Esempio n. 1
0
File: Mode.java Progetto: nKey/zxing
 /**
  * @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];
 }
Esempio n. 2
0
 /**
  * @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) {
   if (characterCountBitsForVersions == null) {
     throw new IllegalArgumentException("Character count doesn't apply to this mode");
   }
   int number = version.getVersionNumber();
   int offset;
   if (number <= 9) {
     offset = 0;
   } else if (number <= 26) {
     offset = 1;
   } else {
     offset = 2;
   }
   return characterCountBitsForVersions[offset];
 }
Esempio n. 3
0
  /**
   * When Data Matrix Codes use multiple data blocks, they actually interleave the bytes of each of
   * them. That is, the first byte of data block 1 to n is written, then the second bytes, and so
   * on. This method will separate the data into original blocks.
   *
   * @param rawCodewords bytes as read directly from the Data Matrix Code
   * @param version version of the Data Matrix Code
   * @return {@link DataBlock}s containing original bytes, "de-interleaved" from representation in
   *     the Data Matrix Code
   */
  static DataBlock[] getDataBlocks(byte[] rawCodewords, Version version) {
    // Figure out the number and size of data blocks used by this version
    Version.ECBlocks ecBlocks = version.getECBlocks();

    // First count the total number of data blocks
    int totalBlocks = 0;
    Version.ECB[] ecBlockArray = ecBlocks.getECBlocks();
    for (int i = 0; i < ecBlockArray.length; i++) {
      totalBlocks += ecBlockArray[i].getCount();
    }

    // Now establish DataBlocks of the appropriate size and number of data
    // codewords
    DataBlock[] result = new DataBlock[totalBlocks];
    int numResultBlocks = 0;
    for (int j = 0; j < ecBlockArray.length; j++) {
      Version.ECB ecBlock = ecBlockArray[j];
      for (int i = 0; i < ecBlock.getCount(); i++) {
        int numDataCodewords = ecBlock.getDataCodewords();
        int numBlockCodewords = ecBlocks.getECCodewords() + numDataCodewords;
        result[numResultBlocks++] = new DataBlock(numDataCodewords, new byte[numBlockCodewords]);
      }
    }

    // All blocks have the same amount of data, except that the last n
    // (where n may be 0) have 1 less byte. Figure out where these start.
    // (bbrown): There is only one case where there is a difference for
    // Data Matrix for size 144
    int longerBlocksTotalCodewords = result[0].codewords.length;
    // int shorterBlocksTotalCodewords = longerBlocksTotalCodewords - 1;

    int longerBlocksNumDataCodewords = longerBlocksTotalCodewords - ecBlocks.getECCodewords();
    int shorterBlocksNumDataCodewords = longerBlocksNumDataCodewords - 1;
    // The last elements of result may be 1 element shorter for 144 matrix
    // first fill out as many elements as all of them have minus 1
    int rawCodewordsOffset = 0;
    for (int i = 0; i < shorterBlocksNumDataCodewords; i++) {
      for (int j = 0; j < numResultBlocks; j++) {
        result[j].codewords[i] = rawCodewords[rawCodewordsOffset++];
      }
    }

    // Fill out the last data block in the longer ones
    boolean specialVersion = version.getVersionNumber() == 24;
    int numLongerBlocks = specialVersion ? 8 : numResultBlocks;
    for (int j = 0; j < numLongerBlocks; j++) {
      result[j].codewords[longerBlocksNumDataCodewords - 1] = rawCodewords[rawCodewordsOffset++];
    }

    // Now add in error correction blocks
    int max = result[0].codewords.length;
    for (int i = longerBlocksNumDataCodewords; i < max; i++) {
      for (int j = 0; j < numResultBlocks; j++) {
        int iOffset = (specialVersion && j > 7) ? i - 1 : i;
        result[j].codewords[iOffset] = rawCodewords[rawCodewordsOffset++];
      }
    }

    if (rawCodewordsOffset != rawCodewords.length) {
      throw new IllegalArgumentException();
    }

    return result;
  }