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- /* Copyright 2013 Google Inc. All Rights Reserved.
- Distributed under MIT license.
- See file LICENSE for detail or copy at https://opensource.org/licenses/MIT
- */
- /* Data model for a font file in sfnt format, reading and writing functions and
- accessors for the glyph data. */
- #ifndef WOFF2_FONT_H_
- #define WOFF2_FONT_H_
- #include <stddef.h>
- #include <inttypes.h>
- #include <map>
- #include <vector>
- namespace woff2 {
- // 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;
- // If we've seen this tag/offset before, pointer to the first time we saw it
- // If this is the first time we've seen this table, NULL
- // Intended use is to bypass re-processing tables
- Font::Table* reuse_of;
- uint8_t flag_byte;
- // Is this table reused by a TTC
- bool IsReused() const;
- };
- std::map<uint32_t, Table> tables;
- std::vector<uint32_t> OutputOrderedTags() const;
- Table* FindTable(uint32_t tag);
- const Table* FindTable(uint32_t tag) const;
- };
- // Accomodates both singular (OTF, TTF) and collection (TTC) fonts
- struct FontCollection {
- uint32_t flavor;
- uint32_t header_version;
- // (offset, first use of table*) pairs
- std::map<uint32_t, Font::Table*> tables;
- std::vector<Font> fonts;
- };
- // 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. Does NOT support collections.
- bool ReadFont(const uint8_t* data, size_t len, Font* font);
- // 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. Supports collections.
- bool ReadFontCollection(const uint8_t* data, size_t len, FontCollection* fonts);
- // Returns the file size of the font.
- size_t FontFileSize(const Font& font);
- size_t FontCollectionFileSize(const FontCollection& 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);
- // Write the font at a specific offset
- bool WriteFont(const Font& font, size_t* offset, uint8_t* dst, size_t dst_size);
- bool WriteFontCollection(const FontCollection& font_collection, 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);
- // Returns the index format of the font
- int IndexFormat(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);
- // Removes the digital signature (DSIG) table
- bool RemoveDigitalSignature(Font* font);
- } // namespace woff2
- #endif // WOFF2_FONT_H_
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