// FastMath.h: interface for the CFastMath class.
//
//////////////////////////////////////////////////////////////////////

#ifndef _CUSTOM_MATH_FUNCTIONS_H_
#define _CUSTOM_MATH_FUNCTIONS_H_

#include <winsock2.h>
#include <windows.h>
#include <cmath>


namespace Math
{
    namespace Convert
    {
        extern const unsigned short m_FastHeToBi[0x100];

	    // SPX, IPX ÁÖ¼Ò °è»êÀ» À§ÇØ »ç¿ëÇÏ´Â ÇÔ¼ö
	    inline unsigned char	BiToHe(char cBin);	
	    inline void			    AcToHe(char *szDst, char *szSrc, int iCount);

	    // StringÀ» °ªÀ¸·Î ¹Ù²Þ(StringÀº 0x°¡ ºÙÀº Hex stringÀÌ´Ù.)
	    inline BYTE	    StrToHex08(const char *szSrc);
	    inline WORD     StrToHex16(const char *szSrc);
	    inline DWORD    StrToHex32(const char *szSrc);
	    inline DWORD64  StrToHex64(const char *szSrc);

	    // StringÀ» °ªÀ¸·Î ¹Ù²Þ(0x°¡ ºÙ´øÁö, ºÙÁö ¾Ê´øÁö°£¿¡ ÀüºÎ ¹Ù²Ü ¼ö ÀÖ´Ù)
	    inline BYTE 	Atoc(char *szSrc);
	    inline WORD     Atos(char *szSrc);
	    inline DWORD    Atoi(char *szSrc);
	    inline DWORD64  Atol64(char *szSrc);

	    // °ªÀ» Hex StringÀ¸·Î ¹Ù²Þ
	    inline void     Hex08ToStr(char *szDest, BYTE hex);
	    inline void     Hex16ToStr(char *szDest, WORD hex);
	    inline void     Hex32ToStr(char *szDest, DWORD hex);
	    inline void     Hex64ToStr(char *szDest, DWORD64 hex);
    };

    namespace Random
    {
        // ¸®ÅÏ°ªÀº 0 ~ nExtent - 1ÀÇ ¹üÀ§¸¦ °®´Â´Ù.
	    unsigned long ComplexRandom(int nExtent);	// ºñ±³Àû ºÐÆ÷°¡ ÁÁ´Ù.
    };

    namespace HashFunc
    {
	    // -------------------------------------------------------------------------------------------------
	    // String-to-Hash ÇÔ¼öµé : http://www.cs.yorku.ca/~oz/hash.html ¿¡¼­ Âü°í

	    inline unsigned long djb2Hash(const unsigned char *str);	// first reported by dan bernstein 
	    inline unsigned long sdbmHash(const unsigned char *str);	// this is one of the algorithms used in berkeley db
	    inline unsigned long looseHash(const unsigned char *str);	// °¡Àå °£´ÜÇÑ Çؽ¬. ±×³É ¸ðµÎ ´õÇÔ.
    };
};

#include "Convert.inl"



inline unsigned long Math::HashFunc::djb2Hash(const unsigned char *str)
{
    unsigned long hash = 5381;
    int c;

	while (c = *str++) { hash = ((hash << 5) + hash) + c; /* hash * 33 + c */ }
    return hash;
}


inline unsigned long Math::HashFunc::sdbmHash(const unsigned char *str)
{
    unsigned long hash = 0;
    int c;

	while (c = *str++) { hash = c + (hash << 6) + (hash << 16) - hash; }
    return hash;
}

inline unsigned long Math::HashFunc::looseHash(const unsigned char *str)
{
	unsigned int hash = 0;
	int c;

	while (c = *str++) { hash += c; }
	return hash;
}


#endif // !defined(AFX_FASTMATH_H__ED69578B_18C1_42EA_9C5E_888DC38101C2__INCLUDED_)