1 files changed, 124 insertions, 0 deletions
diff --git a/lib/gunzip.c b/lib/gunzip.c
new file mode 100644
index 0000000..d2b7ad4
--- /dev/null
+++ b/lib/gunzip.c
@@ -0,0 +1,124 @@
+/*
+ * (C) Copyright 2000-2006
+ * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * 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., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+#include <common.h>
+#include <watchdog.h>
+#include <command.h>
+#include <image.h>
+#include <malloc.h>
+#include <u-boot/zlib.h>
+
+#define	ZALLOC_ALIGNMENT	16
+#define HEAD_CRC		2
+#define EXTRA_FIELD		4
+#define ORIG_NAME		8
+#define COMMENT			0x10
+#define RESERVED		0xe0
+#define DEFLATED		8
+
+void *zalloc(void *, unsigned, unsigned);
+void zfree(void *, void *, unsigned);
+
+void *zalloc(void *x, unsigned items, unsigned size)
+{
+	void *p;
+
+	size *= items;
+	size = (size + ZALLOC_ALIGNMENT - 1) & ~(ZALLOC_ALIGNMENT - 1);
+
+	p = malloc (size);
+
+	return (p);
+}
+
+void zfree(void *x, void *addr, unsigned nb)
+{
+	free (addr);
+}
+
+int gunzip(void *dst, int dstlen, unsigned char *src, unsigned long *lenp)
+{
+	int i, flags;
+
+	/* skip header */
+	i = 10;
+	flags = src[3];
+	if (src[2] != DEFLATED || (flags & RESERVED) != 0) {
+		puts ("Error: Bad gzipped data\n");
+		return (-1);
+	}
+	if ((flags & EXTRA_FIELD) != 0)
+		i = 12 + src[10] + (src[11] << 8);
+	if ((flags & ORIG_NAME) != 0)
+		while (src[i++] != 0)
+			;
+	if ((flags & COMMENT) != 0)
+		while (src[i++] != 0)
+			;
+	if ((flags & HEAD_CRC) != 0)
+		i += 2;
+	if (i >= *lenp) {
+		puts ("Error: gunzip out of data in header\n");
+		return (-1);
+	}
+
+	return zunzip(dst, dstlen, src, lenp, 1, i);
+}
+
+/*
+ * Uncompress blocks compressed with zlib without headers
+ */
+int zunzip(void *dst, int dstlen, unsigned char *src, unsigned long *lenp,
+						int stoponerr, int offset)
+{
+	z_stream s;
+	int r;
+
+	s.zalloc = zalloc;
+	s.zfree = zfree;
+#if defined(CONFIG_HW_WATCHDOG) || defined(CONFIG_WATCHDOG)
+	s.outcb = (cb_func)WATCHDOG_RESET;
+#else
+	s.outcb = Z_NULL;
+#endif	/* CONFIG_HW_WATCHDOG */
+
+	r = inflateInit2(&s, -MAX_WBITS);
+	if (r != Z_OK) {
+		printf ("Error: inflateInit2() returned %d\n", r);
+		return -1;
+	}
+	s.next_in = src + offset;
+	s.avail_in = *lenp - offset;
+	s.next_out = dst;
+	s.avail_out = dstlen;
+	r = inflate(&s, Z_FINISH);
+	if ((r != Z_STREAM_END) && (stoponerr==1)) {
+		printf ("Error: inflate() returned %d\n", r);
+		inflateEnd(&s);
+		return (-1);
+	}
+	*lenp = s.next_out - (unsigned char *) dst;
+	inflateEnd(&s);
+
+	return 0;
+}