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490 lines
16 KiB
490 lines
16 KiB
4 years ago
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/** @file
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Provides copy memory, fill memory, zero memory, and GUID functions.
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The Base Memory Library provides optimized implementations for common memory-based operations.
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These functions should be used in place of coding your own loops to do equivalent common functions.
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This allows optimized library implementations to help increase performance.
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Copyright (c) 2006 - 2018, Intel Corporation. All rights reserved.<BR>
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This program and the accompanying materials are licensed and made available under
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the terms and conditions of the BSD License that accompanies this distribution.
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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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#ifndef __BASE_MEMORY_LIB__
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#define __BASE_MEMORY_LIB__
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/**
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Copies a source buffer to a destination buffer, and returns the destination buffer.
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This function copies Length bytes from SourceBuffer to DestinationBuffer, and returns
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DestinationBuffer. The implementation must be reentrant, and it must handle the case
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where SourceBuffer overlaps DestinationBuffer.
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If Length is greater than (MAX_ADDRESS - DestinationBuffer + 1), then ASSERT().
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If Length is greater than (MAX_ADDRESS - SourceBuffer + 1), then ASSERT().
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@param DestinationBuffer The pointer to the destination buffer of the memory copy.
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@param SourceBuffer The pointer to the source buffer of the memory copy.
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@param Length The number of bytes to copy from SourceBuffer to DestinationBuffer.
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@return DestinationBuffer.
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**/
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VOID *
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EFIAPI
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CopyMem (
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OUT VOID *DestinationBuffer,
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IN CONST VOID *SourceBuffer,
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IN UINTN Length
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);
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/**
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Fills a target buffer with a byte value, and returns the target buffer.
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This function fills Length bytes of Buffer with Value, and returns Buffer.
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If Length is greater than (MAX_ADDRESS - Buffer + 1), then ASSERT().
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@param Buffer The memory to set.
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@param Length The number of bytes to set.
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@param Value The value with which to fill Length bytes of Buffer.
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@return Buffer.
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**/
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VOID *
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EFIAPI
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SetMem (
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OUT VOID *Buffer,
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IN UINTN Length,
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IN UINT8 Value
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);
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/**
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Fills a target buffer with a 16-bit value, and returns the target buffer.
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This function fills Length bytes of Buffer with the 16-bit value specified by
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Value, and returns Buffer. Value is repeated every 16-bits in for Length
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bytes of Buffer.
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If Length > 0 and Buffer is NULL, then ASSERT().
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If Length is greater than (MAX_ADDRESS - Buffer + 1), then ASSERT().
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If Buffer is not aligned on a 16-bit boundary, then ASSERT().
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If Length is not aligned on a 16-bit boundary, then ASSERT().
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@param Buffer The pointer to the target buffer to fill.
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@param Length The number of bytes in Buffer to fill.
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@param Value The value with which to fill Length bytes of Buffer.
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@return Buffer.
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**/
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VOID *
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EFIAPI
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SetMem16 (
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OUT VOID *Buffer,
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IN UINTN Length,
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IN UINT16 Value
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);
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/**
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Fills a target buffer with a 32-bit value, and returns the target buffer.
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This function fills Length bytes of Buffer with the 32-bit value specified by
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Value, and returns Buffer. Value is repeated every 32-bits in for Length
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bytes of Buffer.
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If Length > 0 and Buffer is NULL, then ASSERT().
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If Length is greater than (MAX_ADDRESS - Buffer + 1), 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 32-bit boundary, then ASSERT().
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@param Buffer The pointer to the target buffer to fill.
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@param Length The number of bytes in Buffer to fill.
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@param Value The value with which to fill Length bytes of Buffer.
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@return Buffer.
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**/
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VOID *
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EFIAPI
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SetMem32 (
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OUT VOID *Buffer,
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IN UINTN Length,
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IN UINT32 Value
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);
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/**
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Fills a target buffer with a 64-bit value, and returns the target buffer.
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This function fills Length bytes of Buffer with the 64-bit value specified by
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Value, and returns Buffer. Value is repeated every 64-bits in for Length
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bytes of Buffer.
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If Length > 0 and Buffer is NULL, then ASSERT().
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If Length is greater than (MAX_ADDRESS - Buffer + 1), 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 not aligned on a 64-bit boundary, then ASSERT().
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@param Buffer The pointer to the target buffer to fill.
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@param Length The number of bytes in Buffer to fill.
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@param Value The value with which to fill Length bytes of Buffer.
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@return Buffer.
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**/
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VOID *
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EFIAPI
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SetMem64 (
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OUT VOID *Buffer,
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IN UINTN Length,
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IN UINT64 Value
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);
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/**
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Fills a target buffer with a value that is size UINTN, and returns the target buffer.
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This function fills Length bytes of Buffer with the UINTN sized value specified by
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Value, and returns Buffer. Value is repeated every sizeof(UINTN) bytes for Length
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bytes of Buffer.
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If Length > 0 and Buffer is NULL, then ASSERT().
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If Length is greater than (MAX_ADDRESS - Buffer + 1), then ASSERT().
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If Buffer is not aligned on a UINTN boundary, then ASSERT().
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If Length is not aligned on a UINTN boundary, then ASSERT().
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@param Buffer The pointer to the target buffer to fill.
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@param Length The number of bytes in Buffer to fill.
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@param Value The value with which to fill Length bytes of Buffer.
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@return Buffer.
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**/
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VOID *
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EFIAPI
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SetMemN (
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OUT VOID *Buffer,
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IN UINTN Length,
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IN UINTN Value
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);
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/**
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Fills a target buffer with zeros, and returns the target buffer.
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This function fills Length bytes of Buffer with zeros, and returns Buffer.
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If Length > 0 and Buffer is NULL, 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 fill with zeros.
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@param Length The number of bytes in Buffer to fill with zeros.
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@return Buffer.
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**/
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VOID *
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EFIAPI
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ZeroMem (
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OUT VOID *Buffer,
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IN UINTN Length
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);
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/**
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Compares the contents of two buffers.
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This function compares Length bytes of SourceBuffer to Length bytes of DestinationBuffer.
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If all Length bytes of the two buffers are identical, then 0 is returned. Otherwise, the
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value returned is the first mismatched byte in SourceBuffer subtracted from the first
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mismatched byte in DestinationBuffer.
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If Length > 0 and DestinationBuffer is NULL, then ASSERT().
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If Length > 0 and SourceBuffer is NULL, then ASSERT().
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If Length is greater than (MAX_ADDRESS - DestinationBuffer + 1), then ASSERT().
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If Length is greater than (MAX_ADDRESS - SourceBuffer + 1), then ASSERT().
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@param DestinationBuffer The pointer to the destination buffer to compare.
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@param SourceBuffer The pointer to the source buffer to compare.
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@param Length The number of bytes to compare.
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@return 0 All Length bytes of the two buffers are identical.
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@retval Non-zero The first mismatched byte in SourceBuffer subtracted from the first
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mismatched byte in DestinationBuffer.
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**/
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INTN
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EFIAPI
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CompareMem (
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IN CONST VOID *DestinationBuffer,
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IN CONST VOID *SourceBuffer,
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IN UINTN Length
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);
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/**
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Scans a target buffer for an 8-bit value, and returns a pointer to the matching 8-bit value
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in the target buffer.
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This function searches target the buffer specified by Buffer and Length from the lowest
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address to the highest address for an 8-bit value that matches Value. If a match is found,
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then a pointer to the matching byte 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 Length > 0 and Buffer is NULL, 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 Value The value to search for in the target buffer.
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@return A pointer to the matching byte in the target buffer, otherwise NULL.
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**/
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VOID *
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EFIAPI
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ScanMem8 (
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IN CONST VOID *Buffer,
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IN UINTN Length,
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IN UINT8 Value
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);
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/**
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Scans a target buffer for a 16-bit value, and returns a pointer to the matching 16-bit value
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in the target buffer.
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This function searches target the buffer specified by Buffer and Length from the lowest
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address to the highest address for a 16-bit value that matches Value. If a match is found,
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then a pointer to the matching byte 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 Length > 0 and Buffer is NULL, then ASSERT().
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If Buffer is not aligned on a 16-bit boundary, then ASSERT().
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If Length is not aligned on a 16-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 Value The value to search for in the target buffer.
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@return A pointer to the matching byte in the target buffer, otherwise NULL.
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**/
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VOID *
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EFIAPI
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ScanMem16 (
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IN CONST VOID *Buffer,
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IN UINTN Length,
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IN UINT16 Value
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);
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/**
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Scans a target buffer for a 32-bit value, and returns a pointer to the matching 32-bit value
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in the target buffer.
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This function searches target the buffer specified by Buffer and Length from the lowest
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address to the highest address for a 32-bit value that matches Value. If a match is found,
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then a pointer to the matching byte 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 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 32-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 Value The value to search for in the target buffer.
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@return A pointer to the matching byte in the target buffer, otherwise NULL.
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**/
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VOID *
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EFIAPI
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ScanMem32 (
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IN CONST VOID *Buffer,
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IN UINTN Length,
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IN UINT32 Value
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);
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/**
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Scans a target buffer for a 64-bit value, and returns a pointer to the matching 64-bit value
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in the target buffer.
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This function searches target the buffer specified by Buffer and Length from the lowest
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address to the highest address for a 64-bit value that matches Value. If a match is found,
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then a pointer to the matching byte 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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|
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If Length > 0 and Buffer is NULL, then ASSERT().
|
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|
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If Buffer is not aligned on a 64-bit boundary, then ASSERT().
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|
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If Length 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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|
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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 Value The value to search for in the target buffer.
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@return A pointer to the matching byte in the target buffer, otherwise NULL.
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|
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**/
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VOID *
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|
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EFIAPI
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|
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ScanMem64 (
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IN CONST VOID *Buffer,
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|
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IN UINTN Length,
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|
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IN UINT64 Value
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||
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);
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|
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/**
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Scans a target buffer for a UINTN sized value, and returns a pointer to the matching
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UINTN sized value in the target buffer.
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|
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|
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This function searches target the buffer specified by Buffer and Length from the lowest
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address to the highest address for a UINTN sized value that matches Value. If a match is found,
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|
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then a pointer to the matching byte 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.
|
||
|
|
|
||
|
|
If Length > 0 and Buffer is NULL, then ASSERT().
|
||
|
|
If Buffer is not aligned on a UINTN boundary, then ASSERT().
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||
|
|
If Length is not aligned on a UINTN boundary, then ASSERT().
|
||
|
|
If Length is greater than (MAX_ADDRESS - Buffer + 1), then ASSERT().
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|
||
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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 Value The value to search for in the target buffer.
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@return A pointer to the matching byte in the target buffer, otherwise NULL.
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**/
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VOID *
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EFIAPI
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ScanMemN (
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|
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IN CONST VOID *Buffer,
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|
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IN UINTN Length,
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IN UINTN Value
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||
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);
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|
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/**
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||
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Copies a source GUID to a destination GUID.
|
||
|
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|
||
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This function copies the contents of the 128-bit GUID specified by SourceGuid to
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|
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DestinationGuid, and returns DestinationGuid.
|
||
|
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|
||
|
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If DestinationGuid is NULL, then ASSERT().
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||
|
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If SourceGuid is NULL, then ASSERT().
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||
|
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|
||
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@param DestinationGuid The pointer to the destination GUID.
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||
|
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@param SourceGuid The pointer to the source GUID.
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||
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@return DestinationGuid.
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||
|
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|
||
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**/
|
||
|
|
GUID *
|
||
|
|
EFIAPI
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||
|
|
CopyGuid (
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||
|
|
OUT GUID *DestinationGuid,
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||
|
|
IN CONST GUID *SourceGuid
|
||
|
|
);
|
||
|
|
|
||
|
|
/**
|
||
|
|
Compares two GUIDs.
|
||
|
|
|
||
|
|
This function compares Guid1 to Guid2. If the GUIDs are identical then TRUE is returned.
|
||
|
|
If there are any bit differences in the two GUIDs, then FALSE is returned.
|
||
|
|
|
||
|
|
If Guid1 is NULL, then ASSERT().
|
||
|
|
If Guid2 is NULL, then ASSERT().
|
||
|
|
|
||
|
|
@param Guid1 A pointer to a 128 bit GUID.
|
||
|
|
@param Guid2 A pointer to a 128 bit GUID.
|
||
|
|
|
||
|
|
@retval TRUE Guid1 and Guid2 are identical.
|
||
|
|
@retval FALSE Guid1 and Guid2 are not identical.
|
||
|
|
|
||
|
|
**/
|
||
|
|
BOOLEAN
|
||
|
|
EFIAPI
|
||
|
|
CompareGuid (
|
||
|
|
IN CONST GUID *Guid1,
|
||
|
|
IN CONST GUID *Guid2
|
||
|
|
);
|
||
|
|
|
||
|
|
/**
|
||
|
|
Scans a target buffer for a GUID, and returns a pointer to the matching GUID
|
||
|
|
in the target buffer.
|
||
|
|
|
||
|
|
This function searches target the buffer specified by Buffer and Length from
|
||
|
|
the lowest address to the highest address at 128-bit increments for the 128-bit
|
||
|
|
GUID value that matches Guid. If a match is found, then a pointer to the matching
|
||
|
|
GUID in the target buffer is returned. If no match is found, then NULL is returned.
|
||
|
|
If Length is 0, then NULL is returned.
|
||
|
|
|
||
|
|
If Length > 0 and Buffer is NULL, then ASSERT().
|
||
|
|
If Buffer is not aligned on a 32-bit boundary, then ASSERT().
|
||
|
|
If Length is not aligned on a 128-bit boundary, then ASSERT().
|
||
|
|
If Length is greater than (MAX_ADDRESS - Buffer + 1), then ASSERT().
|
||
|
|
|
||
|
|
@param Buffer The pointer to the target buffer to scan.
|
||
|
|
@param Length The number of bytes in Buffer to scan.
|
||
|
|
@param Guid The value to search for in the target buffer.
|
||
|
|
|
||
|
|
@return A pointer to the matching Guid in the target buffer, otherwise NULL.
|
||
|
|
|
||
|
|
**/
|
||
|
|
VOID *
|
||
|
|
EFIAPI
|
||
|
|
ScanGuid (
|
||
|
|
IN CONST VOID *Buffer,
|
||
|
|
IN UINTN Length,
|
||
|
|
IN CONST GUID *Guid
|
||
|
|
);
|
||
|
|
|
||
|
|
/**
|
||
|
|
Checks if the given GUID is a zero GUID.
|
||
|
|
|
||
|
|
This function checks whether the given GUID is a zero GUID. If the GUID is
|
||
|
|
identical to a zero GUID then TRUE is returned. Otherwise, FALSE is returned.
|
||
|
|
|
||
|
|
If Guid is NULL, then ASSERT().
|
||
|
|
|
||
|
|
@param Guid The pointer to a 128 bit GUID.
|
||
|
|
|
||
|
|
@retval TRUE Guid is a zero GUID.
|
||
|
|
@retval FALSE Guid is not a zero GUID.
|
||
|
|
|
||
|
|
**/
|
||
|
|
BOOLEAN
|
||
|
|
EFIAPI
|
||
|
|
IsZeroGuid (
|
||
|
|
IN CONST GUID *Guid
|
||
|
|
);
|
||
|
|
|
||
|
|
/**
|
||
|
|
Checks if the contents of a buffer are all zeros.
|
||
|
|
|
||
|
|
This function checks whether the contents of a buffer are all zeros. If the
|
||
|
|
contents are all zeros, return TRUE. Otherwise, return FALSE.
|
||
|
|
|
||
|
|
If Length > 0 and Buffer is NULL, then ASSERT().
|
||
|
|
If Length is greater than (MAX_ADDRESS - Buffer + 1), then ASSERT().
|
||
|
|
|
||
|
|
@param Buffer The pointer to the buffer to be checked.
|
||
|
|
@param Length The size of the buffer (in bytes) to be checked.
|
||
|
|
|
||
|
|
@retval TRUE Contents of the buffer are all zeros.
|
||
|
|
@retval FALSE Contents of the buffer are not all zeros.
|
||
|
|
|
||
|
|
**/
|
||
|
|
BOOLEAN
|
||
|
|
EFIAPI
|
||
|
|
IsZeroBuffer (
|
||
|
|
IN CONST VOID *Buffer,
|
||
|
|
IN UINTN Length
|
||
|
|
);
|
||
|
|
|
||
|
|
#endif
|