1// Copyright 2013 Google Inc. All Rights Reserved. 2// 3// Licensed under the Apache License, Version 2.0 (the "License"); 4// you may not use this file except in compliance with the License. 5// You may obtain a copy of the License at 6// 7// http://www.apache.org/licenses/LICENSE-2.0 8// 9// Unless required by applicable law or agreed to in writing, software 10// distributed under the License is distributed on an "AS IS" BASIS, 11// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12// See the License for the specific language governing permissions and 13// limitations under the License. 14// 15// Data model for a font file in sfnt format, reading and writing functions and 16// accessors for the glyph data. 17 18#ifndef WOFF2_FONT_H_ 19#define WOFF2_FONT_H_ 20 21#include <stddef.h> 22#include <inttypes.h> 23#include <map> 24#include <vector> 25 26namespace woff2 { 27 28// Represents an sfnt font file. Only the table directory is parsed, for the 29// table data we only store a raw pointer, therefore a font object is valid only 30// as long the data from which it was parsed is around. 31struct Font { 32 uint32_t flavor; 33 uint16_t num_tables; 34 35 struct Table { 36 uint32_t tag; 37 uint32_t checksum; 38 uint32_t offset; 39 uint32_t length; 40 const uint8_t* data; 41 42 // Buffer used to mutate the data before writing out. 43 std::vector<uint8_t> buffer; 44 }; 45 std::map<uint32_t, Table> tables; 46 47 Table* FindTable(uint32_t tag); 48 const Table* FindTable(uint32_t tag) const; 49}; 50 51// Parses the font from the given data. Returns false on parsing failure or 52// buffer overflow. The font is valid only so long the input data pointer is 53// valid. 54bool ReadFont(const uint8_t* data, size_t len, Font* font); 55 56// Returns the file size of the font. 57size_t FontFileSize(const Font& font); 58 59// Writes the font into the specified dst buffer. The dst_size should be the 60// same as returned by FontFileSize(). Returns false upon buffer overflow (which 61// should not happen if dst_size was computed by FontFileSize()). 62bool WriteFont(const Font& font, uint8_t* dst, size_t dst_size); 63 64// Returns the number of glyphs in the font. 65// NOTE: Currently this works only for TrueType-flavored fonts, will return 66// zero for CFF-flavored fonts. 67int NumGlyphs(const Font& font); 68 69// Sets *glyph_data and *glyph_size to point to the location of the glyph data 70// with the given index. Returns false if the glyph is not found. 71bool GetGlyphData(const Font& font, int glyph_index, 72 const uint8_t** glyph_data, size_t* glyph_size); 73 74// Removes the digital signature (DSIG) table 75bool RemoveDigitalSignature(Font* font); 76 77} // namespace woff2 78 79#endif // WOFF2_FONT_H_ 80