private int EnsureRawBuffer(int requestedLength)
{
Monitor.Enter(_syncRoot);
try
{
if (_lineIndex < -1)
{
throw new ObjectDisposedException(GetType().AssemblyQualifiedName);
}
if (_lineIndex < 0)
{
throw new InvalidOperationException("Stream reader has already been closed.");
}
long availableBytes;
int margin;
if (requestedLength <= _rawBuffer.Count || _rawBuffer.Free == 0 || (availableBytes = _innerStream.Length - _innerStream.Position) == 0L)
{
return(_rawBuffer.Count);
}
requestedLength = _rawBuffer.Free;
if (availableBytes < (long)requestedLength)
{
requestedLength = (int)availableBytes;
}
byte[] buffer = new byte[_rawBuffer.Free];
requestedLength = _innerStream.Read(buffer, 0, requestedLength);
if (requestedLength < 1)
{
return(0);
}
margin = _rawBuffer.Write(requestedLength, buffer);
margin = (margin > 0) ? requestedLength - margin : requestedLength;
if (margin > 0)
{
availableBytes = _innerStream.Position - (long)margin;
_innerStream.Seek((availableBytes > 0L) ? availableBytes : 0L, SeekOrigin.Begin);
}
return(_rawBuffer.Count);
}
finally { Monitor.Exit(_syncRoot); }
}
private int EnsureCharBuffer(int requestedLength)
{
Monitor.Enter(_syncRoot);
try
{
if (_lineIndex < -1)
{
throw new ObjectDisposedException(GetType().AssemblyQualifiedName);
}
if (_lineIndex < 0)
{
throw new InvalidOperationException("Stream reader has already been closed.");
}
int availableSpace;
int bytesInRequestedChars = _encoding.GetMaxByteCount(requestedLength);
if (requestedLength <= _charBuffer.Count || _charBuffer.Free == 0 || (availableSpace = EnsureRawBuffer(bytesInRequestedChars)) == 0)
{
return(_charBuffer.Count);
}
requestedLength = _charBuffer.Free;
char[] convertedChars;
try { convertedChars = _encoding.GetChars(_rawBuffer.Peek(bytesInRequestedChars)); }
catch { convertedChars = _encoding.GetChars(_rawBuffer.Peek(bytesInRequestedChars - 1)); }
int charAddCount = _charBuffer.Write(convertedChars);
if (charAddCount < requestedLength)
{
convertedChars = convertedChars.Take(charAddCount).ToArray();
}
_rawBuffer.Purge(_encoding.GetByteCount(convertedChars));
return(_charBuffer.Count);
}
finally { Monitor.Exit(_syncRoot); }
}
