Create zip files - archive only, do not compress

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September 9th, 2010, 02:51 AM

srisa

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PHP5 - Create zip files - archive only, do not compress

Hello,

I have to send a collection of some files (number can range from 20-100) to users. PHP has the zip file functions for the purpose; well and good.

Problem is, most of those files will be jpeg's (which is a compressed format). As i see it, it doesn't make sense in compressing a compressed file which results in no-compression or negligible-compression; it is a waste of time and resources.

So, is there any way to disable the compression part? Just create the archive by grouping all the files but do not compress.

Thank you.

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September 9th, 2010, 03:13 AM

PradeepKr

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explore apache settings

Code:

<IfModule mod_deflate.c>
    SetOutputFilter DEFLATE
    # file-types indicated will not be compressed
    SetEnvIfNoCase Request_URI \.(?:gif|jpe?g|png|rar|zip|pdf)$ no-gzip dont-vary
    <IfModule mod_headers.c>
        Header append Vary User-Agent
    </IfModule>
</IfModule>

September 9th, 2010, 04:15 AM

srisa

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Quote:

Originally Posted by PradeepKr

explore apache settings

Code:

<IfModule mod_deflate.c>
    SetOutputFilter DEFLATE
    # file-types indicated will not be compressed
    SetEnvIfNoCase Request_URI \.(?:gif|jpe?g|png|rar|zip|pdf)$ no-gzip dont-vary
    <IfModule mod_headers.c>
        Header append Vary User-Agent
    </IfModule>
</IfModule>

That, i assume will be helpful when i am delivering the zip files. I want to disable compression while "creating" the files using the ZipArchive() class of php.

September 10th, 2010, 07:40 AM

srisa

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There is a constant, ZIPARCHIVE::CM_STORE. It is read only as of now; useful for determining the compression method of an existing zip file. It is not possible to use it while creating a zip file.

Here is the source link, http://bugs.php.net/bug.php?id=41243

February 14th, 2013, 06:46 AM

VictoriaDarlene

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I use B1 archiver for that. Just when choosing compression mode I opt for "Store" mode. In that case files do not get actually compressed but only stored together.

February 14th, 2013, 10:37 AM

kicken

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Use an external CLI tool to generate the zip file, such 7zip or zip. You can build up a command line and then use exec() to run it.

Code:

//generate an array of files to compress, $files
$files = array_map('escapeshellarg', $files);
$output = tempnam(); //get temporary file name
$cmd = 'zip -0 '.escapeshellarg($output).' '.implode(' ', $files);
exec($cmd, $output, $ret);
if ($ret==0){
   //success
   //do whatever you need with $output
   unlink($output); //cleanup

}
else {
  //fail
   unlink($output); //cleanup
}

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