FFmpeg: libavformat/gopher.c Source File

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libavformat

gopher.c

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1 /*

2 * Gopher protocol

3 *

6 *

8 *

9 * This file is part of FFmpeg.

10 *

11 * FFmpeg is free software; you can redistribute it and/or

12 * modify it under the terms of the GNU Lesser General Public

13 * License as published by the Free Software Foundation; either

14 * version 2.1 of the License, or (at your option) any later version.

15 *

16 * FFmpeg is distributed in the hope that it will be useful,

17 * but WITHOUT ANY WARRANTY; without even the implied warranty of

18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU

19 * Lesser General Public License for more details.

20 *

21 * You should have received a copy of the GNU Lesser General Public

22 * License along with FFmpeg; if not, write to the Free Software

23 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

24 */

26 #include "config.h"

27 #include "config_components.h"

29 #include "libavutil/avstring.h"

30 #include "avformat.h"

31 #include "internal.h"

32 #include "network.h"

33 #include "url.h"

35 typedef struct GopherContext {

36 URLContext *hd;

37 } GopherContext;

39 static int gopher_write(URLContext *h, const uint8_t *buf, int size)

40 {

41 GopherContext *s = h->priv_data;

42 return ffurl_write(s->hd, buf, size);

43 }

45 static int gopher_connect(URLContext *h, const char *path)

46 {

47 char buffer[1024];

49 if (!*path) return AVERROR(EINVAL);

50 switch (*++path) {

51 case ';':

52 case '<':

53 case '5':

54 case '9':

55 case 's':

56 path = strchr(path, '/');

57 if (!path) return AVERROR(EINVAL);

58 break;

59 default:

60 av_log(h, AV_LOG_WARNING,

61 "Gopher protocol type '%c' not supported yet!\n",

62 *path);

63 return AVERROR(EINVAL);

64 }

66 /* send gopher sector */

67 snprintf(buffer, sizeof(buffer), "%s\r\n", path);

69 if (gopher_write(h, buffer, strlen(buffer)) < 0)

70 return AVERROR(EIO);

72 return 0;

73 }

75 static int gopher_close(URLContext *h)

76 {

77 GopherContext *s = h->priv_data;

78 ffurl_closep(&s->hd);

79 return 0;

80 }

82 static int gopher_open(URLContext *h, const char *uri, int flags)

83 {

84 GopherContext *s = h->priv_data;

85 char proto[10], hostname[1024], auth[1024], path[1024], buf[1024];

86 int port, err;

87 const char *lower_proto = "tcp";

89 h->is_streamed = 1;

91 /* needed in any case to build the host string */

92 av_url_split(proto, sizeof(proto), auth, sizeof(auth),

93 hostname, sizeof(hostname), &port, path, sizeof(path), uri);

95 if (port < 0)

96 port = 70;

98 if (!strcmp(proto, "gophers"))

99 lower_proto = "tls";

100

101 ff_url_join(buf, sizeof(buf), lower_proto, NULL, hostname, port, NULL);

102

103 s->hd = NULL;

104 err = ffurl_open_whitelist(&s->hd, buf, AVIO_FLAG_READ_WRITE,

105 &h->interrupt_callback, NULL, h->protocol_whitelist, h->protocol_blacklist, h);

106 if (err < 0)

107 goto fail;

108

109 if ((err = gopher_connect(h, path)) < 0)

110 goto fail;

111 return 0;

112 fail:

113 gopher_close(h);

114 return err;

115 }

116

117 static int gopher_read(URLContext *h, uint8_t *buf, int size)

118 {

119 GopherContext *s = h->priv_data;

120 int len = ffurl_read(s->hd, buf, size);

121 return len;

122 }

123

124 #if CONFIG_GOPHER_PROTOCOL

125 const URLProtocol ff_gopher_protocol = {

126 .name = "gopher",

127 .url_open = gopher_open,

128 .url_read = gopher_read,

129 .url_write = gopher_write,

130 .url_close = gopher_close,

131 .priv_data_size = sizeof(GopherContext),

132 .flags = URL_PROTOCOL_FLAG_NETWORK,

133 .default_whitelist = "gopher,tcp"

134 };

135 #endif /* CONFIG_GOPHER_PROTOCOL */

136

137 #if CONFIG_GOPHERS_PROTOCOL

138 const URLProtocol ff_gophers_protocol = {

139 .name = "gophers",

140 .url_open = gopher_open,

141 .url_read = gopher_read,

142 .url_write = gopher_write,

143 .url_close = gopher_close,

144 .priv_data_size = sizeof(GopherContext),

145 .flags = URL_PROTOCOL_FLAG_NETWORK,

146 .default_whitelist = "gopher,gophers,tcp,tls"

147 };

148 #endif /* CONFIG_GOPHERS_PROTOCOL */

AV_LOG_WARNING

#define AV_LOG_WARNING

Something somehow does not look correct.

Definition: log.h:186

AVERROR

Filter the word "frame" indicates either a video frame or a group of audio as stored in an AVFrame structure Format for each input and each output the list of supported formats For video that means pixel format For audio that means channel sample they are references to shared objects When the negotiation mechanism computes the intersection of the formats supported at each end of a all references to both lists are replaced with a reference to the intersection And when a single format is eventually chosen for a link amongst the remaining all references to the list are updated That means that if a filter requires that its input and output have the same format amongst a supported all it has to do is use a reference to the same list of formats query_formats can leave some formats unset and return AVERROR(EAGAIN) to cause the negotiation mechanism toagain later. That can be used by filters with complex requirements to use the format negotiated on one link to set the formats supported on another. Frame references ownership and permissions

URL_PROTOCOL_FLAG_NETWORK

#define URL_PROTOCOL_FLAG_NETWORK

Definition: url.h:33

AVIO_FLAG_READ_WRITE

#define AVIO_FLAG_READ_WRITE

read-write pseudo flag

Definition: avio.h:619

ffurl_write

static int ffurl_write(URLContext *h, const uint8_t *buf, int size)

Write size bytes from buf to the resource accessed by h.

Definition: url.h:202

GopherContext

Definition: gopher.c:35

gopher_open

static int gopher_open(URLContext *h, const char *uri, int flags)

Definition: gopher.c:82

URLProtocol

Definition: url.h:51

fail

#define fail()

Definition: checkasm.h:188

gopher_close

static int gopher_close(URLContext *h)

Definition: gopher.c:75

ffurl_open_whitelist

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:362

#define s(width, name)

Definition: cbs_vp9.c:198

ff_url_join

int ff_url_join(char *str, int size, const char *proto, const char *authorization, const char *hostname, int port, const char *fmt,...)

Definition: url.c:40

internal.h

NULL

#define NULL

Definition: coverity.c:32

gopher_write

static int gopher_write(URLContext *h, const uint8_t *buf, int size)

Definition: gopher.c:39

gopher_connect

static int gopher_connect(URLContext *h, const char *path)

Definition: gopher.c:45

size

int size

Definition: twinvq_data.h:10344

URLProtocol::name

const char * name

Definition: url.h:52

URLContext

Definition: url.h:35

av_url_split

void av_url_split(char *proto, int proto_size, char *authorization, int authorization_size, char *hostname, int hostname_size, int *port_ptr, char *path, int path_size, const char *url)

Split a URL string into components.

Definition: utils.c:351

url.h

len

int len

Definition: vorbis_enc_data.h:426

ff_gophers_protocol

const URLProtocol ff_gophers_protocol

ffurl_closep

int ffurl_closep(URLContext **hh)

Close the resource accessed by the URLContext h, and free the memory used by it.

Definition: avio.c:588

gopher_read

static int gopher_read(URLContext *h, uint8_t *buf, int size)

Definition: gopher.c:117

avformat.h

network.h

buffer

the frame and frame reference mechanism is intended to as much as expensive copies of that data while still allowing the filters to produce correct results The data is stored in buffers represented by AVFrame structures Several references can point to the same frame buffer

Definition: filter_design.txt:49

GopherContext::hd

URLContext * hd

Definition: gopher.c:36

flags

#define flags(name, subs,...)

Definition: cbs_av1.c:482

av_log

#define av_log(a,...)

Definition: tableprint_vlc.h:27

Definition: vp9dsp_template.c:2070

ff_gopher_protocol