csu3_am335x/EVSE/Projects/CCS/Apps/exi_engine/codec/EXIHeaderDecoder.c

/*
 * Copyright (C) 2007-2018 Siemens AG
 *
 * This program 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 3 of the License, or
 * (at your option) any later version.
 *
 * This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
 */

/*******************************************************************
 *
 * @author Daniel.Peintner.EXT@siemens.com
 * @version 2017-03-02
 * @contact Richard.Kuntschke@siemens.com
 *
 * <p>Code generated by EXIdizer</p>
 * <p>Schema: V2G_CI_MsgDef.xsd</p>
 *
 *
 ********************************************************************/



#include "EXIHeaderDecoder.h"
#include "BitInputStream.h"
#include "DecoderChannel.h"
#include "ErrorCodes.h"

#ifndef EXI_HEADER_DECODER_C
#define EXI_HEADER_DECODER_C

int readEXIHeader(bitstream_t* stream) {
	int errn;
	uint32_t header = 0;

	/* init stream */
	stream->buffer = 0;
	stream->capacity = 0;

	errn = readBits(stream, 8, &header);
	if (errn == 0) {
		if(header == '$') {
			/*	we do not support "EXI Cookie" */
			errn = EXI_UNSUPPORTED_HEADER_COOKIE;
		} else if ( header & 0x20 ) {
			/* we do not support "Presence Bit for EXI Options" */
			errn = EXI_UNSUPPORTED_HEADER_OPTIONS;
		} else {
			/* Yes, a *simple* header */
			errn = 0;
		}
	}

	return errn;
}


#endif