cnf-qrcode/src/lib/core/numeric-data.js

generate qrcode,support svg base64 utf8

import * as Mode from './mode';

function NumericData(data) {
  this.mode = Mode.NUMERIC;
  this.data = data.toString();
}

NumericData.getBitsLength = function getBitsLength(length) {
  return 10 * Math.floor(length / 3) + ((length % 3) ? ((length % 3) * 3 + 1) : 0);
};

NumericData.prototype.getLength = function getLength() {
  return this.data.length;
};

NumericData.prototype.getBitsLength = function getBitsLength() {
  return NumericData.getBitsLength(this.data.length);
};

NumericData.prototype.write = function write(bitBuffer) {
  let i,
    group,
    value;

  // The input data string is divided into groups of three digits,
  // and each group is converted to its 10-bit binary equivalent.
  for (i = 0; i + 3 <= this.data.length; i += 3) {
    group = this.data.substr(i, 3);
    value = parseInt(group, 10);

    bitBuffer.put(value, 10);
  }

  // If the number of input digits is not an exact multiple of three,
  // the final one or two digits are converted to 4 or 7 bits respectively.
  const remainingNum = this.data.length - i;
  if (remainingNum > 0) {
    group = this.data.substr(i);
    value = parseInt(group, 10);

    bitBuffer.put(value, remainingNum * 3 + 1);
  }
};

export default NumericData;