mirror of
https://code.videolan.org/videolan/vlc
synced 2024-09-04 09:11:33 +02:00
394 lines
10 KiB
C
394 lines
10 KiB
C
/*****************************************************************************
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* file.c: file input (file: access plug-in)
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*****************************************************************************
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* Copyright (C) 2001-2006 VLC authors and VideoLAN
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* Copyright © 2006-2007 Rémi Denis-Courmont
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*
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* Authors: Christophe Massiot <massiot@via.ecp.fr>
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* Rémi Denis-Courmont
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation; either version 2.1 of the License, or
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* (at your option) any later version.
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*
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* This program 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
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* GNU 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 License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
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*****************************************************************************/
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#include <assert.h>
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#include <errno.h>
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#include <limits.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#ifdef HAVE_FSTATVFS
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# include <sys/statvfs.h>
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# if defined (HAVE_SYS_MOUNT_H)
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# include <sys/param.h>
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# include <sys/mount.h>
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# endif
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#endif
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#ifdef HAVE_LINUX_MAGIC_H
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# include <sys/vfs.h>
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# include <linux/magic.h>
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#endif
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#if defined( _WIN32 )
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# include <io.h>
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# include <ctype.h>
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#else
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# include <unistd.h>
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#endif
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#include <vlc_common.h>
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#include "fs.h"
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#include <vlc_access.h>
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#ifdef _WIN32
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# include <vlc_charset.h>
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#endif
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#include <vlc_fs.h>
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#include <vlc_url.h>
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#include <vlc_interrupt.h>
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typedef struct
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{
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int fd;
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bool b_pace_control;
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} access_sys_t;
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#if !defined (_WIN32) && !defined (__OS2__)
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static bool IsRemote (int fd)
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{
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#if defined(__APPLE__)
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/* This has to preceed the general fstatvfs implmentation below,
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* as even though Darwin has fstatvfs, it does not expose the
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* MNT_LOCAL in the statvfs.f_flag field.
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*/
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struct statfs sfs;
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if (fstatfs (fd, &sfs))
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return false;
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return !((sfs.f_flags & MNT_LOCAL) == MNT_LOCAL);
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#elif defined (HAVE_FSTATVFS) && defined (MNT_LOCAL)
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struct statvfs stf;
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if (fstatvfs (fd, &stf))
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return false;
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/* fstatvfs() is in POSIX, but MNT_LOCAL is not */
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return !(stf.f_flag & MNT_LOCAL);
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#elif defined (HAVE_LINUX_MAGIC_H)
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struct statfs stf;
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if (fstatfs (fd, &stf))
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return false;
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switch ((unsigned long)stf.f_type)
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{
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case AFS_SUPER_MAGIC:
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case CODA_SUPER_MAGIC:
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case NCP_SUPER_MAGIC:
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case NFS_SUPER_MAGIC:
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case SMB_SUPER_MAGIC:
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case 0xFF534D42 /*CIFS_MAGIC_NUMBER*/:
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return true;
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}
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return false;
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#else
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(void)fd;
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return false;
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#endif
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}
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# define IsRemote(fd,path) IsRemote(fd)
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#elif defined(_WIN32)
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static bool IsRemote(int fd, const char *path)
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{
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VLC_UNUSED(fd);
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size_t len = strlen(path);
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if (len < 2)
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return false;
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if (path[0] == '\\' && path[1] == '\\')
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return true;
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#if WINAPI_FAMILY_PARTITION(WINAPI_PARTITION_DESKTOP) || NTDDI_VERSION >= NTDDI_WIN10_RS3
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if (path[1] == ':')
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{
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char drive[4];
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drive[0] = path[0]; // can only be < 0x80 if second char is ':'
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drive[1] = ':';
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drive[2] = '\\';
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drive[3] = '\0';
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UINT driveType = GetDriveTypeA(drive);
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switch (driveType)
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{
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case DRIVE_FIXED:
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case DRIVE_REMOVABLE: // but a floppy drive is slower than network
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case DRIVE_RAMDISK:
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case DRIVE_CDROM:
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return false;
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default:
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return true;
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}
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}
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#endif
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return false;
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}
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#else /* __OS2__ */
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static bool IsRemote (const char *path)
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{
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return (! strncmp(path, "\\\\", 2));
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}
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# define IsRemote(fd,path) IsRemote(path)
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#endif
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#ifndef HAVE_POSIX_FADVISE
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# define posix_fadvise(fd, off, len, adv)
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#endif
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static ssize_t Read (stream_t *, void *, size_t);
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static int FileSeek (stream_t *, uint64_t);
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static int FileControl (stream_t *, int, va_list);
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/*****************************************************************************
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* FileOpen: open the file
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*****************************************************************************/
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int FileOpen( vlc_object_t *p_this )
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{
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stream_t *p_access = (stream_t*)p_this;
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/* Open file */
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int fd = -1;
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if (!strcasecmp (p_access->psz_name, "fd"))
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{
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char *end;
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unsigned long oldfd = strtoul(p_access->psz_location, &end, 10);
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if (oldfd > INT_MAX)
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errno = EBADF;
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else if (*end == '\0')
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fd = vlc_dup (oldfd);
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else if (*end == '/' && end > p_access->psz_location)
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{
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char *name = vlc_uri_decode_duplicate (end - 1);
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if (name != NULL)
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{
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name[0] = '.';
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fd = vlc_openat (oldfd, name, O_RDONLY | O_NONBLOCK);
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free (name);
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}
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}
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}
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else
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{
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if (unlikely(p_access->psz_filepath == NULL))
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return VLC_EGENERIC;
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fd = vlc_open (p_access->psz_filepath, O_RDONLY | O_NONBLOCK);
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}
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if (fd == -1)
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{
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msg_Err (p_access, "cannot open file %s (%s)",
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p_access->psz_filepath ? p_access->psz_filepath
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: p_access->psz_location,
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vlc_strerror_c(errno));
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return VLC_EGENERIC;
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}
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struct stat st;
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if (fstat (fd, &st))
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{
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msg_Err (p_access, "read error: %s", vlc_strerror_c(errno));
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goto error;
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}
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#if O_NONBLOCK
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/* Force blocking mode back */
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fcntl (fd, F_SETFL, fcntl (fd, F_GETFL) & ~O_NONBLOCK);
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#endif
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/* Directories can be opened and read from, but only readdir() knows
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* how to parse the data. The directory plugin will do it. */
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if (S_ISDIR (st.st_mode))
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{
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#ifdef HAVE_FDOPENDIR
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DIR *p_dir = fdopendir(fd);
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if (!p_dir) {
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msg_Err (p_access, "fdopendir error: %s", vlc_strerror_c(errno));
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goto error;
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}
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return DirInit (p_access, p_dir);
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#else
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msg_Dbg (p_access, "ignoring directory");
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goto error;
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#endif
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}
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access_sys_t *p_sys = vlc_obj_malloc(p_this, sizeof (*p_sys));
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if (unlikely(p_sys == NULL))
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goto error;
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p_access->pf_read = Read;
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p_access->pf_block = NULL;
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p_access->pf_control = FileControl;
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p_access->p_sys = p_sys;
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p_sys->fd = fd;
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if (S_ISREG (st.st_mode) || S_ISBLK (st.st_mode))
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{
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p_access->pf_seek = FileSeek;
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p_sys->b_pace_control = true;
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/* Demuxers will need the beginning of the file for probing. */
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posix_fadvise (fd, 0, 4096, POSIX_FADV_WILLNEED);
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/* In most cases, we only read the file once. */
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posix_fadvise (fd, 0, 0, POSIX_FADV_NOREUSE);
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#ifdef F_NOCACHE
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fcntl (fd, F_NOCACHE, 0);
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#endif
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#ifdef F_RDAHEAD
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if (IsRemote(fd, p_access->psz_filepath))
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fcntl (fd, F_RDAHEAD, 0);
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else
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fcntl (fd, F_RDAHEAD, 1);
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#endif
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}
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else
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{
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p_access->pf_seek = NULL;
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p_sys->b_pace_control = strcasecmp (p_access->psz_name, "stream");
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}
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return VLC_SUCCESS;
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error:
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vlc_close (fd);
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return VLC_EGENERIC;
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}
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/*****************************************************************************
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* FileClose: close the target
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*****************************************************************************/
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void FileClose (vlc_object_t * p_this)
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{
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stream_t *p_access = (stream_t*)p_this;
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if (p_access->pf_read == NULL)
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{
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DirClose (p_this);
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return;
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}
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access_sys_t *p_sys = p_access->p_sys;
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vlc_close (p_sys->fd);
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}
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static ssize_t Read (stream_t *p_access, void *p_buffer, size_t i_len)
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{
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access_sys_t *p_sys = p_access->p_sys;
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int fd = p_sys->fd;
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ssize_t val = vlc_read_i11e (fd, p_buffer, i_len);
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if (val < 0)
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{
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switch (errno)
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{
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case EINTR:
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case EAGAIN:
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return -1;
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}
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msg_Err (p_access, "read error: %s", vlc_strerror_c(errno));
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val = 0;
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}
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return val;
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}
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/*****************************************************************************
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* Seek: seek to a specific location in a file
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*****************************************************************************/
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static int FileSeek (stream_t *p_access, uint64_t i_pos)
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{
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access_sys_t *sys = p_access->p_sys;
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if (lseek(sys->fd, i_pos, SEEK_SET) == (off_t)-1)
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return VLC_EGENERIC;
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return VLC_SUCCESS;
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}
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/*****************************************************************************
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* Control:
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*****************************************************************************/
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static int FileControl( stream_t *p_access, int i_query, va_list args )
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{
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access_sys_t *p_sys = p_access->p_sys;
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bool *pb_bool;
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vlc_tick_t *pi_64;
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switch( i_query )
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{
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case STREAM_CAN_SEEK:
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case STREAM_CAN_FASTSEEK:
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pb_bool = va_arg( args, bool * );
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*pb_bool = (p_access->pf_seek != NULL);
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break;
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case STREAM_CAN_PAUSE:
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case STREAM_CAN_CONTROL_PACE:
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pb_bool = va_arg( args, bool * );
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*pb_bool = p_sys->b_pace_control;
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break;
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case STREAM_GET_SIZE:
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{
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struct stat st;
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if (fstat (p_sys->fd, &st) || !S_ISREG(st.st_mode))
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return VLC_EGENERIC;
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*va_arg( args, uint64_t * ) = st.st_size;
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break;
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}
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case STREAM_GET_PTS_DELAY:
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pi_64 = va_arg( args, vlc_tick_t * );
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if (IsRemote (p_sys->fd, p_access->psz_filepath))
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*pi_64 = VLC_TICK_FROM_MS(
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var_InheritInteger (p_access, "network-caching") );
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else
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*pi_64 = VLC_TICK_FROM_MS(
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var_InheritInteger (p_access, "file-caching") );
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break;
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case STREAM_SET_PAUSE_STATE:
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/* Nothing to do */
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break;
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default:
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return VLC_EGENERIC;
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}
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return VLC_SUCCESS;
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}
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