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+/*
+ * 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_FONT_FACTORY_H_
+#define SFNTLY_CPP_SRC_SFNTLY_FONT_FACTORY_H_
+
+#include <vector>
+
+#include "sfntly/port/refcount.h"
+#include "sfntly/port/type.h"
+#include "sfntly/font.h"
+
+namespace sfntly {
+
+class FontFactory : public RefCounted<FontFactory> {
+ public:
+  virtual ~FontFactory();
+
+  // Factory method for the construction of a font factory.
+  static CALLER_ATTACH FontFactory* GetInstance();
+
+  // Toggle whether fonts that are loaded are fingerprinted with a SHA-1 hash.
+  // If a font is fingerprinted then a SHA-1 hash is generated at load time and
+  // stored in the font. This is useful for uniquely identifying fonts. By
+  // default this is turned on.
+  // @param fingerprint whether fingerprinting should be turned on or off
+  // TODO(arthurhsu): IMPLEMENT: C++ port currently don't do any SHA-1
+  void FingerprintFont(bool fingerprint);
+  bool FingerprintFont();
+
+  // Load the font(s) from the input stream. The current settings on the factory
+  // are used during the loading process. One or more fonts are returned if the
+  // stream contains valid font data. Some font container formats may have more
+  // than one font and in this case multiple font objects will be returned. If
+  // the data in the stream cannot be parsed or is invalid an array of size zero
+  // will be returned.
+  void LoadFonts(InputStream* is, FontArray* output);
+
+  // ByteArray font loading
+  // Load the font(s) from the byte array. The current settings on the factory
+  // are used during the loading process. One or more fonts are returned if the
+  // stream contains valid font data. Some font container formats may have more
+  // than one font and in this case multiple font objects will be returned. If
+  // the data in the stream cannot be parsed or is invalid an array of size zero
+  // will be returned.
+  void LoadFonts(ByteVector* b, FontArray* output);
+
+  // Load the font(s) from the input stream into font builders. The current
+  // settings on the factory are used during the loading process. One or more
+  // font builders are returned if the stream contains valid font data. Some
+  // font container formats may have more than one font and in this case
+  // multiple font builder objects will be returned. If the data in the stream
+  // cannot be parsed or is invalid an array of size zero will be returned.
+  void LoadFontsForBuilding(InputStream* is, FontBuilderArray* output);
+
+  // Load the font(s) from the byte array into font builders. The current
+  // settings on the factory are used during the loading process. One or more
+  // font builders are returned if the stream contains valid font data. Some
+  // font container formats may have more than one font and in this case
+  // multiple font builder objects will be returned. If the data in the stream
+  // cannot be parsed or is invalid an array of size zero will be returned.
+  void LoadFontsForBuilding(ByteVector* b, FontBuilderArray* output);
+
+  // Font serialization
+  // Serialize the font to the output stream.
+  // NOTE: in this port we attempted not to implement I/O stream because dealing
+  //       with cross-platform I/O stream itself is big enough as a project.
+  //       Byte buffer it is.
+  void SerializeFont(Font* font, OutputStream* os);
+
+  // Set the table ordering to be used in serializing a font. The table ordering
+  // is an ordered list of table ids and tables will be serialized in the order
+  // given. Any tables whose id is not listed in the ordering will be placed in
+  // an unspecified order following those listed.
+  void SetSerializationTableOrdering(const IntegerList& table_ordering);
+
+  // Get an empty font builder for creating a new font from scratch.
+  CALLER_ATTACH Font::Builder* NewFontBuilder();
+
+ private:
+  // Offsets to specific elements in the underlying data. These offsets are
+  // relative to the start of the table or the start of sub-blocks within the
+  // table.
+  struct Offset {
+    enum {
+      // Offsets within the main directory.
+      kTTCTag = 0,
+      kVersion = 4,
+      kNumFonts = 8,
+      kOffsetTable = 12,
+
+      // TTC Version 2.0 extensions.
+      // Offsets from end of OffsetTable.
+      kulDsigTag = 0,
+      kulDsigLength = 4,
+      kulDsigOffset = 8
+    };
+  };
+
+  FontFactory();
+
+  CALLER_ATTACH Font* LoadSingleOTF(InputStream* is);
+  CALLER_ATTACH Font* LoadSingleOTF(WritableFontData* wfd);
+
+  void LoadCollection(InputStream* is, FontArray* output);
+  void LoadCollection(WritableFontData* wfd, FontArray* output);
+
+  CALLER_ATTACH Font::Builder* LoadSingleOTFForBuilding(InputStream* is);
+  CALLER_ATTACH Font::Builder*
+      LoadSingleOTFForBuilding(WritableFontData* wfd,
+                               int32_t offset_to_offset_table);
+
+  void LoadCollectionForBuilding(InputStream* is, FontBuilderArray* builders);
+  void LoadCollectionForBuilding(WritableFontData* ba,
+                                 FontBuilderArray* builders);
+
+  static bool IsCollection(PushbackInputStream* pbis);
+  static bool IsCollection(ReadableFontData* wfd);
+
+  bool fingerprint_;
+  IntegerList table_ordering_;
+};
+typedef Ptr<FontFactory> FontFactoryPtr;
+
+}  // namespace sfntly
+
+#endif  // SFNTLY_CPP_SRC_SFNTLY_FONT_FACTORY_H_