diff options
Diffstat (limited to 'target/linux/ar71xx/patches-4.4/310-lib-add-rle-decompression.patch')
| -rw-r--r-- | target/linux/ar71xx/patches-4.4/310-lib-add-rle-decompression.patch | 124 |
1 files changed, 124 insertions, 0 deletions
diff --git a/target/linux/ar71xx/patches-4.4/310-lib-add-rle-decompression.patch b/target/linux/ar71xx/patches-4.4/310-lib-add-rle-decompression.patch new file mode 100644 index 0000000000..e493bc1be9 --- /dev/null +++ b/target/linux/ar71xx/patches-4.4/310-lib-add-rle-decompression.patch @@ -0,0 +1,124 @@ +--- a/lib/Kconfig ++++ b/lib/Kconfig +@@ -245,6 +245,9 @@ 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 +@@ -110,6 +110,7 @@ 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 +1,18 @@ ++#ifndef _RLE_H_ ++#define _RLE_H_ ++ ++#ifdef CONFIG_RLE_DECOMPRESS ++int rle_decode(const unsigned char *src, size_t srclen, ++ unsigned char *dst, size_t dstlen, ++ size_t *src_done, size_t *dst_done); ++#else ++static inline int ++rle_decode(const unsigned char *src, size_t srclen, ++ unsigned char *dst, size_t dstlen, ++ size_t *src_done, size_t *dst_done) ++{ ++ return -ENOTSUPP; ++} ++#endif /* CONFIG_RLE_DECOMPRESS */ ++ ++#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); |