/*
crclib.c - generate crc stuff
Copyright (C) 2007 Uncle Mike
Copyright (C) 2019 a1batross

This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.
*/
#pragma once
#ifndef CRCLIB_H
#define CRCLIB_H

#include "xash3d_types.h"

typedef struct
{
	uint	buf[4];
	uint	bits[2];
	uint	in[16];
} MD5Context_t;

#define CRC32_INIT_VALUE 0xFFFFFFFFUL
#define CRC32_XOR_VALUE  0xFFFFFFFFUL

static inline void CRC32_Init( uint32_t *pulCRC )
{
	*pulCRC = CRC32_INIT_VALUE;
}

static inline uint32_t CRC32_Final( uint32_t pulCRC )
{
	return pulCRC ^ CRC32_XOR_VALUE;
}

byte CRC32_BlockSequence( byte *base, int length, int sequence );
void CRC32_ProcessBuffer( uint32_t *pulCRC, const void *pBuffer, int nBuffer );
void CRC32_ProcessByte( uint32_t *pulCRC, byte ch );

/*
==================
MD5Init

Start MD5 accumulation.  Set bit count to 0 and buffer to mysterious initialization constants.
==================
*/
static inline void MD5Init( MD5Context_t *ctx )
{
	ctx->buf[0] = 0x67452301;
	ctx->buf[1] = 0xefcdab89;
	ctx->buf[2] = 0x98badcfe;
	ctx->buf[3] = 0x10325476;

	ctx->bits[0] = 0;
	ctx->bits[1] = 0;
}

void MD5Update( MD5Context_t *ctx, const byte *buf, uint len );
void MD5Final( byte digest[16], MD5Context_t *ctx );
uint COM_HashKey( const char *string, uint hashSize );
char *MD5_Print( byte hash[16] );

#endif // CRCLIB_H