diff options
Diffstat (limited to 'src/System.Private.CoreLib/shared/System/Guid.Unix.cs')
-rw-r--r-- | src/System.Private.CoreLib/shared/System/Guid.Unix.cs | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/src/System.Private.CoreLib/shared/System/Guid.Unix.cs b/src/System.Private.CoreLib/shared/System/Guid.Unix.cs new file mode 100644 index 000000000..442e7f883 --- /dev/null +++ b/src/System.Private.CoreLib/shared/System/Guid.Unix.cs @@ -0,0 +1,38 @@ +// Licensed to the .NET Foundation under one or more agreements. +// The .NET Foundation licenses this file to you under the MIT license. +// See the LICENSE file in the project root for more information. + +using System.Diagnostics; +using System.Runtime.InteropServices; + +namespace System +{ + partial struct Guid + { + // This will create a new random guid based on the https://www.ietf.org/rfc/rfc4122.txt + public static unsafe Guid NewGuid() + { + Guid g; + Interop.GetRandomBytes((byte*)&g, sizeof(Guid)); + + const ushort VersionMask = 0xF000; + const ushort RandomGuidVersion = 0x4000; + + const byte ClockSeqHiAndReservedMask = 0xC0; + const byte ClockSeqHiAndReservedValue = 0x80; + + // Modify bits indicating the type of the GUID + + unchecked + { + // time_hi_and_version + g._c = (short)((g._c & ~VersionMask) | RandomGuidVersion); + // clock_seq_hi_and_reserved + g._d = (byte)((g._d & ~ClockSeqHiAndReservedMask) | ClockSeqHiAndReservedValue); + } + + return g; + } + } +} + |