mirror of
https://github.com/ekeeke/Genesis-Plus-GX.git
synced 2024-11-05 10:25:07 +01:00
100 lines
2.5 KiB
C
100 lines
2.5 KiB
C
|
/****************************************************************************
|
||
|
|
* FAT16 - VFAT Support
|
||
|
|
*
|
||
|
|
* NOTE: Only supports FAT16 with Long File Names
|
||
|
|
* I have no interest in adding FAT32
|
||
|
|
*
|
||
|
|
* Reference Documentation:
|
||
|
|
*
|
||
|
|
* FAT: General Overview of On-Disk Format
|
||
|
|
* Version 1.02 May 05, 1999
|
||
|
|
* Microsoft Corporation
|
||
|
|
*
|
||
|
|
* FAT: General Overview of On-Disk Format
|
||
|
|
* Version 1.03 December 06, 2000
|
||
|
|
* Microsoft Corporation
|
||
|
|
*
|
||
|
|
* This is targetted at MMC/SD cards.
|
||
|
|
*
|
||
|
|
* Copyright softdev 2007. All rights reserved.
|
||
|
|
*
|
||
|
|
* Diskio Module
|
||
|
|
* -------------
|
||
|
|
*
|
||
|
|
* This module is almost identical to the one found in ChaN's TinyFAT FS.
|
||
|
|
* It's a logical abstration after all :)
|
||
|
|
*
|
||
|
|
* This covers stdio file on a SD image file
|
||
|
|
****************************************************************************/
|
||
|
|
#include <gccore.h>
|
||
|
|
#include <stdio.h>
|
||
|
|
#include <stdlib.h>
|
||
|
|
#include <string.h>
|
||
|
|
#include <sdcard.h>
|
||
|
|
#include "vfat.h"
|
||
|
|
|
||
|
|
/* Not so public exports from card_io.c */
|
||
|
|
#define MAX_DRIVE 2
|
||
|
|
extern u8 g_CID[MAX_DRIVE][16];
|
||
|
|
extern u8 g_CSD[MAX_DRIVE][16];
|
||
|
|
extern u8 g_CardStatus[MAX_DRIVE][64];
|
||
|
|
extern s32 card_initIO(s32 drv_no);
|
||
|
|
extern s32 card_readSector(s32 drv_no,u32 sector_no,u8 *buf,u32 len);
|
||
|
|
extern s32 card_writeSector(s32 drv_no,u32 sector_no,const void *buf,u32 len);
|
||
|
|
extern s32 card_readStatus(s32 drv_no);
|
||
|
|
#define CARDIO_ERROR_READY 0
|
||
|
|
|
||
|
|
/* End of not so public exports */
|
||
|
|
|
||
|
|
/****************************************************************************
|
||
|
|
* DISKIO_Init
|
||
|
|
*
|
||
|
|
* Initialise communication with the disc
|
||
|
|
****************************************************************************/
|
||
|
|
int DISKIO_Init( int drive )
|
||
|
|
{
|
||
|
|
int res;
|
||
|
|
|
||
|
|
if ( drive < 0 || drive > 1 )
|
||
|
|
return FS_ERR_PARAM;
|
||
|
|
|
||
|
|
res = card_initIO( drive );
|
||
|
|
|
||
|
|
if ( res == CARDIO_ERROR_READY )
|
||
|
|
return FS_SUCCESS;
|
||
|
|
|
||
|
|
return FS_ERR_IO;
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
/****************************************************************************
|
||
|
|
* DISKIO_ReadSectors
|
||
|
|
*
|
||
|
|
* Read sectors from the disc
|
||
|
|
****************************************************************************/
|
||
|
|
int DISKIO_ReadSectors( int drive, void *buffer, int sector, int count )
|
||
|
|
{
|
||
|
|
int res = -1;
|
||
|
|
int i;
|
||
|
|
int bytes = 0;
|
||
|
|
|
||
|
|
if ( drive != 0 && drive != 1 )
|
||
|
|
return FS_ERR_PARAM; /* Must be 0 or 1 */
|
||
|
|
|
||
|
|
/* libOGC appears to only read in single sectors */
|
||
|
|
for( i = 0; i < count; i++ )
|
||
|
|
{
|
||
|
|
res = card_readSector( (int)drive, sector + i, buffer + bytes, SECTOR_SIZE);
|
||
|
|
if ( res != CARDIO_ERROR_READY )
|
||
|
|
return FS_ERR_IO;
|
||
|
|
bytes += SECTOR_SIZE;
|
||
|
|
}
|
||
|
|
|
||
|
|
if ( res == CARDIO_ERROR_READY )
|
||
|
|
return FS_SUCCESS;
|
||
|
|
|
||
|
|
return FS_ERR_IO;
|
||
|
|
|
||
|
|
}
|
||
|
|
|