Class output_buffer

extra/yassl/include/buffer.hpp:139–179

output_buffer operates like a smart c style array with a checking option. * Meant to be written to through [] with AUTO index or write(). * Size (current) counter increases when written to. Can be constructed with * zero length buffer but be sure to allocate before first use. * Don't use add write for a couple bytes, use [] instead, way less overhead. * * Not using vector because need che

 * write to the buffer bulk wise and retain correct size
 */
class output_buffer : public NoCheck {
    uint    current_;                // current offset and elements in buffer
    byte*   buffer_;                 // storage for buffer
    byte*   end_;                    // end of storage marker
public:
    // default
    output_buffer();

    // with allocate
    explicit output_buffer(uint s);

    // with assign
    output_buffer(uint s, const byte* t, uint len);

    ~output_buffer();

    uint get_size() const;

    uint get_capacity() const;

    void set_current(uint c);

    // users can pass defualt zero length buffer and then allocate
    void allocate(uint s);

    // for passing to reading functions when finished
    const byte* get_buffer() const;

    // allow write access through [], update current
    // user passes in AUTO as index for ease of use
    byte& operator[](uint i);
    
    // end of output test
    bool eof();

    void write(const byte* t, uint s);

private:
    output_buffer(const output_buffer&);              // hide copy
    output_buffer& operator=(const output_buffer&);   // and assign
};