private bool IndexOf(ref IndexOfResult result, IBuffer buffer)
{
int start = buffer.Postion;
int length = buffer.Length;
Span <byte> data = buffer.Memory.Span;
Span <byte> eof = result.EofData;
int eoflen = eof.Length;
result.End = buffer;
int eofindex = result.EofIndex;
int endpoint;
for (int i = start; i < length; i++)
{
result.Length++;
if (data[i] == eof[eofindex])
{
eofindex++;
endpoint = i;
if (eofindex == eoflen)
{
result.EndPostion = endpoint;
return(true);
}
}
else
{
eofindex = 0;
}
}
result.EofIndex = eofindex;
result.End = null;
return(false);
}
private IndexOfResult IndexOf(byte[] eof)
{
IndexOfResult result = new IndexOfResult
{
EofData = eof
};
if (eof == null || _length < eof.Length)
{
return(result);
}
IBuffer rbuffer = GetReadBuffer();
if (rbuffer == null)
{
return(result);
}
result.Start = rbuffer;
result.StartPostion = rbuffer.Postion;
if (IndexOf(ref result, rbuffer))
{
return(result);
}
rbuffer = rbuffer.Next;
while (rbuffer != null)
{
if (IndexOf(ref result, rbuffer))
{
return(result);
}
rbuffer = rbuffer.Next;
}
return(result);
}
public bool TryReadWith(byte[] eof, out string value, bool returnEof = false)
{
value = null;
IndexOfResult result = IndexOf(eof);
int length = result.Length;
if (result.End != null)
{
if (result.Start.Id == result.End.Id)
{
char[] charSpan = _charCacheBlock;
if (result.Length < _cacheBlockLength)
{
var len = Encoding.GetChars(result.Start.Data, result.StartPostion, length, charSpan, 0);
if (returnEof)
{
value = new string(charSpan, 0, len);
}
else
{
value = new string(charSpan, 0, len - eof.Length);
}
ReadFree(length);
}
else
{
if (returnEof)
{
value = ReadString(result.Length);
}
else
{
value = ReadString(result.Length - eof.Length);
Read(eof, 0, eof.Length);
}
}
}
else
{
if (returnEof)
{
value = ReadString(result.Length);
}
else
{
value = ReadString(result.Length - eof.Length);
Read(eof, 0, eof.Length);
}
}
return(true);
}
return(false);
}
public bool TryReadWith(byte[] eof, out byte[] value, bool returnEof = false)
{
value = null;
IndexOfResult result = IndexOf(eof);
if (result.End != null)
{
int readLength;
if (returnEof)
{
readLength = result.Length;
value = Read(readLength);
}
else
{
readLength = result.Length - eof.Length;
value = Read(readLength);
Read(eof, 0, eof.Length);
}
return(true);
}
return(false);
}
