private static unsafe bool Read(TFileStream *pStream, ref ulong byteOffset, void *pwBuffer, uint dwBytesToRead)
{
Debug.Assert(dwBytesToRead < int.MaxValue, "Unsupported case; must read < 2GiB worth of data per chunk.");
if (pStream == null)
{
return(false);
}
FileStream fs;
if (!_handlesToStreams.TryGetValue(pStream->hFile, out fs))
{
return(false);
}
byte[] tmpBuf = new byte[dwBytesToRead];
if (byteOffset != 0)
{
long pos = unchecked ((long)byteOffset);
fs.Seek(pos, SeekOrigin.Begin);
}
fs.Read(tmpBuf, 0, unchecked ((int)dwBytesToRead));
IntPtr dest = new IntPtr(pwBuffer);
Marshal.Copy(tmpBuf, 0, dest, unchecked ((int)dwBytesToRead));
byteOffset = (ulong)fs.Position;
return(true);
}
private static unsafe bool GetSize(TFileStream *pStream, ref ulong FileSize)
{
if (pStream == null)
{
return(false);
}
FileStream fs;
if (!_handlesToStreams.TryGetValue(pStream->hFile, out fs))
{
return(false);
}
FileSize = (ulong)fs.Length;
return(true);
}
private static unsafe bool GetPos(TFileStream *pStream, ref ulong byteOffset)
{
if (pStream == null)
{
return(false);
}
FileStream fs;
if (!_handlesToStreams.TryGetValue(pStream->hFile, out fs))
{
return(false);
}
long pos = fs.Position;
byteOffset = (ulong)pos;
return(true);
}
private static unsafe bool SetSize(TFileStream *pStream, ulong FileSize)
{
// Not supported in v1
return(false);
}
private static unsafe bool Write(TFileStream *pStream, ref ulong pByteOffset, void *pvBuffer, uint dwBytesToWrite)
{
// Not supported in v1
return(false);
}