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md5proto.c
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1 /*
2  * Copyright (c) 2010 Mans Rullgard
3  *
4  * This file is part of FFmpeg.
5  *
6  * FFmpeg is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU Lesser General Public
8  * License as published by the Free Software Foundation; either
9  * version 2.1 of the License, or (at your option) any later version.
10  *
11  * FFmpeg is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14  * Lesser General Public License for more details.
15  *
16  * You should have received a copy of the GNU Lesser General Public
17  * License along with FFmpeg; if not, write to the Free Software
18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19  */
20 
21 #include <stdio.h>
22 #include "libavutil/avstring.h"
23 #include "libavutil/md5.h"
24 #include "libavutil/mem.h"
25 #include "libavutil/error.h"
26 #include "avformat.h"
27 #include "avio.h"
28 #include "url.h"
29 
30 struct MD5Context {
31  struct AVMD5 *md5;
32 };
33 
34 static int md5_open(URLContext *h, const char *filename, int flags)
35 {
36  struct MD5Context *c = h->priv_data;
37 
38  if (!(flags & AVIO_FLAG_WRITE))
39  return AVERROR(EINVAL);
40 
41  c->md5 = av_md5_alloc();
42  if (!c->md5)
43  return AVERROR(ENOMEM);
44  av_md5_init(c->md5);
45 
46  return 0;
47 }
48 
49 static int md5_write(URLContext *h, const unsigned char *buf, int size)
50 {
51  struct MD5Context *c = h->priv_data;
52  av_md5_update(c->md5, buf, size);
53  return size;
54 }
55 
56 static int md5_close(URLContext *h)
57 {
58  struct MD5Context *c = h->priv_data;
59  const char *filename = h->filename;
60  uint8_t md5[16], buf[64];
61  URLContext *out;
62  int i, err = 0;
63 
64  av_md5_final(c->md5, md5);
65  for (i = 0; i < sizeof(md5); i++)
66  snprintf(buf + i*2, 3, "%02x", md5[i]);
67  buf[i*2] = '\n';
68 
69  av_strstart(filename, "md5:", &filename);
70 
71  if (*filename) {
72  err = ffurl_open(&out, filename, AVIO_FLAG_WRITE,
73  &h->interrupt_callback, NULL);
74  if (err)
75  return err;
76  err = ffurl_write(out, buf, i*2+1);
77  ffurl_close(out);
78  } else {
79  if (fwrite(buf, 1, i*2+1, stdout) < i*2+1)
80  err = AVERROR(errno);
81  }
82 
83  av_freep(&c->md5);
84 
85  return err;
86 }
87 
88 
90  .name = "md5",
91  .url_open = md5_open,
92  .url_write = md5_write,
93  .url_close = md5_close,
94  .priv_data_size = sizeof(struct MD5Context),
95 };