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()]); }