<commit_before>/*
 * 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.google.zxing.qrcode.decoder;

import com.google.zxing.FormatException;
import com.google.zxing.common.BitSource;
import com.google.zxing.common.CharacterSetECI;
import com.google.zxing.common.DecoderResult;
import com.google.zxing.common.StringUtils;

import java.io.UnsupportedEncodingException;
import java.util.Hashtable;
import java.util.Vector;

/**
 * <p>QR Codes can encode text as bits in one of several modes, and can use multiple modes
 * in one QR Code. This class decodes the bits back into text.</p>
 *
 * <p>See ISO 18004:2006, 6.4.3 - 6.4.7</p>
 *
 * @author <NAME>
 */
final class DecodedBitStreamParser {

  /**
   * See ISO 18004:2006, 6.4.4 Table 5
   */
  private static final char[] ALPHANUMERIC_CHARS = {
      '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B',
      'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N',
      'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z',
      ' ', '$', '%', '*', '+', '-', '.', '/', ':'
  };
  private static final int GB2312_SUBSET = 1;

  private DecodedBitStreamParser() {
  }

  static DecoderResult decode(byte[] bytes, Version version, ErrorCorrectionLevel ecLevel, Hashtable hints)
      throws FormatException {
    BitSource bits = new BitSource(bytes);
    StringBuffer result = new StringBuffer(50);
    CharacterSetECI currentCharacterSetECI = null;
    boolean fc1InEffect = false;
    Vector byteSegments = new Vector(1);
    Mode mode;
    do {
      // While still another segment to read...
      if (bits.available() < 4) {
        // OK, assume we're done. Really, a TERMINATOR mode should have been recorded here
        mode = Mode.TERMINATOR;
      } else {
        try {
          mode = Mode.forBits(bits.readBits(4)); // mode is encoded by 4 bits
        } catch (IllegalArgumentException iae) {
          throw FormatException.getFormatInstance();
        }
      }
      if (!mode.equals(Mode.TERMINATOR)) {
        if (mode.equals(Mode.FNC1_FIRST_POSITION) || mode.equals(Mode.FNC1_SECOND_POSITION)) {
          // We do little with FNC1 except alter the parsed result a bit according to the spec
          fc1InEffect = true;
        } else if (mode.equals(Mode.STRUCTURED_APPEND)) {
          // not really supported; all we do is ignore it
          // Read next 8 bits (symbol sequence #) and 8 bits (parity data), then continue
          bits.readBits(16);
        } else if (mode.equals(Mode.ECI)) {
          // Count doesn't apply to ECI
          int value = parseECIValue(bits);
          currentCharacterSetECI = CharacterSetECI.getCharacterSetECIByValue(value);
          if (currentCharacterSetECI == null) {
            throw FormatException.getFormatInstance();
          }
        } else {
          // First handle Hanzi mode which does not start with character count
          if (mode.equals(Mode.HANZI)) {
        		//chinese mode contains a sub set indicator right after mode indicator
        		int subset = bits.readBits(4);
        		int countHanzi = bits.readBits(mode.getCharacterCountBits(version));
        		if (subset == GB2312_SUBSET) {
        			decodeHanziSegment(bits, result, countHanzi);
            }
          } else {
            // "Normal" QR code modes:
            // How many characters will follow, encoded in this mode?
            int count = bits.readBits(mode.getCharacterCountBits(version));
            if (mode.equals(Mode.NUMERIC)) {
              decodeNumericSegment(bits, result, count);
            } else if (mode.equals(Mode.ALPHANUMERIC)) {
              decodeAlphanumericSegment(bits, result, count, fc1InEffect);
            } else if (mode.equals(Mode.BYTE)) {
              decodeByteSegment(bits, result, count, currentCharacterSetECI, byteSegments, hints);
            } else if (mode.equals(Mode.KANJI)) {
              decodeKanjiSegment(bits, result, count);
            } else {
              throw FormatException.getFormatInstance();
            }
          }
        }
      }
    } while (!mode.equals(Mode.TERMINATOR));

    return new DecoderResult(bytes,
                             result.toString(),
                             byteSegments.isEmpty() ? null : byteSegments,
                             ecLevel.toString());
  }

  /**
   * See specification GBT 18284-2000
   */
  private static void decodeHanziSegment(BitSource bits,
                                         StringBuffer result,
                                         int count) throws FormatException {
    // Each character will require 2 bytes. Read the characters as 2-byte pairs
    // and decode as GB2312 afterwards
    byte[] buffer = new byte[2 * count];
    int offset = 0;
    while (count > 0) {
      // Each 13 bits encodes a 2-byte character
      int twoBytes = bits.readBits(13);
      int assembledTwoBytes = ((twoBytes / 0x060) << 8) | (twoBytes % 0x060);
      if (assembledTwoBytes < 0x003BF) {
        // In the 0xA1A1 to 0xAAFE range
        assembledTwoBytes += 0x0A1A1;
      } else {
        // In the 0xB0A1 to 0xFAFE range
        assembledTwoBytes += 0x0A6A1;<commit_msg>Oops, amendment to last change<commit_after>/*
 * 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.google.zxing.qrcode.decoder;

import com.google.zxing.FormatException;
import com.google.zxing.common.BitSource;
import com.google.zxing.common.CharacterSetECI;
import com.google.zxing.common.DecoderResult;
import com.google.zxing.common.StringUtils;

import java.io.UnsupportedEncodingException;
import java.util.Hashtable;
import java.util.Vector;

/**
 * <p>QR Codes can encode text as bits in one of several modes, and can use multiple modes
 * in one QR Code. This class decodes the bits back into text.</p>
 *
 * <p>See ISO 18004:2006, 6.4.3 - 6.4.7</p>
 *
 * @author <NAME>
 */
final class DecodedBitStreamParser {

  /**
   * See ISO 18004:2006, 6.4.4 Table 5
   */
  private static final char[] ALPHANUMERIC_CHARS = {
      '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B',
      'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N',
      'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z',
      ' ', '$', '%', '*', '+', '-', '.', '/', ':'
  };
  private static final int GB2312_SUBSET = 1;

  private DecodedBitStreamParser() {
  }

  static DecoderResult decode(byte[] bytes, Version version, ErrorCorrectionLevel ecLevel, Hashtable hints)
      throws FormatException {
    BitSource bits = new BitSource(bytes);
    StringBuffer result = new StringBuffer(50);
    CharacterSetECI currentCharacterSetECI = null;
    boolean fc1InEffect = false;
    Vector byteSegments = new Vector(1);
    Mode mode;
    do {
      // While still another segment to read...
      if (bits.available() < 4) {
        // OK, assume we're done. Really, a TERMINATOR mode should have been recorded here
        mode = Mode.TERMINATOR;
      } else {
        try {
          mode = Mode.forBits(bits.readBits(4)); // mode is encoded by 4 bits
        } catch (IllegalArgumentException iae) {
          throw FormatException.getFormatInstance();
        }
      }
      if (!mode.equals(Mode.TERMINATOR)) {
        if (mode.equals(Mode.FNC1_FIRST_POSITION) || mode.equals(Mode.FNC1_SECOND_POSITION)) {
          // We do little with FNC1 except alter the parsed result a bit according to the spec
          fc1InEffect = true;
        } else if (mode.equals(Mode.STRUCTURED_APPEND)) {
          // not really supported; all we do is ignore it
          // Read next 8 bits (symbol sequence #) and 8 bits (parity data), then continue
          bits.readBits(16);
        } else if (mode.equals(Mode.ECI)) {
          // Count doesn't apply to ECI
          int value = parseECIValue(bits);
          currentCharacterSetECI = CharacterSetECI.getCharacterSetECIByValue(value);
          if (currentCharacterSetECI == null) {
            throw FormatException.getFormatInstance();
          }
        } else {
          // First handle Hanzi mode which does not start with character count
          if (mode.equals(Mode.HANZI)) {
        		//chinese mode contains a sub set indicator right after mode indicator
        		int subset = bits.readBits(4);
        		int countHanzi = bits.readBits(mode.getCharacterCountBits(version));
        		if (subset == GB2312_SUBSET) {
        			decodeHanziSegment(bits, result, countHanzi);
            }
          } else {
            // "Normal" QR code modes:
            // How many characters will follow, encoded in this mode?
            int count = bits.readBits(mode.getCharacterCountBits(version));
            if (mode.equals(Mode.NUMERIC)) {
              decodeNumericSegment(bits, result, count);
            } else if (mode.equals(Mode.ALPHANUMERIC)) {
              decodeAlphanumericSegment(bits, result, count, fc1InEffect);
            } else if (mode.equals(Mode.BYTE)) {
              decodeByteSegment(bits, result, count, currentCharacterSetECI, byteSegments, hints);
            } else if (mode.equals(Mode.KANJI)) {
              decodeKanjiSegment(bits, result, count);
            } else {
              throw FormatException.getFormatInstance();
            }
          }
        }
      }
    } while (!mode.equals(Mode.TERMINATOR));

    return new DecoderResult(bytes,
                             result.toString(),
                             byteSegments.isEmpty() ? null : byteSegments,
                             ecLevel == null ? null : ecLevel.toString());
  }

  /**
   * See specification GBT 18284-2000
   */
  private static void decodeHanziSegment(BitSource bits,
                                         StringBuffer result,
                                         int count) throws FormatException {
    // Each character will require 2 bytes. Read the characters as 2-byte pairs
    // and decode as GB2312 afterwards
    byte[] buffer = new byte[2 * count];
    int offset = 0;
    while (count > 0) {
      // Each 13 bits encodes a 2-byte character
      int twoBytes = bits.readBits(13);
      int assembledTwoBytes = ((twoBytes / 0x060) << 8) | (twoBytes % 0x060);
      if (assembledTwoBytes < 0x003BF) {
        // In the 0xA1A1 to 0xAAFE range
        assembledTwoBytes += 0x0A1A1;
      } else {
        // In the 0xB0A1 to 0xFAFE range
        assembledTwoBytes += 0x0A6A1;
{'fraction_non_alphanumeric': 0.11325870211649466, 'fraction_numerical': 0.021689697393737974, 'mean_word_length': 2.3465027802165643, 'pattern_counts': {'":': 0, '<': 21, '<?xml version=': 0, '>': 15, 'https://': 0, 'lorem ipsum': 0, 'www.': 2, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 16, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
{'dir': 'git-commits-cleaned', 'id': '418810', 'n_tokens_mistral': 3513, 'n_tokens_neox': 3328, 'n_words': 1022}