getuserbarcode/src/reader/ean_8_reader.js

An advanced barcode-scanner written in JavaScript

import EANReader from './ean_reader';

function EAN8Reader(opts, supplements) {
    EANReader.call(this, opts, supplements);
}

var properties = {
    FORMAT: {value: "ean_8", writeable: false}
};

EAN8Reader.prototype = Object.create(EANReader.prototype, properties);
EAN8Reader.prototype.constructor = EAN8Reader;

EAN8Reader.prototype._decodePayload = function(code, result, decodedCodes) {
    var i,
        self = this;

    for ( i = 0; i < 4; i++) {
        code = self._decodeCode(code.end, self.CODE_G_START);
        if (!code) {
            return null;
        }
        result.push(code.code);
        decodedCodes.push(code);
    }

    code = self._findPattern(self.MIDDLE_PATTERN, code.end, true, false);
    if (code === null) {
        return null;
    }
    decodedCodes.push(code);

    for ( i = 0; i < 4; i++) {
        code = self._decodeCode(code.end, self.CODE_G_START);
        if (!code) {
            return null;
        }
        decodedCodes.push(code);
        result.push(code.code);
    }

    return code;
};

export default EAN8Reader;