reactos/boot/environ/lib/misc/bcd.c

   1 /*
   2  * COPYRIGHT:       See COPYING.ARM in the top level directory
   3  * PROJECT:         ReactOS UEFI Boot Library
   4  * FILE:            boot/environ/lib/misc/bcd.c
   5  * PURPOSE:         Boot Library BCD Routines
   6  * PROGRAMMER:      Alex Ionescu (alex.ionescu@reactos.org)
   7  */
   8
   9 /* INCLUDES ******************************************************************/
  10
  11 #include "bl.h"
  12
  13 /* FUNCTIONS *****************************************************************/
  14
  15 /*++
  16  * @name BlGetBootOptionListSize
  17  *
  18  *     The BlGetBootOptionListSize routine
  19  *
  20  * @param  BcdOption
  21  *         UEFI Image Handle for the current loaded application.
  22  *
  23  * @return Size of the BCD option
  24  *
  25  *--*/
  26 ULONG
  27 BlGetBootOptionListSize (
  28     _In_ PBL_BCD_OPTION BcdOption
  29     )
  30 {
  31     ULONG Size = 0, NextOffset = 0;
  32     PBL_BCD_OPTION NextOption;
  33
  34     /* Loop all the options*/
  35     do
  36     {
  37         /* Move to the next one */
  38         NextOption = (PBL_BCD_OPTION)((ULONG_PTR)BcdOption + NextOffset);
  39
  40         /* Compute the size of the next one */
  41         Size += BlGetBootOptionSize(NextOption);
  42
  43         /* Update the offset */
  44         NextOffset = NextOption->NextEntryOffset;
  45     } while (NextOffset != 0);
  46
  47     /* Return final computed size */
  48     return Size;
  49 }
  50
  51 /*++
  52  * @name BlGetBootOptionSize
  53  *
  54  *     The BlGetBootOptionSize routine
  55  *
  56  * @param  BcdOption
  57  *         UEFI Image Handle for the current loaded application.
  58  *
  59  * @return Size of the BCD option
  60  *
  61  *--*/
  62 ULONG
  63 BlGetBootOptionSize (
  64     _In_ PBL_BCD_OPTION BcdOption
  65     )
  66 {
  67     ULONG Size, Offset;
  68
  69     /* Check if there's any data */
  70     if (BcdOption->DataOffset != 0)
  71     {
  72         /* Add the size of the data */
  73         Size = BcdOption->DataOffset + BcdOption->DataSize;
  74     }
  75     else
  76     {
  77         /* No data, just the structure itself */
  78         Size = sizeof(*BcdOption);
  79     }
  80
  81     /* Any associated options? */
  82     Offset = BcdOption->ListOffset;
  83     if (Offset != 0)
  84     {
  85         /* Go get those too */
  86         Size += BlGetBootOptionListSize((PVOID)((ULONG_PTR)BcdOption + Offset));
  87     }
  88
  89     /* Return the final size */
  90     return Size;
  91 }