Calculate correct checksum for the field header

2011-06-29 21:29:33 +02:00 · 2011-06-29 21:29:33 +02:00 · 0a7531cb33
commit 0a7531cb33
parent 68aa1f9bbb
1 changed files with 3 additions and 6 deletions
--- a/fonts.js
+++ b/fonts.js
@ -247,12 +247,9 @@ var Font = (function () {
    var length = data.length;

    // checksum
-    var checksum = tag.charCodeAt(0) +
-                   tag.charCodeAt(1) +
-                   tag.charCodeAt(2) +
-                   tag.charCodeAt(3) +
-                   offset +
-                   length;
+    var checksum = 0;
+    for (var i = 0; i < length; i+=4)
+      checksum += FontsUtils.bytesToInteger([data[i], data[i+1], data[i+2], data[i+3]]);

    var tableEntry = tag + string32(checksum) + string32(offset) + string32(length);
    tableEntry = stringToArray(tableEntry);