Index: t3lib/class.t3lib_div.php
===================================================================
--- t3lib/class.t3lib_div.php	(Revision 5203)
+++ t3lib/class.t3lib_div.php	(Arbeitskopie)
@@ -3125,8 +3125,51 @@
 	}
 
 
+	/**
+	 * Returns the maximum upload size for a file that is allowed. Measured in KB.
+	 * This might be handy to find out the real upload limit that is possible for this 
+	 * TYPO3 installation. The first parameter can be used to set something that overrides
+	 * the maxFileSize, usually for the TCA values.
+	 *
+	 * @param	int the number of Kilobytes (!) that should be used as the initial Limit, otherwise $TYPO3_CONF_VARS['BE']['maxFileSize'] will be used
+	 * @return	int the maximum size of uploads that are allowed
+	 */
+	public static function getMaxUploadFileSize($localLimit = 0) {
+			// don't allow more than the global max file size at all
+		$t3Limit = intval($localLimit > 0 ? $localLimit : $GLOBALS['TYPO3_CONF_VARS']['BE']['maxFileSize']);
+			// as TYPO3 is handling the file size in KB, multiply by 1024 to get bytes
+		$t3Limit = $t3Limit*1024;
 
+			// check for PHP restrictions of the maximum size of one of the $_FILES
+		$phpUploadLimit = ini_get('upload_max_filesize');
+		if (stripos($phpUploadLimit, 'G')) {
+			$phpUploadLimit = intval($phpUploadLimit)*1024*1024*1024;
+		} else if (stripos($phpUploadLimit, 'M')) {
+			$phpUploadLimit = intval($phpUploadLimit)*1024*1024;
+		} else if (stripos($phpUploadLimit, 'K')) {
+			$phpUploadLimit = intval($phpUploadLimit)*1024;
+		} else {
+			$phpUploadLimit = intval($phpUploadLimit);
+		}
+			// check for PHP restrictions of the maximum $_POST size
+		$phpPostLimit = ini_get('post_max_size');
+		if (stripos($phpPostLimit, 'G')) {
+			$phpPostLimit = intval($phpPostLimit)*1024*1024*1024;
+		} else if (stripos($phpPostLimit, 'M')) {
+			$phpPostLimit = intval($phpPostLimit)*1024*1024;
+		} else if (stripos($phpPostLimit, 'K')) {
+			$phpPostLimit = intval($phpPostLimit)*1024;
+		} else {
+			$phpPostLimit = intval($phpPostLimit);
+		}
+		
+			// if the total amount of post data is smaller (!) than the upload_max_filesize directive,
+			// then this is the real limit in PHP
+		$phpUploadLimit = ($phpPostLimit < $phpUploadLimit ? $phpPostLimit : $phpUploadLimit);
 
+			// is the allowed PHP limit (upload_max_filesize) lower than the TYPO3 limit?, also: revert back to KB
+		return round($phpUploadLimit < $t3Limit ? $phpUploadLimit : $t3Limit)/1024;
+	}
 
 
 
Index: t3lib/class.t3lib_extfilefunc.php
===================================================================
--- t3lib/class.t3lib_extfilefunc.php	(Revision 5203)
+++ t3lib/class.t3lib_extfilefunc.php	(Arbeitskopie)
@@ -163,11 +163,11 @@
 		$this->unzipPath = $GLOBALS['TYPO3_CONF_VARS']['BE']['unzip_path'];
 
 		$maxFileSize = intval($GLOBALS['TYPO3_CONF_VARS']['BE']['maxFileSize']);
-		if ($maxFileSize>0)	{
+		if ($maxFileSize > 0) {
 			$this->maxCopyFileSize = $maxFileSize;
 			$this->maxMoveFileSize = $maxFileSize;
-			$this->maxUploadFileSize = $maxFileSize;
 		}
+		$this->maxUploadFileSize = t3lib_div::getMaxUploadFileSize();
 
 			// Initializing file processing commands:
 		$this->fileCmdMap = $fileCmds;