michael@0: // Copyright (c) 2009 The Chromium Authors. All rights reserved.
michael@0: // Use of this source code is governed by a BSD-style license that can be
michael@0: // found in the LICENSE file.
michael@0: 
michael@0: #include "prep.h"
michael@0: 
michael@0: // prep - Control Value Program
michael@0: // http://www.microsoft.com/typography/otspec/prep.htm
michael@0: 
michael@0: #define TABLE_NAME "prep"
michael@0: 
michael@0: namespace ots {
michael@0: 
michael@0: bool ots_prep_parse(OpenTypeFile *file, const uint8_t *data, size_t length) {
michael@0:   Buffer table(data, length);
michael@0: 
michael@0:   OpenTypePREP *prep = new OpenTypePREP;
michael@0:   file->prep = prep;
michael@0: 
michael@0:   if (length >= 128 * 1024u) {
michael@0:     return OTS_FAILURE_MSG("table length %ld > 120K", length);  // almost all prep tables are less than 9k bytes.
michael@0:   }
michael@0: 
michael@0:   if (!table.Skip(length)) {
michael@0:     return OTS_FAILURE_MSG("Failed to read table of length %ld", length);
michael@0:   }
michael@0: 
michael@0:   prep->data = data;
michael@0:   prep->length = length;
michael@0:   return true;
michael@0: }
michael@0: 
michael@0: bool ots_prep_should_serialise(OpenTypeFile *file) {
michael@0:   if (!file->glyf) return false;  // this table is not for CFF fonts.
michael@0:   return g_transcode_hints && file->prep;
michael@0: }
michael@0: 
michael@0: bool ots_prep_serialise(OTSStream *out, OpenTypeFile *file) {
michael@0:   const OpenTypePREP *prep = file->prep;
michael@0: 
michael@0:   if (!out->Write(prep->data, prep->length)) {
michael@0:     return OTS_FAILURE_MSG("Failed to write table length");
michael@0:   }
michael@0: 
michael@0:   return true;
michael@0: }
michael@0: 
michael@0: void ots_prep_free(OpenTypeFile *file) {
michael@0:   delete file->prep;
michael@0: }
michael@0: 
michael@0: }  // namespace ots