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 "cvt.h"
6
7// cvt - Control Value Table
8// http://www.microsoft.com/opentype/otspec/cvt.htm
9
10namespace ots {
11
12bool ots_cvt_parse(OpenTypeFile *file, const uint8_t *data, size_t length) {
13  Buffer table(data, length);
14
15  OpenTypeCVT *cvt = new OpenTypeCVT;
16  file->cvt = cvt;
17
18  if (length >= 128 * 1024u) {
19    return OTS_FAILURE();  // almost all cvt tables are less than 4k bytes.
20  }
21
22  if (length % 2 != 0) {
23    return OTS_FAILURE();
24  }
25
26  if (!table.Skip(length)) {
27    return OTS_FAILURE();
28  }
29
30  cvt->data = data;
31  cvt->length = length;
32  return true;
33}
34
35bool ots_cvt_should_serialise(OpenTypeFile *file) {
36  if (!file->glyf) {
37    return false;  // this table is not for CFF fonts.
38  }
39  return g_transcode_hints && file->cvt;
40}
41
42bool ots_cvt_serialise(OTSStream *out, OpenTypeFile *file) {
43  const OpenTypeCVT *cvt = file->cvt;
44
45  if (!out->Write(cvt->data, cvt->length)) {
46    return OTS_FAILURE();
47  }
48
49  return true;
50}
51
52void ots_cvt_free(OpenTypeFile *file) {
53  delete file->cvt;
54}
55
56}  // namespace ots
57