Re: [PHP] Optimize simple file XOR code
Hi Marcus
Try this:
function CryptFile($hash, $filename)
{
// The key used is generated using another function.
// Since this function is only called once it has
// nothing to do with the performance of this function
$key = GenerateKey($hash);
$keylen = strlen($key = implode('', $key));
$handle = fopen($filename, 'r');
while (!feof($handle))
{
// Set the time limit or the script will time out
// on large files
set_time_limit(30);
$data = fread($handle, 8192);
for ($i = 0; $i strlen($data); $i = $i + $keylen)
{
$data = substr_replace($data, substr($data, $i, $keylen) ^ $key, $i, $keylen);
}
// Return the encrypted version to the browser
echo $data;
}
}
It should return the same results, but at my machine it is about 30
percent faster.
Cheers
Marcel
Hi!
I'm using a very simple algorithm to encrypt files sent from the server
On Demand. The algorithm uses XOR for the encryption. My problem is
that the code is very slow, it can only process about 40 KB per second
on my system, so my question is, is there any more speed optimized way
to write this code?
Here is my function:
function CryptFile($hash, $filename)
{
// The current position in the key generated below
$key_pos = 0;
// The key used is generated using another function.
// Since this function is only called once it has
// nothing to do with the performance of this function
$key = GenerateKey($hash);
$handle=fopen($filename, r);
while (!feof($handle))
{
// Set the time limit or the script will time out
// on large files
set_time_limit(30);
$data = fread($handle,8192);
for ($i=0; $istrlen($data); $i++)
{
// Change the data read from the file by using
// XOR with the key
$data[$i] = $data[$i] ^ $key[$key_pos];
// Calculate the next position in the key
$key_pos=($key_pos+1) % count($key);
}
// Return the encrypted version to the browser
echo $data;
}
}
My guess is that if one should start optimizing the code anywhere, it
would be within the for-loop. Any ideas?
Thanks in advance!
Regards,
Marcus
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[PHP] DSOFile issues
Hi everybody,
I need to get the Office Document Properties from MSWord-files and i
found DSOFile for COM:
http://support.microsoft.com/support/kb/articles/Q224/3/51.asp
But now the problem is, that the COM Object don't releases the file
lock. Here is the code I use:
?php
$propReader = new COM('DSOleFile.PropertyReader');
$info = pathinfo(__FILE__);
$docProps = $propReader-getDocumentProperties($info['dirname'] . '/Dok0.doc');
$custProps = $docProps-customProperties;
while($elem = $custProps-next()) {
echo $elem-Name . ': ' . $elem-Value . 'br';
}
unset($custProps);
unset($docProps);
unset($propReader);
?
I don't find anything online about that problem... Does anyone have
experience with DSOFile?
Thanks in advance,
Marcel Tschopp
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[PHP] Re: Re: Auth_User
Eventually the apache module mod_ntlm (http://modntlm.sourceforge.net/) could help... don't know if it really works but it looks very interesting. cheers Marcel If you are using IIS with PHP as an ISAPI-module, it is possible to find out the NT-User through $_SERVER['AUTH_USER']. Apparently it is not so easy on Apache. Does anyone know a solution? Gabor Gerben [EMAIL PROTECTED] schrieb im Newsbeitrag news:[EMAIL PROTECTED] This var means something else when you write the following code: Header(WWW-Authenticate: Basic realm=\Enter username and password\); Header(HTTP/1.0 401 Unauthorized); Your browser will produce a popup requesting a username an password This it what you get returned when using $_SERVER['AUTH_USER'] Gabor NiederläNder [EMAIL PROTECTED] wrote in message news:[EMAIL PROTECTED] Hi! I have installed a Apache Server (+php) in a Windows NT network. I would like to identify the Windows NT user visiting my php pages. When I was using IIS, I think it was quite easy to find it out through the $_SERVER['AUTH_USER'] variable. But it doesn't seem to work with apache. Is there another way? Cheers, Gabor -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP] Programming User-Customized Categories ??
Hey Why don't you make a second table 'categories' and have the two tables in relation? For example: Table 'contacts': id name category_id -- 0 John Doe3(Category New York Office) 1 Jane Smith 4(Category Orlando Office) 2 Mark Jones 2(Category Creative) Table 'categories': id nameparent_id -- 1 Sales 0(Main category) 2 Creative0(Main category) 3 New York Office 1(Subcategory of Sales) 4 Orlando Office 1(Subcategory of Sales) So you have unlimited subcategories and the users can choose and add them easily. In addition, you have normalized your data... cheers Marcel On Fri, 18 Jun 2004 16:29:14 -0400 Monty wrote: Hi, I need to add the ability for users to define and set up their own categories and sub-categories that can be used to group contacts they enter into a database. Here's an example of how the data might be stored... NameMain Category Sub Category - - John DoeSales New York Office Jane Smith Sales Orlando Office Mark Jones Creative Sarah Williams Creative Kevin Brown Manager Office Manager Joe Johnson Manager Site Manager I need to allow users to define the types of Main Categories they want, and to also define whether or not those Main Categories will have Sub Categories, which they can also define. I know how to do this if the types of categories and sub-categories were pre-defined, but, I'm finding it a lot trickier to allow the users to customize these with their own category types. So, I'm hoping someone might be able to point me to an example of how custom categories and sub-categories can be programmed in PHP and set up in MySQL. Any suggestions or advice would be much appreciated! Monty -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php -- Marcel Tschopp [EMAIL PROTECTED] -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
