140 lines
3.4 KiB
C
140 lines
3.4 KiB
C
#include "magiskboot.h"
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static size_t restore(const char *filename, int fd) {
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int ifd = xopen(filename, O_RDONLY);
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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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xsendfile(fd, ifd, NULL, size);
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close(ifd);
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return size;
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}
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static void restore_buf(int fd, const void *buf, size_t size) {
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xwrite(fd, buf, size);
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}
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void repack(const char* orig_image, const char* out_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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// There are possible two MTK headers
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mtk_hdr mtk_kernel_hdr, mtk_ramdisk_hdr;
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size_t mtk_kernel_off, mtk_ramdisk_off;
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// Load original image
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mmap_ro(orig_image, &orig, &size);
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// Parse original image
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printf("Parsing boot image: [%s]\n\n", orig_image);
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parse_img(orig, size);
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printf("Repack to boot image: [%s]\n\n", out_image);
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// Create new image
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int fd = open_new(out_image);
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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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write_zero(fd, hdr.page_size);
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// Restore kernel
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if (mtk_kernel) {
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mtk_kernel_off = lseek(fd, 0, SEEK_CUR);
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restore_buf(fd, kernel, 512);
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memcpy(&mtk_kernel_hdr, kernel, sizeof(mtk_kernel_hdr));
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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, 1);
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// Restore ramdisk
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if (mtk_ramdisk) {
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mtk_ramdisk_off = lseek(fd, 0, SEEK_CUR);
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restore_buf(fd, ramdisk, 512);
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memcpy(&mtk_ramdisk_hdr, ramdisk, sizeof(mtk_ramdisk_hdr));
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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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// Before we start, clean up previous compressed files
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for (int i = 0; SUP_EXT_LIST[i]; ++i) {
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sprintf(name, "%s.%s", RAMDISK_FILE, SUP_EXT_LIST[i]);
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unlink(name);
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}
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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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LOGE(1, "Unsupported ramdisk format!\n");
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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; SUP_EXT_LIST[i]; ++i) {
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sprintf(name, "%s.%s", RAMDISK_FILE, SUP_EXT_LIST[i]);
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if (access(name, R_OK) == 0) {
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ramdisk_type = SUP_TYPE_LIST[i];
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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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LOGE(1, "No ramdisk exists!\n");
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hdr.ramdisk_size = restore(name, fd);
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file_align(fd, hdr.page_size, 1);
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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, 1);
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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, 1);
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}
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// Check extra info, currently only for LG Bump and Samsung SEANDROIDENFORCE
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if (extra) {
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if (memcmp(extra, "SEANDROIDENFORCE", 16) == 0 ||
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memcmp(extra, "\x41\xa9\xe4\x67\x74\x4d\x1d\x1b\xa4\x29\xf2\xec\xea\x65\x52\x79", 16) == 0 ) {
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restore_buf(fd, extra, 16);
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}
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}
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// Write headers back
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if (mtk_kernel) {
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lseek(fd, mtk_kernel_off, SEEK_SET);
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mtk_kernel_hdr.size = hdr.kernel_size;
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hdr.kernel_size += 512;
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restore_buf(fd, &mtk_kernel_hdr, sizeof(mtk_kernel_hdr));
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}
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if (mtk_ramdisk) {
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lseek(fd, mtk_ramdisk_off, SEEK_SET);
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mtk_ramdisk_hdr.size = hdr.ramdisk_size;
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hdr.ramdisk_size += 512;
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restore_buf(fd, &mtk_ramdisk_hdr, sizeof(mtk_ramdisk_hdr));
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}
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// Main header
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lseek(fd, 0, SEEK_SET);
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restore_buf(fd, &hdr, sizeof(hdr));
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// Print new image info
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print_info();
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munmap(orig, size);
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if (lseek(fd, 0, SEEK_END) > size) {
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LOGE(2, "Boot partition too small!\n");
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}
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close(fd);
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}
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