RarEntry::getCrc

(PECL rar >= 0.1)

RarEntry::getCrcGet CRC of the entry

说明

public string RarEntry::getCrc ( void )

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

参数

此函数没有参数。

返回值

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

更新日志

版本 说明
2.0.0 This method now returns correct values for multiple volume archives.

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aterlux at mail dot ru
1 month 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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