diff options
| author | juhosg <juhosg@3c298f89-4303-0410-b956-a3cf2f4a3e73> | 2012-09-08 17:51:54 +0000 |
|---|---|---|
| committer | juhosg <juhosg@3c298f89-4303-0410-b956-a3cf2f4a3e73> | 2012-09-08 17:51:54 +0000 |
| commit | 6142d590e33636eab99451f026fbb88161031ae0 (patch) | |
| tree | ec21302c0747929f6c710f09ecf0d269a1ff6eea /target/linux/ar71xx | |
| parent | 41be3a0bd3c75498ef641c1611201e18cb94150c (diff) | |
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
Diffstat (limited to 'target/linux/ar71xx')
| -rw-r--r-- | target/linux/ar71xx/config-3.3 | 1 | ||||
| -rw-r--r-- | target/linux/ar71xx/patches-3.3/310-lib-add-rle-decompression.patch | 114 |
2 files changed, 115 insertions, 0 deletions
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); |