ReadBuffer.h

/*
╔══════════════════════════════════════════════════════════════════════════════╗
║                       SIMPLY POWERFUL TOOLKIT (SPTK)                         ║
╟──────────────────────────────────────────────────────────────────────────────╢
║  copyright            © 1999-2022 Alexey Parshin. All rights reserved.       ║
║  email                alexeyp@gmail.com                                      ║
╚══════════════════════════════════════════════════════════════════════════════╝
┌──────────────────────────────────────────────────────────────────────────────┐
│   This library is free software; you can redistribute it and/or modify it    │
│   under the terms of the GNU Library General Public License as published by  │
│   the Free Software Foundation; either version 2 of the License, or (at your │
│   option) any later version.                                                 │
│                                                                              │
│   This library is distributed in the hope that it will be useful, but        │
│   WITHOUT ANY WARRANTY; without even the implied warranty of                 │
│   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Library   │
│   General Public License for more details.                                   │
│                                                                              │
│   You should have received a copy of the GNU Library General Public License  │
│   along with this library; if not, write to the Free Software Foundation,    │
│   Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.               │
│                                                                              │
│   Please report all bugs and problems to alexeyp@gmail.com.                  │
└──────────────────────────────────────────────────────────────────────────────┘
*/
 
#pragma once
 
#include <sptk5/Buffer.h>
 
namespace sptk {
 
class ReadBuffer : public Buffer
{
    size_t  m_readOffset {0};   
 
    void compact()
    {
        if (m_readOffset >= bytes() * 3 / 4) {
            erase(0, m_readOffset);
            m_readOffset = 0;
        }
    }
 
public:
 
    using Buffer::Buffer;
 
    template <typename T>
    bool read(T& data)
    {
        return read((uint8_t*) &data, sizeof(T));
    }
 
    bool read(uint8_t* data, size_t size);
 
    bool read(String& data, size_t length);
 
    bool read(Buffer& data, size_t length);
 
    uint8_t* head()
    {
        return data() + m_readOffset;
    }
 
    size_t available() const
    {
        return bytes() - readOffset();
    }
 
    bool eof() const
    {
        return readOffset() >= bytes();
    }
 
    size_t readOffset() const
    {
        return m_readOffset;
    }
};
 
}