Give some real error codes back

examples/upload.php

@@ -80,7 +80,7 @@
 	$contentType = $_SERVER["CONTENT_TYPE"];
 
 // Handle non multipart uploads older WebKit versions didn't support multipart in HTML5
-if (!strstr($contentType, "multipart")) {
+if (strstr($contentType, "multipart")) {
 	if (isset($_FILES['file']['tmp_name']) && is_uploaded_file($_FILES['file']['tmp_name'])) {
 		// Open temp file
 		$out = fopen("{$filePath}.part", $chunk == 0 ? "wb" : "ab");
@@ -98,8 +98,18 @@
 			@unlink($_FILES['file']['tmp_name']);
 		} else
 			die('{"jsonrpc" : "2.0", "error" : {"code": 102, "message": "Failed to open output stream."}, "id" : "id"}');
-	} else
-		die('{"jsonrpc" : "2.0", "error" : {"code": 103, "message": "Failed to move uploaded file."}, "id" : "id"}');
+	} else {
+		$error_msg = "Unknown error (possibly POST_MAX_SIZE is smaller than MAX_FILE_SIZE?)";
+		if (isset($_FILES['file']['error']) && $_FILES['file']['error'] != 0) {
+			$errors = array(1 => "The uploaded file exceeds the upload_max_filesize directive in php.ini",
+					2 => "The uploaded file exceeds the MAX_FILE_SIZE directive that was specified in the HTML form",
+					3 => "The uploaded file was only partially uploaded",
+					4 => "No file was uploaded",
+					6 => "Missing a temporary folder");
+			$error_msg = "Error code {$_FILES['file']['error']} ({$errors[$_FILES['file']['error']]})";
+		}
+		die('{"jsonrpc" : "2.0", "error" : {"code": 103, "message": "Failed to move uploaded file: '.$error_msg.'."}, "id" : "id"}');
+	}
 } else {
 	// Open temp file
 	$out = fopen("{$filePath}.part", $chunk == 0 ? "wb" : "ab");