vcmi/lib/filesystem/MinizipExtensions.h

#pragma once

/*
 * MinizipExtensions.h, part of VCMI engine
 *
 * Authors: listed in file AUTHORS in main folder
 *
 * License: GNU General Public License v2.0 or later
 * Full text of license available in license.txt file, in main folder
 *
 */

#ifdef USE_SYSTEM_MINIZIP
#include <minizip/unzip.h>
#include <minizip/zip.h>
#include <minizip/ioapi.h>
#else
#include "../minizip/unzip.h"
#include "../minizip/zip.h"
#include "../minizip/ioapi.h"
#endif

class CInputOutputStream;
class CMemoryBuffer;

class DLL_LINKAGE CIOApi
{
public:
	virtual ~CIOApi(){};
	
	virtual zlib_filefunc64_def getApiStructure() const;

protected:	
	virtual CInputOutputStream * openFile(const std::string & filename, int mode) const = 0;
	
	///default implementation deletes stream object
	virtual void closeFile(CInputOutputStream * stream) const;
	
private:
	static voidpf ZCALLBACK openFileProxy(voidpf opaque, const void * filename, int mode);
	static uLong ZCALLBACK readFileProxy(voidpf opaque, voidpf stream, void * buf, uLong size);
	static uLong ZCALLBACK writeFileProxy(voidpf opaque, voidpf stream, const void * buf, uLong size);
	static ZPOS64_T ZCALLBACK tellFileProxy(voidpf opaque, voidpf stream);	
	static long ZCALLBACK seekFileProxy(voidpf  opaque, voidpf stream, ZPOS64_T offset, int origin);
	static int ZCALLBACK closeFileProxy(voidpf opaque, voidpf stream);
	static int ZCALLBACK errorFileProxy(voidpf opaque, voidpf stream);
};

///redirects back to minizip ioapi
//todo: replace with Virtual FileSystem interface
class DLL_LINKAGE CDefaultIOApi: public CIOApi
{
public:
	CDefaultIOApi();
	~CDefaultIOApi();
	
	zlib_filefunc64_def getApiStructure() const override;
	
protected:
	CInputOutputStream * openFile(const std::string & filename, int mode) const override;
};

///redirects all file IO to single stream
class DLL_LINKAGE CProxyIOApi: public CIOApi
{
public:
	CProxyIOApi(CInputOutputStream * buffer);
	~CProxyIOApi();
protected:
	CInputOutputStream * openFile(const std::string & filename, int mode) const override;
	void closeFile(CInputOutputStream * stream) const override;
private:
	CInputOutputStream * data;
};