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 "util.h"
18
19#include <stdio.h>
20#include <stdlib.h>
21
22#include "libfdt.h"
23#include "libufdt_sysdeps.h"
24
25static char *load_file_contents(FILE *fp, size_t *len_ptr) {
26  // Gets the file size.
27  fseek(fp, 0, SEEK_END);
28  size_t len = ftell(fp);
29  fseek(fp, 0, SEEK_SET);
30
31  char *buf = malloc(len);
32  if (buf == NULL) {
33    return NULL;
34  }
35
36  if (fread(buf, len, 1, fp) != 1) {
37    free(buf);
38    return NULL;
39  }
40
41  if (len_ptr) {
42    *len_ptr = len;
43  }
44
45  return buf;
46}
47
48char *load_file(const char *filename, size_t *len_ptr) {
49  FILE *fp = fopen(filename, "r");
50  if (!fp) {
51    return NULL;
52  }
53
54  char *buf = load_file_contents(fp, len_ptr);
55
56  fclose(fp);
57
58  return buf;
59}
60
61int write_buf_to_file(const char *filename,
62                      const void *buf, size_t buf_size) {
63  int ret = 0;
64  FILE *fout = NULL;
65
66  fout = fopen(filename, "wb");
67  if (!fout) {
68    ret = 1;
69    goto end;
70  }
71  if (fwrite(buf, 1, buf_size, fout) < 1) {
72    ret = 2;
73    goto end;
74  }
75
76end:
77  if (fout) fclose(fout);
78
79  return ret;
80}
81
82int write_fdt_to_file(const char *filename, const void *fdt) {
83  return write_buf_to_file(filename, fdt, fdt_totalsize(fdt));
84}
85