modules/woff2/src/woff2_common.h

   1 /* Copyright 2014 Google Inc. All Rights Reserved.
   2
   3    Distributed under MIT license.
   4    See file LICENSE for detail or copy at https://opensource.org/licenses/MIT
   5 */
   6
   7 /* Common definition for WOFF2 encoding/decoding */
   8
   9 #ifndef WOFF2_WOFF2_COMMON_H_
  10 #define WOFF2_WOFF2_COMMON_H_
  11
  12 #include <stddef.h>
  13 #include <inttypes.h>
  14
  15 #include <string>
  16
  17 namespace woff2 {
  18
  19 static const uint32_t kWoff2Signature = 0x774f4632;  // "wOF2"
  20
  21 // Leave the first byte open to store flag_byte
  22 const unsigned int kWoff2FlagsTransform = 1 << 8;
  23
  24 // TrueType Collection ID string: 'ttcf'
  25 static const uint32_t kTtcFontFlavor = 0x74746366;
  26
  27 static const size_t kSfntHeaderSize = 12;
  28 static const size_t kSfntEntrySize = 16;
  29
  30 struct Point {
  31   int x;
  32   int y;
  33   bool on_curve;
  34 };
  35
  36 struct Table {
  37   uint32_t tag;
  38   uint32_t flags;
  39   uint32_t src_offset;
  40   uint32_t src_length;
  41
  42   uint32_t transform_length;
  43
  44   uint32_t dst_offset;
  45   uint32_t dst_length;
  46   const uint8_t* dst_data;
  47
  48   bool operator<(const Table& other) const {
  49     return tag < other.tag;
  50   }
  51 };
  52
  53
  54 // Size of the collection header. 0 if version indicates this isn't a
  55 // collection. Ref http://www.microsoft.com/typography/otspec/otff.htm,
  56 // True Type Collections
  57 size_t CollectionHeaderSize(uint32_t header_version, uint32_t num_fonts);
  58
  59 // Compute checksum over size bytes of buf
  60 uint32_t ComputeULongSum(const uint8_t* buf, size_t size);
  61
  62 } // namespace woff2
  63
  64 #endif  // WOFF2_WOFF2_COMMON_H_