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
  22 #include "libavutil/avstring.h"
  23 #include "avformat.h"
  24 #include <fcntl.h>
  25 #include <unistd.h>
  26 #include <sys/time.h>
  27 #include <stdlib.h>
  28 #include "os_support.h"
  29
  30
  31 /* standard file protocol */
  32
  33 static int file_open(URLContext *h, const char *filename, int flags)
  34 {
  35     int access;
  36     int fd;
  37
  38     av_strstart(filename, "file:", &filename);
  39
  40     if (flags & URL_RDWR) {
  41         access = O_CREAT | O_TRUNC | O_RDWR;
  42     } else if (flags & URL_WRONLY) {
  43         access = O_CREAT | O_TRUNC | O_WRONLY;
  44     } else {
  45         access = O_RDONLY;
  46     }
  47 #ifdef O_BINARY
  48     access |= O_BINARY;
  49 #endif
  50     fd = open(filename, access, 0666);
  51     if (fd < 0)
  52         return AVERROR(ENOENT);
  53     h->priv_data = (void *)(size_t)fd;
  54     return 0;
  55 }
  56
  57 static int file_read(URLContext *h, unsigned char *buf, int size)
  58 {
  59     int fd = (size_t)h->priv_data;
  60     return read(fd, buf, size);
  61 }
  62
  63 static int file_write(URLContext *h, unsigned char *buf, int size)
  64 {
  65     int fd = (size_t)h->priv_data;
  66     return write(fd, buf, size);
  67 }
  68
  69 /* XXX: use llseek */
  70 static int64_t file_seek(URLContext *h, int64_t pos, int whence)
  71 {
  72     int fd = (size_t)h->priv_data;
  73     return lseek(fd, pos, whence);
  74 }
  75
  76 static int file_close(URLContext *h)
  77 {
  78     int fd = (size_t)h->priv_data;
  79     return close(fd);
  80 }
  81
  82 URLProtocol file_protocol = {
  83     "file",
  84     file_open,
  85     file_read,
  86     file_write,
  87     file_seek,
  88     file_close,
  89 };
  90
  91 /* pipe protocol */
  92
  93 static int pipe_open(URLContext *h, const char *filename, int flags)
  94 {
  95     int fd;
  96     char *final;
  97     av_strstart(filename, "pipe:", &filename);
  98
  99     fd = strtol(filename, &final, 10);
 100     if((filename == final) || *final ) {/* No digits found, or something like 10ab */
 101         if (flags & URL_WRONLY) {
 102             fd = 1;
 103         } else {
 104             fd = 0;
 105         }
 106     }
 107 #ifdef O_BINARY
 108     setmode(fd, O_BINARY);
 109 #endif
 110     h->priv_data = (void *)(size_t)fd;
 111     h->is_streamed = 1;
 112     return 0;
 113 }
 114
 115 URLProtocol pipe_protocol = {
 116     "pipe",
 117     pipe_open,
 118     file_read,
 119     file_write,
 120 };