/*
 * 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 {


// HashString
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;
};


}       // namespace BPrivate


using BPrivate::HashString;


#endif  // HASH_STRING_H