src/mt32/FileStream.cpp

/* Copyright (C) 2003, 2004, 2005, 2006, 2008, 2009 Dean Beeler, Jerome Fisher
 * Copyright (C) 2011, 2012, 2013 Dean Beeler, Jerome Fisher, Sergey V. Mikayev
 *
 *  This program 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 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 Lesser General Public License for more details.
 *
 *  You should have received a copy of the GNU Lesser General Public License
 *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#include "mt32emu.h"
#include "FileStream.h"

namespace MT32Emu {

using std::ifstream;
using std::ios_base;

FileStream::FileStream() {
        ifsp = new ifstream();
}

FileStream::~FileStream() {
        if (ifsp != NULL) {
                delete ifsp; // destructor closes the file itself
        }
        if (data) {
                delete[] data;
        }
}

size_t FileStream::getSize() {
        if (fileSize != 0) {
                return fileSize;
        }
        if (ifsp == NULL) {
                return 0;
        }
        if (!ifsp->is_open()) {
                return 0;
        }
        ifsp->seekg(0, ios_base::end);
        fileSize = (size_t)ifsp->tellg();
        return fileSize;
}

const unsigned char* FileStream::getData() {
        if (data != NULL) {
                return data;
        }
        if (ifsp == NULL) {
                return NULL;
        }
        if (!ifsp->is_open()) {
                return NULL;
        }
        if (getSize() == 0) {
                return NULL;
        }
        data = new unsigned char[fileSize];
        if (data == NULL) {
                return NULL;
        }
        ifsp->seekg(0);
        ifsp->read((char *)data, fileSize);
        if ((size_t)ifsp->tellg() != fileSize) {
                delete[] data;
                data = NULL;
                return NULL;
        }
        return data;
}

bool FileStream::open(const char *filename) {
        if (ifsp) {
                ifsp->open(filename, ios_base::in | ios_base::binary);
        }
        return (ifsp->good());
}

void FileStream::close() {
        ifsp->close();
}

}