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-rw-r--r--uts/common/zmod/zmod.c113
1 files changed, 113 insertions, 0 deletions
diff --git a/uts/common/zmod/zmod.c b/uts/common/zmod/zmod.c
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index 000000000000..d22f5950826c
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+++ b/uts/common/zmod/zmod.c
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+/*
+ * 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 2008 Sun Microsystems, Inc. All rights reserved.
+ * Use is subject to license terms.
+ */
+
+#include <sys/modctl.h>
+#include <sys/zmod.h>
+
+#include "zlib.h"
+#include "zutil.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;
+
+ /*
+ * Call inflateInit2() specifying a window size of DEF_WBITS
+ * with the 6th bit set to indicate that the compression format
+ * type (zlib or gzip) should be automatically detected.
+ */
+ if ((err = inflateInit2(&zs, DEF_WBITS | 0x20)) != 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));
+}