Line data    Source code

       1             : // Copyright 2014 Google Inc. All Rights Reserved.
       2             : //
       3             : // Licensed under the Apache License, Version 2.0 (the "License");
       4             : // you may not use this file except in compliance with the License.
       5             : // You may obtain a copy of the License at
       6             : //
       7             : // http://www.apache.org/licenses/LICENSE-2.0
       8             : //
       9             : // Unless required by applicable law or agreed to in writing, software
      10             : // distributed under the License is distributed on an "AS IS" BASIS,
      11             : // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
      12             : // See the License for the specific language governing permissions and
      13             : // limitations under the License.
      14             : //
      15             : // Common definition for WOFF2 encoding/decoding
      16             : 
      17             : #ifndef WOFF2_WOFF2_COMMON_H_
      18             : #define WOFF2_WOFF2_COMMON_H_
      19             : 
      20             : #include <stddef.h>
      21             : #include <inttypes.h>
      22             : 
      23             : #include <string>
      24             : 
      25             : namespace woff2 {
      26             : 
      27             : static const uint32_t kWoff2Signature = 0x774f4632;  // "wOF2"
      28             : 
      29             : // Leave the first byte open to store flag_byte
      30             : const unsigned int kWoff2FlagsTransform = 1 << 8;
      31             : 
      32             : // TrueType Collection ID string: 'ttcf'
      33             : static const uint32_t kTtcFontFlavor = 0x74746366;
      34             : 
      35             : static const size_t kSfntHeaderSize = 12;
      36             : static const size_t kSfntEntrySize = 16;
      37             : 
      38             : struct Point {
      39             :   int x;
      40             :   int y;
      41             :   bool on_curve;
      42             : };
      43             : 
      44             : struct Table {
      45             :   uint32_t tag;
      46             :   uint32_t flags;
      47             :   uint32_t src_offset;
      48             :   uint32_t src_length;
      49             : 
      50             :   uint32_t transform_length;
      51             : 
      52             :   uint32_t dst_offset;
      53             :   uint32_t dst_length;
      54             :   const uint8_t* dst_data;
      55             : 
      56           0 :   bool operator<(const Table& other) const {
      57           0 :     return tag < other.tag;
      58             :   }
      59             : };
      60             : 
      61             : 
      62             : // Size of the collection header. 0 if version indicates this isn't a
      63             : // collection. Ref http://www.microsoft.com/typography/otspec/otff.htm,
      64             : // True Type Collections
      65             : size_t CollectionHeaderSize(uint32_t header_version, uint32_t num_fonts);
      66             : 
      67             : // Compute checksum over size bytes of buf
      68             : uint32_t ComputeULongSum(const uint8_t* buf, size_t size);
      69             : 
      70             : } // namespace woff2
      71             : 
      72             : #endif  // WOFF2_WOFF2_COMMON_H_