yading@11: /*
yading@11:  * buffered file I/O
yading@11:  * Copyright (c) 2001 Fabrice Bellard
yading@11:  *
yading@11:  * This file is part of FFmpeg.
yading@11:  *
yading@11:  * FFmpeg is free software; you can redistribute it and/or
yading@11:  * modify it under the terms of the GNU Lesser General Public
yading@11:  * License as published by the Free Software Foundation; either
yading@11:  * version 2.1 of the License, or (at your option) any later version.
yading@11:  *
yading@11:  * FFmpeg is distributed in the hope that it will be useful,
yading@11:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
yading@11:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
yading@11:  * Lesser General Public License for more details.
yading@11:  *
yading@11:  * You should have received a copy of the GNU Lesser General Public
yading@11:  * License along with FFmpeg; if not, write to the Free Software
yading@11:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
yading@11:  */
yading@11: 
yading@11: #include "libavutil/avstring.h"
yading@11: #include "libavutil/opt.h"
yading@11: #include "avformat.h"
yading@11: #include <fcntl.h>
yading@11: #if HAVE_IO_H
yading@11: #include <io.h>
yading@11: #endif
yading@11: #if HAVE_UNISTD_H
yading@11: #include <unistd.h>
yading@11: #endif
yading@11: #include <sys/stat.h>
yading@11: #include <stdlib.h>
yading@11: #include "os_support.h"
yading@11: #include "url.h"
yading@11: 
yading@11: /* Some systems may not have S_ISFIFO */
yading@11: #ifndef S_ISFIFO
yading@11: #  ifdef S_IFIFO
yading@11: #    define S_ISFIFO(m) (((m) & S_IFMT) == S_IFIFO)
yading@11: #  else
yading@11: #    define S_ISFIFO(m) 0
yading@11: #  endif
yading@11: #endif
yading@11: 
yading@11: /* standard file protocol */
yading@11: 
yading@11: typedef struct FileContext {
yading@11:     const AVClass *class;
yading@11:     int fd;
yading@11:     int trunc;
yading@11: } FileContext;
yading@11: 
yading@11: static const AVOption file_options[] = {
yading@11:     { "truncate", "Truncate existing files on write", offsetof(FileContext, trunc), AV_OPT_TYPE_INT, { .i64 = 1 }, 0, 1, AV_OPT_FLAG_ENCODING_PARAM },
yading@11:     { NULL }
yading@11: };
yading@11: 
yading@11: static const AVClass file_class = {
yading@11:     .class_name = "file",
yading@11:     .item_name  = av_default_item_name,
yading@11:     .option     = file_options,
yading@11:     .version    = LIBAVUTIL_VERSION_INT,
yading@11: };
yading@11: 
yading@11: static int file_read(URLContext *h, unsigned char *buf, int size)
yading@11: {
yading@11:     FileContext *c = h->priv_data;
yading@11:     int r = read(c->fd, buf, size);
yading@11:     return (-1 == r)?AVERROR(errno):r;
yading@11: }
yading@11: 
yading@11: static int file_write(URLContext *h, const unsigned char *buf, int size)
yading@11: {
yading@11:     FileContext *c = h->priv_data;
yading@11:     int r = write(c->fd, buf, size);
yading@11:     return (-1 == r)?AVERROR(errno):r;
yading@11: }
yading@11: 
yading@11: static int file_get_handle(URLContext *h)
yading@11: {
yading@11:     FileContext *c = h->priv_data;
yading@11:     return c->fd;
yading@11: }
yading@11: 
yading@11: static int file_check(URLContext *h, int mask)
yading@11: {
yading@11: #if HAVE_ACCESS && defined(R_OK)
yading@11:     int ret = 0;
yading@11:     if (access(h->filename, F_OK) < 0)
yading@11:         return AVERROR(errno);
yading@11:     if (mask&AVIO_FLAG_READ)
yading@11:         if (access(h->filename, R_OK) >= 0)
yading@11:             ret |= AVIO_FLAG_READ;
yading@11:     if (mask&AVIO_FLAG_WRITE)
yading@11:         if (access(h->filename, W_OK) >= 0)
yading@11:             ret |= AVIO_FLAG_WRITE;
yading@11: #else
yading@11:     struct stat st;
yading@11:     int ret = stat(h->filename, &st);
yading@11:     if (ret < 0)
yading@11:         return AVERROR(errno);
yading@11: 
yading@11:     ret |= st.st_mode&S_IRUSR ? mask&AVIO_FLAG_READ  : 0;
yading@11:     ret |= st.st_mode&S_IWUSR ? mask&AVIO_FLAG_WRITE : 0;
yading@11: #endif
yading@11:     return ret;
yading@11: }
yading@11: 
yading@11: #if CONFIG_FILE_PROTOCOL
yading@11: 
yading@11: static int file_open(URLContext *h, const char *filename, int flags)
yading@11: {
yading@11:     FileContext *c = h->priv_data;
yading@11:     int access;
yading@11:     int fd;
yading@11:     struct stat st;
yading@11: 
yading@11:     av_strstart(filename, "file:", &filename);
yading@11: 
yading@11:     if (flags & AVIO_FLAG_WRITE && flags & AVIO_FLAG_READ) {
yading@11:         access = O_CREAT | O_RDWR;
yading@11:         if (c->trunc)
yading@11:             access |= O_TRUNC;
yading@11:     } else if (flags & AVIO_FLAG_WRITE) {
yading@11:         access = O_CREAT | O_WRONLY;
yading@11:         if (c->trunc)
yading@11:             access |= O_TRUNC;
yading@11:     } else {
yading@11:         access = O_RDONLY;
yading@11:     }
yading@11: #ifdef O_BINARY
yading@11:     access |= O_BINARY;
yading@11: #endif
yading@11:     fd = open(filename, access, 0666);
yading@11:     if (fd == -1)
yading@11:         return AVERROR(errno);
yading@11:     c->fd = fd;
yading@11: 
yading@11:     h->is_streamed = !fstat(fd, &st) && S_ISFIFO(st.st_mode);
yading@11: 
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: /* XXX: use llseek */
yading@11: static int64_t file_seek(URLContext *h, int64_t pos, int whence)
yading@11: {
yading@11:     FileContext *c = h->priv_data;
yading@11:     int64_t ret;
yading@11: 
yading@11:     if (whence == AVSEEK_SIZE) {
yading@11:         struct stat st;
yading@11:         ret = fstat(c->fd, &st);
yading@11:         return ret < 0 ? AVERROR(errno) : (S_ISFIFO(st.st_mode) ? 0 : st.st_size);
yading@11:     }
yading@11: 
yading@11:     ret = lseek(c->fd, pos, whence);
yading@11: 
yading@11:     return ret < 0 ? AVERROR(errno) : ret;
yading@11: }
yading@11: 
yading@11: static int file_close(URLContext *h)
yading@11: {
yading@11:     FileContext *c = h->priv_data;
yading@11:     return close(c->fd);
yading@11: }
yading@11: 
yading@11: URLProtocol ff_file_protocol = {
yading@11:     .name                = "file",
yading@11:     .url_open            = file_open,
yading@11:     .url_read            = file_read,
yading@11:     .url_write           = file_write,
yading@11:     .url_seek            = file_seek,
yading@11:     .url_close           = file_close,
yading@11:     .url_get_file_handle = file_get_handle,
yading@11:     .url_check           = file_check,
yading@11:     .priv_data_size      = sizeof(FileContext),
yading@11:     .priv_data_class     = &file_class,
yading@11: };
yading@11: 
yading@11: #endif /* CONFIG_FILE_PROTOCOL */
yading@11: 
yading@11: #if CONFIG_PIPE_PROTOCOL
yading@11: 
yading@11: static int pipe_open(URLContext *h, const char *filename, int flags)
yading@11: {
yading@11:     FileContext *c = h->priv_data;
yading@11:     int fd;
yading@11:     char *final;
yading@11:     av_strstart(filename, "pipe:", &filename);
yading@11: 
yading@11:     fd = strtol(filename, &final, 10);
yading@11:     if((filename == final) || *final ) {/* No digits found, or something like 10ab */
yading@11:         if (flags & AVIO_FLAG_WRITE) {
yading@11:             fd = 1;
yading@11:         } else {
yading@11:             fd = 0;
yading@11:         }
yading@11:     }
yading@11: #if HAVE_SETMODE
yading@11:     setmode(fd, O_BINARY);
yading@11: #endif
yading@11:     c->fd = fd;
yading@11:     h->is_streamed = 1;
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: URLProtocol ff_pipe_protocol = {
yading@11:     .name                = "pipe",
yading@11:     .url_open            = pipe_open,
yading@11:     .url_read            = file_read,
yading@11:     .url_write           = file_write,
yading@11:     .url_get_file_handle = file_get_handle,
yading@11:     .url_check           = file_check,
yading@11:     .priv_data_size      = sizeof(FileContext),
yading@11: };
yading@11: 
yading@11: #endif /* CONFIG_PIPE_PROTOCOL */