xref: /third_party/ffmpeg/tools/ffhash.c (revision cabdff1a) 
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
28#include <errno.h>
29#include <fcntl.h>
30#include <stdio.h>
31#include <string.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
43static struct AVHashContext *hash;
44static int out_b64;
45
46static 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
62static 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
76static int check(char *file)
77{
78    uint8_t buffer[SIZE];
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();
110end:
111    if (file)
112        printf(" *%s", file);
113    printf("\n");
114
115    return ret;
116}
117
118int 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}
153