143 lines
4.2 KiB
C
143 lines
4.2 KiB
C
/** @file
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Implementation of GUID functions.
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The following BaseMemoryLib instances contain the same copy of this file:
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BaseMemoryLib
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BaseMemoryLibMmx
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BaseMemoryLibSse2
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BaseMemoryLibRepStr
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BaseMemoryLibOptDxe
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BaseMemoryLibOptPei
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PeiMemoryLib
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UefiMemoryLib
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Copyright (c) 2006 - 2010, Intel Corporation. All rights reserved.<BR>
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This program and the accompanying materials
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are licensed and made available under the terms and conditions of the BSD License
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which accompanies this distribution. The full text of the license may be found at
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http://opensource.org/licenses/bsd-license.php.
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THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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**/
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#include "MemLibInternals.h"
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/**
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Copies a source GUID to a destination GUID.
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This function copies the contents of the 128-bit GUID specified by SourceGuid to
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DestinationGuid, and returns DestinationGuid.
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If DestinationGuid is NULL, then ASSERT().
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If SourceGuid is NULL, then ASSERT().
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@param DestinationGuid The pointer to the destination GUID.
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@param SourceGuid The pointer to the source GUID.
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@return DestinationGuid.
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**/
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GUID *
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EFIAPI
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CopyGuid (
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OUT GUID *DestinationGuid,
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IN CONST GUID *SourceGuid
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)
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{
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WriteUnaligned64 (
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(UINT64*)DestinationGuid,
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ReadUnaligned64 ((CONST UINT64*)SourceGuid)
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);
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WriteUnaligned64 (
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(UINT64*)DestinationGuid + 1,
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ReadUnaligned64 ((CONST UINT64*)SourceGuid + 1)
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);
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return DestinationGuid;
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}
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/**
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Compares two GUIDs.
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This function compares Guid1 to Guid2. If the GUIDs are identical then TRUE is returned.
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If there are any bit differences in the two GUIDs, then FALSE is returned.
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If Guid1 is NULL, then ASSERT().
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If Guid2 is NULL, then ASSERT().
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@param Guid1 A pointer to a 128 bit GUID.
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@param Guid2 A pointer to a 128 bit GUID.
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@retval TRUE Guid1 and Guid2 are identical.
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@retval FALSE Guid1 and Guid2 are not identical.
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**/
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BOOLEAN
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EFIAPI
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CompareGuid (
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IN CONST GUID *Guid1,
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IN CONST GUID *Guid2
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)
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{
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UINT64 LowPartOfGuid1;
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UINT64 LowPartOfGuid2;
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UINT64 HighPartOfGuid1;
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UINT64 HighPartOfGuid2;
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LowPartOfGuid1 = ReadUnaligned64 ((CONST UINT64*) Guid1);
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LowPartOfGuid2 = ReadUnaligned64 ((CONST UINT64*) Guid2);
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HighPartOfGuid1 = ReadUnaligned64 ((CONST UINT64*) Guid1 + 1);
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HighPartOfGuid2 = ReadUnaligned64 ((CONST UINT64*) Guid2 + 1);
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return (BOOLEAN) (LowPartOfGuid1 == LowPartOfGuid2 && HighPartOfGuid1 == HighPartOfGuid2);
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}
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/**
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Scans a target buffer for a GUID, and returns a pointer to the matching GUID
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in the target buffer.
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This function searches the target buffer specified by Buffer and Length from
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the lowest address to the highest address at 128-bit increments for the 128-bit
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GUID value that matches Guid. If a match is found, then a pointer to the matching
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GUID in the target buffer is returned. If no match is found, then NULL is returned.
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If Length is 0, then NULL is returned.
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If Length > 0 and Buffer is NULL, then ASSERT().
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If Buffer is not aligned on a 32-bit boundary, then ASSERT().
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If Length is not aligned on a 128-bit boundary, then ASSERT().
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If Length is greater than (MAX_ADDRESS - Buffer + 1), then ASSERT().
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@param Buffer The pointer to the target buffer to scan.
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@param Length The number of bytes in Buffer to scan.
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@param Guid The value to search for in the target buffer.
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@return A pointer to the matching Guid in the target buffer or NULL otherwise.
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**/
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VOID *
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EFIAPI
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ScanGuid (
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IN CONST VOID *Buffer,
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IN UINTN Length,
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IN CONST GUID *Guid
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)
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{
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CONST GUID *GuidPtr;
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ASSERT (((UINTN)Buffer & (sizeof (Guid->Data1) - 1)) == 0);
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ASSERT (Length <= (MAX_ADDRESS - (UINTN)Buffer + 1));
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ASSERT ((Length & (sizeof (*GuidPtr) - 1)) == 0);
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GuidPtr = (GUID*)Buffer;
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Buffer = GuidPtr + Length / sizeof (*GuidPtr);
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while (GuidPtr < (CONST GUID*)Buffer) {
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if (CompareGuid (GuidPtr, Guid)) {
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return (VOID*)GuidPtr;
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}
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GuidPtr++;
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}
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return NULL;
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}
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