#include?“basic_excel.hpp“
#include?“assert.h“

namespace?YCompoundFiles
{
/**********************************?Start?of?Class?Block?*************************************/
//?PURPOSE:?Manage?a?file?by?treating?it?as?blocks?of?data?of?a?certain?size.
Block::Block（）?:?
	blockSize_（512）?fileSize_（0）?indexEnd_（0）
	filename_（0）?{}

bool?Block::Create（const?wchar_t*?filename）
//?PURPOSE:?Create?a?new?block?file?and?open?it.
//?PURPOSE:?If?file?is?present?truncate?it?and?then?open?it.
//?PROMISE:?Return?true?if?file?is?successfully?created?and?opened?false?if?otherwise.
{
	//?Create?new?file
	size_t?filenameLength?=?wcslen（filename）;
	char*?name?=?new?char[filenameLength+1];
	wcstombs（name?filename?filenameLength）;
	name[filenameLength]?=?0;

	file_.open（name?ios_base::out?|?ios_base::trunc）;
	file_.close（）;
	file_.clear（）;

	//?Open?the?file
	bool?ret?=?this->Open（filename）;
	delete[]?name;
	return?ret;
}

bool?Block::Open（const?wchar_t*?filename?ios_base::openmode?mode）
//?PURPOSE:?Open?an?existing?block?file.
//?PROMISE:?Return?true?if?file?is?successfully?opened?false?if?otherwise.
{
	//?Open?existing?file?for?reading?or?writing?or?both
	size_t?filenameLength?=?wcslen（filename）;
	filename_.resize（filenameLength+1?0）;
	wcstombs（&*（filename_.begin（））?filename?filenameLength）;

	file_.open（&*（filename_.begin（））?mode?|?ios_base::binary）;
	if?（!file_.is_open（））?return?false;

	mode_?=?mode;
	
	//?Calculate?filesize
	if?（mode?&?ios_base::in）
	{
		file_.seekg（0?ios_base::end）;
		fileSize_?=?file_.tellg（）;
	}
	else?if?（mode?&?ios_base::out）
	{
		file_.seekp（0?ios_base::end）;
		fileSize_?=?file_.tellp（）;
	}
	else
	{
		this->Close（）;
		return?false;	
	}
	
	//?Calculate?last?index?+?1
	indexEnd_?=?fileSize_/blockSize_?+?（fileSize_?%?blockSize_???1?:?0）;
	return?true;
}

bool?Block::Close（）
//?PURPOSE:?Close?the?opened?block?file.
//?PROMISE:?Return?true?if?file?is?successfully?closed?false?if?otherwise.
{
	file_.close（）;
	file_.clear（）;
	filename_.clear（）;?
	fileSize_?=?0;?
	indexEnd_?=?0;?
	blockSize_?=?512;
	return?!file_.is_open（）;
}

bool?Block::IsOpen（）
//?PURPOSE:?Check?if?the?block?file?is?still?opened.
//?PROMISE:?Return?true?if?file?is?still?opened?false?if?otherwise.
{
	return?file_.is_open（）;
}

bool?Block::Read（size_t?index?char*?block）
//?PURPOSE:?Read?a?block?of?data?from?the?opened?file?at?the?index?position.
//?EXPLAIN:?index?is?from?[0..].
//?PROMISE:?Return?true?if?data?are?successfully?read?false?if?otherwise.
{
	if?（!（mode_?&?ios_base::in））?return?false;
	if?（index?	{
		file_.seekg（index?*?blockSize_）;
		file_.read（block?blockSize_）;
		return?!file_.fail（）;
	}
	else?return?false;
}

bool?Block::Write（size_t?index?const?char*?block）
//?PURPOSE:?Write?a?block?of?data?to?the?opened?file?at?the?index?position.
//?EXPLAIN:?index?is?from?[0..].
//?PROMISE:?Return?true?if?data?are?successfully?written?false

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----

?????文件?????185821??2012-06-10?22:43??basic_excel\basic_excel.cpp

?????文件??????46476??2012-06-10?22:27??basic_excel\basic_excel.hpp

?????目錄??????????0??2012-06-10?22:43??basic_excel

-----------?---------??----------?-----??----

???????????????232297????????????????????3