libav/file.c

   1 /*
   2  * Buffered file io for ffmpeg system
   3  * Copyright (c) 2001 Gerard Lantau
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software
  17  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  18  */
  19 #include <stdlib.h>
  20 #include <stdio.h>
  21 #include <unistd.h>
  22 #include <fcntl.h>
  23 #include <sys/ioctl.h>
  24 #include <errno.h>
  25 #include <sys/time.h>
  26
  27 #include "avformat.h"
  28
  29 /* standard file protocol */
  30
  31 static int file_open(URLContext *h, const char *filename, int flags)
  32 {
  33     int access;
  34     int fd;
  35
  36     if (flags & URL_WRONLY) {
  37         access = O_CREAT | O_TRUNC | O_WRONLY;
  38     } else {
  39         access = O_RDONLY;
  40     }
  41     fd = open(filename, access, 0666);
  42     if (fd < 0)
  43         return -ENOENT;
  44     h->priv_data = (void *)fd;
  45     return 0;
  46 }
  47
  48 static int file_read(URLContext *h, unsigned char *buf, int size)
  49 {
  50     int fd = (int)h->priv_data;
  51     return read(fd, buf, size);
  52 }
  53
  54 static int file_write(URLContext *h, unsigned char *buf, int size)
  55 {
  56     int fd = (int)h->priv_data;
  57     return write(fd, buf, size);
  58 }
  59
  60 /* XXX: use llseek */
  61 static offset_t file_seek(URLContext *h, offset_t pos, int whence)
  62 {
  63     int fd = (int)h->priv_data;
  64     return lseek(fd, pos, whence);
  65 }
  66
  67 static int file_close(URLContext *h)
  68 {
  69     int fd = (int)h->priv_data;
  70     return close(fd);
  71 }
  72
  73 URLProtocol file_protocol = {
  74     "file",
  75     file_open,
  76     file_read,
  77     file_write,
  78     file_seek,
  79     file_close,
  80 };
  81
  82 /* pipe protocol */
  83
  84 static int pipe_open(URLContext *h, const char *filename, int flags)
  85 {
  86     int fd;
  87
  88     if (flags & URL_WRONLY) {
  89         fd = 1;
  90     } else {
  91         fd = 0;
  92     }
  93     h->priv_data = (void *)fd;
  94     return 0;
  95 }
  96
  97 static int pipe_read(URLContext *h, unsigned char *buf, int size)
  98 {
  99     int fd = (int)h->priv_data;
 100     return read(fd, buf, size);
 101 }
 102
 103 static int pipe_write(URLContext *h, unsigned char *buf, int size)
 104 {
 105     int fd = (int)h->priv_data;
 106     return write(fd, buf, size);
 107 }
 108
 109 static int pipe_close(URLContext *h)
 110 {
 111     return 0;
 112 }
 113
 114 URLProtocol pipe_protocol = {
 115     "pipe",
 116     pipe_open,
 117     pipe_read,
 118     pipe_write,
 119     NULL,
 120     pipe_close,
 121 };