private void EncodeBlock(byte[] src, char[] dst, int beginInd, int endInd)
{
for (int ind = beginInd; ind < endInd; ind++)
{
int charInd = ind * (int)BlockCharsCount;
int bitInd = ind * BlockBitsCount;
ulong bits = GetBits64(src, bitInd, BlockBitsCount);
BitsToChars(dst, charInd, (int)BlockCharsCount, bits);
}
}