/// <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 capacity = numDataBytes << 3; 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. for (int i = 0; i < 4 && bits.size() < capacity; ++i) { bits.appendBit(0); } int numBitsInLastByte = bits.size() % 8; // If the last byte isn't 8-bit aligned, we'll add padding bits. if (numBitsInLastByte > 0) { int numPaddingBits = 8 - numBitsInLastByte; for (int i = 0; i < numPaddingBits; ++i) { bits.appendBit(0); } } // Should be 8-bit aligned here. if (bits.size() % 8 != 0) { throw new WriterException("Number of bits is not a multiple of 8"); } // 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(); for (int i = 0; i < numPaddingBytes; ++i) { if (i % 2 == 0) { bits.appendBits(0xec, 8); } else { bits.appendBits(0x11, 8); } } if (bits.size() != capacity) { throw new WriterException("Bits size does not equal capacity"); } }
private static void appendECI(CharacterSetECI eci, BitVector bits) { bits.appendBits(Mode.ECI.Bits, 4); // This is correct for values up to 127, which is all we need now. bits.appendBits(eci.Value, 8); }
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++; } } }
/// <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 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.Generic.List<Object> blocks = new System.Collections.Generic.List<Object>(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. 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()) { result.appendBits(dataBytes.at(i), 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."); } }
/// <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); }
/// <summary> Append mode info. On success, store the result in "bits".</summary> internal static void appendModeInfo(Mode mode, BitVector bits) { bits.appendBits(mode.Bits, 4); }
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); } }
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++; } } }
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'" //Marauderz : Silverlight doesn't support too many encoding classes, switching this to UTF-8 //bytes = SupportClass.ToSByteArray(System.Text.Encoding.GetEncoding(encoding).GetBytes(content)); bytes = SupportClass.ToSByteArray(System.Text.Encoding.UTF8.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); } }
// Make bit vector of version information. On success, store the result in "bits" and return true. // See 8.10 of JISX0510:2004 (p.45) for details. public static void makeVersionInfoBits(int version, BitVector bits) { bits.appendBits(version, 6); int bchCode = calculateBCHCode(version, VERSION_INFO_POLY); bits.appendBits(bchCode, 12); if (bits.size() != 18) { // Just in case. throw new WriterException("should not happen but we got: " + bits.size()); } }
// 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. public static void makeTypeInfoBits(ErrorCorrectionLevel ecLevel, int maskPattern, BitVector bits) { if (!QRCode.isValidMaskPattern(maskPattern)) { throw new WriterException("Invalid mask pattern"); } int typeInfo = (ecLevel.Bits << 3) | 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()); } }