diff --git a/common/filetype.c b/common/filetype.c index 1ff3dd202..13c7994df 100644 --- a/common/filetype.c +++ b/common/filetype.c @@ -33,6 +33,7 @@ static const struct filetype_str filetype_str[] = { [filetype_unknown] = { "unknown", "unkown" }, [filetype_arm_zimage] = { "arm Linux zImage", "arm-zimage" }, [filetype_lzo_compressed] = { "lzo compressed", "lzo" }, + [filetype_lz4_compressed] = { "lz4 compressed", "lz4" }, [filetype_arm_barebox] = { "arm barebox image", "arm-barebox" }, [filetype_uimage] = { "U-Boot uImage", "u-boot" }, [filetype_ubi] = { "UBI image", "ubi" }, @@ -195,6 +196,9 @@ enum filetype file_detect_type(const void *_buf, size_t bufsize) if (buf8[0] == 0x89 && buf8[1] == 0x4c && buf8[2] == 0x5a && buf8[3] == 0x4f) return filetype_lzo_compressed; + if (buf8[0] == 0x02 && buf8[1] == 0x21 && buf8[2] == 0x4c && + buf8[3] == 0x18) + return filetype_lz4_compressed; if (buf[0] == be32_to_cpu(0x27051956)) return filetype_uimage; if (buf[0] == 0x23494255) diff --git a/include/filetype.h b/include/filetype.h index c73c64aa6..1b9080599 100644 --- a/include/filetype.h +++ b/include/filetype.h @@ -10,6 +10,7 @@ enum filetype { filetype_unknown, filetype_arm_zimage, filetype_lzo_compressed, + filetype_lz4_compressed, filetype_arm_barebox, filetype_uimage, filetype_ubi, diff --git a/include/linux/decompress/unlz4.h b/include/linux/decompress/unlz4.h new file mode 100644 index 000000000..7aaafc2b1 --- /dev/null +++ b/include/linux/decompress/unlz4.h @@ -0,0 +1,10 @@ +#ifndef DECOMPRESS_UNLZ4_H +#define DECOMPRESS_UNLZ4_H + +int decompress_unlz4(unsigned char *inbuf, int len, + int(*fill)(void*, unsigned int), + int(*flush)(void*, unsigned int), + unsigned char *output, + int *pos, + void(*error)(char *x)); +#endif diff --git a/lib/Kconfig b/lib/Kconfig index 646fdb7d7..b5ac22a2a 100644 --- a/lib/Kconfig +++ b/lib/Kconfig @@ -14,6 +14,10 @@ config BZLIB bool "include bzip2 uncompression support" select UNCOMPRESS +config LZ4_DECOMPRESS + bool "include lz4 uncompression support" + select UNCOMPRESS + config GENERIC_FIND_NEXT_BIT def_bool n diff --git a/lib/Makefile b/lib/Makefile index 7c42537cc..61f1e63ae 100644 --- a/lib/Makefile +++ b/lib/Makefile @@ -28,8 +28,10 @@ obj-y += notifier.o obj-y += copy_file.o obj-y += random.o obj-y += lzo/ +obj-$(CONFIG_LZ4_DECOMPRESS) += lz4/ obj-y += show_progress.o obj-$(CONFIG_LZO_DECOMPRESS) += decompress_unlzo.o +obj-$(CONFIG_LZ4_DECOMPRESS) += decompress_unlz4.o obj-$(CONFIG_PROCESS_ESCAPE_SEQUENCE) += process_escape_sequence.o obj-$(CONFIG_UNCOMPRESS) += uncompress.o obj-$(CONFIG_BCH) += bch.o diff --git a/lib/decompress_unlz4.c b/lib/decompress_unlz4.c new file mode 100644 index 000000000..894cc37ab --- /dev/null +++ b/lib/decompress_unlz4.c @@ -0,0 +1,188 @@ +/* + * Wrapper for decompressing LZ4-compressed kernel, initramfs, and initrd + * + * Copyright (C) 2013, LG Electronics, Kyungsik Lee + * + * 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 +#include "lz4/lz4_decompress.c" +#else +#include +#include +#endif +#include +#include +#include +#include + +#include + +/* + * 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 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 = 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 = 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) + free(inp_start); +exit_1: + if (!output) + free(outp); +exit_0: + return ret; +} + +int decompress_unlz4(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); +} +#define decompress decompress_unlz4 diff --git a/lib/lz4/Makefile b/lib/lz4/Makefile new file mode 100644 index 000000000..7f548c6d1 --- /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 d3414eae7..8e64ce6ae 100644 --- a/lib/lz4/lz4_decompress.c +++ b/lib/lz4/lz4_decompress.c @@ -38,10 +38,11 @@ */ #ifndef STATIC -#include +#include #include #endif #include +#include #include diff --git a/lib/uncompress.c b/lib/uncompress.c index e0a69df9f..a4225aaeb 100644 --- a/lib/uncompress.c +++ b/lib/uncompress.c @@ -21,6 +21,7 @@ #include #include #include +#include #include #include #include @@ -111,6 +112,11 @@ int uncompress(unsigned char *inbuf, int len, case filetype_lzo_compressed: compfn = decompress_unlzo; break; +#endif +#ifdef CONFIG_LZ4_DECOMPRESS + case filetype_lz4_compressed: + compfn = decompress_unlz4; + break; #endif default: err = asprintf("cannot handle filetype %s", file_type_to_string(ft)); diff --git a/scripts/Makefile.lib b/scripts/Makefile.lib index ab12a38c8..f61e93194 100644 --- a/scripts/Makefile.lib +++ b/scripts/Makefile.lib @@ -289,6 +289,11 @@ cmd_xzmisc = (cat $(filter-out FORCE,$^) | \ xz --check=crc32 --lzma2=dict=1MiB) > $@ || \ (rm -f $@ ; false) +quiet_cmd_lz4 = LZ4 $@ +cmd_lz4 = (cat $(filter-out FORCE,$^) | \ + lz4c -l -c1 stdin stdout && $(call size_append, $(filter-out FORCE,$^))) > $@ || \ + (rm -f $@ ; false) + quiet_cmd_disasm = DISASM $@ cmd_disasm = $(OBJDUMP) -d $< > $@