/** @file
  Functions to deal with Disk buffer.

  Copyright (c) 2005 - 2018, 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 "HexEditor.h"
#include <Protocol/BlockIo.h>

extern EFI_HANDLE                 HImageHandleBackup;
extern HEFI_EDITOR_BUFFER_IMAGE   HBufferImage;

extern BOOLEAN                    HBufferImageNeedRefresh;
extern BOOLEAN                    HBufferImageOnlyLineNeedRefresh;
extern BOOLEAN                    HBufferImageMouseNeedRefresh;

extern HEFI_EDITOR_GLOBAL_EDITOR  HMainEditor;

HEFI_EDITOR_DISK_IMAGE            HDiskImage;
HEFI_EDITOR_DISK_IMAGE            HDiskImageBackupVar;

//
// for basic initialization of HDiskImage
//
HEFI_EDITOR_DISK_IMAGE            HDiskImageConst = {
  NULL,
  0,
  0,
  0
};

/**
  Initialization function for HDiskImage.
 
  @retval EFI_SUCCESS     The operation was successful.
  @retval EFI_LOAD_ERROR  A load error occured.
**/
EFI_STATUS
HDiskImageInit (
  VOID
  )
{
  //
  // basically initialize the HDiskImage
  //
  CopyMem (&HDiskImage, &HDiskImageConst, sizeof (HDiskImage));

  CopyMem (&HDiskImageBackupVar, &HDiskImageConst, sizeof (HDiskImageBackupVar));

  return EFI_SUCCESS;
}

/**
  Backup function for HDiskImage. Only a few fields need to be backup.   
  This is for making the Disk buffer refresh as few as possible.

  @retval EFI_SUCCESS           The operation was successful.
  @retval EFI_OUT_OF_RESOURCES  gST->ConOut of resources.
**/
EFI_STATUS
HDiskImageBackup (
  VOID
  )
{
  //
  // backup the disk name, offset and size
  //
  //
  SHELL_FREE_NON_NULL (HDiskImageBackupVar.Name);

  HDiskImageBackupVar.Name = CatSPrint(NULL, L"%s", HDiskImage.Name);
  if (HDiskImageBackupVar.Name == NULL) {
    return EFI_OUT_OF_RESOURCES;
  }

  HDiskImageBackupVar.Offset  = HDiskImage.Offset;
  HDiskImageBackupVar.Size    = HDiskImage.Size;

  return EFI_SUCCESS;
}

/**
  Cleanup function for HDiskImage.

  @retval EFI_SUCCESS           The operation was successful.
**/
EFI_STATUS
HDiskImageCleanup (
  VOID
  )
{
  SHELL_FREE_NON_NULL (HDiskImage.Name);
  SHELL_FREE_NON_NULL (HDiskImageBackupVar.Name);

  return EFI_SUCCESS;
}

/**
  Set FileName field in HFileImage.

  @param[in] Str      File name to set.
  @param[in] Offset   The offset.
  @param[in] Size     The size.

  @retval EFI_SUCCESS           The operation was successful.
  @retval EFI_OUT_OF_RESOURCES  A memory allocation failed.
**/
EFI_STATUS
HDiskImageSetDiskNameOffsetSize (
  IN CONST CHAR16   *Str,
  IN UINTN    Offset,
  IN UINTN    Size
  )
{
  if (Str == HDiskImage.Name) {
    //
    // This function might be called using HDiskImage.FileName as Str.
    // Directly return without updating HDiskImage.FileName.
    //
    return EFI_SUCCESS;
  }

  //
  // free the old file name
  //
  SHELL_FREE_NON_NULL (HDiskImage.Name);
  HDiskImage.Name = AllocateCopyPool (StrSize (Str), Str);
  if (HDiskImage.Name == NULL) {
    return EFI_OUT_OF_RESOURCES;
  }

  HDiskImage.Offset     = Offset;
  HDiskImage.Size       = Size;

  return EFI_SUCCESS;
}

/**
  Read a disk from disk into HBufferImage.

  @param[in] DeviceName   filename to read.
  @param[in] Offset       The offset.
  @param[in] Size         The size.
  @param[in] Recover      if is for recover, no information print.

  @retval EFI_SUCCESS           The operation was successful.
  @retval EFI_OUT_OF_RESOURCES  A memory allocation failed.
  @retval EFI_LOAD_ERROR        A load error occured.
  @retval EFI_INVALID_PARAMETER A parameter was invalid.  
**/
EFI_STATUS
HDiskImageRead (
  IN CONST CHAR16   *DeviceName,
  IN UINTN    Offset,
  IN UINTN    Size,
  IN BOOLEAN  Recover
  )
{
  CONST EFI_DEVICE_PATH_PROTOCOL  *DevicePath;
  EFI_DEVICE_PATH_PROTOCOL        *DupDevicePath;
  EFI_DEVICE_PATH_PROTOCOL        *DupDevicePathForFree;
  EFI_HANDLE                      Handle;
  EFI_BLOCK_IO_PROTOCOL           *BlkIo;
  EFI_STATUS                      Status;

  VOID                            *Buffer;
  CHAR16                          *Str;
  UINTN                           Bytes;

  HEFI_EDITOR_LINE                *Line;

  HBufferImage.BufferType = FileTypeDiskBuffer;

  DevicePath              = gEfiShellProtocol->GetDevicePathFromMap(DeviceName);
  if (DevicePath == NULL) {
    StatusBarSetStatusString (L"Cannot Find Device");
    return EFI_INVALID_PARAMETER;
  }
  DupDevicePath = DuplicateDevicePath(DevicePath);
  DupDevicePathForFree = DupDevicePath;
  //
  // get blkio interface
  //
  Status = gBS->LocateDevicePath(&gEfiBlockIoProtocolGuid,&DupDevicePath,&Handle);
  FreePool(DupDevicePathForFree);
  if (EFI_ERROR (Status)) {
    StatusBarSetStatusString (L"Read Disk Failed");
    return Status;
  }
  Status = gBS->OpenProtocol(Handle, &gEfiBlockIoProtocolGuid, (VOID**)&BlkIo, gImageHandle, NULL, EFI_OPEN_PROTOCOL_GET_PROTOCOL);
  if (EFI_ERROR (Status)) {
    StatusBarSetStatusString (L"Read Disk Failed");
    return Status;
  }
  //
  // if Offset exceeds LastBlock,
  //   return error
  //
  if (Offset > BlkIo->Media->LastBlock || Offset + Size > BlkIo->Media->LastBlock) {
    StatusBarSetStatusString (L"Invalid Offset + Size");
    return EFI_LOAD_ERROR;
  }

  Bytes   = BlkIo->Media->BlockSize * Size;
  Buffer  = AllocateZeroPool (Bytes);

  if (Buffer == NULL) {
    StatusBarSetStatusString (L"Read Disk Failed");
    return EFI_OUT_OF_RESOURCES;
  }

  //
  // read from disk
  //
  Status = BlkIo->ReadBlocks (
                    BlkIo,
                    BlkIo->Media->MediaId,
                    Offset,
                    Bytes,
                    Buffer
                    );

  if (EFI_ERROR (Status)) {
    FreePool (Buffer);
    StatusBarSetStatusString (L"Read Disk Failed");
    return EFI_LOAD_ERROR;
  }

  HBufferImageFree ();

  //
  // convert buffer to line list
  //
  Status = HBufferImageBufferToList (Buffer, Bytes);
  FreePool (Buffer);

  if (EFI_ERROR (Status)) {
    StatusBarSetStatusString (L"Read Disk Failed");
    return Status;
  }

  Status = HDiskImageSetDiskNameOffsetSize (DeviceName, Offset, Size);
  if (EFI_ERROR (Status)) {
    StatusBarSetStatusString (L"Read Disk Failed");
    return EFI_OUT_OF_RESOURCES;
  }
  //
  // initialize some variables
  //
  HDiskImage.BlockSize                = BlkIo->Media->BlockSize;

  HBufferImage.DisplayPosition.Row    = 2;
  HBufferImage.DisplayPosition.Column = 10;

  HBufferImage.MousePosition.Row      = 2;
  HBufferImage.MousePosition.Column   = 10;

  HBufferImage.LowVisibleRow          = 1;
  HBufferImage.HighBits               = TRUE;

  HBufferImage.BufferPosition.Row     = 1;
  HBufferImage.BufferPosition.Column  = 1;

  if (!Recover) {
    Str = CatSPrint(NULL, L"%d Lines Read", HBufferImage.NumLines);
    if (Str == NULL) {
      StatusBarSetStatusString (L"Read Disk Failed");
      return EFI_OUT_OF_RESOURCES;
    }

    StatusBarSetStatusString (Str);
    SHELL_FREE_NON_NULL (Str);

    HMainEditor.SelectStart = 0;
    HMainEditor.SelectEnd   = 0;

  }

  //
  // has line
  //
  if (HBufferImage.Lines != NULL) {
    HBufferImage.CurrentLine = CR (
                                HBufferImage.ListHead->ForwardLink,
                                HEFI_EDITOR_LINE,
                                Link,
                                EFI_EDITOR_LINE_LIST
                                );
  } else {
    //
    // create a dummy line
    //
    Line = HBufferImageCreateLine ();
    if (Line == NULL) {
      StatusBarSetStatusString (L"Read Disk Failed");
      return EFI_OUT_OF_RESOURCES;
    }

    HBufferImage.CurrentLine = Line;
  }

  HBufferImage.Modified           = FALSE;
  HBufferImageNeedRefresh         = TRUE;
  HBufferImageOnlyLineNeedRefresh = FALSE;
  HBufferImageMouseNeedRefresh    = TRUE;

  return EFI_SUCCESS;
}

/**
  Save lines in HBufferImage to disk.
  NOT ALLOW TO WRITE TO ANOTHER DISK!!!!!!!!!

  @param[in] DeviceName   The device name.
  @param[in] Offset       The offset.
  @param[in] Size         The size.

  @retval EFI_SUCCESS           The operation was successful.
  @retval EFI_OUT_OF_RESOURCES  A memory allocation failed.
  @retval EFI_LOAD_ERROR        A load error occured.
  @retval EFI_INVALID_PARAMETER A parameter was invalid.  
**/
EFI_STATUS
HDiskImageSave (
  IN CHAR16 *DeviceName,
  IN UINTN  Offset,
  IN UINTN  Size
  )
{

  CONST EFI_DEVICE_PATH_PROTOCOL  *DevicePath;
  EFI_DEVICE_PATH_PROTOCOL        *DupDevicePath;
  EFI_DEVICE_PATH_PROTOCOL        *DupDevicePathForFree;
  EFI_BLOCK_IO_PROTOCOL           *BlkIo;
  EFI_STATUS                      Status;
  EFI_HANDLE                      Handle;
  VOID                            *Buffer;
  UINTN                           Bytes;

  //
  // if not modified, directly return
  //
  if (HBufferImage.Modified == FALSE) {
    return EFI_SUCCESS;
  }

  HBufferImage.BufferType = FileTypeDiskBuffer;

  DevicePath              = gEfiShellProtocol->GetDevicePathFromMap(DeviceName);
  if (DevicePath == NULL) {
//    StatusBarSetStatusString (L"Cannot Find Device");
    return EFI_INVALID_PARAMETER;
  }
  DupDevicePath = DuplicateDevicePath(DevicePath);
  DupDevicePathForFree = DupDevicePath;

  //
  // get blkio interface
  //
  Status = gBS->LocateDevicePath(&gEfiBlockIoProtocolGuid,&DupDevicePath,&Handle);
  FreePool(DupDevicePathForFree);
  if (EFI_ERROR (Status)) {
//    StatusBarSetStatusString (L"Read Disk Failed");
    return Status;
  }
  Status = gBS->OpenProtocol(Handle, &gEfiBlockIoProtocolGuid, (VOID**)&BlkIo, gImageHandle, NULL, EFI_OPEN_PROTOCOL_GET_PROTOCOL);
  if (EFI_ERROR (Status)) {
//    StatusBarSetStatusString (L"Read Disk Failed");
    return Status;
  }

  Bytes   = BlkIo->Media->BlockSize * Size;
  Buffer  = AllocateZeroPool (Bytes);

  if (Buffer == NULL) {
    return EFI_OUT_OF_RESOURCES;
  }
  //
  // concatenate the line list to a buffer
  //
  Status = HBufferImageListToBuffer (Buffer, Bytes);
  if (EFI_ERROR (Status)) {
    FreePool (Buffer);
    return Status;
  }

  //
  // write the buffer to disk
  //
  Status = BlkIo->WriteBlocks (
                    BlkIo,
                    BlkIo->Media->MediaId,
                    Offset,
                    Bytes,
                    Buffer
                    );

  FreePool (Buffer);

  if (EFI_ERROR (Status)) {
    return EFI_LOAD_ERROR;
  }
  //
  // now not modified
  //
  HBufferImage.Modified = FALSE;

  return EFI_SUCCESS;
}
