mirror of
https://github.com/wiidev/usbloadergx.git
synced 2024-11-15 16:05:10 +01:00
9d46977121
*Made the ProgressWindow for game installation more accurate *Added displaying newly installed games (marked as new) on favorite list, so you don't have to change to full list when installing new games. (Thanks Cyan for the patch) *Lot's a small fixes *Added WDM Menu on game start. You can set it in the alternative DOL option (one new option there). The menu lists all DOLs on the disc and if a wdm file is provided in the WDM path (configurable in the settings) than the dol parameter and dol replacement name will be taken from the wdm. The DOLs that are not listed in the WDM but exist on the DISC will be listed at the end of the list. *Added avoid of multiple app cleanup when game fails to boot *Changed libfat to use FS info sector on FAT32 partitions. This speeds up the free space information getting to instant. For that the FS info sector has to have correct values. The values of all partitions where homebrews were writing to are currently incorrect because the official libfat does not support FS info sector (i submited a patch) (Windows does write it correct though). That is why there needs to be a synchronization of the FS info sector for partitions used with homebrews. For this purpose a new setting was added in the Loader Settings. You can synchronize all your FAT32 partitions on the USB with it once and you are done (if you don't write to that partition with current homebrews). After that you can enable free space display and it will be instant like on WBFS/NTFS/EXT partitions.
387 lines
11 KiB
C
387 lines
11 KiB
C
/*
|
|
file_allocation_table.c
|
|
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.
|
|
*/
|
|
|
|
|
|
#include "file_allocation_table.h"
|
|
#include "partition.h"
|
|
#include <string.h>
|
|
|
|
/*
|
|
Gets the cluster linked from input cluster
|
|
*/
|
|
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)
|
|
{
|
|
case FS_UNKNOWN:
|
|
return CLUSTER_ERROR;
|
|
break;
|
|
|
|
case FS_FAT12:
|
|
{
|
|
u32 nextCluster_h;
|
|
sector = partition->fat.fatStart + (((cluster * 3) / 2) / BYTES_PER_READ);
|
|
offset = ((cluster * 3) / 2) % BYTES_PER_READ;
|
|
|
|
|
|
_FAT_cache_readLittleEndianValue (partition->cache, &nextCluster, sector, offset, sizeof(u8));
|
|
|
|
offset++;
|
|
|
|
if (offset >= BYTES_PER_READ) {
|
|
offset = 0;
|
|
sector++;
|
|
}
|
|
nextCluster_h = 0;
|
|
|
|
_FAT_cache_readLittleEndianValue (partition->cache, &nextCluster_h, sector, offset, sizeof(u8));
|
|
nextCluster |= (nextCluster_h << 8);
|
|
|
|
if (cluster & 0x01) {
|
|
nextCluster = nextCluster >> 4;
|
|
} else {
|
|
nextCluster &= 0x0FFF;
|
|
}
|
|
|
|
if (nextCluster >= 0x0FF7)
|
|
{
|
|
nextCluster = CLUSTER_EOF;
|
|
}
|
|
|
|
break;
|
|
}
|
|
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
|
|
on the cluster number.
|
|
*/
|
|
static bool _FAT_fat_writeFatEntry (PARTITION* partition, uint32_t cluster, uint32_t value) {
|
|
sec_t sector;
|
|
int offset;
|
|
uint32_t oldValue;
|
|
|
|
if ((cluster < CLUSTER_FIRST) || (cluster > partition->fat.lastCluster /* This will catch CLUSTER_ERROR */))
|
|
{
|
|
return false;
|
|
}
|
|
|
|
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;
|
|
|
|
if (cluster & 0x01) {
|
|
|
|
_FAT_cache_readLittleEndianValue (partition->cache, &oldValue, sector, offset, sizeof(u8));
|
|
|
|
value = (value << 4) | (oldValue & 0x0F);
|
|
|
|
_FAT_cache_writeLittleEndianValue (partition->cache, value & 0xFF, sector, offset, sizeof(u8));
|
|
|
|
offset++;
|
|
if (offset >= BYTES_PER_READ) {
|
|
offset = 0;
|
|
sector++;
|
|
}
|
|
|
|
_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);
|
|
|
|
_FAT_cache_writeLittleEndianValue (partition->cache, value, sector, offset, sizeof(u8));
|
|
}
|
|
|
|
break;
|
|
|
|
case FS_FAT16:
|
|
sector = partition->fat.fatStart + ((cluster << 1) / BYTES_PER_READ);
|
|
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
|
|
cluster number
|
|
If an error occurs, return CLUSTER_ERROR
|
|
-----------------------------------------------------------------*/
|
|
uint32_t _FAT_fat_linkFreeCluster(PARTITION* partition, uint32_t cluster) {
|
|
uint32_t firstFree;
|
|
uint32_t curLink;
|
|
uint32_t lastCluster;
|
|
bool loopedAroundFAT = false;
|
|
|
|
lastCluster = partition->fat.lastCluster;
|
|
|
|
if (cluster > lastCluster) {
|
|
return CLUSTER_ERROR;
|
|
}
|
|
|
|
// Check if the cluster already has a link, and return it if so
|
|
curLink = _FAT_fat_nextCluster(partition, 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
|
|
if (firstFree < CLUSTER_FIRST) {
|
|
firstFree = CLUSTER_FIRST;
|
|
}
|
|
|
|
// Search until a free cluster is found
|
|
while (_FAT_fat_nextCluster(partition, firstFree) != CLUSTER_FREE) {
|
|
firstFree++;
|
|
if (firstFree > lastCluster) {
|
|
if (loopedAroundFAT) {
|
|
// If couldn't get a free cluster then return an error
|
|
partition->fat.firstFree = firstFree;
|
|
return CLUSTER_ERROR;
|
|
} else {
|
|
// Try looping back to the beginning of the FAT
|
|
// This was suggested by loopy
|
|
firstFree = CLUSTER_FIRST;
|
|
loopedAroundFAT = true;
|
|
}
|
|
}
|
|
}
|
|
partition->fat.firstFree = firstFree;
|
|
partition->fat.numberFreeCluster--;
|
|
partition->fat.numberLastAllocCluster = firstFree;
|
|
|
|
if ((cluster >= CLUSTER_FIRST) && (cluster <= lastCluster))
|
|
{
|
|
// Update the linked from FAT entry
|
|
_FAT_fat_writeFatEntry (partition, cluster, firstFree);
|
|
}
|
|
// Create the linked to FAT entry
|
|
_FAT_fat_writeFatEntry (partition, firstFree, CLUSTER_EOF);
|
|
|
|
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_ERROR
|
|
-----------------------------------------------------------------*/
|
|
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);
|
|
|
|
if (newCluster == CLUSTER_FREE || newCluster == CLUSTER_ERROR) {
|
|
return CLUSTER_ERROR;
|
|
}
|
|
|
|
// Clear all the sectors within the cluster
|
|
memset (emptySector, 0, BYTES_PER_READ);
|
|
for (i = 0; i < partition->sectorsPerCluster; i++) {
|
|
_FAT_cache_writeSectors (partition->cache,
|
|
_FAT_fat_clusterToSector (partition, newCluster) + i,
|
|
1, emptySector);
|
|
}
|
|
|
|
return newCluster;
|
|
}
|
|
|
|
|
|
/*-----------------------------------------------------------------
|
|
_FAT_fat_clearLinks
|
|
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;
|
|
}
|
|
|
|
while ((cluster != CLUSTER_EOF) && (cluster != CLUSTER_FREE) && (cluster != CLUSTER_ERROR)) {
|
|
// Store next cluster before erasing the link
|
|
nextCluster = _FAT_fat_nextCluster (partition, cluster);
|
|
|
|
// Erase the link
|
|
_FAT_fat_writeFatEntry (partition, cluster, CLUSTER_FREE);
|
|
|
|
partition->fat.numberFreeCluster++;
|
|
// Move onto next cluster
|
|
cluster = nextCluster;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
/*-----------------------------------------------------------------
|
|
_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
|
|
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);
|
|
return CLUSTER_FREE;
|
|
} else {
|
|
// Find the last cluster in the chain, and the one after it
|
|
chainLength--;
|
|
nextCluster = _FAT_fat_nextCluster (partition, startCluster);
|
|
while ((chainLength > 0) && (nextCluster != CLUSTER_FREE) && (nextCluster != CLUSTER_EOF)) {
|
|
chainLength--;
|
|
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;
|
|
}
|
|
}
|
|
|
|
/*-----------------------------------------------------------------
|
|
_FAT_fat_lastCluster
|
|
Trace the cluster links until the last one is found
|
|
-----------------------------------------------------------------*/
|
|
uint32_t _FAT_fat_lastCluster (PARTITION* partition, uint32_t cluster) {
|
|
while ((_FAT_fat_nextCluster(partition, cluster) != CLUSTER_FREE) && (_FAT_fat_nextCluster(partition, cluster) != CLUSTER_EOF)) {
|
|
cluster = _FAT_fat_nextCluster(partition, cluster);
|
|
}
|
|
return cluster;
|
|
}
|
|
|
|
/*-----------------------------------------------------------------
|
|
_FAT_fat_freeClusterCount
|
|
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;
|
|
}
|
|
|