String being truncated while reading a big file

Nobody has claimed this yet.

```
Hello

I'm sorry, I can't attach a file that causes a bug because of some company
policies forbid it.
I found that the bug might be near the the line 1108.

$newstr = '';
for ($j = 0; $j < strlen($retstr); $j++) {
$newstr = $retstr[$j].chr(0);
}
$retstr = $newstr;

I really not an expert in excel's inner file format, but I think that this code
will truncate the string inside the $retstr variable.
I replaced the
$newstr = $retstr[$j].chr(0);
with
$newstr .= $retstr[$j].chr(0);

and now everything works as it should be (at least it looks like that).

Thank you.

Dmitry.
```

Original issue reported on code.google.com by `dklimenk...@gmail.com` on 21 Feb 2012 at 3:27

Start at line 1108 and inspect how the $retstr loop builds the string while reading a large file. Reproduce the report with a large input and confirm that the resulting string is preserved in full rather than truncated.

Written by the indexing model from the issue text.