dbuffer.cpp

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/*
Copyright (C) 2002-2020 UFO: Alien Invasion.

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 with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.

*/

#include "common.h"

dbuffer::dbuffer (int reserve) : _length(0)
{
    _data.reserve(reserve);
}

dbuffer::dbuffer (const dbuffer& other)
{
    _data = other._data;
    _length = other._length;
}

dbuffer::~dbuffer ()
{
}

void dbuffer::add (const char* data, size_t len)
{
    _data.insert(_data.begin() + _length, data, data + len);
    _length += len;
}

size_t dbuffer::get (char* data, size_t len) const
{
    if (len > _length) {
        len = _length;
    }
    std::vector<char>::const_iterator copyEnd = _data.begin() + len;
    std::copy(_data.begin(), copyEnd, data);

    return len;
}

size_t dbuffer::getAt (size_t offset, char* data, size_t len) const
{
    if (offset > _length)
        return 0;

    std::vector<char>::const_iterator copyBegin = _data.begin() + offset;
    len = std::min(len, _length - offset);
    std::vector<char>::const_iterator copyEnd = copyBegin + len;
    std::copy(copyBegin, copyEnd, data);

    return len;
}

size_t dbuffer::remove (size_t len)
{
    if (len <= 0) {
        return 0;
    }

    if (len > _length) {
        len = _length;
    }
    std::vector<char>::iterator eraseEnd = _data.begin() + len;
    _data.erase(_data.begin(), eraseEnd);
    _length -= len;
    return len;
}

size_t dbuffer::extract (char* data, size_t len)
{
    len = get(data, len);
    remove(len);
    return len;
}