private static char[] EncodeBlock(ulong imprinted, int size)
{
var parameters = new ArrayEncodingParameters(size);
var output = new char[parameters.TotalCode];
var ox = 0; // output index
// number of bits to encode
var imprintedBits = size * 8;
var offset = 0;
while (offset < imprintedBits)
{
var bits = Math.Min(ENCODING_BITS, imprintedBits - offset);
var mask = CutoffMasks[bits];
var encode = imprinted & mask;
var encoded = EncodeTable[encode];
if (bits < ENCODING_BITS)
{
output[ox++] = MakeCutoffCharacter();
}
output[ox++] = encoded;
imprinted >>= bits;
offset += bits;
}
return(output);
}
private static unsafe string ToBase32StringInternal(byte[] array)
{
var parameters = new ArrayEncodingParameters(array.Length);
var encoded = new char[parameters.TotalCode];
var encodedOffset = 0;
fixed(byte *buffer = &array[0])
{
//
// input is processed in blocks of ≤ 5 bytes
//
var block = 0;
var length = array.Length;
// go through all blocks in buffer
while (block < length)
{
// get size of next block
var size = Math.Min(NATIVE_BLOCK_SIZE, length - block);
ulong *imprint = (ulong *)(buffer + block);
ulong imprinted = *imprint;
// limit imprinted bytes to the current block's only
imprinted &= BlockMasks[size];
var encodedBlock = EncodeBlock(imprinted, size);
Array.Copy(encodedBlock, 0, encoded, encodedOffset, encodedBlock.Length);
encodedOffset += encodedBlock.Length;
// skip to the next block
block += NATIVE_BLOCK_SIZE;
}
}
return(new string(encoded));
}
