public virtual long CopyTo(UnsafeNativeMethods.IStream pstm, long cb, long[] pcbRead)
{
int bufsize = 4096; // one page
IntPtr buffer = Marshal.AllocHGlobal(bufsize);
if (buffer == IntPtr.Zero)
{
throw new OutOfMemoryException();
}
long written = 0;
try
{
while (written < cb)
{
int toRead = bufsize;
if (written + toRead > cb)
{
toRead = (int)(cb - written);
}
int read = Read(buffer, toRead);
if (read == 0)
{
break;
}
if (pstm.Write(buffer, read) != read)
{
throw EFail("Wrote an incorrect number of bytes");
}
written += read;
}
}
finally
{
Marshal.FreeHGlobal(buffer);
}
if (pcbRead != null && pcbRead.Length > 0)
{
pcbRead[0] = written;
}
return(written);
}
private unsafe int _Write(void *handle, int bytes)
{
return(comStream.Write((IntPtr)handle, bytes));
}
