V-Gears/src/common/FileSystem.cpp

/*
 * Copyright (C) 2022 The V-Gears Team
 *
 * This file is part of V-Gears
 *
 * V-Gears is free software: you can redistribute it and/or modify it under
 * terms of the GNU General Public License as published by the Free Software
 * Foundation, version 3.0 (GPLv3) of the License.
 *
 * V-Gears 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.
 */

#include <stdio.h>
#include "common/FileSystem.h"
#include "core/Logger.h"

unsigned int FileSystem::GetFileSize(const Ogre::String &path){
    FILE* file = fopen(path.c_str(), "rb");
    if (file == nullptr){
        LOG_ERROR("Can't open file " + path + ".\n");
        return 0;
    }
    // Set cursor to end of file
    fseek(file, 0, SEEK_END);
    unsigned int size = ftell(file);
    fclose(file);
    return size;
}

bool FileSystem::ReadFile(
  const Ogre::String &path, void* buffer,
  const unsigned int start, const unsigned int length
){
    FILE* file = fopen(path.c_str(), "rb");
    if (file == nullptr){
        LOG_ERROR("Can't open file " + path + ".\n");
        return false;
    }
    fseek(file, start, SEEK_SET);
    const auto ret = fread(buffer, sizeof(char), length, file);
    fclose(file);
    if (ret != sizeof(char) * length){
        LOG_ERROR("Failed to read all data\n");
        return false;
    }
    return true;
}

bool FileSystem::WriteFile(
  const Ogre::String &path, const void* buffer, const unsigned int length
){
    FILE* file = fopen(path.c_str(), "ab");
    if (file == nullptr) return false;
    fwrite(buffer, sizeof(char), length, file);
    fclose(file);
    return true;
}

bool FileSystem::WriteNewFile(
  const Ogre::String &path, const void* buffer, unsigned int length
){
    RemoveFile(path);
    return !! (WriteFile(path, buffer, length));
}

bool FileSystem::RemoveFile(const Ogre::String &path){
    return (remove(path.c_str()) == 0);
}