757 lines
21 KiB
C
757 lines
21 KiB
C
/* zlibmodule.c -- gzip-compatible data compression */
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#include "Python.h"
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#include "zlib.h"
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/* The following parameters are copied from zutil.h, version 0.95 */
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#define DEFLATED 8
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#if MAX_MEM_LEVEL >= 8
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# define DEF_MEM_LEVEL 8
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#else
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# define DEF_MEM_LEVEL MAX_MEM_LEVEL
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#endif
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#define DEF_WBITS MAX_WBITS
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/* The output buffer will be increased in chunks of ADDCHUNK bytes. */
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#define DEFAULTALLOC 16*1024
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#define PyInit_zlib initzlib
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staticforward PyTypeObject Comptype;
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staticforward PyTypeObject Decomptype;
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static PyObject *ZlibError;
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typedef struct
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{
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PyObject_HEAD
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z_stream zst;
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} compobject;
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static char compressobj__doc__[] =
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"compressobj() -- Return a compressor object.\n"
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"compressobj(level) -- Return a compressor object, using the given compression level.\n"
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;
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static char decompressobj__doc__[] =
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"decompressobj() -- Return a decompressor object.\n"
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"decompressobj(wbits) -- Return a decompressor object, setting the window buffer size to wbits.\n"
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;
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static compobject *
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newcompobject(type)
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PyTypeObject *type;
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{
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compobject *self;
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self = PyObject_NEW(compobject, type);
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if (self == NULL)
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return NULL;
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return self;
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}
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static char compress__doc__[] =
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"compress(string) -- Compress string using the default compression level, "
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"returning a string containing compressed data.\n"
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"compress(string, level) -- Compress string, using the chosen compression "
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"level (from 1 to 9). Return a string containing the compressed data.\n"
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;
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static PyObject *
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PyZlib_compress(self, args)
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PyObject *self;
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PyObject *args;
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{
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PyObject *ReturnVal;
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Byte *input, *output;
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int length, level=Z_DEFAULT_COMPRESSION, err;
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z_stream zst;
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if (!PyArg_ParseTuple(args, "s#|i", &input, &length, &level))
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return NULL;
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zst.avail_out=length+length/1000+12+1;
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output=(Byte*)malloc(zst.avail_out);
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if (output==NULL)
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{
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PyErr_SetString(PyExc_MemoryError,
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"Can't allocate memory to compress data");
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return NULL;
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}
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zst.zalloc=(alloc_func)NULL;
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zst.zfree=(free_func)Z_NULL;
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zst.next_out=(Byte *)output;
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zst.next_in =(Byte *)input;
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zst.avail_in=length;
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err=deflateInit(&zst, level);
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switch(err)
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{
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case(Z_OK):
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break;
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case(Z_MEM_ERROR):
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PyErr_SetString(PyExc_MemoryError,
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"Out of memory while compressing data");
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free(output);
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return NULL;
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break;
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case(Z_STREAM_ERROR):
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PyErr_SetString(ZlibError,
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"Bad compression level");
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free(output);
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return NULL;
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break;
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default:
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{
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char temp[500];
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if (zst.msg==Z_NULL) zst.msg="";
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sprintf(temp, "Error %i while compressing data [%s]", err, zst.msg);
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PyErr_SetString(ZlibError, temp);
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deflateEnd(&zst);
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free(output);
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return NULL;
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}
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break;
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}
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err=deflate(&zst, Z_FINISH);
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switch(err)
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{
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case(Z_STREAM_END):
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break;
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/* Are there other errors to be trapped here? */
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default:
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{
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char temp[500];
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if (zst.msg==Z_NULL) zst.msg="";
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sprintf(temp, "Error %i while compressing data [%s]", err, zst.msg);
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PyErr_SetString(ZlibError, temp);
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deflateEnd(&zst);
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free(output);
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return NULL;
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}
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}
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err=deflateEnd(&zst);
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if (err!=Z_OK)
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{
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char temp[500];
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if (zst.msg==Z_NULL) zst.msg="";
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sprintf(temp, "Error %i while finishing data compression [%s]",
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err, zst.msg);
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PyErr_SetString(ZlibError, temp);
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free(output);
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return NULL;
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}
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ReturnVal=PyString_FromStringAndSize((char *)output, zst.total_out);
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free(output);
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return ReturnVal;
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}
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static char decompress__doc__[] =
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"decompress(string) -- Decompress the data in string, returning a string containing the decompressed data.\n"
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"decompress(string, wbits) -- Decompress the data in string with a window buffer size of wbits.\n"
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"decompress(string, wbits, bufsize) -- Decompress the data in string with a window buffer size of wbits and an initial output buffer size of bufsize.\n"
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;
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static PyObject *
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PyZlib_decompress(self, args)
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PyObject *self;
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PyObject *args;
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{
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PyObject *result_str;
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Byte *input;
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int length, err;
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int wsize=DEF_WBITS, r_strlen=DEFAULTALLOC;
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z_stream zst;
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if (!PyArg_ParseTuple(args, "s#|ii", &input, &length, &wsize, &r_strlen))
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return NULL;
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zst.avail_in=length;
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zst.avail_out=r_strlen;
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if (!(result_str = PyString_FromStringAndSize(NULL, r_strlen)))
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{
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PyErr_SetString(PyExc_MemoryError,
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"Can't allocate memory to decompress data");
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return NULL;
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}
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zst.zalloc=(alloc_func)NULL;
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zst.zfree=(free_func)Z_NULL;
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zst.next_out=(Byte *)PyString_AsString(result_str);
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zst.next_in =(Byte *)input;
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err=inflateInit2(&zst, wsize);
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switch(err)
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{
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case(Z_OK):
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break;
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case(Z_MEM_ERROR):
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PyErr_SetString(PyExc_MemoryError,
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"Out of memory while decompressing data");
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return NULL;
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default:
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{
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char temp[500];
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if (zst.msg==Z_NULL) zst.msg="";
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sprintf(temp, "Error %i while preparing to decompress data [%s]",
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err, zst.msg);
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PyErr_SetString(ZlibError, temp);
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inflateEnd(&zst);
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return NULL;
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}
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}
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do
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{
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err=inflate(&zst, Z_FINISH);
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switch(err)
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{
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case(Z_STREAM_END):
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break;
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case(Z_OK):
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/* need more memory */
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if (_PyString_Resize(&result_str, r_strlen << 1) == -1)
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{
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PyErr_SetString(PyExc_MemoryError,
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"Out of memory while decompressing data");
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inflateEnd(&zst);
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return NULL;
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}
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zst.next_out = (unsigned char *)PyString_AsString(result_str) + r_strlen;
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zst.avail_out=r_strlen;
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r_strlen = r_strlen << 1;
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break;
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default:
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{
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char temp[500];
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if (zst.msg==Z_NULL) zst.msg="";
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sprintf(temp, "Error %i while decompressing data: [%s]",
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err, zst.msg);
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PyErr_SetString(ZlibError, temp);
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inflateEnd(&zst);
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return NULL;
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}
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}
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} while(err!=Z_STREAM_END);
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err=inflateEnd(&zst);
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if (err!=Z_OK)
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{
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char temp[500];
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if (zst.msg==Z_NULL) zst.msg="";
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sprintf(temp, "Error %i while finishing data decompression [%s]",
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err, zst.msg);
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PyErr_SetString(ZlibError, temp);
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return NULL;
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}
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_PyString_Resize(&result_str, zst.total_out);
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return result_str;
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}
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static PyObject *
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PyZlib_compressobj(selfptr, args)
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PyObject *selfptr;
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PyObject *args;
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{
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compobject *self;
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int level=Z_DEFAULT_COMPRESSION, method=DEFLATED;
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int wbits=MAX_WBITS, memLevel=DEF_MEM_LEVEL, strategy=0, err;
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if (!PyArg_ParseTuple(args, "|iiiii", &level, &method, &wbits,
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&memLevel, &strategy))
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return NULL;
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self=newcompobject(&Comptype);
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if (self==NULL) return(NULL);
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self->zst.zalloc=(alloc_func)NULL;
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self->zst.zfree=(free_func)Z_NULL;
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err=deflateInit2(&self->zst, level, method, wbits, memLevel, strategy);
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switch(err)
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{
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case (Z_OK):
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return (PyObject*)self;
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break;
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case (Z_MEM_ERROR):
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PyErr_SetString(PyExc_MemoryError,
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"Can't allocate memory for compression object");
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return NULL;
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break;
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case(Z_STREAM_ERROR):
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PyErr_SetString(PyExc_ValueError,
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"Invalid compression level");
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return NULL;
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break;
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default:
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{
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char temp[500];
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if (self->zst.msg==Z_NULL) self->zst.msg="";
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sprintf(temp, "Error %i while creating compression object [%s]",
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err, self->zst.msg);
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PyErr_SetString(ZlibError, temp);
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return NULL;
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break;
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}
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}
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}
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static PyObject *
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PyZlib_decompressobj(selfptr, args)
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PyObject *selfptr;
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PyObject *args;
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{
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int wbits=DEF_WBITS, err;
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compobject *self;
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if (!PyArg_ParseTuple(args, "|i", &wbits))
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{
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return NULL;
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}
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self=newcompobject(&Decomptype);
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if (self==NULL) return(NULL);
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self->zst.zalloc=(alloc_func)NULL;
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self->zst.zfree=(free_func)Z_NULL;
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err=inflateInit2(&self->zst, wbits);
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switch(err)
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{
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case (Z_OK):
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return (PyObject*)self;
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break;
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case (Z_MEM_ERROR):
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PyErr_SetString(PyExc_MemoryError,
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"Can't allocate memory for decompression object");
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return NULL;
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break;
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default:
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{
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char temp[500];
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if (self->zst.msg==Z_NULL) self->zst.msg="";
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sprintf(temp, "Error %i while creating decompression object [%s]",
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err, self->zst.msg);
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PyErr_SetString(ZlibError, temp);
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return NULL;
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break;
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}
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}
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}
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static void
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Comp_dealloc(self)
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compobject *self;
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{
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int err;
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err=deflateEnd(&self->zst); /* Deallocate zstream structure */
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}
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static void
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Decomp_dealloc(self)
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compobject *self;
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{
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int err;
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err=inflateEnd(&self->zst); /* Deallocate zstream structure */
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}
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static char comp_compress__doc__[] =
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"compress(data) -- Return a string containing a compressed version of the data.\n\n"
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"After calling this function, some of the input data may still\n"
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"be stored in internal buffers for later processing.\n"
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"Call the flush() method to clear these buffers."
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;
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static PyObject *
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PyZlib_objcompress(self, args)
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compobject *self;
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PyObject *args;
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{
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int err = Z_OK, inplen;
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int length = DEFAULTALLOC;
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PyObject *RetVal;
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Byte *input;
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if (!PyArg_ParseTuple(args, "s#", &input, &inplen))
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return NULL;
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self->zst.avail_in=inplen;
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self->zst.next_in=input;
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if (!(RetVal = PyString_FromStringAndSize(NULL, length))) {
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PyErr_SetString(PyExc_MemoryError,
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"Can't allocate memory to compress data");
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return NULL;
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}
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self->zst.next_out = (unsigned char *)PyString_AsString(RetVal);
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self->zst.avail_out = length;
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while (self->zst.avail_in != 0 && err == Z_OK)
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{
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err = deflate(&(self->zst), Z_NO_FLUSH);
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if (self->zst.avail_out <= 0) {
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if (_PyString_Resize(&RetVal, length << 1) == -1) {
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PyErr_SetString(PyExc_MemoryError,
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"Can't allocate memory to compress data");
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return NULL;
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}
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self->zst.next_out = (unsigned char *)PyString_AsString(RetVal) + length;
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self->zst.avail_out = length;
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length = length << 1;
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}
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}
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if (err != Z_OK)
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{
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char temp[500];
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if (self->zst.msg==Z_NULL) self->zst.msg="";
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sprintf(temp, "Error %i while compressing [%s]",
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err, self->zst.msg);
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PyErr_SetString(ZlibError, temp);
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return NULL;
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}
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_PyString_Resize(&RetVal, self->zst.total_out);
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return RetVal;
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}
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static char decomp_decompress__doc__[] =
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"decompress(data) -- Return a string containing the decompressed version of the data.\n\n"
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"After calling this function, some of the input data may still\n"
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"be stored in internal buffers for later processing.\n"
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"Call the flush() method to clear these buffers."
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;
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static PyObject *
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PyZlib_objdecompress(self, args)
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compobject *self;
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PyObject *args;
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{
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int length, err, inplen;
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PyObject *RetVal;
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Byte *input;
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if (!PyArg_ParseTuple(args, "s#", &input, &inplen))
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return NULL;
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RetVal = PyString_FromStringAndSize(NULL, DEFAULTALLOC);
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self->zst.avail_in=inplen;
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self->zst.next_in=input;
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self->zst.avail_out = length = DEFAULTALLOC;
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self->zst.next_out = (unsigned char *)PyString_AsString(RetVal);
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err = Z_OK;
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while (self->zst.avail_in != 0 && err == Z_OK)
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{
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err = inflate(&(self->zst), Z_NO_FLUSH);
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if (err == Z_OK && self->zst.avail_out <= 0)
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{
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if (_PyString_Resize(&RetVal, length << 1) == -1)
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{
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PyErr_SetString(PyExc_MemoryError,
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"Can't allocate memory to compress data");
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return NULL;
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}
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self->zst.next_out = (unsigned char *)PyString_AsString(RetVal) + length;
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self->zst.avail_out = length;
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length = length << 1;
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}
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}
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if (err!=Z_OK && err!=Z_STREAM_END)
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{
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char temp[500];
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if (self->zst.msg==Z_NULL) self->zst.msg="";
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sprintf(temp, "Error %i while decompressing [%s]",
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err, self->zst.msg);
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PyErr_SetString(ZlibError, temp);
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return NULL;
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}
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_PyString_Resize(&RetVal, self->zst.total_out);
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return RetVal;
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}
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static char comp_flush__doc__[] =
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"flush() -- Return a string containing any remaining compressed data. "
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"The compressor object can no longer be used after this call."
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;
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static PyObject *
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PyZlib_flush(self, args)
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compobject *self;
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PyObject *args;
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{
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int length=DEFAULTALLOC, err = Z_OK;
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PyObject *RetVal;
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if (!PyArg_NoArgs(args))
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return NULL;
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self->zst.avail_in = 0;
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self->zst.next_in = Z_NULL;
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if (!(RetVal = PyString_FromStringAndSize(NULL, length))) {
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PyErr_SetString(PyExc_MemoryError,
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"Can't allocate memory to compress data");
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return NULL;
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}
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self->zst.next_out = (unsigned char *)PyString_AsString(RetVal);
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self->zst.avail_out = length;
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while (err == Z_OK)
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{
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err = deflate(&(self->zst), Z_FINISH);
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if (self->zst.avail_out <= 0) {
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if (_PyString_Resize(&RetVal, length << 1) == -1) {
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PyErr_SetString(PyExc_MemoryError,
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"Can't allocate memory to compress data");
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return NULL;
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}
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self->zst.next_out = (unsigned char *)PyString_AsString(RetVal) + length;
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self->zst.avail_out = length;
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length = length << 1;
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}
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}
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if (err!=Z_STREAM_END) {
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char temp[500];
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if (self->zst.msg==Z_NULL) self->zst.msg="";
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sprintf(temp, "Error %i while compressing [%s]",
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err, self->zst.msg);
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PyErr_SetString(ZlibError, temp);
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return NULL;
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}
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err=deflateEnd(&(self->zst));
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if (err!=Z_OK) {
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char temp[500];
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if (self->zst.msg==Z_NULL) self->zst.msg="";
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sprintf(temp, "Error %i while flushing compression object [%s]",
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err, self->zst.msg);
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PyErr_SetString(ZlibError, temp);
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return NULL;
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}
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_PyString_Resize(&RetVal,
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(char *)self->zst.next_out - PyString_AsString(RetVal));
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return RetVal;
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}
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static char decomp_flush__doc__[] =
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"flush() -- Return a string containing any remaining decompressed data. "
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"The decompressor object can no longer be used after this call."
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;
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static PyObject *
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PyZlib_unflush(self, args)
|
|
compobject *self;
|
|
PyObject *args;
|
|
{
|
|
int length=0, err;
|
|
PyObject *RetVal;
|
|
|
|
if (!PyArg_NoArgs(args))
|
|
return NULL;
|
|
if (!(RetVal = PyString_FromStringAndSize(NULL, DEFAULTALLOC)))
|
|
{
|
|
PyErr_SetString(PyExc_MemoryError,
|
|
"Can't allocate memory to decompress data");
|
|
return NULL;
|
|
}
|
|
self->zst.avail_in=0;
|
|
self->zst.next_out = (unsigned char *)PyString_AsString(RetVal);
|
|
length = self->zst.avail_out = DEFAULTALLOC;
|
|
|
|
err = Z_OK;
|
|
while (err == Z_OK)
|
|
{
|
|
err = inflate(&(self->zst), Z_FINISH);
|
|
if (err == Z_OK && self->zst.avail_out == 0)
|
|
{
|
|
if (_PyString_Resize(&RetVal, length << 1) == -1)
|
|
{
|
|
PyErr_SetString(PyExc_MemoryError,
|
|
"Can't allocate memory to decompress data");
|
|
return NULL;
|
|
}
|
|
self->zst.next_out = (unsigned char *)PyString_AsString(RetVal) + length;
|
|
self->zst.avail_out = length;
|
|
length = length << 1;
|
|
}
|
|
}
|
|
if (err!=Z_STREAM_END)
|
|
{
|
|
char temp[500];
|
|
if (self->zst.msg==Z_NULL) self->zst.msg="";
|
|
sprintf(temp, "Error %i while decompressing [%s]",
|
|
err, self->zst.msg);
|
|
PyErr_SetString(ZlibError, temp);
|
|
return NULL;
|
|
}
|
|
err=inflateEnd(&(self->zst));
|
|
if (err!=Z_OK)
|
|
{
|
|
char temp[500];
|
|
if (self->zst.msg==Z_NULL) self->zst.msg="";
|
|
sprintf(temp, "Error %i while flushing decompression object [%s]",
|
|
err, self->zst.msg);
|
|
PyErr_SetString(ZlibError, temp);
|
|
return NULL;
|
|
}
|
|
_PyString_Resize(&RetVal,
|
|
(char *)self->zst.next_out - PyString_AsString(RetVal));
|
|
return RetVal;
|
|
}
|
|
|
|
static PyMethodDef comp_methods[] =
|
|
{
|
|
{"compress", (binaryfunc)PyZlib_objcompress, 1, comp_compress__doc__},
|
|
{"flush", (binaryfunc)PyZlib_flush, 0, comp_flush__doc__},
|
|
{NULL, NULL}
|
|
};
|
|
|
|
static PyMethodDef Decomp_methods[] =
|
|
{
|
|
{"decompress", (binaryfunc)PyZlib_objdecompress, 1, decomp_decompress__doc__},
|
|
{"flush", (binaryfunc)PyZlib_unflush, 0, decomp_flush__doc__},
|
|
{NULL, NULL}
|
|
};
|
|
|
|
static PyObject *
|
|
Comp_getattr(self, name)
|
|
compobject *self;
|
|
char *name;
|
|
{
|
|
return Py_FindMethod(comp_methods, (PyObject *)self, name);
|
|
}
|
|
|
|
static PyObject *
|
|
Decomp_getattr(self, name)
|
|
compobject *self;
|
|
char *name;
|
|
{
|
|
return Py_FindMethod(Decomp_methods, (PyObject *)self, name);
|
|
}
|
|
|
|
static char adler32__doc__[] =
|
|
"adler32(string) -- Compute an Adler-32 checksum of string, using "
|
|
"a default starting value, and returning an integer value.\n"
|
|
"adler32(string, value) -- Compute an Adler-32 checksum of string, using "
|
|
"the starting value provided, and returning an integer value\n"
|
|
;
|
|
|
|
static PyObject *
|
|
PyZlib_adler32(self, args)
|
|
PyObject *self, *args;
|
|
{
|
|
uLong adler32val=adler32(0L, Z_NULL, 0);
|
|
Byte *buf;
|
|
int len;
|
|
|
|
if (!PyArg_ParseTuple(args, "s#|l", &buf, &len, &adler32val))
|
|
{
|
|
return NULL;
|
|
}
|
|
adler32val=adler32(adler32val, buf, len);
|
|
return Py_BuildValue("l", adler32val);
|
|
}
|
|
|
|
static char crc32__doc__[] =
|
|
"crc32(string) -- Compute a CRC-32 checksum of string, using "
|
|
"a default starting value, and returning an integer value.\n"
|
|
"crc32(string, value) -- Compute a CRC-32 checksum of string, using "
|
|
"the starting value provided, and returning an integer value.\n"
|
|
;
|
|
|
|
static PyObject *
|
|
PyZlib_crc32(self, args)
|
|
PyObject *self, *args;
|
|
{
|
|
uLong crc32val=crc32(0L, Z_NULL, 0);
|
|
Byte *buf;
|
|
int len;
|
|
if (!PyArg_ParseTuple(args, "s#|l", &buf, &len, &crc32val))
|
|
{
|
|
return NULL;
|
|
}
|
|
crc32val=crc32(crc32val, buf, len);
|
|
return Py_BuildValue("l", crc32val);
|
|
}
|
|
|
|
|
|
static PyMethodDef zlib_methods[] =
|
|
{
|
|
{"adler32", (PyCFunction)PyZlib_adler32, 1, adler32__doc__},
|
|
{"compress", (PyCFunction)PyZlib_compress, 1, compress__doc__},
|
|
{"compressobj", (PyCFunction)PyZlib_compressobj, 1, compressobj__doc__},
|
|
{"crc32", (PyCFunction)PyZlib_crc32, 1, crc32__doc__},
|
|
{"decompress", (PyCFunction)PyZlib_decompress, 1, decompress__doc__},
|
|
{"decompressobj", (PyCFunction)PyZlib_decompressobj, 1, decompressobj__doc__},
|
|
{NULL, NULL}
|
|
};
|
|
|
|
statichere PyTypeObject Comptype = {
|
|
PyObject_HEAD_INIT(&PyType_Type)
|
|
0,
|
|
"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*/
|
|
};
|
|
|
|
statichere PyTypeObject Decomptype = {
|
|
PyObject_HEAD_INIT(&PyType_Type)
|
|
0,
|
|
"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*/
|
|
};
|
|
|
|
/* The following insint() routine was blatantly ripped off from
|
|
socketmodule.c */
|
|
|
|
/* Convenience routine to export an integer value.
|
|
For simplicity, errors (which are unlikely anyway) are ignored. */
|
|
static void
|
|
insint(d, name, value)
|
|
PyObject *d;
|
|
char *name;
|
|
int value;
|
|
{
|
|
PyObject *v = PyInt_FromLong((long) value);
|
|
if (v == NULL) {
|
|
/* Don't bother reporting this error */
|
|
PyErr_Clear();
|
|
}
|
|
else {
|
|
PyDict_SetItemString(d, name, v);
|
|
Py_DECREF(v);
|
|
}
|
|
}
|
|
|
|
static char zlib_module_documentation[]=
|
|
"The functions in this module allow compression and decompression "
|
|
"using the zlib library, which is based on GNU zip. \n\n"
|
|
"adler32(string) -- Compute an Adler-32 checksum.\n"
|
|
"adler32(string, start) -- Compute an Adler-32 checksum using a given starting value.\n"
|
|
"compress(string) -- Compress a string.\n"
|
|
"compress(string, level) -- Compress a string with the given level of compression (1--9).\n"
|
|
"compressobj([level]) -- Return a compressor object.\n"
|
|
"crc32(string) -- Compute a CRC-32 checksum.\n"
|
|
"crc32(string, start) -- Compute a CRC-32 checksum using a given starting value.\n"
|
|
"decompress(string,[wbites],[bufsize]) -- Decompresses a compressed string.\n"
|
|
"decompressobj([wbits]) -- Return a decompressor object (wbits=window buffer size).\n\n"
|
|
"Compressor objects support compress() and flush() methods; decompressor \n"
|
|
"objects support decompress() and flush()."
|
|
;
|
|
|
|
void
|
|
PyInit_zlib()
|
|
{
|
|
PyObject *m, *d;
|
|
m = Py_InitModule4("zlib", zlib_methods,
|
|
zlib_module_documentation,
|
|
(PyObject*)NULL,PYTHON_API_VERSION);
|
|
d = PyModule_GetDict(m);
|
|
ZlibError = Py_BuildValue("s", "zlib.error");
|
|
PyDict_SetItemString(d, "error", ZlibError);
|
|
insint(d, "MAX_WBITS", MAX_WBITS);
|
|
insint(d, "DEFLATED", DEFLATED);
|
|
insint(d, "DEF_MEM_LEVEL", DEF_MEM_LEVEL);
|
|
|
|
if (PyErr_Occurred())
|
|
Py_FatalError("can't initialize module zlib");
|
|
}
|