ciso8583/src/bitmap.js

NodeJS ISO 8583 Parser

"use strict";

class Bitmap {

    constructor(HexBin){
        this.HexBin = HexBin;
    }

    isSecondaryBitmap(firstBitmapBit){

        let firstBitmapBitBin = this.HexBin.hex2Bin(firstBitmapBit);

        if(firstBitmapBitBin[0] == "1"){
            return true;
        } else {
            return false;
        }

    }

    getFullBitmap(message, withMTI = false){

        let hexadecimalBitmap = "";
        let binaryBitmap = null;
        let bitmapPart = "";

        if(withMTI){
            bitmapPart = message.substring(4);
        } else {
            bitmapPart = message;
        }

        let hexadecimalBitmapLength = 0;

        if (this.isSecondaryBitmap(bitmapPart)){
            hexadecimalBitmapLength = 128/4;
        } else {
            hexadecimalBitmapLength = 64/4;
        }

        hexadecimalBitmap = bitmapPart.substring(0, hexadecimalBitmapLength);

        binaryBitmap = this.HexBin.hex2Bin(hexadecimalBitmap);

        return binaryBitmap;

    }

    isDataElementPresent(fullBitmap, element, hexadecmialBitmap = false){

        if(hexadecmialBitmap){
            fullBitmap = this.getFullBitmap(fullBitmap);
        }

        if(fullBitmap[element - 1] == "1"){
            return true;
        }

        return false;

    }

}

module.exports = Bitmap;