| /* uncompr.c -- decompress a memory buffer |
| * Copyright (C) 1995-2003, 2010 Jean-loup Gailly. |
| * For conditions of distribution and use, see copyright notice in zlib.h |
| */ |
| |
| /* @(#) $Id$ */ |
| |
| #define ZLIB_INTERNAL |
| #include "zlib.h" |
| |
| /* =========================================================================== |
| Decompresses the source buffer into the destination buffer. sourceLen is |
| the byte length of the source buffer. Upon entry, destLen is the total |
| size of the destination buffer, which must be large enough to hold the |
| entire uncompressed data. (The size of the uncompressed data must have |
| been saved previously by the compressor and transmitted to the decompressor |
| by some mechanism outside the scope of this compression library.) |
| Upon exit, destLen is the actual size of the compressed buffer. |
| |
| uncompress returns Z_OK if success, Z_MEM_ERROR if there was not |
| enough memory, Z_BUF_ERROR if there was not enough room in the output |
| buffer, or Z_DATA_ERROR if the input data was corrupted. |
| */ |
| int ZEXPORT uncompress ( |
| Bytef *dest, |
| uLongf *destLen, |
| const Bytef *source, |
| uLong sourceLen) |
| { |
| z_stream stream; |
| int err; |
| |
| stream.next_in = (z_const Bytef *)source; |
| stream.avail_in = (uInt)sourceLen; |
| /* Check for source > 64K on 16-bit machine: */ |
| if ((uLong)stream.avail_in != sourceLen) return Z_BUF_ERROR; |
| |
| stream.next_out = dest; |
| stream.avail_out = (uInt)*destLen; |
| if ((uLong)stream.avail_out != *destLen) return Z_BUF_ERROR; |
| |
| stream.zalloc = (alloc_func)0; |
| stream.zfree = (free_func)0; |
| |
| err = inflateInit(&stream); |
| if (err != Z_OK) return err; |
| |
| err = inflate(&stream, Z_FINISH); |
| if (err != Z_STREAM_END) { |
| inflateEnd(&stream); |
| if (err == Z_NEED_DICT || (err == Z_BUF_ERROR && stream.avail_in == 0)) |
| return Z_DATA_ERROR; |
| return err; |
| } |
| *destLen = stream.total_out; |
| |
| err = inflateEnd(&stream); |
| return err; |
| } |