Server Side File Split

[zurok]

Is there a way to split large .zip files into smaller files to be downloaded using php or cgi? I know how to do it using Java but my webhost doesn't support that. Thanks.
Z

[irish]

It depends on your hosting environment. You could probably do something with the average shell setup on a linux box, but is that what is available to you? I know customers at my company don't typically get access to all those shell tools, let alone the shell itself.

If you are hosting on a Windows box, then good luck. I am sure there is a way, but I doubt it will be available to a default setup, unless you do all the splitting programatically.

[zurok]

i am on a linux box. i have a lot of users on my site that are on modems and have problems downloading large files. my goal is to take for example a 5 mb zip file and split it up into 5 1mb files (not necissarily zip files) for a user to download. i can create a batch file that will join the files for the user.

the flow should be something like this.

1. read in the file
2. grab a byte
3. create or open file part X
4. write the byte to the opened file
5. close the file
6. go back to number 2 until the end of the file

it seems to me that a lot of sites could use this for there 56k or less modem users.

im going to buckle down and learn php in the next few days so if i find a solution ill post it for anyone else to use. however, if someone already this solution please post the code. thanks.
Z

[zurok]

I was able to figure it out. If anyone is interested here is the code to take a file and split it into equal parts. It also creates a .bat file so that you can then rejoin the parts.

<pre>
<?
$filename = "C:\apache\htdocs\test.zip";

$maxfilesize = 1000000;
$com = "copy /b ";		// Command string for the batch file
$pos = 0; 											//current position of the file pointer
$i   = 1;

if (!($fp = fopen ($filename, "r"))) {
	print "Error - could not open the file $filename";
}
else {
    $filesize = filesize($filename);
    $sizesplit = ceil($filesize / $maxfilesize); //echo $sizesplit;
    $size = $filesize / $sizesplit; //echo $size;
    $pos = $size;
    for(; $i <= $sizesplit; $i++){	

        echo "fp = ";
        echo ftell($fp);
        if($i==$sizesplit){
            $pos += $size;
            $com = "$com $filename.$i";	
        }
        else
            $com = "$com $filename.$i + ";	
        $byte = fread ($fp, $pos); 
        echo "<BR>pos = $pos <BR>i = $i<BR>size = $size<BR>*************<BR>";


	    if (!($fp1 = fopen ("$filename.$i", "w+"))) {
            print "Error - could not open the file $filename.$i";
        }
        else {
            fputs($fp1,$byte);
        	fclose ($fp1);
        }
    }
    fclose ($fp);
    $com = "$com $filename";
    if (!($fp = fopen ("$filename(join).bat", "w+"))) {
        print "Error - could not open the file $batname";
    }
    else {
       fputs($fp,$com);
       fclose ($fp);
    }
}

echo "<br>done";

?>
</pre>