public override int Read(byte[] buffer, int offset, int count)
{
int read = 0, dstOffset = 0;
for (int i = _current; i < _chunks.Count; i++)
{
ByteArrayChunk chunk = _chunks[i];
int bytesInChunk = chunk.Count - _offset;
if (bytesInChunk > count)
{
Array.Copy(chunk.Array, chunk.Index + _offset, buffer, dstOffset, count);
read += count;
_offset += count;
_position += count;
return(read);
}
Array.Copy(chunk.Array, chunk.Index + _offset, buffer, dstOffset, bytesInChunk);
read += bytesInChunk;
count -= bytesInChunk;
dstOffset += bytesInChunk;
_position += bytesInChunk;
// Allow garbage collection for the chunk, its already been read
_chunks[_current] = null;
_current++;
_offset = 0;
}
return(read);
}
public override long Seek(long offset, SeekOrigin origin)
{
if (origin == SeekOrigin.Begin)
{
_current = 0;
_offset = 0;
_position = 0;
}
if (origin == SeekOrigin.End)
{
_current = _chunks.Count - 1;
_offset = _chunks[_current].Count - 1;
_position = _length - 1;
}
_position += offset;
if (_position < 0)
{
_position = 0;
}
else if (_position >= _length)
{
_position = _length - 1;
}
_current = 0;
_offset = 0;
long remain = _position;
for (int i = 0; i < _chunks.Count; i++)
{
ByteArrayChunk chunk = _chunks[i];
if (chunk == null)
{
throw new NotSupportedException("Seek not supported at this time");
}
if (remain > chunk.Count)
{
remain -= chunk.Count;
}
else
{
_offset = (int)remain;
return(_position);
}
_current++;
}
_position -= remain;
return(_position);
}
public ByteArrayChunk ReadBytesToArraySegment(String name, int count)
{
CheckOffset(count, name);
var segment = new ByteArrayChunk {Array = _ms.GetBuffer(), Count = count, Index = (int) _ms.Position};
_ms.Seek(count, SeekOrigin.Current);
return segment;
}
public uint Read(RawPDU raw)
{
uint len = raw.ReadUInt32("PDV-Length");
_pcid = raw.ReadByte("Presentation Context ID");
byte mch = raw.ReadByte("Message Control Header");
_value = raw.ReadBytesToArraySegment("PDV Value", (int)len - 2);
_command = (mch & 0x01) != 0;
_last = (mch & 0x02) != 0;
return len + 4;
}
public PDV(byte pcid, byte[] value, bool command, bool last)
{
_pcid = pcid;
_value = new ByteArrayChunk { Array = value, Count = value.Length, Index = 0 };
_command = command;
_last = last;
}
public void AddChunk(ByteArrayChunk chunk)
{
_chunks.Add(chunk);
_length += chunk.Count;
}
public void AddChunk(ByteArrayChunk chunk)
{
_chunks.Add(chunk);
_length += chunk.Count;
}