mirror of https://github.com/acidanthera/audk.git
132 lines
3.8 KiB
C
132 lines
3.8 KiB
C
/** @file
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Implementation of GUID functions.
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Copyright (c) 2006, Intel Corporation<BR>
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All rights reserved. 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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Module Name: MemLibGuid.c
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The following BaseMemoryLib instances share the same version 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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PeiMemoryLib
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UefiMemoryLib
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**/
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/**
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This function 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
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to 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 Pointer to the destination GUID.
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@param SourceGuid 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
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is returned. If there are any bit differences in the two GUIDs, then FALSE is
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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 guid to compare
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@param Guid2 guid to compare
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@retval TRUE if Guid1 == Guid2
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@retval FALSE if Guid1 != Guid2
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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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return (BOOLEAN)(
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ReadUnaligned64 ((CONST UINT64*)Guid1)
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== ReadUnaligned64 ((CONST UINT64*)Guid2) &&
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ReadUnaligned64 ((CONST UINT64*)Guid1 + 1)
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== ReadUnaligned64 ((CONST UINT64*)Guid2 + 1)
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);
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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 target the buffer specified by Buffer and Length from
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the lowest address to the highest address at 128-bit increments for the
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128-bit GUID value that matches Guid. If a match is found, then a pointer to
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the matching GUID in the target buffer is returned. If no match is found,
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then NULL is returned. If Length is 0, then NULL is returned.
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If Buffer is NULL, then ASSERT().
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If Buffer is not aligned on a 64-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 Pointer to the target buffer to scan.
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@param Length Number of bytes in Buffer to scan.
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@param Guid Value to search for in the target buffer.
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@return Pointer to the first occurrence.
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@retval NULL if Length == 0 or Guid was not found.
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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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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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