disk.h

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#pragma once
 
#include <stdlib.h>
 
class Disk {
private:
    int     FileDescriptor;                                         
    size_t  Blocks;                                                 
    size_t  Reads;                                                  
    size_t  Writes;                                                 
    size_t  Mounts;                                                 
    void sanity_check(int blocknum, char *data);
 
public:
    const static size_t BLOCK_SIZE = 4096;                          
    Disk() : FileDescriptor(0), Blocks(0), Reads(0), Writes(0), Mounts(0) {}
    
    ~Disk();
 
    void    open(const char *path, size_t nblocks);
 
    size_t  size() const { return Blocks; }
 
    bool    mounted() const { return Mounts > 0; }
 
    void    mount() { Mounts++; }
 
    void    unmount() { if (Mounts > 0) Mounts--; }
 
    void    read(int blocknum, char *data);
    
    void    write(int blocknum, char *data);
};