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Add legacy lz4 mode support

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topjohnwu 2017-03-29 04:09:59 +08:00
parent 3f016f785f
commit 5aced279d6
4 changed files with 109 additions and 20 deletions
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92
jni/magiskboot/compress.c
View File

@ -1,10 +1,20 @@
#include <zlib.h>
#include <lzma.h>
#include <lz4.h>
#include <lz4frame.h>
#include <bzlib.h>
#include "magiskboot.h"
#define windowBits 15
#define ZLIB_GZIP 16
#define memLevel 8
#define CHUNK 0x40000
#define LZ4_HEADER_SIZE 19
#define LZ4_FOOTER_SIZE 4
#define LZ4_LEGACY_BLOCKSIZE 0x800000
static void write_file(const int fd, const void *buf, const size_t size, const char *filename) {
if (write(fd, buf, size) != size)
error(1, "Error in writing %s", filename);
@ -154,6 +164,7 @@ void lzma(int mode, const char* filename, const unsigned char* buf, size_t size)
} while (pos < size);
lzma_end(&strm);
close(fd);
}
// Mode: 0 = decode; 1 = encode
@ -265,6 +276,7 @@ void lz4(int mode, const char* filename, const unsigned char* buf, size_t size)
}
free(out);
close(fd);
}
// Mode: 0 = decode; 1 = encode
@ -335,6 +347,75 @@ void bzip2(int mode, const char* filename, const unsigned char* buf, size_t size
close(fd);
}
// Mode: 0 = decode; 1 = encode
void lz4_legacy(int mode, const char* filename, const unsigned char* buf, size_t size) {
size_t pos = 0;
int have;
char *out;
unsigned block_size, insize;
unsigned char block_size_le[4];
report(mode, filename);
int fd = open_new(filename);
switch(mode) {
case 0:
out = malloc(LZ4_LEGACY_BLOCKSIZE);
// Skip magic
pos += 4;
break;
case 1:
out = malloc(LZ4_COMPRESSBOUND(LZ4_LEGACY_BLOCKSIZE));
// Write magic
write_file(fd, "\x02\x21\x4c\x18", 4, filename);
break;
default:
error(1, "Unsupported lz4_legacy mode!");
}
if (!out)
error(1, "lz4_legacy malloc error");
do {
switch(mode) {
case 0:
block_size = buf[pos];
block_size += (buf[pos + 1]<<8);
block_size += (buf[pos + 2]<<16);
block_size += ((unsigned)buf[pos + 3])<<24;
pos += 4;
if (block_size > LZ4_COMPRESSBOUND(LZ4_LEGACY_BLOCKSIZE))
error(1, "lz4_legacy block size too large!");
have = LZ4_decompress_safe((const char*) (buf + pos), out, block_size, LZ4_LEGACY_BLOCKSIZE);
if (have < 0)
error(1, "Cannot decode lz4_legacy block");
pos += block_size;
break;
case 1:
if (pos + LZ4_LEGACY_BLOCKSIZE >= size)
insize = size - pos;
else
insize = LZ4_LEGACY_BLOCKSIZE;
have = LZ4_compress_default((const char*) (buf + pos), out, insize, LZ4_COMPRESSBOUND(LZ4_LEGACY_BLOCKSIZE));
if (have == 0)
error(1, "lz4_legacy compression error");
pos += insize;
block_size_le[0] = (unsigned char)have;
block_size_le[1] = (unsigned char)(have >> 8);
block_size_le[2] = (unsigned char)(have >> 16);
block_size_le[3] = (unsigned char)(have >> 24);
write_file(fd, block_size_le, 4, filename);
break;
}
// Write main data
write_file(fd, out, have, filename);
} while(pos < size);
free(out);
close(fd);
}
int decomp(file_t type, const char *to, const unsigned char *from, size_t size) {
switch (type) {
case GZIP:
@ -352,6 +433,9 @@ int decomp(file_t type, const char *to, const unsigned char *from, size_t size)
case LZ4:
lz4(0, to, from, size);
break;
case LZ4_LEGACY:
lz4_legacy(0, to, from, size);
break;
default:
// Unsupported
return 1;
@ -391,6 +475,11 @@ int comp(file_t type, const char *to, const unsigned char *from, size_t size) {
sprintf(name, "%s.%s", to, "lz4");
lz4(1, name, from, size);
break;
case LZ4_LEGACY:
if (strcmp(ext, ".lz4") != 0)
sprintf(name, "%s.%s", to, "lz4");
lz4_legacy(1, name, from, size);
break;
default:
// Unsupported
return 1;
@ -427,6 +516,7 @@ void decomp_file(char *from, const char *to) {
if (strcmp(ext, ".bz2") != 0)
ok = 0;
break;
case LZ4_LEGACY:
case LZ4:
if (strcmp(ext, ".lz4") != 0)
ok = 0;
@ -461,6 +551,8 @@ void comp_file(const char *method, const char *from, const char *to) {
type = LZMA;
} else if (strcmp(method, "lz4") == 0) {
type = LZ4;
} else if (strcmp(method, "lz4_legacy") == 0) {
type = LZ4_LEGACY;
} else if (strcmp(method, "bzip2") == 0) {
type = BZIP2;
} else {

22
jni/magiskboot/magiskboot.h
View File

@ -16,14 +16,6 @@
#include "bootimg.h"
#include "sha1.h"
#define windowBits 15
#define ZLIB_GZIP 16
#define memLevel 8
#define CHUNK 0x40000
#define LZ4_HEADER_SIZE 19
#define LZ4_FOOTER_SIZE 4
#define CHROMEOS_MAGIC "CHROMEOS"
#define CHROMEOS_MAGIC_SIZE 8
@ -33,9 +25,6 @@
#define DTB_FILE "dtb"
#define NEW_BOOT "new-boot.img"
#define SUP_LIST "gzip, xz, lzma, lz4, bzip2"
#define SUP_NUM 5
typedef enum {
UNKNOWN,
CHROMEOS,
@ -47,6 +36,7 @@ typedef enum {
LZMA,
BZIP2,
LZ4,
LZ4_LEGACY,
MTK,
QCDT,
} file_t;
@ -64,11 +54,14 @@ typedef enum {
RESTORE
} command_t;
#define SUP_LIST "gzip, xz, lzma, bzip2, lz4, lz4_legacy"
#define SUP_NUM 6
// Cannot declare in header, but place a copy here for convenience
// char *SUP_EXT_LIST[SUP_NUM] = { "gz", "xz", "lzma", "bz2", "lz4", "lz4" };
// file_t SUP_TYPE_LIST[SUP_NUM] = { GZIP, XZ, LZMA, BZIP2, LZ4, LZ4_LEGACY };
extern char *SUP_EXT_LIST[SUP_NUM];
extern file_t SUP_TYPE_LIST[SUP_NUM];
// Cannot declare in header, but place a copy here for convenience
// char *SUP_EXT_LIST[SUP_NUM] = { "gz", "xz", "lzma", "bz2", "lz4" };
// file_t SUP_TYPE_LIST[SUP_NUM] = { GZIP, XZ, LZMA, BZIP2, LZ4 };
// Vector
typedef struct vector {
@ -109,6 +102,7 @@ void gzip(int mode, const char* filename, const unsigned char* buf, size_t size)
void lzma(int mode, const char* filename, const unsigned char* buf, size_t size);
void lz4(int mode, const char* filename, const unsigned char* buf, size_t size);
void bzip2(int mode, const char* filename, const unsigned char* buf, size_t size);
void lz4_legacy(int mode, const char* filename, const unsigned char* buf, size_t size);
int comp(file_t type, const char *to, const unsigned char *from, size_t size);
void comp_file(const char *method, const char *from, const char *to);
int decomp(file_t type, const char *to, const unsigned char *from, size_t size);

13
jni/magiskboot/utils.c
View File

@ -1,8 +1,8 @@
#include "magiskboot.h"
#include "elf.h"
char *SUP_EXT_LIST[SUP_NUM] = { "gz", "xz", "lzma", "bz2", "lz4" };
file_t SUP_TYPE_LIST[SUP_NUM] = { GZIP, XZ, LZMA, BZIP2, LZ4 };
char *SUP_EXT_LIST[SUP_NUM] = { "gz", "xz", "lzma", "bz2", "lz4", "lz4" };
file_t SUP_TYPE_LIST[SUP_NUM] = { GZIP, XZ, LZMA, BZIP2, LZ4, LZ4_LEGACY };
void mmap_ro(const char *filename, unsigned char **buf, size_t *size) {
int fd = open(filename, O_RDONLY);
@ -42,10 +42,10 @@ file_t check_type(const unsigned char *buf) {
return LZMA;
} else if (memcmp(buf, "BZh", 3) == 0) {
return BZIP2;
} else if ( ( memcmp(buf, "\x04\x22\x4d\x18", 4) == 0
|| memcmp(buf, "\x03\x21\x4c\x18", 4) == 0)
|| memcmp(buf, "\x02\x21\x4c\x18", 4) == 0) {
} else if (memcmp(buf, "\x04\x22\x4d\x18", 4) == 0) {
return LZ4;
} else if (memcmp(buf, "\x02\x21\x4c\x18", 4) == 0) {
return LZ4_LEGACY;
} else if (memcmp(buf, "\x88\x16\x88\x58", 4) == 0) {
return MTK;
} else if (memcmp(buf, "QCDT", 4) == 0) {
@ -129,6 +129,9 @@ void print_info() {
case LZ4:
printf("COMPRESSION [%s]\n", "lz4");
break;
case LZ4_LEGACY:
printf("COMPRESSION [%s]\n", "lz4_legacy");
break;
default:
fprintf(stderr, "Unknown ramdisk format!\n");
}