125 lines
2.5 KiB
Diff
125 lines
2.5 KiB
Diff
--- a/lib/Kconfig
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+++ b/lib/Kconfig
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@@ -233,6 +233,9 @@ config LZMA_COMPRESS
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config LZMA_DECOMPRESS
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tristate
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+config RLE_DECOMPRESS
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+ tristate
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+
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#
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# These all provide a common interface (hence the apparent duplication with
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# ZLIB_INFLATE; DECOMPRESS_GZIP is just a wrapper.)
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--- a/lib/Makefile
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+++ b/lib/Makefile
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@@ -97,6 +97,7 @@ obj-$(CONFIG_XZ_DEC) += xz/
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obj-$(CONFIG_RAID6_PQ) += raid6/
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obj-$(CONFIG_LZMA_COMPRESS) += lzma/
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obj-$(CONFIG_LZMA_DECOMPRESS) += lzma/
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+obj-$(CONFIG_RLE_DECOMPRESS) += rle.o
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lib-$(CONFIG_DECOMPRESS_GZIP) += decompress_inflate.o
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lib-$(CONFIG_DECOMPRESS_BZIP2) += decompress_bunzip2.o
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--- /dev/null
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+++ b/include/linux/rle.h
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@@ -0,0 +1,18 @@
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+#ifndef _RLE_H_
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+#define _RLE_H_
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+
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+#ifdef CONFIG_RLE_DECOMPRESS
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+int rle_decode(const unsigned char *src, size_t srclen,
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+ unsigned char *dst, size_t dstlen,
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+ size_t *src_done, size_t *dst_done);
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+#else
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+static inline int
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+rle_decode(const unsigned char *src, size_t srclen,
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+ unsigned char *dst, size_t dstlen,
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+ size_t *src_done, size_t *dst_done)
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+{
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+ return -ENOTSUPP;
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+}
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+#endif /* CONFIG_RLE_DECOMPRESS */
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+
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+#endif /* _RLE_H_ */
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--- /dev/null
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+++ b/lib/rle.c
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@@ -0,0 +1,78 @@
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+/*
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+ * RLE decoding routine
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+ *
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+ * Copyright (C) 2012 Gabor Juhos <juhosg@openwrt.org>
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+ *
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+ * This program is free software; you can redistribute it and/or modify it
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+ * under the terms of the GNU General Public License version 2 as published
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+ * by the Free Software Foundation.
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+ */
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+
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+#include <linux/kernel.h>
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+#include <linux/module.h>
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+#include <linux/rle.h>
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+
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+int rle_decode(const unsigned char *src, size_t srclen,
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+ unsigned char *dst, size_t dstlen,
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+ size_t *src_done, size_t *dst_done)
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+{
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+ size_t srcpos, dstpos;
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+ int ret;
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+
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+ srcpos = 0;
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+ dstpos = 0;
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+ ret = -EINVAL;
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+
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+ /* sanity checks */
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+ if (!src || !srclen || !dst || !dstlen)
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+ goto out;
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+
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+ while (1) {
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+ char count;
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+
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+ if (srcpos >= srclen)
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+ break;
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+
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+ count = (char) src[srcpos++];
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+ if (count == 0) {
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+ ret = 0;
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+ break;
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+ }
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+
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+ if (count > 0) {
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+ unsigned char c;
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+
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+ if (srcpos >= srclen)
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+ break;
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+
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+ c = src[srcpos++];
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+
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+ while (count--) {
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+ if (dstpos >= dstlen)
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+ break;
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+
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+ dst[dstpos++] = c;
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+ }
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+ } else {
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+ count *= -1;
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+
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+ while (count--) {
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+ if (srcpos >= srclen)
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+ break;
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+ if (dstpos >= dstlen)
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+ break;
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+ dst[dstpos++] = src[srcpos++];
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+ }
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+ }
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+ }
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+
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+out:
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+ if (src_done)
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+ *src_done = srcpos;
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+ if (dst_done)
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+ *dst_done = dstpos;
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+
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+ return ret;
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+}
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+
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+EXPORT_SYMBOL_GPL(rle_decode);
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