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authorGabor Juhos <juhosg@openwrt.org>2012-09-08 17:51:54 +0000
committerGabor Juhos <juhosg@openwrt.org>2012-09-08 17:51:54 +0000
commit73df240bb3bca4d5cc81322105eaa836abc4e6f9 (patch)
treec588ae782549c4b0164b1006c2b0fbd7a2dfacdf /target/linux/ar71xx/patches-3.3
parentf4be8a76ded14beac436192fa163d090a821b48b (diff)
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ar71xx: add library code for RLE decoding
It will be used for the MikroTik boards. SVN-Revision: 33337
Diffstat (limited to 'target/linux/ar71xx/patches-3.3')
-rw-r--r--target/linux/ar71xx/patches-3.3/310-lib-add-rle-decompression.patch114
1 files changed, 114 insertions, 0 deletions
diff --git a/target/linux/ar71xx/patches-3.3/310-lib-add-rle-decompression.patch b/target/linux/ar71xx/patches-3.3/310-lib-add-rle-decompression.patch
new file mode 100644
index 0000000..0cb9462
--- /dev/null
+++ b/target/linux/ar71xx/patches-3.3/310-lib-add-rle-decompression.patch
@@ -0,0 +1,114 @@
+--- a/lib/Kconfig
++++ b/lib/Kconfig
+@@ -124,6 +124,9 @@ config LZMA_COMPRESS
+ config LZMA_DECOMPRESS
+ tristate
+
++config RLE_DECOMPRESS
++ tristate
++
+ #
+ # These all provide a common interface (hence the apparent duplication with
+ # ZLIB_INFLATE; DECOMPRESS_GZIP is just a wrapper.)
+--- a/lib/Makefile
++++ b/lib/Makefile
+@@ -85,6 +85,7 @@ obj-$(CONFIG_XZ_DEC) += xz/
+ obj-$(CONFIG_RAID6_PQ) += raid6/
+ obj-$(CONFIG_LZMA_COMPRESS) += lzma/
+ obj-$(CONFIG_LZMA_DECOMPRESS) += lzma/
++obj-$(CONFIG_RLE_DECOMPRESS) += rle.o
+
+ lib-$(CONFIG_DECOMPRESS_GZIP) += decompress_inflate.o
+ lib-$(CONFIG_DECOMPRESS_BZIP2) += decompress_bunzip2.o
+--- /dev/null
++++ b/include/linux/rle.h
+@@ -0,0 +1,8 @@
++#ifndef _RLE_H_
++#define _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);
++
++#endif /* _RLE_H_ */
+--- /dev/null
++++ b/lib/rle.c
+@@ -0,0 +1,78 @@
++/*
++ * 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 <linux/kernel.h>
++#include <linux/module.h>
++#include <linux/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 = -EINVAL;
++
++ /* sanity checks */
++ if (!src || !srclen || !dst || !dstlen)
++ goto out;
++
++ while (1) {
++ char count;
++
++ if (srcpos >= srclen)
++ break;
++
++ count = (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;
++}
++
++EXPORT_SYMBOL_GPL(rle_decode);