Luna/kernel/include/fs/FileDescriptor.h

#pragma once
#include "fs/VFS.h"
#include <stdint.h>

struct Descriptor
{
    bool is_open()
    {
        return m_is_open;
    }

    bool can_read()
    {
        return m_can_read && m_is_open;
    }

    bool can_write()
    {
        return m_can_write && m_is_open;
    }

    void close()
    {
        m_is_open = false;
    }

    VFS::Node* node()
    {
        return m_node;
    }

    ssize_t read(size_t size, char* buffer);
    ssize_t write(size_t size, const char* buffer);

    uintptr_t mmap(uintptr_t addr, size_t size, int prot, off_t offset);

    void open(VFS::Node* node, bool can_read, bool can_write, bool able_to_block, bool close_on_exec);

    int seek(long offset);
    long offset()
    {
        return (long)m_offset;
    }

    unsigned long length()
    {
        return m_node->length;
    }

    bool able_to_block()
    {
        return m_able_to_block;
    }

    bool close_on_exec()
    {
        return m_close_on_exec;
    }

    void set_close_on_exec(bool value)
    {
        m_close_on_exec = value;
    }

    Descriptor(const Descriptor& other);
    Descriptor();

    const Descriptor& operator=(const Descriptor& other);

  private:
    bool m_is_open;
    bool m_can_read;
    bool m_can_write;
    bool m_able_to_block;
    bool m_close_on_exec;
    VFS::Node* m_node;
    uint64_t m_offset;
};