mirror of
https://github.com/alliedmodders/hl2sdk.git
synced 2025-12-07 10:38:23 +00:00
45 lines
1006 B
C
45 lines
1006 B
C
//========= Copyright © 1996-2005, Valve Corporation, All rights reserved. ============//
|
|
//
|
|
// Purpose: Generic CRC functions
|
|
//
|
|
// $NoKeywords: $
|
|
//=============================================================================//
|
|
#ifndef CHECKSUM_CRC_H
|
|
#define CHECKSUM_CRC_H
|
|
#ifdef _WIN32
|
|
#pragma once
|
|
#endif
|
|
|
|
#include "platform.h"
|
|
|
|
#define CRC32_INIT_VALUE 0xFFFFFFFFUL
|
|
#define CRC32_XOR_VALUE 0xFFFFFFFFUL
|
|
|
|
typedef unsigned long CRC32_t;
|
|
|
|
inline void CRC32_Init( CRC32_t *pulCRC )
|
|
{
|
|
*pulCRC = CRC32_INIT_VALUE;
|
|
}
|
|
|
|
inline void CRC32_Final( CRC32_t *pulCRC )
|
|
{
|
|
*pulCRC ^= CRC32_XOR_VALUE;
|
|
}
|
|
|
|
PLATFORM_INTERFACE void CRC32_ProcessBuffer( CRC32_t *pulCRC, const void *p, int len );
|
|
PLATFORM_INTERFACE CRC32_t CRC32_GetTableEntry( unsigned int slot );
|
|
|
|
inline CRC32_t CRC32_ProcessSingleBuffer( const void *p, int len )
|
|
{
|
|
CRC32_t crc;
|
|
|
|
CRC32_Init( &crc );
|
|
CRC32_ProcessBuffer( &crc, p, len );
|
|
CRC32_Final( &crc );
|
|
|
|
return crc;
|
|
}
|
|
|
|
#endif // CHECKSUM_CRC_H
|