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tantricity 2009-06-30 07:54:49 +00:00
parent 38528ce18f
commit 8ad45f1556
1 changed files with 19 additions and 20 deletions
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39
source/partition.c
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@ -4,7 +4,7 @@
on various block devices.
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:
@ -38,7 +38,7 @@
#include <ctype.h>
#include <sys/iosupport.h>
/*
/*
This device name, as known by devkitPro toolchains
*/
const char* DEVICE_NAME = "fat";
@ -128,7 +128,7 @@ PARTITION* _FAT_partition_constructor (const DISC_INTERFACE* disc, uint32_t cach
if (i == 0x1FE) {
for (i=0x1BE; (i < 0x1FE) && (sectorBuffer[i+0x04] == 0x00); i+= 0x10);
}
if ( i != 0x1FE) {
// Go to first valid partition
startSector = u8array_to_u32(sectorBuffer, 0x8 + i);
@ -147,7 +147,7 @@ PARTITION* _FAT_partition_constructor (const DISC_INTERFACE* disc, uint32_t cach
}
// Now verify that this is indeed a FAT partition
if (memcmp(sectorBuffer + BPB_FAT16_fileSysType, FAT_SIG, sizeof(FAT_SIG)) &&
if (memcmp(sectorBuffer + BPB_FAT16_fileSysType, FAT_SIG, sizeof(FAT_SIG)) &&
memcmp(sectorBuffer + BPB_FAT32_fileSysType, FAT_SIG, sizeof(FAT_SIG)))
{
return NULL;
@ -167,28 +167,28 @@ PARTITION* _FAT_partition_constructor (const DISC_INTERFACE* disc, uint32_t cach
// Init the partition lock
_FAT_lock_init(&partition->lock);
// Set partition's disc interface
partition->disc = disc;
// Store required information about the file system
partition->fat.sectorsPerFat = u8array_to_u16(sectorBuffer, BPB_sectorsPerFAT);
if (partition->fat.sectorsPerFat == 0) {
partition->fat.sectorsPerFat = u8array_to_u32( sectorBuffer, BPB_FAT32_sectorsPerFAT32);
partition->fat.sectorsPerFat = u8array_to_u32( sectorBuffer, BPB_FAT32_sectorsPerFAT32);
}
partition->numberOfSectors = u8array_to_u16( sectorBuffer, BPB_numSectorsSmall);
partition->numberOfSectors = u8array_to_u16( sectorBuffer, BPB_numSectorsSmall);
if (partition->numberOfSectors == 0) {
partition->numberOfSectors = u8array_to_u32( sectorBuffer, BPB_numSectors);
partition->numberOfSectors = u8array_to_u32( sectorBuffer, BPB_numSectors);
}
partition->bytesPerSector = BYTES_PER_READ; // Sector size is redefined to be 512 bytes
partition->sectorsPerCluster = sectorBuffer[BPB_sectorsPerCluster] * u8array_to_u16(sectorBuffer, BPB_bytesPerSector) / BYTES_PER_READ;
partition->bytesPerCluster = partition->bytesPerSector * partition->sectorsPerCluster;
partition->fat.fatStart = startSector + u8array_to_u16(sectorBuffer, BPB_reservedSectors);
partition->fat.fatStart = startSector + u8array_to_u16(sectorBuffer, BPB_reservedSectors);
partition->rootDirStart = partition->fat.fatStart + (sectorBuffer[BPB_numFATs] * partition->fat.sectorsPerFat);
partition->dataStart = partition->rootDirStart +
partition->dataStart = partition->rootDirStart +
(( u8array_to_u16(sectorBuffer, BPB_rootEntries) * DIR_ENTRY_DATA_SIZE) / partition->bytesPerSector);
partition->totalSize = ((uint64_t)partition->numberOfSectors - (partition->dataStart - startSector)) * (uint64_t)partition->bytesPerSector;
@ -210,7 +210,7 @@ PARTITION* _FAT_partition_constructor (const DISC_INTERFACE* disc, uint32_t cach
partition->rootDirCluster = FAT16_ROOT_DIR_CLUSTER;
} else {
// Set up for the FAT32 way
partition->rootDirCluster = u8array_to_u32(sectorBuffer, BPB_FAT32_rootClus);
partition->rootDirCluster = u8array_to_u32(sectorBuffer, BPB_FAT32_rootClus);
// Check if FAT mirroring is enabled
if (!(sectorBuffer[BPB_FAT32_extFlags] & 0x80)) {
// Use the active FAT
@ -223,10 +223,10 @@ PARTITION* _FAT_partition_constructor (const DISC_INTERFACE* disc, uint32_t cach
// Set current directory to the root
partition->cwdCluster = partition->rootDirCluster;
// Check if this disc is writable, and set the readOnly property appropriately
partition->readOnly = !(_FAT_disc_features(disc) & FEATURE_MEDIUM_CANWRITE);
// There are currently no open files on this partition
partition->openFileCount = 0;
partition->firstOpenFile = NULL;
@ -236,7 +236,7 @@ PARTITION* _FAT_partition_constructor (const DISC_INTERFACE* disc, uint32_t cach
void _FAT_partition_destructor (PARTITION* partition) {
FILE_STRUCT* nextFile;
_FAT_lock(&partition->lock);
// Synchronize open files
@ -245,27 +245,26 @@ void _FAT_partition_destructor (PARTITION* partition) {
_FAT_syncToDisc (nextFile);
nextFile = nextFile->nextOpenFile;
}
// Free memory used by the cache, writing it to disc at the same time
_FAT_cache_destructor (partition->cache);
// Unlock the partition and destroy the lock
_FAT_unlock(&partition->lock);
_FAT_lock_deinit(&partition->lock);
// Free memory used by the partition
_FAT_mem_free (partition);
}
PARTITION* _FAT_partition_getPartitionFromPath (const char* path) {
const devoptab_t *devops;
devops = GetDeviceOpTab (path);
if (!devops) {
return NULL;
}
return (PARTITION*)devops->deviceData;
}