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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  int err = errno;
98  close(fd);
99  finish();
100  printf("+READ-FAILED: %s", strerror(err));
101  ret = 2;
102  goto end;
103  } else if(!size)
104  break;
105  av_hash_update(hash, buffer, size);
106  }
107  close(fd);
108 
109  finish();
110 end:
111  if (file)
112  printf(" *%s", file);
113  printf("\n");
114 
115  return ret;
116 }
117 
118 int main(int argc, char **argv)
119 {
120  int i;
121  int ret = 0;
122  const char *hash_name;
123 
124  if (argc == 1) {
125  usage();
126  return 0;
127  }
128 
129  hash_name = argv[1];
130  out_b64 = av_strstart(hash_name, "b64:", &hash_name);
131  if ((ret = av_hash_alloc(&hash, hash_name)) < 0) {
132  switch(ret) {
133  case AVERROR(EINVAL):
134  printf("Invalid hash type: %s\n", hash_name);
135  break;
136  case AVERROR(ENOMEM):
137  printf("%s\n", strerror(errno));
138  break;
139  }
140  return 1;
141  }
142 
143  for (i = 2; i < argc; i++)
144  ret |= check(argv[i]);
145 
146  if (argc < 3)
147  ret |= check(NULL);
148 
149  av_hash_freep(&hash);
150 
151  return ret;
152 }
#define NULL
Definition: coverity.c:32
void av_hash_final_b64(struct AVHashContext *ctx, uint8_t *dst, int size)
Finalize a hash context and store the Base64 representation of the actual hash value as a string...
Definition: hash.c:225
#define SIZE
Definition: ffhash.c:41
Memory handling functions.
#define O_BINARY
static struct AVHashContext * hash
Definition: ffhash.c:43
#define AV_HASH_MAX_SIZE
Maximum value that av_hash_get_size() will currently return.
Definition: hash.h:157
static void usage(void)
Definition: ffhash.c:46
uint8_t
Generic hashing API.
static av_cold int end(AVCodecContext *avctx)
Definition: avrndec.c:90
static int check(char *file)
Definition: ffhash.c:76
static int out_b64
Definition: ffhash.c:44
ptrdiff_t size
Definition: opengl_enc.c:101
#define flags(name, subs,...)
Definition: cbs_h2645.c:263
int main(int argc, char **argv)
Definition: ffhash.c:118
void av_hash_init(AVHashContext *ctx)
Initialize or reset a hash context.
Definition: hash.c:137
error code definitions
#define AVERROR(e)
Definition: error.h:43
int av_hash_alloc(AVHashContext **ctx, const char *name)
Allocate a hash context for the algorithm specified by name.
Definition: hash.c:100
const char * av_hash_names(int i)
Get the names of available hash algorithms.
Definition: hash.c:84
const char * av_hash_get_name(const AVHashContext *ctx)
Definition: hash.c:90
void av_hash_update(AVHashContext *ctx, const uint8_t *src, int len)
Update a hash context with additional data.
Definition: hash.c:159
void av_hash_freep(AVHashContext **ctx)
Free hash context and set hash context pointer to NULL.
Definition: hash.c:238
void av_hash_final_hex(struct AVHashContext *ctx, uint8_t *dst, int size)
Finalize a hash context and store the hexadecimal representation of the actual hash value as a string...
Definition: hash.c:215
int av_strstart(const char *str, const char *pfx, const char **ptr)
Return non-zero if pfx is a prefix of str.
Definition: avstring.c:34
static void finish(void)
Definition: ffhash.c:62
GLuint buffer
Definition: opengl_enc.c:102
const char * name
Definition: opengl_enc.c:103