#pragma once
#include "s2t_api.h"


class refer : public IRef
{
	volatile long ref_;

protected:
	refer();
	virtual ~refer();

	// IRef
public:
	COM_API_OVERRIDE(long, add_ref(void));
	COM_API_OVERRIDE(long, release(void));
};

class mapping_buf
{
	unsigned long long	bytes_;
	unsigned long long	offset_;
	unsigned int		page_size_;
	unsigned int		map_unit_;
	unsigned int		mapped_bytes_;
	HANDLE				map_;
	bool				is_mem_;
	unsigned char*		buf_;
	std::string			file_;
	bool				rmv_file_;

	void init_map(const char* file, unsigned long long size);
	void close(void);
	void map(void);
	void set_buffer(unsigned char*& buf, unsigned long long off, unsigned int* bytes);

public:
	mapping_buf();
	~mapping_buf();

public:
	unsigned char* allocate(const wchar_t* file, unsigned long long size = 0);
	unsigned char* buffer(unsigned long long off, unsigned int* bytes);
	bool save(const void* data, size_t* bytes, unsigned long long off);
	int read(void* buf, size_t* bytes, unsigned long long off);
	void unmap();
	void set_remove_file_when_destroyed(bool rmv);
	const char* file(void);
	unsigned long long bytes(void);
	unsigned long long offset(void);
	unsigned int mapped_bytes(void);
};
class scanned_img : public IScanImg, virtual public refer
{
	SANE_Parameters head_;
	mapping_buf*	data_;
	int				dpi_;
	unsigned int	header_size_;
	SANE_FinalImgFormat	fmt_;

	std::string file_header(SANE_ImageType type, float resolution, twain_xfer xfer);

public:
	scanned_img(SANE_Parameters head, SANE_Handle dev, int dpi, const wchar_t* tmp_file
				, twain_xfer xfer = TWAIN_XFER_Native, SANE_FinalImgFormat *fmt = NULL);


protected:
	~scanned_img();

	// IRef
public:
	COM_API_OVERRIDE(long, add_ref(void));
	COM_API_OVERRIDE(long, release(void));

	// IScanImg
public:
	COM_API_OVERRIDE(int, width(void));
	COM_API_OVERRIDE(int, line_bytes(void));
	COM_API_OVERRIDE(int, height(void));
	COM_API_OVERRIDE(int, depth(void));
	COM_API_OVERRIDE(int, channel(void));
	COM_API_OVERRIDE(SANE_Frame, type(void));
	COM_API_OVERRIDE(unsigned int, bytes(void));
	COM_API_OVERRIDE(unsigned int, header_size(void));
	COM_API_OVERRIDE(unsigned char*, data(unsigned long long off, unsigned int* bytes));
	COM_API_OVERRIDE(int, read(void* buf, size_t* bytes, unsigned long long off = 0));
	COM_API_OVERRIDE(const char*, file(void));
	COM_API_OVERRIDE(void, keep_file(bool keep));
	COM_API_OVERRIDE(void, copy_header(SANE_Parameters* head));
};

namespace local_trans
{
	std::string u2a(const wchar_t* unic, UINT cp = CP_ACP);
	std::wstring a2u(const char* asc, UINT cp = CP_ACP);
}