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change partition->disc to partition->cache (from rodries)

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tantricity 2009-06-06 22:54:40 +00:00
parent 806fc418e0
commit 245ac2fee5
1 changed files with 43 additions and 43 deletions
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86
source/file_allocation_table.c
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@ -4,7 +4,7 @@
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:
@ -40,18 +40,18 @@ uint32_t _FAT_fat_nextCluster(PARTITION* partition, uint32_t cluster)
uint32_t nextCluster = CLUSTER_FREE;
sec_t sector;
int offset;
if (cluster == CLUSTER_FREE) {
return CLUSTER_FREE;
}
switch (partition->filesysType)
switch (partition->filesysType)
{
case FS_UNKNOWN:
return CLUSTER_ERROR;
break;
case FS_FAT12:
case FS_FAT12:
{
u32 nextCluster_h;
sector = partition->fat.fatStart + (((cluster * 3) / 2) / BYTES_PER_READ);
@ -61,7 +61,7 @@ uint32_t _FAT_fat_nextCluster(PARTITION* partition, uint32_t cluster)
_FAT_cache_readLittleEndianValue (partition->cache, &nextCluster, sector, offset, sizeof(u8));
offset++;
if (offset >= BYTES_PER_READ) {
offset = 0;
sector++;
@ -76,7 +76,7 @@ uint32_t _FAT_fat_nextCluster(PARTITION* partition, uint32_t cluster)
} else {
nextCluster &= 0x0FFF;
}
if (nextCluster >= 0x0FF7)
{
nextCluster = CLUSTER_EOF;
@ -87,35 +87,35 @@ uint32_t _FAT_fat_nextCluster(PARTITION* partition, uint32_t cluster)
case FS_FAT16:
sector = partition->fat.fatStart + ((cluster << 1) / BYTES_PER_READ);
offset = (cluster % (BYTES_PER_READ >> 1)) << 1;
_FAT_cache_readLittleEndianValue (partition->cache, &nextCluster, sector, offset, sizeof(u16));
if (nextCluster >= 0xFFF7) {
nextCluster = CLUSTER_EOF;
}
break;
case FS_FAT32:
sector = partition->fat.fatStart + ((cluster << 2) / BYTES_PER_READ);
offset = (cluster % (BYTES_PER_READ >> 2)) << 2;
_FAT_cache_readLittleEndianValue (partition->cache, &nextCluster, sector, offset, sizeof(u32));
if (nextCluster >= 0x0FFFFFF7) {
nextCluster = CLUSTER_EOF;
}
break;
default:
return CLUSTER_ERROR;
break;
}
return nextCluster;
}
/*
writes value into the correct offset within a partition's FAT, based
writes value into the correct offset within a partition's FAT, based
on the cluster number.
*/
static bool _FAT_fat_writeFatEntry (PARTITION* partition, uint32_t cluster, uint32_t value) {
@ -127,13 +127,13 @@ static bool _FAT_fat_writeFatEntry (PARTITION* partition, uint32_t cluster, uint
{
return false;
}
switch (partition->filesysType)
switch (partition->filesysType)
{
case FS_UNKNOWN:
return false;
break;
case FS_FAT12:
sector = partition->fat.fatStart + (((cluster * 3) / 2) / BYTES_PER_READ);
offset = ((cluster * 3) / 2) % BYTES_PER_READ;
@ -155,15 +155,15 @@ static bool _FAT_fat_writeFatEntry (PARTITION* partition, uint32_t cluster, uint
_FAT_cache_writeLittleEndianValue (partition->cache, (value >> 8) & 0xFF, sector, offset, sizeof(u8));
} else {
_FAT_cache_writeLittleEndianValue (partition->cache, value, sector, offset, sizeof(u8));
offset++;
if (offset >= BYTES_PER_READ) {
offset = 0;
sector++;
}
_FAT_cache_readLittleEndianValue (partition->cache, &oldValue, sector, offset, sizeof(u8));
value = ((value >> 8) & 0x0F) | (oldValue & 0xF0);
@ -172,34 +172,34 @@ static bool _FAT_fat_writeFatEntry (PARTITION* partition, uint32_t cluster, uint
}
break;
case FS_FAT16:
sector = partition->fat.fatStart + ((cluster << 1) / BYTES_PER_READ);
offset = (cluster % (BYTES_PER_READ >> 1)) << 1;
offset = (cluster % (BYTES_PER_READ >> 1)) << 1;
_FAT_cache_writeLittleEndianValue (partition->cache, value, sector, offset, sizeof(u16));
break;
case FS_FAT32:
sector = partition->fat.fatStart + ((cluster << 2) / BYTES_PER_READ);
offset = (cluster % (BYTES_PER_READ >> 2)) << 2;
_FAT_cache_writeLittleEndianValue (partition->cache, value, sector, offset, sizeof(u32));
break;
default:
return false;
break;
}
return true;
}
/*-----------------------------------------------------------------
gets the first available free cluster, sets it
to end of file, links the input cluster to it then returns the
to end of file, links the input cluster to it then returns the
cluster number
If an error occurs, return CLUSTER_ERROR
-----------------------------------------------------------------*/
@ -220,7 +220,7 @@ uint32_t _FAT_fat_linkFreeCluster(PARTITION* partition, uint32_t cluster) {
if ((curLink >= CLUSTER_FIRST) && (curLink <= lastCluster)) {
return curLink; // Return the current link - don't allocate a new one
}
// Get a free cluster
firstFree = partition->fat.firstFree;
// Start at first valid cluster
@ -267,7 +267,7 @@ uint32_t _FAT_fat_linkFreeClusterCleared (PARTITION* partition, uint32_t cluster
uint32_t newCluster;
uint32_t i;
uint8_t emptySector[BYTES_PER_READ];
// Link the cluster
newCluster = _FAT_fat_linkFreeCluster(partition, cluster);
@ -278,14 +278,14 @@ uint32_t _FAT_fat_linkFreeClusterCleared (PARTITION* partition, uint32_t cluster
// Clear all the sectors within the cluster
memset (emptySector, 0, BYTES_PER_READ);
for (i = 0; i < partition->sectorsPerCluster; i++) {
_FAT_cache_writeSectors (partition->disc,
_FAT_cache_writeSectors (partition->cache,
_FAT_fat_clusterToSector (partition, newCluster) + i,
1, emptySector);
}
return newCluster;
}
/*-----------------------------------------------------------------
_FAT_fat_clearLinks
@ -293,10 +293,10 @@ frees any cluster used by a file
-----------------------------------------------------------------*/
bool _FAT_fat_clearLinks (PARTITION* partition, uint32_t cluster) {
uint32_t nextCluster;
if ((cluster < CLUSTER_FIRST) || (cluster > partition->fat.lastCluster /* This will catch CLUSTER_ERROR */))
return false;
// If this clears up more space in the FAT before the current free pointer, move it backwards
if (cluster < partition->fat.firstFree) {
partition->fat.firstFree = cluster;
@ -320,13 +320,13 @@ bool _FAT_fat_clearLinks (PARTITION* partition, uint32_t cluster) {
_FAT_fat_trimChain
Drop all clusters past the chainLength.
If chainLength is 0, all clusters are dropped.
If chainLength is 1, the first cluster is kept and the rest are
If chainLength is 1, the first cluster is kept and the rest are
dropped, and so on.
Return the last cluster left in the chain.
-----------------------------------------------------------------*/
uint32_t _FAT_fat_trimChain (PARTITION* partition, uint32_t startCluster, unsigned int chainLength) {
uint32_t nextCluster;
if (chainLength == 0) {
// Drop the entire chain
_FAT_fat_clearLinks (partition, startCluster);
@ -340,15 +340,15 @@ uint32_t _FAT_fat_trimChain (PARTITION* partition, uint32_t startCluster, unsign
startCluster = nextCluster;
nextCluster = _FAT_fat_nextCluster (partition, startCluster);
}
// Drop all clusters after the last in the chain
if (nextCluster != CLUSTER_FREE && nextCluster != CLUSTER_EOF) {
_FAT_fat_clearLinks (partition, nextCluster);
}
// Mark the last cluster in the chain as the end of the file
_FAT_fat_writeFatEntry (partition, startCluster, CLUSTER_EOF);
return startCluster;
}
}
@ -371,13 +371,13 @@ Return the number of free clusters available
unsigned int _FAT_fat_freeClusterCount (PARTITION* partition) {
unsigned int count = 0;
uint32_t curCluster;
for (curCluster = CLUSTER_FIRST; curCluster <= partition->fat.lastCluster; curCluster++) {
if (_FAT_fat_nextCluster(partition, curCluster) == CLUSTER_FREE) {
count++;
}
}
return count;
}