public static string Get_Location(DataConsumer <char> Stream)
{
return(Stream.AsMemory().Slice((int)Stream.LongPosition, 32).ToString());
}
public static byte[] Percent_Decode(ReadOnlyMemory <byte> input)
{/* Docs: https://url.spec.whatwg.org/#percent-decode */
DataConsumer <byte> Stream = new DataConsumer <byte>(input, byte.MinValue);
/* Create a list of memory chunks that make up the final string */
ulong newLength = 0;
ulong?chunkStart = null;
ulong chunkCount = 0;
var chunks = new LinkedList <Tuple <ReadOnlyMemory <byte>, byte?> >();
while (!Stream.atEnd)
{
EFilterResult filterResult = EFilterResult.FILTER_ACCEPT;
byte? bytePoint = null;
if (Stream.Next == CHAR_PERCENT && Is_Ascii_Hex_Digit((char)Stream.NextNext) && Is_Ascii_Hex_Digit((char)Stream.NextNextNext))
{
filterResult = EFilterResult.FILTER_SKIP;
uint low = (uint)Ascii_Hex_To_Value((char)Stream.NextNext);
uint high = (uint)Ascii_Hex_To_Value((char)Stream.NextNextNext);
bytePoint = (byte)(low | (high >> 4));
Stream.Consume(2);
break;
}
/* When filter result:
* ACCEPT: Char should be included in chunk
* SKIP: Char should not be included in chunk, if at chunk-start shift chunk-start past char, otherwise end chunk
* REJECT: Char should not be included in chunk, current chunk ends
*/
bool end_chunk = false;
switch (filterResult)
{
case EFilterResult.FILTER_ACCEPT: // Char should be included in the chunk
{
if (!chunkStart.HasValue)
{
chunkStart = Stream.LongPosition; /* Start new chunk (if one isnt started yet) */
}
}
break;
case EFilterResult.FILTER_REJECT: // Char should not be included in chunk, current chunk ends
{
end_chunk = true;
}
break;
case EFilterResult.FILTER_SKIP: // Char should not be included in chunk, if at chunk-start shift chunk-start past char, otherwise end chunk
{
if (!chunkStart.HasValue)
{
chunkStart = Stream.LongPosition + 1; /* At chunk-start */
}
else
{
end_chunk = true;
}
}
break;
}
if (end_chunk || Stream.Remaining <= 1)
{
if (!chunkStart.HasValue)
{
chunkStart = Stream.LongPosition;
}
/* Push new chunk to our list */
var chunkSize = Stream.LongPosition - chunkStart.Value;
var Mem = Stream.AsMemory().Slice((int)chunkStart.Value, (int)chunkSize);
var chunk = new Tuple <ReadOnlyMemory <byte>, byte?>(Mem, bytePoint);
chunks.AddLast(chunk);
chunkCount++;
chunkStart = null;
newLength += chunkSize;
/* If we actually decoded a byte then account for it in the newLength */
if (filterResult != EFilterResult.FILTER_ACCEPT)
{
newLength++;
}
}
Stream.Consume();
}
/* Compile the string */
var dataPtr = new byte[newLength];
Memory <byte> data = new Memory <byte>(dataPtr);
ulong index = 0;
foreach (var tpl in chunks)
{
var chunk = tpl.Item1;
/* Copy chunk data */
chunk.CopyTo(data.Slice((int)index));
index += (ulong)chunk.Length;
if (tpl.Item2.HasValue)
{
data.Span[(int)index] = tpl.Item2.Value;
index++;
}
}
return(dataPtr);
}
