1 files changed, 114 insertions, 0 deletions
diff --git a/sfntly/table/header.h b/sfntly/table/header.h
new file mode 100644
index 0000000..280e556
--- /dev/null
+++ b/sfntly/table/header.h
@@ -0,0 +1,114 @@
+/*
+ * Copyright 2011 Google Inc. All Rights Reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef SFNTLY_CPP_SRC_SFNTLY_TABLE_HEADER_H_
+#define SFNTLY_CPP_SRC_SFNTLY_TABLE_HEADER_H_
+
+#include "sfntly/port/refcount.h"
+
+namespace sfntly {
+
+class Header : public RefCounted<Header> {
+ public:
+  // Make a partial header with only the basic info for an empty new table.
+  explicit Header(int32_t tag);
+
+  // Make a partial header with only the basic info for a new table.
+  Header(int32_t tag, int32_t length);
+
+  // Make a full header as read from an existing font.
+  Header(int32_t tag, int64_t checksum, int32_t offset, int32_t length);
+  virtual ~Header();
+
+  // Get the table tag.
+  int32_t tag() { return tag_; }
+
+  // Get the table offset. The offset is from the start of the font file.  This
+  // offset value is what was read from the font file during construction of the
+  // font. It may not be meaningful if the font was maninpulated through the
+  // builders.
+  int32_t offset() { return offset_; }
+
+  // Is the offset in the header valid. The offset will not be valid if the
+  // table was constructed during building and has no physical location in a
+  // font file.
+  bool offset_valid() { return offset_valid_; }
+
+  // Get the length of the table as recorded in the table record header.  During
+  // building the header length will reflect the length that was initially read
+  // from the font file. This may not be consistent with the current state of
+  // the data.
+  int32_t length() { return length_; }
+
+  // Is the length in the header valid. The length will not be valid if the
+  // table was constructed during building and has no physical location in a
+  // font file until the table is built from the builder.
+  bool length_valid() { return length_valid_; }
+
+  // Get the checksum for the table as recorded in the table record header.
+  int64_t checksum() { return checksum_; }
+
+  // Is the checksum valid. The checksum will not be valid if the table was
+  // constructed during building and has no physical location in a font file.
+  // Note that this does *NOT* check the validity of the checksum against
+  // the calculated checksum for the table data.
+  bool checksum_valid() { return checksum_valid_; }
+
+  // UNIMPLEMENTED: boolean equals(Object obj)
+  //                int hashCode()
+  //                string toString()
+
+ private:
+  int32_t tag_;
+  int32_t offset_;
+  bool offset_valid_;
+  int32_t length_;
+  bool length_valid_;
+  int64_t checksum_;
+  bool checksum_valid_;
+
+  friend class HeaderComparatorByOffset;
+  friend class HeaderComparatorByTag;
+};
+typedef Ptr<Header> HeaderPtr;
+
+class HeaderComparator {
+ public:
+  virtual ~HeaderComparator() {}
+  virtual bool operator()(const HeaderPtr h1,
+                          const HeaderPtr h2) = 0;
+};
+
+class HeaderComparatorByOffset : public HeaderComparator {
+ public:
+  virtual ~HeaderComparatorByOffset() {}
+  virtual bool operator()(const HeaderPtr h1,
+                          const HeaderPtr h2);
+};
+
+class HeaderComparatorByTag : public HeaderComparator {
+ public:
+  virtual ~HeaderComparatorByTag() {}
+  virtual bool operator()(const HeaderPtr h1,
+                          const HeaderPtr h2);
+};
+
+typedef std::set<HeaderPtr, HeaderComparatorByOffset> HeaderOffsetSortedSet;
+typedef std::set<HeaderPtr, HeaderComparatorByTag> HeaderTagSortedSet;
+
+}  // namespace sfntly
+
+#endif  // SFNTLY_CPP_SRC_SFNTLY_TABLE_HEADER_H_