Updating to new OTS repo from https://github.com/khaledhosny/ots.git

src/prep.cc

 // Copyright (c) 2009 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "prep.h"
 
 // prep - Control Value Program
-// http://www.microsoft.com/opentype/otspec/prep.htm
+// http://www.microsoft.com/typography/otspec/prep.htm
+
+#define TABLE_NAME "prep"
 
 namespace ots {
 
 bool ots_prep_parse(OpenTypeFile *file, const uint8_t *data, size_t length) {
   Buffer table(data, length);
 
   OpenTypePREP *prep = new OpenTypePREP;
   file->prep = prep;
 
   if (length >= 128 * 1024u) {
-    return OTS_FAILURE();  // almost all prep tables are less than 9k bytes.
+    return OTS_FAILURE_MSG("table length %ld > 120K", length);  // almost all prep tables are less than 9k bytes.
   }
 
   if (!table.Skip(length)) {
-    return OTS_FAILURE();
+    return OTS_FAILURE_MSG("Failed to read table of length %ld", length);
   }
 
   prep->data = data;
   prep->length = length;
   return true;
 }
 
 bool ots_prep_should_serialise(OpenTypeFile *file) {
   if (!file->glyf) return false;  // this table is not for CFF fonts.
-  return g_transcode_hints && file->prep;
+  return file->prep;
 }
 
 bool ots_prep_serialise(OTSStream *out, OpenTypeFile *file) {
   const OpenTypePREP *prep = file->prep;
 
   if (!out->Write(prep->data, prep->length)) {
-    return OTS_FAILURE();
+    return OTS_FAILURE_MSG("Failed to write table length");
   }
 
   return true;
 }
 
 void ots_prep_free(OpenTypeFile *file) {
   delete file->prep;
 }
 
 }  // namespace ots
+
+#undef TABLE_NAME