FreeRDP/libfreerdp-core/ber.c

/**
 * FreeRDP: A Remote Desktop Protocol Client
 * ASN.1 Basic Encoding Rules (BER)
 *
 * Copyright 2011 Marc-Andre Moreau <marcandre.moreau@gmail.com>
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#include "ber.h"

void
ber_write_length(STREAM* s, int length)
{
	if (length > 0x7F)
	{
		stream_write_uint8(s, 0x82);
		stream_write_uint16_be(s, length);
	}
	else
	{
		stream_write_uint8(s, length);
	}
}

void
ber_write_universal_tag(STREAM* s, uint8 tag, int length)
{
	stream_write_uint8(s, (BER_CLASS_UNIV | BER_PRIMITIVE) | (BER_TAG_MASK & tag));
	ber_write_length(s, length);
}

void
ber_write_application_tag(STREAM* s, uint8 tag, int length)
{
	if (tag > 30)
	{
		stream_write_uint8(s, (BER_CLASS_APPL | BER_CONSTRUCT) | BER_TAG_MASK);
		stream_write_uint8(s, tag);
		ber_write_length(s, length);
	}
	else
	{
		stream_write_uint8(s, (BER_CLASS_APPL | BER_CONSTRUCT) | (BER_TAG_MASK & tag));
		ber_write_length(s, length);
	}
}