rawdata.cpp

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/***************************************************************************
 *   Copyright (C) 2005-2019 by the FIFE team                              *
 *   http://www.fifengine.net                                              *
 *   This file is part of FIFE.                                            *
 *                                                                         *
 *   FIFE is free software; you can redistribute it and/or                 *
 *   modify it under the terms of the GNU Lesser General Public            *
 *   License as published by the Free Software Foundation; either          *
 *   version 2.1 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     *
 *   Lesser General Public License for more details.                       *
 *                                                                         *
 *   You should have received a copy of the GNU Lesser General Public      *
 *   License along with this library; if not, write to the                 *
 *   Free Software Foundation, Inc.,                                       *
 *   51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA          *
 ***************************************************************************/

// Standard C++ library includes
#include <algorithm>
#include <vector>
#include <string>

// 3rd party library includes

// FIFE includes
// These includes are split up in two parts, separated by one empty line
// First block: files included from the FIFE root src directory
// Second block: files included from the same folder
#include "util/base/exception.h"
#include "util/log/logger.h"

#include "rawdata.h"

namespace FIFE {
    static Logger _log(LM_VFS);
    
    RawData::RawData(RawDataSource* datasource) : m_datasource(datasource), m_index_current(0) {

    }

    RawData::~RawData() {
        delete m_datasource;
    }

    std::vector<uint8_t> RawData::getDataInBytes() {
        // get the total file size
        uint32_t size = getDataLength();

        // create output vector
        std::vector<uint8_t> target;

        // resize vector to file size
        target.resize(size);

        // read bytes directly into vector
        readInto(&target[0], target.size());

        return target;
    }

    std::vector<std::string> RawData::getDataInLines() {
        std::vector<std::string> target;

        std::string line;
        while (getLine(line)) {
            target.push_back(line);
        }
        return target;
    }

    uint32_t RawData::getDataLength() const {
        return m_datasource->getSize();
    }

    uint32_t RawData::getCurrentIndex() const {
        return m_index_current;
    }

    void RawData::setIndex(uint32_t index) {
        if (index > getDataLength())
            throw IndexOverflow(__FUNCTION__);

        m_index_current = index;
    }

    void RawData::moveIndex(int32_t offset) {
        setIndex(getCurrentIndex() + offset);
    }

    void RawData::readInto(uint8_t* buffer, size_t len) {
        if (m_index_current + len > getDataLength()) {
            FL_LOG(_log, LMsg("RawData") << m_index_current << " : " << len << " : " << getDataLength());
            throw IndexOverflow(__FUNCTION__);
        }

        m_datasource->readInto(buffer, m_index_current, len);
        m_index_current += len;
    }

    uint8_t RawData::read8() {
        return readSingle<uint8_t>();
    }

    uint16_t RawData::read16Little() {
        uint16_t val = readSingle<uint16_t>();
        return littleToHost(val);
    }

    uint32_t RawData::read32Little() {
        uint32_t val = readSingle<uint32_t>();
        return littleToHost(val);
    }

    uint16_t RawData::read16Big() {
        uint16_t val = readSingle<uint16_t>();
        return bigToHost(val);
    }

    uint32_t RawData::read32Big() {
        uint32_t val = readSingle<uint32_t>();
        return bigToHost(val);
    }

    std::string RawData::readString(size_t len) {
        std::vector<uint8_t> strVector;
        strVector.resize(len);
        readInto(&strVector[0], len);

        std::string ret(strVector.begin(), strVector.end());

        return ret;
    }

    void RawData::read(std::string& outbuffer, int32_t size) {
        if ((size < 0) || ((size + m_index_current) > getDataLength())) {
            size = getDataLength() - m_index_current;
        }
        if (size == 0) {
            outbuffer = "";
            return;
        }

        outbuffer.resize(size);

        // read directly into string
        readInto(reinterpret_cast<uint8_t*>(&outbuffer[0]), size);
    }
    

    bool RawData::getLine(std::string& buffer) {
        if (getCurrentIndex() >= getDataLength())
            return false;

        buffer = "";
        char c;
        while (getCurrentIndex() < getDataLength() && (c = read8()) != '\n')
            buffer += c;

        return true;
    }

    bool RawData::littleEndian() {
        static int32_t endian = 2;
        if (endian == 2) {
            uint32_t value = 0x01;
            endian = reinterpret_cast<uint8_t*>(&value)[0];
            FL_LOG(_log, LMsg("RawData") << "we are on a " << (endian == 1 ? "little endian" : "big endian") << " machine");
        }

        return endian == 1;
    }



}//FIFE