1// Licensed to the .NET Foundation under one or more agreements.
2// The .NET Foundation licenses this file to you under the MIT license.
3// See the LICENSE file in the project root for more information.
4//
5
6//
7// ===========================================================================
8// File: guid.cpp
9//
10// PALRT guids
11// ===========================================================================
12
13#define INITGUID
14#include <guiddef.h>
15
16// These are GUIDs and IIDs that would normally be provided by the system via uuid.lib,
17// and that the PALRT exposes through headers.
18
19DEFINE_GUID(GUID_NULL, 0x00000000, 0x0000, 0x0000, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00);
20DEFINE_GUID(IID_IUnknown, 0x00000000, 0x0000, 0x0000, 0xC0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x46);
21DEFINE_GUID(IID_IClassFactory, 0x00000001, 0x0000, 0x0000, 0xC0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x46);
22
23
24// objidl.idl
25DEFINE_GUID(IID_ISequentialStream, 0x0c733a30, 0x2a1c, 0x11ce, 0xad, 0xe5, 0x00, 0xaa, 0x00, 0x44, 0x77, 0x3d);
26DEFINE_GUID(IID_IStream, 0x0000000c, 0x0000, 0x0000, 0xC0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x46);
27
28// Create a random guid based on the https://www.ietf.org/rfc/rfc4122.txt
29STDAPI
30CoCreateGuid(OUT GUID * pguid)
31{
32 PAL_Random(pguid, sizeof(GUID));
33
34 static const USHORT VersionMask = 0xF000;
35 static const USHORT RandomGuidVersion = 0x4000;
36
37 static const BYTE ClockSeqHiAndReservedMask = 0xC0;
38 static const BYTE ClockSeqHiAndReservedValue = 0x80;
39
40 // Modify bits indicating the type of the GUID
41
42 // time_hi_and_version
43 pguid->Data3 = (pguid->Data3 & ~VersionMask) | RandomGuidVersion;
44 // clock_seq_hi_and_reserved
45 pguid->Data4[0] = (pguid->Data4[0] & ~ClockSeqHiAndReservedMask) | ClockSeqHiAndReservedValue;
46
47 return S_OK;
48}
49