Bug #52801 [Com]: getimageblob() on Imagick object from tiff file produces random md5 hashes

From: Date: Wed, 08 Sep 2010 23:24:41 +0000
Subject: Bug #52801 [Com]: getimageblob() on Imagick object from tiff file produces random md5 hashes
References: 1  Groups: php.bugs 
Request: Send a blank email to php-bugs+get-154198@lists.php.net to get a copy of this message 
Edit report at http://bugs.php.net/bug.php?id=52801&edit=1

 ID:                 52801
 Comment by:         matvey at copters dot ru
 Reported by:        matvey at copters dot ru
 Summary:            getimageblob() on Imagick object from tiff file
                     produces random md5 hashes
 Status:             Bogus
 Type:               Bug
 Package:            *Graphics related
 Operating System:   Linux Debian Lenny 64
 PHP Version:        5.2SVN-2010-09-08 (SVN)
 Block user comment: N

 New Comment:

rgp@cp ~/src $ cat f.php 
<?php
$s = array(
  1,
  2,
  3,
  4,
  5,
  6,
  7,
  8,
  9,
  10,
);

foreach ($s as $t) {
  $hash = hash_file('md5', "test.tif");
  echo "{$hash} \n";
}
?>
rgp@cp ~/src $ php -f f.php 
be42c81505f2c9ef70994c60915a3f12 
be42c81505f2c9ef70994c60915a3f12 
be42c81505f2c9ef70994c60915a3f12 
be42c81505f2c9ef70994c60915a3f12 
be42c81505f2c9ef70994c60915a3f12 
be42c81505f2c9ef70994c60915a3f12 
be42c81505f2c9ef70994c60915a3f12 
be42c81505f2c9ef70994c60915a3f12 
be42c81505f2c9ef70994c60915a3f12 
be42c81505f2c9ef70994c60915a3f12


Previous Comments:
------------------------------------------------------------------------
[2010-09-09 01:22:18] matvey at copters dot ru

Ok, but why on earth the same file.tiff hash_file('md5', 'file.tiff');
produces 
constant values?

Thanx for the tip.

------------------------------------------------------------------------
[2010-09-09 01:00:55] pajoye@php.net

Report bugs about pecl's package to pecl please.

Tip: float are not an exact science and tiff can use floats.

------------------------------------------------------------------------
[2010-09-09 00:31:58] matvey at copters dot ru

rgp@cp ~/src $ cat s.php
<?php
$s = array(
  1,
  2,
  3,
  4,
  5,
  6,
  7,
  8,
  9,
  10,
);

foreach ($s as $t) {
  $ob = new Imagick("test.tif");
  $hash = hash('md5', $ob->getimageblob());
  echo "{$hash} \n";
}
?>
rgp@cp ~/src $ php -f s.php 
3a0eff2dc635064f91f9720e4f02fc25 
0e15adc163724345c26305df4cb2faed 
0e15adc163724345c26305df4cb2faed 
a6577644313c4fbd5014028c16a78e84 
dd391a6977cc7a6af56037959d607c90 
dd391a6977cc7a6af56037959d607c90 
83caff49e5d8abe704cf8c298770314f 
e85136bd4259b4b18e8f0bbc9867da9b 
36bdf4fc1806f83040b71a7214cc1d4c 
491f7bc84db9b83602f9d5ebc13f530a

------------------------------------------------------------------------
[2010-09-09 00:20:31] matvey at copters dot ru

Description:
------------
$this->insecure     = new Imagick("file.tiff");
$this->originalhash = hash('md5', $this->insecure->getimageblob());
$this->originalhash is always different, but file.tiff is always the
same.

Test script:
---------------
$ob   = new Imagick("file.tiff");
$hash = hash('md5', $ob->getimageblob());



------------------------------------------------------------------------



-- 
Edit this bug report at http://bugs.php.net/bug.php?id=52801&edit=1

Thread (5 messages)

« previous php.bugs (#154198) next »