Magic_Game/core/utils/File.cpp

// Copyright (c) 2016-2018 Easy2D - Nomango
// 
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
// 
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.

#include "File.h"
#include "../base/modules.h"
#include <cwctype>

namespace easy2d
{
	std::list<std::wstring>	File::search_paths_;

	File::File()
		: file_path_()
	{
	}

	File::File(std::wstring const& file_name)
		: file_path_(file_name)
	{
		this->Open(file_name);
	}

	File::~File()
	{
	}

	bool File::Open(std::wstring const& file_name)
	{
		if (file_name.empty())
			return false;

		auto FindFile = [](std::wstring const& path) -> bool
		{
			if (modules::Shlwapi().PathFileExistsW(path.c_str()))
				return true;
			return false;
		};

		if (FindFile(file_name))
		{
			file_path_ = file_name;
			return true;
		}

		for (const auto& path : search_paths_)
		{
			if (FindFile(path + file_name))
			{
				file_path_ = path + file_name;
				return true;
			}
		}
		return false;
	}

	bool File::Exists() const
	{
		if (modules::Shlwapi().PathFileExistsW(file_path_.c_str()))
			return true;
		return false;
	}

	std::wstring const& File::GetPath() const
	{
		return file_path_;
	}

	std::wstring File::GetExtension() const
	{
		std::wstring file_ext;
		size_t pos = file_path_.find_last_of(L'.');
		if (pos != std::wstring::npos)
		{
			file_ext = file_path_.substr(pos);
			std::transform(file_ext.begin(), file_ext.end(), file_ext.begin(), std::towlower);
		}
		return file_ext;
	}

	bool File::Delete()
	{
		if (::DeleteFile(file_path_.c_str()))
			return true;
		return false;
	}

	File File::Extract(Resource& res, std::wstring const& dest_file_name)
	{
		File file;
		HANDLE file_handle = ::CreateFile(
			dest_file_name.c_str(),
			GENERIC_WRITE,
			NULL,
			NULL,
			CREATE_ALWAYS,
			FILE_ATTRIBUTE_TEMPORARY,
			NULL
		);

		if (file_handle == INVALID_HANDLE_VALUE)
			return file;

		ResourceData buffer;
		if (res.Load(&buffer))
		{
			// д<><D0B4><EFBFBD>ļ<EFBFBD>
			DWORD written_bytes = 0;
			::WriteFile(file_handle, buffer.buffer, buffer.buffer_size, &written_bytes, NULL);
			::CloseHandle(file_handle);

			file.Open(dest_file_name);
		}
		else
		{
			::CloseHandle(file_handle);
			::DeleteFile(dest_file_name.c_str());
		}

		return file;
	}

	void File::AddSearchPath(std::wstring const& path)
	{
		std::wstring tmp = path;
		size_t pos = 0;
		while ((pos = tmp.find(L"/", pos)) != std::wstring::npos)
		{
			tmp.replace(pos, 1, L"\\");
			pos++;
		}

		if (tmp.at(tmp.length() - 1) != L'\\')
		{
			tmp.append(L"\\");
		}
		auto iter = std::find(search_paths_.cbegin(), search_paths_.cend(), tmp);
		if (iter == search_paths_.cend())
		{
			search_paths_.push_front(tmp);
		}
	}
}