Adding upstream version 115.7.0esr.upstream/115.7.0esrupstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 105 insertions, 0 deletions

diff --git a/modules/woff2/src/font.h b/modules/woff2/src/font.h
new file mode 100644
index 0000000000..7b8ddddc5a
--- /dev/null
+++ b/modules/woff2/src/font.h
@@ -0,0 +1,105 @@
+/* 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_