/*

 * various OS-feature replacement utilities

 * copyright (c) 2000, 2001, 2002 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

 */

#ifndef AVFORMAT_OS_SUPPORT_H

#define AVFORMAT_OS_SUPPORT_H

/**

 * @file

 * miscellaneous OS support macros and functions.

 */

#include "config.h"

#include <fcntl.h>

#include <sys/stat.h>

#ifndef O_BINARY

#define O_BINARY 0

#endif

#ifdef _WIN32

#if HAVE_DIRECT_H

#include <direct.h>

#endif

#if HAVE_IO_H

#include <io.h>

#endif

#endif

#ifdef _WIN32

#  include <stdint.h>

#  include <sys/types.h>

#  ifdef off_t

#   undef off_t

#  endif

#  define off_t int64_t

#  ifdef lseek

#   undef lseek

#  endif

#  define lseek(f,p,w) _lseeki64((f), (p), (w))

#  ifdef stat

#   undef stat

#  endif

#  define stat win32_stat

    /*

     * The POSIX definition for the stat() function uses a struct of the

     * same name (struct stat), that why it takes this extra effort  for

     * redirecting/replacing the stat() function with our own one which

     * is capable to handle long path names on Windows.

     * The struct below roughly follows the POSIX definition. Time values

     * are 64bit, but in cases when _USE_32BIT_TIME_T is defined, they

     * will be set to values no larger than INT32_MAX which corresponds

     * to file times up to the year 2038.

     */

    struct win32_stat

    {

        _dev_t         st_dev;     /* ID of device containing file */

        _ino_t         st_ino;     /* inode number */

        unsigned short st_mode;    /* protection */

        short          st_nlink;   /* number of hard links */

        short          st_uid;     /* user ID of owner */

        short          st_gid;     /* group ID of owner */

        _dev_t         st_rdev;    /* device ID (if special file) */

        int64_t        st_size;    /* total size, in bytes */

        int64_t        st_atime;   /* time of last access */

        int64_t        st_mtime;   /* time of last modification */

        int64_t        st_ctime;   /* time of last status change */

    };

#  ifdef fstat

#   undef fstat

#  endif

#  define fstat win32_fstat

#endif /* defined(_WIN32) */

#ifdef __ANDROID__

#  if HAVE_UNISTD_H

#    include <unistd.h>

#  endif

#  ifdef lseek

#   undef lseek

#  endif

#  define lseek(f,p,w) lseek64((f), (p), (w))

#endif

static inline int is_dos_path(const char *path)

{

#if HAVE_DOS_PATHS

    if (path[0] && path[1] == ':')

        return 1;

#endif

    return 0;

}

Unexecuted instantiation: url.c:is_dos_path

Unexecuted instantiation: utils.c:is_dos_path

Unexecuted instantiation: avio.c:is_dos_path

Unexecuted instantiation: network.c:is_dos_path

Unexecuted instantiation: os_support.c:is_dos_path

#if defined(_WIN32)

#ifndef S_IRUSR

#define S_IRUSR S_IREAD

#endif

#ifndef S_IWUSR

#define S_IWUSR S_IWRITE

#endif

#endif

#if CONFIG_NETWORK

#if defined(_WIN32)

#define SHUT_RD SD_RECEIVE

#define SHUT_WR SD_SEND

#define SHUT_RDWR SD_BOTH

#else

#include <sys/socket.h>

#if !defined(SHUT_RD) /* OS/2, DJGPP */

#define SHUT_RD 0

#define SHUT_WR 1

#define SHUT_RDWR 2

#endif

#endif

#if !HAVE_SOCKLEN_T

typedef int socklen_t;

#endif

/* most of the time closing a socket is just closing an fd */

#if !HAVE_CLOSESOCKET

#define closesocket close

#endif

#if !HAVE_POLL_H

typedef unsigned long nfds_t;

#if HAVE_WINSOCK2_H

#include <winsock2.h>

#endif

#if !HAVE_STRUCT_POLLFD

struct pollfd {

    int fd;

    short events;  /* events to look for */

    short revents; /* events that occurred */

};

/* events & revents */

#define POLLIN     0x0001  /* any readable data available */

#define POLLOUT    0x0002  /* file descriptor is writeable */

#define POLLRDNORM POLLIN

#define POLLWRNORM POLLOUT

#define POLLRDBAND 0x0008  /* priority readable data */

#define POLLWRBAND 0x0010  /* priority data can be written */

#define POLLPRI    0x0020  /* high priority readable data */

/* revents only */

#define POLLERR    0x0004  /* errors pending */

#define POLLHUP    0x0080  /* disconnected */

#define POLLNVAL   0x1000  /* invalid file descriptor */

#endif

int ff_poll(struct pollfd *fds, nfds_t numfds, int timeout);

#define poll ff_poll

#endif /* HAVE_POLL_H */

#endif /* CONFIG_NETWORK */

#ifdef _WIN32

#include <errno.h>

#include <limits.h>

#include <stdio.h>

#include <windows.h>

#include "libavutil/mem.h"

#include "libavutil/wchar_filename.h"

#ifndef _SSIZE_T_DEFINED

#define _SSIZE_T_DEFINED

typedef SSIZE_T ssize_t;

#endif

#define DEF_FS_FUNCTION(name, wfunc, afunc)               \

static inline int win32_##name(const char *filename_utf8) \

{                                                         \

    wchar_t *filename_w;                                  \

    int ret;                                              \

                                                          \

    if (get_extended_win32_path(filename_utf8, &filename_w)) \

        return -1;                                        \

    if (!filename_w)                                      \

        goto fallback;                                    \

                                                          \

    ret = wfunc(filename_w);                              \

    av_free(filename_w);                                  \

    return ret;                                           \

                                                          \

fallback:                                                 \

    /* filename may be be in CP_ACP */                    \

    return afunc(filename_utf8);                          \

}

DEF_FS_FUNCTION(unlink, _wunlink, _unlink)

DEF_FS_FUNCTION(mkdir,  _wmkdir,  _mkdir)

DEF_FS_FUNCTION(rmdir,  _wrmdir , _rmdir)

static inline int win32_access(const char *filename_utf8, int mode)

{

    wchar_t *filename_w;

    int ret;

    if (get_extended_win32_path(filename_utf8, &filename_w))

        return -1;

    if (!filename_w)

        goto fallback;

    ret = _waccess(filename_w, mode);

    av_free(filename_w);

    return ret;

fallback:

    return _access(filename_utf8, mode);

}

static inline void copy_stat(struct _stat64 *crtstat, struct win32_stat *buf)

{

    buf->st_dev   = crtstat->st_dev;

    buf->st_ino   = crtstat->st_ino;

    buf->st_mode  = crtstat->st_mode;

    buf->st_nlink = crtstat->st_nlink;

    buf->st_uid   = crtstat->st_uid;

    buf->st_gid   = crtstat->st_gid;

    buf->st_rdev  = crtstat->st_rdev;

    buf->st_size  = crtstat->st_size;

    buf->st_atime = crtstat->st_atime;

    buf->st_mtime = crtstat->st_mtime;

    buf->st_ctime = crtstat->st_ctime;

}

static inline int win32_stat(const char *filename_utf8, struct win32_stat *buf)

{

    struct _stat64 crtstat = { 0 };

    wchar_t *filename_w;

    int ret;

    if (get_extended_win32_path(filename_utf8, &filename_w))

        return -1;

    if (filename_w) {

        ret = _wstat64(filename_w, &crtstat);

        av_free(filename_w);

    } else

        ret = _stat64(filename_utf8, &crtstat);

    copy_stat(&crtstat, buf);

    return ret;

}

static inline int win32_fstat(int fd, struct win32_stat *buf)

{

    struct _stat64 crtstat = { 0 };

    int ret;

    ret = _fstat64(fd, &crtstat);

    copy_stat(&crtstat, buf);

    return ret;

}

static inline int win32_rename(const char *src_utf8, const char *dest_utf8)

{

    wchar_t *src_w, *dest_w;

    int ret;

    if (get_extended_win32_path(src_utf8, &src_w))

        return -1;

    if (get_extended_win32_path(dest_utf8, &dest_w)) {

        av_free(src_w);

        return -1;

    }

    if (!src_w || !dest_w) {

        av_free(src_w);

        av_free(dest_w);

        goto fallback;

    }

    ret = (MoveFileExW(src_w, dest_w, MOVEFILE_REPLACE_EXISTING) == 0) ? -1 : 0;

    av_free(src_w);

    av_free(dest_w);

    // Lacking proper mapping from GetLastError() error codes to errno codes

    if (ret)

        errno = EPERM;

    return ret;

fallback:

    /* filename may be be in CP_ACP */

#if !HAVE_UWP

    ret = (MoveFileExA(src_utf8, dest_utf8, MOVEFILE_REPLACE_EXISTING) == 0) ? -1 : 0;

    if (ret)

        errno = EPERM;

#else

    /* Windows Phone doesn't have MoveFileExA, and for Windows Store apps,

     * it is available but not allowed by the app certification kit. However,

     * it's unlikely that anybody would input filenames in CP_ACP there, so this

     * fallback is kept mostly for completeness. Alternatively we could

     * do MultiByteToWideChar(CP_ACP) and use MoveFileExW, but doing

     * explicit conversions with CP_ACP is allegedly forbidden in windows

     * store apps (or windows phone), and the notion of a native code page

     * doesn't make much sense there. */

    ret = rename(src_utf8, dest_utf8);

#endif

    return ret;

}

/*

 * Positional I/O and file locking. Unlike pread() and pwrite() the Windows

 * versions move the file position of the descriptor. A flock() lock covers

 * only the first byte of the file, ReadFile() and WriteFile() of that byte

 * from other processes block or fail while the lock is held. Mapped

 * views of the file are not affected.

 */

#ifndef LOCK_SH

#define LOCK_SH 1

#define LOCK_EX 2

#define LOCK_NB 4

#define LOCK_UN 8

#endif

static inline ssize_t win32_pread(int fd, void *buf, size_t size, off_t offset)

{

    HANDLE fh = (HANDLE)_get_osfhandle(fd);

    OVERLAPPED ov = { .Offset = offset, .OffsetHigh = offset >> 32 };

    DWORD n;

    if (fh == INVALID_HANDLE_VALUE)

        return -1;

    if (size > INT_MAX)

        size = INT_MAX;

    if (!ReadFile(fh, buf, size, &n, &ov)) {

        if (GetLastError() == ERROR_HANDLE_EOF)

            return 0;

        errno = EIO;

        return -1;

    }

    return n;

}

static inline ssize_t win32_pwrite(int fd, const void *buf, size_t size, off_t offset)

{

    HANDLE fh = (HANDLE)_get_osfhandle(fd);

    OVERLAPPED ov = { .Offset = offset, .OffsetHigh = offset >> 32 };

    DWORD n;

    if (fh == INVALID_HANDLE_VALUE)

        return -1;

    if (size > INT_MAX)

        size = INT_MAX;

    if (!WriteFile(fh, buf, size, &n, &ov)) {

        errno = GetLastError() == ERROR_DISK_FULL ? ENOSPC : EIO;

        return -1;

    }

    return n;

}

static inline int win32_flock(int fd, int op)

{

    HANDLE fh = (HANDLE)_get_osfhandle(fd);

    OVERLAPPED ov = { 0 };

    BOOL ok;

    if (fh == INVALID_HANDLE_VALUE)

        return -1;

    if (op & LOCK_UN) {

        ok = UnlockFileEx(fh, 0, 1, 0, &ov);

    } else {

        DWORD flags = 0;

        if (op & LOCK_EX)

            flags |= LOCKFILE_EXCLUSIVE_LOCK;

        if (op & LOCK_NB)

            flags |= LOCKFILE_FAIL_IMMEDIATELY;

        ok = LockFileEx(fh, flags, 0, 1, 0, &ov);

    }

    if (!ok) {

        errno = GetLastError() == ERROR_LOCK_VIOLATION ? EWOULDBLOCK : EIO;

        return -1;

    }

    return 0;

}

#define mkdir(a, b) win32_mkdir(a)

#define rename      win32_rename

#define rmdir       win32_rmdir

#define unlink      win32_unlink

#define access      win32_access

#define pread       win32_pread

#define pwrite      win32_pwrite

#define flock       win32_flock

#endif

#endif /* AVFORMAT_OS_SUPPORT_H */