ffmpeg/tools/ffhash.c

   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 {
  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             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 }