Add inf files for PeiSmbusLibSmbus2, PeiDxePostCodeLibReportStatusCode, PeiMemoryLib...
[mirror_edk2.git] / MdePkg / Library / PeiMemoryLib / MemLibGuid.c
1 /** @file
2 Implementation of GUID functions.
3
4 Copyright (c) 2006, Intel Corporation<BR>
5 All rights reserved. This program and the accompanying materials
6 are licensed and made available under the terms and conditions of the BSD License
7 which accompanies this distribution. The full text of the license may be found at
8 http://opensource.org/licenses/bsd-license.php
9
10 THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
11 WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
12
13 Module Name: MemLibGuid.c
14
15 The following BaseMemoryLib instances share the same version of this file:
16
17 BaseMemoryLib
18 BaseMemoryLibMmx
19 BaseMemoryLibSse2
20 BaseMemoryLibRepStr
21 PeiMemoryLib
22 DxeMemoryLib
23
24 **/
25
26 #include "MemLibInternals.h"
27
28 /**
29 Copies a source GUID to a destination GUID.
30
31 This function copies the contents of the 128-bit GUID specified by SourceGuid to
32 DestinationGuid, and returns DestinationGuid.
33 If DestinationGuid is NULL, then ASSERT().
34 If SourceGuid is NULL, then ASSERT().
35
36 @param DestinationGuid Pointer to the destination GUID.
37 @param SourceGuid Pointer to the source GUID.
38
39 @return DestinationGuid.
40
41 **/
42 GUID *
43 EFIAPI
44 CopyGuid (
45 OUT GUID *DestinationGuid,
46 IN CONST GUID *SourceGuid
47 )
48 {
49 WriteUnaligned64 (
50 (UINT64*)DestinationGuid,
51 ReadUnaligned64 ((CONST UINT64*)SourceGuid)
52 );
53 WriteUnaligned64 (
54 (UINT64*)DestinationGuid + 1,
55 ReadUnaligned64 ((CONST UINT64*)SourceGuid + 1)
56 );
57 return DestinationGuid;
58 }
59
60 /**
61 Compares two GUIDs.
62
63 This function compares Guid1 to Guid2. If the GUIDs are identical then TRUE is returned.
64 If there are any bit differences in the two GUIDs, then FALSE is returned.
65 If Guid1 is NULL, then ASSERT().
66 If Guid2 is NULL, then ASSERT().
67
68 @param Guid1 A pointer to a 128 bit GUID.
69 @param Guid2 A pointer to a 128 bit GUID.
70
71 @retval TRUE Guid1 and Guid2 are identical.
72 @retval FALSE Guid1 and Guid2 are not identical.
73
74 **/
75 BOOLEAN
76 EFIAPI
77 CompareGuid (
78 IN CONST GUID *Guid1,
79 IN CONST GUID *Guid2
80 )
81 {
82 UINT64 LowPartOfGuid1;
83 UINT64 LowPartOfGuid2;
84 UINT64 HighPartOfGuid1;
85 UINT64 HighPartOfGuid2;
86
87 LowPartOfGuid1 = ReadUnaligned64 ((CONST UINT64*) Guid1);
88 LowPartOfGuid2 = ReadUnaligned64 ((CONST UINT64*) Guid2);
89 HighPartOfGuid1 = ReadUnaligned64 ((CONST UINT64*) Guid1 + 1);
90 HighPartOfGuid2 = ReadUnaligned64 ((CONST UINT64*) Guid2 + 1);
91
92 return (BOOLEAN) (LowPartOfGuid1 == LowPartOfGuid2 && HighPartOfGuid1 == HighPartOfGuid2);
93 }
94
95 /**
96 Scans a target buffer for a GUID, and returns a pointer to the matching GUID
97 in the target buffer.
98
99 This function searches target the buffer specified by Buffer and Length from
100 the lowest address to the highest address at 128-bit increments for the 128-bit
101 GUID value that matches Guid. If a match is found, then a pointer to the matching
102 GUID in the target buffer is returned. If no match is found, then NULL is returned.
103 If Length is 0, then NULL is returned.
104 If Length > 0 and Buffer is NULL, then ASSERT().
105 If Buffer is not aligned on a 32-bit boundary, then ASSERT().
106 If Length is not aligned on a 128-bit boundary, then ASSERT().
107 If Length is greater than (MAX_ADDRESS ? Buffer + 1), then ASSERT().
108
109 @param Buffer Pointer to the target buffer to scan.
110 @param Length Number of bytes in Buffer to scan.
111 @param Guid Value to search for in the target buffer.
112
113 @return A pointer to the matching Guid in the target buffer or NULL otherwise.
114
115 **/
116 VOID *
117 EFIAPI
118 ScanGuid (
119 IN CONST VOID *Buffer,
120 IN UINTN Length,
121 IN CONST GUID *Guid
122 )
123 {
124 CONST GUID *GuidPtr;
125
126 ASSERT (((UINTN)Buffer & (sizeof (Guid->Data1) - 1)) == 0);
127 ASSERT (Length <= (MAX_ADDRESS - (UINTN)Buffer + 1));
128 ASSERT ((Length & (sizeof (*GuidPtr) - 1)) == 0);
129
130 GuidPtr = (GUID*)Buffer;
131 Buffer = GuidPtr + Length / sizeof (*GuidPtr);
132 while (GuidPtr < (CONST GUID*)Buffer) {
133 if (CompareGuid (GuidPtr, Guid)) {
134 return (VOID*)GuidPtr;
135 }
136 GuidPtr++;
137 }
138 return NULL;
139 }