mirror of
https://github.com/wiidev/usbloadergx.git
synced 2024-12-23 10:21:55 +01:00
73 lines
2.9 KiB
C
73 lines
2.9 KiB
C
/*
|
|
file_allocation_table.h
|
|
Reading, writing and manipulation of the FAT structure on
|
|
a FAT partition
|
|
|
|
Copyright (c) 2006 Michael "Chishm" Chisholm
|
|
|
|
Redistribution and use in source and binary forms, with or without modification,
|
|
are permitted provided that the following conditions are met:
|
|
|
|
1. Redistributions 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. The name of the author may not be used to endorse or promote products derived
|
|
from this software without specific prior written permission.
|
|
|
|
THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
|
|
WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
|
|
AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR 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.
|
|
*/
|
|
|
|
#ifndef __FAT_H
|
|
#define __FAT_H
|
|
|
|
#include "common.h"
|
|
#include "partition.h"
|
|
|
|
#define CLUSTER_EOF_16 0xFFFF
|
|
#define CLUSTER_EOF 0x0FFFFFFF
|
|
#define CLUSTER_FREE 0x00000000
|
|
#define CLUSTER_ROOT 0x00000000
|
|
#define CLUSTER_FIRST 0x00000002
|
|
#define CLUSTER_ERROR 0xFFFFFFFF
|
|
|
|
#define CLUSTERS_PER_FAT12 4085
|
|
#define CLUSTERS_PER_FAT16 65525
|
|
|
|
|
|
uint32_t _FAT_fat_nextCluster( PARTITION* partition, uint32_t cluster );
|
|
|
|
uint32_t _FAT_fat_linkFreeCluster( PARTITION* partition, uint32_t cluster );
|
|
uint32_t _FAT_fat_linkFreeClusterCleared ( PARTITION* partition, uint32_t cluster );
|
|
|
|
bool _FAT_fat_clearLinks ( PARTITION* partition, uint32_t cluster );
|
|
|
|
uint32_t _FAT_fat_trimChain ( PARTITION* partition, uint32_t startCluster, unsigned int chainLength );
|
|
|
|
uint32_t _FAT_fat_lastCluster ( PARTITION* partition, uint32_t cluster );
|
|
|
|
unsigned int _FAT_fat_freeClusterCount ( PARTITION* partition );
|
|
|
|
static inline sec_t _FAT_fat_clusterToSector ( PARTITION* partition, uint32_t cluster )
|
|
{
|
|
return ( cluster >= CLUSTER_FIRST ) ?
|
|
( ( cluster - CLUSTER_FIRST ) * ( sec_t )partition->sectorsPerCluster ) + partition->dataStart :
|
|
partition->rootDirStart;
|
|
}
|
|
|
|
static inline bool _FAT_fat_isValidCluster ( PARTITION* partition, uint32_t cluster )
|
|
{
|
|
return ( cluster >= CLUSTER_FIRST ) && ( cluster <= partition->fat.lastCluster /* This will catch CLUSTER_ERROR */ );
|
|
}
|
|
|
|
#endif // _FAT_H
|