| public appendBits ( int value_Renamed, int numBits ) : void | ||
| value_Renamed | int | |
| numBits | int | |
| Результат | void | |
internal static void appendKanjiBytes(String content, BitVector bits)
{
sbyte[] bytes;
try
{
bytes = SupportClass.ToSByteArray(Encoding.GetEncoding("Shift_JIS").GetBytes(content));
}
catch (IOException uee)
{
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);
}
}
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 appendAlphanumericBytes(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(String content, BitVector bits, String encoding)
{
sbyte[] bytes;
try
{
bytes = SupportClass.ToSByteArray(Encoding.GetEncoding(encoding).GetBytes(content));
}
catch (IOException uee)
{
throw new WriterException(uee.ToString());
}
for (int i = 0; i < bytes.Length; ++i)
{
bits.appendBits(bytes[i], 8);
}
}
/// <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);
}
internal static void appendNumericBytes(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> Append mode info. On success, store the result in "bits".</summary>
internal static void appendModeInfo(Mode mode, BitVector bits)
{
bits.appendBits(mode.Bits, 4);
}
/// <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.
var blocks = new List<BlockPair>(numRSBlocks);
for (int i = 0; i < numRSBlocks; ++i)
{
var numDataBytesInBlock = new int[1];
var numEcBytesInBlock = new int[1];
getNumDataBytesAndNumECBytesForBlockID(numTotalBytes, numDataBytes, numRSBlocks, i, numDataBytesInBlock,
numEcBytesInBlock);
var dataBytes = new ByteArray();
dataBytes.set_Renamed(bits.Array, dataBytesOffset, numDataBytesInBlock[0]);
ByteArray ecBytes = generateECBytes(dataBytes, numEcBytesInBlock[0]);
blocks.Add(new BlockPair(dataBytes, ecBytes));
maxNumDataBytes = Math.Max(maxNumDataBytes, dataBytes.size());
maxNumEcBytes = 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> 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");
}
}
// 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);
var 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());
}
}
