From 9f7c3edc44df9d05218610a823a5b8da5647173f Mon Sep 17 00:00:00 2001 From: tantricity Date: Sat, 17 Oct 2009 18:59:17 +0000 Subject: [PATCH] correct mixed line endings --- source/partition.c | 616 ++++++++++++++++++++++----------------------- 1 file changed, 308 insertions(+), 308 deletions(-) diff --git a/source/partition.c b/source/partition.c index dc137f5..7326024 100644 --- a/source/partition.c +++ b/source/partition.c @@ -1,308 +1,308 @@ -/* - partition.c - Functions for mounting and dismounting partitions - 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: - - 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 "partition.h" -#include "bit_ops.h" -#include "file_allocation_table.h" -#include "directory.h" -#include "mem_allocate.h" -#include "fatfile.h" - -#include -#include -#include - -/* -This device name, as known by devkitPro toolchains -*/ -const char* DEVICE_NAME = "fat"; - -/* -Data offsets -*/ - -// BIOS Parameter Block offsets -enum BPB { - BPB_jmpBoot = 0x00, - BPB_OEMName = 0x03, - // BIOS Parameter Block - BPB_bytesPerSector = 0x0B, - BPB_sectorsPerCluster = 0x0D, - BPB_reservedSectors = 0x0E, - BPB_numFATs = 0x10, - BPB_rootEntries = 0x11, - BPB_numSectorsSmall = 0x13, - BPB_mediaDesc = 0x15, - BPB_sectorsPerFAT = 0x16, - BPB_sectorsPerTrk = 0x18, - BPB_numHeads = 0x1A, - BPB_numHiddenSectors = 0x1C, - BPB_numSectors = 0x20, - // Ext BIOS Parameter Block for FAT16 - BPB_FAT16_driveNumber = 0x24, - BPB_FAT16_reserved1 = 0x25, - BPB_FAT16_extBootSig = 0x26, - BPB_FAT16_volumeID = 0x27, - BPB_FAT16_volumeLabel = 0x2B, - BPB_FAT16_fileSysType = 0x36, - // Bootcode - BPB_FAT16_bootCode = 0x3E, - // FAT32 extended block - BPB_FAT32_sectorsPerFAT32 = 0x24, - BPB_FAT32_extFlags = 0x28, - BPB_FAT32_fsVer = 0x2A, - BPB_FAT32_rootClus = 0x2C, - BPB_FAT32_fsInfo = 0x30, - BPB_FAT32_bkBootSec = 0x32, - // Ext BIOS Parameter Block for FAT32 - BPB_FAT32_driveNumber = 0x40, - BPB_FAT32_reserved1 = 0x41, - BPB_FAT32_extBootSig = 0x42, - BPB_FAT32_volumeID = 0x43, - BPB_FAT32_volumeLabel = 0x47, - BPB_FAT32_fileSysType = 0x52, - // Bootcode - BPB_FAT32_bootCode = 0x5A, - BPB_bootSig_55 = 0x1FE, - BPB_bootSig_AA = 0x1FF -}; - -static const char FAT_SIG[3] = {'F', 'A', 'T'}; - - -sec_t FindFirstValidPartition(const DISC_INTERFACE* disc) -{ - uint8_t part_table[16*4]; - uint8_t *ptr; - int i; - - uint8_t sectorBuffer[BYTES_PER_READ] = {0}; - - // Read first sector of disc - if (!_FAT_disc_readSectors (disc, 0, 1, sectorBuffer)) { - return 0; - } - - memcpy(part_table,sectorBuffer+0x1BE,16*4); - ptr = part_table; - - for(i=0;i<4;i++,ptr+=16) { - sec_t part_lba = u8array_to_u32(ptr, 0x8); - - if (!memcmp(sectorBuffer + BPB_FAT16_fileSysType, FAT_SIG, sizeof(FAT_SIG)) || - !memcmp(sectorBuffer + BPB_FAT32_fileSysType, FAT_SIG, sizeof(FAT_SIG))) { - return part_lba; - } - - if(ptr[4]==0) continue; - - if(ptr[4]==0x0F) { - sec_t part_lba2=part_lba; - sec_t next_lba2=0; - int n; - - for(n=0;n<8;n++) // max 8 logic partitions - { - if(!_FAT_disc_readSectors (disc, part_lba+next_lba2, 1, sectorBuffer)) return 0; - - part_lba2 = part_lba + next_lba2 + u8array_to_u32(sectorBuffer, 0x1C6) ; - next_lba2 = u8array_to_u32(sectorBuffer, 0x1D6); - - if(!_FAT_disc_readSectors (disc, part_lba2, 1, sectorBuffer)) return 0; - - if (!memcmp(sectorBuffer + BPB_FAT16_fileSysType, FAT_SIG, sizeof(FAT_SIG)) || - !memcmp(sectorBuffer + BPB_FAT32_fileSysType, FAT_SIG, sizeof(FAT_SIG))) - { - return part_lba2; - } - - if(next_lba2==0) break; - } - } else { - if(!_FAT_disc_readSectors (disc, part_lba, 1, sectorBuffer)) return 0; - if (!memcmp(sectorBuffer + BPB_FAT16_fileSysType, FAT_SIG, sizeof(FAT_SIG)) || - !memcmp(sectorBuffer + BPB_FAT32_fileSysType, FAT_SIG, sizeof(FAT_SIG))) { - return part_lba; - } - } - } - return 0; -} - -PARTITION* _FAT_partition_constructor (const DISC_INTERFACE* disc, uint32_t cacheSize, uint32_t sectorsPerPage, sec_t startSector) { - PARTITION* partition; - uint8_t sectorBuffer[BYTES_PER_READ] = {0}; - - // Read first sector of disc - if (!_FAT_disc_readSectors (disc, startSector, 1, sectorBuffer)) { - return NULL; - } - - // Make sure it is a valid MBR or boot sector - if ( (sectorBuffer[BPB_bootSig_55] != 0x55) || (sectorBuffer[BPB_bootSig_AA] != 0xAA)) { - return NULL; - } - - if (startSector != 0) { - // We're told where to start the partition, so just accept it - } else if (!memcmp(sectorBuffer + BPB_FAT16_fileSysType, FAT_SIG, sizeof(FAT_SIG))) { - // Check if there is a FAT string, which indicates this is a boot sector - startSector = 0; - } else if (!memcmp(sectorBuffer + BPB_FAT32_fileSysType, FAT_SIG, sizeof(FAT_SIG))) { - // Check for FAT32 - startSector = 0; - } else { - startSector = FindFirstValidPartition(disc); - if (!_FAT_disc_readSectors (disc, startSector, 1, sectorBuffer)) { - return NULL; - } - } - - // Now verify that this is indeed a FAT partition - if (memcmp(sectorBuffer + BPB_FAT16_fileSysType, FAT_SIG, sizeof(FAT_SIG)) && - memcmp(sectorBuffer + BPB_FAT32_fileSysType, FAT_SIG, sizeof(FAT_SIG))) - { - return NULL; - } - - // check again for the last two cases to make sure that we really have a FAT filesystem here - // and won't corrupt any data - if(memcmp(sectorBuffer + BPB_FAT16_fileSysType, "FAT", 3) != 0 && memcmp(sectorBuffer + BPB_FAT32_fileSysType, "FAT32", 5) != 0) - { - return NULL; - } - - partition = (PARTITION*) _FAT_mem_allocate (sizeof(PARTITION)); - if (partition == NULL) { - return NULL; - } - - // 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->numberOfSectors = u8array_to_u16( sectorBuffer, BPB_numSectorsSmall); - if (partition->numberOfSectors == 0) { - 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->rootDirStart = partition->fat.fatStart + (sectorBuffer[BPB_numFATs] * partition->fat.sectorsPerFat); - 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; - - // Store info about FAT - uint32_t clusterCount = (partition->numberOfSectors - (uint32_t)(partition->dataStart - startSector)) / partition->sectorsPerCluster; - partition->fat.lastCluster = clusterCount + CLUSTER_FIRST - 1; - partition->fat.firstFree = CLUSTER_FIRST; - - if (clusterCount < CLUSTERS_PER_FAT12) { - partition->filesysType = FS_FAT12; // FAT12 volume - } else if (clusterCount < CLUSTERS_PER_FAT16) { - partition->filesysType = FS_FAT16; // FAT16 volume - } else { - partition->filesysType = FS_FAT32; // FAT32 volume - } - - if (partition->filesysType != FS_FAT32) { - partition->rootDirCluster = FAT16_ROOT_DIR_CLUSTER; - } else { - // Set up for the FAT32 way - 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 - partition->fat.fatStart = partition->fat.fatStart + ( partition->fat.sectorsPerFat * (sectorBuffer[BPB_FAT32_extFlags] & 0x0F)); - } - } - - // Create a cache to use - partition->cache = _FAT_cache_constructor (cacheSize, sectorsPerPage, partition->disc, startSector+partition->numberOfSectors); - - // 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; - - return partition; -} - -void _FAT_partition_destructor (PARTITION* partition) { - FILE_STRUCT* nextFile; - - _FAT_lock(&partition->lock); - - // Synchronize open files - nextFile = partition->firstOpenFile; - while (nextFile) { - _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; -} +/* + partition.c + Functions for mounting and dismounting partitions + 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: + + 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 "partition.h" +#include "bit_ops.h" +#include "file_allocation_table.h" +#include "directory.h" +#include "mem_allocate.h" +#include "fatfile.h" + +#include +#include +#include + +/* +This device name, as known by devkitPro toolchains +*/ +const char* DEVICE_NAME = "fat"; + +/* +Data offsets +*/ + +// BIOS Parameter Block offsets +enum BPB { + BPB_jmpBoot = 0x00, + BPB_OEMName = 0x03, + // BIOS Parameter Block + BPB_bytesPerSector = 0x0B, + BPB_sectorsPerCluster = 0x0D, + BPB_reservedSectors = 0x0E, + BPB_numFATs = 0x10, + BPB_rootEntries = 0x11, + BPB_numSectorsSmall = 0x13, + BPB_mediaDesc = 0x15, + BPB_sectorsPerFAT = 0x16, + BPB_sectorsPerTrk = 0x18, + BPB_numHeads = 0x1A, + BPB_numHiddenSectors = 0x1C, + BPB_numSectors = 0x20, + // Ext BIOS Parameter Block for FAT16 + BPB_FAT16_driveNumber = 0x24, + BPB_FAT16_reserved1 = 0x25, + BPB_FAT16_extBootSig = 0x26, + BPB_FAT16_volumeID = 0x27, + BPB_FAT16_volumeLabel = 0x2B, + BPB_FAT16_fileSysType = 0x36, + // Bootcode + BPB_FAT16_bootCode = 0x3E, + // FAT32 extended block + BPB_FAT32_sectorsPerFAT32 = 0x24, + BPB_FAT32_extFlags = 0x28, + BPB_FAT32_fsVer = 0x2A, + BPB_FAT32_rootClus = 0x2C, + BPB_FAT32_fsInfo = 0x30, + BPB_FAT32_bkBootSec = 0x32, + // Ext BIOS Parameter Block for FAT32 + BPB_FAT32_driveNumber = 0x40, + BPB_FAT32_reserved1 = 0x41, + BPB_FAT32_extBootSig = 0x42, + BPB_FAT32_volumeID = 0x43, + BPB_FAT32_volumeLabel = 0x47, + BPB_FAT32_fileSysType = 0x52, + // Bootcode + BPB_FAT32_bootCode = 0x5A, + BPB_bootSig_55 = 0x1FE, + BPB_bootSig_AA = 0x1FF +}; + +static const char FAT_SIG[3] = {'F', 'A', 'T'}; + + +sec_t FindFirstValidPartition(const DISC_INTERFACE* disc) +{ + uint8_t part_table[16*4]; + uint8_t *ptr; + int i; + + uint8_t sectorBuffer[BYTES_PER_READ] = {0}; + + // Read first sector of disc + if (!_FAT_disc_readSectors (disc, 0, 1, sectorBuffer)) { + return 0; + } + + memcpy(part_table,sectorBuffer+0x1BE,16*4); + ptr = part_table; + + for(i=0;i<4;i++,ptr+=16) { + sec_t part_lba = u8array_to_u32(ptr, 0x8); + + if (!memcmp(sectorBuffer + BPB_FAT16_fileSysType, FAT_SIG, sizeof(FAT_SIG)) || + !memcmp(sectorBuffer + BPB_FAT32_fileSysType, FAT_SIG, sizeof(FAT_SIG))) { + return part_lba; + } + + if(ptr[4]==0) continue; + + if(ptr[4]==0x0F) { + sec_t part_lba2=part_lba; + sec_t next_lba2=0; + int n; + + for(n=0;n<8;n++) // max 8 logic partitions + { + if(!_FAT_disc_readSectors (disc, part_lba+next_lba2, 1, sectorBuffer)) return 0; + + part_lba2 = part_lba + next_lba2 + u8array_to_u32(sectorBuffer, 0x1C6) ; + next_lba2 = u8array_to_u32(sectorBuffer, 0x1D6); + + if(!_FAT_disc_readSectors (disc, part_lba2, 1, sectorBuffer)) return 0; + + if (!memcmp(sectorBuffer + BPB_FAT16_fileSysType, FAT_SIG, sizeof(FAT_SIG)) || + !memcmp(sectorBuffer + BPB_FAT32_fileSysType, FAT_SIG, sizeof(FAT_SIG))) + { + return part_lba2; + } + + if(next_lba2==0) break; + } + } else { + if(!_FAT_disc_readSectors (disc, part_lba, 1, sectorBuffer)) return 0; + if (!memcmp(sectorBuffer + BPB_FAT16_fileSysType, FAT_SIG, sizeof(FAT_SIG)) || + !memcmp(sectorBuffer + BPB_FAT32_fileSysType, FAT_SIG, sizeof(FAT_SIG))) { + return part_lba; + } + } + } + return 0; +} + +PARTITION* _FAT_partition_constructor (const DISC_INTERFACE* disc, uint32_t cacheSize, uint32_t sectorsPerPage, sec_t startSector) { + PARTITION* partition; + uint8_t sectorBuffer[BYTES_PER_READ] = {0}; + + // Read first sector of disc + if (!_FAT_disc_readSectors (disc, startSector, 1, sectorBuffer)) { + return NULL; + } + + // Make sure it is a valid MBR or boot sector + if ( (sectorBuffer[BPB_bootSig_55] != 0x55) || (sectorBuffer[BPB_bootSig_AA] != 0xAA)) { + return NULL; + } + + if (startSector != 0) { + // We're told where to start the partition, so just accept it + } else if (!memcmp(sectorBuffer + BPB_FAT16_fileSysType, FAT_SIG, sizeof(FAT_SIG))) { + // Check if there is a FAT string, which indicates this is a boot sector + startSector = 0; + } else if (!memcmp(sectorBuffer + BPB_FAT32_fileSysType, FAT_SIG, sizeof(FAT_SIG))) { + // Check for FAT32 + startSector = 0; + } else { + startSector = FindFirstValidPartition(disc); + if (!_FAT_disc_readSectors (disc, startSector, 1, sectorBuffer)) { + return NULL; + } + } + + // Now verify that this is indeed a FAT partition + if (memcmp(sectorBuffer + BPB_FAT16_fileSysType, FAT_SIG, sizeof(FAT_SIG)) && + memcmp(sectorBuffer + BPB_FAT32_fileSysType, FAT_SIG, sizeof(FAT_SIG))) + { + return NULL; + } + + // check again for the last two cases to make sure that we really have a FAT filesystem here + // and won't corrupt any data + if(memcmp(sectorBuffer + BPB_FAT16_fileSysType, "FAT", 3) != 0 && memcmp(sectorBuffer + BPB_FAT32_fileSysType, "FAT32", 5) != 0) + { + return NULL; + } + + partition = (PARTITION*) _FAT_mem_allocate (sizeof(PARTITION)); + if (partition == NULL) { + return NULL; + } + + // 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->numberOfSectors = u8array_to_u16( sectorBuffer, BPB_numSectorsSmall); + if (partition->numberOfSectors == 0) { + 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->rootDirStart = partition->fat.fatStart + (sectorBuffer[BPB_numFATs] * partition->fat.sectorsPerFat); + 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; + + // Store info about FAT + uint32_t clusterCount = (partition->numberOfSectors - (uint32_t)(partition->dataStart - startSector)) / partition->sectorsPerCluster; + partition->fat.lastCluster = clusterCount + CLUSTER_FIRST - 1; + partition->fat.firstFree = CLUSTER_FIRST; + + if (clusterCount < CLUSTERS_PER_FAT12) { + partition->filesysType = FS_FAT12; // FAT12 volume + } else if (clusterCount < CLUSTERS_PER_FAT16) { + partition->filesysType = FS_FAT16; // FAT16 volume + } else { + partition->filesysType = FS_FAT32; // FAT32 volume + } + + if (partition->filesysType != FS_FAT32) { + partition->rootDirCluster = FAT16_ROOT_DIR_CLUSTER; + } else { + // Set up for the FAT32 way + 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 + partition->fat.fatStart = partition->fat.fatStart + ( partition->fat.sectorsPerFat * (sectorBuffer[BPB_FAT32_extFlags] & 0x0F)); + } + } + + // Create a cache to use + partition->cache = _FAT_cache_constructor (cacheSize, sectorsPerPage, partition->disc, startSector+partition->numberOfSectors); + + // 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; + + return partition; +} + +void _FAT_partition_destructor (PARTITION* partition) { + FILE_STRUCT* nextFile; + + _FAT_lock(&partition->lock); + + // Synchronize open files + nextFile = partition->firstOpenFile; + while (nextFile) { + _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; +}