mirror of
https://github.com/topjohnwu/Magisk.git
synced 2024-11-24 10:35:26 +00:00
111 lines
2.4 KiB
C
111 lines
2.4 KiB
C
#include "magiskboot.h"
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static size_t restore(const char *filename, int fd) {
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int ifd = open(filename, O_RDONLY);
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if (ifd < 0)
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error(1, "Cannot open %s\n", filename);
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size_t size = lseek(ifd, 0, SEEK_END);
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lseek(ifd, 0, SEEK_SET);
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if (sendfile(fd, ifd, NULL, size) != size) {
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error(1, "Cannot write %s\n", filename);
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}
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close(ifd);
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return size;
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}
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static void restore_buf(const void *buf, size_t size, int fd) {
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if (write(fd, buf, size) != size) {
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error(1, "Cannot dump from input file\n");
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}
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}
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void repack(const char* image) {
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size_t size;
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unsigned char *orig;
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char name[PATH_MAX];
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#define EXT_NUM 6
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char *ext_list[EXT_NUM] = { "gz", "lzo", "xz", "lzma", "bz2", "lz4" };
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// Load original image
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mmap_ro(image, &orig, &size);
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// Parse original image
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parse_img(orig, size);
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// Create new image
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int fd = open_new("new-boot.img");
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// Set all sizes to 0
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hdr.kernel_size = 0;
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hdr.ramdisk_size = 0;
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hdr.second_size = 0;
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hdr.dt_size = 0;
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// Skip a page for header
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ftruncate(fd, hdr.page_size);
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lseek(fd, 0, SEEK_END);
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// Restore kernel
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if (mtk_kernel) {
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restore_buf(kernel, 512, fd);
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hdr.kernel_size += 512;
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}
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hdr.kernel_size += restore(KERNEL_FILE, fd);
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file_align(fd, hdr.page_size);
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// Restore ramdisk
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if (mtk_ramdisk) {
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restore_buf(ramdisk, 512, fd);
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hdr.ramdisk_size += 512;
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}
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if (access(RAMDISK_FILE, R_OK) == 0) {
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// If we found raw cpio, compress to original format
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size_t cpio_size;
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unsigned char *cpio;
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mmap_ro(RAMDISK_FILE, &cpio, &cpio_size);
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if (comp(ramdisk_type, RAMDISK_FILE, cpio, cpio_size))
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error(1, "Unsupported format! Please compress manually!");
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munmap(cpio, cpio_size);
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}
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int found = 0;
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for (int i = 0; i < EXT_NUM; ++i) {
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sprintf(name, "%s.%s", RAMDISK_FILE, ext_list[i]);
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if (access(name, R_OK) == 0) {
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found = 1;
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break;
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}
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}
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if (!found)
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error(1, "No ramdisk exists!");
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hdr.ramdisk_size += restore(name, fd);
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file_align(fd, hdr.page_size);
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// Restore second
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if (access(SECOND_FILE, R_OK) == 0) {
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hdr.second_size += restore(SECOND_FILE, fd);
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file_align(fd, hdr.page_size);
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}
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// Restore dtb
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if (access(DTB_FILE, R_OK) == 0) {
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hdr.dt_size += restore(DTB_FILE, fd);
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file_align(fd, hdr.page_size);
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}
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// Write header back
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lseek(fd, 0, SEEK_SET);
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write(fd, &hdr, sizeof(hdr));
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munmap(orig, size);
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if (lseek(fd, 0, SEEK_CUR) > size) {
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error(2, "Boot partition too small!");
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}
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close(fd);
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}
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