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