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#include "CRC.h"
extern "C" {
#include "lib/7z/7zCrc.h"
};
static bool crcTableInitialized;
/** @brief Construct a new CRC object. */
CRC::CRC()
{
crc = CRC_INIT_VAL;
if (!crcTableInitialized) {
crcTableInitialized = true;
CrcGenerateTable();
}
}
/** @brief Get the final CRC digest. */
unsigned int CRC::GetDigest() const
{
// make a temporary copy to get away with the const
unsigned int temp = crc;
return CRC_GET_DIGEST(temp);
}
/** @brief Update CRC over the data. */
CRC& CRC::Update(const void* data, unsigned int size)
{
crc = CrcUpdate(crc, data, size);
return *this;
}
/** @brief Update CRC over the 4 bytes of data. */
CRC& CRC::Update(unsigned int data)
{
crc = CrcUpdate(crc, &data, sizeof(unsigned));
return *this;
}
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