ocarina/core/file.cpp

/**
 * Copyright 2013 (c) Anna Schumaker.
 */
#include <core/file.h>
#include <glib.h>

#ifdef CONFIG_TESTING
const std::string OCARINA_DIR = "ocarina-test";
#elif CONFIG_DEBUG
const std::string OCARINA_DIR = "ocarina-debug";
#else
const std::string OCARINA_DIR = "ocarina";
#endif

static const std::string find_ocarina_dir()
{
	std::string res(g_get_user_data_dir());
	res += "/" + OCARINA_DIR;
	return res;
}


file :: file(const std::string &name, unsigned int version)
      : f_mode(NOT_OPEN), f_version(version), f_prev(0), f_name(name)
{
}

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

const std::string file_path(struct file *file)
{
	std::string res = "";

	if (file->f_name != "") {
		res  = find_ocarina_dir();
		res += "/" + file->f_name;
	}
	return res;
}

const unsigned int file_version(struct file *file)
{
	if (file->f_mode == OPEN_READ)
		return file->f_prev;
	return file->f_version;
}

bool file_exists(struct file *file)
{
	return g_file_test(file_path(file).c_str(), G_FILE_TEST_EXISTS);
}

bool file :: _open_read()
{
	if (!file_exists(this))
		return false;

	std::fstream::open(file_path(this).c_str(), std::fstream::in);
	if (std::fstream::fail())
		return false;

	f_mode = OPEN_READ;
	std::fstream::operator>>(f_prev);
	getline();
	return true;
}

bool file :: _open_write()
{
	if (g_mkdir_with_parents(find_ocarina_dir().c_str(), 0755) != 0)
		return false;

	std::fstream::open(file_path(this).c_str(), std::fstream::out);
	if (std::fstream::fail())
		return false;

	f_mode = OPEN_WRITE;
	std::fstream::operator<<(f_version) << std::endl;
	return true;
}

bool file :: open(OpenMode mode)
{
	if ((f_name == "") || (mode == NOT_OPEN) || (f_mode != NOT_OPEN))
		return false;

	else if (mode == OPEN_READ)
		return _open_read();
	else /* mode == OPEN_WRITE */
		return _open_write();
}

void file :: close()
{
	if (f_mode != NOT_OPEN)
		std::fstream::close();
	f_mode = NOT_OPEN;
}

std::string file :: getline()
{
	char c;
	std::string res;

	/* Ignore leading whitespace */
	while (peek() == ' ')
		read(&c, 1);

	std::getline(*static_cast<std::fstream *>(this), res);
	return res;
}