// ZipStorage.h: interface for the CZipStorage class.
//
////////////////////////////////////////////////////////////////////////////////
//  Copyright (C) 2000 Tadeusz Dracz.
//  For conditions of distribution and use, see copyright notice in ZipArchive.h
////////////////////////////////////////////////////////////////////////////////

#if !defined(AFX_ZIPSTORAGE_H__941824FE_3320_4794_BDE3_BE334ED8984B__INCLUDED_)
#define AFX_ZIPSTORAGE_H__941824FE_3320_4794_BDE3_BE334ED8984B__INCLUDED_

#include "ZipBigFile.h"	// Added by ClassView
#include "ZipAutoBuffer.h"	// Added by ClassView
#if _MSC_VER > 1000
#pragma once
#endif // _MSC_VER > 1000

// callback function called when there is a need for a disk change
// calling CZipArchive functions, apart from the static ones, may have unexpected results
// iNumber  - disk number needed
// iCode :
//		-1 - disk needed for reading
// other codes occurs during writting
//		>=0 : number of bytes needed
// 		-2 - the file with the archive name already exists on the disk
//		-3 - the disk is probably write - protected
//		-4 - couldn't create a file
//	pData - user defined data
//	return false to abort operation: the proper exception will be thrown
typedef bool (*ZIPCALLBACKFUN )(int iNumber, int iCode, void* pData);

class CZipStorage  
{
public:
	void Open(CMemFile& mf, int iMode);
// return the position in the file, taking into account the bytes in the write buffer
	DWORD GetPosition();

// flush the data from the read buffer to the disk
	void Flush();

// only called by CZipCentralDir when opening an existing archive
	void UpdateSpanMode(WORD uLastDisk);
// the preset size of the write buffer
	int m_iWriteBufferSize;

// user data to be passed to the callback function
	void* m_pCallbackData;

// function used to change disks during writing to the disk spanning archive
	void NextDisk(int iNeeded, LPCTSTR lpszFileName = NULL);

	void Close(bool bAfterException);

// return the numer of the current disk
	int GetCurrentDisk();

	void SetCurrentDisk(int iNumber);

// change the disk during extract operations
	void ChangeDisk(int iNumber);

// Function name	: IsSpanMode
// Description	    : detect span mode
// Return type		: int 
//		-1 - existing span opened
//		 0 - no span
//		 1 - new span
	int IsSpanMode();

	void Open(LPCTSTR szPathName, int iMode, int iVolumeSize);
	void Write(void *pBuf, DWORD iSize, bool bAtOnce);
	DWORD Read(void* pBuf, DWORD iSize, bool bAtOnce);
	CZipBigFile m_internalfile;
	CFile* m_pFile;
	CZipStorage();
	virtual ~CZipStorage();
	enum {noSpan, pkzipSpan, tdSpan, suggestedAuto, suggestedTd};
	int m_iSpanMode;
	ZIPCALLBACKFUN m_pZIPCALLBACKFUN;
	static char m_gszExtHeaderSignat[];

// open tdspan: last disk number, create tdspan: volume size
// create pkspan: not used
	int m_iTdSpanData;

protected:
// how many bytes left free in the write buffer
	DWORD GetFreeInBuffer();
	friend class CZipCentralDir;
// numer of bytes available in the write buffer
	DWORD m_uBytesInWriteBuffer;

//  tdSpan : the total size of the current volume, pkSpan : free space on the current volume
	DWORD m_uCurrentVolSize;

// return the number of bytes left on the current volume
	DWORD VolumeLeft();

// write data to the internal buffer
	void WriteInternalBuffer(char *pBuf, DWORD uSize);

// number of bytes left free in the write buffer
	DWORD m_uVolumeFreeInBuffer;

	CZipAutoBuffer m_pWriteBuffer;

// return the number of free bytes on the current removable disk
	DWORD GetFreeVolumeSpace();

	void CallCallback(int iCode, CString szTemp);

// only disk spanning creation: tells how many bytes have been written physically to the current volume
	DWORD m_iBytesWritten;

// construct the name of the volume in tdSpan mode
	CString GetTdVolumeName(bool bLast, LPCTSTR lpszZipName = NULL);

// change the disk in tdSpan mode
	CString ChangeTdRead();

// change the disk in pkSpan mode
	CString ChangePkzipRead();

//  you can only add a new files to the new disk spanning archive and only extract 
//	them from the existing one
	bool m_bNewSpan;

	int m_iCurrentDisk;
	bool OpenFile(LPCTSTR lpszName, UINT uFlags, bool bThrow = true);
	void ThrowError(int err);
	
};

#endif // !defined(AFX_ZIPSTORAGE_H__941824FE_3320_4794_BDE3_BE334ED8984B__INCLUDED_)