Functions and Directives Functions and Directives

Function Com_CRC() Foundation

Performs a Cyclic Redundancy Check for strings.

Syntax
Com_CRC( <cString>    , ;
         [<nStart>]   , ;  // Default: 0
         [<nPolynome>]  ;  // Default: 69665
       ) --> nCRCvalue
Return

Returns a 16-bit CRC as a numeric value in the range between 0 and 65536.

Description

Com_CRC() calculates a Cyclic Redundancy Check for a string. The parameter <nStart> can be used to set the start value for the calculation. <nPolynome> can be used to specify the polynome used for the CRC calculation.

Polynomes for CRC
Constant Parameter Polynome
Parity 3 2^1 + 1
LCR_8 257 2^8 + 1
CRC_12 5011 2^12 + 2^11 + 2^3 + 2^2 + 2^1 + 1
CRC_16_X25 69665 2^16 + 2^12 + 2^5 + 1
CRC_16 98309 2^16 + 2^15 + 2^2 + 1

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