MemLibGeneric.c

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#include "MemLibInternals.h"
 
VOID *
EFIAPI
InternalMemSetMem16 (
  OUT     VOID    *Buffer,
  IN      UINTN   Length,
  IN      UINT16  Value
  )
{
  for ( ; Length != 0; Length--) {
    ((UINT16 *)Buffer)[Length - 1] = Value;
  }
 
  return Buffer;
}
 
VOID *
EFIAPI
InternalMemSetMem32 (
  OUT     VOID    *Buffer,
  IN      UINTN   Length,
  IN      UINT32  Value
  )
{
  for ( ; Length != 0; Length--) {
    ((UINT32 *)Buffer)[Length - 1] = Value;
  }
 
  return Buffer;
}
 
VOID *
EFIAPI
InternalMemSetMem64 (
  OUT     VOID    *Buffer,
  IN      UINTN   Length,
  IN      UINT64  Value
  )
{
  for ( ; Length != 0; Length--) {
    ((UINT64 *)Buffer)[Length - 1] = Value;
  }
 
  return Buffer;
}
 
VOID *
EFIAPI
InternalMemZeroMem (
  OUT     VOID   *Buffer,
  IN      UINTN  Length
  )
{
  return InternalMemSetMem (Buffer, Length, 0);
}
 
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;
}
 
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;
}
 
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;
}
 
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;
}
 
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;
}
 
BOOLEAN
EFIAPI
InternalMemIsZeroBuffer (
  IN CONST VOID  *Buffer,
  IN UINTN       Length
  )
{
  CONST UINT8  *BufferData;
  UINTN        Index;
 
  BufferData = Buffer;
  for (Index = 0; Index < Length; Index++) {
    if (BufferData[Index] != 0) {
      return FALSE;
    }
  }
 
  return TRUE;
}