/// <summary> Constructor. </summary>
/// <param name="source"> Source for the. </param>
public CharStream(Stream source)
{
sourceReader = new BinaryReader(source, Encoding);
memory = new MemoryStream();
memoryReader = new BinaryReader(memory, Encoding);
memoryWriter = new BinaryWriter(memory, Encoding);
Position = new CharStreamPosition(0, 1, 1);
}
private CharStream(MemoryStream memory, BinaryReader memoryReader, BinaryWriter memoryWriter,
BinaryReader sourceReader, CharStreamPosition position)
{
this.sourceReader = sourceReader;
this.memory = memory;
this.memoryReader = memoryReader;
this.memoryWriter = memoryWriter;
Position = position;
}
/// <summary> At position. </summary>
/// <param name="position"> The position. </param>
/// <returns> A CharStream. </returns>
public CharStream AtPosition(CharStreamPosition position)
{
return(new CharStream(memory, memoryReader, memoryWriter, sourceReader, position));
}
private long CharsNeeded(long count, CharStreamPosition pos)
{
return(Math.Max(0, count - CharsAvalaible(pos)));
}
private long CharsAvalaible(CharStreamPosition pos)
{
return(memory.Length - pos.Index);
}