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
10namespace ots {
11
12bool 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
31bool 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
36bool 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
46void ots_prep_free(OpenTypeFile *file) {
47  delete file->prep;
48}
49
50}  // namespace ots
51