/* * 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;#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 },    { 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);    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)        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);     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"}; #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"}; #endif /* CONFIG_PIPE_PROTOCOL */