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/* $OpenBSD: uncompr.c,v 1.5 2003/12/16 22:33:02 henning Exp $ */ |
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/* uncompr.c -- decompress a memory buffer |
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* Copyright (C) 1995-2003 Jean-loup Gailly. |
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* For conditions of distribution and use, see copyright notice in zlib.h |
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*/ |
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#define ZLIB_INTERNAL |
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#include "zlib.h" |
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/* =========================================================================== |
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Decompresses the source buffer into the destination buffer. sourceLen is |
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the byte length of the source buffer. Upon entry, destLen is the total |
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size of the destination buffer, which must be large enough to hold the |
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entire uncompressed data. (The size of the uncompressed data must have |
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been saved previously by the compressor and transmitted to the decompressor |
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by some mechanism outside the scope of this compression library.) |
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Upon exit, destLen is the actual size of the compressed buffer. |
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This function can be used to decompress a whole file at once if the |
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input file is mmap'ed. |
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uncompress returns Z_OK if success, Z_MEM_ERROR if there was not |
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enough memory, Z_BUF_ERROR if there was not enough room in the output |
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buffer, or Z_DATA_ERROR if the input data was corrupted. |
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*/ |
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int ZEXPORT uncompress (dest, destLen, source, sourceLen) |
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Bytef *dest; |
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uLongf *destLen; |
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const Bytef *source; |
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uLong sourceLen; |
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{ |
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z_stream stream; |
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int err; |
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stream.next_in = (Bytef*)source; |
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stream.avail_in = (uInt)sourceLen; |
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/* Check for source > 64K on 16-bit machine: */ |
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if ((uLong)stream.avail_in != sourceLen) return Z_BUF_ERROR; |
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stream.next_out = dest; |
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stream.avail_out = (uInt)*destLen; |
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if ((uLong)stream.avail_out != *destLen) return Z_BUF_ERROR; |
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stream.zalloc = (alloc_func)0; |
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stream.zfree = (free_func)0; |
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err = inflateInit(&stream); |
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if (err != Z_OK) return err; |
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err = inflate(&stream, Z_FINISH); |
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if (err != Z_STREAM_END) { |
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inflateEnd(&stream); |
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if (err == Z_NEED_DICT || (err == Z_BUF_ERROR && stream.avail_in == 0)) |
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return Z_DATA_ERROR; |
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return err; |
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} |
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*destLen = stream.total_out; |
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err = inflateEnd(&stream); |
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return err; |
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} |