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. tag()37 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. offset()43 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. offset_valid()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. length()54 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. length_valid()59 bool length_valid() { return length_valid_; } 60 61 // Get the checksum for the table as recorded in the table record header. checksum()62 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. checksum_valid()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 class HeaderComparator { 89 public: ~HeaderComparator()90 virtual ~HeaderComparator() {} 91 virtual bool operator()(const HeaderPtr h1, 92 const HeaderPtr h2) const = 0; 93 }; 94 95 class HeaderComparatorByOffset : public HeaderComparator { 96 public: ~HeaderComparatorByOffset()97 virtual ~HeaderComparatorByOffset() {} 98 virtual bool operator()(const HeaderPtr h1, 99 const HeaderPtr h2) const; 100 }; 101 102 class HeaderComparatorByTag : public HeaderComparator { 103 public: ~HeaderComparatorByTag()104 virtual ~HeaderComparatorByTag() {} 105 virtual bool operator()(const HeaderPtr h1, 106 const HeaderPtr h2) const; 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_ 115