| // Copyright (c) 2009 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #include "cvt.h" |
| |
| // cvt - Control Value Table |
| // http://www.microsoft.com/typography/otspec/cvt.htm |
| |
| #define TABLE_NAME "cvt" |
| |
| namespace ots { |
| |
| bool ots_cvt_parse(OpenTypeFile *file, const uint8_t *data, size_t length) { |
| Buffer table(data, length); |
| |
| OpenTypeCVT *cvt = new OpenTypeCVT; |
| file->cvt = cvt; |
| |
| if (length >= 128 * 1024u) { |
| return OTS_FAILURE_MSG("Length (%d) > 120K"); // almost all cvt tables are less than 4k bytes. |
| } |
| |
| if (length % 2 != 0) { |
| return OTS_FAILURE_MSG("Uneven cvt length (%d)", length); |
| } |
| |
| if (!table.Skip(length)) { |
| return OTS_FAILURE_MSG("Length too high"); |
| } |
| |
| cvt->data = data; |
| cvt->length = length; |
| return true; |
| } |
| |
| bool ots_cvt_should_serialise(OpenTypeFile *file) { |
| if (!file->glyf) { |
| return false; // this table is not for CFF fonts. |
| } |
| return file->cvt != NULL; |
| } |
| |
| bool ots_cvt_serialise(OTSStream *out, OpenTypeFile *file) { |
| const OpenTypeCVT *cvt = file->cvt; |
| |
| if (!out->Write(cvt->data, cvt->length)) { |
| return OTS_FAILURE_MSG("Failed to write CVT table"); |
| } |
| |
| return true; |
| } |
| |
| void ots_cvt_free(OpenTypeFile *file) { |
| delete file->cvt; |
| } |
| |
| } // namespace ots |
| |
| #undef TABLE_NAME |