/** @file
  IA32-specific functions for unit-testing INTN and UINTN functions in
  SafeIntLib.

  Copyright (c) Microsoft Corporation.<BR>
  Copyright (c) 2019 - 2020, Intel Corporation. All rights reserved.<BR>
  SPDX-License-Identifier: BSD-2-Clause-Patent

**/

#include "TestBaseSafeIntLib.h"

UNIT_TEST_STATUS
EFIAPI
TestSafeInt32ToUintn (
  IN UNIT_TEST_CONTEXT  Context
  )
{
  EFI_STATUS  Status;
  INT32       Operand;
  UINTN       Result;

  //
  // If Operand is non-negative, then it's a cast
  //
  Operand = 0x5bababab;
  Result  = 0;
  Status  = SafeInt32ToUintn (Operand, &Result);
  UT_ASSERT_NOT_EFI_ERROR (Status);
  UT_ASSERT_EQUAL (0x5bababab, Result);

  //
  // Otherwise should result in an error status
  //
  Operand = (-1537977259);
  Status  = SafeInt32ToUintn (Operand, &Result);
  UT_ASSERT_EQUAL (RETURN_BUFFER_TOO_SMALL, Status);

  return UNIT_TEST_PASSED;
}

UNIT_TEST_STATUS
EFIAPI
TestSafeUint32ToIntn (
  IN UNIT_TEST_CONTEXT  Context
  )
{
  EFI_STATUS  Status;
  UINT32      Operand;
  INTN        Result;

  //
  // If Operand is <= MAX_INTN, then it's a cast
  //
  Operand = 0x5bababab;
  Result  = 0;
  Status  = SafeUint32ToIntn (Operand, &Result);
  UT_ASSERT_NOT_EFI_ERROR (Status);
  UT_ASSERT_EQUAL (0x5bababab, Result);

  //
  // Otherwise should result in an error status
  //
  Operand = (0xabababab);
  Status  = SafeUint32ToIntn (Operand, &Result);
  UT_ASSERT_EQUAL (RETURN_BUFFER_TOO_SMALL, Status);

  return UNIT_TEST_PASSED;
}

UNIT_TEST_STATUS
EFIAPI
TestSafeIntnToInt32 (
  IN UNIT_TEST_CONTEXT  Context
  )
{
  EFI_STATUS  Status;
  INTN        Operand;
  INT32       Result;

  //
  // INTN is same as INT32 in IA32, so this is just a cast
  //
  Operand = 0x5bababab;
  Result  = 0;
  Status  = SafeIntnToInt32 (Operand, &Result);
  UT_ASSERT_NOT_EFI_ERROR (Status);
  UT_ASSERT_EQUAL (0x5bababab, Result);

  return UNIT_TEST_PASSED;
}

UNIT_TEST_STATUS
EFIAPI
TestSafeIntnToUint32 (
  IN UNIT_TEST_CONTEXT  Context
  )
{
  EFI_STATUS  Status;
  INTN        Operand;
  UINT32      Result;

  //
  // If Operand is non-negative, then it's a cast
  //
  Operand = 0x5bababab;
  Result  = 0;
  Status  = SafeIntnToUint32 (Operand, &Result);
  UT_ASSERT_NOT_EFI_ERROR (Status);
  UT_ASSERT_EQUAL (0x5bababab, Result);

  //
  // Otherwise should result in an error status
  //
  Operand = (-1537977259);
  Status  = SafeIntnToUint32 (Operand, &Result);
  UT_ASSERT_EQUAL (RETURN_BUFFER_TOO_SMALL, Status);

  return UNIT_TEST_PASSED;
}

UNIT_TEST_STATUS
EFIAPI
TestSafeUintnToUint32 (
  IN UNIT_TEST_CONTEXT  Context
  )
{
  EFI_STATUS  Status;
  UINTN       Operand;
  UINT32      Result;

  //
  // UINTN is same as UINT32 in IA32, so this is just a cast
  //
  Operand = 0xabababab;
  Result  = 0;
  Status  = SafeUintnToUint32 (Operand, &Result);
  UT_ASSERT_NOT_EFI_ERROR (Status);
  UT_ASSERT_EQUAL (0xabababab, Result);

  return UNIT_TEST_PASSED;
}

UNIT_TEST_STATUS
EFIAPI
TestSafeUintnToIntn (
  IN UNIT_TEST_CONTEXT  Context
  )
{
  EFI_STATUS  Status;
  UINTN       Operand;
  INTN        Result;

  //
  // If Operand is <= MAX_INTN, then it's a cast
  //
  Operand = 0x5bababab;
  Result  = 0;
  Status  = SafeUintnToIntn (Operand, &Result);
  UT_ASSERT_NOT_EFI_ERROR (Status);
  UT_ASSERT_EQUAL (0x5bababab, Result);

  //
  // Otherwise should result in an error status
  //
  Operand = (0xabababab);
  Status  = SafeUintnToIntn (Operand, &Result);
  UT_ASSERT_EQUAL (RETURN_BUFFER_TOO_SMALL, Status);

  return UNIT_TEST_PASSED;
}

UNIT_TEST_STATUS
EFIAPI
TestSafeUintnToInt64 (
  IN UNIT_TEST_CONTEXT  Context
  )
{
  EFI_STATUS  Status;
  UINTN       Operand;
  INT64       Result;

  //
  // UINTN is same as UINT32 in IA32, and UINT32 is a subset of
  // INT64, so this is just a cast
  //
  Operand = 0xabababab;
  Result  = 0;
  Status  = SafeUintnToInt64 (Operand, &Result);
  UT_ASSERT_NOT_EFI_ERROR (Status);
  UT_ASSERT_EQUAL (0xabababab, Result);

  return UNIT_TEST_PASSED;
}

UNIT_TEST_STATUS
EFIAPI
TestSafeInt64ToIntn (
  IN UNIT_TEST_CONTEXT  Context
  )
{
  EFI_STATUS  Status;
  INT64       Operand;
  INTN        Result;

  //
  // If Operand is between MIN_INTN and  MAX_INTN2 inclusive, then it's a cast
  //
  Operand = 0x5bababab;
  Result  = 0;
  Status  = SafeInt64ToIntn (Operand, &Result);
  UT_ASSERT_NOT_EFI_ERROR (Status);
  UT_ASSERT_EQUAL (0x5bababab, Result);

  Operand = (-1537977259);
  Status  = SafeInt64ToIntn (Operand, &Result);
  UT_ASSERT_NOT_EFI_ERROR (Status);
  UT_ASSERT_EQUAL ((-1537977259), Result);

  //
  // Otherwise should result in an error status
  //
  Operand = (0x5babababefefefef);
  Status  = SafeInt64ToIntn (Operand, &Result);
  UT_ASSERT_EQUAL (RETURN_BUFFER_TOO_SMALL, Status);

  Operand =  (-6605562033422200815);
  Status  = SafeInt64ToIntn (Operand, &Result);
  UT_ASSERT_EQUAL (RETURN_BUFFER_TOO_SMALL, Status);

  return UNIT_TEST_PASSED;
}

UNIT_TEST_STATUS
EFIAPI
TestSafeInt64ToUintn (
  IN UNIT_TEST_CONTEXT  Context
  )
{
  EFI_STATUS  Status;
  INT64       Operand;
  UINTN       Result;

  //
  // If Operand is between 0 and  MAX_UINTN inclusive, then it's a cast
  //
  Operand = 0xabababab;
  Result  = 0;
  Status  = SafeInt64ToUintn (Operand, &Result);
  UT_ASSERT_NOT_EFI_ERROR (Status);
  UT_ASSERT_EQUAL (0xabababab, Result);

  //
  // Otherwise should result in an error status
  //
  Operand = (0x5babababefefefef);
  Status  = SafeInt64ToUintn (Operand, &Result);
  UT_ASSERT_EQUAL (RETURN_BUFFER_TOO_SMALL, Status);

  Operand =  (-6605562033422200815);
  Status  = SafeInt64ToUintn (Operand, &Result);
  UT_ASSERT_EQUAL (RETURN_BUFFER_TOO_SMALL, Status);

  return UNIT_TEST_PASSED;
}

UNIT_TEST_STATUS
EFIAPI
TestSafeUint64ToIntn (
  IN UNIT_TEST_CONTEXT  Context
  )
{
  EFI_STATUS  Status;
  UINT64      Operand;
  INTN        Result;

  //
  // If Operand is <= MAX_INTN, then it's a cast
  //
  Operand = 0x5bababab;
  Result  = 0;
  Status  = SafeUint64ToIntn (Operand, &Result);
  UT_ASSERT_NOT_EFI_ERROR (Status);
  UT_ASSERT_EQUAL (0x5bababab, Result);

  //
  // Otherwise should result in an error status
  //
  Operand = (0xababababefefefef);
  Status  = SafeUint64ToIntn (Operand, &Result);
  UT_ASSERT_EQUAL (RETURN_BUFFER_TOO_SMALL, Status);

  return UNIT_TEST_PASSED;
}

UNIT_TEST_STATUS
EFIAPI
TestSafeUint64ToUintn (
  IN UNIT_TEST_CONTEXT  Context
  )
{
  EFI_STATUS  Status;
  UINT64      Operand;
  UINTN       Result;

  //
  // If Operand is <= MAX_UINTN, then it's a cast
  //
  Operand = 0xabababab;
  Result  = 0;
  Status  = SafeUint64ToUintn (Operand, &Result);
  UT_ASSERT_NOT_EFI_ERROR (Status);
  UT_ASSERT_EQUAL (0xabababab, Result);

  //
  // Otherwise should result in an error status
  //
  Operand = (0xababababefefefef);
  Status  = SafeUint64ToUintn (Operand, &Result);
  UT_ASSERT_EQUAL (RETURN_BUFFER_TOO_SMALL, Status);

  return UNIT_TEST_PASSED;
}

UNIT_TEST_STATUS
EFIAPI
TestSafeUintnAdd (
  IN UNIT_TEST_CONTEXT  Context
  )
{
  EFI_STATUS  Status;
  UINTN       Augend;
  UINTN       Addend;
  UINTN       Result;

  //
  // If the result of addition doesn't overflow MAX_UINTN, then it's addition
  //
  Augend = 0x3a3a3a3a;
  Addend = 0x3a3a3a3a;
  Result = 0;
  Status = SafeUintnAdd (Augend, Addend, &Result);
  UT_ASSERT_NOT_EFI_ERROR (Status);
  UT_ASSERT_EQUAL (0x74747474, Result);

  //
  // Otherwise should result in an error status
  //
  Augend = 0xabababab;
  Addend = 0xbcbcbcbc;
  Status = SafeUintnAdd (Augend, Addend, &Result);
  UT_ASSERT_EQUAL (RETURN_BUFFER_TOO_SMALL, Status);

  return UNIT_TEST_PASSED;
}

UNIT_TEST_STATUS
EFIAPI
TestSafeIntnAdd (
  IN UNIT_TEST_CONTEXT  Context
  )
{
  EFI_STATUS  Status;
  INTN        Augend;
  INTN        Addend;
  INTN        Result;

  //
  // If the result of addition doesn't overflow MAX_INTN
  // and doesn't underflow MIN_INTN, then it's addition
  //
  Augend = 0x3a3a3a3a;
  Addend = 0x3a3a3a3a;
  Result = 0;
  Status = SafeIntnAdd (Augend, Addend, &Result);
  UT_ASSERT_NOT_EFI_ERROR (Status);
  UT_ASSERT_EQUAL (0x74747474, Result);

  Augend = (-976894522);
  Addend = (-976894522);
  Status = SafeIntnAdd (Augend, Addend, &Result);
  UT_ASSERT_NOT_EFI_ERROR (Status);
  UT_ASSERT_EQUAL ((-1953789044), Result);

  //
  // Otherwise should result in an error status
  //
  Augend = 0x5a5a5a5a;
  Addend = 0x5a5a5a5a;
  Status = SafeIntnAdd (Augend, Addend, &Result);
  UT_ASSERT_EQUAL (RETURN_BUFFER_TOO_SMALL, Status);

  Augend = (-1515870810);
  Addend = (-1515870810);
  Status = SafeIntnAdd (Augend, Addend, &Result);
  UT_ASSERT_EQUAL (RETURN_BUFFER_TOO_SMALL, Status);

  return UNIT_TEST_PASSED;
}

UNIT_TEST_STATUS
EFIAPI
TestSafeUintnSub (
  IN UNIT_TEST_CONTEXT  Context
  )
{
  EFI_STATUS  Status;
  UINTN       Minuend;
  UINTN       Subtrahend;
  UINTN       Result;

  //
  // If Minuend >= Subtrahend, then it's subtraction
  //
  Minuend    = 0x5a5a5a5a;
  Subtrahend = 0x3b3b3b3b;
  Result     = 0;
  Status     = SafeUintnSub (Minuend, Subtrahend, &Result);
  UT_ASSERT_NOT_EFI_ERROR (Status);
  UT_ASSERT_EQUAL (0x1f1f1f1f, Result);

  //
  // Otherwise should result in an error status
  //
  Minuend    = 0x5a5a5a5a;
  Subtrahend = 0x6d6d6d6d;
  Status     = SafeUintnSub (Minuend, Subtrahend, &Result);
  UT_ASSERT_EQUAL (RETURN_BUFFER_TOO_SMALL, Status);

  return UNIT_TEST_PASSED;
}

UNIT_TEST_STATUS
EFIAPI
TestSafeIntnSub (
  IN UNIT_TEST_CONTEXT  Context
  )
{
  EFI_STATUS  Status;
  INTN        Minuend;
  INTN        Subtrahend;
  INTN        Result;

  //
  // If the result of subtractions doesn't overflow MAX_INTN or
  // underflow MIN_INTN, then it's subtraction
  //
  Minuend    = 0x5a5a5a5a;
  Subtrahend = 0x3a3a3a3a;
  Result     = 0;
  Status     = SafeIntnSub (Minuend, Subtrahend, &Result);
  UT_ASSERT_NOT_EFI_ERROR (Status);
  UT_ASSERT_EQUAL (0x20202020, Result);

  Minuend    = 0x3a3a3a3a;
  Subtrahend = 0x5a5a5a5a;
  Status     = SafeIntnSub (Minuend, Subtrahend, &Result);
  UT_ASSERT_NOT_EFI_ERROR (Status);
  UT_ASSERT_EQUAL ((-538976288), Result);

  //
  // Otherwise should result in an error status
  //
  Minuend    = (-2054847098);
  Subtrahend = 2054847098;
  Status     = SafeIntnSub (Minuend, Subtrahend, &Result);
  UT_ASSERT_EQUAL (RETURN_BUFFER_TOO_SMALL, Status);

  Minuend    = (2054847098);
  Subtrahend = (-2054847098);
  Status     = SafeIntnSub (Minuend, Subtrahend, &Result);
  UT_ASSERT_EQUAL (RETURN_BUFFER_TOO_SMALL, Status);

  return UNIT_TEST_PASSED;
}

UNIT_TEST_STATUS
EFIAPI
TestSafeUintnMult (
  IN UNIT_TEST_CONTEXT  Context
  )
{
  EFI_STATUS  Status;
  UINTN       Multiplicand;
  UINTN       Multiplier;
  UINTN       Result;

  //
  // If the result of multiplication doesn't overflow MAX_UINTN, it will succeed
  //
  Multiplicand = 0xa122a;
  Multiplier   = 0xd23;
  Result       = 0;
  Status       = SafeUintnMult (Multiplicand, Multiplier, &Result);
  UT_ASSERT_NOT_EFI_ERROR (Status);
  UT_ASSERT_EQUAL (0x844c9dbe, Result);

  //
  // Otherwise should result in an error status
  //
  Multiplicand = 0xa122a;
  Multiplier   = 0xed23;
  Status       = SafeUintnMult (Multiplicand, Multiplier, &Result);
  UT_ASSERT_EQUAL (RETURN_BUFFER_TOO_SMALL, Status);

  return UNIT_TEST_PASSED;
}

UNIT_TEST_STATUS
EFIAPI
TestSafeIntnMult (
  IN UNIT_TEST_CONTEXT  Context
  )
{
  EFI_STATUS  Status;
  INTN        Multiplicand;
  INTN        Multiplier;
  INTN        Result;

  //
  // If the result of multiplication doesn't overflow MAX_INTN and doesn't
  // underflow MIN_UINTN, it will succeed
  //
  Multiplicand = 0x123456;
  Multiplier   = 0x678;
  Result       = 0;
  Status       = SafeIntnMult (Multiplicand, Multiplier, &Result);
  UT_ASSERT_NOT_EFI_ERROR (Status);
  UT_ASSERT_EQUAL (0x75c28c50, Result);

  //
  // Otherwise should result in an error status
  //
  Multiplicand = 0x123456;
  Multiplier   = 0xabc;
  Status       = SafeIntnMult (Multiplicand, Multiplier, &Result);
  UT_ASSERT_EQUAL (RETURN_BUFFER_TOO_SMALL, Status);

  return UNIT_TEST_PASSED;
}
