2 files changed, 33 insertions, 0 deletions
diff --git a/modules/gallery/helpers/MY_num.php b/modules/gallery/helpers/MY_num.php
index 9787044c..842a2ee3 100644
--- a/modules/gallery/helpers/MY_num.php
+++ b/modules/gallery/helpers/MY_num.php
@@ -37,4 +37,18 @@ class num extends num_Core {
 
     return $val;
   }
+
+  /**
+   * Convert a size value as accepted by PHP's shorthand to bytes.
+   * ref: http://us2.php.net/manual/en/function.ini-get.php
+   * ref: http://us2.php.net/manual/en/faq.using.php#faq.using.shorthandbytes
+   */
+  static function convert_to_human_readable($num) {
+    foreach (array("G" => 1e9, "M" => 1e6, "K" => 1e3) as $k => $v) {
+      if ($num > $v) {
+        $num = round($num / $v) . $k;
+      }
+    }
+    return $num;
+  }
 }
diff --git a/modules/gallery/helpers/graphics.php b/modules/gallery/helpers/graphics.php
index f374f9da..8d8853b0 100644
--- a/modules/gallery/helpers/graphics.php
+++ b/modules/gallery/helpers/graphics.php
@@ -423,4 +423,23 @@ class graphics_Core {
 
     return true;
   }
+
+  /**
+   * Return the max file size that this graphics toolkit can handle.
+   */
+  static function max_filesize() {
+    if (module::get_var("gallery", "graphics_toolkit") == "gd") {
+      $memory_limit = trim(ini_get("memory_limit"));
+      $memory_limit_bytes = num::convert_to_bytes($memory_limit);
+
+      // GD expands images in memory and uses 4 bytes of RAM for every byte
+      // in the file.
+      $max_filesize = $memory_limit_bytes / 4;
+      $max_filesize_human_readable = num::convert_to_human_readable($max_filesize);
+      return array($max_filesize, $max_filesize_human_readable);
+    }
+
+    // Some arbitrarily large size
+    return array(1000000000, "1G");
+  }
 }