/**
  ******************************************************************************
  * @file    Demonstrations/Src/fatfs_storage.c
  * @author  MCD Application Team
  * @brief   This file includes the Storage (FatFs) driver 
  ******************************************************************************
  * @attention
  *
  * <h2><center>&copy; Copyright (c) 2016 STMicroelectronics International N.V. 
  * All rights reserved.</center></h2>
  *
  * Redistribution and use in source and binary forms, with or without 
  * modification, are permitted, provided that the following conditions are met:
  *
  * 1. Redistribution of source code must retain the above copyright notice, 
  *    this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright notice,
  *    this list of conditions and the following disclaimer in the documentation
  *    and/or other materials provided with the distribution.
  * 3. Neither the name of STMicroelectronics nor the names of other 
  *    contributors to this software may be used to endorse or promote products 
  *    derived from this software without specific written permission.
  * 4. This software, including modifications and/or derivative works of this 
  *    software, must execute solely and exclusively on microcontroller or
  *    microprocessor devices manufactured by or for STMicroelectronics.
  * 5. Redistribution and use of this software other than as permitted under 
  *    this license is void and will automatically terminate your rights under 
  *    this license. 
  *
  * THIS SOFTWARE IS PROVIDED BY STMICROELECTRONICS AND CONTRIBUTORS "AS IS" 
  * AND ANY EXPRESS, IMPLIED OR STATUTORY WARRANTIES, INCLUDING, BUT NOT 
  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A 
  * PARTICULAR PURPOSE AND NON-INFRINGEMENT OF THIRD PARTY INTELLECTUAL PROPERTY
  * RIGHTS ARE DISCLAIMED TO THE FULLEST EXTENT PERMITTED BY LAW. IN NO EVENT 
  * SHALL STMICROELECTRONICS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, 
  * OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF 
  * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING 
  * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
  * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  *
  ******************************************************************************
  */

/* Includes ------------------------------------------------------------------*/
#include "main.h"
#include <string.h>

/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
#define BITMAP_BUFFER_SIZE 1*512 /* You can adapt this size depending on the amount of RAM available */
#define BITMAP_HEADER_SIZE sizeof(BmpHeader) /* Bitmap specificity */
#define MIN(a,b) (((a)<(b))?(a):(b))
/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
uint8_t aBuffer[BITMAP_HEADER_SIZE + BITMAP_BUFFER_SIZE];
FILINFO MyFileInfo;
DIR MyDirectory;
FIL MyFile;
UINT BytesWritten, BytesRead;

/* Private function prototypes -----------------------------------------------*/
/* Private functions ---------------------------------------------------------*/

/**
  * @brief  Open a file and display it on lcd
  * @param  DirName: the Directory name to open
  * @param  FileName: the file name to open
  * @param  BufferAddress: A pointer to a buffer to copy the file to
  * @param  FileLen: the File length
  * @retval err: Error status (0=> success, 1=> fail)
  */
uint32_t Storage_OpenReadFile(uint8_t Xpoz, uint16_t Ypoz, const char *BmpName)
{
  uint32_t size = 0;
  FIL bmpfile;
  uint32_t nbline;
  BmpHeader* pbmpheader = (BmpHeader*)aBuffer;
  
  /* Close a bmp file */
  f_open(&bmpfile, BmpName, FA_READ);
  
  /* Read the constant part of the header from the file and store it at the top of aBuffer*/
  f_read(&bmpfile, &aBuffer, BITMAP_HEADER_SIZE, &BytesRead);
  
  /* Get the size of the data stored inside the file */
  size = pbmpheader->fsize - pbmpheader->offset;
  
  /* Start reading at the top of the file */
  f_lseek(&bmpfile, 0);
  
  /* Read the entire header from the file and store it at the top of aBuffer */
  f_read(&bmpfile, &aBuffer, pbmpheader->offset, &BytesRead);
  
  /* Compute the number of entire lines which can be stored inside the buffer */
  nbline = (BITMAP_BUFFER_SIZE - pbmpheader->offset + BITMAP_HEADER_SIZE)/(pbmpheader->w * 2);
  
  /* As long as the entire bitmap file as not been displayed */
  do
  {
    uint32_t nbbytetoread;
    
    /* Get the number of bytes which can be stored inside the buffer */
    nbbytetoread = MIN(size,nbline*pbmpheader->w*2);
  
    /* Adapt the total size of the bitmap, stored inside the header, to this chunck */
    pbmpheader->fsize = pbmpheader->offset + nbbytetoread;
  
    /* Adapt the number of line, stored inside the header, to this chunck */
    pbmpheader->h = nbbytetoread/(pbmpheader->w*2);
    
    /* Start reading at the end of the file */
    f_lseek(&bmpfile, pbmpheader->offset + size - nbbytetoread);
    
    /* Store this chunck (or the entire part if possible) of the file inside a buffer */
    f_read(&bmpfile, aBuffer + pbmpheader->offset, nbbytetoread, &BytesRead);
  
    /* Draw the bitmap */
    BSP_LCD_DrawBitmap(Xpoz, Ypoz, aBuffer);    
      
    /* Update the remaining number of bytes to read */
    size -= nbbytetoread;
    
    /* Change the display position of the next bitmap */
    Ypoz += nbline;
      
  }while (size > 0);
  
  /* Close the bmp file */
  f_close(&bmpfile);
  
  return 0;
}      

/**
  * @brief  Copy file BmpName1 to BmpName2 
  * @param  BmpName1: the source file name
  * @param  BmpName2: the destination file name
  * @retval err: Error status (0=> success, 1=> fail)
  */
uint32_t Storage_CopyFile(const char* BmpName1, const char* BmpName2)
{
  uint32_t index = 0;
  FIL file1, file2;
  
  /* Open an Existent BMP file system */
  f_open(&file1, BmpName1, FA_READ);
  /* Create a new BMP file system */
  f_open(&file2, BmpName2, FA_CREATE_ALWAYS | FA_WRITE);
  
  do 
  {
    f_read(&file1, aBuffer, _MAX_SS, &BytesRead);
    f_write(&file2, aBuffer, _MAX_SS, &BytesWritten);  
    index+= _MAX_SS;
    
  } while(index < f_size(&file1));
  
  f_close(&file1);
  f_close(&file2);
  
  return 1;
}

/**
  * @brief  Opens a file and copies its content to a buffer.
  * @param  DirName: the Directory name to open
  * @param  FileName: the file name to open
  * @param  BufferAddress: A pointer to a buffer to copy the file to
  * @param  FileLen: File length
  * @retval err: Error status (0=> success, 1=> fail)
  */
uint32_t Storage_CheckBitmapFile(const char* BmpName, uint32_t *FileLen)
{
  uint32_t err = 0;
 
  if(f_open(&MyFile, BmpName, FA_READ) != FR_OK)
  {
    err = 1;
  }
  else
  {
    if(f_close(&MyFile) != FR_OK)
    {
      err = 1;
    }
  }
    
  return err;
}

/**
  * @brief  List up to 25 file on the root directory with extension .BMP
  * @param  DirName: Directory name
  * @param  Files: Buffer to contain read files
  * @retval The number of the found files
  */
uint32_t Storage_GetDirectoryBitmapFiles(const char* DirName, char* Files[])
{
  FRESULT res;
  uint32_t index = 0;

  /* Start to search for BMP files */
  res = f_findfirst(&MyDirectory, &MyFileInfo, DirName, "*.bmp");

  /* Repeat while an item is found */
  while (MyFileInfo.fname[0])
  {
    if(res == FR_OK)
    {
      if(index < MAX_BMP_FILES)
      {
        sprintf (Files[index++], "%s", MyFileInfo.fname);
      }
      /* Search for next item */
      res = f_findnext(&MyDirectory, &MyFileInfo);
    }
    else
    {
      index = 0;
      break;
    }
  }

  f_closedir(&MyDirectory);

  return index;
}

/**
  * @brief  Compares two buffers.
  * @param  pBuffer1, pBuffer2: buffers to be compared
  * @param  BufferLength: buffer's length
  * @retval  0: pBuffer1 identical to pBuffer2
  *          1: pBuffer1 differs from pBuffer2
  */
uint8_t Buffercmp(uint8_t* pBuffer1, uint8_t* pBuffer2, uint16_t BufferLength)
{
  uint8_t ret = 1;
  
  while (BufferLength--)
  {
    if(*pBuffer1 != *pBuffer2)
    {
      ret = 0;
    }
    
    pBuffer1++;
    pBuffer2++;
  }
  
  return ret;
}

/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/