1 /*
2  * Copyright (C) 2016 The Android Open Source Project
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  *      http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 
17 #include <stdio.h>
18 #include <stdlib.h>
19 #include <time.h>
20 
21 #include "ufdt_overlay.h"
22 #include "libufdt_sysdeps.h"
23 
24 #include "util.h"
25 
26 int apply_overlay_files(const char *out_filename, const char *base_filename,
27                         const char *overlay_filename) {
28   int ret = 1;
29   char *base_buf = NULL;
30   char *overlay_buf = NULL;
31   struct fdt_header *new_blob = NULL;
32 
33   size_t blob_len;
34   base_buf = load_file(base_filename, &blob_len);
35   if (!base_buf) {
36     fprintf(stderr, "Can not load base file: %s\n", base_filename);
37     goto end;
38   }
39 
40   size_t overlay_len;
41   overlay_buf = load_file(overlay_filename, &overlay_len);
42   if (!overlay_buf) {
43     fprintf(stderr, "Can not load overlay file: %s\n", overlay_filename);
44     goto end;
45   }
46 
47   struct fdt_header *blob = ufdt_install_blob(base_buf, blob_len);
48   if (!blob) {
49     fprintf(stderr, "ufdt_install_blob() returns null\n");
50     goto end;
51   }
52 
53   clock_t start = clock();
54   new_blob = ufdt_apply_overlay(blob, blob_len, overlay_buf, overlay_len);
55   clock_t end = clock();
56 
57   if (write_fdt_to_file(out_filename, new_blob) != 0) {
58     fprintf(stderr, "Write file error: %s\n", out_filename);
59     goto end;
60   }
61 
62   // Outputs the used time.
63   double cpu_time_used = ((double)(end - start)) / CLOCKS_PER_SEC;
64   printf("ufdt_apply_overlay: took %.9f secs\n", cpu_time_used);
65   ret = 0;
66 
67 end:
68   // Do not dto_free(blob) - it's the same as base_buf.
69 
70   if (new_blob) dto_free(new_blob);
71   if (overlay_buf) dto_free(overlay_buf);
72   if (base_buf) dto_free(base_buf);
73 
74   return ret;
75 }
76 
77 int main(int argc, char **argv) {
78   if (argc < 4) {
79     fprintf(stderr, "Usage: %s <base_file> <overlay_file> <out_file>\n", argv[0]);
80     return 1;
81   }
82 
83   const char *base_file = argv[1];
84   const char *overlay_file = argv[2];
85   const char *out_file = argv[3];
86   int ret = apply_overlay_files(out_file, base_file, overlay_file);
87 
88   return ret;
89 }
90