81 lines
1.9 KiB
C
81 lines
1.9 KiB
C
/**
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* FreeRDP: A Remote Desktop Protocol Client
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* TPKT Headers
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*
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* Copyright 2011 Marc-Andre Moreau <marcandre.moreau@gmail.com>
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "tpkt.h"
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/**
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* TPKT headers are defined in:
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*
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* http://tools.ietf.org/html/rfc1006/
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* RFC 1006 - ISO Transport Service on top of the TCP
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*
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* http://www.itu.int/rec/T-REC-T.123/
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* ITU-T T.123 (01/2007) - Network-specific data protocol stacks for multimedia conferencing
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*
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* TPKT Header
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* ____________________ byte
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* | |
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* | 3 (version) | 1
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* |____________________|
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* | |
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* | Reserved | 2
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* |____________________|
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* | |
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* | Length (MSB) | 3
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* |____________________|
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* | |
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* | Length (LSB) | 4
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* |____________________|
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* | |
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* | TPDU | 5 - ?
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* ....
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*/
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#include <freerdp/utils/stream.h>
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int
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tpkt_read_header(STREAM* s)
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{
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uint8 version;
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uint16 length;
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stream_peek_uint8(s, version);
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if (version == 3)
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{
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stream_seek(s, 2);
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stream_read_uint16(s, length);
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}
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else
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{
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/* not a TPKT header */
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length = -1;
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}
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return length;
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}
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void
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tpkt_write_header(STREAM* s, int length)
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{
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stream_write_uint8(s, 3); /* version */
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stream_write_uint8(s, 8); /* reserved */
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stream_write_uint16(s, length); /* length */
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}
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