/*
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* Copyright (C) 2016 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include "libfdt.h"
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#include "libufdt_sysdeps.h"
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#include "util.h"
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int find_dtb_header_pos(const char *buf, size_t buf_size) {
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if (buf == NULL || buf_size == 0) {
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return -1;
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}
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int pos = buf_size;
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while (1) {
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pos--;
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if (pos < 0) {
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break;
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}
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uint32_t tag = fdt32_to_cpu(*(fdt32_t *)(buf + pos));
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if (tag == FDT_MAGIC) {
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// Hit!
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break;
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}
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}
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return pos;
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}
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int find_and_write_dtb(const char *filename,
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const char *buf, size_t buf_size) {
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int tag_pos = find_dtb_header_pos(buf, buf_size);
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if (tag_pos < 0) {
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goto end;
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}
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// Check FDT header
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const char *fdt_ptr = buf + tag_pos;
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if (fdt_check_header(fdt_ptr) != 0) {
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fprintf(stderr, "Bad DTB header.\n");
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goto end;
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}
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// Check FDT size and actual size
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size_t fdt_size = fdt_totalsize(fdt_ptr);
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size_t fdt_actual_size = buf_size - tag_pos;
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int fdt_size_diff = (int)fdt_actual_size - (int)fdt_size;
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if (fdt_size_diff) {
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fprintf(stderr, "Wrong size: actual size = %d FDT size = %d(%d)\n",
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fdt_actual_size, fdt_size, fdt_size_diff);
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}
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// Print the DT basic information
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int root_node_off = fdt_path_offset(fdt_ptr, "/");
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if (root_node_off < 0) {
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fprintf(stderr, "Can not get the root node.\n");
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goto end;
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}
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printf("Output %s\n", filename);
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const char *model =
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(const char *)fdt_getprop(fdt_ptr, root_node_off, "model", NULL);
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printf(" model=%s\n", model ? model : "(unknown)");
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const char *compatible =
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(const char *)fdt_getprop(fdt_ptr, root_node_off, "compatible", NULL);
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printf(" compatible=%s\n", compatible ? compatible : "(unknown)");
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// Output DTB file
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if (write_fdt_to_file(filename, fdt_ptr) != 0) {
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fprintf(stderr, "Write file error: %s\n", filename);
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goto end;
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}
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end:
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return tag_pos;
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}
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int extract_dtbs(const char *in_filename,
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const char *out_dtb_filename,
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const char *out_image_filename) {
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int ret = 1;
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char *buf = NULL;
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size_t buf_size;
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buf = load_file(in_filename, &buf_size);
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if (!buf) {
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fprintf(stderr, "Can not load file: %s\n", in_filename);
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goto end;
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}
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char filename[128];
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int index = 0;
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while (buf_size > 0) {
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int tag_pos;
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if (index > 0) {
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snprintf(filename, sizeof(filename), "%s.%d", out_dtb_filename, index);
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tag_pos = find_and_write_dtb(filename, buf, buf_size);
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} else {
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tag_pos = find_and_write_dtb(out_dtb_filename, buf, buf_size);
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}
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if (tag_pos < 0) {
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break;
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}
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buf_size = tag_pos;
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index++;
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}
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if (index == 0) {
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fprintf(stderr, "Can not find any DTB.\n");
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goto end;
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}
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// Output the rest buffer as image file
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if (out_image_filename != NULL) {
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printf("Output %s\n", out_image_filename);
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if (write_buf_to_file(out_image_filename, buf, buf_size) != 0) {
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fprintf(stderr, "Write file error: %s\n", out_image_filename);
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goto end;
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}
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}
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ret = 0;
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end:
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if (buf) dto_free(buf);
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return ret;
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}
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int main(int argc, char **argv) {
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if (argc < 3) {
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fprintf(stderr, "Usage: %s <image.gz-dtb_file> <out_dtb_name> (<out_image_name>)\n\n", argv[0]);
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fprintf(stderr, " Note: If there are more than one DTB, it outputs DTB files named\n" \
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" out_dtb_name, out_dtb_name.1, out_dtb_name.2, etc.\n");
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return 1;
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}
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const char *in_file = argv[1];
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const char *out_dtb_file = argv[2];
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const char *out_image_file = (argc > 3) ? argv[3] : NULL;
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int ret = extract_dtbs(in_file, out_dtb_file, out_image_file);
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return ret;
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}
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