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1 // Copyright (c) 2009 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4 
5 #include "prep.h"
6 
7 // prep - Control Value Program
8 // http://www.microsoft.com/opentype/otspec/prep.htm
9 
10 namespace ots {
11 
ots_prep_parse(OpenTypeFile * file,const uint8_t * data,size_t length)12 bool ots_prep_parse(OpenTypeFile *file, const uint8_t *data, size_t length) {
13   Buffer table(data, length);
14 
15   OpenTypePREP *prep = new OpenTypePREP;
16   file->prep = prep;
17 
18   if (length >= 128 * 1024u) {
19     return OTS_FAILURE();  // almost all prep tables are less than 9k bytes.
20   }
21 
22   if (!table.Skip(length)) {
23     return OTS_FAILURE();
24   }
25 
26   prep->data = data;
27   prep->length = length;
28   return true;
29 }
30 
ots_prep_should_serialise(OpenTypeFile * file)31 bool ots_prep_should_serialise(OpenTypeFile *file) {
32   if (!file->glyf) return false;  // this table is not for CFF fonts.
33   return g_transcode_hints && file->prep;
34 }
35 
ots_prep_serialise(OTSStream * out,OpenTypeFile * file)36 bool ots_prep_serialise(OTSStream *out, OpenTypeFile *file) {
37   const OpenTypePREP *prep = file->prep;
38 
39   if (!out->Write(prep->data, prep->length)) {
40     return OTS_FAILURE();
41   }
42 
43   return true;
44 }
45 
ots_prep_free(OpenTypeFile * file)46 void ots_prep_free(OpenTypeFile *file) {
47   delete file->prep;
48 }
49 
50 }  // namespace ots
51