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Added _FAT_fat_linkFreeClusterCleared to clear a cluster when it is allocated

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This commit is contained in:
Michael Chisholm 2006-09-30 15:58:33 +00:00
parent 31a9ccffec
commit dbdb8900b5
2 changed files with 38 additions and 0 deletions
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34
source/file_allocation_table.c
View File

@ -31,11 +31,15 @@
2006-07-11 - Chishm 2006-07-11 - Chishm
* Made several fixes related to free clusters, thanks to Loopy * Made several fixes related to free clusters, thanks to Loopy
2006-10-01 - Chishm
* Added _FAT_fat_linkFreeClusterCleared to clear a cluster when it is allocated
*/ */
#include "file_allocation_table.h" #include "file_allocation_table.h"
#include "partition.h" #include "partition.h"
#include <string.h>
/* /*
Gets the cluster linked from input cluster Gets the cluster linked from input cluster
@ -256,6 +260,36 @@ u32 _FAT_fat_linkFreeCluster(PARTITION* partition, u32 cluster) {
return firstFree; return firstFree;
} }
/*-----------------------------------------------------------------
gets the first available free cluster, sets it
to end of file, links the input cluster to it, clears the new
cluster to 0 valued bytes, then returns the cluster number
If an error occurs, return CLUSTER_FREE
-----------------------------------------------------------------*/
u32 _FAT_fat_linkFreeClusterCleared (PARTITION* partition, u32 cluster) {
u32 newCluster;
int i;
u8 emptySector[BYTES_PER_READ];
// Link the cluster
newCluster = _FAT_fat_linkFreeCluster(partition, cluster);
if (newCluster == CLUSTER_FREE) {
return CLUSTER_FREE;
}
// Clear all the sectors within the cluster
memset (emptySector, 0, BYTES_PER_READ);
for (i = 0; i < partition->sectorsPerCluster; i++) {
_FAT_disc_writeSectors (partition->disc,
_FAT_fat_clusterToSector (partition, newCluster) + i,
1, emptySector);
}
return newCluster;
}
/*----------------------------------------------------------------- /*-----------------------------------------------------------------
_FAT_fat_clearLinks _FAT_fat_clearLinks
frees any cluster used by a file frees any cluster used by a file

4
source/file_allocation_table.h
View File

@ -28,6 +28,9 @@
2006-07-11 - Chishm 2006-07-11 - Chishm
* Original release * Original release
2006-10-01 - Chishm
* Added _FAT_fat_linkFreeClusterCleared to clear a cluster when it is allocated
*/ */
#ifndef _FAT_H #ifndef _FAT_H
@ -48,6 +51,7 @@
u32 _FAT_fat_nextCluster(PARTITION* partition, u32 cluster); u32 _FAT_fat_nextCluster(PARTITION* partition, u32 cluster);
u32 _FAT_fat_linkFreeCluster(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); bool _FAT_fat_clearLinks (PARTITION* partition, u32 cluster);