/// <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");
}
}