1 // Copyright (c) 2009-2017 The OTS 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/typography/otspec/cvt.htm
9 
10 namespace ots {
11 
Parse(const uint8_t * data,size_t length)12 bool OpenTypeCVT::Parse(const uint8_t *data, size_t length) {
13   Buffer table(data, length);
14 
15   if (length >= 128 * 1024u) {
16     return Error("Length (%d) > 120K");  // almost all cvt tables are less than 4k bytes.
17   }
18 
19   if (length % 2 != 0) {
20     return Error("Uneven table length (%d)", length);
21   }
22 
23   if (!table.Skip(length)) {
24     return Error("Table length too high");
25   }
26 
27   this->data = data;
28   this->length = length;
29   return true;
30 }
31 
Serialize(OTSStream * out)32 bool OpenTypeCVT::Serialize(OTSStream *out) {
33   if (!out->Write(this->data, this->length)) {
34     return Error("Failed to write cvt table");
35   }
36 
37   return true;
38 }
39 
ShouldSerialize()40 bool OpenTypeCVT::ShouldSerialize() {
41   return Table::ShouldSerialize() &&
42          // this table is not for CFF fonts.
43          GetFont()->GetTable(OTS_TAG_GLYF) != NULL;
44 }
45 
46 }  // namespace ots
47