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

generate qrcode,support svg base64 utf8

import * as Utils from './utils';
import * as Mode from './mode';

function KanjiData(data) {
  this.mode = Mode.KANJI;
  this.data = data;
}

KanjiData.getBitsLength = function getBitsLength(length) {
  return length * 13;
};

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

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

KanjiData.prototype.write = function(bitBuffer) {
  let i;

  // In the Shift JIS system, Kanji characters are represented by a two byte combination.
  // These byte values are shifted from the JIS X 0208 values.
  // JIS X 0208 gives details of the shift coded representation.
  for (i = 0; i < this.data.length; i++) {
    let value = Utils.toSJIS(this.data[i]);

    // For characters with Shift JIS values from 0x8140 to 0x9FFC:
    if (value >= 0x8140 && value <= 0x9FFC) {
      // Subtract 0x8140 from Shift JIS value
      value -= 0x8140;

      // For characters with Shift JIS values from 0xE040 to 0xEBBF
    } else if (value >= 0xE040 && value <= 0xEBBF) {
      // Subtract 0xC140 from Shift JIS value
      value -= 0xC140;
    } else {
      throw new Error(
        `Invalid SJIS character: ${this.data[i]}\n`
        + `Make sure your charset is UTF-8`,
      );
    }

    // Multiply most significant byte of result by 0xC0
    // and add least significant byte to product
    value = (((value >>> 8) & 0xff) * 0xC0) + (value & 0xff);

    // Convert result to a 13-bit binary string
    bitBuffer.put(value, 13);
  }
};

export default KanjiData;