fixes for exec and imagemagick

conlite/includes/functions.api.images.php

@@ -516,12 +516,14 @@ function capiImgScaleImageMagick($img, $maxX, $maxY, $crop = false, $expand = fa
     }
 
     /* Try to execute convert */
-    $output = array();
-    $retVal = 0;
-    if ($crop) {
-        exec("convert -gravity center -quality " . $quality . " -crop {$maxX}x{$maxY}+1+1 \"$filename\" $cacheFile", $output, $retVal);
-    } else {
-        exec("convert -quality " . $quality . " -geometry {$targetX}x{$targetY} \"$filename\" $cacheFile", $output, $retVal);
+    if (function_exists("exec")) {
+        $output = array();
+        $retVal = 0;
+        if ($crop) {
+            exec("convert -gravity center -quality " . $quality . " -crop {$maxX}x{$maxY}+1+1 \"$filename\" $cacheFile", $output, $retVal);
+        } else {
+            exec("convert -quality " . $quality . " -geometry {$targetX}x{$targetY} \"$filename\" $cacheFile", $output, $retVal);
+        }
     }
 
     if (!file_exists($cacheFile)) {
@@ -539,6 +541,25 @@ function capiImgScaleImageMagick($img, $maxX, $maxY, $crop = false, $expand = fa
  * @return boolean true (gif is animated)/ false (single frame gif)
  */
 function isAnimGif($sFile) {
+     if(!($fh = @fopen($sFile, 'rb')))
+        return false;
+    $count = 0;
+    //an animated gif contains multiple "frames", with each frame having a
+    //header made up of:
+    // * a static 4-byte sequence (\x00\x21\xF9\x04)
+    // * 4 variable bytes
+    // * a static 2-byte sequence (\x00\x2C)
+
+    // We read through the file til we reach the end of the file, or we've found
+    // at least 2 frame headers
+    while(!feof($fh) && $count < 2) {
+        $chunk = fread($fh, 1024 * 100); //read 100kb at a time
+        $count += preg_match_all('#\x00\x21\xF9\x04.{4}\x00\x2C#s', $chunk, $matches);
+    }
+    fclose($fh);
+    return $count > 1;
+    
+    /*
     $output = array();
     $retval = 0;
 
@@ -549,6 +570,8 @@ function isAnimGif($sFile) {
     }
 
     return true;
+     * 
+     */
 }
 
 /**

conlite/includes/functions.general.php

@@ -1428,23 +1428,9 @@ function isImageMagickAvailable() {
             return false;
         }
     }
-
-    $output = array();
-    $retval = 0;
-
-    @exec("convert", $output, $retval);
-
-    if (!is_array($output) || count($output) == 0) {
-        return false;
-    }
-
-    if (strpos($output[0], "ImageMagick") !== false) {
-        $_imagemagickAvailable = true;
-        return true;
-    } else {
-        $_imagemagickAvailable = false;
-        return false;
-    }
+    
+    $_imagemagickAvailable = (extension_loaded('imagick'))?true:false;
+    return $_imagemagickAvailable;
 }
 
 /**