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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 "cvt.h" | |
6 | |
7 // cvt - Control Value Table | |
8 // http://www.microsoft.com/typography/otspec/cvt.htm | |
9 | |
10 #define TABLE_NAME "cvt" | |
11 | |
12 namespace ots { | |
13 | |
14 bool ots_cvt_parse(OpenTypeFile *file, const uint8_t *data, size_t length) { | |
15 Buffer table(data, length); | |
16 | |
17 OpenTypeCVT *cvt = new OpenTypeCVT; | |
18 file->cvt = cvt; | |
19 | |
20 if (length >= 128 * 1024u) { | |
21 return OTS_FAILURE_MSG("Length (%d) > 120K"); // almost all cvt tables are
less than 4k bytes. | |
22 } | |
23 | |
24 if (length % 2 != 0) { | |
25 return OTS_FAILURE_MSG("Uneven cvt length (%d)", length); | |
26 } | |
27 | |
28 if (!table.Skip(length)) { | |
29 return OTS_FAILURE_MSG("Length too high"); | |
30 } | |
31 | |
32 cvt->data = data; | |
33 cvt->length = length; | |
34 return true; | |
35 } | |
36 | |
37 bool ots_cvt_should_serialise(OpenTypeFile *file) { | |
38 if (!file->glyf) { | |
39 return false; // this table is not for CFF fonts. | |
40 } | |
41 return file->cvt; | |
42 } | |
43 | |
44 bool ots_cvt_serialise(OTSStream *out, OpenTypeFile *file) { | |
45 const OpenTypeCVT *cvt = file->cvt; | |
46 | |
47 if (!out->Write(cvt->data, cvt->length)) { | |
48 return OTS_FAILURE_MSG("Failed to write CVT table"); | |
49 } | |
50 | |
51 return true; | |
52 } | |
53 | |
54 void ots_cvt_free(OpenTypeFile *file) { | |
55 delete file->cvt; | |
56 } | |
57 | |
58 } // namespace ots | |
59 | |
60 #undef TABLE_NAME | |
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