| /* |
| * 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/internal.h" |
| #include "libavutil/opt.h" |
| #include "avformat.h" |
| #if HAVE_DIRENT_H |
| #include <dirent.h> |
| #endif |
| #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 |
| |
| /* Not available in POSIX.1-1996 */ |
| #ifndef S_ISLNK |
| # ifdef S_IFLNK |
| # define S_ISLNK(m) (((m) & S_IFLNK) == S_IFLNK) |
| # else |
| # define S_ISLNK(m) 0 |
| # endif |
| #endif |
| |
| /* Not available in POSIX.1-1996 */ |
| #ifndef S_ISSOCK |
| # ifdef S_IFSOCK |
| # define S_ISSOCK(m) (((m) & S_IFMT) == S_IFSOCK) |
| # else |
| # define S_ISSOCK(m) 0 |
| # endif |
| #endif |
| |
| /* standard file protocol */ |
| |
| typedef struct FileContext { |
| const AVClass *class; |
| int fd; |
| int trunc; |
| int blocksize; |
| int follow; |
| int seekable; |
| #if HAVE_DIRENT_H |
| DIR *dir; |
| #endif |
| } FileContext; |
| |
| static const AVOption file_options[] = { |
| { "truncate", "truncate existing files on write", offsetof(FileContext, trunc), AV_OPT_TYPE_BOOL, { .i64 = 1 }, 0, 1, AV_OPT_FLAG_ENCODING_PARAM }, |
| { "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 }, |
| { "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 }, |
| { "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 }, |
| { NULL } |
| }; |
| |
| static const AVOption pipe_options[] = { |
| { "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 }, |
| { NULL } |
| }; |
| |
| static const AVClass file_class = { |
| .class_name = "file", |
| .item_name = av_default_item_name, |
| .option = file_options, |
| .version = LIBAVUTIL_VERSION_INT, |
| }; |
| |
| static const AVClass pipe_class = { |
| .class_name = "pipe", |
| .item_name = av_default_item_name, |
| .option = pipe_options, |
| .version = LIBAVUTIL_VERSION_INT, |
| }; |
| |
| static int file_read(URLContext *h, unsigned char *buf, int size) |
| { |
| FileContext *c = h->priv_data; |
| int ret; |
| size = FFMIN(size, c->blocksize); |
| ret = read(c->fd, buf, size); |
| if (ret == 0 && c->follow) |
| return AVERROR(EAGAIN); |
| if (ret == 0) |
| return AVERROR_EOF; |
| return (ret == -1) ? AVERROR(errno) : ret; |
| } |
| |
| static int file_write(URLContext *h, const unsigned char *buf, int size) |
| { |
| FileContext *c = h->priv_data; |
| int ret; |
| size = FFMIN(size, c->blocksize); |
| ret = write(c->fd, buf, size); |
| return (ret == -1) ? AVERROR(errno) : ret; |
| } |
| |
| static int file_get_handle(URLContext *h) |
| { |
| FileContext *c = h->priv_data; |
| return c->fd; |
| } |
| |
| static int file_check(URLContext *h, int mask) |
| { |
| int ret = 0; |
| const char *filename = h->filename; |
| av_strstart(filename, "file:", &filename); |
| |
| { |
| #if HAVE_ACCESS && defined(R_OK) |
| if (access(filename, F_OK) < 0) |
| return AVERROR(errno); |
| if (mask&AVIO_FLAG_READ) |
| if (access(filename, R_OK) >= 0) |
| ret |= AVIO_FLAG_READ; |
| if (mask&AVIO_FLAG_WRITE) |
| if (access(filename, W_OK) >= 0) |
| ret |= AVIO_FLAG_WRITE; |
| #else |
| struct stat st; |
| # ifndef _WIN32 |
| ret = stat(filename, &st); |
| # else |
| ret = win32_stat(filename, &st); |
| # endif |
| 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; |
| } |
| |
| static int file_delete(URLContext *h) |
| { |
| #if HAVE_UNISTD_H |
| int ret; |
| const char *filename = h->filename; |
| av_strstart(filename, "file:", &filename); |
| |
| ret = rmdir(filename); |
| if (ret < 0 && (errno == ENOTDIR |
| # ifdef _WIN32 |
| || errno == EINVAL |
| # endif |
| )) |
| ret = unlink(filename); |
| if (ret < 0) |
| return AVERROR(errno); |
| |
| return ret; |
| #else |
| return AVERROR(ENOSYS); |
| #endif /* HAVE_UNISTD_H */ |
| } |
| |
| static int file_move(URLContext *h_src, URLContext *h_dst) |
| { |
| const char *filename_src = h_src->filename; |
| const char *filename_dst = h_dst->filename; |
| av_strstart(filename_src, "file:", &filename_src); |
| av_strstart(filename_dst, "file:", &filename_dst); |
| |
| if (rename(filename_src, filename_dst) < 0) |
| return AVERROR(errno); |
| |
| return 0; |
| } |
| |
| #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 = avpriv_open(filename, access, 0666); |
| if (fd == -1) |
| return AVERROR(errno); |
| c->fd = fd; |
| |
| h->is_streamed = !fstat(fd, &st) && S_ISFIFO(st.st_mode); |
| |
| /* Buffer writes more than the default 32k to improve throughput especially |
| * with networked file systems */ |
| if (!h->is_streamed && flags & AVIO_FLAG_WRITE) |
| h->min_packet_size = h->max_packet_size = 262144; |
| |
| if (c->seekable >= 0) |
| h->is_streamed = !c->seekable; |
| |
| 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); |
| } |
| |
| static int file_open_dir(URLContext *h) |
| { |
| #if HAVE_LSTAT |
| FileContext *c = h->priv_data; |
| |
| c->dir = opendir(h->filename); |
| if (!c->dir) |
| return AVERROR(errno); |
| |
| return 0; |
| #else |
| return AVERROR(ENOSYS); |
| #endif /* HAVE_LSTAT */ |
| } |
| |
| static int file_read_dir(URLContext *h, AVIODirEntry **next) |
| { |
| #if HAVE_LSTAT |
| FileContext *c = h->priv_data; |
| struct dirent *dir; |
| char *fullpath = NULL; |
| |
| *next = ff_alloc_dir_entry(); |
| if (!*next) |
| return AVERROR(ENOMEM); |
| do { |
| errno = 0; |
| dir = readdir(c->dir); |
| if (!dir) { |
| av_freep(next); |
| return AVERROR(errno); |
| } |
| } while (!strcmp(dir->d_name, ".") || !strcmp(dir->d_name, "..")); |
| |
| fullpath = av_append_path_component(h->filename, dir->d_name); |
| if (fullpath) { |
| struct stat st; |
| if (!lstat(fullpath, &st)) { |
| if (S_ISDIR(st.st_mode)) |
| (*next)->type = AVIO_ENTRY_DIRECTORY; |
| else if (S_ISFIFO(st.st_mode)) |
| (*next)->type = AVIO_ENTRY_NAMED_PIPE; |
| else if (S_ISCHR(st.st_mode)) |
| (*next)->type = AVIO_ENTRY_CHARACTER_DEVICE; |
| else if (S_ISBLK(st.st_mode)) |
| (*next)->type = AVIO_ENTRY_BLOCK_DEVICE; |
| else if (S_ISLNK(st.st_mode)) |
| (*next)->type = AVIO_ENTRY_SYMBOLIC_LINK; |
| else if (S_ISSOCK(st.st_mode)) |
| (*next)->type = AVIO_ENTRY_SOCKET; |
| else if (S_ISREG(st.st_mode)) |
| (*next)->type = AVIO_ENTRY_FILE; |
| else |
| (*next)->type = AVIO_ENTRY_UNKNOWN; |
| |
| (*next)->group_id = st.st_gid; |
| (*next)->user_id = st.st_uid; |
| (*next)->size = st.st_size; |
| (*next)->filemode = st.st_mode & 0777; |
| (*next)->modification_timestamp = INT64_C(1000000) * st.st_mtime; |
| (*next)->access_timestamp = INT64_C(1000000) * st.st_atime; |
| (*next)->status_change_timestamp = INT64_C(1000000) * st.st_ctime; |
| } |
| av_free(fullpath); |
| } |
| |
| (*next)->name = av_strdup(dir->d_name); |
| return 0; |
| #else |
| return AVERROR(ENOSYS); |
| #endif /* HAVE_LSTAT */ |
| } |
| |
| static int file_close_dir(URLContext *h) |
| { |
| #if HAVE_LSTAT |
| FileContext *c = h->priv_data; |
| closedir(c->dir); |
| return 0; |
| #else |
| return AVERROR(ENOSYS); |
| #endif /* HAVE_LSTAT */ |
| } |
| |
| const 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, |
| .url_delete = file_delete, |
| .url_move = file_move, |
| .priv_data_size = sizeof(FileContext), |
| .priv_data_class = &file_class, |
| .url_open_dir = file_open_dir, |
| .url_read_dir = file_read_dir, |
| .url_close_dir = file_close_dir, |
| .default_whitelist = "file,crypto,data" |
| }; |
| |
| #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; |
| } |
| |
| const 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), |
| .priv_data_class = &pipe_class, |
| .default_whitelist = "crypto,data" |
| }; |
| |
| #endif /* CONFIG_PIPE_PROTOCOL */ |