1 /** @file 2 Implementation of GUID functions. 3 4 The following BaseMemoryLib instances contain the same copy of this file: 5 6 BaseMemoryLib 7 BaseMemoryLibMmx 8 BaseMemoryLibSse2 9 BaseMemoryLibRepStr 10 BaseMemoryLibOptDxe 11 BaseMemoryLibOptPei 12 PeiMemoryLib 13 UefiMemoryLib 14 15 Copyright (c) 2006 - 2009, Intel Corporation. All rights reserved.<BR> 16 This program and the accompanying materials 17 are licensed and made available under the terms and conditions of the BSD License 18 which accompanies this distribution. The full text of the license may be found at 19 http://opensource.org/licenses/bsd-license.php 20 21 THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, 22 WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. 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 34 If DestinationGuid is NULL, then ASSERT(). 35 If SourceGuid is NULL, then ASSERT(). 36 37 @param DestinationGuid Pointer to the destination GUID. 38 @param SourceGuid Pointer to the source GUID. 39 40 @return DestinationGuid. 41 42 **/ 43 GUID * 44 EFIAPI 45 CopyGuid ( 46 OUT GUID *DestinationGuid, 47 IN CONST GUID *SourceGuid 48 ) 49 { 50 WriteUnaligned64 ( 51 (UINT64*)DestinationGuid, 52 ReadUnaligned64 ((CONST UINT64*)SourceGuid) 53 ); 54 WriteUnaligned64 ( 55 (UINT64*)DestinationGuid + 1, 56 ReadUnaligned64 ((CONST UINT64*)SourceGuid + 1) 57 ); 58 return DestinationGuid; 59 } 60 61 /** 62 Compares two GUIDs. 63 64 This function compares Guid1 to Guid2. If the GUIDs are identical then TRUE is returned. 65 If there are any bit differences in the two GUIDs, then FALSE is returned. 66 67 If Guid1 is NULL, then ASSERT(). 68 If Guid2 is NULL, then ASSERT(). 69 70 @param Guid1 A pointer to a 128 bit GUID. 71 @param Guid2 A pointer to a 128 bit GUID. 72 73 @retval TRUE Guid1 and Guid2 are identical. 74 @retval FALSE Guid1 and Guid2 are not identical. 75 76 **/ 77 BOOLEAN 78 EFIAPI 79 CompareGuid ( 80 IN CONST GUID *Guid1, 81 IN CONST GUID *Guid2 82 ) 83 { 84 return (CompareMem(Guid1, Guid2, sizeof(GUID) == 0)) ? TRUE : FALSE; 85 } 86 87 /** 88 Scans a target buffer for a GUID, and returns a pointer to the matching GUID 89 in the target buffer. 90 91 This function searches the target buffer specified by Buffer and Length from 92 the lowest address to the highest address at 128-bit increments for the 128-bit 93 GUID value that matches Guid. If a match is found, then a pointer to the matching 94 GUID in the target buffer is returned. If no match is found, then NULL is returned. 95 If Length is 0, then NULL is returned. 96 97 If Length > 0 and Buffer is NULL, then ASSERT(). 98 If Buffer is not aligned on a 32-bit boundary, then ASSERT(). 99 If Length is not aligned on a 128-bit boundary, then ASSERT(). 100 If Length is greater than (MAX_ADDRESS - Buffer + 1), then ASSERT(). 101 102 @param Buffer Pointer to the target buffer to scan. 103 @param Length Number of bytes in Buffer to scan. 104 @param Guid Value to search for in the target buffer. 105 106 @return A pointer to the matching Guid in the target buffer or NULL otherwise. 107 108 **/ 109 VOID * 110 EFIAPI 111 ScanGuid ( 112 IN CONST VOID *Buffer, 113 IN UINTN Length, 114 IN CONST GUID *Guid 115 ) 116 { 117 CONST GUID *GuidPtr; 118 119 ASSERT (((UINTN)Buffer & (sizeof (Guid->Data1) - 1)) == 0); 120 ASSERT (Length <= (MAX_ADDRESS - (UINTN)Buffer + 1)); 121 ASSERT ((Length & (sizeof (*GuidPtr) - 1)) == 0); 122 123 GuidPtr = (GUID*)Buffer; 124 Buffer = GuidPtr + Length / sizeof (*GuidPtr); 125 while (GuidPtr < (CONST GUID*)Buffer) { 126 if (CompareGuid (GuidPtr, Guid)) { 127 return (VOID*)GuidPtr; 128 } 129 GuidPtr++; 130 } 131 return NULL; 132 } 133
