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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#pragma once
#include <vespa/vespalib/util/bits.h>
namespace vespalib {
/**
* @brief Crc32 class
*
* This has fast Crc32 calculation base on table lookup.
**/
class crc_32_type
{
public:
crc_32_type() : _c(uint32_t(-1)) { }
void process_bytes(const void *start, size_t sz);
uint32_t checksum() const { return _c ^ uint32_t(-1); }
static uint32_t crc(const void * v, size_t sz);
private:
uint32_t _c;
class CrcTableInit
{
public:
CrcTableInit();
static uint32_t crc(uint8_t v);
};
static uint32_t _crc[256];
static CrcTableInit _crcTableInit;
};
}
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