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gpsprotocol.cpp
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gpsprotocol.cpp
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/*
ent-ghost
Copyright [2011-2013] [Jack Lu]
This file is part of the ent-ghost source code.
ent-ghost is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
ent-ghost source code 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with ent-ghost source code. If not, see <http://www.gnu.org/licenses/>.
ent-ghost is modified from GHost++ (http://ghostplusplus.googlecode.com/)
GHost++ is Copyright [2008] [Trevor Hogan]
*/
#include "ghost.h"
#include "util.h"
#include "gpsprotocol.h"
//
// CGPSProtocol
//
CGPSProtocol :: CGPSProtocol( )
{
}
CGPSProtocol :: ~CGPSProtocol( )
{
}
///////////////////////
// RECEIVE FUNCTIONS //
///////////////////////
////////////////////
// SEND FUNCTIONS //
////////////////////
BYTEARRAY CGPSProtocol :: SEND_GPSC_INIT( uint32_t version )
{
BYTEARRAY packet;
packet.push_back( GPS_HEADER_CONSTANT );
packet.push_back( GPS_INIT );
packet.push_back( 0 );
packet.push_back( 0 );
UTIL_AppendByteArray( packet, version, false );
AssignLength( packet );
return packet;
}
BYTEARRAY CGPSProtocol :: SEND_GPSC_RECONNECT( unsigned char PID, uint32_t reconnectKey, uint32_t lastPacket )
{
BYTEARRAY packet;
packet.push_back( GPS_HEADER_CONSTANT );
packet.push_back( GPS_RECONNECT );
packet.push_back( 0 );
packet.push_back( 0 );
packet.push_back( PID );
UTIL_AppendByteArray( packet, reconnectKey, false );
UTIL_AppendByteArray( packet, lastPacket, false );
AssignLength( packet );
return packet;
}
BYTEARRAY CGPSProtocol :: SEND_GPSC_ACK( uint32_t lastPacket )
{
BYTEARRAY packet;
packet.push_back( GPS_HEADER_CONSTANT );
packet.push_back( GPS_ACK );
packet.push_back( 0 );
packet.push_back( 0 );
UTIL_AppendByteArray( packet, lastPacket, false );
AssignLength( packet );
return packet;
}
BYTEARRAY CGPSProtocol :: SEND_GPSS_INIT( uint16_t reconnectPort, unsigned char PID, uint32_t reconnectKey, unsigned char numEmptyActions )
{
BYTEARRAY packet;
packet.push_back( GPS_HEADER_CONSTANT );
packet.push_back( GPS_INIT );
packet.push_back( 0 );
packet.push_back( 0 );
UTIL_AppendByteArray( packet, reconnectPort, false );
packet.push_back( PID );
UTIL_AppendByteArray( packet, reconnectKey, false );
packet.push_back( numEmptyActions );
AssignLength( packet );
return packet;
}
BYTEARRAY CGPSProtocol :: SEND_GPSS_RECONNECT( uint32_t lastPacket )
{
BYTEARRAY packet;
packet.push_back( GPS_HEADER_CONSTANT );
packet.push_back( GPS_RECONNECT );
packet.push_back( 0 );
packet.push_back( 0 );
UTIL_AppendByteArray( packet, lastPacket, false );
AssignLength( packet );
return packet;
}
BYTEARRAY CGPSProtocol :: SEND_GPSS_ACK( uint32_t lastPacket )
{
BYTEARRAY packet;
packet.push_back( GPS_HEADER_CONSTANT );
packet.push_back( GPS_ACK );
packet.push_back( 0 );
packet.push_back( 0 );
UTIL_AppendByteArray( packet, lastPacket, false );
AssignLength( packet );
return packet;
}
BYTEARRAY CGPSProtocol :: SEND_GPSS_REJECT( uint32_t reason )
{
BYTEARRAY packet;
packet.push_back( GPS_HEADER_CONSTANT );
packet.push_back( GPS_REJECT );
packet.push_back( 0 );
packet.push_back( 0 );
UTIL_AppendByteArray( packet, reason, false );
AssignLength( packet );
return packet;
}
BYTEARRAY CGPSProtocol :: SEND_GPSS_SUPPORT_EXTENDED( uint32_t seconds )
{
BYTEARRAY packet;
packet.push_back( GPS_HEADER_CONSTANT );
packet.push_back( GPS_SUPPORT_EXTENDED );
packet.push_back( 0 );
packet.push_back( 0 );
UTIL_AppendByteArray( packet, seconds, false );
AssignLength( packet );
return packet;
}
/////////////////////
// OTHER FUNCTIONS //
/////////////////////
bool CGPSProtocol :: AssignLength( BYTEARRAY &content )
{
// insert the actual length of the content array into bytes 3 and 4 (indices 2 and 3)
BYTEARRAY LengthBytes;
if( content.size( ) >= 4 && content.size( ) <= 65535 )
{
LengthBytes = UTIL_CreateByteArray( (uint16_t)content.size( ), false );
content[2] = LengthBytes[0];
content[3] = LengthBytes[1];
return true;
}
return false;
}
bool CGPSProtocol :: ValidateLength( BYTEARRAY &content )
{
// verify that bytes 3 and 4 (indices 2 and 3) of the content array describe the length
uint16_t Length;
BYTEARRAY LengthBytes;
if( content.size( ) >= 4 && content.size( ) <= 65535 )
{
LengthBytes.push_back( content[2] );
LengthBytes.push_back( content[3] );
Length = UTIL_ByteArrayToUInt16( LengthBytes, false );
if( Length == content.size( ) )
return true;
}
return false;
}