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42307a8f43
primarily of pointless $FreeBSD$ tags), sync most files in HEAD with those in the ZLIB branch. This minimizes the differences between HEAD and ZLIB and should simplify future imports. After this, there are only three files with local modifications (gzio.c, minigzip.c, and zconf.h) and two non-vendor files (Makefile, zopen.c). The rest exactly match the vendor distribution. PR: i386/76294 MFC after: 2 weeks
62 lines
2.0 KiB
C
62 lines
2.0 KiB
C
/* 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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/* @(#) $Id$ */
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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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}
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