text: /** @file
    Architecture Independent Base Memory Library Implementation.
  
    The following BaseMemoryLib instances contain the same copy of this file:
      BaseMemoryLib
      PeiMemoryLib
      UefiMemoryLib
  
    Copyright (c) 2006 - 2010, Intel Corporation. All rights reserved.<BR>
    This program and the accompanying materials
    are licensed and made available under the terms and conditions of the BSD License
    which accompanies this distribution.  The full text of the license may be found at
    http://opensource.org/licenses/bsd-license.php.
  
    THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
    WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  
  **/
  
  #include "MemLibInternals.h"
  
  /**
    Fills a target buffer with a 16-bit value, and returns the target buffer.
  
    @param  Buffer  The pointer to the target buffer to fill.
    @param  Length  The count of 16-bit value to fill.
    @param  Value   The value with which to fill Length bytes of Buffer.
  
    @return Buffer
  
  **/
  VOID *
  EFIAPI
  InternalMemSetMem16 (
    OUT     VOID                      *Buffer,
    IN      UINTN                     Length,
    IN      UINT16                    Value
    )
  {
    do {
      ((UINT16*)Buffer)[--Length] = Value;
    } while (Length != 0);
    return Buffer;
  }
  
  /**
    Fills a target buffer with a 32-bit value, and returns the target buffer.
  
    @param  Buffer  The pointer to the target buffer to fill.
    @param  Length  The count of 32-bit value to fill.
    @param  Value   The value with which to fill Length bytes of Buffer.
  
    @return Buffer
  
  **/
  VOID *
  EFIAPI
  InternalMemSetMem32 (
    OUT     VOID                      *Buffer,
    IN      UINTN                     Length,
    IN      UINT32                    Value
    )
  {
    do {
      ((UINT32*)Buffer)[--Length] = Value;
    } while (Length != 0);
    return Buffer;
  }
  
  /**
    Fills a target buffer with a 64-bit value, and returns the target buffer.
  
    @param  Buffer  The pointer to the target buffer to fill.
    @param  Length  The count of 64-bit value to fill.
    @param  Value   The value with which to fill Length bytes of Buffer.
  
    @return Buffer
  
  **/
  VOID *
  EFIAPI
  InternalMemSetMem64 (
    OUT     VOID                      *Buffer,
    IN      UINTN                     Length,
    IN      UINT64                    Value
    )
  {
    do {
      ((UINT64*)Buffer)[--Length] = Value;
    } while (Length != 0);
    return Buffer;
  }
  
  /**
    Set Buffer to 0 for Size bytes.
  
    @param  Buffer Memory to set.
    @param  Length The number of bytes to set
  
    @return Buffer
  
  **/
  VOID *
  EFIAPI
  InternalMemZeroMem (
    OUT     VOID                      *Buffer,
    IN      UINTN                     Length
    )
  {
    return InternalMemSetMem (Buffer, Length, 0);
  }
  
  /**
    Compares two memory buffers of a given length.
  
    @param  DestinationBuffer The first memory buffer
    @param  SourceBuffer      The second memory buffer
    @param  Length            The length of DestinationBuffer and SourceBuffer memory
                              regions to compare. Must be non-zero.
  
    @return 0                 All Length bytes of the two buffers are identical.
    @retval Non-zero          The first mismatched byte in SourceBuffer subtracted from the first
                              mismatched byte in DestinationBuffer.
  
  **/
  INTN
  EFIAPI
  InternalMemCompareMem (
    IN      CONST VOID                *DestinationBuffer,
    IN      CONST VOID                *SourceBuffer,
    IN      UINTN                     Length
    )
  {
    while ((--Length != 0) &&
           (*(INT8*)DestinationBuffer == *(INT8*)SourceBuffer)) {
      DestinationBuffer = (INT8*)DestinationBuffer + 1;
      SourceBuffer = (INT8*)SourceBuffer + 1;
    }
    return (INTN)*(UINT8*)DestinationBuffer - (INTN)*(UINT8*)SourceBuffer;
  }
  
  /**
    Scans a target buffer for an 8-bit value, and returns a pointer to the
    matching 8-bit value in the target buffer.
  
    @param  Buffer  The pointer to the target buffer to scan.
    @param  Length  The count of 8-bit value to scan. Must be non-zero.
    @param  Value   The value to search for in the target buffer.
  
    @return The pointer to the first occurrence or NULL if not found.
  
  **/
  CONST VOID *
  EFIAPI
  InternalMemScanMem8 (
    IN      CONST VOID                *Buffer,
    IN      UINTN                     Length,
    IN      UINT8                     Value
    )
  {
    CONST UINT8                       *Pointer;
  
    Pointer = (CONST UINT8*)Buffer;
    do {
      if (*(Pointer++) == Value) {
        return --Pointer;
      }
    } while (--Length != 0);
    return NULL;
  }
  
  /**
    Scans a target buffer for a 16-bit value, and returns a pointer to the
    matching 16-bit value in the target buffer.
  
    @param  Buffer  The pointer to the target buffer to scan.
    @param  Length  The count of 16-bit value to scan. Must be non-zero.
    @param  Value   The value to search for in the target buffer.
  
    @return The pointer to the first occurrence or NULL if not found.
  
  **/
  CONST VOID *
  EFIAPI
  InternalMemScanMem16 (
    IN      CONST VOID                *Buffer,
    IN      UINTN                     Length,
    IN      UINT16                    Value
    )
  {
    CONST UINT16                      *Pointer;
  
    Pointer = (CONST UINT16*)Buffer;
    do {
      if (*(Pointer++) == Value) {
        return --Pointer;
      }
    } while (--Length != 0);
    return NULL;
  }
  
  /**
    Scans a target buffer for a 32-bit value, and returns a pointer to the
    matching 32-bit value in the target buffer.
  
    @param  Buffer  The pointer to the target buffer to scan.
    @param  Length  The count of 32-bit value to scan. Must be non-zero.
    @param  Value   The value to search for in the target buffer.
  
    @return The pointer to the first occurrence or NULL if not found.
  
  **/
  CONST VOID *
  EFIAPI
  InternalMemScanMem32 (
    IN      CONST VOID                *Buffer,
    IN      UINTN                     Length,
    IN      UINT32                    Value
    )
  {
    CONST UINT32                      *Pointer;
  
    Pointer = (CONST UINT32*)Buffer;
    do {
      if (*(Pointer++) == Value) {
        return --Pointer;
      }
    } while (--Length != 0);
    return NULL;
  }
  
  /**
    Scans a target buffer for a 64-bit value, and returns a pointer to the
    matching 64-bit value in the target buffer.
  
    @param  Buffer  The pointer to the target buffer to scan.
    @param  Length  The count of 64-bit value to scan. Must be non-zero.
    @param  Value   The value to search for in the target buffer.
  
    @return The pointer to the first occurrence or NULL if not found.
  
  **/
  CONST VOID *
  EFIAPI
  InternalMemScanMem64 (
    IN      CONST VOID                *Buffer,
    IN      UINTN                     Length,
    IN      UINT64                    Value
    )
  {
    CONST UINT64                      *Pointer;
  
    Pointer = (CONST UINT64*)Buffer;
    do {
      if (*(Pointer++) == Value) {
        return --Pointer;
      }
    } while (--Length != 0);
    return NULL;
  }
  