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ffhash.c
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1 /*
2  * Copyright (c) 2002 Fabrice Bellard
3  * Copyright (c) 2013 Michael Niedermayer
4  * Copyright (c) 2013 James Almer
5  *
6  * This file is part of FFmpeg.
7  *
8  * FFmpeg is free software; you can redistribute it and/or
9  * modify it under the terms of the GNU Lesser General Public
10  * License as published by the Free Software Foundation; either
11  * version 2.1 of the License, or (at your option) any later version.
12  *
13  * FFmpeg is distributed in the hope that it will be useful,
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16  * Lesser General Public License for more details.
17  *
18  * You should have received a copy of the GNU Lesser General Public
19  * License along with FFmpeg; if not, write to the Free Software
20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21  */
22 
23 #include "config.h"
24 #include "libavutil/avstring.h"
25 #include "libavutil/error.h"
26 #include "libavutil/hash.h"
27 #include "libavutil/mem.h"
28 
29 #include <errno.h>
30 #include <fcntl.h>
31 #include <stdio.h>
32 #include <sys/stat.h>
33 
34 #if HAVE_IO_H
35 #include <io.h>
36 #endif
37 #if HAVE_UNISTD_H
38 #include <unistd.h>
39 #endif
40 
41 #define SIZE 65536
42 
43 static struct AVHashContext *hash;
44 static int out_b64;
45 
46 static void usage(void)
47 {
48  int i = 0;
49  const char *name;
50 
51  printf("usage: ffhash [b64:]algorithm [input]...\n");
52  printf("Supported hash algorithms:");
53  do {
54  name = av_hash_names(i);
55  if (name)
56  printf(" %s", name);
57  i++;
58  } while(name);
59  printf("\n");
60 }
61 
62 static void finish(void)
63 {
64  char res[2 * AV_HASH_MAX_SIZE + 4];
65 
66  printf("%s=", av_hash_get_name(hash));
67  if (out_b64) {
68  av_hash_final_b64(hash, res, sizeof(res));
69  printf("b64:%s", res);
70  } else {
71  av_hash_final_hex(hash, res, sizeof(res));
72  printf("0x%s", res);
73  }
74 }
75 
76 static int check(char *file)
77 {
79  int fd, flags = O_RDONLY;
80  int ret = 0;
81 
82 #ifdef O_BINARY
83  flags |= O_BINARY;
84 #endif
85  if (file) fd = open(file, flags);
86  else fd = 0;
87  if (fd == -1) {
88  printf("%s=OPEN-FAILED: %s:", av_hash_get_name(hash), strerror(errno));
89  ret = 1;
90  goto end;
91  }
92 
93  av_hash_init(hash);
94  for (;;) {
95  int size = read(fd, buffer, SIZE);
96  if (size < 0) {
97  close(fd);
98  finish();
99  printf("+READ-FAILED: %s", strerror(errno));
100  ret = 2;
101  goto end;
102  } else if(!size)
103  break;
104  av_hash_update(hash, buffer, size);
105  }
106  close(fd);
107 
108  finish();
109 end:
110  if (file)
111  printf(" *%s", file);
112  printf("\n");
113 
114  return ret;
115 }
116 
117 int main(int argc, char **argv)
118 {
119  int i;
120  int ret = 0;
121  const char *hash_name;
122 
123  if (argc == 1) {
124  usage();
125  return 0;
126  }
127 
128  hash_name = argv[1];
129  out_b64 = av_strstart(hash_name, "b64:", &hash_name);
130  if ((ret = av_hash_alloc(&hash, hash_name)) < 0) {
131  switch(ret) {
132  case AVERROR(EINVAL):
133  printf("Invalid hash type: %s\n", hash_name);
134  break;
135  case AVERROR(ENOMEM):
136  printf("%s\n", strerror(errno));
137  break;
138  }
139  return 1;
140  }
141 
142  for (i = 2; i < argc; i++)
143  ret |= check(argv[i]);
144 
145  if (argc < 3)
146  ret |= check(NULL);
147 
148  av_hash_freep(&hash);
149 
150  return ret;
151 }