magiskboot: add support for lz4 compressed dt (extra)
- legacy devices brought up to Android 10 may now use a compressed dt in a hdr_v0 AOSP dt variant extra section, so detect, decompress and recompress this - so far these have only been done using lz4 compression (latest format revision magic), e.g. LOS 17.1 victara (Moto X)
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@ -255,6 +255,7 @@ void boot_img::parse_image(uint8_t *addr) {
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k_fmt = check_fmt(kernel, hdr->kernel_size());
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k_fmt = check_fmt(kernel, hdr->kernel_size());
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r_fmt = check_fmt(ramdisk, hdr->ramdisk_size());
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r_fmt = check_fmt(ramdisk, hdr->ramdisk_size());
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e_fmt = check_fmt(extra, hdr->extra_size());
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// Check MTK
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// Check MTK
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if (k_fmt == MTK) {
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if (k_fmt == MTK) {
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@ -280,6 +281,7 @@ void boot_img::parse_image(uint8_t *addr) {
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fprintf(stderr, "KERNEL_FMT [%s]\n", fmt2name[k_fmt]);
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fprintf(stderr, "KERNEL_FMT [%s]\n", fmt2name[k_fmt]);
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fprintf(stderr, "RAMDISK_FMT [%s]\n", fmt2name[r_fmt]);
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fprintf(stderr, "RAMDISK_FMT [%s]\n", fmt2name[r_fmt]);
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fprintf(stderr, "EXTRA_FMT [%s]\n", fmt2name[e_fmt]);
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}
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}
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static int find_dtb_offset(uint8_t *buf, int sz) {
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static int find_dtb_offset(uint8_t *buf, int sz) {
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@ -371,7 +373,13 @@ int unpack(const char *image, bool nodecomp, bool hdr) {
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dump(boot.second, boot.hdr->second_size(), SECOND_FILE);
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dump(boot.second, boot.hdr->second_size(), SECOND_FILE);
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// Dump extra
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// Dump extra
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dump(boot.extra, boot.hdr->extra_size(), EXTRA_FILE);
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if (!nodecomp && COMPRESSED(boot.e_fmt)) {
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int fd = creat(EXTRA_FILE, 0644);
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decompress(boot.e_fmt, fd, boot.extra, boot.hdr->extra_size());
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close(fd);
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} else {
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dump(boot.extra, boot.hdr->extra_size(), EXTRA_FILE);
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}
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// Dump recovery_dtbo
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// Dump recovery_dtbo
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dump(boot.recovery_dtbo, boot.hdr->recovery_dtbo_size(), RECV_DTBO_FILE);
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dump(boot.recovery_dtbo, boot.hdr->recovery_dtbo_size(), RECV_DTBO_FILE);
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@ -483,7 +491,15 @@ void repack(const char* src_img, const char* out_img, bool nocomp) {
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// extra
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// extra
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off.extra = lseek(fd, 0, SEEK_CUR);
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off.extra = lseek(fd, 0, SEEK_CUR);
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if (access(EXTRA_FILE, R_OK) == 0) {
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if (access(EXTRA_FILE, R_OK) == 0) {
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boot.hdr->extra_size() = restore(fd, EXTRA_FILE);
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size_t raw_size;
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void *raw_buf;
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mmap_ro(EXTRA_FILE, raw_buf, raw_size);
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if (!nocomp && !COMPRESSED_ANY(check_fmt(raw_buf, raw_size)) && COMPRESSED(boot.e_fmt)) {
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boot.hdr->extra_size() = compress(boot.e_fmt, fd, raw_buf, raw_size);
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} else {
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boot.hdr->extra_size() = xwrite(fd, raw_buf, raw_size);
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}
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munmap(raw_buf, raw_size);
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file_align();
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file_align();
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}
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}
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@ -303,9 +303,10 @@ struct boot_img {
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// Flags to indicate the state of current boot image
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// Flags to indicate the state of current boot image
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uint16_t flags = 0;
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uint16_t flags = 0;
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// The format of kernel and ramdisk
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// The format of kernel, ramdisk and extra
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format_t k_fmt;
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format_t k_fmt;
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format_t r_fmt;
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format_t r_fmt;
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format_t e_fmt;
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/***************************************************
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/***************************************************
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* Following pointers points within the mmap region
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* Following pointers points within the mmap region
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