1 files changed, 60 insertions, 0 deletions
diff --git a/tools/libfsimage/zfs/zfs_lzjb.c b/tools/libfsimage/zfs/zfs_lzjb.c
new file mode 100644
index 0000000000..fc48a94038
--- /dev/null
+++ b/tools/libfsimage/zfs/zfs_lzjb.c
@@ -0,0 +1,60 @@
+/*
+ *  GRUB  --  GRand Unified Bootloader
+ *  Copyright (C) 1999,2000,2001,2002,2003,2004  Free Software Foundation, Inc.
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, write to the Free Software
+ *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+/*
+ * Copyright 2007 Sun Microsystems, Inc.  All rights reserved.
+ * Use is subject to license terms.
+ */
+
+#include "fsys_zfs.h"
+
+#define	MATCH_BITS	6
+#define	MATCH_MIN	3
+#define	OFFSET_MASK	((1 << (16 - MATCH_BITS)) - 1)
+
+
+/*ARGSUSED*/
+int
+lzjb_decompress(void *s_start, void *d_start, size_t s_len, size_t d_len)
+{
+	unsigned char *src = s_start;
+	unsigned char *dst = d_start;
+	unsigned char *d_end = (unsigned char *)d_start + d_len;
+	unsigned char *cpy;
+	unsigned char copymap = '\0';
+	int copymask = 1 << (NBBY - 1);
+
+	while (dst < d_end) {
+		if ((copymask <<= 1) == (1 << NBBY)) {
+			copymask = 1;
+			copymap = *src++;
+		}
+		if (copymap & (unsigned char)copymask) {
+			int mlen = (src[0] >> (NBBY - MATCH_BITS)) + MATCH_MIN;
+			int offset = ((src[0] << NBBY) | src[1]) & OFFSET_MASK;
+			src += 2;
+			if ((cpy = dst - offset) < (unsigned char *)d_start)
+				return (-1);
+			while (--mlen >= 0 && dst < d_end)
+				*dst++ = *cpy++;
+		} else {
+			*dst++ = *src++;
+		}
+	}
+	return (0);
+}