private FormatInformation(int formatInfo)
{
// Bits 3,4
errorCorrectionLevel = ErrorCorrectionLevel.forBits((formatInfo >> 3) & 0x03);
// Bottom 3 bits
_dataMask = (sbyte) (formatInfo & 0x07);
}
/// <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>
/// <returns> text and bytes encoded within the QR Code
/// </returns>
/// <throws> ReaderException if the QR Code cannot be decoded </throws>
public DecoderResult decode(BitMatrix bits)
{
// Construct a parser and read version, error-correction level
BitMatrixParser parser = new BitMatrixParser(bits);
Version version = parser.readVersion();
ErrorCorrectionLevel ecLevel = parser.readFormatInformation().ErrorCorrectionLevel;
// Read codewords
sbyte[] codewords = parser.readCodewords();
// Separate into data blocks
DataBlock[] dataBlocks = DataBlock.getDataBlocks(codewords, version, ecLevel);
// Count total number of data bytes
int totalBytes = 0;
for (int i = 0; i < dataBlocks.Length; i++)
{
totalBytes += dataBlocks[i].NumDataCodewords;
}
sbyte[] resultBytes = new sbyte[totalBytes];
int resultOffset = 0;
// Error-correct and copy data blocks together into a stream of bytes
for (int j = 0; j < dataBlocks.Length; j++)
{
DataBlock dataBlock = dataBlocks[j];
sbyte[] codewordBytes = dataBlock.Codewords;
int numDataCodewords = dataBlock.NumDataCodewords;
correctErrors(codewordBytes, numDataCodewords);
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));
}
public ECBlocks getECBlocksForLevel(ErrorCorrectionLevel ecLevel)
{
return _ecBlocks[ecLevel.Ordinal()];
}
/// <summary> <p>When QR Codes use multiple data blocks, they are actually interleaved.
/// 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.</p>
///
/// </summary>
/// <param name="rawCodewords">bytes as read directly from the QR Code
/// </param>
/// <param name="version">version of the QR Code
/// </param>
/// <param name="ecLevel">error-correction level of the QR Code
/// </param>
/// <returns> {@link DataBlock}s containing original bytes, "de-interleaved" from representation in the
/// QR Code
/// </returns>
internal static DataBlock[] getDataBlocks(sbyte[] rawCodewords, Version version, ErrorCorrectionLevel ecLevel)
{
if (rawCodewords.Length != version.TotalCodewords)
{
throw new System.ArgumentException();
}
// Figure out the number and size of data blocks used by this version and
// error correction level
Version.ECBlocks ecBlocks = version.getECBlocksForLevel(ecLevel);
// 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].Count;
}
// 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.Count; i++)
{
int numDataCodewords = ecBlock.DataCodewords;
int numBlockCodewords = ecBlocks.ECCodewordsPerBlock + numDataCodewords;
result[numResultBlocks++] = new DataBlock(numDataCodewords, new sbyte[numBlockCodewords]);
}
}
// All blocks have the same amount of data, except that the last n
// (where n may be 0) have 1 more byte. Figure out where these start.
int shorterBlocksTotalCodewords = result[0].codewords.Length;
int longerBlocksStartAt = result.Length - 1;
while (longerBlocksStartAt >= 0)
{
int numCodewords = result[longerBlocksStartAt].codewords.Length;
if (numCodewords == shorterBlocksTotalCodewords)
{
break;
}
longerBlocksStartAt--;
}
longerBlocksStartAt++;
int shorterBlocksNumDataCodewords = shorterBlocksTotalCodewords - ecBlocks.ECCodewordsPerBlock;
// The last elements of result may be 1 element longer;
// first fill out as many elements as all of them have
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
for (int j = longerBlocksStartAt; j < numResultBlocks; j++)
{
result[j].codewords[shorterBlocksNumDataCodewords] = rawCodewords[rawCodewordsOffset++];
}
// Now add in error correction blocks
int max = result[0].codewords.Length;
for (int i = shorterBlocksNumDataCodewords; i < max; i++)
{
for (int j = 0; j < numResultBlocks; j++)
{
int iOffset = j < longerBlocksStartAt?i:i + 1;
result[j].codewords[iOffset] = rawCodewords[rawCodewordsOffset++];
}
}
return(result);
}
internal static DecoderResult decode(sbyte[] bytes, Version version, ErrorCorrectionLevel ecLevel)
{
BitSource bits = new BitSource(bytes);
System.Text.StringBuilder result = new System.Text.StringBuilder(50);
CharacterSetECI currentCharacterSetECI = null;
bool fc1InEffect = false;
System.Collections.ArrayList byteSegments = System.Collections.ArrayList.Synchronized(new System.Collections.ArrayList(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 (System.ArgumentException)
{
throw ReaderException.Instance;
}
}
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_Renamed = parseECIValue(bits);
currentCharacterSetECI = CharacterSetECI.GetCharacterSetEciByValue(value_Renamed);
if (currentCharacterSetECI == null)
{
throw ReaderException.Instance;
}
}
else
{
// 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);
}
else if (mode.Equals(Mode.KANJI))
{
decodeKanjiSegment(bits, result, count);
}
else
{
throw ReaderException.Instance;
}
}
}
}
while (!mode.Equals(Mode.TERMINATOR));
return new DecoderResult(bytes, result.ToString(), (byteSegments.Count == 0)?null:byteSegments, ecLevel);
}
/// <summary> <p>When QR Codes use multiple data blocks, they are actually interleaved.
/// 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.</p>
///
/// </summary>
/// <param name="rawCodewords">bytes as read directly from the QR Code
/// </param>
/// <param name="version">version of the QR Code
/// </param>
/// <param name="ecLevel">error-correction level of the QR Code
/// </param>
/// <returns> {@link DataBlock}s containing original bytes, "de-interleaved" from representation in the
/// QR Code
/// </returns>
internal static DataBlock[] getDataBlocks(sbyte[] rawCodewords, Version version, ErrorCorrectionLevel ecLevel)
{
if (rawCodewords.Length != version.TotalCodewords)
{
throw new System.ArgumentException();
}
// Figure out the number and size of data blocks used by this version and
// error correction level
Version.ECBlocks ecBlocks = version.getECBlocksForLevel(ecLevel);
// 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].Count;
}
// 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.Count; i++)
{
int numDataCodewords = ecBlock.DataCodewords;
int numBlockCodewords = ecBlocks.ECCodewordsPerBlock + numDataCodewords;
result[numResultBlocks++] = new DataBlock(numDataCodewords, new sbyte[numBlockCodewords]);
}
}
// All blocks have the same amount of data, except that the last n
// (where n may be 0) have 1 more byte. Figure out where these start.
int shorterBlocksTotalCodewords = result[0].codewords.Length;
int longerBlocksStartAt = result.Length - 1;
while (longerBlocksStartAt >= 0)
{
int numCodewords = result[longerBlocksStartAt].codewords.Length;
if (numCodewords == shorterBlocksTotalCodewords)
{
break;
}
longerBlocksStartAt--;
}
longerBlocksStartAt++;
int shorterBlocksNumDataCodewords = shorterBlocksTotalCodewords - ecBlocks.ECCodewordsPerBlock;
// The last elements of result may be 1 element longer;
// first fill out as many elements as all of them have
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
for (int j = longerBlocksStartAt; j < numResultBlocks; j++)
{
result[j].codewords[shorterBlocksNumDataCodewords] = rawCodewords[rawCodewordsOffset++];
}
// Now add in error correction blocks
int max = result[0].codewords.Length;
for (int i = shorterBlocksNumDataCodewords; i < max; i++)
{
for (int j = 0; j < numResultBlocks; j++)
{
int iOffset = j < longerBlocksStartAt?i:i + 1;
result[j].codewords[iOffset] = rawCodewords[rawCodewordsOffset++];
}
}
return result;
}
internal static DecoderResult decode(sbyte[] bytes, Version version, ErrorCorrectionLevel ecLevel)
{
BitSource bits = new BitSource(bytes);
System.Text.StringBuilder result = new System.Text.StringBuilder(50);
CharacterSetECI currentCharacterSetECI = null;
bool fc1InEffect = false;
System.Collections.ArrayList byteSegments = System.Collections.ArrayList.Synchronized(new System.Collections.ArrayList(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 (System.ArgumentException)
{
throw ReaderException.Instance;
}
}
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_Renamed = parseECIValue(bits);
currentCharacterSetECI = CharacterSetECI.GetCharacterSetEciByValue(value_Renamed);
if (currentCharacterSetECI == null)
{
throw ReaderException.Instance;
}
}
else
{
// 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);
}
else if (mode.Equals(Mode.KANJI))
{
decodeKanjiSegment(bits, result, count);
}
else
{
throw ReaderException.Instance;
}
}
}
}while (!mode.Equals(Mode.TERMINATOR));
return(new DecoderResult(bytes, result.ToString(), (byteSegments.Count == 0)?null:byteSegments, ecLevel));
}
public ECBlocks getECBlocksForLevel(ErrorCorrectionLevel ecLevel)
{
return(_ecBlocks[ecLevel.Ordinal()]);
}
