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+// Copyright 2014 Google Inc. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// Common definition for WOFF2 encoding/decoding
+
+#ifndef WOFF2_WOFF2_COMMON_H_
+#define WOFF2_WOFF2_COMMON_H_
+
+#include <stddef.h>
+#include <inttypes.h>
+
+#include <string>
+
+namespace woff2 {
+
+static const uint32_t kWoff2Signature = 0x774f4632; // "wOF2"
+
+// Leave the first byte open to store flag_byte
+const unsigned int kWoff2FlagsTransform = 1 << 8;
+
+// TrueType Collection ID string: 'ttcf'
+static const uint32_t kTtcFontFlavor = 0x74746366;
+
+static const size_t kSfntHeaderSize = 12;
+static const size_t kSfntEntrySize = 16;
+
+struct Point {
+ int x;
+ int y;
+ bool on_curve;
+};
+
+struct Table {
+ uint32_t tag;
+ uint32_t flags;
+ uint32_t src_offset;
+ uint32_t src_length;
+
+ uint32_t transform_length;
+
+ uint32_t dst_offset;
+ uint32_t dst_length;
+ const uint8_t* dst_data;
+
+ bool operator<(const Table& other) const {
+ return tag < other.tag;
+ }
+};
+
+
+// Size of the collection header. 0 if version indicates this isn't a
+// collection. Ref http://www.microsoft.com/typography/otspec/otff.htm,
+// True Type Collections
+size_t CollectionHeaderSize(uint32_t header_version, uint32_t num_fonts);
+
+// Compute checksum over size bytes of buf
+uint32_t ComputeULongSum(const uint8_t* buf, size_t size);
+
+} // namespace woff2
+
+#endif // WOFF2_WOFF2_COMMON_H_