1 files changed, 142 insertions, 0 deletions
diff --git a/lib/gzip.c b/lib/gzip.c
new file mode 100644
index 0000000..a83f4af
--- /dev/null
+++ b/lib/gzip.c
@@ -0,0 +1,142 @@
+/*
+ * (C) Copyright 2012
+ * Lei Wen <leiwen@marvell.com>, Marvell Inc.
+ *
+ * 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>
+#include "zlib/zutil.h"
+
+#ifndef CONFIG_GZIP_COMPRESS_DEF_SZ
+#define CONFIG_GZIP_COMPRESS_DEF_SZ	0x200
+#endif
+#define ZALLOC_ALIGNMENT		16
+
+static 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);
+}
+
+static void zfree(void *x, void *addr, unsigned nb)
+{
+	free (addr);
+}
+
+int gzip(void *dst, unsigned long *lenp,
+		unsigned char *src, unsigned long srclen)
+{
+	return zzip(dst, lenp, src, srclen, 1, NULL);
+}
+
+/*
+ * Compress blocks with zlib
+ */
+int zzip(void *dst, unsigned long *lenp, unsigned char *src,
+		unsigned long srclen, int stoponerr,
+		int (*func)(unsigned long, unsigned long))
+{
+	z_stream s;
+	int r, flush, orig, window;
+	unsigned long comp_len, left_len;
+
+	if (!srclen)
+		return 0;
+
+#ifndef CONFIG_GZIP
+	window = MAX_WBITS;
+#else
+	window = 2 * MAX_WBITS;
+#endif
+	orig = *lenp;
+	s.zalloc = zalloc;
+	s.zfree = zfree;
+	s.opaque = Z_NULL;
+
+	r = deflateInit2_(&s, Z_BEST_SPEED, Z_DEFLATED,	window,
+			DEF_MEM_LEVEL, Z_DEFAULT_STRATEGY,
+			ZLIB_VERSION, sizeof(z_stream));
+	if (r != Z_OK) {
+		printf ("Error: deflateInit2_() returned %d\n", r);
+		return -1;
+	}
+
+	while (srclen > 0) {
+		comp_len = (srclen > CONFIG_GZIP_COMPRESS_DEF_SZ) ?
+				CONFIG_GZIP_COMPRESS_DEF_SZ : srclen;
+
+		s.next_in = src;
+		s.avail_in = comp_len;
+		flush = (srclen > CONFIG_GZIP_COMPRESS_DEF_SZ)?
+			Z_NO_FLUSH : Z_FINISH;
+
+		do {
+			left_len = (*lenp > CONFIG_GZIP_COMPRESS_DEF_SZ) ?
+					CONFIG_GZIP_COMPRESS_DEF_SZ : *lenp;
+			s.next_out = dst;
+			s.avail_out = left_len;
+			r = deflate(&s, flush);
+			if (r == Z_STREAM_ERROR && stoponerr == 1) {
+				printf("Error: deflate() returned %d\n", r);
+				r = -1;
+				goto bail;
+			}
+			if (!func) {
+				dst += (left_len - s.avail_out);
+				*lenp -= (left_len - s.avail_out);
+			} else if (left_len - s.avail_out > 0) {
+				r = func((unsigned long)dst,
+					left_len - s.avail_out);
+				if (r < 0)
+					goto bail;
+			}
+		} while (s.avail_out == 0 && (*lenp > 0));
+		if (s.avail_in) {
+			printf("Deflate failed to consume %u bytes", s.avail_in);
+			r = -1;
+			goto bail;
+		}
+		if (*lenp == 0) {
+			printf("Deflate need more space to compress "
+				"left %lu bytes\n", srclen);
+			r = -1;
+			goto bail;
+		}
+		srclen -= comp_len;
+		src += comp_len;
+	}
+
+	r = 0;
+bail:
+	deflateEnd(&s);
+	*lenp = orig - *lenp;
+	return r;
+}