| 0,0 → 1,203 |
|---|
| #include <Parser.h> |
| |
| // Base64 Decoder |
| // see Parser.h for details about sRxData |
| bool 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) { |
| return false; |
| //TODO: catch error to show that something went wrong during the decode process |
| //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 (length == 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; |
| } |
| return true; |
| } |
| |
| // 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 = pow(10, count); |
| |
| float temp = value; |
| |
| return temp / 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(string RXstr) |
| { |
| int length = RXstr.size(); |
| int CRC = 0; |
| char *RX = (char *)RXstr.c_str(); |
| |
| 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(string TX) |
| { |
| int length = TX.size(); |
| 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); |
| } |
| |