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/* IBM_PROLOG_BEGIN_TAG */
/* This is an automatically generated prolog. */
/* */
/* $Source: src/lib/crc32.C $ */
/* */
/* IBM CONFIDENTIAL */
/* */
/* COPYRIGHT International Business Machines Corp. 2013 */
/* */
/* p1 */
/* */
/* Object Code Only (OCO) source materials */
/* Licensed Internal Code Source Materials */
/* IBM HostBoot Licensed Internal Code */
/* */
/* The source code for this program is not published or otherwise */
/* divested of its trade secrets, irrespective of what has been */
/* deposited with the U.S. Copyright Office. */
/* */
/* Origin: 30 */
/* */
/* IBM_PROLOG_END_TAG */
#include <stdint.h>
#include <util/crc32.H>
namespace Util
{
static const uint64_t CRC32_POLY = 0x104C11DB7ull;
uint32_t crc32_calc(const void* ptr, size_t size)
{
const uint8_t* _ptr = (const uint8_t*)ptr;
uint64_t crc = 0;
while(size)
{
uint64_t data = 0;
for (int i = 0; i < 4; ++i)
{
data <<= 8;
if (size)
{
data |= *(_ptr++);
--size;
}
}
crc <<= 32;
crc ^= (data << 32);
int idx = 0;
do
{
idx = __builtin_clzl(crc);
if (idx < 32)
{
crc ^= (CRC32_POLY << (31 - idx));
}
} while (idx < 32);
}
return crc;
}
};
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