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73 lines
2.9 KiB
C
73 lines
2.9 KiB
C
/*
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file_allocation_table.h
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Reading, writing and manipulation of the FAT structure on
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a FAT partition
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Copyright (c) 2006 Michael "Chishm" Chisholm
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Redistribution and use in source and binary forms, with or without modification,
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are permitted provided that the following conditions are met:
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1. Redistributions of source code must retain the above copyright notice,
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this list of conditions and the following disclaimer.
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2. Redistributions in binary form must reproduce the above copyright notice,
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this list of conditions and the following disclaimer in the documentation and/or
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other materials provided with the distribution.
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3. The name of the author may not be used to endorse or promote products derived
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from this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
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AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE
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LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
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EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef __FAT_H
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#define __FAT_H
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#include "common.h"
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#include "partition.h"
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#define CLUSTER_EOF_16 0xFFFF
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#define CLUSTER_EOF 0x0FFFFFFF
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#define CLUSTER_FREE 0x00000000
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#define CLUSTER_ROOT 0x00000000
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#define CLUSTER_FIRST 0x00000002
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#define CLUSTER_ERROR 0xFFFFFFFF
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#define CLUSTERS_PER_FAT12 4085
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#define CLUSTERS_PER_FAT16 65525
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uint32_t _FAT_fat_nextCluster( PARTITION* partition, uint32_t cluster );
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uint32_t _FAT_fat_linkFreeCluster( PARTITION* partition, uint32_t cluster );
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uint32_t _FAT_fat_linkFreeClusterCleared ( PARTITION* partition, uint32_t cluster );
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bool _FAT_fat_clearLinks ( PARTITION* partition, uint32_t cluster );
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uint32_t _FAT_fat_trimChain ( PARTITION* partition, uint32_t startCluster, unsigned int chainLength );
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uint32_t _FAT_fat_lastCluster ( PARTITION* partition, uint32_t cluster );
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unsigned int _FAT_fat_freeClusterCount ( PARTITION* partition );
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static inline sec_t _FAT_fat_clusterToSector ( PARTITION* partition, uint32_t cluster )
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{
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return ( cluster >= CLUSTER_FIRST ) ?
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( ( cluster - CLUSTER_FIRST ) * ( sec_t )partition->sectorsPerCluster ) + partition->dataStart :
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partition->rootDirStart;
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}
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static inline bool _FAT_fat_isValidCluster ( PARTITION* partition, uint32_t cluster )
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{
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return ( cluster >= CLUSTER_FIRST ) && ( cluster <= partition->fat.lastCluster /* This will catch CLUSTER_ERROR */ );
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}
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#endif // _FAT_H
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