1 files changed, 80 insertions, 0 deletions
diff --git a/package/utils/rbextract/src/rle.c b/package/utils/rbextract/src/rle.c
new file mode 100644
index 0000000000..ca198ee9fc
--- /dev/null
+++ b/package/utils/rbextract/src/rle.c
@@ -0,0 +1,80 @@
+/*
+ *  RLE decoding routine
+ *
+ *  Copyright (C) 2012 Gabor Juhos <juhosg@openwrt.org>
+ *
+ *  This program is free software; you can redistribute it and/or modify it
+ *  under the terms of the GNU General Public License version 2 as published
+ *  by the Free Software Foundation.
+ */
+
+#include <stdio.h>
+#include <stddef.h>
+#include <stdint.h>
+#include <stdbool.h>
+#include <sys/types.h>
+ 
+#include "rle.h"
+
+int rle_decode(const unsigned char *src, size_t srclen,
+	       unsigned char *dst, size_t dstlen,
+	       size_t *src_done, size_t *dst_done)
+{
+	size_t srcpos, dstpos;
+	int ret;
+
+	srcpos = 0;
+	dstpos = 0;
+	ret = 1;
+
+	/* sanity checks */
+	if (!src || !srclen || !dst || !dstlen)
+		goto out;
+
+	while (1) {
+		signed char count;
+
+		if (srcpos >= srclen)
+			break;
+
+		count = (signed char) src[srcpos++];
+		if (count == 0) {
+			ret = 0;
+			break;
+		}
+
+		if (count > 0) {
+			unsigned char c;
+
+			if (srcpos >= srclen)
+				break;
+
+			c = src[srcpos++];
+
+			while (count--) {
+				if (dstpos >= dstlen)
+					break;
+
+				dst[dstpos++] = c;
+			}
+		} else {
+			count *= -1;
+
+			while (count--) {
+				if (srcpos >= srclen)
+					break;
+				if (dstpos >= dstlen)
+					break;
+				dst[dstpos++] = src[srcpos++];
+			}
+		}
+	}
+
+out:
+	if (src_done)
+		*src_done = srcpos;
+	if (dst_done)
+		*dst_done = dstpos;
+
+	return ret;
+}