iso8583_esm/lib/bitmap/assembleBitMap.js

A javascript library for messaging in iso 8583 messaging format.

import { Tools as T } from '../tools';
/**
 * Assembles the Bitmap of fields 0-127 for the ISO 8583 message in the Main class Instance.
 * @method assembleBitmap
 * @memberof module:Bitmap-Assemble
 */
export function assembleBitmap() {
    if (this.checkMTI()) {
        const upper = this.hasSpecialFields ? 193 : 128;
        let _map = new Uint8Array(upper);
        const fields = Object.keys(this.Msg);
        // Support backward compat
        if (this.includesSecondaryBitmap || !this.optionalSecondaryBitmap) {
            _map[0] = 1;
        }
        else if (!this.includesSecondaryBitmap) {
            _map = _map.slice(0, 64);
        }
        // construct 128 bit mask
        for (let i = 0; i < fields.length; i++) {
            const field = parseInt(fields[i], 10);
            if (field > 1) {
                _map[field - 1] = 1;
            }
        }
        this.bitmaps = _map;
        return _map;
    }
    else
        return T.toErrorObject('bitmap error, iso message type undefined or invalid');
}