public void testAppendBit()
{
BitArray v = new BitArray();
Assert.AreEqual(0, v.SizeInBytes);
// 1
v.appendBit(true);
Assert.AreEqual(1, v.Size);
Assert.AreEqual(0x80000000L, getUnsignedInt(v, 0));
// 10
v.appendBit(false);
Assert.AreEqual(2, v.Size);
Assert.AreEqual(0x80000000L, getUnsignedInt(v, 0));
// 101
v.appendBit(true);
Assert.AreEqual(3, v.Size);
Assert.AreEqual(0xa0000000L, getUnsignedInt(v, 0));
// 1010
v.appendBit(false);
Assert.AreEqual(4, v.Size);
Assert.AreEqual(0xa0000000L, getUnsignedInt(v, 0));
// 10101
v.appendBit(true);
Assert.AreEqual(5, v.Size);
Assert.AreEqual(0xa8000000L, getUnsignedInt(v, 0));
// 101010
v.appendBit(false);
Assert.AreEqual(6, v.Size);
Assert.AreEqual(0xa8000000L, getUnsignedInt(v, 0));
// 1010101
v.appendBit(true);
Assert.AreEqual(7, v.Size);
Assert.AreEqual(0xaa000000L, getUnsignedInt(v, 0));
// 10101010
v.appendBit(false);
Assert.AreEqual(8, v.Size);
Assert.AreEqual(0xaa000000L, getUnsignedInt(v, 0));
// 10101010 1
v.appendBit(true);
Assert.AreEqual(9, v.Size);
Assert.AreEqual(0xaa800000L, getUnsignedInt(v, 0));
// 10101010 10
v.appendBit(false);
Assert.AreEqual(10, v.Size);
Assert.AreEqual(0xaa800000L, getUnsignedInt(v, 0));
}
/// <summary>
/// Terminate bits as described in 8.4.8 and 8.4.9 of JISX0510:2004 (p.24).
/// </summary>
/// <param name="numDataBytes">The num data bytes.</param>
/// <param name="bits">The bits.</param>
internal static void terminateBits(int numDataBytes, BitArray bits)
{
int capacity = numDataBytes << 3;
if (bits.Size > capacity)
{
throw new WriterException("data bits cannot fit in the QR Code" + bits.Size + " > " +
capacity);
}
for (int i = 0; i < 4 && bits.Size < capacity; ++i)
{
bits.appendBit(false);
}
// Append termination bits. See 8.4.8 of JISX0510:2004 (p.24) for details.
// If the last byte isn't 8-bit aligned, we'll add padding bits.
int numBitsInLastByte = bits.Size & 0x07;
if (numBitsInLastByte > 0)
{
for (int i = numBitsInLastByte; i < 8; i++)
{
bits.appendBit(false);
}
}
// 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)
{
bits.appendBits((i & 0x01) == 0 ? 0xEC : 0x11, 8);
}
if (bits.Size != capacity)
{
throw new WriterException("Bits size does not equal capacity");
}
}
private static BitArray toBitArray(string bits)
{
var @in = new BitArray();
var str = DOTX.Replace(bits, "");
foreach (char aStr in str)
{
@in.appendBit(aStr == 'X');
}
return @in;
}
public static byte[] Encode(byte[] Content, int Width, int Height)
{
var ecLevel = ErrorCorrectionLevel.L;
var bits = new BitArray();
var mode = Mode.BYTE;
var bitsNeeded = 4 +
mode.getCharacterCountBits(ZXing.QrCode.Internal.Version.getVersionForNumber(1)) +
(Content.Length * 8);
var version = ChooseVersion(bitsNeeded, out ecLevel);
var ecBlocks = version.getECBlocksForLevel(ecLevel);
var totalByteCapacity = version.TotalCodewords - ecBlocks.TotalECCodewords;
var totalBitCapacity = totalByteCapacity << 3;
// Write the mode marker (BYTE)
bits.appendBits(mode.Bits, 4);
// Write the number of bytes
bits.appendBits(Content.Length, mode.getCharacterCountBits(version));
// Write the bytes
for (int i = 0; i < Content.Length; i++)
{
bits.appendBits(Content[i], 8);
}
// Terminate the bit stream
// - Write Termination Mode if space
for (int i = 0; i < 4 && bits.Size < totalBitCapacity; ++i)
{
bits.appendBit(false);
}
// Add 8-bit alignment padding
var bitsInLastByte = bits.Size & 0x07;
if (bitsInLastByte > 0)
{
for (int i = bitsInLastByte; i < 8; i++)
{
bits.appendBit(false);
}
}
// Fill remain space with padding patterns
var paddingBytes = totalByteCapacity - bits.SizeInBytes;
for (int i = 0; i < paddingBytes; ++i)
{
bits.appendBits((i & 0x01) == 0 ? 0xEC : 0x11, 8);
}
// Interleave data bits with error correction code.
var finalBits = interleaveWithECBytes(bits, version.TotalCodewords, totalByteCapacity, ecBlocks.NumBlocks);
// 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);
// Build the matrix and set it to "qrCode".
MatrixUtil.buildMatrix(finalBits, ecLevel, version, maskPattern, matrix);
// Render matrix to bytes
return scaleMatrix(matrix.Array, Width, Height);
}
public void testNumBytes()
{
BitArray v = new BitArray();
Assert.AreEqual(0, v.SizeInBytes);
v.appendBit(false);
// 1 bit was added in the vector, so 1 byte should be consumed.
Assert.AreEqual(1, v.SizeInBytes);
v.appendBits(0, 7);
Assert.AreEqual(1, v.SizeInBytes);
v.appendBits(0, 8);
Assert.AreEqual(2, v.SizeInBytes);
v.appendBits(0, 1);
// We now have 17 bits, so 3 bytes should be consumed.
Assert.AreEqual(3, v.SizeInBytes);
}
internal static BitArray stuffBits(BitArray bits, int wordSize)
{
var @out = new BitArray();
// 1. stuff the bits
int n = bits.Size;
int mask = (1 << wordSize) - 2;
for (int i = 0; i < n; i += wordSize)
{
int word = 0;
for (int j = 0; j < wordSize; j++)
{
if (i + j >= n || bits[i + j])
{
word |= 1 << (wordSize - 1 - j);
}
}
if ((word & mask) == mask)
{
@out.appendBits(word & mask, wordSize);
i--;
}
else if ((word & mask) == 0)
{
@out.appendBits(word | 1, wordSize);
i--;
}
else
{
@out.appendBits(word, wordSize);
}
}
// 2. pad last word to wordSize
n = @out.Size;
int remainder = n % wordSize;
if (remainder != 0)
{
int j = 1;
for (int i = 0; i < remainder; i++)
{
if (!@out[n - 1 - i])
{
j = 0;
}
}
for (int i = remainder; i < wordSize - 1; i++)
{
@out.appendBit(true);
}
@out.appendBit(j == 0);
}
return @out;
}
private static BitArray generateCheckWords(BitArray stuffedBits, int totalSymbolBits, int wordSize)
{
var messageSizeInWords = (stuffedBits.Size + wordSize - 1) / wordSize;
for (var i = messageSizeInWords * wordSize - stuffedBits.Size; i > 0; i--)
{
stuffedBits.appendBit(true);
}
var rs = new ReedSolomonEncoder(getGF(wordSize));
var totalSizeInFullWords = totalSymbolBits / wordSize;
var messageWords = bitsToWords(stuffedBits, wordSize, totalSizeInFullWords);
rs.encode(messageWords, totalSizeInFullWords - messageSizeInWords);
var startPad = totalSymbolBits % wordSize;
var messageBits = new BitArray();
messageBits.appendBits(0, startPad);
foreach (var messageWord in messageWords)
{
messageBits.appendBits(messageWord, wordSize);
}
return messageBits;
}
