mirror of
https://github.com/wiidev/usbloadergx.git
synced 2024-11-12 22:45:08 +01:00
71 lines
2.8 KiB
C
71 lines
2.8 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
|