From 6142d590e33636eab99451f026fbb88161031ae0 Mon Sep 17 00:00:00 2001
From: juhosg <juhosg@3c298f89-4303-0410-b956-a3cf2f4a3e73>
Date: Sat, 8 Sep 2012 17:51:54 +0000
Subject: ar71xx: add library code for RLE decoding
It will be used for the MikroTik boards.
git-svn-id: svn://svn.openwrt.org/openwrt/trunk@33337 3c298f89-4303-0410-b956-a3cf2f4a3e73
---
target/linux/ar71xx/config-3.3 | 1 +
.../310-lib-add-rle-decompression.patch | 114 +++++++++++++++++++++
2 files changed, 115 insertions(+)
create mode 100644 target/linux/ar71xx/patches-3.3/310-lib-add-rle-decompression.patch
diff --git a/target/linux/ar71xx/config-3.3 b/target/linux/ar71xx/config-3.3
index f3466130f..3b3ace506 100644
--- a/target/linux/ar71xx/config-3.3
+++ b/target/linux/ar71xx/config-3.3
@@ -188,6 +188,7 @@ CONFIG_PCI_DOMAINS=y
CONFIG_PERF_USE_VMALLOC=y
CONFIG_PHYLIB=y
# CONFIG_PREEMPT_RCU is not set
+# CONFIG_RLE_DECOMPRESS is not set
CONFIG_RTL8306_PHY=y
CONFIG_RTL8366RB_PHY=y
CONFIG_RTL8366S_PHY=y
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 000000000..0cb946229
--- /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);
--
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