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Nom du fichier : OMcrc32.php
Taille du fichier : 2 Ko (73 lignes)
Language : PHP
  1. span style="color: #808080; font-style: italic;">/*
  2.  * CRC32 calculation for big files : avoids loading whole file in RAM
  3.  *
  4.  * Author/Copyright : Olivier MATHERET
  5.  *   matheret@free.fr  http://matheret.free.fr
  6.  * Licenced under CeCILL2
  7.  *
  8.  * Based on :
  9.  *  Reverse CRC adapted from "Reversing CRC – Theory and Practice"
  10.  *  HU Berlin Public Report
  11.  *  Martin Stigge, Henryk Plotz, Wolf Muller, Jens-Peter Redlich
  12.  *
  13.  */
  14.  
  15.  
  16.     /**
  17.     * Gives 4 bytes so that it afterwards will compute to the given crc
  18.     *
  19.     * This function uses the method of the multiplication with (x^N)^ -1.
  20.     */// calculate crc except for the last 4 bytes ; this is essentially crc32 ()*/
  21.         $crcreg = 0xffffffff ;
  22.  
  23.         // calculate new content bits
  24.         // new_content = tcrcreg * CRCINV mod CRCPOLY
  25. // reduce modulo CRCPOLY
  26. // add CRCINV if corresponding bit of operand is set
  27. // return new content
  28.         $buffer = ""/* Calculates the CRC32 of the given file without loading the file in RAM at once */'rb'""

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