89 lines
2.5 KiB
C++
89 lines
2.5 KiB
C++
/*
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* Copyright (c) 2013, 2014, 2015, 2023 Jonas 'Sortie' Termansen.
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*
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* filesystem.h
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* Filesystem.
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*/
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#ifndef FILESYSTEM_H
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#define FILESYSTEM_H
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bool is_8_3(const char* name);
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void encode_8_3(const char* decoded, char encoded[8 + 3]);
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void decode_8_3(const char encoded[8 + 3], char decoded[8 + 1 + 3 + 1]);
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void timespec_to_fat(const struct timespec* ts, uint16_t* date, uint16_t* time,
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uint8_t* tenths);
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// TODO: Unify into the above.
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uint8_t timespec_to_fat_tenths(struct timespec* ts);
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uint16_t timespec_to_fat_time(struct timespec* ts);
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uint16_t timespec_to_fat_date(struct timespec* ts);
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class Device;
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class Inode;
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static const size_t INODE_HASH_LENGTH = 1 << 16;
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class Filesystem
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{
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public:
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Filesystem(Device* device, const char* mount_path);
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~Filesystem();
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public:
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Block* bpb_block;
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struct fat_bpb* bpb;
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Device* device;
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const char* mount_path;
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mode_t mode_reg;
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mode_t mode_dir;
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uid_t uid;
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gid_t gid;
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uint32_t block_size;
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uint16_t bytes_per_sector;
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uint16_t root_dirent_count;
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uint32_t sectors_per_fat;
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uint32_t root_inode_id;
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uint32_t total_sectors;
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uint32_t fat_sector; // TODO: Rename to lba
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uint32_t root_sector; // TODO: Rename to lba
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uint32_t data_sector; // TODO: Rename to lba
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uint32_t cluster_count;
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uint32_t cluster_size;
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uint8_t fat_type;
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uint32_t eio_cluster;
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uint32_t eof_cluster;
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uint32_t free_search;
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Inode* mru_inode;
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Inode* lru_inode;
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Inode* dirty_inode;
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Inode* hash_inodes[INODE_HASH_LENGTH];
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bool dirty;
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public:
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Inode* GetInode(uint32_t inode_id, Block* dirent_block = NULL,
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struct fat_dirent* dirent = NULL);
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uint32_t AllocateCluster();
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void FreeCluster(uint32_t cluster);
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uint32_t ReadFAT(uint32_t cluster);
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bool WriteFAT(uint32_t cluster, uint32_t value);
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uint32_t CalculateFreeCount();
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void BeginWrite();
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void FinishWrite();
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void Sync();
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};
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#endif
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