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authorcvs2git <rtems-devel@rtems.org>2011-03-18 10:11:42 +0000
committercvs2git <rtems-devel@rtems.org>2011-03-18 10:11:42 +0000
commite371ea9949ecc8897f4cb34437cc6590a0fc51f0 (patch)
treee5d17499fe12fc87c9697d681b63b062e9cbb65a /cpukit/zlib/compress.c
parent83dcd23af45446b24fe12e5bce29432debe6d0b5 (diff)
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.c80
1 files changed, 80 insertions, 0 deletions
diff --git a/cpukit/zlib/compress.c b/cpukit/zlib/compress.c
new file mode 100644
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+++ b/cpukit/zlib/compress.c
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+/* 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;
+}