src/system/boot/loader/file_systems/fat/fatfs.cpp

   1 /*
   2  * Copyright 2008, François Revol <revol@free.fr>
   3  * Distributed under the terms of the MIT License.
   4  */
   5
   6
   7 #include "fatfs.h"
   8
   9 #include <boot/partitions.h>
  10 #include <boot/platform.h>
  11
  12 #include <string.h>
  13 #include <unistd.h>
  14 #include <fcntl.h>
  15 #include <stdio.h>
  16 #include <stdlib.h>
  17
  18
  19 using namespace FATFS;
  20
  21 #if 0
  22 status_t
  23 FATFS::get_root_block(int fDevice, char *buffer, int32 blockSize, off_t partitionSize)
  24 {
  25         // calculate root block position (it depends on the block size)
  26
  27         // ToDo: get the number of reserved blocks out of the disk_environment structure??
  28         //              (from the amiga_rdb module)
  29         int32 reservedBlocks = 2;
  30         off_t offset = (((partitionSize / blockSize) - 1 - reservedBlocks) / 2) + reservedBlocks;
  31                 // ToDo: this calculation might be incorrect for certain cases.
  32
  33         if (read_pos(fDevice, offset * blockSize, buffer, blockSize) < B_OK)
  34                 return B_ERROR;
  35
  36         RootBlock root(buffer, blockSize);
  37         if (root.ValidateCheckSum() < B_OK)
  38                 return B_BAD_DATA;
  39
  40         //printf("primary = %ld, secondary = %ld\n", root.PrimaryType(), root.SecondaryType());
  41         if (!root.IsRootBlock())
  42                 return B_BAD_TYPE;
  43
  44         return B_OK;
  45 }
  46
  47 #endif
  48