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author | peter <peter@FreeBSD.org> | 1996-08-18 17:54:27 +0000 |
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committer | peter <peter@FreeBSD.org> | 1996-08-18 17:54:27 +0000 |
commit | 70c83c0586d07013fa8b7756f44d5ec3839b1db0 (patch) | |
tree | ce8fa1b80a1478f3869ad9324fb5d62892f66e07 /lib/libz/compress.c | |
download | FreeBSD-src-70c83c0586d07013fa8b7756f44d5ec3839b1db0.zip FreeBSD-src-70c83c0586d07013fa8b7756f44d5ec3839b1db0.tar.gz |
Initial import of zlib-1.0.4
Diffstat (limited to 'lib/libz/compress.c')
-rw-r--r-- | lib/libz/compress.c | 57 |
1 files changed, 57 insertions, 0 deletions
diff --git a/lib/libz/compress.c b/lib/libz/compress.c new file mode 100644 index 0000000..590c451 --- /dev/null +++ b/lib/libz/compress.c @@ -0,0 +1,57 @@ +/* compress.c -- compress a memory buffer + * Copyright (C) 1995-1996 Jean-loup Gailly. + * For conditions of distribution and use, see copyright notice in zlib.h + */ + +/* $Id: compress.c,v 1.10 1996/05/23 16:51:12 me Exp $ */ + +#include "zlib.h" + +/* =========================================================================== + Compresses the source buffer into the destination buffer. 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 8 bytes. Upon exit, destLen is the actual size of the + compressed buffer. + This function can be used to compress a whole file at once if the + input file is mmap'ed. + compress 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. +*/ +int compress (dest, destLen, source, sourceLen) + Bytef *dest; + uLongf *destLen; + const Bytef *source; + uLong sourceLen; +{ + 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, Z_DEFAULT_COMPRESSION); + 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; +} |