Tries to workaround ZBars unreliable charset detection for qr codes.

ZBarCharsetDetectionFixer.java

public class ZBarCharsetDetectionFixer {
  private static final CharsetDecoder latin1CharsetDecoder = Charset.forName("ISO-8859-1").newDecoder();
  private static final CharsetEncoder sjisCharsetEncoder = Charset.forName("SJIS").newEncoder();
  
  /**
   * Tries to workaround ZBars unreliable charset detection for qr codes.
   *
   * What it does:
   * Encodes String to Shift-JS, decodes the resulting bytes to ISO-8859-1.
   *
   * @param input The input string from ZBar.
   * @return Correct encoded string.
   */
  public String fixWeirdness(String input) {
    try {
      return latin1CharsetDecoder.decode(sjisCharsetEncoder.encode(CharBuffer.wrap(input))).toString();
    } catch (CharacterCodingException e) {
      // this should be okay b/c it probably was not detected as shift-jis
    }

    return input;
  }
}