#include "Common.h"


unsigned int ELFHash(const char * str, unsigned int len)
{
   unsigned int hash = 0;
   unsigned int x    = 0;
   unsigned int i    = 0;

   for (i = 0; i < len; str++, i++)
   {
      hash = (hash << 4) + (*str);
      if ((x = hash & 0xF0000000L) != 0)
      {
         hash ^= (x >> 24);
      }
      hash &= ~x;
   }

   return hash;
}

// Caution! : 0 ~ RAND_MAX
unsigned _GetRandNum(unsigned nMin, unsigned nMax)
{
	if ((nMin == 0 && nMax == 0) ||
		nMin > nMax)
	{
		//printf("[WARN] Invalide parameter.\n");
		return 0;
	}

	if (nMax > RAND_MAX)
	{
		nMax = RAND_MAX;
		//printf("[WARN] Invalide parameter.\n");
	}

	static bool bRandInit = false;
	if (bRandInit == false)
	{
		bRandInit = true;
		srand((unsigned)time(NULL));
	}

	unsigned nRandNum;
	for (;;)
	{
		nRandNum = (unsigned)rand();

		if (nRandNum >= nMin && nRandNum <= nMax)
			break;
	}

	return nRandNum;
}

bool RealignPathDepth(const char * pszSrc, char * pszDst)
{
	if (pszSrc == NULL || pszDst == NULL)
		return false;
	
	if (pszSrc[0] == '\0')
	{
		pszDst[0] = '\0';
		return true;
	}

	const char * p1 = pszSrc;
	char * p2 = pszDst;

	do
	{
		if (p1[0] == '.' && p1[1] == '.' && p1[2] == '.')
		{
			do 
			{
				if (*p1 == '/' || *p1 == '\\' || *p1 == '\0')
					break;

				*p2++ = *p1;
			} while (p1++);
		}

		if (*p1 == '\0')
			break;
		
		if (p1[0] == '.' && p1[1] == '.' && (p1[2] == '/' || p1[2] == '\\'))
		{
			for (int i = 0; i < 2; i++)
			{
				while (p2 != pszDst && p2--)
				{
					if (*p2 == '/' || *p2 == '\\' || p2 == pszDst)
						break;
				}
			}

			p1 += 2;
		}		
		
		*p2++ = *p1;		
	} while (p1++);

	*p2 = '\0';

	return true;
}