Help needed with cropping 'on the fly' - code is here!

[theCro]

Hello. Some of you fellows already helped me with cropping method .. i use it and it really rocks. However, when cropping it creates NEW file.. i'd like to avoid this as i get into malicious problem when people discover the image patch they easily change width and height and image gets corrupted by their malicious offsets...

 

the code i use is this one:

 

<?PHP

//CURRENT IMG NAME; DESIRED IMG NAME (OPTIONAL); RESIZE WIDTH (OPTIONAL); RESIZE HEIGHT (OPTIONAL); DESIRED IMG FORMAT (jpg, png, etc.; OPTIONAL); CROP (yes; OPTIONAL)
//IF CROPPING IS NOT SET TO yes, WILL RESIZE PROPORTIONALLY TO FIT USING THE WIDTH AND HEIGHT AS MAXIMUMS (IF PROVIDED)
//DESIRED IMG NAME WILL OVERRIDE THE DESIRED IMG FORMAT e.g., original.jpg > new.jpg with format set to png WILL CREATE A JPG FILE CALLED new.jpg

function convert_img ($img_start, $img_end, $width, $height, $format, $crop) {

//FULL SERVER PATH TO THIS FILE -- REPLACE WITH YOUR INFO (ENTIRE PATH MAY DIFFER)
$server_path = "/home/zadarsp/public_html/";

//PATH TO IMAGES DIRECTORY
$img_path = "foto/";

//CHECK IF ORIGINAL FILE EXISTS
if (is_file($server_path.$img_path.$img_start)) {

	//CHECK IF DESIRED IMG NAME IS SPECIFIED
	if (!$img_end){

		//OTHERWISE CHECK IF FORMAT IS SPECIFIED - FORMAT WILL ONLY CHANGE IF IMG_END IS NOT SPECIFIED
		if ($format){
			$img_arr = explode(".", $img_start);
			$img_end = $img_arr[0].".".$format;
		} else {
			$img_end = $img_start;
		}

	}

	//CHECK IF RESIZE WIDTH & RESIZE HEIGHT WERE PROVIDED; ADJUST ACCORDINGLY
	if (!$width && !$height){
		$geometry = "";
	} else {
		if (!$height) {
			$geometry = "-geometry ".$width;
		} else if (!$width) {
			$geometry = "-geometry X".$height;	
		} else {
			$geometry = "-geometry ".$width."X".$height;
		}
	}

	//CHECK IF CROPPING IS REQUESTED - REQUIRES HEIGHT AND WIDTH TO BE SPECIFIED
	if ($crop == "yes"){
		if (!$width || !$height){
			return $error = "ERROR: Specify a width and height or set crop to 'no'";
		}

		$img_size = getimagesize($img_path.$img_start);

		//CALCULATES ASPECT RATIO TO DETERMINE HOW TO RESIZE THE IMAGE PROPORTIONALLY TO MINIMIZE CROPPING
		if(($img_size[0]/$img_size[1]) >= ($width/$height)) {
			$geometry = "-geometry X".$height;
		} else {
			$geometry = "-geometry ".$width;
		}

		//CURRENTLY CROPS FROM THE CENTER OF THE IMAGE -- TRIMMING EQUAL AMOUNTS (ONLY IF NECESSARY) ON THE TOP/BOTTOM; LEFT/RIGHT
		//CROPPING OPTIONS FOR THE GRAVITY INCLUDE: NorthWest, North, NorthEast, West, Center, East, SouthWest, South, SouthEast (CHANGE IF NECESSARY)
		$img_crop = "-gravity Center -crop ".$width."X".$height."+0+0";
	} else {
		$img_crop = "";
	}

	//CONVERT THE IMAGE
	//PATH TO IMAGEMAGICK: /usr/X11R6/bin/convert (MAY BE DIFFERENT ON YOUR SERVER - REPLACE IF NECESSARY)
	$tmpMakeIMG = "/usr/bin/convert -density 300X300 -quality 85 $geometry $img_crop -colorspace RGB $server_path$img_path$img_start $server_path$img_path$img_end";
	$makeIMG = `$tmpMakeIMG`;

	//DISPLAY THE IMAGE OR RETURN ERROR MESSAGE; USE FOR TESTING; DELETE THIS CODE IF NOT REQUIRED
	if (is_file($server_path.$img_path.$img_end)) {

		$img_size = getimagesize($img_path.$img_end);

		return $img = '<IMG SRC="'.$img_path.$img_end.'" border="0" '.$img_size[3].'>';
	} else {
		return $error = "ERROR: There was a problem converting the image!";
	}


} else {
	return $error = "Greska: $img_start ne moze biti pronadjen! Provjeri server_path i img_path varijable.";
}

}


//EXAMPLE USAGE -- ONLY UN-COMMENT THE ONE YOU WANT TO USE:

//OUTPUTS A FILE THAT IS PROPORTIONALLY RESIZED AND CROPPED TO 200px by 200px CALLED new.jpg
//print convert_img ("original.jpg", "new.jpg", "200", "200", "", "yes");

//OUTPUTS A FILE THAT IS PROPORTIONALLY RESIZED TO EITHER 200px by X -OR- X by 200px (DEPENDING ON THE ASPECT RATIO) CALLED new.jpg
//print convert_img ("original.jpg", "new.jpg", "200", "200", "", "");

//OUTPUTS A FILE THAT IS PROPORTIONALLY RESIZED TO 200px by X CALLED original.png
//print convert_img ("original.jpg", "", "200", "", "png", "");

//OUTPUTS A FILE THAT IS PROPORTIONALLY RESIZED TO 200px by X CALLED original.png (alternate way of accomplishing the above)
//print convert_img ("original.jpg", "original.png", "200", "", "", "");

//OVERWRITES THE ORIGINAL FILE AND RESIZES TO X by 200px
//print convert_img ("original.jpg", "", "", "200", "", "");

print convert_img ($_GET['img_start'], $_GET['img_end'], $_GET['w'], $_GET['h'], "", $_GET['crop']);
?>

 

can someone modify it so it's possible to catch image 'on the fly' without changing the original image and creating new one? thanks alot!

[theCro]

anyone?  :'(