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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_whitelist(&out, filename, AVIO_FLAG_WRITE,
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 
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 };
#define NULL
Definition: coverity.c:32
struct AVMD5 * md5
Definition: md5proto.c:31
Buffered I/O operations.
int ffurl_open_whitelist(URLContext **puc, const char *filename, int flags, const AVIOInterruptCB *int_cb, AVDictionary **options, const char *whitelist, const char *blacklist, URLContext *parent)
Create an URLContext for accessing to the resource indicated by url, and open it. ...
Definition: avio.c:309
memory handling functions
int ffurl_write(URLContext *h, const unsigned char *buf, int size)
Write size bytes from buf to the resource accessed by h.
Definition: avio.c:421
AVIOInterruptCB interrupt_callback
Definition: url.h:47
#define AVIO_FLAG_WRITE
write-only
Definition: avio.h:543
void av_md5_update(AVMD5 *ctx, const uint8_t *src, int len)
Update hash value.
Definition: md5.c:157
struct AVMD5 * av_md5_alloc(void)
Allocate an AVMD5 context.
Definition: md5.c:48
uint8_t
ptrdiff_t size
Definition: opengl_enc.c:101
Definition: md5.c:40
const URLProtocol ff_md5_protocol
Definition: md5proto.c:90
static int md5_write(URLContext *h, const unsigned char *buf, int size)
Definition: md5proto.c:49
error code definitions
const char * protocol_whitelist
Definition: url.h:49
#define AVERROR(e)
Definition: error.h:43
FILE * out
Definition: movenc-test.c:54
static int md5_open(URLContext *h, const char *filename, int flags)
Definition: md5proto.c:34
const char * protocol_blacklist
Definition: url.h:50
void av_md5_init(AVMD5 *ctx)
Initialize MD5 hashing.
Definition: md5.c:147
void * buf
Definition: avisynth_c.h:553
Definition: url.h:38
void * priv_data
Definition: url.h:41
static int md5_close(URLContext *h)
Definition: md5proto.c:56
#define snprintf
Definition: snprintf.h:34
void av_md5_final(AVMD5 *ctx, uint8_t *dst)
Finish hashing and output digest value.
Definition: md5.c:192
const char * name
Definition: url.h:54
static int flags
Definition: cpu.c:47
int ffurl_close(URLContext *h)
Definition: avio.c:467
int av_strstart(const char *str, const char *pfx, const char **ptr)
Return non-zero if pfx is a prefix of str.
Definition: avstring.c:34
Main libavformat public API header.
static double c[64]
char * filename
specified URL
Definition: url.h:42
struct AVMD5 * md5
Definition: movenc-test.c:56
#define av_freep(p)
unbuffered private I/O API