1 files changed, 65 insertions, 0 deletions
diff --git a/gfx/ots/src/cvt.cc b/gfx/ots/src/cvt.cc
new file mode 100644
index 000000000..1402e7c06
--- /dev/null
+++ b/gfx/ots/src/cvt.cc
@@ -0,0 +1,65 @@
+// 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(Font *font, const uint8_t *data, size_t length) {
+  Buffer table(data, length);
+
+  OpenTypeCVT *cvt = new OpenTypeCVT;
+  font->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(Font *font) {
+  if (!font->glyf) {
+    return false;  // this table is not for CFF fonts.
+  }
+  return font->cvt != NULL;
+}
+
+bool ots_cvt_serialise(OTSStream *out, Font *font) {
+  const OpenTypeCVT *cvt = font->cvt;
+
+  if (!out->Write(cvt->data, cvt->length)) {
+    return OTS_FAILURE_MSG("Failed to write CVT table");
+  }
+
+  return true;
+}
+
+void ots_cvt_reuse(Font *font, Font *other) {
+  font->cvt = other->cvt;
+  font->cvt_reused = true;
+}
+
+void ots_cvt_free(Font *font) {
+  delete font->cvt;
+}
+
+}  // namespace ots
+
+#undef TABLE_NAME