mirror of https://git.ffmpeg.org/ffmpeg.git
415 lines
11 KiB
C
415 lines
11 KiB
C
/*
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* buffered file I/O
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* Copyright (c) 2001 Fabrice Bellard
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "config_components.h"
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#include "libavutil/avstring.h"
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#include "libavutil/file_open.h"
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#include "libavutil/internal.h"
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#include "libavutil/opt.h"
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#include "avio.h"
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#if HAVE_DIRENT_H
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#include <dirent.h>
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#endif
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#include <fcntl.h>
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#if HAVE_IO_H
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#include <io.h>
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#endif
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#if HAVE_UNISTD_H
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#include <unistd.h>
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#endif
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#include <sys/stat.h>
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#include <stdlib.h>
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#include "os_support.h"
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#include "url.h"
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/* Some systems may not have S_ISFIFO */
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#ifndef S_ISFIFO
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# ifdef S_IFIFO
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# define S_ISFIFO(m) (((m) & S_IFMT) == S_IFIFO)
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# else
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# define S_ISFIFO(m) 0
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# endif
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#endif
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/* Not available in POSIX.1-1996 */
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#ifndef S_ISLNK
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# ifdef S_IFLNK
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# define S_ISLNK(m) (((m) & S_IFLNK) == S_IFLNK)
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# else
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# define S_ISLNK(m) 0
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# endif
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#endif
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/* Not available in POSIX.1-1996 */
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#ifndef S_ISSOCK
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# ifdef S_IFSOCK
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# define S_ISSOCK(m) (((m) & S_IFMT) == S_IFSOCK)
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# else
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# define S_ISSOCK(m) 0
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# endif
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#endif
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/* standard file protocol */
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typedef struct FileContext {
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const AVClass *class;
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int fd;
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int trunc;
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int blocksize;
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int follow;
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int seekable;
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#if HAVE_DIRENT_H
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DIR *dir;
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#endif
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} FileContext;
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static const AVOption file_options[] = {
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{ "truncate", "truncate existing files on write", offsetof(FileContext, trunc), AV_OPT_TYPE_BOOL, { .i64 = 1 }, 0, 1, AV_OPT_FLAG_ENCODING_PARAM },
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{ "blocksize", "set I/O operation maximum block size", offsetof(FileContext, blocksize), AV_OPT_TYPE_INT, { .i64 = INT_MAX }, 1, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM },
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{ "follow", "Follow a file as it is being written", offsetof(FileContext, follow), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, AV_OPT_FLAG_DECODING_PARAM },
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{ "seekable", "Sets if the file is seekable", offsetof(FileContext, seekable), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, 0, AV_OPT_FLAG_DECODING_PARAM | AV_OPT_FLAG_ENCODING_PARAM },
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{ NULL }
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};
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static const AVOption pipe_options[] = {
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{ "blocksize", "set I/O operation maximum block size", offsetof(FileContext, blocksize), AV_OPT_TYPE_INT, { .i64 = INT_MAX }, 1, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM },
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{ NULL }
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};
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static const AVClass file_class = {
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.class_name = "file",
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.item_name = av_default_item_name,
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.option = file_options,
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.version = LIBAVUTIL_VERSION_INT,
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};
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static const AVClass pipe_class = {
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.class_name = "pipe",
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.item_name = av_default_item_name,
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.option = pipe_options,
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.version = LIBAVUTIL_VERSION_INT,
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};
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static int file_read(URLContext *h, unsigned char *buf, int size)
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{
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FileContext *c = h->priv_data;
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int ret;
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size = FFMIN(size, c->blocksize);
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ret = read(c->fd, buf, size);
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if (ret == 0 && c->follow)
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return AVERROR(EAGAIN);
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if (ret == 0)
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return AVERROR_EOF;
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return (ret == -1) ? AVERROR(errno) : ret;
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}
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static int file_write(URLContext *h, const unsigned char *buf, int size)
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{
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FileContext *c = h->priv_data;
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int ret;
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size = FFMIN(size, c->blocksize);
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ret = write(c->fd, buf, size);
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return (ret == -1) ? AVERROR(errno) : ret;
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}
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static int file_get_handle(URLContext *h)
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{
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FileContext *c = h->priv_data;
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return c->fd;
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}
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static int file_check(URLContext *h, int mask)
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{
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int ret = 0;
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const char *filename = h->filename;
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av_strstart(filename, "file:", &filename);
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{
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#if HAVE_ACCESS && defined(R_OK)
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if (access(filename, F_OK) < 0)
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return AVERROR(errno);
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if (mask&AVIO_FLAG_READ)
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if (access(filename, R_OK) >= 0)
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ret |= AVIO_FLAG_READ;
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if (mask&AVIO_FLAG_WRITE)
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if (access(filename, W_OK) >= 0)
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ret |= AVIO_FLAG_WRITE;
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#else
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struct stat st;
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ret = stat(filename, &st);
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if (ret < 0)
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return AVERROR(errno);
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ret |= st.st_mode&S_IRUSR ? mask&AVIO_FLAG_READ : 0;
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ret |= st.st_mode&S_IWUSR ? mask&AVIO_FLAG_WRITE : 0;
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#endif
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}
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return ret;
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}
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#if CONFIG_FILE_PROTOCOL
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static int file_delete(URLContext *h)
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{
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#if HAVE_UNISTD_H
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int ret;
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const char *filename = h->filename;
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av_strstart(filename, "file:", &filename);
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ret = rmdir(filename);
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if (ret < 0 && (errno == ENOTDIR
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# ifdef _WIN32
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|| errno == EINVAL
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# endif
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))
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ret = unlink(filename);
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if (ret < 0)
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return AVERROR(errno);
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return ret;
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#else
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return AVERROR(ENOSYS);
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#endif /* HAVE_UNISTD_H */
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}
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static int file_move(URLContext *h_src, URLContext *h_dst)
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{
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const char *filename_src = h_src->filename;
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const char *filename_dst = h_dst->filename;
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av_strstart(filename_src, "file:", &filename_src);
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av_strstart(filename_dst, "file:", &filename_dst);
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if (rename(filename_src, filename_dst) < 0)
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return AVERROR(errno);
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return 0;
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}
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static int file_open(URLContext *h, const char *filename, int flags)
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{
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FileContext *c = h->priv_data;
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int access;
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int fd;
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struct stat st;
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av_strstart(filename, "file:", &filename);
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if (flags & AVIO_FLAG_WRITE && flags & AVIO_FLAG_READ) {
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access = O_CREAT | O_RDWR;
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if (c->trunc)
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access |= O_TRUNC;
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} else if (flags & AVIO_FLAG_WRITE) {
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access = O_CREAT | O_WRONLY;
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if (c->trunc)
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access |= O_TRUNC;
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} else {
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access = O_RDONLY;
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}
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#ifdef O_BINARY
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access |= O_BINARY;
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#endif
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fd = avpriv_open(filename, access, 0666);
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if (fd == -1)
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return AVERROR(errno);
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c->fd = fd;
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h->is_streamed = !fstat(fd, &st) && S_ISFIFO(st.st_mode);
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/* Buffer writes more than the default 32k to improve throughput especially
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* with networked file systems */
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if (!h->is_streamed && flags & AVIO_FLAG_WRITE)
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h->min_packet_size = h->max_packet_size = 262144;
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if (c->seekable >= 0)
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h->is_streamed = !c->seekable;
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return 0;
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}
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/* XXX: use llseek */
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static int64_t file_seek(URLContext *h, int64_t pos, int whence)
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{
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FileContext *c = h->priv_data;
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int64_t ret;
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if (whence == AVSEEK_SIZE) {
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struct stat st;
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ret = fstat(c->fd, &st);
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return ret < 0 ? AVERROR(errno) : (S_ISFIFO(st.st_mode) ? 0 : st.st_size);
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}
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ret = lseek(c->fd, pos, whence);
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return ret < 0 ? AVERROR(errno) : ret;
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}
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static int file_close(URLContext *h)
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{
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FileContext *c = h->priv_data;
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int ret = close(c->fd);
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return (ret == -1) ? AVERROR(errno) : 0;
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}
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static int file_open_dir(URLContext *h)
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{
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#if HAVE_LSTAT
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FileContext *c = h->priv_data;
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c->dir = opendir(h->filename);
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if (!c->dir)
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return AVERROR(errno);
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return 0;
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#else
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return AVERROR(ENOSYS);
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#endif /* HAVE_LSTAT */
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}
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static int file_read_dir(URLContext *h, AVIODirEntry **next)
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{
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#if HAVE_LSTAT
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FileContext *c = h->priv_data;
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struct dirent *dir;
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char *fullpath = NULL;
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*next = ff_alloc_dir_entry();
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if (!*next)
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return AVERROR(ENOMEM);
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do {
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errno = 0;
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dir = readdir(c->dir);
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if (!dir) {
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av_freep(next);
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return AVERROR(errno);
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}
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} while (!strcmp(dir->d_name, ".") || !strcmp(dir->d_name, ".."));
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fullpath = av_append_path_component(h->filename, dir->d_name);
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if (fullpath) {
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struct stat st;
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if (!lstat(fullpath, &st)) {
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if (S_ISDIR(st.st_mode))
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(*next)->type = AVIO_ENTRY_DIRECTORY;
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else if (S_ISFIFO(st.st_mode))
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(*next)->type = AVIO_ENTRY_NAMED_PIPE;
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else if (S_ISCHR(st.st_mode))
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(*next)->type = AVIO_ENTRY_CHARACTER_DEVICE;
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else if (S_ISBLK(st.st_mode))
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(*next)->type = AVIO_ENTRY_BLOCK_DEVICE;
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else if (S_ISLNK(st.st_mode))
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(*next)->type = AVIO_ENTRY_SYMBOLIC_LINK;
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else if (S_ISSOCK(st.st_mode))
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(*next)->type = AVIO_ENTRY_SOCKET;
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else if (S_ISREG(st.st_mode))
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(*next)->type = AVIO_ENTRY_FILE;
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else
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(*next)->type = AVIO_ENTRY_UNKNOWN;
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(*next)->group_id = st.st_gid;
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(*next)->user_id = st.st_uid;
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(*next)->size = st.st_size;
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(*next)->filemode = st.st_mode & 0777;
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(*next)->modification_timestamp = INT64_C(1000000) * st.st_mtime;
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(*next)->access_timestamp = INT64_C(1000000) * st.st_atime;
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(*next)->status_change_timestamp = INT64_C(1000000) * st.st_ctime;
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}
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av_free(fullpath);
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}
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(*next)->name = av_strdup(dir->d_name);
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return 0;
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#else
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return AVERROR(ENOSYS);
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#endif /* HAVE_LSTAT */
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}
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static int file_close_dir(URLContext *h)
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{
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#if HAVE_LSTAT
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FileContext *c = h->priv_data;
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closedir(c->dir);
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return 0;
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#else
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return AVERROR(ENOSYS);
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#endif /* HAVE_LSTAT */
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}
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const URLProtocol ff_file_protocol = {
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.name = "file",
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.url_open = file_open,
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.url_read = file_read,
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.url_write = file_write,
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.url_seek = file_seek,
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.url_close = file_close,
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.url_get_file_handle = file_get_handle,
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.url_check = file_check,
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.url_delete = file_delete,
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.url_move = file_move,
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.priv_data_size = sizeof(FileContext),
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.priv_data_class = &file_class,
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.url_open_dir = file_open_dir,
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.url_read_dir = file_read_dir,
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.url_close_dir = file_close_dir,
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.default_whitelist = "file,crypto,data"
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};
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#endif /* CONFIG_FILE_PROTOCOL */
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#if CONFIG_PIPE_PROTOCOL
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static int pipe_open(URLContext *h, const char *filename, int flags)
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{
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FileContext *c = h->priv_data;
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int fd;
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char *final;
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av_strstart(filename, "pipe:", &filename);
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fd = strtol(filename, &final, 10);
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if((filename == final) || *final ) {/* No digits found, or something like 10ab */
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if (flags & AVIO_FLAG_WRITE) {
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fd = 1;
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} else {
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fd = 0;
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}
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}
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#if HAVE_SETMODE
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setmode(fd, O_BINARY);
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#endif
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c->fd = fd;
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h->is_streamed = 1;
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return 0;
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}
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const URLProtocol ff_pipe_protocol = {
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.name = "pipe",
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.url_open = pipe_open,
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.url_read = file_read,
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.url_write = file_write,
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.url_get_file_handle = file_get_handle,
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.url_check = file_check,
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.priv_data_size = sizeof(FileContext),
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.priv_data_class = &pipe_class,
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.default_whitelist = "crypto,data"
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};
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#endif /* CONFIG_PIPE_PROTOCOL */
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