datahash.cpp

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#include <QByteArray>
#include <QDebug>
#include "datahash.h"

// the hash prime must be < 2^24 for the code below to work correctly
#define HASH_PRIME 12211009

void DataHash::hash(const QString& string, unsigned int &startValue)
{
    QByteArray stringData = string.toUtf8();

    for(int i = 0; i < stringData.size(); i++)
    {
        startValue = ((startValue << 8) + ((unsigned int)stringData[i])) % HASH_PRIME;
    }
}

void DataHash::hash(const void* data, unsigned int size, unsigned int &startValue)
{
    for(unsigned int i = 0; i < size; i++)
    {
        startValue = ((startValue << 8) + ((unsigned char *)data)[i]) % HASH_PRIME;
    }
}

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