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fix cluster over allocation, skip cluster alignment write if already aligned

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This commit is contained in:
Dave Murphy 2009-10-07 19:48:51 +00:00
parent 18d059aaec
commit b7dcf2ce33
1 changed files with 4 additions and 3 deletions
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7
source/fatfile.c
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@ -36,7 +36,6 @@
#include <errno.h> #include <errno.h>
#include <ctype.h> #include <ctype.h>
#include <unistd.h> #include <unistd.h>
#include <stdio.h>
#include "cache.h" #include "cache.h"
#include "file_allocation_table.h" #include "file_allocation_table.h"
@ -728,7 +727,7 @@ ssize_t _FAT_write_r (struct _reent *r, int fd, const char *ptr, size_t len) {
tempVar = remain / BYTES_PER_READ; tempVar = remain / BYTES_PER_READ;
} }
if ((tempVar > 0) && flagNoError) { if ((tempVar > 0 && tempVar < partition->sectorsPerCluster) && flagNoError) {
if (!_FAT_cache_writeSectors (cache, if (!_FAT_cache_writeSectors (cache,
_FAT_fat_clusterToSector (partition, position.cluster) + position.sector, tempVar, ptr)) _FAT_fat_clusterToSector (partition, position.cluster) + position.sector, tempVar, ptr))
{ {
@ -741,6 +740,7 @@ ssize_t _FAT_write_r (struct _reent *r, int fd, const char *ptr, size_t len) {
} }
} }
if ((position.sector >= partition->sectorsPerCluster) && flagNoError && (remain > 0)) { if ((position.sector >= partition->sectorsPerCluster) && flagNoError && (remain > 0)) {
position.sector = 0; position.sector = 0;
tempNextCluster = _FAT_fat_nextCluster(partition, position.cluster); tempNextCluster = _FAT_fat_nextCluster(partition, position.cluster);
@ -757,11 +757,12 @@ ssize_t _FAT_write_r (struct _reent *r, int fd, const char *ptr, size_t len) {
} }
} }
size_t chunkSize = partition->bytesPerCluster;
// Write whole clusters // Write whole clusters
while ((remain >= partition->bytesPerCluster) && flagNoError) { while ((remain >= partition->bytesPerCluster) && flagNoError) {
uint32_t chunkEnd; uint32_t chunkEnd;
uint32_t nextChunkStart = position.cluster; uint32_t nextChunkStart = position.cluster;
size_t chunkSize = 0;
do { do {
chunkEnd = nextChunkStart; chunkEnd = nextChunkStart;