* Copyright 2004-2007, Ingo Weinhold <ingo_weinhold@gmx.de>. All rights reserved.
* Distributed under the terms of the MIT License.
*/
#ifndef HASH_STRING_H
#define HASH_STRING_H
#include <SupportDefs.h>
static inline uint32
string_hash(const char *_string)
{
const uint8* string = (const uint8*)_string;
if (string == NULL)
return 0;
uint32 h = 5381;
char c;
while ((c = *string++) != 0)
h = (h * 33) + c;
return h;
}
namespace BPrivate {
class HashString {
public:
HashString();
HashString(const HashString &string);
HashString(const char *string, int32 length = -1);
~HashString();
bool SetTo(const char *string, int32 maxLength = -1);
void Unset();
void Truncate(int32 newLength);
const char *GetString() const;
int32 GetLength() const { return fLength; }
uint32 GetHashCode() const { return string_hash(GetString()); }
HashString &operator=(const HashString &string);
bool operator==(const HashString &string) const;
bool operator!=(const HashString &string) const { return !(*this == string); }
private:
bool _SetTo(const char *string, int32 length);
private:
int32 fLength;
char *fString;
};
}
using BPrivate::HashString;
#endif
