diff options
Diffstat (limited to 'sys/cddl/contrib/opensolaris/uts/common/zmod/zmod.c')
-rw-r--r-- | sys/cddl/contrib/opensolaris/uts/common/zmod/zmod.c | 109 |
1 files changed, 109 insertions, 0 deletions
diff --git a/sys/cddl/contrib/opensolaris/uts/common/zmod/zmod.c b/sys/cddl/contrib/opensolaris/uts/common/zmod/zmod.c new file mode 100644 index 0000000..2627239 --- /dev/null +++ b/sys/cddl/contrib/opensolaris/uts/common/zmod/zmod.c @@ -0,0 +1,109 @@ +/* + * CDDL HEADER START + * + * The contents of this file are subject to the terms of the + * Common Development and Distribution License (the "License"). + * You may not use this file except in compliance with the License. + * + * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE + * or http://www.opensolaris.org/os/licensing. + * See the License for the specific language governing permissions + * and limitations under the License. + * + * When distributing Covered Code, include this CDDL HEADER in each + * file and include the License file at usr/src/OPENSOLARIS.LICENSE. + * If applicable, add the following below this CDDL HEADER, with the + * fields enclosed by brackets "[]" replaced with your own identifying + * information: Portions Copyright [yyyy] [name of copyright owner] + * + * CDDL HEADER END + */ + +/* + * Copyright 2007 Sun Microsystems, Inc. All rights reserved. + * Use is subject to license terms. + */ + +#pragma ident "%Z%%M% %I% %E% SMI" + +#include <sys/types.h> +#include <sys/zmod.h> + +#include "zlib.h" + +/* + * Uncompress the buffer 'src' into the buffer 'dst'. The caller must store + * the expected decompressed data size externally so it can be passed in. + * The resulting decompressed size is then returned through dstlen. This + * function return Z_OK on success, or another error code on failure. + */ +int +z_uncompress(void *dst, size_t *dstlen, const void *src, size_t srclen) +{ + z_stream zs; + int err; + + bzero(&zs, sizeof (zs)); + zs.next_in = (uchar_t *)src; + zs.avail_in = srclen; + zs.next_out = dst; + zs.avail_out = *dstlen; + + if ((err = inflateInit(&zs)) != Z_OK) + return (err); + + if ((err = inflate(&zs, Z_FINISH)) != Z_STREAM_END) { + (void) inflateEnd(&zs); + return (err == Z_OK ? Z_BUF_ERROR : err); + } + + *dstlen = zs.total_out; + return (inflateEnd(&zs)); +} + +int +z_compress_level(void *dst, size_t *dstlen, const void *src, size_t srclen, + int level) +{ + + z_stream zs; + int err; + + bzero(&zs, sizeof (zs)); + zs.next_in = (uchar_t *)src; + zs.avail_in = srclen; + zs.next_out = dst; + zs.avail_out = *dstlen; + + if ((err = deflateInit(&zs, level)) != Z_OK) + return (err); + + if ((err = deflate(&zs, Z_FINISH)) != Z_STREAM_END) { + (void) deflateEnd(&zs); + return (err == Z_OK ? Z_BUF_ERROR : err); + } + + *dstlen = zs.total_out; + return (deflateEnd(&zs)); +} + +int +z_compress(void *dst, size_t *dstlen, const void *src, size_t srclen) +{ + return (z_compress_level(dst, dstlen, src, srclen, + Z_DEFAULT_COMPRESSION)); +} + +/* + * Convert a zlib error code into a string error message. + */ +const char * +z_strerror(int err) +{ + int i = Z_NEED_DICT - err; + + if (i < 0 || i > Z_NEED_DICT - Z_VERSION_ERROR) + return ("unknown error"); + + return (zError(err)); +} |