+++ /dev/null
-<?php
-
-# if someone uploads an image, which is larger than the allowed
-# image size (EWIKI_IMAGE_MAXSIZE), then this plugin tries to
-# rescale that image until it fits; it utilizes the PHP libgd
-# functions to accomplish this
-
-# NOTE: It is currently disabled for Win32, because nobody knows, if
-# this will crash the PHP interpreter on those systems.
-
-# Changed on 6/8/04 by Alfred Sterphone, III
-# Types supported: gif, png, jpeg
-# All that are resized are converted to jpeg in the end
-# WBMP stands for wireless bitmap and not windows bitmap
-# Bitmap support for only 25KB files is folly anyway
-
-# Revamped again, later the same day (6/8/04) by me again
-# Implemented a binary search for the correct pixel width
-# Next step is to put PHPUnit around and test all cases
-
-# Refactoring and bullet-proofing completed (6/15/04) by me again
-
-/*
-Design Requirements
-- Handled formats: jpeg, gif, png
-- Images wider than 90% of our page width will be resized proportionally to 90% of page width at upload
-- Images uploaded as images will be restricted to 25 kilobytes
-- Images larger than this will:
--# Be scaled according to our page width
--# Be converted to JPEG
--# Be re-compressed as JPEG with compression settings that suits us
--# Rescaled via binary search for suitable size down to 20% of page width
--# Rejected as too large
-- Image format may be changed in scaling
-- Images uploaded as attachments will not be scaled in this manner
-
-
-*/
-
-define("EWIKI_IMGRESIZE_WIN", 0);
-define("EWIKI_IMAGE_MAX_PIXELS", 11000000); //11 megapixels
-define("EWIKI_IMAGE_MAXSIZE", 65536);
-define("EWIKI_IMAGE_TOLERANCE", 60000); //don't settle for smaller than this during resize
-define("EWIKI_WORK_AREA", 640); //width of whitespace or work area within ewiki
-define("EWIKI_IMAGE_MAX_X", (int)(.9*EWIKI_WORK_AREA)); //90% max
-define("EWIKI_IMAGE_MIN_X", (int)(.2*EWIKI_WORK_AREA)); //20% min
-define("EWIKI_IMAGE_MAX_Y",1000); //max y value if picture is "candy cane"
-define("EWIKI_IMAGE_RATIO", 10); //maximum acceptable y:x ratio
-
-if (!strstr(PHP_VERSION, "-dev") && !(extension_loaded("php_gd2.dll") or extension_loaded("gd.so")) && !function_exists("imagecreate") && function_exists("dl"))
-{ #-- try to load gd lib
- @dl("php_gd2.dll") or @dl("gd.so");
-}
-
-if (function_exists("imagecreate"))
-{
- $ewiki_plugins["image_resize"][] = "ewiki_binary_resize_image_gd";
-}
-
-function ewiki_binary_resize_image_gd(&$filename, &$mime, $return=0)
-{
- return resizeImage($filename, $mime, $return);
-}
-
-function getTypeFromMIME($mime)
-{
- #-- read orig image
- strtok($mime, "/");
- $type = strtok("/");
- return($type);
-}
-
-function getXY($orig_image,&$orig_x,&$orig_y)
-{
- $orig_x = imagesx($orig_image);
- $orig_y = imagesy($orig_image);
-}
-
-function isResizeNeeded($a_width, $a_fileName)
-{
- clearstatcache();
-
- if ($a_width > EWIKI_IMAGE_MAX_X)
- {
- return true;
- }
-
- if (filesize($a_fileName) > EWIKI_IMAGE_MAXSIZE)
- {
- return true;
- }
-
- return false;
-}
-
-function isImageTolerable($a_fileName)
-{
- clearstatcache();
-
- if (filesize($a_fileName) > EWIKI_IMAGE_MAXSIZE)
- {
- return false;
- }
-
- if (filesize($a_fileName) < EWIKI_IMAGE_TOLERANCE)
- {
- return false;
- }
-
- return true;
-}
-
-function getImageStream($filename,$type)
-{
- $retval=NULL;
-
- if ((($type != "gif") && ($type !="jpeg") && ($type !="png") && ($type != "vnd.wap.wbmp")))
- {
- return($retval);
- }
-
- if (!function_exists($pf = "imagecreatefrom$type"))
- {
- return($retval);
- }
-
- $retval = $pf($filename);
-
- return($retval);
-}
-
-function getInitialResize($orig_image,&$new_x,&$new_y)
-{
- getXY($orig_image,$orig_x,$orig_y);
-
- if ($orig_x <= EWIKI_IMAGE_MAX_X)
- //keep original dimesions
- {
- $new_x=$orig_x;
- $new_y=$orig_y;
- }
- else
- //wider than max width, so resize
- {
- $new_x=EWIKI_IMAGE_MAX_X;
- $new_y=(int)((EWIKI_IMAGE_MAX_X*$orig_y)/$orig_x);
- }
-}
-
-function doResize($orig_image,$new_x,$new_y,&$type)
-{
- $tc = function_exists("imageistruecolor") && imageistruecolor($orig_image);
- if (!$tc || ($type == "gif"))
- {
- $new_image = imagecreate($new_x, $new_y);
- $white = imagecolorallocate($new_image,255,255,255);
- imagefill($new_image, 0, 0, $white);
- imagepalettecopy($new_image, $orig_image);
- }
- else
- {
- $new_image = imagecreatetruecolor($new_x, $new_y);
- $white = imagecolorallocate($new_image,255,255,255);
- imagefill($new_image, 0, 0, $white);
- }
-
- getXY($orig_image,$orig_x,$orig_y);
-
- #-- resize action
- imagecopyresampled($new_image, $orig_image, 0,0, 0,0, $new_x,$new_y, $orig_x,$orig_y);
-
- $type = "jpeg";
-
- return($new_image);
-}
-
-function doSave(&$image,$filename,$type)
-{
- if (function_exists($pf = "image$type"))
- {
- $pf($image,$filename,70);
- }
- else
- {
- return(false); # cannot save in orig format
- }
-}
-
-function isCandyCane($filename)
-{
- clearstatcache();
-
- list($width, $height, $type, $attr) = getimagesize($filename);
- $ratio = ($height/$width);
- $fs = filesize($filename);
-
- if (($ratio > EWIKI_IMAGE_RATIO) && ($fs > EWIKI_IMAGE_MAXSIZE) && ($height > EWIKI_IMAGE_MAX_Y))
- {
- ewiki_log("$filename is a candy cane",3);
- return true;
- }
- return false;
-}
-
-function isMemoryFriendly($filename)
-{
- list($width, $height, $type, $attr) = getimagesize($filename);
- $pixels = (int)($height*$width);
-
- if ($pixels > EWIKI_IMAGE_MAX_PIXELS)
- {
- ewiki_log("$filename at $pixels pixels is too big!",3);
- return false;
- }
-
- return true;
-}
-
-function resizeImage(&$filename, &$mime, $return=0)
-{
- //start timing
- $time_start = getmicrotime();
-
- /*** this disallows Win32 ***/
- if ((DIRECTORY_SEPARATOR!="/") && !EWIKI_IMAGERESIZE_WIN || (strpos($mime, "image/")!==0))
- {
- return(false);
- }
-
- if (!isMemoryFriendly($filename))
- {
- return false;
- }
-
- if (isCandyCane($filename))
- {
- return false;
- }
-
- $rescaled_filename = $filename;
-
- $type = getTypeFromMIME($mime);
-
- $orig_image = getImageStream($rescaled_filename,$type);
- if (!isset($orig_image))
- {
- return(false);
- }
-
- getXY($orig_image,$orig_x,$orig_y);
-
- if (!isResizeNeeded($orig_x, $filename))
- return true;
-
- getInitialResize($orig_image,$new_x,$new_y);
-
- $orig_image = doResize($orig_image,$new_x,$new_y,$type);
-
- $rescaled_filename = tempnam(EWIKI_TMP, "ewiki.img_resize_gd.tmp.");
- doSave($orig_image,$rescaled_filename,$type);
-
- if (isResizeNeeded($new_x, $rescaled_filename))
- //will only take cases that need to be resized
- {
- ewiki_log("Resize beyond initial resize is needed. Carrying through.",3);
-
- //set starting points for binary search
- $x_max=EWIKI_IMAGE_MAX_X-1;
- $x_min=EWIKI_IMAGE_MIN_X;
-
- //set failsafe break to max number of iterations through the loop
- $failsafe = (int)(log($orig_x)+1);
-
- while (($x_min <= $x_max) && !isImageTolerable($rescaled_filename))
- //the resize while loop
- {
- ewiki_log("While loop initiated",3);
-
- //somehow made it to an infinite loop, so get out
- if($failsafe < 0) return(false);
-
- //take a guess at the correct width
- $x_guess=(int)(($x_max+$x_min)/2);
-
- if ($filename == $rescaled_filename)
- {
- $rescaled_filename = tempnam(EWIKI_TMP, "ewiki.img_resize_gd.tmp.");
- }
-
- #-- sizes
- $new_x = (int)($x_guess);
- $new_y = (int)(($x_guess*$orig_y)/$orig_x);
-
- $new_image = doResize($orig_image,$new_x,$new_y,$type);
-
- doSave($new_image,$rescaled_filename,$type);
-
- #-- prepare next run
- imagedestroy($new_image);
- clearstatcache();
-
- $failsafe--;
-
- $ftmp = filesize($rescaled_filename);
- ewiki_log("xguess: $x_guess, xmin: $x_min, xmax: $x_max, filesize: $ftmp",3);
-
- if (filesize($rescaled_filename) < EWIKI_IMAGE_TOLERANCE)
- {
- $x_min=$x_guess+1;
- }
- else if (filesize($rescaled_filename) > EWIKI_IMAGE_MAXSIZE)
- {
- $x_max=$x_guess-1;
- }
- }
-
- ewiki_log("While loop ended",3);
-
- }
-
- #-- stop
- imagedestroy($orig_image);
- clearstatcache();
-
- #-- security check filesizes, abort
- if (!filesize($filename) || !filesize($rescaled_filename) || (filesize($rescaled_filename) > EWIKI_IMAGE_MAXSIZE))
- {
- unlink($rescaled_filename);
- return($false);
- }
-
- #-- set $mime, as it may have changed (.gif)
- $mime = strtok($mime, "/") . "/" . $type;
- if (!strstr($filename, ".$type"))
- {
- unlink($filename);
- $filename .= ".$type";
- }
-
- #-- move tmp file to old name
- copy($rescaled_filename, $filename);
- unlink($rescaled_filename);
-
- //end timing
- $time_end = getmicrotime();
- $time = $time_end - $time_start;
- ewiki_log("$time seconds to perform resizing", 3);
-
- return(true);
-}
-?>
\ No newline at end of file
projects / atutor.git / blobdiff