zext.plantuml.com.google.zxing.datamatrix.decoder.DataBlock Maven / Gradle / Ivy
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package zext.plantuml.com.google.zxing.datamatrix.decoder;
/**
* Encapsulates a block of data within a Data Matrix Code. Data Matrix Codes may split their data into
* multiple blocks, each of which is a unit of data and error-correction codewords. Each
* is represented by an instance of this class.
*
* @author [email protected] (Brian Brown)
*/
final class DataBlock {
private final int numDataCodewords;
private final byte[] codewords;
private DataBlock(int numDataCodewords, byte[] codewords) {
this.numDataCodewords = numDataCodewords;
this.codewords = codewords;
}
/**
* 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.
// TODO(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;
}
int getNumDataCodewords() {
return numDataCodewords;
}
byte[] getCodewords() {
return codewords;
}
}