private static unsafe ulong DecodeBlock(char *codeBuffer, DecodingBlock block)
{
ulong receptor = 0; // receives imprinted
var imprintOffset = 0;
for (int i = 0; i < block.CodeLength; i++)
{
var code = *(codeBuffer + i);
if (IsCutoffCharacter(code))
{
continue;
}
var data = DecodeTable[code];
ulong imprinted = 0;
imprinted |= data;
imprinted <<= imprintOffset;
receptor |= imprinted;
imprintOffset += ENCODING_BITS;
}
return(receptor);
}
internal static bool MarkupBlocks(ref DecodingBlock current, List <DecodingBlock> accumulator, string input, bool finalize)
{
var inputLength = input.Length;
for (int i = 0; i < inputLength; i++)
{
var is_final = finalize && (i == inputLength - 1); // is it the final character?
var c = input[i];
bool eob;
try
{
// verify next character against block descriptor
// and adjust block parameters
eob = current.AddCode(c, is_final); // end of block
}
catch (InvalidOperationException iox)
{
throw new ArgumentException(DECODE_ERROR_MESSAGE, nameof(input), iox); // invalid code(s) added to the block
}
if (eob)
{ // if block is finished
accumulator.Add(current); // add to the accumulator
current = new DecodingBlock(); // and start a new block
}
}
return(accumulator.Any());
}
private static byte[] FromBase32StringInternal(string input)
{
var accumulator = new List <DecodingBlock>();
var current = new DecodingBlock();
MarkupBlocks(ref current, accumulator, input, true);
return(DecodeBlockSequence(input, accumulator));
}
