/// <summary>
/// Update length and offset of UPN and DNS Domain.
/// </summary>
private void UpdateOffsetLength()
{
int upnOffset = Marshal.SizeOf(NativeUpnDnsInfo.GetType());
NativeUpnDnsInfo.UpnOffset = (ushort)PacUtility.AlignTo(upnOffset, UpnDnsAlignUnit);
NativeUpnDnsInfo.UpnLength = (ushort)(Encoding.Unicode.GetByteCount(Upn));
int dnsOffset = NativeUpnDnsInfo.UpnOffset + NativeUpnDnsInfo.UpnLength;
NativeUpnDnsInfo.DnsDomainNameOffset = (ushort)PacUtility.AlignTo(dnsOffset, UpnDnsAlignUnit);
NativeUpnDnsInfo.DnsDomainNameLength = (ushort)(Encoding.Unicode.GetByteCount(DnsDomain));
}
/// <summary>
/// Concatenate specified header buffer and specified body buffers.
/// </summary>
/// <param name="header">The specified header buffer.</param>
/// <param name="bodyReferences">The specified body buffers.</param>
/// <returns>The integrated buffer.</returns>
private byte[] ConcatenateBuffers(byte[] header, byte[][] bodyReferences)
{
// calculate total totalLength
int totalLength = header.Length;
for (int i = 0; i < NativePacType.cBuffers; i++)
{
if (bodyReferences[i] == null)
{
continue;
}
int length = bodyReferences[i].Length;
// double check the length
// NativePacType.Buffers[index].cbBufferSize has been updated in previous
// UpdateInterrelatedFields() method, given by each pacInfoBuffer's
// CalculateSize() method.
// following evaluation double check whether CalculateSize() method's
// result conforms to EncodeBuffer() method's result.
// Note: some kind of pacInfoBuffers return EncodeBuffer().Length as the
// CalculateSize(), such as NDR encoded structures. But some other
// pacInfoBuffers can calculate totalLength without encoding the structure.
AssertBufferSize(NativePacType.Buffers, i, length);
totalLength += PacUtility.AlignTo(length, PacTypeAlignUnit);
}
byte[] total = new byte[totalLength];
int offset = 0;
Buffer.BlockCopy(header, 0, total, offset, header.Length);
offset += header.Length;
for (int i = 0; i < bodyReferences.Length; ++i)
{
if (bodyReferences[i] == null)
{
continue;
}
int length = bodyReferences[i].Length;
Buffer.BlockCopy(bodyReferences[i], 0, total, offset, length);
offset += PacUtility.AlignTo(length, PacTypeAlignUnit);
}
return(total);
}
/// <summary>
/// Update cbBufferSize and Offset of all PAC_INFO_BUFFERs
/// after the buffers' content updated.
/// </summary>
public void UpdateInterrelatedFields()
{
AssertBuffersCount(pacInfoBuffers.Length, NativePacType.Buffers.Length);
int offset = CalculateHeaderSize();
for (int i = 0; i < pacInfoBuffers.Length; i++)
{
NativePacType.Buffers[i].Offset = (ulong)offset;
if (pacInfoBuffers[i] == null)
{
continue;
}
int size = pacInfoBuffers[i].CalculateSize();
NativePacType.Buffers[i].cbBufferSize = (uint)size;
offset += size;
//TD section 2.3: "All PAC elements MUST be placed on an 8-byte boundary."
offset = PacUtility.AlignTo(offset, PacTypeAlignUnit);
}
}
