739351d476
Change log:95336cb92b..191d55580eFull diff:95336cb92b..191d55580eRoll chromium third_party 4e16929f46..3a8f2a9e1e Change log:4e16929f46..3a8f2a9e1eChanged dependencies: * src/tools:c44a3f5eca..f524a53b81DEPS diff:95336cb92b..191d55580e/DEPS No update to Clang. TBR=titovartem@google.com, BUG=None CQ_INCLUDE_TRYBOTS=master.internal.tryserver.corp.webrtc:linux_internal Change-Id: Ic9c4a62b050383646e9fcf5cc07a5653c14ac06e Reviewed-on: https://webrtc-review.googlesource.com/76120 Reviewed-by: Patrik Höglund <phoglund@webrtc.org> Reviewed-by: Karl Wiberg <kwiberg@webrtc.org> Reviewed-by: Artem Titov <titovartem@webrtc.org> Commit-Queue: Artem Titov <titovartem@webrtc.org> Cr-Commit-Position: refs/heads/master@{#23205}
87 lines
2.6 KiB
C
87 lines
2.6 KiB
C
/* compress.c -- compress a memory buffer
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* Copyright (C) 1995-2005, 2014, 2016 Jean-loup Gailly, Mark Adler
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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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Compresses the source buffer into the destination buffer. The level
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parameter has the same meaning as in deflateInit. sourceLen is the byte
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length of the source buffer. Upon entry, destLen is the total size of the
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destination buffer, which must be at least 0.1% larger than sourceLen plus
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12 bytes. Upon exit, destLen is the actual size of the compressed buffer.
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compress2 returns Z_OK if success, Z_MEM_ERROR if there was not enough
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memory, Z_BUF_ERROR if there was not enough room in the output buffer,
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Z_STREAM_ERROR if the level parameter is invalid.
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*/
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int ZEXPORT compress2 (dest, destLen, source, sourceLen, level)
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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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int level;
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{
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z_stream stream;
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int err;
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const uInt max = (uInt)-1;
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uLong left;
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left = *destLen;
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*destLen = 0;
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stream.zalloc = (alloc_func)0;
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stream.zfree = (free_func)0;
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stream.opaque = (voidpf)0;
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err = deflateInit(&stream, level);
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if (err != Z_OK) return err;
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stream.next_out = dest;
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stream.avail_out = 0;
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stream.next_in = (z_const Bytef *)source;
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stream.avail_in = 0;
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do {
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if (stream.avail_out == 0) {
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stream.avail_out = left > (uLong)max ? max : (uInt)left;
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left -= stream.avail_out;
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}
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if (stream.avail_in == 0) {
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stream.avail_in = sourceLen > (uLong)max ? max : (uInt)sourceLen;
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sourceLen -= stream.avail_in;
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}
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err = deflate(&stream, sourceLen ? Z_NO_FLUSH : Z_FINISH);
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} while (err == Z_OK);
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*destLen = stream.total_out;
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deflateEnd(&stream);
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return err == Z_STREAM_END ? Z_OK : err;
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}
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/* ===========================================================================
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*/
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int ZEXPORT compress (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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return compress2(dest, destLen, source, sourceLen, Z_DEFAULT_COMPRESSION);
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}
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/* ===========================================================================
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If the default memLevel or windowBits for deflateInit() is changed, then
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this function needs to be updated.
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*/
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uLong ZEXPORT compressBound (sourceLen)
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uLong sourceLen;
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{
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return sourceLen + (sourceLen >> 12) + (sourceLen >> 14) +
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(sourceLen >> 25) + 13;
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}
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