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 #if HAVE_SETMODE
  26 #include <io.h>
  27 #endif
  28 #include <unistd.h>
  29 #include <sys/time.h>
  30 #include <stdlib.h>
  31 #include "os_support.h"
  32
  33
  34 /* standard file protocol */
  35
  36 static int file_open(URLContext *h, const char *filename, int flags)
  37 {
  38     int access;
  39     int fd;
  40
  41     av_strstart(filename, "file:", &filename);
  42
  43     if (flags & URL_RDWR) {
  44         access = O_CREAT | O_TRUNC | O_RDWR;
  45     } else if (flags & URL_WRONLY) {
  46         access = O_CREAT | O_TRUNC | O_WRONLY;
  47     } else {
  48         access = O_RDONLY;
  49     }
  50 #ifdef O_BINARY
  51     access |= O_BINARY;
  52 #endif
  53     fd = open(filename, access, 0666);
  54     if (fd == -1)
  55         return AVERROR(ENOENT);
  56     h->priv_data = (void *) (intptr_t) fd;
  57     return 0;
  58 }
  59
  60 static int file_read(URLContext *h, unsigned char *buf, int size)
  61 {
  62     int fd = (intptr_t) h->priv_data;
  63     return read(fd, buf, size);
  64 }
  65
  66 static int file_write(URLContext *h, unsigned char *buf, int size)
  67 {
  68     int fd = (intptr_t) h->priv_data;
  69     return write(fd, buf, size);
  70 }
  71
  72 /* XXX: use llseek */
  73 static int64_t file_seek(URLContext *h, int64_t pos, int whence)
  74 {
  75     int fd = (intptr_t) h->priv_data;
  76     return lseek(fd, pos, whence);
  77 }
  78
  79 static int file_close(URLContext *h)
  80 {
  81     int fd = (intptr_t) h->priv_data;
  82     return close(fd);
  83 }
  84
  85 static int file_get_handle(URLContext *h)
  86 {
  87     return (intptr_t) h->priv_data;
  88 }
  89
  90 URLProtocol file_protocol = {
  91     "file",
  92     file_open,
  93     file_read,
  94     file_write,
  95     file_seek,
  96     file_close,
  97     .url_get_file_handle = file_get_handle,
  98 };
  99
 100 /* pipe protocol */
 101
 102 static int pipe_open(URLContext *h, const char *filename, int flags)
 103 {
 104     int fd;
 105     char *final;
 106     av_strstart(filename, "pipe:", &filename);
 107
 108     fd = strtol(filename, &final, 10);
 109     if((filename == final) || *final ) {/* No digits found, or something like 10ab */
 110         if (flags & URL_WRONLY) {
 111             fd = 1;
 112         } else {
 113             fd = 0;
 114         }
 115     }
 116 #if HAVE_SETMODE
 117     setmode(fd, O_BINARY);
 118 #endif
 119     h->priv_data = (void *) (intptr_t) fd;
 120     h->is_streamed = 1;
 121     return 0;
 122 }
 123
 124 URLProtocol pipe_protocol = {
 125     "pipe",
 126     pipe_open,
 127     file_read,
 128     file_write,
 129     .url_get_file_handle = file_get_handle,
 130 };