Encapsulates a set of error-correction blocks in one symbol version. Most versions will use blocks of differing sizes within one version, so, this encapsulates the parameters for each set of blocks. It also holds the number of error-correction codewords per block since it will be the same across all blocks within one version.

Esempio n. 1
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 private static Version chooseVersion(int numInputBits, ErrorCorrectionLevel ecLevel)
 {
     // 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;
         // getNumDataBytes = 196 - 130 = 66
         int numDataBytes    = numBytes - numEcBytes;
         int totalInputBytes = (numInputBits + 7) / 8;
         if (numDataBytes >= totalInputBytes)
         {
             return(version);
         }
     }
     throw new WriterException("Data too big");
 }
Esempio n. 2
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        /// <summary>
        /// Encodes the specified content.
        /// </summary>
        /// <param name="content">The content.</param>
        /// <param name="ecLevel">The ec level.</param>
        /// <param name="hints">The hints.</param>
        /// <returns></returns>
        public static QRCode encode(String content,
                                    ErrorCorrectionLevel ecLevel,
                                    IDictionary <EncodeHintType, object> hints)
        {
            // Determine what character encoding has been specified by the caller, if any
#if !SILVERLIGHT || WINDOWS_PHONE
            String encoding = hints == null || !hints.ContainsKey(EncodeHintType.CHARACTER_SET) ? null : (String)hints[EncodeHintType.CHARACTER_SET];
            if (encoding == null)
            {
                encoding = DEFAULT_BYTE_MODE_ENCODING;
            }
            bool generateECI = !DEFAULT_BYTE_MODE_ENCODING.Equals(encoding);
#else
            // Silverlight supports only UTF-8 and UTF-16 out-of-the-box
            const string encoding = "UTF-8";
            // caller of the method can only control if the ECI segment should be written
            // character set is fixed to UTF-8; but some scanners doesn't like the ECI segment
            bool generateECI = (hints != null && hints.ContainsKey(EncodeHintType.CHARACTER_SET));
#endif
            // http://zxingnet.codeplex.com/discussions/399045
            if (hints != null && hints.ContainsKey(EncodeHintType.DISABLE_ECI) && (bool)hints[EncodeHintType.DISABLE_ECI])
            {
                generateECI = false;
            }

            // Pick an encoding mode appropriate for the content. Note that this will not attempt to use
            // multiple modes / segments even if that were more efficient. Twould be nice.
            Mode mode = chooseMode(content, encoding);

            // This will store the header information, like mode and
            // length, as well as "header" segments like an ECI segment.
            BitArray headerBits = new BitArray();

            // Append ECI segment if applicable
            if (mode == Mode.BYTE && generateECI)
            {
                CharacterSetECI eci = CharacterSetECI.getCharacterSetECIByName(encoding);
                if (eci != null)
                {
                    appendECI(eci, headerBits);
                }
            }

            // (With ECI in place,) Write the mode marker
            appendModeInfo(mode, headerBits);

            // Collect data within the main segment, separately, to count its size if needed. Don't add it to
            // main payload yet.
            BitArray dataBits = new BitArray();
            appendBytes(content, mode, dataBits, encoding);

            // Hard part: need to know version to know how many bits length takes. But need to know how many
            // bits it takes to know version. First we take a guess at version by assuming version will be
            // the minimum, 1:

            int provisionalBitsNeeded = headerBits.Size
                                        + mode.getCharacterCountBits(Version.getVersionForNumber(1))
                                        + dataBits.Size;
            Version provisionalVersion = chooseVersion(provisionalBitsNeeded, ecLevel);

            // Use that guess to calculate the right version. I am still not sure this works in 100% of cases.
            int bitsNeeded = headerBits.Size
                             + mode.getCharacterCountBits(provisionalVersion)
                             + dataBits.Size;
            Version version = chooseVersion(bitsNeeded, ecLevel);

            BitArray headerAndDataBits = new BitArray();
            headerAndDataBits.appendBitArray(headerBits);
            // Find "length" of main segment and write it
            int numLetters = mode == Mode.BYTE ? dataBits.SizeInBytes : content.Length;
            appendLengthInfo(numLetters, version, mode, headerAndDataBits);
            // Put data together into the overall payload
            headerAndDataBits.appendBitArray(dataBits);

            Version.ECBlocks ecBlocks = version.getECBlocksForLevel(ecLevel);
            int numDataBytes          = version.TotalCodewords - ecBlocks.TotalECCodewords;

            // Terminate the bits properly.
            terminateBits(numDataBytes, headerAndDataBits);

            // Interleave data bits with error correction code.
            BitArray finalBits = interleaveWithECBytes(headerAndDataBits,
                                                       version.TotalCodewords,
                                                       numDataBytes,
                                                       ecBlocks.NumBlocks);

            QRCode qrCode = new QRCode
            {
                ECLevel = ecLevel,
                Mode    = mode,
                Version = version
            };

            //  Choose the mask pattern and set to "qrCode".
            int        dimension   = version.DimensionForVersion;
            ByteMatrix matrix      = new ByteMatrix(dimension, dimension);
            int        maskPattern = chooseMaskPattern(finalBits, ecLevel, version, matrix);
            qrCode.MaskPattern = maskPattern;

            // Build the matrix and set it to "qrCode".
            MatrixUtil.buildMatrix(finalBits, ecLevel, version, maskPattern, matrix);
            qrCode.Matrix = matrix;

            return(qrCode);
        }
Esempio n. 3
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        public static QRCode encode(String content,
                                    ErrorCorrectionLevel ecLevel,
                                    IDictionary hints)
        {
            // Determine what character encoding has been specified by the caller, if any
            String encoding = hints == null || !hints.Contains(EncodeHintType.CHARACTER_SET) ? null : (String)hints[EncodeHintType.CHARACTER_SET];

            if (encoding == null)
            {
                encoding = DEFAULT_BYTE_MODE_ENCODING;
            }
            bool doSelectMask = hints == null || !hints.Contains(EncodeHintType.QR_DO_MASK_SELECTION) ? false : (bool)hints[EncodeHintType.QR_DO_MASK_SELECTION];

            // Pick an encoding mode appropriate for the content. Note that this will not attempt to use
            // multiple modes / segments even if that were more efficient. Twould be nice.
            Mode mode = chooseMode(content, encoding);

            // This will store the header information, like mode and
            // length, as well as "header" segments like an ECI segment.
            BitArray headerBits = new BitArray();

            // Append ECI segment if applicable
            if (mode == Mode.BYTE && !DEFAULT_BYTE_MODE_ENCODING.Equals(encoding))
            {
                CharacterSetECI eci = CharacterSetECI.getCharacterSetECIByName(encoding);
                if (eci != null)
                {
                    appendECI(eci, headerBits);
                }
            }

            // (With ECI in place,) Write the mode marker
            appendModeInfo(mode, headerBits);

            // Collect data within the main segment, separately, to count its size if needed. Don't add it to
            // main payload yet.
            BitArray dataBits = new BitArray();

            appendBytes(content, mode, dataBits, encoding);

            // Hard part: need to know version to know how many bits length takes. But need to know how many
            // bits it takes to know version. To pick version size assume length takes maximum bits
            int bitsNeeded = headerBits.Size
                             + mode.getCharacterCountBits(Version.getVersionForNumber(40))
                             + dataBits.Size;
            Version version = chooseVersion(bitsNeeded, ecLevel);

            BitArray headerAndDataBits = new BitArray();

            headerAndDataBits.appendBitArray(headerBits);
            // Find "length" of main segment and write it
            int numLetters = mode == Mode.BYTE ? dataBits.SizeInBytes : content.Length;

            appendLengthInfo(numLetters, version, mode, headerAndDataBits);
            // Put data together into the overall payload
            headerAndDataBits.appendBitArray(dataBits);

            Version.ECBlocks ecBlocks = version.getECBlocksForLevel(ecLevel);
            int numDataBytes          = version.TotalCodewords - ecBlocks.TotalECCodewords;

            // Terminate the bits properly.
            terminateBits(numDataBytes, headerAndDataBits);

            // Interleave data bits with error correction code.
            BitArray finalBits = interleaveWithECBytes(headerAndDataBits,
                                                       version.TotalCodewords,
                                                       numDataBytes,
                                                       ecBlocks.NumBlocks);

            QRCode qrCode = new QRCode
            {
                ECLevel = ecLevel,
                Mode    = mode,
                Version = version
            };

            //  Choose the mask pattern and set to "qrCode".
            int        dimension   = version.DimensionForVersion;
            ByteMatrix matrix      = new ByteMatrix(dimension, dimension);
            int        maskPattern = 3;

            if (doSelectMask)
            {
                maskPattern = chooseMaskPattern(finalBits, ecLevel, version, matrix);
            }
            qrCode.MaskPattern = maskPattern;

            // Build the matrix and set it to "qrCode".
            MatrixUtil.buildMatrix(finalBits, ecLevel, version, maskPattern, matrix);
            qrCode.Matrix = matrix;

            return(qrCode);
        }