hash_djb2.h

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/*
    MIT License
 
    Copyright (c) 2025 Robin A. Onsay
 
    Permission is hereby granted, free of charge, to any person obtaining
    a copy of this software and associated documentation files
    (the "Software"), to deal in the Software without restriction,
    including without limitation the rights to use, copy, modify, merge,
    publish, distribute, sublicense, and/or sell copies of the Software,
    and to permit persons to whom the Software is furnished to do so,
    subject to the following conditions:
 
    The above copyright notice and this permission notice shall be
    included in all copies or substantial portions of the Software.
*/
 
#ifndef JUNO_HASH_DJB2_H
#define JUNO_HASH_DJB2_H
#include "juno/status.h"
#include "juno/types.h"
#ifdef __cplusplus
extern "C"
{
#endif
 
 
static inline JUNO_RESULT_SIZE_T JunoHash_Djb2(const uint8_t *pcBuff, size_t zBuffSize)
{
    JUNO_RESULT_SIZE_T tResult = {0, 0};
    if(!(pcBuff))
    {
        tResult.tStatus = JUNO_STATUS_NULLPTR_ERROR;
        return tResult;
    }
    size_t zHash = 5381;
    for(size_t i = 0; i < zBuffSize; i++)
    {
        zHash = ((zHash << 5) + zHash) + pcBuff[i];
    }
    tResult.tStatus = JUNO_STATUS_SUCCESS;
    tResult.tOk = zHash;
    return tResult;
}
#ifdef __cplusplus
}
#endif
#endif // JUNO_HASH_DJB2_H