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