Ejemplo n.º 1
0
        /// <summary>
        ///
        /// </summary>
        /// <param name="content"></param>
        /// <param name="bits"></param>
        internal static void appendAlphanumericBytes(System.String content, BitVector bits)
        {
            int length = content.Length;
            int i      = 0;

            while (i < length)
            {
                int code1 = getAlphanumericCode(content[i]);
                if (code1 == -1)
                {
                    throw new WriterException();
                }
                if (i + 1 < length)
                {
                    int code2 = getAlphanumericCode(content[i + 1]);
                    if (code2 == -1)
                    {
                        throw new WriterException();
                    }
                    // Encode two alphanumeric letters in 11 bits.
                    bits.appendBits(code1 * 45 + code2, 11);
                    i += 2;
                }
                else
                {
                    // Encode one alphanumeric letter in six bits.
                    bits.appendBits(code1, 6);
                    i++;
                }
            }
        }
Ejemplo n.º 2
0
        /// <summary>
        ///
        /// </summary>
        /// <param name="content"></param>
        /// <param name="bits"></param>
        internal static void appendNumericBytes(System.String content, BitVector bits)
        {
            int length = content.Length;
            int i      = 0;

            while (i < length)
            {
                int num1 = content[i] - '0';
                if (i + 2 < length)
                {
                    // Encode three numeric letters in ten bits.
                    int num2 = content[i + 1] - '0';
                    int num3 = content[i + 2] - '0';
                    bits.appendBits(num1 * 100 + num2 * 10 + num3, 10);
                    i += 3;
                }
                else if (i + 1 < length)
                {
                    // Encode two numeric letters in seven bits.
                    int num2 = content[i + 1] - '0';
                    bits.appendBits(num1 * 10 + num2, 7);
                    i += 2;
                }
                else
                {
                    // Encode one numeric letter in four bits.
                    bits.appendBits(num1, 4);
                    i++;
                }
            }
        }
Ejemplo n.º 3
0
        /// <summary> Append length info. On success, store the result in "bits".</summary>
        internal static void appendLengthInfo(int numLetters, int version, Mode mode, BitVector bits)
        {
            int numBits = mode.getCharacterCountBits(Version.getVersionForNumber(version));

            if (numLetters > ((1 << numBits) - 1))
            {
                throw new WriterException(numLetters + "is bigger than" + ((1 << numBits) - 1));
            }
            bits.appendBits(numLetters, numBits);
        }
Ejemplo n.º 4
0
        /// <summary>
        /// Make bit vector of type information. On success, store the result in "bits" and return true.
        /// Encode error correction level and mask pattern. See 8.9 of
        /// JISX0510:2004 (p.45) for details.
        /// </summary>
        /// <param name="ecLevel"></param>
        /// <param name="maskPattern"></param>
        /// <param name="bits"></param>
        /// <remarks>
        /// ISO/IEC 18004:2006(E)  6.9 Format information
        /// </remarks>
        public static void makeTypeInfoBits(ErrorCorrectionLevel ecLevel, int version, int maskPattern, BitVector bits)
        {
            if (!MicroQRCode.isValidMaskPattern(maskPattern))
            {
                throw new WriterException("Invalid mask pattern");
            }
            //ISO/IEC 18004:2006(E)  6.9 Format information
            //Symbol number 0:         000
            //Data mask pattern reference:       11
            //Data bits (symbol number, data mask pattern reference):  00011
            //BCH bits:           1101011001
            //Unmasked bit sequence:        000111101011001
            //Mask pattern for XOR operation:       100010001000101
            //Format information module pattern:      100101100011100
            int typeInfo = SYMBOL_NUMBERS_INFO[version - 1][ecLevel.ordinal()];

            if (typeInfo == -1)
            {
                throw new WriterException("Invalid Version&Level info");
            }

            typeInfo = (typeInfo << 2) | maskPattern;
            bits.appendBits(typeInfo, 5);

            int bchCode = calculateBCHCode(typeInfo, TYPE_INFO_POLY);

            bits.appendBits(bchCode, 10);

            BitVector maskBits = new BitVector();

            maskBits.appendBits(TYPE_INFO_MASK_PATTERN, 15);
            bits.xor(maskBits);

            if (bits.size() != 15)
            {
                // Just in case.
                throw new WriterException("should not happen but we got: " + bits.size());
            }
        }
Ejemplo n.º 5
0
 /// <summary>
 ///
 /// </summary>
 /// <param name="content"></param>
 /// <param name="bits"></param>
 /// <param name="encoding"></param>
 internal static void append8BitBytes(System.String content, BitVector bits, System.String encoding)
 {
     sbyte[] bytes;
     try
     {
         //UPGRADE_TODO: Method 'java.lang.String.getBytes' was converted to 'System.Text.Encoding.GetEncoding(string).GetBytes(string)' which has a different behavior. "ms-help://MS.VSCC.v80/dv_commoner/local/redirect.htm?index='!DefaultContextWindowIndex'&keyword='jlca1073_javalangStringgetBytes_javalangString'"
         bytes = SupportClass.ToSByteArray(System.Text.Encoding.GetEncoding(encoding).GetBytes(content));
     }
     catch (System.IO.IOException uee)
     {
         //UPGRADE_TODO: The equivalent in .NET for method 'java.lang.Throwable.toString' may return a different value. "ms-help://MS.VSCC.v80/dv_commoner/local/redirect.htm?index='!DefaultContextWindowIndex'&keyword='jlca1043'"
         throw new WriterException(uee.ToString());
     }
     for (int i = 0; i < bytes.Length; ++i)
     {
         bits.appendBits(bytes[i], 8);
     }
 }
Ejemplo n.º 6
0
        /// <summary>
        ///
        /// </summary>
        /// <param name="content"></param>
        /// <param name="bits"></param>
        internal static void appendKanjiBytes(System.String content, BitVector bits)
        {
            sbyte[] bytes;
            try
            {
                //UPGRADE_TODO: Method 'java.lang.String.getBytes' was converted to 'System.Text.Encoding.GetEncoding(string).GetBytes(string)' which has a different behavior. "ms-help://MS.VSCC.v80/dv_commoner/local/redirect.htm?index='!DefaultContextWindowIndex'&keyword='jlca1073_javalangStringgetBytes_javalangString'"
                bytes = SupportClass.ToSByteArray(System.Text.Encoding.GetEncoding("Shift_JIS").GetBytes(content));
            }
            catch (System.IO.IOException uee)
            {
                //UPGRADE_TODO: The equivalent in .NET for method 'java.lang.Throwable.toString' may return a different value. "ms-help://MS.VSCC.v80/dv_commoner/local/redirect.htm?index='!DefaultContextWindowIndex'&keyword='jlca1043'"
                throw new WriterException(uee.ToString());
            }
            int length = bytes.Length;

            for (int i = 0; i < length; i += 2)
            {
                int byte1      = bytes[i] & 0xFF;
                int byte2      = bytes[i + 1] & 0xFF;
                int code       = (byte1 << 8) | byte2;
                int subtracted = -1;
                if (code >= 0x8140 && code <= 0x9ffc)
                {
                    subtracted = code - 0x8140;
                }
                else if (code >= 0xe040 && code <= 0xebbf)
                {
                    subtracted = code - 0xc140;
                }
                if (subtracted == -1)
                {
                    throw new WriterException("Invalid byte sequence");
                }
                int encoded = ((subtracted >> 8) * 0xc0) + (subtracted & 0xff);
                bits.appendBits(encoded, 13);
            }
        }
Ejemplo n.º 7
0
 /// <summary> Append mode info. On success, store the result in "bits".</summary>
 internal static void appendModeInfo(Mode mode, BitVector bits, int versionNum)
 {
     bits.appendBits(mode.Bits, mode.getBitsLength(versionNum));
 }
Ejemplo n.º 8
0
        /// <summary> Interleave "bits" with corresponding error correction bytes. On success, store the result in
        /// "result". The interleave rule is complicated. See 8.6 of JISX0510:2004 (p.37) for details.
        /// </summary>
        internal static void interleaveWithECBytes(BitVector bits, int versionNum, int numTotalBytes, int numDataBytes, int numRSBlocks, BitVector result)
        {
            // "bits" must have "getNumDataBytes" bytes of data.
            if (bits.sizeInBytes() != numDataBytes)
            {
                throw new WriterException("Number of bits and data bytes does not match");
            }

            // Step 1.  Divide data bytes into blocks and generate error correction bytes for them. We'll
            // store the divided data bytes blocks and error correction bytes blocks into "blocks".
            int dataBytesOffset = 0;
            int maxNumDataBytes = 0;
            int maxNumEcBytes   = 0;

            // Since, we know the number of reedsolmon blocks, we can initialize the vector with the number.
            System.Collections.ArrayList blocks = System.Collections.ArrayList.Synchronized(new System.Collections.ArrayList(numRSBlocks));

            for (int i = 0; i < numRSBlocks; ++i)
            {
                int[] numDataBytesInBlock = new int[1];
                int[] numEcBytesInBlock   = new int[1];
                getNumDataBytesAndNumECBytesForBlockID(numTotalBytes, numDataBytes, numRSBlocks, i, numDataBytesInBlock, numEcBytesInBlock);

                ByteArray dataBytes = new ByteArray();
                dataBytes.set_Renamed(bits.Array, dataBytesOffset, numDataBytesInBlock[0]);
                ByteArray ecBytes = generateECBytes(dataBytes, numEcBytesInBlock[0]);
                blocks.Add(new BlockPair(dataBytes, ecBytes));

                maxNumDataBytes  = System.Math.Max(maxNumDataBytes, dataBytes.size());
                maxNumEcBytes    = System.Math.Max(maxNumEcBytes, ecBytes.size());
                dataBytesOffset += numDataBytesInBlock[0];
            }
            if (numDataBytes != dataBytesOffset)
            {
                throw new WriterException("Data bytes does not match offset");
            }

            // First, place data blocks.
            var bitLen = bits.size();

            for (int i = 0; i < maxNumDataBytes; ++i)
            {
                for (int j = 0; j < blocks.Count; ++j)
                {
                    ByteArray dataBytes = ((BlockPair)blocks[j]).DataBytes;
                    if (i < dataBytes.size())
                    {
                        if (bitLen == 4)
                        {
                            result.appendBits(dataBytes.at(i) >> 4, 4);
                        }
                        else
                        {
                            result.appendBits(dataBytes.at(i), 8);
                        }
                    }
                }
                bitLen -= 8;
            }

            // Then, place error correction blocks.
            for (int i = 0; i < maxNumEcBytes; ++i)
            {
                for (int j = 0; j < blocks.Count; ++j)
                {
                    ByteArray ecBytes = ((BlockPair)blocks[j]).ErrorCorrectionBytes;
                    if (i < ecBytes.size())
                    {
                        result.appendBits(ecBytes.at(i), 8);
                    }
                }
            }
            if (numTotalBytes != result.sizeInBytes())
            {
                // Should be same.
                throw new WriterException("Interleaving error: " + numTotalBytes + " and " + result.sizeInBytes() + " differ.");
            }
        }
Ejemplo n.º 9
0
        /// <summary> Terminate bits as described in 8.4.8 and 8.4.9 of JISX0510:2004 (p.24).</summary>
        internal static void terminateBits(int numDataBytes, BitVector bits, int versionNum)
        {
            int capacity = numDataBytes << 3;
            //ISO/IEC 18004:2006(E) 6.4.10 Bit stream to codeword conversion
            //All codewords are 8 bits in length, except for the final data symbol character in Micro
            //QR Code versions M1 and M3 symbols, which is 4 bits in length
            int bitLen = (versionNum == 1 || versionNum == 3) ? 4 : 8;

            if (bitLen == 4)
            {
                capacity -= 4;
            }

            if (bits.size() > capacity)
            {
                throw new WriterException("data bits cannot fit in the QR Code" + bits.size() + " > " + capacity);
            }
            // Append termination bits. See 8.4.8 of JISX0510:2004 (p.24) for details.
            // TODO: srowen says we can remove this for loop, since the 4 terminator bits are optional if
            // the last byte has less than 4 bits left. So it amounts to padding the last byte with zeroes
            // either way.
            var terminatorMode = Mode.TERMINATOR;
            var ctLen          = terminatorMode.getBitsLength(versionNum);

            for (int i = 0; i < ctLen && bits.size() < capacity; ++i)
            {
                bits.appendBit(0);
            }

            int numBitsInLastByte = bits.size() % bitLen;

            // If the last byte isn't 8-bit aligned, we'll add padding bits.
            if (numBitsInLastByte > 0)
            {
                int numPaddingBits = bitLen - numBitsInLastByte;
                for (int i = 0; i < numPaddingBits; ++i)
                {
                    bits.appendBit(0);
                }
            }

            // Should be 8-bit aligned here.
            if (bits.size() % bitLen != 0)
            {
                throw new WriterException("Number of bits is not a multiple of 8");
            }

            //ISO/IEC 18004:2006(E) 6.4.10 Bit stream to codeword conversion
            //The message bit stream shall then be
            //extended to fill the data capacity of the symbol corresponding to the Version and Error Correction Level, as
            //defined in Table 8, by adding the Pad Codewords 11101100 and 00010001 alternately.

            // If we have more space, we'll fill the space with padding patterns defined in 8.4.9 (p.24).
            int numPaddingBytes = numDataBytes - bits.sizeInBytes();

            while (numPaddingBytes * 8 > (capacity - bits.size()) && numPaddingBytes > 0)
            {
                numPaddingBytes--;
            }

            for (int i = 0; i < numPaddingBytes; ++i)
            {
                if (i % 2 == 0)
                {
                    bits.appendBits(0xec, 8); //11101100
                }
                else
                {
                    bits.appendBits(0x11, 8);//00010001
                }
            }
            //For Micro QR Code versions M1 and M3 symbols, the final data codeword is 4 bits long.  The Pad Codeword used in the final data
            //symbol character position in Micro QR Code versions M1 and M3 symbols shall be represented as 0000.
            if (bitLen == 4 && bits.size() < capacity)
            {
                bits.appendBits(0x0, 4);//0000
            }
            if (bits.size() != capacity)
            {
                throw new WriterException("Bits size does not equal capacity");
            }
        }
Ejemplo n.º 10
0
        /// <summary> Interleave "bits" with corresponding error correction bytes. On success, store the result in
        /// "result". The interleave rule is complicated. See 8.6 of JISX0510:2004 (p.37) for details.
        /// </summary>
        internal static void interleaveWithECBytes(BitVector bits, int versionNum, int numTotalBytes, int numDataBytes, int numRSBlocks, BitVector result)
        {
            // "bits" must have "getNumDataBytes" bytes of data.
            if (bits.sizeInBytes() != numDataBytes)
            {
                throw new WriterException("Number of bits and data bytes does not match");
            }

            // Step 1.  Divide data bytes into blocks and generate error correction bytes for them. We'll
            // store the divided data bytes blocks and error correction bytes blocks into "blocks".
            int dataBytesOffset = 0;
            int maxNumDataBytes = 0;
            int maxNumEcBytes = 0;

            // Since, we know the number of reedsolmon blocks, we can initialize the vector with the number.
            System.Collections.ArrayList blocks = System.Collections.ArrayList.Synchronized(new System.Collections.ArrayList(numRSBlocks));

            for (int i = 0; i < numRSBlocks; ++i)
            {
                int[] numDataBytesInBlock = new int[1];
                int[] numEcBytesInBlock = new int[1];
                getNumDataBytesAndNumECBytesForBlockID(numTotalBytes, numDataBytes, numRSBlocks, i, numDataBytesInBlock, numEcBytesInBlock);

                ByteArray dataBytes = new ByteArray();
                dataBytes.set_Renamed(bits.Array, dataBytesOffset, numDataBytesInBlock[0]);
                ByteArray ecBytes = generateECBytes(dataBytes, numEcBytesInBlock[0]);
                blocks.Add(new BlockPair(dataBytes, ecBytes));

                maxNumDataBytes = System.Math.Max(maxNumDataBytes, dataBytes.size());
                maxNumEcBytes = System.Math.Max(maxNumEcBytes, ecBytes.size());
                dataBytesOffset += numDataBytesInBlock[0];
            }
            if (numDataBytes != dataBytesOffset)
            {
                throw new WriterException("Data bytes does not match offset");
            }

            // First, place data blocks.
            var bitLen = bits.size();
            for (int i = 0; i < maxNumDataBytes; ++i)
            {
                for (int j = 0; j < blocks.Count; ++j)
                {
                    ByteArray dataBytes = ((BlockPair)blocks[j]).DataBytes;
                    if (i < dataBytes.size())
                    {
                        if (bitLen == 4)
                            result.appendBits(dataBytes.at(i) >> 4, 4);
                        else
                            result.appendBits(dataBytes.at(i), 8);
                    }
                }
                bitLen -= 8;
            }

            // Then, place error correction blocks.
            for (int i = 0; i < maxNumEcBytes; ++i)
            {
                for (int j = 0; j < blocks.Count; ++j)
                {
                    ByteArray ecBytes = ((BlockPair)blocks[j]).ErrorCorrectionBytes;
                    if (i < ecBytes.size())
                    {
                        result.appendBits(ecBytes.at(i), 8);
                    }
                }
            }
            if (numTotalBytes != result.sizeInBytes())
            {
                // Should be same.
                throw new WriterException("Interleaving error: " + numTotalBytes + " and " + result.sizeInBytes() + " differ.");
            }
        }
Ejemplo n.º 11
0
 /// <summary>
 /// 
 /// </summary>
 /// <param name="content"></param>
 /// <param name="bits"></param>
 internal static void appendNumericBytes(System.String content, BitVector bits)
 {
     int length = content.Length;
     int i = 0;
     while (i < length)
     {
         int num1 = content[i] - '0';
         if (i + 2 < length)
         {
             // Encode three numeric letters in ten bits.
             int num2 = content[i + 1] - '0';
             int num3 = content[i + 2] - '0';
             bits.appendBits(num1 * 100 + num2 * 10 + num3, 10);
             i += 3;
         }
         else if (i + 1 < length)
         {
             // Encode two numeric letters in seven bits.
             int num2 = content[i + 1] - '0';
             bits.appendBits(num1 * 10 + num2, 7);
             i += 2;
         }
         else
         {
             // Encode one numeric letter in four bits.
             bits.appendBits(num1, 4);
             i++;
         }
     }
 }
Ejemplo n.º 12
0
 /// <summary> Append mode info. On success, store the result in "bits".</summary>
 internal static void appendModeInfo(Mode mode, BitVector bits, int versionNum)
 {
     bits.appendBits(mode.Bits, mode.getBitsLength(versionNum));
 }
Ejemplo n.º 13
0
 /// <summary> Append length info. On success, store the result in "bits".</summary>
 internal static void appendLengthInfo(int numLetters, int version, Mode mode, BitVector bits)
 {
     int numBits = mode.getCharacterCountBits(Version.getVersionForNumber(version));
     if (numLetters > ((1 << numBits) - 1))
     {
         throw new WriterException(numLetters + "is bigger than" + ((1 << numBits) - 1));
     }
     bits.appendBits(numLetters, numBits);
 }
Ejemplo n.º 14
0
 /// <summary>
 /// 
 /// </summary>
 /// <param name="content"></param>
 /// <param name="bits"></param>
 internal static void appendKanjiBytes(System.String content, BitVector bits)
 {
     sbyte[] bytes;
     try
     {
         //UPGRADE_TODO: Method 'java.lang.String.getBytes' was converted to 'System.Text.Encoding.GetEncoding(string).GetBytes(string)' which has a different behavior. "ms-help://MS.VSCC.v80/dv_commoner/local/redirect.htm?index='!DefaultContextWindowIndex'&keyword='jlca1073_javalangStringgetBytes_javalangString'"
         bytes = SupportClass.ToSByteArray(System.Text.Encoding.GetEncoding("Shift_JIS").GetBytes(content));
     }
     catch (System.IO.IOException uee)
     {
         //UPGRADE_TODO: The equivalent in .NET for method 'java.lang.Throwable.toString' may return a different value. "ms-help://MS.VSCC.v80/dv_commoner/local/redirect.htm?index='!DefaultContextWindowIndex'&keyword='jlca1043'"
         throw new WriterException(uee.ToString());
     }
     int length = bytes.Length;
     for (int i = 0; i < length; i += 2)
     {
         int byte1 = bytes[i] & 0xFF;
         int byte2 = bytes[i + 1] & 0xFF;
         int code = (byte1 << 8) | byte2;
         int subtracted = -1;
         if (code >= 0x8140 && code <= 0x9ffc)
         {
             subtracted = code - 0x8140;
         }
         else if (code >= 0xe040 && code <= 0xebbf)
         {
             subtracted = code - 0xc140;
         }
         if (subtracted == -1)
         {
             throw new WriterException("Invalid byte sequence");
         }
         int encoded = ((subtracted >> 8) * 0xc0) + (subtracted & 0xff);
         bits.appendBits(encoded, 13);
     }
 }
Ejemplo n.º 15
0
 /// <summary>
 /// 
 /// </summary>
 /// <param name="content"></param>
 /// <param name="bits"></param>
 internal static void appendAlphanumericBytes(System.String content, BitVector bits)
 {
     int length = content.Length;
     int i = 0;
     while (i < length)
     {
         int code1 = getAlphanumericCode(content[i]);
         if (code1 == -1)
         {
             throw new WriterException();
         }
         if (i + 1 < length)
         {
             int code2 = getAlphanumericCode(content[i + 1]);
             if (code2 == -1)
             {
                 throw new WriterException();
             }
             // Encode two alphanumeric letters in 11 bits.
             bits.appendBits(code1 * 45 + code2, 11);
             i += 2;
         }
         else
         {
             // Encode one alphanumeric letter in six bits.
             bits.appendBits(code1, 6);
             i++;
         }
     }
 }
Ejemplo n.º 16
0
 /// <summary>
 /// 
 /// </summary>
 /// <param name="content"></param>
 /// <param name="bits"></param>
 /// <param name="encoding"></param>
 internal static void append8BitBytes(System.String content, BitVector bits, System.String encoding)
 {
     sbyte[] bytes;
     try
     {
         //UPGRADE_TODO: Method 'java.lang.String.getBytes' was converted to 'System.Text.Encoding.GetEncoding(string).GetBytes(string)' which has a different behavior. "ms-help://MS.VSCC.v80/dv_commoner/local/redirect.htm?index='!DefaultContextWindowIndex'&keyword='jlca1073_javalangStringgetBytes_javalangString'"
         bytes = SupportClass.ToSByteArray(System.Text.Encoding.GetEncoding(encoding).GetBytes(content));
     }
     catch (System.IO.IOException uee)
     {
         //UPGRADE_TODO: The equivalent in .NET for method 'java.lang.Throwable.toString' may return a different value. "ms-help://MS.VSCC.v80/dv_commoner/local/redirect.htm?index='!DefaultContextWindowIndex'&keyword='jlca1043'"
         throw new WriterException(uee.ToString());
     }
     for (int i = 0; i < bytes.Length; ++i)
     {
         bits.appendBits(bytes[i], 8);
     }
 }
Ejemplo n.º 17
0
        /// <summary> Terminate bits as described in 8.4.8 and 8.4.9 of JISX0510:2004 (p.24).</summary>
        internal static void terminateBits(int numDataBytes, BitVector bits, int versionNum)
        {
            int capacity = numDataBytes << 3;
            //ISO/IEC 18004:2006(E) 6.4.10 Bit stream to codeword conversion
            //All codewords are 8 bits in length, except for the final data symbol character in Micro
            //QR Code versions M1 and M3 symbols, which is 4 bits in length
            int bitLen = (versionNum == 1 || versionNum == 3) ? 4 : 8;
            if (bitLen == 4)
                capacity -= 4;

            if (bits.size() > capacity)
            {
                throw new WriterException("data bits cannot fit in the QR Code" + bits.size() + " > " + capacity);
            }
            // Append termination bits. See 8.4.8 of JISX0510:2004 (p.24) for details.
            // TODO: srowen says we can remove this for loop, since the 4 terminator bits are optional if
            // the last byte has less than 4 bits left. So it amounts to padding the last byte with zeroes
            // either way.
            var terminatorMode = Mode.TERMINATOR;
            var ctLen = terminatorMode.getBitsLength(versionNum);
            for (int i = 0; i < ctLen && bits.size() < capacity; ++i)
            {
                bits.appendBit(0);
            }

            int numBitsInLastByte = bits.size() % bitLen;
            // If the last byte isn't 8-bit aligned, we'll add padding bits.
            if (numBitsInLastByte > 0)
            {
                int numPaddingBits = bitLen - numBitsInLastByte;
                for (int i = 0; i < numPaddingBits; ++i)
                {
                    bits.appendBit(0);
                }
            }

            // Should be 8-bit aligned here.
            if (bits.size() % bitLen != 0)
            {
                throw new WriterException("Number of bits is not a multiple of 8");
            }

            //ISO/IEC 18004:2006(E) 6.4.10 Bit stream to codeword conversion
            //The message bit stream shall then be
            //extended to fill the data capacity of the symbol corresponding to the Version and Error Correction Level, as
            //defined in Table 8, by adding the Pad Codewords 11101100 and 00010001 alternately.

            // If we have more space, we'll fill the space with padding patterns defined in 8.4.9 (p.24).
            int numPaddingBytes = numDataBytes - bits.sizeInBytes();
            while (numPaddingBytes * 8 > (capacity - bits.size()) && numPaddingBytes > 0)
                numPaddingBytes--;

            for (int i = 0; i < numPaddingBytes; ++i)
            {
                if (i % 2 == 0)
                {
                    bits.appendBits(0xec, 8); //11101100
                }
                else
                {
                    bits.appendBits(0x11, 8);//00010001
                }
            }
            //For Micro QR Code versions M1 and M3 symbols, the final data codeword is 4 bits long.  The Pad Codeword used in the final data
            //symbol character position in Micro QR Code versions M1 and M3 symbols shall be represented as 0000.
            if (bitLen == 4 && bits.size() < capacity)
                bits.appendBits(0x0, 4);//0000

            if (bits.size() != capacity)
            {
                throw new WriterException("Bits size does not equal capacity");
            }
        }
Ejemplo n.º 18
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        /// <summary>
        /// Make bit vector of type information. On success, store the result in "bits" and return true.
        /// Encode error correction level and mask pattern. See 8.9 of
        /// JISX0510:2004 (p.45) for details.
        /// </summary>
        /// <param name="ecLevel"></param>
        /// <param name="maskPattern"></param>
        /// <param name="bits"></param>
        /// <remarks>
        /// ISO/IEC 18004:2006(E)  6.9 Format information 
        /// </remarks>
        public static void makeTypeInfoBits(ErrorCorrectionLevel ecLevel, int version, int maskPattern, BitVector bits)
        {
            if (!MicroQRCode.isValidMaskPattern(maskPattern))
            {
                throw new WriterException("Invalid mask pattern");
            }
            //ISO/IEC 18004:2006(E)  6.9 Format information
            //Symbol number 0:         000
            //Data mask pattern reference:       11
            //Data bits (symbol number, data mask pattern reference):  00011
            //BCH bits:           1101011001
            //Unmasked bit sequence:        000111101011001
            //Mask pattern for XOR operation:       100010001000101
            //Format information module pattern:      100101100011100
            int typeInfo = SYMBOL_NUMBERS_INFO[version - 1][ecLevel.ordinal()];
            if (typeInfo == -1)
                throw new WriterException("Invalid Version&Level info");

            typeInfo = (typeInfo << 2) | maskPattern;
            bits.appendBits(typeInfo, 5);

            int bchCode = calculateBCHCode(typeInfo, TYPE_INFO_POLY);
            bits.appendBits(bchCode, 10);

            BitVector maskBits = new BitVector();
            maskBits.appendBits(TYPE_INFO_MASK_PATTERN, 15);
            bits.xor(maskBits);

            if (bits.size() != 15)
            {
                // Just in case.
                throw new WriterException("should not happen but we got: " + bits.size());
            }
        }