File Transfer/GZip

[mtylerb]

Hey guys (and gals),

 

I'm trying to call files from one of my servers to another.  They are all image files and I'm mostly doing this as a learning experiment.  Right now I have it so that it is reading the contents of the files, but the .gz file it creates only has one file and the image in it is about the first 10 pixels deep, and then nothing.  So, assuming $contents is the fread of the file and $imagesize is just that, how would I put multiple files into a .gz compressed archive?

 

I'm currently trying:

 

		$archive = gzopen($_SERVER['DOCUMENT_ROOT'].'/grab/files/'.$this->year.'-'.$this->month.'-'.$this->day.'.gz','wb9');
	foreach($this->images as $url)
	{
		$parsed = parse_url($url);
		$host = $parsed["host"];
		$fp = @fsockopen($host, 80, $errno, $errstr, 20);
		if(!$fp)return false;
		else {
			@fputs($fp, "HEAD $url HTTP/1.1\r\n");
			@fputs($fp, "HOST: $host\r\n");
			@fputs($fp, "Connection: close\r\n\r\n");
			$headers = "";
			while(!@feof($fp))$headers .= @fgets ($fp, 128);
		}
		@fclose ($fp);
		$return = false;
		$arr_headers = explode("\n", $headers);
		foreach($arr_headers as $header) {
			$s = "Content-Length: ";
			if(substr(strtolower ($header), 0, strlen($s)) == strtolower($s)) {
				$return = trim(substr($header, strlen($s)));
				break;
			}
		}
		$imgsize = $return;
		$fp = fopen($url,'r');
		$contents = fread($fp, $imgsize);
		echo $imgsize."\r\n";
		gzwrite($archive,$contents);
	}
	gzclose($archive);

 

with no success.  Any ideas?  Thanks in advance!

 

EDIT: That echo near the end is just for debugging.

[mtylerb]

Ok, I've changed it up a bit and, instead, copied the files to the local server.  Now how would I go about placing those files into a gz archive?

[mtylerb]

The current code looks like:

 

	function createArchive()
{
	$archive = gzopen($_SERVER['DOCUMENT_ROOT'].'/grab/files/'.$this->year.'-'.$this->month.'-'.$this->day.'.gz','wb9');
	$x=0;
	foreach($this->images as $url)
	{
		$x++;
		$parsed = parse_url($url);
		$host = $parsed["host"];
		$fp = @fsockopen($host, 80, $errno, $errstr, 20);
		if(!$fp)return false;
		else {
			@fputs($fp, "HEAD $url HTTP/1.1\r\n");
			@fputs($fp, "HOST: $host\r\n");
			@fputs($fp, "Connection: close\r\n\r\n");
			$headers = "";
			while(!@feof($fp))$headers .= @fgets ($fp, 128);
		}
		@fclose ($fp);
		$return = false;
		$arr_headers = explode("\n", $headers);
		foreach($arr_headers as $header) {
			$s = "Content-Length: ";
			if(substr(strtolower ($header), 0, strlen($s)) == strtolower($s)) {
				$return = trim(substr($header, strlen($s)));
				break;
			}
		}
		$imgsize = $return;
		$fp = explode('/',$url);
		copy($url, $_SERVER['DOCUMENT_ROOT'].'/grab/files/'.$fp[count($fp)-1]);
		//unlink($_SERVER['DOCUMENT_ROOT'].'/grab/files/'.$fp[count($fp)-1]);
	}
	gzclose($archive);
	//unlink($_SERVER['DOCUMENT_ROOT'].'/grab/files/'.$this->year.'-'.$this->month.'-'.$this->day.'.gz');
}

 

Probably should have posted that before.  The unlinks are just there so I can uncomment them and delete the relevant files.  Is anyone able to help?

[mtylerb]

Anyone?  I suppose I could deal with a .zip file, if someone's able to help out, but I'd still prefer a .gz file.

[corbin]

gzip isn't usually used for multiple files, due to the way it compresses (or deflates as they call it).

 

You could make a tar ball though, which is a tar file (an archive) compressed by gzip.

[mtylerb]

Thanks corbin!  I haven't found any information on php.net regarding the creation of tarballs.  Is it only available through PEAR?  Is there a good site for information on using this?

[corbin]

http://php.net/manual/en/refs.compression.php

 

 

You can probably find something other than tar/gzip to use.

 

 

But, if you can't, you could use one of the many PHP/Tar classes out there.  Googling "PHP tar" came up with a bunch.

 

I may have misread what you were trying to do earlier, actually.  Gzip could suit your cause.  What exactly are you trying to do?

[mtylerb]

I want to take a list of image files that I have transferred to a local server and compress them into one file.  So:

 

image1.jpg

image2.jpg

image3.jpg

image4.jpg

 

into

 

images.gz or images.tar.gz

 

Whatever is easier.