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// --------------------------------------------------------------------------
//
// File
// Name: RollingChecksum.cpp
// Purpose: A simple rolling checksum over a block of data
// Created: 6/12/03
//
// --------------------------------------------------------------------------
#include "Box.h"
#include "RollingChecksum.h"
#include "MemLeakFindOn.h"
// --------------------------------------------------------------------------
//
// Function
// Name: RollingChecksum::RollingChecksum(const void *, unsigned int)
// Purpose: Constructor -- does initial computation of the checksum.
// Created: 6/12/03
//
// --------------------------------------------------------------------------
RollingChecksum::RollingChecksum(const void *data, unsigned int Length)
: a(0),
b(0)
{
uint8_t *block = (uint8_t *)data;
for(unsigned int x = Length; x >= 1; --x)
{
a += (*block);
b += x * (*block);
++block;
}
}
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