/** @file
  Var Check Hii handler.

Copyright (c) 2015 - 2017, 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 "VarCheckHii.h"

GLOBAL_REMOVE_IF_UNREFERENCED CONST CHAR8 mVarCheckHiiHex[] = {'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F'};

/**
  Dump some hexadecimal data.

  @param[in] Indent     How many spaces to indent the output.
  @param[in] Offset     The offset of the dump.
  @param[in] DataSize   The size in bytes of UserData.
  @param[in] UserData   The data to dump.

**/
VOID
VarCheckHiiInternalDumpHex (
  IN UINTN        Indent,
  IN UINTN        Offset,
  IN UINTN        DataSize,
  IN VOID         *UserData
  )
{
  UINT8 *Data;

  CHAR8 Val[50];

  CHAR8 Str[20];

  UINT8 TempByte;
  UINTN Size;
  UINTN Index;

  Data = UserData;
  while (DataSize != 0) {
    Size = 16;
    if (Size > DataSize) {
      Size = DataSize;
    }

    for (Index = 0; Index < Size; Index += 1) {
      TempByte            = Data[Index];
      Val[Index * 3 + 0]  = mVarCheckHiiHex[TempByte >> 4];
      Val[Index * 3 + 1]  = mVarCheckHiiHex[TempByte & 0xF];
      Val[Index * 3 + 2]  = (CHAR8) ((Index == 7) ? '-' : ' ');
      Str[Index]          = (CHAR8) ((TempByte < ' ' || TempByte > 'z') ? '.' : TempByte);
    }

    Val[Index * 3]  = 0;
    Str[Index]      = 0;
    DEBUG ((EFI_D_INFO, "%*a%08X: %-48a *%a*\r\n", Indent, "", Offset, Val, Str));

    Data += Size;
    Offset += Size;
    DataSize -= Size;
  }
}

/**
  Var Check Hii Question.

  @param[in] HiiQuestion    Pointer to Hii Question
  @param[in] Data           Data pointer.
  @param[in] DataSize       Size of Data to set.

  @retval TRUE  Check pass
  @retval FALSE Check fail.

**/
BOOLEAN
VarCheckHiiQuestion (
  IN VAR_CHECK_HII_QUESTION_HEADER  *HiiQuestion,
  IN VOID                           *Data,
  IN UINTN                          DataSize
  )
{
  UINT64   OneData;
  UINT64   Minimum;
  UINT64   Maximum;
  UINT64   OneValue;
  UINT8    *Ptr;
  UINT8    Index;
  UINT8    MaxContainers;

  if (((UINT32) HiiQuestion->VarOffset + HiiQuestion->StorageWidth) > DataSize) {
    DEBUG ((EFI_D_INFO, "VarCheckHiiQuestion fail: (VarOffset(0x%04x) + StorageWidth(0x%02x)) > Size(0x%x)\n", HiiQuestion->VarOffset, HiiQuestion->StorageWidth, DataSize));
    return FALSE;
  }

  OneData = 0;
  CopyMem (&OneData, (UINT8 *) Data + HiiQuestion->VarOffset, HiiQuestion->StorageWidth);

  switch (HiiQuestion->OpCode) {
    case EFI_IFR_ONE_OF_OP:
      Ptr = (UINT8 *) ((VAR_CHECK_HII_QUESTION_ONEOF *) HiiQuestion + 1);
      while ((UINTN) Ptr < (UINTN) HiiQuestion + HiiQuestion->Length) {
        OneValue = 0;
        CopyMem (&OneValue, Ptr, HiiQuestion->StorageWidth);
        if (OneData == OneValue) {
          //
          // Match
          //
          break;
        }
        Ptr += HiiQuestion->StorageWidth;
      }
      if ((UINTN) Ptr >= ((UINTN) HiiQuestion + HiiQuestion->Length)) {
        //
        // No match
        //
        DEBUG ((EFI_D_INFO, "VarCheckHiiQuestion fail: OneOf mismatch (0x%lx)\n", OneData));
        DEBUG_CODE (VarCheckHiiInternalDumpHex (2, 0, HiiQuestion->Length, (UINT8 *) HiiQuestion););
        return FALSE;
      }
      break;

    case EFI_IFR_CHECKBOX_OP:
      if ((OneData != 0) && (OneData != 1)) {
        DEBUG ((EFI_D_INFO, "VarCheckHiiQuestion fail: CheckBox mismatch (0x%lx)\n", OneData));
        DEBUG_CODE (VarCheckHiiInternalDumpHex (2, 0, HiiQuestion->Length, (UINT8 *) HiiQuestion););
        return FALSE;
      }
      break;

    case EFI_IFR_NUMERIC_OP:
      Minimum = 0;
      Maximum = 0;
      Ptr = (UINT8 *) ((VAR_CHECK_HII_QUESTION_NUMERIC *) HiiQuestion + 1);
      CopyMem (&Minimum, Ptr, HiiQuestion->StorageWidth);
      Ptr += HiiQuestion->StorageWidth;
      CopyMem (&Maximum, Ptr, HiiQuestion->StorageWidth);
      Ptr += HiiQuestion->StorageWidth;

      //
      // No need to check Step, because it is ONLY for UI.
      //
      if ((OneData < Minimum) || (OneData > Maximum)) {
        DEBUG ((EFI_D_INFO, "VarCheckHiiQuestion fail: Numeric mismatch (0x%lx)\n", OneData));
        DEBUG_CODE (VarCheckHiiInternalDumpHex (2, 0, HiiQuestion->Length, (UINT8 *) HiiQuestion););
        return FALSE;
      }
      break;

    case EFI_IFR_ORDERED_LIST_OP:
      MaxContainers = ((VAR_CHECK_HII_QUESTION_ORDEREDLIST *) HiiQuestion)->MaxContainers;
      if (((UINT32) HiiQuestion->VarOffset + HiiQuestion->StorageWidth * MaxContainers) > DataSize) {
        DEBUG ((EFI_D_INFO, "VarCheckHiiQuestion fail: (VarOffset(0x%04x) + StorageWidth(0x%02x) * MaxContainers(0x%02x)) > Size(0x%x)\n", HiiQuestion->VarOffset, HiiQuestion->StorageWidth, MaxContainers, DataSize));
        return FALSE;
      }
      for (Index = 0; Index < MaxContainers; Index++) {
        OneData = 0;
        CopyMem (&OneData, (UINT8 *) Data + HiiQuestion->VarOffset + HiiQuestion->StorageWidth * Index, HiiQuestion->StorageWidth);
        if (OneData == 0) {
          //
          // The value of 0 is used to determine if a particular "slot" in the array is empty.
          //
          continue;
        }

        Ptr = (UINT8 *) ((VAR_CHECK_HII_QUESTION_ORDEREDLIST *) HiiQuestion + 1);
        while ((UINTN) Ptr < ((UINTN) HiiQuestion + HiiQuestion->Length)) {
          OneValue = 0;
          CopyMem (&OneValue, Ptr, HiiQuestion->StorageWidth);
          if (OneData == OneValue) {
            //
            // Match
            //
            break;
          }
          Ptr += HiiQuestion->StorageWidth;
        }
        if ((UINTN) Ptr >= ((UINTN) HiiQuestion + HiiQuestion->Length)) {
          //
          // No match
          //
          DEBUG ((EFI_D_INFO, "VarCheckHiiQuestion fail: OrderedList mismatch\n"));
          DEBUG_CODE (VarCheckHiiInternalDumpHex (2, 0, HiiQuestion->StorageWidth * MaxContainers, (UINT8 *) Data + HiiQuestion->VarOffset););
          DEBUG_CODE (VarCheckHiiInternalDumpHex (2, 0, HiiQuestion->Length, (UINT8 *) HiiQuestion););
          return FALSE;
        }
      }
      break;

    default:
      ASSERT (FALSE);
      break;
  }

  return TRUE;
}

VAR_CHECK_HII_VARIABLE_HEADER   *mVarCheckHiiBin = NULL;
UINTN                           mVarCheckHiiBinSize = 0;

/**
  SetVariable check handler HII.

  @param[in] VariableName       Name of Variable to set.
  @param[in] VendorGuid         Variable vendor GUID.
  @param[in] Attributes         Attribute value of the variable.
  @param[in] DataSize           Size of Data to set.
  @param[in] Data               Data pointer.

  @retval EFI_SUCCESS               The SetVariable check result was success.
  @retval EFI_SECURITY_VIOLATION    Check fail.

**/
EFI_STATUS
EFIAPI
SetVariableCheckHandlerHii (
  IN CHAR16     *VariableName,
  IN EFI_GUID   *VendorGuid,
  IN UINT32     Attributes,
  IN UINTN      DataSize,
  IN VOID       *Data
  )
{
  VAR_CHECK_HII_VARIABLE_HEADER     *HiiVariable;
  VAR_CHECK_HII_QUESTION_HEADER     *HiiQuestion;

  if (mVarCheckHiiBin == NULL) {
    return EFI_SUCCESS;
  }

  if ((((Attributes & EFI_VARIABLE_APPEND_WRITE) == 0) && (DataSize == 0)) || (Attributes == 0)) {
    //
    // Do not check delete variable.
    //
    return EFI_SUCCESS;
  }

  //
  // For Hii Variable header align.
  //
  HiiVariable = (VAR_CHECK_HII_VARIABLE_HEADER *) HEADER_ALIGN (mVarCheckHiiBin);
  while ((UINTN) HiiVariable < ((UINTN) mVarCheckHiiBin + mVarCheckHiiBinSize)) {
    if ((StrCmp ((CHAR16 *) (HiiVariable + 1), VariableName) == 0) &&
        (CompareGuid (&HiiVariable->Guid, VendorGuid))) {
      //
      // Found the Hii Variable that could be used to do check.
      //
      DEBUG ((EFI_D_INFO, "VarCheckHiiVariable - %s:%g with Attributes = 0x%08x Size = 0x%x\n", VariableName, VendorGuid, Attributes, DataSize));
      if (HiiVariable->Attributes != Attributes) {
        DEBUG ((EFI_D_INFO, "VarCheckHiiVariable fail for Attributes - 0x%08x\n", HiiVariable->Attributes));
        return EFI_SECURITY_VIOLATION;
      }

      if (DataSize == 0) {
        DEBUG ((EFI_D_INFO, "VarCheckHiiVariable - CHECK PASS with DataSize == 0 !\n"));
        return EFI_SUCCESS;
      }

      if (HiiVariable->Size != DataSize) {
        DEBUG ((EFI_D_INFO, "VarCheckHiiVariable fail for Size - 0x%x\n", HiiVariable->Size));
        return EFI_SECURITY_VIOLATION;
      }

      //
      // Do the check.
      // For Hii Question header align.
      //
      HiiQuestion = (VAR_CHECK_HII_QUESTION_HEADER *) HEADER_ALIGN (((UINTN) HiiVariable + HiiVariable->HeaderLength));
      while ((UINTN) HiiQuestion < ((UINTN) HiiVariable + HiiVariable->Length)) {
        if (!VarCheckHiiQuestion (HiiQuestion, Data, DataSize)) {
          return EFI_SECURITY_VIOLATION;
        }
        //
        // For Hii Question header align.
        //
        HiiQuestion = (VAR_CHECK_HII_QUESTION_HEADER *) HEADER_ALIGN (((UINTN) HiiQuestion + HiiQuestion->Length));
      }

      DEBUG ((EFI_D_INFO, "VarCheckHiiVariable - ALL CHECK PASS!\n"));
      return EFI_SUCCESS;
    }
    //
    // For Hii Variable header align.
    //
    HiiVariable = (VAR_CHECK_HII_VARIABLE_HEADER *) HEADER_ALIGN (((UINTN) HiiVariable + HiiVariable->Length));
  }

  // Not found, so pass.
  return EFI_SUCCESS;
}

#ifdef DUMP_VAR_CHECK_HII
GLOBAL_REMOVE_IF_UNREFERENCED VAR_CHECK_HII_OPCODE_STRING   mHiiOpCodeStringTable[] = {
  {EFI_IFR_VARSTORE_EFI_OP,     "EfiVarStore"},
  {EFI_IFR_ONE_OF_OP,           "OneOf"},
  {EFI_IFR_CHECKBOX_OP,         "CheckBox"},
  {EFI_IFR_NUMERIC_OP,          "Numeric"},
  {EFI_IFR_ORDERED_LIST_OP,     "OrderedList"},
};

/**
  HII opcode to string.

  @param[in] HiiOpCode  Hii OpCode.

  @return Pointer to string.

**/
CHAR8 *
HiiOpCodeToStr (
  IN UINT8  HiiOpCode
  )
{
  UINTN     Index;
  for (Index = 0; Index < ARRAY_SIZE (mHiiOpCodeStringTable); Index++) {
    if (mHiiOpCodeStringTable[Index].HiiOpCode == HiiOpCode) {
      return mHiiOpCodeStringTable[Index].HiiOpCodeStr;
    }
  }

  return "<UnknownHiiOpCode>";
}

/**
  Dump Hii Question.

  @param[in] HiiQuestion    Pointer to Hii Question.

**/
VOID
DumpHiiQuestion (
  IN VAR_CHECK_HII_QUESTION_HEADER  *HiiQuestion
  )
{
  UINT64    Minimum;
  UINT64    Maximum;
  UINT64    OneValue;
  UINT8     *Ptr;

  DEBUG ((EFI_D_INFO, "  VAR_CHECK_HII_QUESTION_HEADER\n"));
  DEBUG ((EFI_D_INFO, "    OpCode        - 0x%02x (%a)\n", HiiQuestion->OpCode, HiiOpCodeToStr (HiiQuestion->OpCode)));
  DEBUG ((EFI_D_INFO, "    Length        - 0x%02x\n", HiiQuestion->Length));
  DEBUG ((EFI_D_INFO, "    VarOffset     - 0x%04x\n", HiiQuestion->VarOffset));
  DEBUG ((EFI_D_INFO, "    StorageWidth  - 0x%02x\n", HiiQuestion->StorageWidth));

  switch (HiiQuestion->OpCode) {
    case EFI_IFR_ONE_OF_OP:
      Ptr = (UINT8 *) ((VAR_CHECK_HII_QUESTION_ONEOF *) HiiQuestion + 1);
      while ((UINTN) Ptr < ((UINTN) HiiQuestion + HiiQuestion->Length)) {
        OneValue = 0;
        CopyMem (&OneValue, Ptr, HiiQuestion->StorageWidth);
        switch (HiiQuestion->StorageWidth) {
          case sizeof (UINT8):
            DEBUG ((EFI_D_INFO, "    OneOfOption   - 0x%02x\n", OneValue));
            break;
          case sizeof (UINT16):
            DEBUG ((EFI_D_INFO, "    OneOfOption   - 0x%04x\n", OneValue));
            break;
          case sizeof (UINT32):
            DEBUG ((EFI_D_INFO, "    OneOfOption   - 0x%08x\n", OneValue));
            break;
          case sizeof (UINT64):
            DEBUG ((EFI_D_INFO, "    OneOfOption   - 0x%016lx\n", OneValue));
            break;
          default:
            ASSERT (FALSE);
            break;
        }
        Ptr += HiiQuestion->StorageWidth;
      }
      break;

    case EFI_IFR_CHECKBOX_OP:
      break;

    case EFI_IFR_NUMERIC_OP:
      Minimum = 0;
      Maximum = 0;
      Ptr = (UINT8 *) ((VAR_CHECK_HII_QUESTION_NUMERIC *) HiiQuestion + 1);
      CopyMem (&Minimum, Ptr, HiiQuestion->StorageWidth);
      Ptr += HiiQuestion->StorageWidth;
      CopyMem (&Maximum, Ptr, HiiQuestion->StorageWidth);
      Ptr += HiiQuestion->StorageWidth;

      switch (HiiQuestion->StorageWidth) {
        case sizeof (UINT8):
          DEBUG ((EFI_D_INFO, "    Minimum       - 0x%02x\n", Minimum));
          DEBUG ((EFI_D_INFO, "    Maximum       - 0x%02x\n", Maximum));
          break;
        case sizeof (UINT16):
          DEBUG ((EFI_D_INFO, "    Minimum       - 0x%04x\n", Minimum));
          DEBUG ((EFI_D_INFO, "    Maximum       - 0x%04x\n", Maximum));
          break;
        case sizeof (UINT32):
          DEBUG ((EFI_D_INFO, "    Minimum       - 0x%08x\n", Minimum));
          DEBUG ((EFI_D_INFO, "    Maximum       - 0x%08x\n", Maximum));
          break;
        case sizeof (UINT64):
          DEBUG ((EFI_D_INFO, "    Minimum       - 0x%016lx\n", Minimum));
          DEBUG ((EFI_D_INFO, "    Maximum       - 0x%016lx\n", Maximum));
          break;
        default:
          ASSERT (FALSE);
          break;
      }
      break;

    case EFI_IFR_ORDERED_LIST_OP:
      DEBUG ((EFI_D_INFO, "    MaxContainers - 0x%02x\n", ((VAR_CHECK_HII_QUESTION_ORDEREDLIST *) HiiQuestion)->MaxContainers));
      Ptr = (UINT8 *) ((VAR_CHECK_HII_QUESTION_ORDEREDLIST *) HiiQuestion + 1);
      while ((UINTN) Ptr < ((UINTN) HiiQuestion + HiiQuestion->Length)) {
        OneValue = 0;
        CopyMem (&OneValue, Ptr, HiiQuestion->StorageWidth);
        switch (HiiQuestion->StorageWidth) {
          case sizeof (UINT8):
            DEBUG ((EFI_D_INFO, "    OneOfOption   - 0x%02x\n", OneValue));
            break;
          case sizeof (UINT16):
            DEBUG ((EFI_D_INFO, "    OneOfOption   - 0x%04x\n", OneValue));
            break;
          case sizeof (UINT32):
            DEBUG ((EFI_D_INFO, "    OneOfOption   - 0x%08x\n", OneValue));
            break;
          case sizeof (UINT64):
            DEBUG ((EFI_D_INFO, "    OneOfOption   - 0x%016lx\n", OneValue));
            break;
          default:
            ASSERT (FALSE);
            break;
        }
        Ptr += HiiQuestion->StorageWidth;
      }
      break;

    default:
      ASSERT (FALSE);
      break;
  }
}

/**
  Dump Hii Variable.

  @param[in] HiiVariable    Pointer to Hii Variable.

**/
VOID
DumpHiiVariable (
  IN VAR_CHECK_HII_VARIABLE_HEADER  *HiiVariable
  )
{
  VAR_CHECK_HII_QUESTION_HEADER *HiiQuestion;

  DEBUG ((EFI_D_INFO, "VAR_CHECK_HII_VARIABLE_HEADER\n"));
  DEBUG ((EFI_D_INFO, "  Revision        - 0x%04x\n", HiiVariable->Revision));
  DEBUG ((EFI_D_INFO, "  HeaderLength    - 0x%04x\n", HiiVariable->HeaderLength));
  DEBUG ((EFI_D_INFO, "  Length          - 0x%08x\n", HiiVariable->Length));
  DEBUG ((EFI_D_INFO, "  OpCode          - 0x%02x (%a)\n", HiiVariable->OpCode, HiiOpCodeToStr (HiiVariable->OpCode)));
  DEBUG ((EFI_D_INFO, "  Size            - 0x%04x\n", HiiVariable->Size));
  DEBUG ((EFI_D_INFO, "  Attributes      - 0x%08x\n", HiiVariable->Attributes));
  DEBUG ((EFI_D_INFO, "  Guid            - %g\n", &HiiVariable->Guid));
  DEBUG ((EFI_D_INFO, "  Name            - %s\n", HiiVariable + 1));

  //
  // For Hii Question header align.
  //
  HiiQuestion = (VAR_CHECK_HII_QUESTION_HEADER *) HEADER_ALIGN (((UINTN) HiiVariable + HiiVariable->HeaderLength));
  while ((UINTN) HiiQuestion < ((UINTN) HiiVariable + HiiVariable->Length)) {
    //
    // Dump Hii Question related to the Hii Variable.
    //
    DumpHiiQuestion (HiiQuestion);
    //
    // For Hii Question header align.
    //
    HiiQuestion = (VAR_CHECK_HII_QUESTION_HEADER *) HEADER_ALIGN (((UINTN) HiiQuestion + HiiQuestion->Length));
  }
}

/**
  Dump Var Check HII.

  @param[in] VarCheckHiiBin     Pointer to VarCheckHiiBin.
  @param[in] VarCheckHiiBinSize VarCheckHiiBin size.

**/
VOID
DumpVarCheckHii (
  IN VOID   *VarCheckHiiBin,
  IN UINTN  VarCheckHiiBinSize
  )
{
  VAR_CHECK_HII_VARIABLE_HEADER     *HiiVariable;

  DEBUG ((EFI_D_INFO, "DumpVarCheckHii\n"));

  //
  // For Hii Variable header align.
  //
  HiiVariable = (VAR_CHECK_HII_VARIABLE_HEADER *) HEADER_ALIGN (VarCheckHiiBin);
  while ((UINTN) HiiVariable < ((UINTN) VarCheckHiiBin + VarCheckHiiBinSize)) {
    DumpHiiVariable (HiiVariable);
    //
    // For Hii Variable header align.
    //
    HiiVariable = (VAR_CHECK_HII_VARIABLE_HEADER *) HEADER_ALIGN (((UINTN) HiiVariable + HiiVariable->Length));
  }
}
#endif

/**
  Constructor function of VarCheckHiiLib to register var check HII handler.

  @param[in] ImageHandle    The firmware allocated handle for the EFI image.
  @param[in] SystemTable    A pointer to the EFI System Table.

  @retval EFI_SUCCESS       The constructor executed correctly.

**/
EFI_STATUS
EFIAPI
VarCheckHiiLibNullClassConstructor (
  IN EFI_HANDLE             ImageHandle,
  IN EFI_SYSTEM_TABLE       *SystemTable
  )
{
  VarCheckLibRegisterEndOfDxeCallback (VarCheckHiiGen);
  VarCheckLibRegisterAddressPointer ((VOID **) &mVarCheckHiiBin);
  VarCheckLibRegisterSetVariableCheckHandler (SetVariableCheckHandlerHii);

  return EFI_SUCCESS;
}