MdePkg: Replace BSD License with BSD+Patent License

[mirror_edk2.git] / MdePkg / Library / BaseMemoryLibOptDxe / Arm / ScanMemGeneric.c

/** @file\r
  Architecture Independent Base Memory Library Implementation.\r
\r
  The following BaseMemoryLib instances contain the same copy of this file:\r
    BaseMemoryLib\r
    PeiMemoryLib\r
    UefiMemoryLib\r
\r
  Copyright (c) 2006 - 2016, Intel Corporation. All rights reserved.<BR>\r
  SPDX-License-Identifier: BSD-2-Clause-Patent\r
\r
**/\r
\r
#include "../MemLibInternals.h"\r
\r
/**\r
  Scans a target buffer for a 16-bit value, and returns a pointer to the\r
  matching 16-bit value in the target buffer.\r
\r
  @param  Buffer  The pointer to the target buffer to scan.\r
  @param  Length  The count of 16-bit value to scan. Must be non-zero.\r
  @param  Value   The value to search for in the target buffer.\r
\r
  @return The pointer to the first occurrence, or NULL if not found.\r
\r
**/\r
CONST VOID *\r
EFIAPI\r
InternalMemScanMem16 (\r
  IN      CONST VOID                *Buffer,\r
  IN      UINTN                     Length,\r
  IN      UINT16                    Value\r
  )\r
{\r
  CONST UINT16                      *Pointer;\r
\r
  Pointer = (CONST UINT16*)Buffer;\r
  do {\r
    if (*Pointer == Value) {\r
      return Pointer;\r
    }\r
    ++Pointer;\r
  } while (--Length != 0);\r
  return NULL;\r
}\r
\r
/**\r
  Scans a target buffer for a 32-bit value, and returns a pointer to the\r
  matching 32-bit value in the target buffer.\r
\r
  @param  Buffer  The pointer to the target buffer to scan.\r
  @param  Length  The count of 32-bit value to scan. Must be non-zero.\r
  @param  Value   The value to search for in the target buffer.\r
\r
  @return The pointer to the first occurrence, or NULL if not found.\r
\r
**/\r
CONST VOID *\r
EFIAPI\r
InternalMemScanMem32 (\r
  IN      CONST VOID                *Buffer,\r
  IN      UINTN                     Length,\r
  IN      UINT32                    Value\r
  )\r
{\r
  CONST UINT32                      *Pointer;\r
\r
  Pointer = (CONST UINT32*)Buffer;\r
  do {\r
    if (*Pointer == Value) {\r
      return Pointer;\r
    }\r
    ++Pointer;\r
  } while (--Length != 0);\r
  return NULL;\r
}\r
\r
/**\r
  Scans a target buffer for a 64-bit value, and returns a pointer to the\r
  matching 64-bit value in the target buffer.\r
\r
  @param  Buffer  The pointer to the target buffer to scan.\r
  @param  Length  The count of 64-bit value to scan. Must be non-zero.\r
  @param  Value   The value to search for in the target buffer.\r
\r
  @return The pointer to the first occurrence, or NULL if not found.\r
\r
**/\r
CONST VOID *\r
EFIAPI\r
InternalMemScanMem64 (\r
  IN      CONST VOID                *Buffer,\r
  IN      UINTN                     Length,\r
  IN      UINT64                    Value\r
  )\r
{\r
  CONST UINT64                      *Pointer;\r
\r
  Pointer = (CONST UINT64*)Buffer;\r
  do {\r
    if (*Pointer == Value) {\r
      return Pointer;\r
    }\r
    ++Pointer;\r
  } while (--Length != 0);\r
  return NULL;\r
}\r
\r
/**\r
  Checks whether the contents of a buffer are all zeros.\r
\r
  @param  Buffer  The pointer to the buffer to be checked.\r
  @param  Length  The size of the buffer (in bytes) to be checked.\r
\r
  @retval TRUE    Contents of the buffer are all zeros.\r
  @retval FALSE   Contents of the buffer are not all zeros.\r
\r
**/\r
BOOLEAN\r
EFIAPI\r
InternalMemIsZeroBuffer (\r
  IN CONST VOID  *Buffer,\r
  IN UINTN       Length\r
  )\r
{\r
  CONST UINT8 *BufferData;\r
  UINTN       Index;\r
\r
  BufferData = Buffer;\r
  for (Index = 0; Index < Length; Index++) {\r
    if (BufferData[Index] != 0) {\r
      return FALSE;\r
    }\r
  }\r
  return TRUE;\r
}\r