(PECL rar >= 0.1)

RarEntry::getCrcGet CRC of the entry


public RarEntry::getCrc(): string

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

Elenco dei parametri

Questa funzione non contiene parametri.

Valori restituiti

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

Log delle modifiche

Versione Descrizione
PECL rar 2.0.0 This method now returns correct values for multiple volume archives.

add a note add a note

User Contributed Notes 1 note

aterlux at mail dot ru
4 years 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:

= 'archive.rar';

$entry_name = 'someentry.ext';

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

  if (
$rar->isBroken()) {
"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


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

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

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