import FIREFOX_52_6_0esr_RELEASE from mozilla-esr52 hg repo

gfx/ots/src/prep.cc

@@ -0,0 +1,59 @@
+// 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 "prep.h"
+
+// prep - Control Value Program
+// http://www.microsoft.com/typography/otspec/prep.htm
+
+#define TABLE_NAME "prep"
+
+namespace ots {
+
+bool ots_prep_parse(Font *font, const uint8_t *data, size_t length) {
+  Buffer table(data, length);
+
+  OpenTypePREP *prep = new OpenTypePREP;
+  font->prep = prep;
+
+  if (length >= 128 * 1024u) {
+    return OTS_FAILURE_MSG("table length %ld > 120K", length);  // almost all prep tables are less than 9k bytes.
+  }
+
+  if (!table.Skip(length)) {
+    return OTS_FAILURE_MSG("Failed to read table of length %ld", length);
+  }
+
+  prep->data = data;
+  prep->length = length;
+  return true;
+}
+
+bool ots_prep_should_serialise(Font *font) {
+  if (!font->glyf) return false;  // this table is not for CFF fonts.
+  return font->prep != NULL;
+}
+
+bool ots_prep_serialise(OTSStream *out, Font *font) {
+  const OpenTypePREP *prep = font->prep;
+
+  if (!out->Write(prep->data, prep->length)) {
+    return OTS_FAILURE_MSG("Failed to write table length");
+  }
+
+  return true;
+}
+
+void ots_prep_reuse(Font *font, Font *other) {
+  font->prep = other->prep;
+  font->prep_reused = true;
+}
+
+void ots_prep_free(Font *font) {
+  delete font->prep;
+}
+
+}  // namespace ots
+
+#undef TABLE_NAME