diff options
Diffstat (limited to 'sdk-modifications/libsrc/fs/file_allocation_table.h')
| -rw-r--r-- | sdk-modifications/libsrc/fs/file_allocation_table.h | 64 |
1 files changed, 64 insertions, 0 deletions
diff --git a/sdk-modifications/libsrc/fs/file_allocation_table.h b/sdk-modifications/libsrc/fs/file_allocation_table.h new file mode 100644 index 0000000..4fb4149 --- /dev/null +++ b/sdk-modifications/libsrc/fs/file_allocation_table.h @@ -0,0 +1,64 @@ +/* + 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. + + 2006-07-11 - Chishm + * Original release + + 2006-10-01 - Chishm + * Added _FAT_fat_linkFreeClusterCleared to clear a cluster when it is allocated +*/ + +#ifndef _FAT_H +#define _FAT_H + +#include "fs_common.h" +#include "partition.h" + +#define CLUSTER_EOF_16 0xFFFF +#define CLUSTER_EOF 0x0FFFFFFF +#define CLUSTER_FREE 0x0000 +#define CLUSTER_FIRST 0x0002 + +#define CLUSTERS_PER_FAT12 4085 +#define CLUSTERS_PER_FAT16 65525 + + +u32 _FAT_fat_nextCluster(PARTITION* partition, u32 cluster); + +u32 _FAT_fat_linkFreeCluster(PARTITION* partition, u32 cluster); +u32 _FAT_fat_linkFreeClusterCleared (PARTITION* partition, u32 cluster); + +bool _FAT_fat_clearLinks (PARTITION* partition, u32 cluster); + +u32 _FAT_fat_lastCluster (PARTITION* partition, u32 cluster); + +static inline u32 _FAT_fat_clusterToSector (PARTITION* partition, u32 cluster) { + return (cluster >= 2) ? ((cluster - 2) * partition->sectorsPerCluster) + partition->dataStart : partition->rootDirStart; +} + +#endif // _FAT_H |