RarEntry::getCrc

(PECL rar >= 0.1)

RarEntry::getCrcGet CRC of the entry

Descrierea

public RarEntry::getCrc ( void ) : string

Returns an hexadecimal string representation of the CRC of the archive entry.

Parametri

Această funcție nu are parametri.

Valorile întoarse

Returns the CRC of the archive entry or FALSE on error.

Istoricul schimbărilor

Versiune Descriere
2.0.0 This method now returns correct values for multiple volume archives.

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aterlux at mail dot ru
1 year ago
RarEntry::getCrc() returs a lowercase hex-string (e.g. 'bf6fa85c') the same as hash_... functions, using the same polynomial as 'crc32b' algorithm.
So, it can be used to check CRC after a stream unpacking:

<?php
  $archive_name
= 'archive.rar';

 
$entry_name = 'someentry.ext';

 
$rar = RarArchive::open($archive_name) or die("Cannot open archive $archive_name");

  if (
$rar->isBroken()) {
    die(
"The archive is broken!");
  }

 
$entry = $rar->getEntry($entry_name) or die("Cannot find entry $entry_name");

 
$stream = $entry->getStream() or die("Cannot open stream");

 
$crc = hash_init('crc32b'); // Initializing the hash function

 
while (!feof($stream)) {
   
$s = fread($stream, 8192);
    if (
$s === false) {
       
// Error reading (do not use fread(...) or die(...), because fread can return '0'!)
     
die('Error reading the compressed file.');
    }
   
hash_update($crc, $s); // updating the hash

    // ...
    // Do whatever with the $s
 
}

 
fclose($stream);

 
$got_crc = hash_final($crc);
 
$need_crc = $entry->getCrc();

  print(
"Got CRC: $got_crc" . PHP_EOL);
  print(
"Need CRC: $need_crc" . PHP_EOL);

  if (
$got_crc != $need_crc) {
   
// rollback
   
print("Sorry guys, the file was incorrect!" . PHP_EOL);
  } else {
    print(
"Everything is ok" . PHP_EOL);
  }
?>
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