nuclear@26: /* uncompr.c -- decompress a memory buffer
nuclear@26:  * Copyright (C) 1995-2003 Jean-loup Gailly.
nuclear@26:  * For conditions of distribution and use, see copyright notice in zlib.h
nuclear@26:  */
nuclear@26: 
nuclear@26: /* @(#) $Id$ */
nuclear@26: 
nuclear@26: #define ZLIB_INTERNAL
nuclear@26: #include "zlib.h"
nuclear@26: 
nuclear@26: /* ===========================================================================
nuclear@26:      Decompresses the source buffer into the destination buffer.  sourceLen is
nuclear@26:    the byte length of the source buffer. Upon entry, destLen is the total
nuclear@26:    size of the destination buffer, which must be large enough to hold the
nuclear@26:    entire uncompressed data. (The size of the uncompressed data must have
nuclear@26:    been saved previously by the compressor and transmitted to the decompressor
nuclear@26:    by some mechanism outside the scope of this compression library.)
nuclear@26:    Upon exit, destLen is the actual size of the compressed buffer.
nuclear@26:      This function can be used to decompress a whole file at once if the
nuclear@26:    input file is mmap'ed.
nuclear@26: 
nuclear@26:      uncompress returns Z_OK if success, Z_MEM_ERROR if there was not
nuclear@26:    enough memory, Z_BUF_ERROR if there was not enough room in the output
nuclear@26:    buffer, or Z_DATA_ERROR if the input data was corrupted.
nuclear@26: */
nuclear@26: int ZEXPORT uncompress (dest, destLen, source, sourceLen)
nuclear@26:     Bytef *dest;
nuclear@26:     uLongf *destLen;
nuclear@26:     const Bytef *source;
nuclear@26:     uLong sourceLen;
nuclear@26: {
nuclear@26:     z_stream stream;
nuclear@26:     int err;
nuclear@26: 
nuclear@26:     stream.next_in = (Bytef*)source;
nuclear@26:     stream.avail_in = (uInt)sourceLen;
nuclear@26:     /* Check for source > 64K on 16-bit machine: */
nuclear@26:     if ((uLong)stream.avail_in != sourceLen) return Z_BUF_ERROR;
nuclear@26: 
nuclear@26:     stream.next_out = dest;
nuclear@26:     stream.avail_out = (uInt)*destLen;
nuclear@26:     if ((uLong)stream.avail_out != *destLen) return Z_BUF_ERROR;
nuclear@26: 
nuclear@26:     stream.zalloc = (alloc_func)0;
nuclear@26:     stream.zfree = (free_func)0;
nuclear@26: 
nuclear@26:     err = inflateInit(&stream);
nuclear@26:     if (err != Z_OK) return err;
nuclear@26: 
nuclear@26:     err = inflate(&stream, Z_FINISH);
nuclear@26:     if (err != Z_STREAM_END) {
nuclear@26:         inflateEnd(&stream);
nuclear@26:         if (err == Z_NEED_DICT || (err == Z_BUF_ERROR && stream.avail_in == 0))
nuclear@26:             return Z_DATA_ERROR;
nuclear@26:         return err;
nuclear@26:     }
nuclear@26:     *destLen = stream.total_out;
nuclear@26: 
nuclear@26:     err = inflateEnd(&stream);
nuclear@26:     return err;
nuclear@26: }