Line data    Source code

       1             : /*
       2             :  * Copyright 2011 Google Inc. All Rights Reserved.
       3             :  *
       4             :  * Licensed under the Apache License, Version 2.0 (the "License");
       5             :  * you may not use this file except in compliance with the License.
       6             :  * You may obtain a copy of the License at
       7             :  *
       8             :  *      http://www.apache.org/licenses/LICENSE-2.0
       9             :  *
      10             :  * Unless required by applicable law or agreed to in writing, software
      11             :  * distributed under the License is distributed on an "AS IS" BASIS,
      12             :  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
      13             :  * See the License for the specific language governing permissions and
      14             :  * limitations under the License.
      15             :  */
      16             : 
      17             : #ifndef SFNTLY_CPP_SRC_SFNTLY_TABLE_HEADER_H_
      18             : #define SFNTLY_CPP_SRC_SFNTLY_TABLE_HEADER_H_
      19             : 
      20             : #include "sfntly/port/refcount.h"
      21             : 
      22             : namespace sfntly {
      23             : 
      24             : class Header : public RefCounted<Header> {
      25             :  public:
      26             :   // Make a partial header with only the basic info for an empty new table.
      27             :   explicit Header(int32_t tag);
      28             : 
      29             :   // Make a partial header with only the basic info for a new table.
      30             :   Header(int32_t tag, int32_t length);
      31             : 
      32             :   // Make a full header as read from an existing font.
      33             :   Header(int32_t tag, int64_t checksum, int32_t offset, int32_t length);
      34             :   virtual ~Header();
      35             : 
      36             :   // Get the table tag.
      37           0 :   int32_t tag() { return tag_; }
      38             : 
      39             :   // Get the table offset. The offset is from the start of the font file.  This
      40             :   // offset value is what was read from the font file during construction of the
      41             :   // font. It may not be meaningful if the font was maninpulated through the
      42             :   // builders.
      43           0 :   int32_t offset() { return offset_; }
      44             : 
      45             :   // Is the offset in the header valid. The offset will not be valid if the
      46             :   // table was constructed during building and has no physical location in a
      47             :   // font file.
      48             :   bool offset_valid() { return offset_valid_; }
      49             : 
      50             :   // Get the length of the table as recorded in the table record header.  During
      51             :   // building the header length will reflect the length that was initially read
      52             :   // from the font file. This may not be consistent with the current state of
      53             :   // the data.
      54           0 :   int32_t length() { return length_; }
      55             : 
      56             :   // Is the length in the header valid. The length will not be valid if the
      57             :   // table was constructed during building and has no physical location in a
      58             :   // font file until the table is built from the builder.
      59             :   bool length_valid() { return length_valid_; }
      60             : 
      61             :   // Get the checksum for the table as recorded in the table record header.
      62           0 :   int64_t checksum() { return checksum_; }
      63             : 
      64             :   // Is the checksum valid. The checksum will not be valid if the table was
      65             :   // constructed during building and has no physical location in a font file.
      66             :   // Note that this does *NOT* check the validity of the checksum against
      67             :   // the calculated checksum for the table data.
      68             :   bool checksum_valid() { return checksum_valid_; }
      69             : 
      70             :   // UNIMPLEMENTED: boolean equals(Object obj)
      71             :   //                int hashCode()
      72             :   //                string toString()
      73             : 
      74             :  private:
      75             :   int32_t tag_;
      76             :   int32_t offset_;
      77             :   bool offset_valid_;
      78             :   int32_t length_;
      79             :   bool length_valid_;
      80             :   int64_t checksum_;
      81             :   bool checksum_valid_;
      82             : 
      83             :   friend class HeaderComparatorByOffset;
      84             :   friend class HeaderComparatorByTag;
      85             : };
      86             : typedef Ptr<Header> HeaderPtr;
      87             : 
      88           0 : class HeaderComparator {
      89             :  public:
      90           0 :   virtual ~HeaderComparator() {}
      91             :   virtual bool operator()(const HeaderPtr h1,
      92             :                           const HeaderPtr h2) = 0;
      93             : };
      94             : 
      95           0 : class HeaderComparatorByOffset : public HeaderComparator {
      96             :  public:
      97           0 :   virtual ~HeaderComparatorByOffset() {}
      98             :   virtual bool operator()(const HeaderPtr h1,
      99             :                           const HeaderPtr h2);
     100             : };
     101             : 
     102           0 : class HeaderComparatorByTag : public HeaderComparator {
     103             :  public:
     104           0 :   virtual ~HeaderComparatorByTag() {}
     105             :   virtual bool operator()(const HeaderPtr h1,
     106             :                           const HeaderPtr h2);
     107             : };
     108             : 
     109             : typedef std::set<HeaderPtr, HeaderComparatorByOffset> HeaderOffsetSortedSet;
     110             : typedef std::set<HeaderPtr, HeaderComparatorByTag> HeaderTagSortedSet;
     111             : 
     112             : }  // namespace sfntly
     113             : 
     114             : #endif  // SFNTLY_CPP_SRC_SFNTLY_TABLE_HEADER_H_