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Commit | Line | Data |
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7b3b4b29 | 1 | /** @file\r |
2 | Implementation of GUID functions.\r | |
3 | \r | |
2bfb6009 | 4 | The following BaseMemoryLib instances contain the same copy of this file:\r |
9095d37b | 5 | \r |
7b3b4b29 | 6 | BaseMemoryLib\r |
7 | BaseMemoryLibMmx\r | |
8 | BaseMemoryLibSse2\r | |
9 | BaseMemoryLibRepStr\r | |
2bfb6009 LG |
10 | BaseMemoryLibOptDxe\r |
11 | BaseMemoryLibOptPei\r | |
7b3b4b29 | 12 | PeiMemoryLib\r |
1fef058f | 13 | UefiMemoryLib\r |
7b3b4b29 | 14 | \r |
9095d37b | 15 | Copyright (c) 2006 - 2018, Intel Corporation. All rights reserved.<BR>\r |
9344f092 | 16 | SPDX-License-Identifier: BSD-2-Clause-Patent\r |
1efcc4ae | 17 | \r |
eb1c78db | 18 | **/\r |
7b3b4b29 | 19 | \r |
eb1c78db | 20 | #include "MemLibInternals.h"\r |
7b3b4b29 | 21 | \r |
22 | /**\r | |
23 | Copies a source GUID to a destination GUID.\r | |
24 | \r | |
25 | This function copies the contents of the 128-bit GUID specified by SourceGuid to\r | |
26 | DestinationGuid, and returns DestinationGuid.\r | |
9095d37b | 27 | \r |
7b3b4b29 | 28 | If DestinationGuid is NULL, then ASSERT().\r |
29 | If SourceGuid is NULL, then ASSERT().\r | |
30 | \r | |
2fc59a00 | 31 | @param DestinationGuid The pointer to the destination GUID.\r |
32 | @param SourceGuid The pointer to the source GUID.\r | |
7b3b4b29 | 33 | \r |
34 | @return DestinationGuid.\r | |
35 | \r | |
36 | **/\r | |
37 | GUID *\r | |
38 | EFIAPI\r | |
39 | CopyGuid (\r | |
40 | OUT GUID *DestinationGuid,\r | |
41 | IN CONST GUID *SourceGuid\r | |
42 | )\r | |
43 | {\r | |
44 | WriteUnaligned64 (\r | |
45 | (UINT64*)DestinationGuid,\r | |
46 | ReadUnaligned64 ((CONST UINT64*)SourceGuid)\r | |
47 | );\r | |
48 | WriteUnaligned64 (\r | |
49 | (UINT64*)DestinationGuid + 1,\r | |
50 | ReadUnaligned64 ((CONST UINT64*)SourceGuid + 1)\r | |
51 | );\r | |
52 | return DestinationGuid;\r | |
53 | }\r | |
54 | \r | |
55 | /**\r | |
56 | Compares two GUIDs.\r | |
57 | \r | |
58 | This function compares Guid1 to Guid2. If the GUIDs are identical then TRUE is returned.\r | |
59 | If there are any bit differences in the two GUIDs, then FALSE is returned.\r | |
9095d37b | 60 | \r |
7b3b4b29 | 61 | If Guid1 is NULL, then ASSERT().\r |
62 | If Guid2 is NULL, then ASSERT().\r | |
63 | \r | |
64 | @param Guid1 A pointer to a 128 bit GUID.\r | |
65 | @param Guid2 A pointer to a 128 bit GUID.\r | |
66 | \r | |
67 | @retval TRUE Guid1 and Guid2 are identical.\r | |
68 | @retval FALSE Guid1 and Guid2 are not identical.\r | |
69 | \r | |
70 | **/\r | |
71 | BOOLEAN\r | |
72 | EFIAPI\r | |
73 | CompareGuid (\r | |
74 | IN CONST GUID *Guid1,\r | |
75 | IN CONST GUID *Guid2\r | |
76 | )\r | |
77 | {\r | |
78 | UINT64 LowPartOfGuid1;\r | |
79 | UINT64 LowPartOfGuid2;\r | |
80 | UINT64 HighPartOfGuid1;\r | |
81 | UINT64 HighPartOfGuid2;\r | |
82 | \r | |
83 | LowPartOfGuid1 = ReadUnaligned64 ((CONST UINT64*) Guid1);\r | |
84 | LowPartOfGuid2 = ReadUnaligned64 ((CONST UINT64*) Guid2);\r | |
85 | HighPartOfGuid1 = ReadUnaligned64 ((CONST UINT64*) Guid1 + 1);\r | |
86 | HighPartOfGuid2 = ReadUnaligned64 ((CONST UINT64*) Guid2 + 1);\r | |
87 | \r | |
88 | return (BOOLEAN) (LowPartOfGuid1 == LowPartOfGuid2 && HighPartOfGuid1 == HighPartOfGuid2);\r | |
89 | }\r | |
90 | \r | |
91 | /**\r | |
92 | Scans a target buffer for a GUID, and returns a pointer to the matching GUID\r | |
93 | in the target buffer.\r | |
94 | \r | |
56385d49 | 95 | This function searches the target buffer specified by Buffer and Length from\r |
7b3b4b29 | 96 | the lowest address to the highest address at 128-bit increments for the 128-bit\r |
97 | GUID value that matches Guid. If a match is found, then a pointer to the matching\r | |
98 | GUID in the target buffer is returned. If no match is found, then NULL is returned.\r | |
99 | If Length is 0, then NULL is returned.\r | |
9095d37b | 100 | \r |
7b3b4b29 | 101 | If Length > 0 and Buffer is NULL, then ASSERT().\r |
102 | If Buffer is not aligned on a 32-bit boundary, then ASSERT().\r | |
103 | If Length is not aligned on a 128-bit boundary, then ASSERT().\r | |
eb1c78db | 104 | If Length is greater than (MAX_ADDRESS - Buffer + 1), then ASSERT().\r |
7b3b4b29 | 105 | \r |
2fc59a00 | 106 | @param Buffer The pointer to the target buffer to scan.\r |
107 | @param Length The number of bytes in Buffer to scan.\r | |
108 | @param Guid The value to search for in the target buffer.\r | |
7b3b4b29 | 109 | \r |
110 | @return A pointer to the matching Guid in the target buffer or NULL otherwise.\r | |
111 | \r | |
112 | **/\r | |
113 | VOID *\r | |
114 | EFIAPI\r | |
115 | ScanGuid (\r | |
116 | IN CONST VOID *Buffer,\r | |
117 | IN UINTN Length,\r | |
118 | IN CONST GUID *Guid\r | |
119 | )\r | |
120 | {\r | |
121 | CONST GUID *GuidPtr;\r | |
122 | \r | |
123 | ASSERT (((UINTN)Buffer & (sizeof (Guid->Data1) - 1)) == 0);\r | |
124 | ASSERT (Length <= (MAX_ADDRESS - (UINTN)Buffer + 1));\r | |
125 | ASSERT ((Length & (sizeof (*GuidPtr) - 1)) == 0);\r | |
126 | \r | |
127 | GuidPtr = (GUID*)Buffer;\r | |
128 | Buffer = GuidPtr + Length / sizeof (*GuidPtr);\r | |
129 | while (GuidPtr < (CONST GUID*)Buffer) {\r | |
130 | if (CompareGuid (GuidPtr, Guid)) {\r | |
131 | return (VOID*)GuidPtr;\r | |
132 | }\r | |
133 | GuidPtr++;\r | |
134 | }\r | |
135 | return NULL;\r | |
136 | }\r | |
313831d9 HW |
137 | \r |
138 | /**\r | |
139 | Checks if the given GUID is a zero GUID.\r | |
140 | \r | |
141 | This function checks whether the given GUID is a zero GUID. If the GUID is\r | |
142 | identical to a zero GUID then TRUE is returned. Otherwise, FALSE is returned.\r | |
143 | \r | |
144 | If Guid is NULL, then ASSERT().\r | |
145 | \r | |
146 | @param Guid The pointer to a 128 bit GUID.\r | |
147 | \r | |
148 | @retval TRUE Guid is a zero GUID.\r | |
149 | @retval FALSE Guid is not a zero GUID.\r | |
150 | \r | |
151 | **/\r | |
152 | BOOLEAN\r | |
153 | EFIAPI\r | |
154 | IsZeroGuid (\r | |
155 | IN CONST GUID *Guid\r | |
156 | )\r | |
157 | {\r | |
158 | UINT64 LowPartOfGuid;\r | |
159 | UINT64 HighPartOfGuid;\r | |
160 | \r | |
161 | LowPartOfGuid = ReadUnaligned64 ((CONST UINT64*) Guid);\r | |
162 | HighPartOfGuid = ReadUnaligned64 ((CONST UINT64*) Guid + 1);\r | |
163 | \r | |
164 | return (BOOLEAN) (LowPartOfGuid == 0 && HighPartOfGuid == 0);\r | |
165 | }\r |