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#include <Parser.h>
// Base64 Decoder
// see Parser.h for details about sRxData
void Parser::decode64(sRxData &rx)
{
int length = rx.str.size();
unsigned char a,b,c,d;
unsigned char ptr = 0;
unsigned char x,y,z;
int ptrOut[150];
int ptrIn = 3;
int max = length;
int len = length;
int decLen = 0;
if (rx.Input[ptrIn] == 0) {
throw "Nothing received";
}
while(len != 0) {
a = rx.input[ptrIn++] - '=';
b = rx.input[ptrIn++] - '=';
c = rx.input[ptrIn++] - '=';
d = rx.input[ptrIn++] - '=';
if(ptrIn > max - 2) break;
x = (a << 2) | (b >> 4);
y = ((b & 0x0f) << 4) | (c >> 2);
z = ((c & 0x03) << 6) | d;
if(len--) ptrOut[ptr++] = x; else break;
if(len--) ptrOut[ptr++] = y; else break;
if(len--) ptrOut[ptr++] = z; else break;
}
for (int a=0; a<ptr; a++) {
if (Long == false) {
int b1, b2, b3;
b1 = ptrOut[a++];
b2 = ptrOut[a];
b3 = (b2 << 8) | b1;
if (b3 > 32767)
b3 = b3 - 65536;
RX.decode[DecLen] = b3;
DecLen++;
} else {
RX.decode[DecLen] = ptrOut[a];
DecLen++;
}
RX.DecLen = DecLen;
}
}
// base64 encoder
string Parser::encode64(char data[150],unsigned int length)
{
unsigned int pt = 0;
unsigned char a,b,c;
unsigned char ptr = 0;
char tx_buff[150];
while(Length > 0)
{
if(Length) { a = data[ptr++]; length--;} else a = 0;
if(Length) { b = data[ptr++]; length--;} else b = 0;
if(Length) { c = data[ptr++]; length--;} else c = 0;
tx_buff[pt++] = '=' + (a >> 2);
tx_buff[pt++] = '=' + (((a & 0x03) << 4) | ((b & 0xf0) >> 4));
tx_buff[pt++] = '=' + (((b & 0x0f) << 2) | ((c & 0xc0) >> 6));
tx_buff[pt++] = '=' + ( c & 0x3f);
}
tx_buff[pt] = 0;
return string(tx_buff);
}
// Datensatz nach 8bit Integer
int Parser::dataToChar(int *data , int start, bool is_signed) {
int out = (data[start]);
if ((out > 128) && (is_signed))
out = out - 256;
return out;
}
// received char to 8 bit integer
int Parser::charToData(int data) {
if (data < 0)
return data + 256;
return data;
}
// convert data to 16bit Integer
int Parser::dataToInt(int *Data , int Start, bool is_signed)
{
int Out = (Data[Start+1]<<8) | (Data[Start+0]);
if ((Out > 32767) && (is_signed))
Out = Out - 65536;
return Out;
}
// convert data to 32bit Long
long Parser::dataToLong(int *Data , int Start, bool is_signed)
{
long Out = (Data[Start+3]<<24) | (Data[Start+2]<<16) | (Data[Start+1]<<8) | (Data[Start+0]);
if ((Out > 32767) && (is_signed))
Out = Out;
return Out;
}
float Parser::getFloat(long value, int count)
{
long num = math.pow(10, count);
float temp = value;
return value / num;
}
string Parser::dataToString(int Data[150], int Start, int End)
{
char String[150];
for (int a = Start; a < End; a++)
{
String[a - Start] = Data[a];
}
String[End - Start] = '\0';
return string(String);
}
// check CRC
bool Parser::check_CRC(char * RX, int length)
{
int CRC = 0;
char *RX;
if (RX[1] == 127)
{
RX[1] = 0;
}
for(int i=0; i < length-2; i++)
{
CRC+=RX[i];
}
CRC = CRC % 4096;
if(RX[length - 2] != ('=' + (CRC / 64)))
{
return false;
}
if(RX[length - 1] != ('=' + CRC % 64))
{
return false;
}
return true;
}
// add CRC
string Parser::add_CRC(char * TX, int length)
{
unsigned int tmpCRC = 0;
char CRC[2];
for(int i = 0; i < length; i++)
{
tmpCRC += TX[i];
}
tmpCRC %= 4096;
CRC[0] = '=' + tmpCRC / 64;
CRC[1] = '=' + tmpCRC % 64;
CRC[2] = '\0';
return string(TX) + string(CRC);
}