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
30struct MD5Context {
31    struct AVMD5 *md5;
32};
33
34static 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
49static 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
56static 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
89URLProtocol ff_md5_protocol = {
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};
96