mirror of
https://github.com/ioquake/jedi-academy.git
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134 lines
5 KiB
C++
134 lines
5 KiB
C++
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/*****************************************************************************
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* name: l_crc.c
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*
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* desc: CRC calculation
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*
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* $Archive: /MissionPack/CODE/botlib/l_crc.c $
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* $Author: Raduffy $
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* $Revision: 1 $
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* $Modtime: 12/20/99 8:42p $
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* $Date: 3/08/00 11:28a $
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*
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*****************************************************************************/
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include "../game/q_shared.h"
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#include "../game/botlib.h"
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#include "be_interface.h" //for botimport.Print
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// FIXME: byte swap?
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// this is a 16 bit, non-reflected CRC using the polynomial 0x1021
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// and the initial and final xor values shown below... in other words, the
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// CCITT standard CRC used by XMODEM
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#define CRC_INIT_VALUE 0xffff
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#define CRC_XOR_VALUE 0x0000
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unsigned short crctable[257] =
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{
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0x0000, 0x1021, 0x2042, 0x3063, 0x4084, 0x50a5, 0x60c6, 0x70e7,
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0x8108, 0x9129, 0xa14a, 0xb16b, 0xc18c, 0xd1ad, 0xe1ce, 0xf1ef,
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0x1231, 0x0210, 0x3273, 0x2252, 0x52b5, 0x4294, 0x72f7, 0x62d6,
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0x9339, 0x8318, 0xb37b, 0xa35a, 0xd3bd, 0xc39c, 0xf3ff, 0xe3de,
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0x2462, 0x3443, 0x0420, 0x1401, 0x64e6, 0x74c7, 0x44a4, 0x5485,
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0xa56a, 0xb54b, 0x8528, 0x9509, 0xe5ee, 0xf5cf, 0xc5ac, 0xd58d,
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0x3653, 0x2672, 0x1611, 0x0630, 0x76d7, 0x66f6, 0x5695, 0x46b4,
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0xb75b, 0xa77a, 0x9719, 0x8738, 0xf7df, 0xe7fe, 0xd79d, 0xc7bc,
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0x48c4, 0x58e5, 0x6886, 0x78a7, 0x0840, 0x1861, 0x2802, 0x3823,
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0xc9cc, 0xd9ed, 0xe98e, 0xf9af, 0x8948, 0x9969, 0xa90a, 0xb92b,
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0x5af5, 0x4ad4, 0x7ab7, 0x6a96, 0x1a71, 0x0a50, 0x3a33, 0x2a12,
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0xdbfd, 0xcbdc, 0xfbbf, 0xeb9e, 0x9b79, 0x8b58, 0xbb3b, 0xab1a,
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0x6ca6, 0x7c87, 0x4ce4, 0x5cc5, 0x2c22, 0x3c03, 0x0c60, 0x1c41,
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0xedae, 0xfd8f, 0xcdec, 0xddcd, 0xad2a, 0xbd0b, 0x8d68, 0x9d49,
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0x7e97, 0x6eb6, 0x5ed5, 0x4ef4, 0x3e13, 0x2e32, 0x1e51, 0x0e70,
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0xff9f, 0xefbe, 0xdfdd, 0xcffc, 0xbf1b, 0xaf3a, 0x9f59, 0x8f78,
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0x9188, 0x81a9, 0xb1ca, 0xa1eb, 0xd10c, 0xc12d, 0xf14e, 0xe16f,
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0x1080, 0x00a1, 0x30c2, 0x20e3, 0x5004, 0x4025, 0x7046, 0x6067,
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0x83b9, 0x9398, 0xa3fb, 0xb3da, 0xc33d, 0xd31c, 0xe37f, 0xf35e,
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0x02b1, 0x1290, 0x22f3, 0x32d2, 0x4235, 0x5214, 0x6277, 0x7256,
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0xb5ea, 0xa5cb, 0x95a8, 0x8589, 0xf56e, 0xe54f, 0xd52c, 0xc50d,
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0x34e2, 0x24c3, 0x14a0, 0x0481, 0x7466, 0x6447, 0x5424, 0x4405,
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0xa7db, 0xb7fa, 0x8799, 0x97b8, 0xe75f, 0xf77e, 0xc71d, 0xd73c,
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0x26d3, 0x36f2, 0x0691, 0x16b0, 0x6657, 0x7676, 0x4615, 0x5634,
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0xd94c, 0xc96d, 0xf90e, 0xe92f, 0x99c8, 0x89e9, 0xb98a, 0xa9ab,
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0x5844, 0x4865, 0x7806, 0x6827, 0x18c0, 0x08e1, 0x3882, 0x28a3,
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0xcb7d, 0xdb5c, 0xeb3f, 0xfb1e, 0x8bf9, 0x9bd8, 0xabbb, 0xbb9a,
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0x4a75, 0x5a54, 0x6a37, 0x7a16, 0x0af1, 0x1ad0, 0x2ab3, 0x3a92,
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0xfd2e, 0xed0f, 0xdd6c, 0xcd4d, 0xbdaa, 0xad8b, 0x9de8, 0x8dc9,
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0x7c26, 0x6c07, 0x5c64, 0x4c45, 0x3ca2, 0x2c83, 0x1ce0, 0x0cc1,
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0xef1f, 0xff3e, 0xcf5d, 0xdf7c, 0xaf9b, 0xbfba, 0x8fd9, 0x9ff8,
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0x6e17, 0x7e36, 0x4e55, 0x5e74, 0x2e93, 0x3eb2, 0x0ed1, 0x1ef0
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};
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//===========================================================================
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//
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// Parameter: -
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// Returns: -
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// Changes Globals: -
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//===========================================================================
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void CRC_Init(unsigned short *crcvalue)
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{
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*crcvalue = CRC_INIT_VALUE;
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} //end of the function CRC_Init
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//===========================================================================
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//
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// Parameter: -
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// Returns: -
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// Changes Globals: -
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//===========================================================================
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void CRC_ProcessByte(unsigned short *crcvalue, byte data)
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{
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*crcvalue = (*crcvalue << 8) ^ crctable[(*crcvalue >> 8) ^ data];
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} //end of the function CRC_ProcessByte
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//===========================================================================
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//
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// Parameter: -
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// Returns: -
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// Changes Globals: -
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//===========================================================================
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unsigned short CRC_Value(unsigned short crcvalue)
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{
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return crcvalue ^ CRC_XOR_VALUE;
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} //end of the function CRC_Value
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//===========================================================================
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//
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// Parameter: -
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// Returns: -
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// Changes Globals: -
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//===========================================================================
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unsigned short CRC_ProcessString(unsigned char *data, int length)
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{
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unsigned short crcvalue;
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int i, ind;
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CRC_Init(&crcvalue);
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for (i = 0; i < length; i++)
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{
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ind = (crcvalue >> 8) ^ data[i];
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if (ind < 0 || ind > 256) ind = 0;
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crcvalue = (crcvalue << 8) ^ crctable[ind];
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} //end for
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return CRC_Value(crcvalue);
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} //end of the function CRC_ProcessString
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//===========================================================================
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//
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// Parameter: -
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// Returns: -
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// Changes Globals: -
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//===========================================================================
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void CRC_ContinueProcessString(unsigned short *crc, char *data, int length)
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{
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int i;
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for (i = 0; i < length; i++)
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{
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*crc = (*crc << 8) ^ crctable[(*crc >> 8) ^ data[i]];
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} //end for
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} //end of the function CRC_ProcessString
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