public static bool CheckPathAccessModes(FileAccessPermissions permissions, AccessModes request)
{
if (request.HasFlag(AccessModes.R_OK))
{
if (!(permissions.HasFlag(FileAccessPermissions.UserRead) || permissions.HasFlag(FileAccessPermissions.GroupRead) || permissions.HasFlag(FileAccessPermissions.OtherRead)))
{
return(false);
}
}
if (request.HasFlag(AccessModes.W_OK))
{
if (!(permissions.HasFlag(FileAccessPermissions.UserWrite) || permissions.HasFlag(FileAccessPermissions.GroupWrite) || permissions.HasFlag(FileAccessPermissions.OtherWrite)))
{
return(false);
}
}
// ReSharper disable once InvertIf
if (request.HasFlag(AccessModes.X_OK))
{
if (!(permissions.HasFlag(FileAccessPermissions.UserExecute) || permissions.HasFlag(FileAccessPermissions.GroupExecute) || permissions.HasFlag(FileAccessPermissions.OtherExecute)))
{
return(false);
}
}
return(true);
}
protected override Errno OnAccessPath(string path, AccessModes mode)
{
string[] pieces = _vfs.SplitPath(path);
if (pieces.Length == 0)
{
return(mode.HasFlag(AccessModes.W_OK) ? Errno.EROFS : 0);
}
long romSetId = _vfs.GetRomSetId(pieces[0]);
if (romSetId <= 0)
{
return(Errno.ENOENT);
}
RomSet romSet = _vfs.GetRomSet(romSetId);
if (romSet == null)
{
return(Errno.ENOENT);
}
if (pieces.Length == 1)
{
return(mode.HasFlag(AccessModes.W_OK) ? Errno.EROFS : 0);
}
CachedMachine machine = _vfs.GetMachine(romSetId, pieces[1]);
if (machine == null)
{
return(Errno.ENOENT);
}
if (pieces.Length == 2)
{
return(mode.HasFlag(AccessModes.W_OK) ? Errno.EROFS : 0);
}
CachedFile file = _vfs.GetFile(machine.Id, pieces[2]);
if (file != null)
{
if (pieces.Length > 3)
{
return(Errno.ENOSYS);
}
return(mode.HasFlag(AccessModes.W_OK) ? Errno.EROFS : 0);
}
CachedDisk disk = _vfs.GetDisk(machine.Id, pieces[2]);
if (disk != null)
{
if (pieces.Length > 3)
{
return(Errno.ENOSYS);
}
return(mode.HasFlag(AccessModes.W_OK) ? Errno.EROFS : 0);
}
CachedMedia media = _vfs.GetMedia(machine.Id, pieces[2]);
if (media == null)
{
return(Errno.ENOENT);
}
if (pieces.Length > 3)
{
return(Errno.ENOSYS);
}
return(mode.HasFlag(AccessModes.W_OK) ? Errno.EROFS : 0);
}