XrdOucHashVal.cc File Reference

#include "string.h"
#include "strings.h"

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Functions
unsigned long	XrdOucHashVal (const char *KeyVal)
unsigned long	XrdOucHashVal2 (const char *KeyVal, int KeyLen)

Function Documentation

XrdOucHashVal()

unsigned long XrdOucHashVal

(

const char *

KeyVal

)

Definition at line 52 of file XrdOucHashVal.cc.

         {extern unsigned long XrdOucHashVal2(const char *, int);
          return XrdOucHashVal2(KeyVal, strlen(KeyVal));
         }

References XrdOucHashVal2().

Referenced by XrdOucHash< T >::Add(), XrdOucHash< T >::Del(), and XrdOssSys::Stage_RT().

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XrdOucHashVal2()

unsigned long XrdOucHashVal2	(	const char *	KeyVal,
		int	KeyLen )

Definition at line 57 of file XrdOucHashVal.cc.

{  int j;
   const char *cp;
   unsigned long hval = 0;
   int hl = sizeof(hval);
 
// If name is shorter than the hash length, use the name.
//
   if (KeyLen <= hl) return LoadWord(KeyVal, (size_t)KeyLen);
 
// Compute the length of the name and develop starting hash.
//
   hval = KeyLen;
   j = KeyLen % hl; KeyLen /= hl;
   if (j) hval ^= LoadWord(KeyVal);
   cp = &KeyVal[j];
 
// Compute and return the full hash. The key is walked with a byte pointer
// since it is not aligned for unsigned long; LoadWord() does the unaligned
// load, and the word arithmetic happens on the copy.
//
   while(KeyLen--)
        {hval ^= LoadWord(cp);
         cp += hl;
        }
   return (hval ? hval : 1);
}

Referenced by XrdAccCapability::XrdAccCapability(), XrdAccAccess::Access(), XrdOucN2No2p::pfn2lfn(), XrdAccCapability::Privs(), XrdAccCapability::Privs(), and XrdOucHashVal().

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