mem_block_container.h

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class NOVTABLE mem_block_container {
public:
    virtual const void * get_ptr() const = 0;
    virtual void * get_ptr() = 0;
    virtual t_size get_size() const = 0;
    virtual void set_size(t_size p_size) = 0;
    
    void from_stream(stream_reader * p_stream,t_size p_bytes,abort_callback & p_abort);

    void set(const void * p_buffer,t_size p_size);
    void set(const mem_block_container & source) {copy(source);}
    template<typename t_source> void set(const t_source & source) {
        PFC_STATIC_ASSERT( sizeof(source[0]) == 1 );
        set(source.get_ptr(), source.get_size());
    }

    inline void copy(const mem_block_container & p_source) {set(p_source.get_ptr(),p_source.get_size());}
    inline void reset() {set_size(0);}

    const mem_block_container & operator=(const mem_block_container & p_source) {copy(p_source);return *this;}

protected:
    mem_block_container() {}
    ~mem_block_container() {}
};

template<template<typename> class t_alloc = pfc::alloc_standard>
class mem_block_container_impl_t : public mem_block_container {
public:
    const void * get_ptr() const {return m_data.get_ptr();}
    void * get_ptr() {return m_data.get_ptr();}
    t_size get_size() const {return m_data.get_size();}
    void set_size(t_size p_size) {
        m_data.set_size(p_size);
    }
private:
    pfc::array_t<t_uint8,t_alloc> m_data;
};

typedef mem_block_container_impl_t<> mem_block_container_impl;

template<unsigned alignBytes = 16> class mem_block_container_aligned_impl : public mem_block_container {
public:
    const void * get_ptr() const {return m_data.get_ptr();}
    void * get_ptr() {return m_data.get_ptr();}
    t_size get_size() const {return m_data.get_size();}
    void set_size(t_size p_size) {m_data.set_size(p_size);}
private:
    pfc::mem_block_aligned<16> m_data;
};

template<unsigned alignBytes = 16> class mem_block_container_aligned_incremental_impl : public mem_block_container {
public:
    mem_block_container_aligned_incremental_impl() : m_size() {}
    const void * get_ptr() const {return m_data.get_ptr();}
    void * get_ptr() {return m_data.get_ptr();}
    t_size get_size() const {return m_size;}
    void set_size(t_size p_size) {
        if (m_data.size() < p_size) {
            m_data.resize( pfc::multiply_guarded<size_t>(p_size, 3) / 2 );
        }
        m_size = p_size;
    }
private:
    pfc::mem_block_aligned<16> m_data;
    size_t m_size;
};

class mem_block_container_temp_impl : public mem_block_container {
public:
    mem_block_container_temp_impl(void * p_buffer,t_size p_size) : m_buffer(p_buffer), m_buffer_size(p_size), m_size(0) {}
    const void * get_ptr() const {return m_buffer;}
    void * get_ptr() {return m_buffer;}
    t_size get_size() const {return m_size;}
    void set_size(t_size p_size) {if (p_size > m_buffer_size) throw pfc::exception_overflow(); m_size = p_size;}
private:
    t_size m_size,m_buffer_size;
    void * m_buffer;
};

template<typename t_ref>
class mem_block_container_ref_impl : public mem_block_container {
public:
    mem_block_container_ref_impl(t_ref & ref) : m_ref(ref) {
        PFC_STATIC_ASSERT( sizeof(ref[0]) == 1 );
    }
    const void * get_ptr() const {return m_ref.get_ptr();}
    void * get_ptr() {return m_ref.get_ptr();}
    t_size get_size() const {return m_ref.get_size();}
    void set_size(t_size p_size) {m_ref.set_size(p_size);}
private:
    t_ref & m_ref;
};