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878ddf1f 1/** @file\r
2 Implementation of GUID functions.\r
3\r
4 Copyright (c) 2006, Intel Corporation<BR>\r
5 All rights reserved. This program and the accompanying materials\r
6 are licensed and made available under the terms and conditions of the BSD License\r
7 which accompanies this distribution. The full text of the license may be found at\r
8 http://opensource.org/licenses/bsd-license.php\r
9\r
10 THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r
11 WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r
12\r
13 Module Name: MemLibGuid.c\r
14\r
15 The following BaseMemoryLib instances share the same version of this file:\r
16\r
17 BaseMemoryLib\r
18 BaseMemoryLibMmx\r
19 BaseMemoryLibSse2\r
20 BaseMemoryLibRepStr\r
21 PeiMemoryLib\r
add13dc2 22 DxeMemoryLib\r
878ddf1f 23\r
24**/\r
25\r
26/**\r
24e25d11 27 Copies a source GUID to a destination GUID.\r
878ddf1f 28\r
24e25d11 29 This function copies the contents of the 128-bit GUID specified by SourceGuid to\r
30 DestinationGuid, and returns DestinationGuid.\r
878ddf1f 31 If DestinationGuid is NULL, then ASSERT().\r
32 If SourceGuid is NULL, then ASSERT().\r
33\r
24e25d11 34 @param DestinationGuid Pointer to the destination GUID.\r
35 @param SourceGuid Pointer to the source GUID.\r
878ddf1f 36\r
24e25d11 37 @return DestinationGuid.\r
878ddf1f 38\r
39**/\r
40GUID *\r
41EFIAPI\r
42CopyGuid (\r
24e25d11 43 OUT GUID *DestinationGuid,\r
44 IN CONST GUID *SourceGuid\r
878ddf1f 45 )\r
46{\r
47 WriteUnaligned64 (\r
48 (UINT64*)DestinationGuid,\r
49 ReadUnaligned64 ((CONST UINT64*)SourceGuid)\r
50 );\r
51 WriteUnaligned64 (\r
52 (UINT64*)DestinationGuid + 1,\r
53 ReadUnaligned64 ((CONST UINT64*)SourceGuid + 1)\r
54 );\r
55 return DestinationGuid;\r
56}\r
57\r
58/**\r
24e25d11 59 Compares two GUIDs.\r
878ddf1f 60\r
24e25d11 61 This function compares Guid1 to Guid2. If the GUIDs are identical then TRUE is returned.\r
62 If there are any bit differences in the two GUIDs, then FALSE is returned.\r
878ddf1f 63 If Guid1 is NULL, then ASSERT().\r
64 If Guid2 is NULL, then ASSERT().\r
65\r
24e25d11 66 @param Guid1 A pointer to a 128 bit GUID.\r
67 @param Guid2 A pointer to a 128 bit GUID.\r
878ddf1f 68\r
24e25d11 69 @retval TRUE Guid1 and Guid2 are identical.\r
70 @retval FALSE Guid1 and Guid2 are not identical.\r
878ddf1f 71\r
72**/\r
73BOOLEAN\r
74EFIAPI\r
75CompareGuid (\r
24e25d11 76 IN CONST GUID *Guid1,\r
77 IN CONST GUID *Guid2\r
878ddf1f 78 )\r
79{\r
80 return (BOOLEAN)(\r
81 ReadUnaligned64 ((CONST UINT64*)Guid1)\r
82 == ReadUnaligned64 ((CONST UINT64*)Guid2) &&\r
83 ReadUnaligned64 ((CONST UINT64*)Guid1 + 1)\r
84 == ReadUnaligned64 ((CONST UINT64*)Guid2 + 1)\r
85 );\r
86}\r
87\r
88/**\r
89 Scans a target buffer for a GUID, and returns a pointer to the matching GUID\r
90 in the target buffer.\r
91\r
92 This function searches target the buffer specified by Buffer and Length from\r
24e25d11 93 the lowest address to the highest address at 128-bit increments for the 128-bit\r
94 GUID value that matches Guid. If a match is found, then a pointer to the matching\r
95 GUID in the target buffer is returned. If no match is found, then NULL is returned.\r
96 If Length is 0, then NULL is returned.\r
97 If Length > 0 and Buffer is NULL, then ASSERT().\r
add13dc2 98 If Buffer is not aligned on a 32-bit boundary, then ASSERT().\r
99 If Length is not aligned on a 128-bit boundary, then ASSERT().\r
511710d6 100 If Length is greater than (MAX_ADDRESS ? Buffer + 1), then ASSERT(). \r
878ddf1f 101\r
102 @param Buffer Pointer to the target buffer to scan.\r
103 @param Length Number of bytes in Buffer to scan.\r
104 @param Guid Value to search for in the target buffer.\r
105\r
24e25d11 106 @return A pointer to the matching Guid in the target buffer or NULL otherwise.\r
107\r
878ddf1f 108**/\r
109VOID *\r
110EFIAPI\r
111ScanGuid (\r
24e25d11 112 IN CONST VOID *Buffer,\r
113 IN UINTN Length,\r
114 IN CONST GUID *Guid\r
878ddf1f 115 )\r
116{\r
117 CONST GUID *GuidPtr;\r
118\r
add13dc2 119 ASSERT (((UINTN)Buffer & (sizeof (Guid->Data1) - 1)) == 0);\r
19b362e8 120 ASSERT (Length <= (MAX_ADDRESS - (UINTN)Buffer + 1));\r
add13dc2 121 ASSERT ((Length & (sizeof (*GuidPtr) - 1)) == 0);\r
19b362e8 122\r
878ddf1f 123 GuidPtr = (GUID*)Buffer;\r
add13dc2 124 Buffer = GuidPtr + Length / sizeof (*GuidPtr);\r
878ddf1f 125 while (GuidPtr < (CONST GUID*)Buffer) {\r
126 if (CompareGuid (GuidPtr, Guid)) {\r
127 return (VOID*)GuidPtr;\r
128 }\r
129 GuidPtr++;\r
130 }\r
131 return NULL;\r
132}\r