88 lines
2.7 KiB
C++
88 lines
2.7 KiB
C++
/*
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* Copyright (c) 2013, 2014, 2015, 2022 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.cpp
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* ISO 9660 filesystem implementation.
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*/
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#include <sys/types.h>
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#include <assert.h>
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#include <errno.h>
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#include <stddef.h>
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#include <stdint.h>
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#include <string.h>
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#include <time.h>
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#include <stdio.h> // DEBUG
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#include "block.h"
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#include "device.h"
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#include "filesystem.h"
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#include "inode.h"
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#include "util.h"
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Filesystem::Filesystem(Device* device, const char* mount_path,
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uint64_t pvd_offset)
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{
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// TODO: This should be replaced by the . entry within the root directory
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// so the Rock Ridge extensions are available.
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uint32_t pvd_block_id = pvd_offset / device->block_size;
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this->pvd_block = device->GetBlock(pvd_block_id);
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assert(pvd_block); // TODO: This can fail.
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this->pvd = (struct iso9660_pvd*)
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(pvd_block->block_data + pvd_offset % device->block_size);
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this->root_ino = pvd_offset + offsetof(struct iso9660_pvd, root_dirent);
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this->device = device;
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this->mount_path = mount_path;
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this->block_size = device->block_size;
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this->mru_inode = NULL;
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this->lru_inode = NULL;
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for ( size_t i = 0; i < INODE_HASH_LENGTH; i++ )
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this->hash_inodes[i] = NULL;
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}
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Filesystem::~Filesystem()
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{
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while ( mru_inode )
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delete mru_inode;
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pvd_block->Unref();
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}
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Inode* Filesystem::GetInode(iso9660_ino_t inode_id)
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{
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size_t bin = inode_id % INODE_HASH_LENGTH;
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for ( Inode* iter = hash_inodes[bin]; iter; iter = iter->next_hashed )
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if ( iter->inode_id == inode_id )
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return iter->Refer(), iter;
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uint32_t block_id = inode_id / block_size;
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uint32_t offset = inode_id % block_size;
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Block* block = device->GetBlock(block_id);
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if ( !block )
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return (Inode*) NULL;
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Inode* inode = new Inode(this, inode_id);
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if ( !inode )
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return block->Unref(), (Inode*) NULL;
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inode->data_block = block;
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uint8_t* buf = inode->data_block->block_data + offset;
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inode->data = (struct iso9660_dirent*) buf;
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inode->Prelink();
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inode->Parse();
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return inode;
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}
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