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2ba45a60 DM |
1 | /* |
2 | * buffered file I/O | |
3 | * Copyright (c) 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 | ||
22 | #include "libavutil/avstring.h" | |
23 | #include "libavutil/internal.h" | |
24 | #include "libavutil/opt.h" | |
25 | #include "avformat.h" | |
26 | #include <fcntl.h> | |
27 | #if HAVE_IO_H | |
28 | #include <io.h> | |
29 | #endif | |
30 | #if HAVE_UNISTD_H | |
31 | #include <unistd.h> | |
32 | #endif | |
33 | #include <sys/stat.h> | |
34 | #include <stdlib.h> | |
35 | #include "os_support.h" | |
36 | #include "url.h" | |
37 | ||
38 | /* Some systems may not have S_ISFIFO */ | |
39 | #ifndef S_ISFIFO | |
40 | # ifdef S_IFIFO | |
41 | # define S_ISFIFO(m) (((m) & S_IFMT) == S_IFIFO) | |
42 | # else | |
43 | # define S_ISFIFO(m) 0 | |
44 | # endif | |
45 | #endif | |
46 | ||
47 | /* standard file protocol */ | |
48 | ||
49 | typedef struct FileContext { | |
50 | const AVClass *class; | |
51 | int fd; | |
52 | int trunc; | |
53 | int blocksize; | |
54 | } FileContext; | |
55 | ||
56 | static const AVOption file_options[] = { | |
57 | { "truncate", "truncate existing files on write", offsetof(FileContext, trunc), AV_OPT_TYPE_INT, { .i64 = 1 }, 0, 1, AV_OPT_FLAG_ENCODING_PARAM }, | |
58 | { "blocksize", "set I/O operation maximum block size", offsetof(FileContext, blocksize), AV_OPT_TYPE_INT, { .i64 = INT_MAX }, 1, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM }, | |
59 | { NULL } | |
60 | }; | |
61 | ||
62 | static const AVOption pipe_options[] = { | |
63 | { "blocksize", "set I/O operation maximum block size", offsetof(FileContext, blocksize), AV_OPT_TYPE_INT, { .i64 = INT_MAX }, 1, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM }, | |
64 | { NULL } | |
65 | }; | |
66 | ||
67 | static const AVClass file_class = { | |
68 | .class_name = "file", | |
69 | .item_name = av_default_item_name, | |
70 | .option = file_options, | |
71 | .version = LIBAVUTIL_VERSION_INT, | |
72 | }; | |
73 | ||
74 | static const AVClass pipe_class = { | |
75 | .class_name = "pipe", | |
76 | .item_name = av_default_item_name, | |
77 | .option = pipe_options, | |
78 | .version = LIBAVUTIL_VERSION_INT, | |
79 | }; | |
80 | ||
81 | static int file_read(URLContext *h, unsigned char *buf, int size) | |
82 | { | |
83 | FileContext *c = h->priv_data; | |
84 | int r; | |
85 | size = FFMIN(size, c->blocksize); | |
86 | r = read(c->fd, buf, size); | |
87 | return (-1 == r)?AVERROR(errno):r; | |
88 | } | |
89 | ||
90 | static int file_write(URLContext *h, const unsigned char *buf, int size) | |
91 | { | |
92 | FileContext *c = h->priv_data; | |
93 | int r; | |
94 | size = FFMIN(size, c->blocksize); | |
95 | r = write(c->fd, buf, size); | |
96 | return (-1 == r)?AVERROR(errno):r; | |
97 | } | |
98 | ||
99 | static int file_get_handle(URLContext *h) | |
100 | { | |
101 | FileContext *c = h->priv_data; | |
102 | return c->fd; | |
103 | } | |
104 | ||
105 | static int file_check(URLContext *h, int mask) | |
106 | { | |
107 | int ret = 0; | |
108 | const char *filename = h->filename; | |
109 | av_strstart(filename, "file:", &filename); | |
110 | ||
111 | { | |
112 | #if HAVE_ACCESS && defined(R_OK) | |
113 | if (access(filename, F_OK) < 0) | |
114 | return AVERROR(errno); | |
115 | if (mask&AVIO_FLAG_READ) | |
116 | if (access(filename, R_OK) >= 0) | |
117 | ret |= AVIO_FLAG_READ; | |
118 | if (mask&AVIO_FLAG_WRITE) | |
119 | if (access(filename, W_OK) >= 0) | |
120 | ret |= AVIO_FLAG_WRITE; | |
121 | #else | |
122 | struct stat st; | |
123 | ret = stat(filename, &st); | |
124 | if (ret < 0) | |
125 | return AVERROR(errno); | |
126 | ||
127 | ret |= st.st_mode&S_IRUSR ? mask&AVIO_FLAG_READ : 0; | |
128 | ret |= st.st_mode&S_IWUSR ? mask&AVIO_FLAG_WRITE : 0; | |
129 | #endif | |
130 | } | |
131 | return ret; | |
132 | } | |
133 | ||
134 | #if CONFIG_FILE_PROTOCOL | |
135 | ||
136 | static int file_open(URLContext *h, const char *filename, int flags) | |
137 | { | |
138 | FileContext *c = h->priv_data; | |
139 | int access; | |
140 | int fd; | |
141 | struct stat st; | |
142 | ||
143 | av_strstart(filename, "file:", &filename); | |
144 | ||
145 | if (flags & AVIO_FLAG_WRITE && flags & AVIO_FLAG_READ) { | |
146 | access = O_CREAT | O_RDWR; | |
147 | if (c->trunc) | |
148 | access |= O_TRUNC; | |
149 | } else if (flags & AVIO_FLAG_WRITE) { | |
150 | access = O_CREAT | O_WRONLY; | |
151 | if (c->trunc) | |
152 | access |= O_TRUNC; | |
153 | } else { | |
154 | access = O_RDONLY; | |
155 | } | |
156 | #ifdef O_BINARY | |
157 | access |= O_BINARY; | |
158 | #endif | |
159 | fd = avpriv_open(filename, access, 0666); | |
160 | if (fd == -1) | |
161 | return AVERROR(errno); | |
162 | c->fd = fd; | |
163 | ||
164 | h->is_streamed = !fstat(fd, &st) && S_ISFIFO(st.st_mode); | |
165 | ||
166 | return 0; | |
167 | } | |
168 | ||
169 | /* XXX: use llseek */ | |
170 | static int64_t file_seek(URLContext *h, int64_t pos, int whence) | |
171 | { | |
172 | FileContext *c = h->priv_data; | |
173 | int64_t ret; | |
174 | ||
175 | if (whence == AVSEEK_SIZE) { | |
176 | struct stat st; | |
177 | ret = fstat(c->fd, &st); | |
178 | return ret < 0 ? AVERROR(errno) : (S_ISFIFO(st.st_mode) ? 0 : st.st_size); | |
179 | } | |
180 | ||
181 | ret = lseek(c->fd, pos, whence); | |
182 | ||
183 | return ret < 0 ? AVERROR(errno) : ret; | |
184 | } | |
185 | ||
186 | static int file_close(URLContext *h) | |
187 | { | |
188 | FileContext *c = h->priv_data; | |
189 | return close(c->fd); | |
190 | } | |
191 | ||
192 | URLProtocol ff_file_protocol = { | |
193 | .name = "file", | |
194 | .url_open = file_open, | |
195 | .url_read = file_read, | |
196 | .url_write = file_write, | |
197 | .url_seek = file_seek, | |
198 | .url_close = file_close, | |
199 | .url_get_file_handle = file_get_handle, | |
200 | .url_check = file_check, | |
201 | .priv_data_size = sizeof(FileContext), | |
202 | .priv_data_class = &file_class, | |
203 | }; | |
204 | ||
205 | #endif /* CONFIG_FILE_PROTOCOL */ | |
206 | ||
207 | #if CONFIG_PIPE_PROTOCOL | |
208 | ||
209 | static int pipe_open(URLContext *h, const char *filename, int flags) | |
210 | { | |
211 | FileContext *c = h->priv_data; | |
212 | int fd; | |
213 | char *final; | |
214 | av_strstart(filename, "pipe:", &filename); | |
215 | ||
216 | fd = strtol(filename, &final, 10); | |
217 | if((filename == final) || *final ) {/* No digits found, or something like 10ab */ | |
218 | if (flags & AVIO_FLAG_WRITE) { | |
219 | fd = 1; | |
220 | } else { | |
221 | fd = 0; | |
222 | } | |
223 | } | |
224 | #if HAVE_SETMODE | |
225 | setmode(fd, O_BINARY); | |
226 | #endif | |
227 | c->fd = fd; | |
228 | h->is_streamed = 1; | |
229 | return 0; | |
230 | } | |
231 | ||
232 | URLProtocol ff_pipe_protocol = { | |
233 | .name = "pipe", | |
234 | .url_open = pipe_open, | |
235 | .url_read = file_read, | |
236 | .url_write = file_write, | |
237 | .url_get_file_handle = file_get_handle, | |
238 | .url_check = file_check, | |
239 | .priv_data_size = sizeof(FileContext), | |
240 | .priv_data_class = &pipe_class, | |
241 | }; | |
242 | ||
243 | #endif /* CONFIG_PIPE_PROTOCOL */ |