SafeIntLib32.c

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#include <Base.h>
#include <Library/SafeIntLib.h>
#include <Library/BaseLib.h>
 
RETURN_STATUS
EFIAPI
SafeInt32ToUintn (
  IN  INT32  Operand,
  OUT UINTN  *Result
  )
{
  return SafeInt32ToUint32 (Operand, (UINT32 *)Result);
}
 
RETURN_STATUS
EFIAPI
SafeUint32ToIntn (
  IN  UINT32  Operand,
  OUT INTN    *Result
  )
{
  return SafeUint32ToInt32 (Operand, (INT32 *)Result);
}
 
RETURN_STATUS
EFIAPI
SafeIntnToInt32 (
  IN  INTN   Operand,
  OUT INT32  *Result
  )
{
  if (Result == NULL) {
    return RETURN_INVALID_PARAMETER;
  }
 
  *Result = (INT32)Operand;
  return RETURN_SUCCESS;
}
 
RETURN_STATUS
EFIAPI
SafeIntnToUint32 (
  IN  INTN    Operand,
  OUT UINT32  *Result
  )
{
  RETURN_STATUS  Status;
 
  if (Result == NULL) {
    return RETURN_INVALID_PARAMETER;
  }
 
  if (Operand >= 0) {
    *Result = (UINT32)Operand;
    Status  = RETURN_SUCCESS;
  } else {
    *Result = UINT32_ERROR;
    Status  = RETURN_BUFFER_TOO_SMALL;
  }
 
  return Status;
}
 
RETURN_STATUS
EFIAPI
SafeUintnToUint32 (
  IN  UINTN   Operand,
  OUT UINT32  *Result
  )
{
  if (Result == NULL) {
    return RETURN_INVALID_PARAMETER;
  }
 
  *Result = (UINT32)Operand;
  return RETURN_SUCCESS;
}
 
RETURN_STATUS
EFIAPI
SafeUintnToInt64 (
  IN  UINTN  Operand,
  OUT INT64  *Result
  )
{
  if (Result == NULL) {
    return RETURN_INVALID_PARAMETER;
  }
 
  *Result = (INT64)Operand;
  return RETURN_SUCCESS;
}
 
RETURN_STATUS
EFIAPI
SafeInt64ToIntn (
  IN  INT64  Operand,
  OUT INTN   *Result
  )
{
  return SafeInt64ToInt32 (Operand, (INT32 *)Result);
}
 
RETURN_STATUS
EFIAPI
SafeInt64ToUintn (
  IN  INT64  Operand,
  OUT UINTN  *Result
  )
{
  return SafeInt64ToUint32 (Operand, (UINT32 *)Result);
}
 
RETURN_STATUS
EFIAPI
SafeUint64ToUintn (
  IN  UINT64  Operand,
  OUT UINTN   *Result
  )
{
  return SafeUint64ToUint32 ((UINT64)Operand, (UINT32 *)Result);
}
 
RETURN_STATUS
EFIAPI
SafeUintnAdd (
  IN  UINTN  Augend,
  IN  UINTN  Addend,
  OUT UINTN  *Result
  )
{
  RETURN_STATUS  Status;
 
  if (Result == NULL) {
    return RETURN_INVALID_PARAMETER;
  }
 
  if ((Augend + Addend) >= Augend) {
    *Result = (Augend + Addend);
    Status  = RETURN_SUCCESS;
  } else {
    *Result = UINTN_ERROR;
    Status  = RETURN_BUFFER_TOO_SMALL;
  }
 
  return Status;
}
 
RETURN_STATUS
EFIAPI
SafeUintnSub (
  IN  UINTN  Minuend,
  IN  UINTN  Subtrahend,
  OUT UINTN  *Result
  )
{
  RETURN_STATUS  Status;
 
  if (Result == NULL) {
    return RETURN_INVALID_PARAMETER;
  }
 
  if (Minuend >= Subtrahend) {
    *Result = (Minuend - Subtrahend);
    Status  = RETURN_SUCCESS;
  } else {
    *Result = UINTN_ERROR;
    Status  = RETURN_BUFFER_TOO_SMALL;
  }
 
  return Status;
}
 
RETURN_STATUS
EFIAPI
SafeUintnMult (
  IN  UINTN  Multiplicand,
  IN  UINTN  Multiplier,
  OUT UINTN  *Result
  )
{
  UINT64  IntermediateResult;
 
  IntermediateResult = ((UINT64)Multiplicand) *((UINT64)Multiplier);
 
  return SafeUint64ToUintn (IntermediateResult, Result);
}
 
RETURN_STATUS
EFIAPI
SafeIntnAdd (
  IN  INTN  Augend,
  IN  INTN  Addend,
  OUT INTN  *Result
  )
{
  return SafeInt64ToIntn (((INT64)Augend) + ((INT64)Addend), Result);
}
 
RETURN_STATUS
EFIAPI
SafeIntnSub (
  IN  INTN  Minuend,
  IN  INTN  Subtrahend,
  OUT INTN  *Result
  )
{
  return SafeInt64ToIntn (((INT64)Minuend) - ((INT64)Subtrahend), Result);
}
 
RETURN_STATUS
EFIAPI
SafeIntnMult (
  IN  INTN  Multiplicand,
  IN  INTN  Multiplier,
  OUT INTN  *Result
  )
{
  return SafeInt64ToIntn (MultS64x64 (Multiplicand, Multiplier), Result);
}