Remove a pointless cast.
[libav.git] / libavformat / http.c
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1/*
2 * HTTP protocol for ffmpeg client
3 * Copyright (c) 2000, 2001 Fabrice Bellard.
4 *
5 * This file is part of FFmpeg.
6 *
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
11 *
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21#include "avformat.h"
22#include <unistd.h>
23#include "network.h"
a5e979f4 24#include "os_support.h"
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25
26#include "base64.h"
75e61b0e 27#include "avstring.h"
558b86a5 28
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29/* XXX: POST protocol is not completely implemented because ffmpeg uses
30 only a subset of it. */
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31
32//#define DEBUG
33
34/* used for protocol handling */
35#define BUFFER_SIZE 1024
36#define URL_SIZE 4096
37#define MAX_REDIRECTS 8
38
39typedef struct {
40 URLContext *hd;
41 unsigned char buffer[BUFFER_SIZE], *buf_ptr, *buf_end;
42 int line_count;
43 int http_code;
44 offset_t off, filesize;
45 char location[URL_SIZE];
46} HTTPContext;
47
48static int http_connect(URLContext *h, const char *path, const char *hoststr,
49 const char *auth, int *new_location);
50static int http_write(URLContext *h, uint8_t *buf, int size);
51
52
53/* return non zero if error */
54static int http_open_cnx(URLContext *h)
55{
56 const char *path, *proxy_path;
57 char hostname[1024], hoststr[1024];
58 char auth[1024];
59 char path1[1024];
60 char buf[1024];
61 int port, use_proxy, err, location_changed = 0, redirects = 0;
62 HTTPContext *s = h->priv_data;
63 URLContext *hd = NULL;
64
65 proxy_path = getenv("http_proxy");
66 use_proxy = (proxy_path != NULL) && !getenv("no_proxy") &&
f7d78f36 67 av_strstart(proxy_path, "http://", NULL);
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68
69 /* fill the dest addr */
70 redo:
71 /* needed in any case to build the host string */
72 url_split(NULL, 0, auth, sizeof(auth), hostname, sizeof(hostname), &port,
73 path1, sizeof(path1), s->location);
74 if (port > 0) {
75 snprintf(hoststr, sizeof(hoststr), "%s:%d", hostname, port);
76 } else {
75e61b0e 77 av_strlcpy(hoststr, hostname, sizeof(hoststr));
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78 }
79
80 if (use_proxy) {
81 url_split(NULL, 0, auth, sizeof(auth), hostname, sizeof(hostname), &port,
82 NULL, 0, proxy_path);
83 path = s->location;
84 } else {
85 if (path1[0] == '\0')
86 path = "/";
87 else
88 path = path1;
89 }
90 if (port < 0)
91 port = 80;
92
93 snprintf(buf, sizeof(buf), "tcp://%s:%d", hostname, port);
94 err = url_open(&hd, buf, URL_RDWR);
95 if (err < 0)
96 goto fail;
97
98 s->hd = hd;
99 if (http_connect(h, path, hoststr, auth, &location_changed) < 0)
100 goto fail;
a3fd2bd8 101 if ((s->http_code == 302 || s->http_code == 303) && location_changed == 1) {
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102 /* url moved, get next */
103 url_close(hd);
104 if (redirects++ >= MAX_REDIRECTS)
6f3e0b21 105 return AVERROR(EIO);
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106 location_changed = 0;
107 goto redo;
108 }
109 return 0;
110 fail:
111 if (hd)
112 url_close(hd);
6f3e0b21 113 return AVERROR(EIO);
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114}
115
116static int http_open(URLContext *h, const char *uri, int flags)
117{
118 HTTPContext *s;
119 int ret;
120
121 h->is_streamed = 1;
122
123 s = av_malloc(sizeof(HTTPContext));
124 if (!s) {
125 return AVERROR(ENOMEM);
126 }
127 h->priv_data = s;
128 s->filesize = -1;
129 s->off = 0;
f7d78f36 130 av_strlcpy(s->location, uri, URL_SIZE);
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131
132 ret = http_open_cnx(h);
133 if (ret != 0)
134 av_free (s);
135 return ret;
136}
137static int http_getc(HTTPContext *s)
138{
139 int len;
140 if (s->buf_ptr >= s->buf_end) {
141 len = url_read(s->hd, s->buffer, BUFFER_SIZE);
142 if (len < 0) {
6f3e0b21 143 return AVERROR(EIO);
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144 } else if (len == 0) {
145 return -1;
146 } else {
147 s->buf_ptr = s->buffer;
148 s->buf_end = s->buffer + len;
149 }
150 }
151 return *s->buf_ptr++;
152}
153
154static int process_line(URLContext *h, char *line, int line_count,
155 int *new_location)
156{
157 HTTPContext *s = h->priv_data;
158 char *tag, *p;
159
160 /* end of header */
161 if (line[0] == '\0')
162 return 0;
163
164 p = line;
165 if (line_count == 0) {
166 while (!isspace(*p) && *p != '\0')
167 p++;
168 while (isspace(*p))
169 p++;
170 s->http_code = strtol(p, NULL, 10);
171#ifdef DEBUG
172 printf("http_code=%d\n", s->http_code);
173#endif
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174 /* error codes are 4xx and 5xx */
175 if (s->http_code >= 400 && s->http_code < 600)
176 return -1;
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177 } else {
178 while (*p != '\0' && *p != ':')
179 p++;
180 if (*p != ':')
181 return 1;
182
183 *p = '\0';
184 tag = line;
185 p++;
186 while (isspace(*p))
187 p++;
188 if (!strcmp(tag, "Location")) {
189 strcpy(s->location, p);
190 *new_location = 1;
191 } else if (!strcmp (tag, "Content-Length") && s->filesize == -1) {
192 s->filesize = atoll(p);
193 } else if (!strcmp (tag, "Content-Range")) {
194 /* "bytes $from-$to/$document_size" */
195 const char *slash;
196 if (!strncmp (p, "bytes ", 6)) {
197 p += 6;
198 s->off = atoll(p);
199 if ((slash = strchr(p, '/')) && strlen(slash) > 0)
200 s->filesize = atoll(slash+1);
201 }
202 h->is_streamed = 0; /* we _can_ in fact seek */
203 }
204 }
205 return 1;
206}
207
208static int http_connect(URLContext *h, const char *path, const char *hoststr,
209 const char *auth, int *new_location)
210{
211 HTTPContext *s = h->priv_data;
212 int post, err, ch;
213 char line[1024], *q;
214 char *auth_b64;
bd03c380 215 int auth_b64_len = strlen(auth)* 4 / 3 + 12;
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216 offset_t off = s->off;
217
218
219 /* send http header */
220 post = h->flags & URL_WRONLY;
bd03c380 221 auth_b64 = av_malloc(auth_b64_len);
2907abed 222 av_base64_encode(auth_b64, auth_b64_len, auth, strlen(auth));
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223 snprintf(s->buffer, sizeof(s->buffer),
224 "%s %s HTTP/1.1\r\n"
225 "User-Agent: %s\r\n"
226 "Accept: */*\r\n"
227 "Range: bytes=%"PRId64"-\r\n"
228 "Host: %s\r\n"
229 "Authorization: Basic %s\r\n"
167c5531 230 "Connection: close\r\n"
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231 "\r\n",
232 post ? "POST" : "GET",
233 path,
234 LIBAVFORMAT_IDENT,
235 s->off,
236 hoststr,
237 auth_b64);
238
239 av_freep(&auth_b64);
240 if (http_write(h, s->buffer, strlen(s->buffer)) < 0)
6f3e0b21 241 return AVERROR(EIO);
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242
243 /* init input buffer */
244 s->buf_ptr = s->buffer;
245 s->buf_end = s->buffer;
246 s->line_count = 0;
247 s->off = 0;
ecb4a895 248 s->filesize = -1;
558b86a5 249 if (post) {
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250 return 0;
251 }
252
253 /* wait for header */
254 q = line;
255 for(;;) {
256 ch = http_getc(s);
257 if (ch < 0)
6f3e0b21 258 return AVERROR(EIO);
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259 if (ch == '\n') {
260 /* process line */
261 if (q > line && q[-1] == '\r')
262 q--;
263 *q = '\0';
264#ifdef DEBUG
265 printf("header='%s'\n", line);
266#endif
267 err = process_line(h, line, s->line_count, new_location);
268 if (err < 0)
269 return err;
270 if (err == 0)
271 break;
272 s->line_count++;
273 q = line;
274 } else {
275 if ((q - line) < sizeof(line) - 1)
276 *q++ = ch;
277 }
278 }
279
280 return (off == s->off) ? 0 : -1;
281}
282
283
284static int http_read(URLContext *h, uint8_t *buf, int size)
285{
286 HTTPContext *s = h->priv_data;
287 int len;
288
289 /* read bytes from input buffer first */
290 len = s->buf_end - s->buf_ptr;
291 if (len > 0) {
292 if (len > size)
293 len = size;
294 memcpy(buf, s->buf_ptr, len);
295 s->buf_ptr += len;
296 } else {
297 len = url_read(s->hd, buf, size);
298 }
299 if (len > 0)
300 s->off += len;
301 return len;
302}
303
304/* used only when posting data */
305static int http_write(URLContext *h, uint8_t *buf, int size)
306{
307 HTTPContext *s = h->priv_data;
308 return url_write(s->hd, buf, size);
309}
310
311static int http_close(URLContext *h)
312{
313 HTTPContext *s = h->priv_data;
314 url_close(s->hd);
315 av_free(s);
316 return 0;
317}
318
319static offset_t http_seek(URLContext *h, offset_t off, int whence)
320{
321 HTTPContext *s = h->priv_data;
322 URLContext *old_hd = s->hd;
323 offset_t old_off = s->off;
324
325 if (whence == AVSEEK_SIZE)
326 return s->filesize;
327 else if ((s->filesize == -1 && whence == SEEK_END) || h->is_streamed)
328 return -1;
329
330 /* we save the old context in case the seek fails */
331 s->hd = NULL;
332 if (whence == SEEK_CUR)
333 off += s->off;
334 else if (whence == SEEK_END)
335 off += s->filesize;
336 s->off = off;
337
338 /* if it fails, continue on old connection */
339 if (http_open_cnx(h) < 0) {
340 s->hd = old_hd;
341 s->off = old_off;
342 return -1;
343 }
344 url_close(old_hd);
345 return off;
346}
347
348URLProtocol http_protocol = {
349 "http",
350 http_open,
351 http_read,
352 http_write,
353 http_seek,
354 http_close,
355};