mchurch
122 lines
3.2 KiB
PHP
Executable File
122 lines
3.2 KiB
PHP
Executable File
<?php
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# if someone uploads an image, which is larger than the allowed
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# image size (EWIKI_IMAGE_MAXSIZE), then this plugin tries to
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# rescale that image until it fits; it utilizes the PHP libgd
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# functions to accomplish this
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# NOTE: It is currently disabled for Win32, because nobody knows, if
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# this will crash the PHP interpreter on those systems.
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define("EWIKI_IMGRESIZE_WIN", 0);
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if (!strstr(PHP_VERSION, "-dev") && !function_exists("imagecreate") && function_exists("dl")) { #-- try to load gd lib
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@dl("php_gd2.dll") or @dl("gd.so");
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}
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if (function_exists("imagecreate")) {
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$ewiki_plugins["image_resize"][] = "ewiki_binary_resize_image_gd";
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}
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function ewiki_binary_resize_image_gd(&$filename, &$mime, $return=0) {
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/*** this disallows Win32 ***/
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if ( (DIRECTORY_SEPARATOR!="/") && !EWIKI_IMAGERESIZE_WIN
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|| (strpos($mime, "image/")!==0) )
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{
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return(false);
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}
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$tmp_rescale = $filename;
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#-- initial rescale
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$r = EWIKI_IMAGE_MAXSIZE / filesize($tmp_rescale);
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$r = ($r) + ($r - 1) * ($r - 1);
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#-- read orig image
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strtok($mime, "/");
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$type = strtok("/");
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if (function_exists($pf = "imagecreatefrom$type")) {
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$orig_image = $pf($filename);
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}
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else {
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return(false);
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}
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$orig_x = imagesx($orig_image);
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$orig_y = imagesy($orig_image);
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#-- change mime from .gif to .png
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if (($type == "gif") && (false || function_exists("imagepng") && !function_exists("imagegif"))) {
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$type = "png";
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}
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#-- retry resizing
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$loop = 20;
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while (($loop--) && (filesize($tmp_rescale) > EWIKI_IMAGE_MAXSIZE)) {
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if ($filename == $tmp_rescale) {
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$tmp_rescale = tempnam(EWIKI_TMP, "ewiki.img_resize_gd.tmp.");
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}
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#-- sizes
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$new_x = (int) ($orig_x * $r);
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$new_y = (int) ($orig_y * $r);
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#-- new gd image
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$tc = function_exists("imageistruecolor") && imageistruecolor($orig_image);
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if (!$tc || ($type == "gif")) {
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$new_image = imagecreate($new_x, $new_y);
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imagepalettecopy($new_image, $orig_image);
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}
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else {
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$new_image = imagecreatetruecolor($new_x, $new_y);
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}
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#-- resize action
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imagecopyresized($new_image, $orig_image, 0,0, 0,0, $new_x,$new_y, $orig_x,$orig_y);
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#-- special things
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if ( ($type == "png") && function_exists("imagesavealpha") ) {
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imagesavealpha($new_image, 1);
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}
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#-- save
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if (function_exists($pf = "image$type")) {
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$pf($new_image, $tmp_rescale);
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}
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else {
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return(false); # cannot save in orig format (.gif)
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}
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#-- prepare next run
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imagedestroy($new_image);
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clearstatcache();
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$r *= 0.95;
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}
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#-- stop
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imagedestroy($orig_image);
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#-- security check filesizes, abort
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if (!filesize($filename) || !filesize($tmp_rescale) || (filesize($tmp_rescale) > EWIKI_IMAGE_MAXSIZE)) {
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unlink($tmp_rescale);
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return($false);
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}
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#-- set $mime, as it may have changed (.gif)
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$mime = strtok($mime, "/") . "/" . $type;
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if (!strstr($filename, ".$type")) {
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unlink($filename);
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$filename .= ".$type";
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}
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#-- move tmp file to old name
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copy($tmp_rescale, $filename);
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unlink($tmp_rescale);
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return(true);
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}
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?>
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