/// <summary>
/// <p>Decodes a Data Matrix Code represented as a <see cref="BitMatrix" />. A 1 or "true" is taken
/// to mean a black module.</p>
/// </summary>
/// <param name="bits">booleans representing white/black Data Matrix Code modules</param>
/// <returns>text and bytes encoded within the Data Matrix Code</returns>
public DecoderResult decode(BitMatrix bits)
{
// Construct a parser and read version, error-correction level
BitMatrixParser parser = new BitMatrixParser(bits);
if (parser.Version == null)
{
return(null);
}
// Read codewords
byte[] codewords = parser.readCodewords();
if (codewords == null)
{
return(null);
}
// Separate into data blocks
DataBlock[] dataBlocks = DataBlock.getDataBlocks(codewords, parser.Version);
// Count total number of data bytes
int totalBytes = 0;
foreach (var db in dataBlocks)
{
totalBytes += db.NumDataCodewords;
}
byte[] resultBytes = new byte[totalBytes];
// Error-correct and copy data blocks together into a stream of bytes
int dataBlocksCount = dataBlocks.Length;
for (int j = 0; j < dataBlocksCount; j++)
{
DataBlock dataBlock = dataBlocks[j];
byte[] codewordBytes = dataBlock.Codewords;
int numDataCodewords = dataBlock.NumDataCodewords;
if (!correctErrors(codewordBytes, numDataCodewords))
{
return(null);
}
for (int i = 0; i < numDataCodewords; i++)
{
// De-interlace data blocks.
resultBytes[i * dataBlocksCount + j] = codewordBytes[i];
}
}
// Decode the contents of that stream of bytes
return(DecodedBitStreamParser.decode(resultBytes));
}
/// <summary>
/// <p>Decodes a Data Matrix Code represented as a <see cref="BitMatrix" />. A 1 or "true" is taken
/// to mean a black module.</p>
/// </summary>
/// <param name="bits">booleans representing white/black Data Matrix Code modules</param>
/// <returns>text and bytes encoded within the Data Matrix Code</returns>
public DecoderResult decode(BitMatrix bits)
{
// Construct a parser and read version, error-correction level
BitMatrixParser parser = new BitMatrixParser(bits);
if (parser.Version == null)
return null;
// Read codewords
byte[] codewords = parser.readCodewords();
if (codewords == null)
return null;
// Separate into data blocks
DataBlock[] dataBlocks = DataBlock.getDataBlocks(codewords, parser.Version);
int dataBlocksCount = dataBlocks.Length;
// Count total number of data bytes
int totalBytes = 0;
foreach (var db in dataBlocks)
{
totalBytes += db.NumDataCodewords;
}
byte[] resultBytes = new byte[totalBytes];
// Error-correct and copy data blocks together into a stream of bytes
for (int j = 0; j < dataBlocksCount; j++)
{
DataBlock dataBlock = dataBlocks[j];
byte[] codewordBytes = dataBlock.Codewords;
int numDataCodewords = dataBlock.NumDataCodewords;
if (!correctErrors(codewordBytes, numDataCodewords))
return null;
for (int i = 0; i < numDataCodewords; i++)
{
// De-interlace data blocks.
resultBytes[i * dataBlocksCount + j] = codewordBytes[i];
}
}
// Decode the contents of that stream of bytes
return DecodedBitStreamParser.decode(resultBytes);
}
