1998, 1999, 2000 by Bernhard Herzog.
*
* All Rights Reserved
*
* Permission to use, copy, modify, and distribute this software and
* its documentation for any purpose and without fee is hereby granted,
* provided that the above copyright notice appear in all copies and
* that both that copyright notice and this permission notice appear in
* supporting documentation, and that the name of the author not be
* used in advertising or publicity pertaining to distribution of the
* software without specific, written prior permission.
*
* THE AUTHOR DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
* INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN
* NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, INDIRECT OR
* CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS
* OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
* NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION
* WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <zlib.h>
#include "zlibfilter.h"
#define INBUFSIZE 1024
typedef struct {
char * buffer;
size_t buffer_length;
int eod_reached;
z_stream zstr;
} FlateDecodeState;
static size_t
read_zlib(void* clientdata, PyObject * source, char * buf, size_t length)
{
size_t bytesread = 0;
int result;
FlateDecodeState *state = (FlateDecodeState*)clientdata;
if (state->eod_reached)
return 0;
state->zstr.next_out = buf;
state->zstr.avail_out = length;
do
{
if (state->zstr.avail_in == 0)
{
state->zstr.next_in = state->buffer;
bytesread = Filter_Read(source, state->buffer,
state->buffer_length);
if (bytesread == 0)
{
if (PyErr_Occurred())
return 0;
}
state->zstr.avail_in = bytesread;
}
result = inflate(&state->zstr, Z_SYNC_FLUSH);
if (result == Z_STREAM_END)
{
state->eod_reached = 1;
}
else if (result != Z_OK)
{
if (state->zstr.msg == Z_NULL)
PyErr_Format(PyExc_IOError, "FlateDecode: Error %i", result);
else
PyErr_Format(PyExc_IOError, "FlateDecode: Error %i: %.200s",
result, state->zstr.msg);
return 0;
}
} while (state->zstr.avail_out == length && !state->eod_reached);
return length - state->zstr.avail_out;
}
static void
dealloc_zlib(void * clientdata)
{
FlateDecodeState * state = (FlateDecodeState*)clientdata;
inflateEnd(&state->zstr); /* XXX error handling */
PyMem_DEL(state);
}
PyObject *
Filter_FlateDecode(PyObject * self, PyObject * args)
{
PyObject * target;
FlateDecodeState * state;
int result;
if (!PyArg_ParseTuple(args, "O", &target))
return NULL;
state = PyMem_NEW(FlateDecodeState, 1);
if (!state)
return PyErr_NoMemory();
state->buffer = PyMem_NEW(char, INBUFSIZE);
if (!state->buffer)
{
PyMem_DEL(state);
return PyErr_NoMemory();
}
state->buffer_length = INBUFSIZE;
state->zstr.zalloc = NULL;
state->zstr.zfree = NULL;
state->zstr.opaque = NULL;
state->zstr.next_in = state->buffer;
state->zstr.avail_in = 0;
state->eod_reached = 0;
result = inflateInit(&state->zstr);
if (result != Z_OK)
{
if (result == Z_MEM_ERROR)
{
PyErr_SetString(PyExc_MemoryError,
"FlateDecode: No memory for z_stream");
}
else
{
if (state->zstr.msg == Z_NULL)
PyErr_Format(PyExc_IOError, "FlateDecode: Zlib Error %i",
result);
else
PyErr_Format(PyExc_IOError,
"FlateDecode: Zlib Error %i: %.200s",
result, state->zstr.msg);
}
PyMem_DEL(state->buffer);
PyMem_DEL(state);
return NULL;
}
return Filter_NewDecoder(target, "FlateDecode", 0, read_zlib,
NULL, dealloc_zlib, state);
}
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