forked from MarcoBuster/Magisk
80 lines
1.8 KiB
C
80 lines
1.8 KiB
C
#include "magiskboot.h"
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static void dump(unsigned char *buf, size_t size, const char *filename) {
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int ofd = open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0644);
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if (ofd < 0)
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error(1, "Cannot open %s", filename);
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if (write(ofd, buf, size) != size)
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error(1, "Cannot dump %s", filename);
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close(ofd);
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}
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void unpack(const char* image) {
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int fd = open(image, O_RDONLY);
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if (fd < 0)
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error(1, "Cannot open %s", image);
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size_t size = lseek(fd, 0, SEEK_END);
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lseek(fd, 0, SEEK_SET);
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unsigned char *orig = mmap(NULL, size, PROT_READ, MAP_SHARED, fd, 0);
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// Parse image
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parse_img(orig, size);
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if (boot_type == CHROMEOS) {
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// The caller should know it's chromeos, as it needs additional signing
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dump(base, 0, "chromeos");
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}
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char name[PATH_MAX];
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// Dump kernel
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if (mtk_kernel) {
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kernel += 512;
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hdr.kernel_size -= 512;
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}
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dump(kernel, hdr.kernel_size, KERNEL_FILE);
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// Dump ramdisk
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if (mtk_ramdisk) {
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ramdisk += 512;
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hdr.ramdisk_size -= 512;
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}
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if (decomp(ramdisk_type, RAMDISK_FILE, ramdisk, hdr.ramdisk_size)) {
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printf("Unsupported format! Please decompress manually!\n");
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switch (ramdisk_type) {
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case LZOP:
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sprintf(name, "%s.%s", RAMDISK_FILE, "lzo");
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break;
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default:
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// Never happens
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break;
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}
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// Dump the compressed ramdisk
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dump(ramdisk, hdr.ramdisk_size, name);
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}
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if (hdr.second_size) {
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// Dump second
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dump(second, hdr.second_size, SECOND_FILE);
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}
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if (hdr.dt_size) {
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if (boot_type == ELF && (dtb_type != QCDT && dtb_type != ELF)) {
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printf("Non QC dtb found in ELF kernel, recreate kernel\n");
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gzip(1, KERNEL_FILE, kernel, hdr.kernel_size);
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int kfp = open(KERNEL_FILE, O_WRONLY | O_APPEND);
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write(kfp, dtb, hdr.dt_size);
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close(kfp);
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} else {
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// Dump dtb
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dump(dtb, hdr.dt_size, DTB_FILE);
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}
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}
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munmap(orig, size);
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close(fd);
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}
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