How to resolve the algorithm CRC-32 step by step in the Quackery programming language

Published on 12 May 2024 09:40 PM
#Quackery

How to resolve the algorithm CRC-32 step by step in the Quackery programming language

Table of Contents

Problem Statement

Demonstrate a method of deriving the Cyclic Redundancy Check from within the language.

The result should be in accordance with ISO 3309, ITU-T V.42, Gzip and PNG. Algorithms are described on Computation of CRC in Wikipedia. This variant of CRC-32 uses LSB-first order, sets the initial CRC to FFFFFFFF16, and complements the final CRC. For the purpose of this task, generate a CRC-32 checksum for the ASCII encoded string:

Let's start with the solution:

Step by Step solution about How to resolve the algorithm CRC-32 step by step in the Quackery programming language

Source code in the quackery programming language

  [ table ]                      is crctable ( n --> n )

  256 times
    [ i^ 8 times
      [ dup 1 >> 
        swap 1 & if
          [ hex EDB88320 ^ ] ]
     ' crctable put ]

  [ hex FFFFFFFF swap
    witheach 
      [ over ^ hex FF & 
        crctable
        swap 8 >> ^ ] 
     hex FFFFFFFF ^ ]            is crc-32   ( [ --> n )

  $ "The quick brown fox jumps over the lazy dog" crc-32
  16 base put 
  echo 
  base release

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