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Separate utility functions

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topjohnwu
2017-03-04 21:16:59 +08:00
parent 9f91c8b59d
commit c6d4740b0c
8 changed files with 180 additions and 179 deletions
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117
jni/magiskboot/repack.c
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@@ -1,61 +1,41 @@
#include "magiskboot.h"
// Global pointer of output
static int ofd, opos;
static size_t restore(const char *filename, int fd) {
int ifd = open(filename, O_RDONLY);
if (ifd < 0)
error(1, "Cannot open %s\n", filename);
static size_t restore(const char *filename) {
int fd = open(filename, O_RDONLY);
if (fd < 0) {
fprintf(stderr, "Cannot open %s\n", filename);
exit(1);
size_t size = lseek(ifd, 0, SEEK_END);
lseek(ifd, 0, SEEK_SET);
if (sendfile(fd, ifd, NULL, size) != size) {
error(1, "Cannot write %s\n", filename);
}
size_t size = lseek(fd, 0, SEEK_END);
lseek(fd, 0, SEEK_SET);
if (sendfile(ofd, fd, NULL, size) < 0) {
fprintf(stderr, "Cannot write %s\n", filename);
exit(1);
}
close(fd);
opos += size;
close(ifd);
return size;
}
static void restore_buf(size_t size, const void *buf) {
if (write(ofd, buf, size) != size) {
fprintf(stderr, "Cannot dump from input file\n");
exit(1);
static void restore_buf(const void *buf, size_t size, int fd) {
if (write(fd, buf, size) != size) {
error(1, "Cannot dump from input file\n");
}
opos += size;
}
static void page_align() {
uint32_t pagemask = hdr.page_size - 1L;
if (opos & pagemask) {
opos += hdr.page_size - (opos & pagemask);
}
ftruncate(ofd, opos);
lseek(ofd, 0, SEEK_END);
}
void repack(const char* image) {
// Load original image
int ifd = open(image, O_RDONLY);
if (ifd < 0)
error(1, "Cannot open %s", image);
size_t isize = lseek(ifd, 0, SEEK_END);
lseek(ifd, 0, SEEK_SET);
unsigned char *orig = mmap(NULL, isize, PROT_READ, MAP_SHARED, ifd, 0);
// Parse original image
parse_img(orig, isize);
// Create new boot image
ofd = open("new-boot.img", O_RDWR | O_CREAT | O_TRUNC, 0644);
size_t size;
unsigned char *orig;
char name[PATH_MAX];
#define EXT_NUM 6
char *ext_list[EXT_NUM] = { "gz", "lzo", "xz", "lzma", "bz2", "lz4" };
// Load original image
mmap_ro(image, &orig, &size);
// Parse original image
parse_img(orig, size);
// Create new image
int fd = open_new("new-boot.img");
// Set all sizes to 0
hdr.kernel_size = 0;
hdr.ramdisk_size = 0;
@@ -63,39 +43,33 @@ void repack(const char* image) {
hdr.dt_size = 0;
// Skip a page for header
ftruncate(ofd, hdr.page_size);
lseek(ofd, 0, SEEK_END);
opos += hdr.page_size;
ftruncate(fd, hdr.page_size);
lseek(fd, 0, SEEK_END);
// Restore kernel
if (mtk_kernel) {
restore_buf(512, kernel);
restore_buf(kernel, 512, fd);
hdr.kernel_size += 512;
}
hdr.kernel_size += restore(KERNEL_FILE);
page_align();
hdr.kernel_size += restore(KERNEL_FILE, fd);
file_align(fd, hdr.page_size);
// Restore ramdisk
if (mtk_ramdisk) {
restore_buf(512, ramdisk);
restore_buf(ramdisk, 512, fd);
hdr.ramdisk_size += 512;
}
if (access(RAMDISK_FILE, R_OK) == 0) {
// If we found raw cpio, compress to original format
int rfd = open(RAMDISK_FILE, O_RDONLY);
if (rfd < 0)
error(1, "Cannot open " RAMDISK_FILE);
size_t cpio_size = lseek(rfd, 0, SEEK_END);
lseek(rfd, 0, SEEK_SET);
unsigned char *cpio = mmap(NULL, cpio_size, PROT_READ, MAP_SHARED, rfd, 0);
size_t cpio_size;
unsigned char *cpio;
mmap_ro(RAMDISK_FILE, &cpio, &cpio_size);
if (comp(ramdisk_type, RAMDISK_FILE, cpio, cpio_size))
error(1, "Unsupported format! Please compress manually!\n");
error(1, "Unsupported format! Please compress manually!");
munmap(cpio, cpio_size);
close(rfd);
}
int found = 0;
@@ -109,29 +83,28 @@ void repack(const char* image) {
if (!found)
error(1, "No ramdisk exists!");
hdr.ramdisk_size += restore(name);
page_align();
hdr.ramdisk_size += restore(name, fd);
file_align(fd, hdr.page_size);
// Restore second
if (access(SECOND_FILE, R_OK) == 0) {
hdr.second_size += restore(SECOND_FILE);
page_align();
hdr.second_size += restore(SECOND_FILE, fd);
file_align(fd, hdr.page_size);
}
// Restore dtb
if (access(DTB_FILE, R_OK) == 0) {
hdr.dt_size += restore(DTB_FILE);
page_align();
hdr.dt_size += restore(DTB_FILE, fd);
file_align(fd, hdr.page_size);
}
// Write header back
lseek(ofd, 0, SEEK_SET);
write(ofd, &hdr, sizeof(hdr));
lseek(fd, 0, SEEK_SET);
write(fd, &hdr, sizeof(hdr));
munmap(orig, isize);
close(ifd);
close(ofd);
if (opos > isize) {
munmap(orig, size);
if (lseek(fd, 0, SEEK_CUR) > size) {
error(2, "Boot partition too small!");
}
close(fd);
}