Doc #81345 [Com]: ftell() after writing to compress://zlib stream wrong
Edit report at https://bugs.php.net/bug.php?id=81345&edit=1
ID: 81345
Comment by: farid dot jamili4118 at gmail dot com
Reported by: cmb@php.net
Summary: ftell() after writing to compress://zlib stream
wrong
Status: Open
Type: Documentation Problem
Package: Streams related
Operating System: *
PHP Version: 7.4Git-2021-08-10 (Git)
Block user comment: N
Private report: N
New Comment:
Thanks for the info I will try to figure it out for more.
(https://www.mymilestonecard.top/)php.net
Previous Comments:
------------------------------------------------------------------------
[2021-08-10 13:11:03] cmb@php.net
Description:
------------
After writing to a compress://zlib stream, ftell() reports the
number of uncompressed bytes which have been written, not the
actual stream position. This is inherently tied to the way the
streams layer works: the stream's write method is supposed to
return the number of input bytes processed, so the same confusing
behavior happens for all streams for which the number of input
bytes is not the same as the number of output bytes.
Since this cannot easily be fixed, it should at least be
documented.
Test script:
---------------
<?php
$s = fopen("compress.zlib://file.gz", "w");
var_dump(fwrite($s, str_repeat("hello world", 100)));
fflush($s); // this doesn't make a difference
var_dump(ftell($s));
fclose($s);
var_dump(filesize("file.gz"));
?>
Expected result:
----------------
int(1100)
int(38)
int(48)
Actual result:
--------------
int(1100)
int(1100)
int(48)
------------------------------------------------------------------------
--
Edit this bug report at https://bugs.php.net/bug.php?id=81345&edit=1
Thread (4 messages)