FFmpeg: libavformat/md5proto.c Source File

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libavformat

md5proto.c

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1 /*

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 */

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"

30 struct MD5Context {

31 struct AVMD5 *md5;

32 };

34 static int md5_open(URLContext *h, const char *filename, int flags)

35 {

36 struct MD5Context *c = h->priv_data;

38 if (!(flags & AVIO_FLAG_WRITE))

39 return AVERROR(EINVAL);

41 c->md5 = av_md5_alloc();

42 if (!c->md5)

43 return AVERROR(ENOMEM);

44 av_md5_init(c->md5);

46 return 0;

47 }

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 }

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;

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';

69 av_strstart(filename, "md5:", &filename);

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 }

83 av_freep(&c->md5);

85 return err;

86 }

89 URLProtocol 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 };

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