| | 1 | /* uncompr.c -- decompress a memory buffer |
| | 2 | * Copyright (C) 1995-2003, 2010 Jean-loup Gailly. |
| | 3 | * For conditions of distribution and use, see copyright notice in zlib.h |
| | 4 | */ |
| | 5 | |
| | 6 | |
| | 7 | #define ZLIB_INTERNAL |
| | 8 | #include "zlib.h" |
| | 9 | |
| | 10 | /* =========================================================================== |
| | 11 | Decompresses the source buffer into the destination buffer. sourceLen is |
| | 12 | the byte length of the source buffer. Upon entry, destLen is the total |
| | 13 | size of the destination buffer, which must be large enough to hold the |
| | 14 | entire uncompressed data. (The size of the uncompressed data must have |
| | 15 | been saved previously by the compressor and transmitted to the decompressor |
| | 16 | by some mechanism outside the scope of this compression library.) |
| | 17 | Upon exit, destLen is the actual size of the compressed buffer. |
| | 18 | |
| | 19 | uncompress returns Z_OK if success, Z_MEM_ERROR if there was not |
| | 20 | enough memory, Z_BUF_ERROR if there was not enough room in the output |
| | 21 | buffer, or Z_DATA_ERROR if the input data was corrupted. |
| | 22 | */ |
| | 23 | int ZEXPORT uncompress (dest, destLen, source, sourceLen) |
| | 24 | Bytef *dest; |
| | 25 | uLongf *destLen; |
| | 26 | const Bytef *source; |
| | 27 | uLong sourceLen; |
| | 28 | { |
| | 29 | z_stream stream; |
| | 30 | int err; |
| | 31 | |
| | 32 | stream.next_in = (z_const Bytef *)source; |
| | 33 | stream.avail_in = (uInt)sourceLen; |
| | 34 | /* Check for source > 64K on 16-bit machine: */ |
| | 35 | if ((uLong)stream.avail_in != sourceLen) return Z_BUF_ERROR; |
| | 36 | |
| | 37 | stream.next_out = dest; |
| | 38 | stream.avail_out = (uInt)*destLen; |
| | 39 | if ((uLong)stream.avail_out != *destLen) return Z_BUF_ERROR; |
| | 40 | |
| | 41 | stream.zalloc = (alloc_func)0; |
| | 42 | stream.zfree = (free_func)0; |
| | 43 | |
| | 44 | err = inflateInit(&stream); |
| | 45 | if (err != Z_OK) return err; |
| | 46 | |
| | 47 | err = inflate(&stream, Z_FINISH); |
| | 48 | if (err != Z_STREAM_END) { |
| | 49 | inflateEnd(&stream); |
| | 50 | if (err == Z_NEED_DICT || (err == Z_BUF_ERROR && stream.avail_in == 0)) |
| | 51 | return Z_DATA_ERROR; |
| | 52 | return err; |
| | 53 | } |
| | 54 | *destLen = stream.total_out; |
| | 55 | |
| | 56 | err = inflateEnd(&stream); |
| | 57 | return err; |
| | 58 | } |
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