/// <summary>
/// <p>Decodes a QR Code represented as a {@link BitMatrix}. A 1 or "true" is taken to mean a black module.</p>
/// </summary>
/// <param name="bits">booleans representing white/black QR Code modules</param>
/// <param name="hints">The hints.</param>
/// <returns>
/// text and bytes encoded within the QR Code
/// </returns>
public DecoderResult decode(BitMatrix bits, IDictionary <DecodeHintType, object> hints)
{
// Construct a parser and read version, error-correction level
BitMatrixParser parser = BitMatrixParser.createBitMatrixParser(bits);
if (parser == null)
{
return(null);
}
Version version = parser.readVersion();
if (version == null)
{
return(null);
}
var formatinfo = parser.readFormatInformation();
if (formatinfo == null)
{
return(null);
}
ErrorCorrectionLevel ecLevel = formatinfo.ErrorCorrectionLevel;
// Read codewords
byte[] codewords = parser.readCodewords();
if (codewords == null)
{
return(null);
}
// Separate into data blocks
DataBlock[] dataBlocks = DataBlock.getDataBlocks(codewords, version, ecLevel);
// Count total number of data bytes
int totalBytes = 0;
foreach (var dataBlock in dataBlocks)
{
totalBytes += dataBlock.NumDataCodewords;
}
byte[] resultBytes = new byte[totalBytes];
int resultOffset = 0;
// Error-correct and copy data blocks together into a stream of bytes
foreach (var dataBlock in dataBlocks)
{
byte[] codewordBytes = dataBlock.Codewords;
int numDataCodewords = dataBlock.NumDataCodewords;
if (!correctErrors(codewordBytes, numDataCodewords))
{
return(null);
}
for (int i = 0; i < numDataCodewords; i++)
{
resultBytes[resultOffset++] = codewordBytes[i];
}
}
// Decode the contents of that stream of bytes
return(DecodedBitStreamParser.decode(resultBytes, version, ecLevel, hints));
}
private DecoderResult decode(BitMatrixParser parser, IDictionary<DecodeHintType, object> hints)
{
Version version = parser.readVersion();
if (version == null)
return null;
var formatinfo = parser.readFormatInformation();
if (formatinfo == null)
return null;
ErrorCorrectionLevel ecLevel = formatinfo.ErrorCorrectionLevel;
// Read codewords
byte[] codewords = parser.readCodewords();
if (codewords == null)
return null;
// Separate into data blocks
DataBlock[] dataBlocks = DataBlock.getDataBlocks(codewords, version, ecLevel);
// Count total number of data bytes
int totalBytes = 0;
foreach (var dataBlock in dataBlocks)
{
totalBytes += dataBlock.NumDataCodewords;
}
byte[] resultBytes = new byte[totalBytes];
int resultOffset = 0;
// Error-correct and copy data blocks together into a stream of bytes
foreach (var dataBlock in dataBlocks)
{
byte[] codewordBytes = dataBlock.Codewords;
int numDataCodewords = dataBlock.NumDataCodewords;
if (!correctErrors(codewordBytes, numDataCodewords))
return null;
for (int i = 0; i < numDataCodewords; i++)
{
resultBytes[resultOffset++] = codewordBytes[i];
}
}
// Decode the contents of that stream of bytes
return DecodedBitStreamParser.decode(resultBytes, version, ecLevel, hints);
}