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-rw-r--r--lib/Kconfig7
-rw-r--r--lib/Makefile2
-rw-r--r--lib/decompress.c5
-rw-r--r--lib/decompress_unlz4.c187
-rw-r--r--lib/lz4/Makefile1
-rw-r--r--lib/lz4/lz4_decompress.c2
6 files changed, 203 insertions, 1 deletions
diff --git a/lib/Kconfig b/lib/Kconfig
index f1ed53c..e9cdc8f 100644
--- a/lib/Kconfig
+++ b/lib/Kconfig
@@ -194,6 +194,9 @@ config LZO_COMPRESS
config LZO_DECOMPRESS
tristate
+config LZ4_DECOMPRESS
+ tristate
+
source "lib/xz/Kconfig"
#
@@ -218,6 +221,10 @@ config DECOMPRESS_LZO
select LZO_DECOMPRESS
tristate
+config DECOMPRESS_LZ4
+ select LZ4_DECOMPRESS
+ tristate
+
#
# Generic allocator support is selected if needed
#
diff --git a/lib/Makefile b/lib/Makefile
index 9afb4f7..326f6c7 100644
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -75,6 +75,7 @@ obj-$(CONFIG_REED_SOLOMON) += reed_solomon/
obj-$(CONFIG_BCH) += bch.o
obj-$(CONFIG_LZO_COMPRESS) += lzo/
obj-$(CONFIG_LZO_DECOMPRESS) += lzo/
+obj-$(CONFIG_LZ4_DECOMPRESS) += lz4/
obj-$(CONFIG_XZ_DEC) += xz/
obj-$(CONFIG_RAID6_PQ) += raid6/
@@ -83,6 +84,7 @@ lib-$(CONFIG_DECOMPRESS_BZIP2) += decompress_bunzip2.o
lib-$(CONFIG_DECOMPRESS_LZMA) += decompress_unlzma.o
lib-$(CONFIG_DECOMPRESS_XZ) += decompress_unxz.o
lib-$(CONFIG_DECOMPRESS_LZO) += decompress_unlzo.o
+lib-$(CONFIG_DECOMPRESS_LZ4) += decompress_unlz4.o
obj-$(CONFIG_TEXTSEARCH) += textsearch.o
obj-$(CONFIG_TEXTSEARCH_KMP) += ts_kmp.o
diff --git a/lib/decompress.c b/lib/decompress.c
index f8fdeda..4d1cd03 100644
--- a/lib/decompress.c
+++ b/lib/decompress.c
@@ -11,6 +11,7 @@
#include <linux/decompress/unxz.h>
#include <linux/decompress/inflate.h>
#include <linux/decompress/unlzo.h>
+#include <linux/decompress/unlz4.h>
#include <linux/types.h>
#include <linux/string.h>
@@ -31,6 +32,9 @@
#ifndef CONFIG_DECOMPRESS_LZO
# define unlzo NULL
#endif
+#ifndef CONFIG_DECOMPRESS_LZ4
+# define unlz4 NULL
+#endif
struct compress_format {
unsigned char magic[2];
@@ -45,6 +49,7 @@ static const struct compress_format compressed_formats[] __initconst = {
{ {0x5d, 0x00}, "lzma", unlzma },
{ {0xfd, 0x37}, "xz", unxz },
{ {0x89, 0x4c}, "lzo", unlzo },
+ { {0x02, 0x21}, "lz4", unlz4 },
{ {0, 0}, NULL, NULL }
};
diff --git a/lib/decompress_unlz4.c b/lib/decompress_unlz4.c
new file mode 100644
index 0000000..3e67cfad1
--- /dev/null
+++ b/lib/decompress_unlz4.c
@@ -0,0 +1,187 @@
+/*
+ * Wrapper for decompressing LZ4-compressed kernel, initramfs, and initrd
+ *
+ * Copyright (C) 2013, LG Electronics, Kyungsik Lee <kyungsik.lee@lge.com>
+ *
+ * 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.
+ */
+
+#ifdef STATIC
+#define PREBOOT
+#include "lz4/lz4_decompress.c"
+#else
+#include <linux/decompress/unlz4.h>
+#endif
+#include <linux/types.h>
+#include <linux/lz4.h>
+#include <linux/decompress/mm.h>
+#include <linux/compiler.h>
+
+#include <asm/unaligned.h>
+
+/*
+ * Note: Uncompressed chunk size is used in the compressor side
+ * (userspace side for compression).
+ * It is hardcoded because there is not proper way to extract it
+ * from the binary stream which is generated by the preliminary
+ * version of LZ4 tool so far.
+ */
+#define LZ4_DEFAULT_UNCOMPRESSED_CHUNK_SIZE (8 << 20)
+#define ARCHIVE_MAGICNUMBER 0x184C2102
+
+STATIC inline int INIT unlz4(u8 *input, int in_len,
+ int (*fill) (void *, unsigned int),
+ int (*flush) (void *, unsigned int),
+ u8 *output, int *posp,
+ void (*error) (char *x))
+{
+ int ret = -1;
+ size_t chunksize = 0;
+ size_t uncomp_chunksize = LZ4_DEFAULT_UNCOMPRESSED_CHUNK_SIZE;
+ u8 *inp;
+ u8 *inp_start;
+ u8 *outp;
+ int size = in_len;
+#ifdef PREBOOT
+ size_t out_len = get_unaligned_le32(input + in_len);
+#endif
+ size_t dest_len;
+
+
+ if (output) {
+ outp = output;
+ } else if (!flush) {
+ error("NULL output pointer and no flush function provided");
+ goto exit_0;
+ } else {
+ outp = large_malloc(uncomp_chunksize);
+ if (!outp) {
+ error("Could not allocate output buffer");
+ goto exit_0;
+ }
+ }
+
+ if (input && fill) {
+ error("Both input pointer and fill function provided,");
+ goto exit_1;
+ } else if (input) {
+ inp = input;
+ } else if (!fill) {
+ error("NULL input pointer and missing fill function");
+ goto exit_1;
+ } else {
+ inp = large_malloc(lz4_compressbound(uncomp_chunksize));
+ if (!inp) {
+ error("Could not allocate input buffer");
+ goto exit_1;
+ }
+ }
+ inp_start = inp;
+
+ if (posp)
+ *posp = 0;
+
+ if (fill)
+ fill(inp, 4);
+
+ chunksize = get_unaligned_le32(inp);
+ if (chunksize == ARCHIVE_MAGICNUMBER) {
+ inp += 4;
+ size -= 4;
+ } else {
+ error("invalid header");
+ goto exit_2;
+ }
+
+ if (posp)
+ *posp += 4;
+
+ for (;;) {
+
+ if (fill)
+ fill(inp, 4);
+
+ chunksize = get_unaligned_le32(inp);
+ if (chunksize == ARCHIVE_MAGICNUMBER) {
+ inp += 4;
+ size -= 4;
+ if (posp)
+ *posp += 4;
+ continue;
+ }
+ inp += 4;
+ size -= 4;
+
+ if (posp)
+ *posp += 4;
+
+ if (fill) {
+ if (chunksize > lz4_compressbound(uncomp_chunksize)) {
+ error("chunk length is longer than allocated");
+ goto exit_2;
+ }
+ fill(inp, chunksize);
+ }
+#ifdef PREBOOT
+ if (out_len >= uncomp_chunksize) {
+ dest_len = uncomp_chunksize;
+ out_len -= dest_len;
+ } else
+ dest_len = out_len;
+ ret = lz4_decompress(inp, &chunksize, outp, dest_len);
+#else
+ dest_len = uncomp_chunksize;
+ ret = lz4_decompress_unknownoutputsize(inp, chunksize, outp,
+ &dest_len);
+#endif
+ if (ret < 0) {
+ error("Decoding failed");
+ goto exit_2;
+ }
+
+ if (flush && flush(outp, dest_len) != dest_len)
+ goto exit_2;
+ if (output)
+ outp += dest_len;
+ if (posp)
+ *posp += chunksize;
+
+ size -= chunksize;
+
+ if (size == 0)
+ break;
+ else if (size < 0) {
+ error("data corrupted");
+ goto exit_2;
+ }
+
+ inp += chunksize;
+ if (fill)
+ inp = inp_start;
+ }
+
+ ret = 0;
+exit_2:
+ if (!input)
+ large_free(inp_start);
+exit_1:
+ if (!output)
+ large_free(outp);
+exit_0:
+ return ret;
+}
+
+#ifdef PREBOOT
+STATIC int INIT decompress(unsigned char *buf, int in_len,
+ int(*fill)(void*, unsigned int),
+ int(*flush)(void*, unsigned int),
+ unsigned char *output,
+ int *posp,
+ void(*error)(char *x)
+ )
+{
+ return unlz4(buf, in_len - 4, fill, flush, output, posp, error);
+}
+#endif
diff --git a/lib/lz4/Makefile b/lib/lz4/Makefile
new file mode 100644
index 0000000..7f548c6
--- /dev/null
+++ b/lib/lz4/Makefile
@@ -0,0 +1 @@
+obj-$(CONFIG_LZ4_DECOMPRESS) += lz4_decompress.o
diff --git a/lib/lz4/lz4_decompress.c b/lib/lz4/lz4_decompress.c
index dcc8975..d3414ea 100644
--- a/lib/lz4/lz4_decompress.c
+++ b/lib/lz4/lz4_decompress.c
@@ -1,7 +1,7 @@
/*
* LZ4 Decompressor for Linux kernel
*
- * Copyright (C) 2013 LG Electronics Co., Ltd. (http://www.lge.com/)
+ * Copyright (C) 2013, LG Electronics, Kyungsik Lee <kyungsik.lee@lge.com>
*
* Based on LZ4 implementation by Yann Collet.
*