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Bug #75887 mime type detection problem
Submitted: 2018-01-29 21:21 UTC Modified: 2018-01-30 16:18 UTC
From: tunderzone at gmail dot com Assigned:
Status: Not a bug Package: Filesystem function related
PHP Version: 7.1.13 OS:
Private report: No CVE-ID: None
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 [2018-01-29 21:21 UTC] tunderzone at gmail dot com 
Description:
------------
having ".text" as first characters on any line of a css file will result in mime being resolved as text/x-asm.

Test script:
---------------
<?php
$info = finfo_open(FILEINFO_MIME_TYPE);
$tipe = finfo_buffer($info, '.text {color: #CCCCCC;}');
var_dump($tipe);
finfo_close($info);

Expected result:
----------------
text/css
or
text/plain


Actual result:
--------------
text/x-asm

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 [2018-01-29 23:29 UTC] requinix@php.net
-Status: Open +Status: Not a bug
 [2018-01-29 23:29 UTC] requinix@php.net 
MIME detection works by examining the first few bytes of a file (or input stream). It is not perfect.
 [2018-01-30 11:37 UTC] tunderzone at gmail dot com 
the text that cause this is not on first line nor last. it is somewhere in the middle of the file. the file size is 14K.
running finfo_open and finfo_file on that file in php 5.5.38 yields text/plain but in php7.1.13 yields text/x-asm
something has changed from php 5 to php 7. this is why i posted this bug.
 [2018-01-30 16:18 UTC] requinix@php.net 
PHP's bundled information comes from the libmagic library, which has a rule that says to scan lines for ".text" and mark the content as text/x-asm if found.
  https://github.com/file/file/blob/master/magic/Magdir/assembler

So the bundled magic database isn't working for you. Try with your system's - probably /usr/share/misc/magic.
  $info = finfo_open(FILEINFO_MIME_TYPE, "/usr/share/misc/magic");
 
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