FFmpeg
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:100
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
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:259
error code definitions
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
#define flags(name, subs,...)
Definition: cbs_av1.c:561
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
printf("static const uint8_t my_array[100] = {\n")
Filter the word “frame” indicates either a video frame or a group of audio as stored in an AVFrame structure Format for each input and each output the list of supported formats For video that means pixel format For audio that means channel sample they are references to shared objects When the negotiation mechanism computes the intersection of the formats supported at each end of a all references to both lists are replaced with a reference to the intersection And when a single format is eventually chosen for a link amongst the remaining all references to the list are updated That means that if a filter requires that its input and output have the same format amongst a supported all it has to do is use a reference to the same list of formats query_formats can leave some formats unset and return AVERROR(EAGAIN) to cause the negotiation mechanism toagain later.That can be used by filters with complex requirements to use the format negotiated on one link to set the formats supported on another.Frame references ownership and permissions
GLuint buffer
Definition: opengl_enc.c:101
const char * name
Definition: opengl_enc.c:102