content: /*
   * Copyright 2007 ZXing authors
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *      http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  package com.ailiwean.core.zxing.core.qrcode.decoder;
  
  
  /**
   * <p>See ISO 18004:2006, 6.4.1, Tables 2 and 3. This enum encapsulates the various modes in which
   * data can be encoded to bits in the QR code standard.</p>
   *
   * @author Sean Owen
   */
  public enum Mode {
  
    TERMINATOR(new int[]{0, 0, 0}, 0x00), // Not really a mode...
    NUMERIC(new int[]{10, 12, 14}, 0x01),
    ALPHANUMERIC(new int[]{9, 11, 13}, 0x02),
    STRUCTURED_APPEND(new int[]{0, 0, 0}, 0x03), // Not supported
    BYTE(new int[]{8, 16, 16}, 0x04),
    ECI(new int[]{0, 0, 0}, 0x07), // character counts don't apply
    KANJI(new int[]{8, 10, 12}, 0x08),
    FNC1_FIRST_POSITION(new int[]{0, 0, 0}, 0x05),
    FNC1_SECOND_POSITION(new int[]{0, 0, 0}, 0x09),
    /** See GBT 18284-2000; "Hanzi" is a transliteration of this mode name. */
    HANZI(new int[]{8, 10, 12}, 0x0D);
  
    private final int[] characterCountBitsForVersions;
    private final int bits;
  
    Mode(int[] characterCountBitsForVersions, int bits) {
      this.characterCountBitsForVersions = characterCountBitsForVersions;
      this.bits = bits;
    }
  
    /**
     * @param bits four bits encoding a QR Code data mode
     * @return Mode encoded by these bits
     * @throws IllegalArgumentException if bits do not correspond to a known mode
     */
    public static Mode forBits(int bits) {
      switch (bits) {
        case 0x0:
          return TERMINATOR;
        case 0x1:
          return NUMERIC;
        case 0x2:
          return ALPHANUMERIC;
        case 0x3:
          return STRUCTURED_APPEND;
        case 0x4:
          return BYTE;
        case 0x5:
          return FNC1_FIRST_POSITION;
        case 0x7:
          return ECI;
        case 0x8:
          return KANJI;
        case 0x9:
          return FNC1_SECOND_POSITION;
        case 0xD:
          // 0xD is defined in GBT 18284-2000, may not be supported in foreign country
          return HANZI;
        default:
          throw new IllegalArgumentException();
      }
    }
  
    /**
     * @param version version in question
     * @return number of bits used, in this QR Code symbol {@link Version}, to encode the
     *         count of characters that will follow encoded in this Mode
     */
    public int getCharacterCountBits(Version version) {
      int number = version.getVersionNumber();
      int offset;
      if (number <= 9) {
        offset = 0;
      } else if (number <= 26) {
        offset = 1;
      } else {
        offset = 2;
      }
      return characterCountBitsForVersions[offset];
    }
  
    public int getBits() {
      return bits;
    }
  
  }
  