| // Copyright 2013 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. |
| // |
| // Data model for a font file in sfnt format, reading and writing functions and |
| // accessors for the glyph data. |
| |
| #ifndef BROTLI_WOFF2_FONT_H_ |
| #define BROTLI_WOFF2_FONT_H_ |
| |
| #include <stddef.h> |
| #include <inttypes.h> |
| #include <map> |
| #include <vector> |
| |
| namespace woff2 { |
| |
| // Tags of popular tables. |
| static const uint32_t kGlyfTableTag = 0x676c7966; |
| static const uint32_t kHeadTableTag = 0x68656164; |
| static const uint32_t kLocaTableTag = 0x6c6f6361; |
| |
| // Represents an sfnt font file. Only the table directory is parsed, for the |
| // table data we only store a raw pointer, therefore a font object is valid only |
| // as long the data from which it was parsed is around. |
| struct Font { |
| uint32_t flavor; |
| uint16_t num_tables; |
| |
| struct Table { |
| uint32_t tag; |
| uint32_t checksum; |
| uint32_t offset; |
| uint32_t length; |
| const uint8_t* data; |
| |
| // Buffer used to mutate the data before writing out. |
| std::vector<uint8_t> buffer; |
| }; |
| std::map<uint32_t, Table> tables; |
| |
| Table* FindTable(uint32_t tag); |
| const Table* FindTable(uint32_t tag) const; |
| }; |
| |
| // Parses the font from the given data. Returns false on parsing failure or |
| // buffer overflow. The font is valid only so long the input data pointer is |
| // valid. |
| bool ReadFont(const uint8_t* data, size_t len, Font* font); |
| |
| // Returns the file size of the font. |
| size_t FontFileSize(const Font& font); |
| |
| // Writes the font into the specified dst buffer. The dst_size should be the |
| // same as returned by FontFileSize(). Returns false upon buffer overflow (which |
| // should not happen if dst_size was computed by FontFileSize()). |
| bool WriteFont(const Font& font, uint8_t* dst, size_t dst_size); |
| |
| // Returns the number of glyphs in the font. |
| // NOTE: Currently this works only for TrueType-flavored fonts, will return |
| // zero for CFF-flavored fonts. |
| int NumGlyphs(const Font& font); |
| |
| // Sets *glyph_data and *glyph_size to point to the location of the glyph data |
| // with the given index. Returns false if the glyph is not found. |
| bool GetGlyphData(const Font& font, int glyph_index, |
| const uint8_t** glyph_data, size_t* glyph_size); |
| |
| } // namespace woff2 |
| |
| #endif // BROTLI_WOFF2_FONT_H_ |