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author | cvs2git <rtems-devel@rtems.org> | 2011-03-18 10:11:42 +0000 |
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committer | cvs2git <rtems-devel@rtems.org> | 2011-03-18 10:11:42 +0000 |
commit | e371ea9949ecc8897f4cb34437cc6590a0fc51f0 (patch) | |
tree | e5d17499fe12fc87c9697d681b63b062e9cbb65a /cpukit/zlib/compress.c | |
parent | Ensure all version instances say 4.10. (diff) | |
download | rtems-4652f297baed549387c9b886c876f5135b909663.tar.bz2 |
This commit was manufactured by cvs2svn to create tag 'rtems-4-10-0'.4.10.0
Sprout from rtems-4-10-branch 2011-02-08 15:56:24 UTC Joel Sherrill <joel.sherrill@OARcorp.com> 'Ensure all version instances say 4.10.'
Cherrypick from rtems-4-10-branch 2011-03-18 10:11:41 UTC cvs2git <rtems-devel@rtems.org> 'This commit was manufactured by cvs2svn to create branch':
cpukit/zlib/ChangeLog
cpukit/zlib/ChangeLog.zlib
cpukit/zlib/FAQ
cpukit/zlib/Makefile.am
cpukit/zlib/README
cpukit/zlib/adler32.c
cpukit/zlib/compress.c
cpukit/zlib/crc32.c
cpukit/zlib/deflate.c
cpukit/zlib/deflate.h
cpukit/zlib/doc/algorithm.txt
cpukit/zlib/gzclose.c
cpukit/zlib/gzguts.h
cpukit/zlib/gzlib.c
cpukit/zlib/gzread.c
cpukit/zlib/gzwrite.c
cpukit/zlib/infback.c
cpukit/zlib/inffast.c
cpukit/zlib/inflate.c
cpukit/zlib/inflate.h
cpukit/zlib/inftrees.c
cpukit/zlib/inftrees.h
cpukit/zlib/trees.c
cpukit/zlib/uncompr.c
cpukit/zlib/zconf.h
cpukit/zlib/zlib.3
cpukit/zlib/zlib.h
cpukit/zlib/zutil.c
cpukit/zlib/zutil.h
testsuites/libtests/mathf/.cvsignore
testsuites/libtests/mathf/Makefile.am
testsuites/libtests/mathf/domathf.c
testsuites/libtests/mathf/init.c
testsuites/libtests/mathf/mathf.scn
Diffstat (limited to 'cpukit/zlib/compress.c')
-rw-r--r-- | cpukit/zlib/compress.c | 80 |
1 files changed, 80 insertions, 0 deletions
diff --git a/cpukit/zlib/compress.c b/cpukit/zlib/compress.c new file mode 100644 index 0000000000..ea4dfbe9d7 --- /dev/null +++ b/cpukit/zlib/compress.c @@ -0,0 +1,80 @@ +/* compress.c -- compress a memory buffer + * Copyright (C) 1995-2005 Jean-loup Gailly. + * For conditions of distribution and use, see copyright notice in zlib.h + */ + +/* @(#) $Id$ */ + +#define ZLIB_INTERNAL +#include "zlib.h" + +/* =========================================================================== + Compresses the source buffer into the destination buffer. The level + parameter has the same meaning as in deflateInit. sourceLen is the byte + length of the source buffer. Upon entry, destLen is the total size of the + destination buffer, which must be at least 0.1% larger than sourceLen plus + 12 bytes. Upon exit, destLen is the actual size of the compressed buffer. + + compress2 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, + Z_STREAM_ERROR if the level parameter is invalid. +*/ +int ZEXPORT compress2 (dest, destLen, source, sourceLen, level) + Bytef *dest; + uLongf *destLen; + const Bytef *source; + uLong sourceLen; + int level; +{ + z_stream stream; + int err; + + stream.next_in = (Bytef*)source; + stream.avail_in = (uInt)sourceLen; +#ifdef MAXSEG_64K + /* Check for source > 64K on 16-bit machine: */ + if ((uLong)stream.avail_in != sourceLen) return Z_BUF_ERROR; +#endif + 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; + stream.opaque = (voidpf)0; + + err = deflateInit(&stream, level); + if (err != Z_OK) return err; + + err = deflate(&stream, Z_FINISH); + if (err != Z_STREAM_END) { + deflateEnd(&stream); + return err == Z_OK ? Z_BUF_ERROR : err; + } + *destLen = stream.total_out; + + err = deflateEnd(&stream); + return err; +} + +/* =========================================================================== + */ +int ZEXPORT compress (dest, destLen, source, sourceLen) + Bytef *dest; + uLongf *destLen; + const Bytef *source; + uLong sourceLen; +{ + return compress2(dest, destLen, source, sourceLen, Z_DEFAULT_COMPRESSION); +} + +/* =========================================================================== + If the default memLevel or windowBits for deflateInit() is changed, then + this function needs to be updated. + */ +uLong ZEXPORT compressBound (sourceLen) + uLong sourceLen; +{ + return sourceLen + (sourceLen >> 12) + (sourceLen >> 14) + + (sourceLen >> 25) + 13; +} |