bufferstore.h

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/*
 * This file is part of plptools.
 *
 *  Copyright (C) 1999 Philip Proudman <philip.proudman@btinternet.com>
 *  Copyright (C) 1999-2001 Fritz Elfert <felfert@to.com>
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program 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 General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License along
 *  along with this program; if not, see <https://www.gnu.org/licenses/>.
 *
 */
#pragma once
 
#include "config.h"
 
#include <iostream>
#include <cstdint>
 
#include <sys/types.h>
 
class BufferStore {
public:
    BufferStore();
 
    BufferStore(const unsigned char *buf, long len);
 
    ~BufferStore();
 
    BufferStore(const BufferStore &b);
 
    BufferStore &operator =(const BufferStore &);
 
    unsigned long getLen() const;
 
    unsigned char getByte(long pos = 0) const;
 
    uint16_t getWord(long pos = 0) const;
 
    uint32_t getDWord(long pos = 0) const;
 
    int32_t getSDWord(long pos = 0) const;
 
    const char * getString(long pos = 0) const;
 
    void discardFirstBytes(int len = 0);
 
    friend std::ostream &operator<<(std::ostream &s, const BufferStore &m);
 
    bool empty() const;
 
    void init();
 
    void init(const unsigned char * buf, long len);
 
    void addByte(unsigned char c);
 
    void addWord(int w);
 
    void addDWord(long dw);
 
    void addString(const char *s);
 
    void addStringT(const char *s);
 
    void addBytes(const unsigned char *buf, int len);
 
    void addBuff(const BufferStore &b, long maxLen = -1);
 
    void truncate(long newLen);
 
    void prependByte(unsigned char c);
 
    void prependWord(int w);
 
private:
    void checkAllocd(long newLen);
 
    long len;
    long lenAllocd;
    long start;
    unsigned char * buff;
 
    enum c { MIN_LEN = 300 };
};
 
inline bool BufferStore::empty() const {
    return (len - start) == 0;
}