/* * 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 */