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
md5_open(URLContext * h,const char * filename,int flags)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
md5_write(URLContext * h,const unsigned char * buf,int size)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
md5_close(URLContext * h)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_whitelist(&out, filename, AVIO_FLAG_WRITE,
73 &h->interrupt_callback, NULL,
74 h->protocol_whitelist, h->protocol_blacklist, h);
75 if (err)
76 return err;
77 err = ffurl_write(out, buf, i*2+1);
78 ffurl_close(out);
79 } else {
80 if (fwrite(buf, 1, i*2+1, stdout) < i*2+1)
81 err = AVERROR(errno);
82 }
83
84 av_freep(&c->md5);
85
86 return err;
87 }
88
89
90 const URLProtocol ff_md5_protocol = {
91 .name = "md5",
92 .url_open = md5_open,
93 .url_write = md5_write,
94 .url_close = md5_close,
95 .priv_data_size = sizeof(struct MD5Context),
96 };
97