Beispiel #1
0
 /// <summary>  Encode "bytes" with the error correction level "ecLevel". The encoding mode will be chosen
 /// internally by chooseMode(). On success, store the result in "qrCode".
 ///
 /// We recommend you to use QRCode.EC_LEVEL_L (the lowest level) for
 /// "getECLevel" since our primary use is to show QR code on desktop screens. We don't need very
 /// strong error correction for this purpose.
 ///
 /// Note that there is no way to encode bytes in MODE_KANJI. We might want to add EncodeWithMode()
 /// with which clients can specify the encoding mode. For now, we don't need the functionality.
 /// </summary>
 public static void  Encode(System.String content, ErrorCorrectionLevel ecLevel, QRCode qrCode)
 {
     Encode(content, ecLevel, null, qrCode);
 }
Beispiel #2
0
        public static void  Encode(System.String content, ErrorCorrectionLevel ecLevel, System.Collections.Hashtable hints, QRCode qrCode)
        {
            System.String encoding = hints == null?null:(System.String)hints[EncodeHintType.CHARACTER_SET];
            if (encoding == null)
            {
                encoding = DEFAULT_BYTE_MODE_ENCODING;
            }

            // Step 1: Choose the mode (encoding).
            Mode mode = ChooseMode(content, encoding);

            // Step 2: Append "bytes" into "dataBits" in appropriate encoding.
            BitVector dataBits = new BitVector();

            appendBytes(content, mode, dataBits, encoding);
            // Step 3: Initialize QR code that can contain "dataBits".
            int numInputBytes = dataBits.sizeInBytes();

            InitQrCode(numInputBytes, ecLevel, mode, qrCode);

            // Step 4: Build another bit vector that contains header and data.
            BitVector headerAndDataBits = new BitVector();

            // Step 4.5: Append ECI message if applicable
            if (mode == Mode.BYTE && !DEFAULT_BYTE_MODE_ENCODING.Equals(encoding))
            {
                CharacterSetECI eci = CharacterSetECI.getCharacterSetECIByName(encoding);
                if (eci != null)
                {
                    AppendECI(eci, headerAndDataBits);
                }
            }

            appendModeInfo(mode, headerAndDataBits);

            int numLetters = mode.Equals(Mode.BYTE)?dataBits.sizeInBytes():content.Length;

            appendLengthInfo(numLetters, qrCode.Version, mode, headerAndDataBits);
            headerAndDataBits.appendBitVector(dataBits);

            // Step 5: Terminate the bits properly.
            TerminateBits(qrCode.NumDataBytes, headerAndDataBits);

            // Step 6: Interleave data bits with error correction code.
            BitVector finalBits = new BitVector();

            InterleaveWithEcBytes(headerAndDataBits, qrCode.NumTotalBytes, qrCode.NumDataBytes, qrCode.NumRSBlocks, finalBits);

            // Step 7: Choose the mask pattern and set to "qrCode".
            ByteMatrix matrix = new ByteMatrix(qrCode.MatrixWidth, qrCode.MatrixWidth);

            qrCode.MaskPattern = ChooseMaskPattern(finalBits, qrCode.ECLevel, qrCode.Version, matrix);

            // Step 8.  Build the matrix and set it to "qrCode".
            MatrixUtil.buildMatrix(finalBits, qrCode.ECLevel, qrCode.Version, qrCode.MaskPattern, matrix);
            qrCode.Matrix = matrix;
            // Step 9.  Make sure we have a valid QR Code.
            if (!qrCode.Valid)
            {
                throw new WriterException(string.Format("Invalid QR code: {0}", qrCode));
            }
        }
Beispiel #3
0
        /// <summary> Initialize "qrCode" according to "numInputBytes", "ecLevel", and "mode". On success,
        /// modify "qrCode".
        /// </summary>
        private static void  InitQrCode(int numInputBytes, ErrorCorrectionLevel ecLevel, Mode mode, QRCode qrCode)
        {
            qrCode.ECLevel = ecLevel;
            qrCode.Mode    = mode;

            // In the following comments, we use numbers of Version 7-H.
            for (int versionNum = 1; versionNum <= 40; versionNum++)
            {
                Version version = Version.getVersionForNumber(versionNum);
                // numBytes = 196
                int numBytes = version.TotalCodewords;
                // getNumECBytes = 130
                Version.ECBlocks ecBlocks = version.getECBlocksForLevel(ecLevel);
                int numEcBytes            = ecBlocks.TotalECCodewords;
                // getNumRSBlocks = 5
                int numRSBlocks = ecBlocks.NumBlocks;
                // getNumDataBytes = 196 - 130 = 66
                int numDataBytes = numBytes - numEcBytes;
                // We want to choose the smallest version which can contain data of "numInputBytes" + some
                // extra bits for the header (mode info and length info). The header can be three bytes
                // (precisely 4 + 16 bits) at most. Hence we do +3 here.
                if (numDataBytes >= numInputBytes + 3)
                {
                    // Yay, we found the proper rs block info!
                    qrCode.Version       = versionNum;
                    qrCode.NumTotalBytes = numBytes;
                    qrCode.NumDataBytes  = numDataBytes;
                    qrCode.NumRSBlocks   = numRSBlocks;
                    // getNumECBytes = 196 - 66 = 130
                    qrCode.NumECBytes = numEcBytes;
                    // matrix width = 21 + 6 * 4 = 45
                    qrCode.MatrixWidth = version.DimensionForVersion;
                    return;
                }
            }
            throw new WriterException("Cannot find proper rs block info (input data too big?)");
        }