File content as of revision 7:ee0569d49c52:

#include "ParseArray.h"
#include <cstdlib>
// constructor
ParseArray::ParseArray()
{
    hasCheckXOR = false;
    hasCRC = false;
    hasFooter = false;
    hasHeader = false;

    headerIndex=0;
    headerLength = 0;
    headerValueTmp="";

    footerIndex = 0;
    footerLength = 0;
    footerValueTmp="";

    checkCRCIndex = 0;
    checkCRCLength = 0 ;
    checkXORIndex = 0;
}
// string to byte function
byte* ParseArray::stringToByte(string hex, int length)
{
    int NumberChars = hex.length();
    byte* bytes = new byte[length];
    long value;
    string subS;
    char arr[2];
    //strtol( &hexstring[1], NULL, 16);
    for (int i = 0; i < length; i += 1) {
        subS = hex.substr(i * 3, 2);
        value = strtol(subS.c_str() , NULL, 16);
        bytes[i] = (byte)value;
    }
    return bytes;
}
// buffer setting
void ParseArray::setBufferValue(byte* buf, int lengthTmp, int checkSumStart)
{
    if (hasCheckXOR) {
        bufferLength = checkXORIndex + 1;
    } else if (hasFooter) {
        bufferLength = footerIndex + footerLength + 1;
    } else if (hasHeader)
        bufferLength = headerIndex + headerLength + 1;
    else
        bufferLength = lengthTmp;


    bufferArray = new byte[bufferLength];

    // header values
    if (hasHeader) {
        for (int i = headerIndex, j = 0; i < headerLength; i++, j++)
            bufferArray[i] = headerValue[j];
        for (int i = headerIndex + headerLength, j = 0; j < lengthTmp; i++, j++)
            bufferArray[i] = buf[j];
    } else {
        for (int j = 0; j < lengthTmp; j++)
            bufferArray[j] = buf[j];
    }
    // footer values
    if (hasFooter) {
        for (int i = footerIndex, j = 0; j < footerLength; i++, j++)
            bufferArray[i] = footerValue[j];
    }
    // compute xorValue
    if (hasCheckXOR) {
        byte xorValue = 0;
        for (int i = checkSumStart; i < bufferLength - 1; i++) {
            xorValue ^= bufferArray[i];
        }
        bufferArray[bufferLength - 1] = xorValue;
    }
}
void ParseArray::setBufferValueAdjustFooterIndex(byte* buf, int buflength, int checkSumStart)
{
    bufferLength = (headerIndex + headerLength + buflength + footerLength + 1);
    bufferArray = new byte[bufferLength];
    int i = 0,j=0;
    // header values
    for ( i = headerIndex, j = 0; i < headerLength; i++, j++)
        bufferArray[i] = headerValue[j];
    for ( i = headerIndex + headerLength, j = 0; j < buflength; i++, j++)
        bufferArray[i] = buf[j];

    // footer values
    for ( i = headerIndex + headerLength + buflength, j = 0; j < footerLength; i++, j++)
        bufferArray[i] = footerValue[j];
    // compute xorValue
    byte xorValue = 0;
    for ( i = checkSumStart; i < bufferLength - 1; i++) {
        xorValue ^= bufferArray[i];
    }
    bufferArray[bufferLength - 1] = xorValue;
}

void ParseArray::setBufferValue(byte* buf,int lengthTmp)
{
    if (hasCheckXOR) {
        bufferLength = checkXORIndex + 1;
    } else if (hasFooter) {
        bufferLength = footerIndex + footerLength + 1;
    } else if (hasHeader)
        bufferLength = headerIndex + headerLength + 1;
    else
        bufferLength = lengthTmp;


    bufferArray = new byte[bufferLength];

    // header values
    if (hasHeader) {
        for (int i = headerIndex, j = 0; i < headerLength; i++, j++)
            bufferArray[i] = headerValue[j];
        for (int i = headerIndex + headerLength, j=0; j < lengthTmp; i++, j++)
            bufferArray[i] = buf[j];
    } else {
        for (int j=0; j<lengthTmp; j++)
            bufferArray[j] = buf[j];
    }
    // footer values
    if (hasFooter) {
        for (int i = footerIndex, j = 0; j < footerLength; i++, j++)
            bufferArray[i] = footerValue[j];
    }
    // compute xorValue
    if (hasCheckXOR) {
        byte xorValue=0;
        for (int i = 0; i < bufferLength - 1; i++) {
            xorValue ^= bufferArray[i];
        }
        bufferArray[bufferLength - 1] = xorValue;
    }
}


// header
void ParseArray::enableHeader(int headerindex, int headerlength, string headervalue)
{
    hasHeader = true;
    headerIndex = headerindex;
    headerLength = headerlength;
    headerValueTmp = headervalue;
    headerValue = stringToByte(headervalue, headerlength);
}
// footer
void ParseArray::enableFooter(int footerindex, int footerlength, string footervalue)
{
    hasFooter = true;
    footerIndex = footerindex;
    footerLength = footerlength;
    footerValueTmp = footervalue;
    footerValue = stringToByte(footervalue, footerlength);
}
// crc
void ParseArray::enableCRC(int crcindex, int crclength)
{
    hasCRC = true;
    checkCRCIndex = crcindex;
    checkCRCLength = crclength;
}
// xorValue
void ParseArray::enableCheckXOR(int xorIndex)
{
    hasCheckXOR = true;
    checkXORIndex = xorIndex;
}



// check Header
bool ParseArray::testHeader(int hindex)
{
    int i;
    for (i = 0; i < headerLength; i++) {
        if (bufferArray[(hindex + i) % bufferLength] != headerValue[i])
            return false;
    }
    return true;
}
// check Footer
bool ParseArray::testFooter(int findex)
{
    int i;
    for (i = 0; i < footerLength; i++) {
        if (bufferArray[(findex + i) % bufferLength] != footerValue[i])
            return false;
    }
    return true;
}
// test xorValue
bool ParseArray::testXOR(int hindex)// set xindex as headerIndex
{
    int i = 0;
    byte xorValue = 0 ;
    for (i = hindex; i < hindex+length; i++) {
        xorValue ^= bufferArray[i % bufferLength];
    }
    if (xorValue == 0)
        return true;
    else
        return false;
}
// parsing
bool ParseArray::parse(int curIndex)
{
    // shift curIndex to end
    if (hasCheckXOR) {
        curIndex -= checkXORIndex;
        curIndex += bufferLength;
        curIndex %= bufferLength;
    } else if (hasFooter) {
        curIndex -= footerIndex;
        curIndex += bufferLength;
        curIndex %= bufferLength;
    }

    curIndex %= bufferLength;

    //
    if (hasHeader) {
        // test header
        if (testHeader(curIndex)) {
            // pass header check
        } else // fail header
            return false;
    }
    // test footer
    if (hasFooter) {
        if (testFooter((curIndex + (footerIndex - headerIndex)) % bufferLength)) {
            // pass footer check
        } else // fail footer
            return false;
    }
    // test xorValue
    if (hasCheckXOR) {
        if (!testXOR(curIndex)) { // fail check
            printf("XOR fail");
            return false;
        }
    }
    // pass all test
    currentHeaderIndex = curIndex;
    currentFooterIndex = (curIndex + (footerIndex - headerIndex));
    return true;
}
// compute xor
byte ParseArray::computeXOR(byte t1[], int len)
{
    byte XOR =0;
    for(int i=0; i<len; i++) {
        XOR=XOR^t1[i]; // xor
    }
    return XOR;
}