bool SFtpStream::Open(SFtp& sftp_, const char *filename, dword mode, int acm)
{
	if(IsOpen())
		Close();
	sftp = &sftp_;
	int iomode = mode & ~SHAREMASK;
	handle = sftp->Open(filename,
						iomode == READ
							? SFtp::READ
							: iomode == CREATE
								? SFtp::READ|SFtp::WRITE|SFtp::CREATE|SFtp::TRUNCATE
								: SFtp::READ|SFtp::WRITE,
						acm
						);
				
	if(handle) {
		SFtpAttrs attrs;
		Zero(attrs);
		if(iomode != CREATE && !sftp->GetAttrs(handle, attrs)) {
			sftp->Close(handle);
			handle = nullptr;
			return false;
		}
		OpenInit(mode, attrs.filesize); // filesize always should be 0 for create|truncate
	}
	return handle;
}