libavformat/file.c

   1 /*
   2  * Buffered file io for ffmpeg system
   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 #include "avformat.h"
  22 #include <fcntl.h>
  23 #include <unistd.h>
  24 #include <sys/time.h>
  25
  26
  27 /* standard file protocol */
  28
  29 static int file_open(URLContext *h, const char *filename, int flags)
  30 {
  31     int access;
  32     int fd;
  33
  34     strstart(filename, "file:", &filename);
  35
  36     if (flags & URL_RDWR) {
  37         access = O_CREAT | O_TRUNC | O_RDWR;
  38     } else if (flags & URL_WRONLY) {
  39         access = O_CREAT | O_TRUNC | O_WRONLY;
  40     } else {
  41         access = O_RDONLY;
  42     }
  43 #if defined(__MINGW32__) || defined(CONFIG_OS2) || defined(__CYGWIN__)
  44     access |= O_BINARY;
  45 #endif
  46     fd = open(filename, access, 0666);
  47     if (fd < 0)
  48         return -ENOENT;
  49     h->priv_data = (void *)(size_t)fd;
  50     return 0;
  51 }
  52
  53 static int file_read(URLContext *h, unsigned char *buf, int size)
  54 {
  55     int fd = (size_t)h->priv_data;
  56     return read(fd, buf, size);
  57 }
  58
  59 static int file_write(URLContext *h, unsigned char *buf, int size)
  60 {
  61     int fd = (size_t)h->priv_data;
  62     return write(fd, buf, size);
  63 }
  64
  65 /* XXX: use llseek */
  66 static offset_t file_seek(URLContext *h, offset_t pos, int whence)
  67 {
  68     int fd = (size_t)h->priv_data;
  69     return lseek(fd, pos, whence);
  70 }
  71
  72 static int file_close(URLContext *h)
  73 {
  74     int fd = (size_t)h->priv_data;
  75     return close(fd);
  76 }
  77
  78 URLProtocol file_protocol = {
  79     "file",
  80     file_open,
  81     file_read,
  82     file_write,
  83     file_seek,
  84     file_close,
  85 };
  86
  87 /* pipe protocol */
  88
  89 static int pipe_open(URLContext *h, const char *filename, int flags)
  90 {
  91     int fd;
  92
  93     if (flags & URL_WRONLY) {
  94         fd = 1;
  95     } else {
  96         fd = 0;
  97     }
  98 #if defined(__MINGW32__) || defined(CONFIG_OS2) || defined(__CYGWIN__)
  99     setmode(fd, O_BINARY);
 100 #endif
 101     h->priv_data = (void *)(size_t)fd;
 102     h->is_streamed = 1;
 103     return 0;
 104 }
 105
 106 static int pipe_read(URLContext *h, unsigned char *buf, int size)
 107 {
 108     int fd = (size_t)h->priv_data;
 109     return read(fd, buf, size);
 110 }
 111
 112 static int pipe_write(URLContext *h, unsigned char *buf, int size)
 113 {
 114     int fd = (size_t)h->priv_data;
 115     return write(fd, buf, size);
 116 }
 117
 118 static int pipe_close(URLContext *h)
 119 {
 120     return 0;
 121 }
 122
 123 URLProtocol pipe_protocol = {
 124     "pipe",
 125     pipe_open,
 126     pipe_read,
 127     pipe_write,
 128     NULL,
 129     pipe_close,
 130 };