public IntPtr pBuffers; //Point to SecBuffer
public SecBufferDesc(int bufferSize)
{
ulVersion = (int)SecBufferType.SECBUFFER_VERSION;
cBuffers = 1;
SecBuffer ThisSecBuffer = new SecBuffer(bufferSize);
pBuffers = Marshal.AllocHGlobal(Marshal.SizeOf(ThisSecBuffer));
Marshal.StructureToPtr(ThisSecBuffer, pBuffers, false);
}
public byte[] GetSecBufferByteArray()
{
byte[] Buffer = null;
if (pBuffers == IntPtr.Zero)
{
throw new InvalidOperationException("Object has already been disposed!!!");
}
if (cBuffers == 1)
{
SecBuffer ThisSecBuffer = (SecBuffer)Marshal.PtrToStructure(pBuffers, typeof(SecBuffer));
if (ThisSecBuffer.cbBuffer > 0)
{
Buffer = new byte[ThisSecBuffer.cbBuffer];
Marshal.Copy(ThisSecBuffer.pvBuffer, Buffer, 0, ThisSecBuffer.cbBuffer);
}
}
else
{
int BytesToAllocate = 0;
for (int Index = 0; Index < cBuffers; Index++)
{
//The bits were written out the following order:
//int cbBuffer;
//int BufferType;
//pvBuffer;
//What we need to do here calculate the total number of bytes we need to copy...
int CurrentOffset = Index * Marshal.SizeOf(typeof(SecBuffer));
BytesToAllocate += Marshal.ReadInt32(pBuffers, CurrentOffset);
}
Buffer = new byte[BytesToAllocate];
for (int Index = 0, BufferIndex = 0; Index < cBuffers; Index++)
{
//The bits were written out the following order:
//int cbBuffer;
//int BufferType;
//pvBuffer;
//Now iterate over the individual buffers and put them together into a
//byte array...
int CurrentOffset = Index * Marshal.SizeOf(typeof(SecBuffer));
int BytesToCopy = Marshal.ReadInt32(pBuffers, CurrentOffset);
IntPtr SecBufferpvBuffer = Marshal.ReadIntPtr(pBuffers, CurrentOffset + Marshal.SizeOf(typeof(int)) + Marshal.SizeOf(typeof(int)));
Marshal.Copy(SecBufferpvBuffer, Buffer, BufferIndex, BytesToCopy);
BufferIndex += BytesToCopy;
}
}
return(Buffer);
}
