public long CopyTo(UnsafeNativeMethodsR.IStream pstm, long cb, long[] pcbRead)
{
int cb1 = 4096;
IntPtr num1 = Marshal.AllocHGlobal(cb1);
if (num1 == IntPtr.Zero)
throw new OutOfMemoryException();
long num2 = 0L;
try
{
while (num2 < cb)
{
int length = cb1;
if (num2 + (long)length > cb)
length = (int)(cb - num2);
int len = this.Read(num1, length);
if (len != 0)
{
if (pstm.Write(num1, len) != len)
throw UnsafeNativeMethodsR.ComStreamFromDataStream.EFail("Wrote an incorrect number of bytes");
num2 += (long)len;
}
else
break;
}
}
finally
{
Marshal.FreeHGlobal(num1);
}
if (pcbRead != null && pcbRead.Length > 0)
pcbRead[0] = num2;
return num2;
}
