FileStream.cpp

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/*******************************************************************************
 *
 * Copyright (c) 2010-2015   Edans Sandes
 *
 * This file is part of MASA-Core.
 * 
 * MASA-Core 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 3 of the License, or
 * (at your option) any later version.
 * 
 * MASA-Core 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 MASA-Core.  If not, see <http://www.gnu.org/licenses/>.
 *
 ******************************************************************************/

#include "FileStream.hpp"


#include <stdlib.h>
#include <stdio.h>

FileStream::FileStream(string filename) {
        FILE* file = fopen(filename.c_str(), "a+b");
        if (file == NULL) {
                fprintf(stderr, "FileStream: Could not create file (%s).\n", filename.c_str());
                exit(1);
        }
        this->file = file;
        this->posRead = 0;
}

FileStream::~FileStream() {
        close();
}

void FileStream::close() {
        if (file != NULL) {
                fclose(file);
                file = NULL;
        }
}

int FileStream::getType() {
        return INIT_WITH_CUSTOM_DATA;
}

int FileStream::read(cell_t* buf, int len) {
        fseek(file, posRead*sizeof(cell_t), SEEK_SET);
        int ret = fread(buf, sizeof(cell_t), len, file);
        if (ret > 0) {
                posRead += ret;
        }
        return ret;
}

int FileStream::write(const cell_t* buf, int len) {
        return fwrite(buf, sizeof(cell_t), len, file);
}

void FileStream::seek(int position) {
        //fseek(file, position*sizeof(cell_t), SEEK_SET);
        posRead = position;
}

int FileStream::getOffset() {
        return posRead;
}