/* Copyright 2014 Google Inc. All Rights Reserved.

   Distributed under MIT license.

   See file LICENSE for detail or copy at https://opensource.org/licenses/MIT

*/

/* 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_