Add woff2 to src/third_party

This patch adds the woff2 library [1] which is used to decode WOFF 2.0
web font file format. It's going to replace the old version of WOFF 2.0
decoder included in third_party/ots.

[1] https://github.com/google/woff2 (revision 445f5419)

BUG=434596
TEST=trybots

Review URL: https://codereview.chromium.org/954163002

Cr-Commit-Position: refs/heads/master@{#322517}

third_party/woff2/.gitignore

+*.o
+/woff2_compress
+/woff2_decompress

third_party/woff2/BUILD.gn

+# Copyright 2015 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+source_set("woff2_dec") {
+  sources = [
+    "src/buffer.h",
+    "src/round.h",
+    "src/store_bytes.h",
+    "src/table_tags.cc",
+    "src/table_tags.h",
+    "src/woff2_common.h",
+    "src/woff2_dec.cc",
+    "src/woff2_dec.h",
+  ]
+
+  configs -= [ "//build/config/compiler:chromium_code" ]
+  configs += [ "//build/config/compiler:no_chromium_code" ]
+
+  deps = [
+    "//third_party/brotli",
+  ]
+
+  include_dirs = [
+    "src",
+    "//third_party/brotli/dec",
+  ]
+
+  # TODO(ksakamoto): http://crbug.com/167187
+  if (is_win) {
+    cflags = [ "/wd4267" ]  # Conversion from size_t to 'type'.
+  }
+}

third_party/woff2/Makefile

+OS := $(shell uname)
+
+IDIRS=-I./brotli/dec/ -I./brotli/enc/ -I./src
+
+CXX = g++
+LFLAGS =
+GFLAGS=-no-canonical-prefixes -fno-omit-frame-pointer -m64
+CXXFLAGS = -c $(IDIRS) -std=c++0x $(GFLAGS)
+
+ifeq ($(OS), Darwin)
+  CXXFLAGS += -DOS_MACOSX
+else
+  CXXFLAGS += -fno-tree-vrp
+endif
+
+SRCDIR = src
+
+OUROBJ = font.o glyph.o normalize.o table_tags.o transform.o \
+         woff2_dec.o woff2_enc.o
+
+BROTLI = brotli
+ENCOBJ = $(BROTLI)/enc/*.o
+DECOBJ = $(BROTLI)/dec/*.o
+
+OBJS = $(patsubst %, $(SRCDIR)/%, $(OUROBJ))
+EXECUTABLES=woff2_compress woff2_decompress
+
+EXE_OBJS=$(patsubst %, $(SRCDIR)/%.o, $(EXECUTABLES))
+
+all : $(OBJS) $(EXECUTABLES)
+
+$(EXECUTABLES) : $(EXE_OBJS) deps
+	$(CXX) $(LFLAGS) $(OBJS) $(ENCOBJ) $(DECOBJ) $(SRCDIR)/$@.o -o $@
+
+deps :
+	make -C $(BROTLI)/dec
+	make -C $(BROTLI)/enc
+
+clean :
+	rm -f $(OBJS) $(EXE_OBJS) $(EXECUTABLES)
+	make -C $(BROTLI)/dec clean
+	make -C $(BROTLI)/enc clean

third_party/woff2/OWNERS

+ksakamoto@chromium.org
+bashi@chromium.org

third_party/woff2/README.chromium

+Name: woff2
+URL: https://github.com/google/woff2
+Version: 445f541996fe8376f3976d35692fd2b9a6eedf2d
+License: Apache 2.0
+License File: LICENSE
+Security Critical: yes
+
+Description:
+The reference implementation of the WOFF 2.0 web font compression
+format (http://www.w3.org/TR/WOFF2/).
+
+Local Modifications:
+
+- BUILD.gn: Added.
+- woff2.gyp: Added.
+- Cherry-picked https://github.com/google/woff2/commit/0c1ec8895bce7c7b2da66ebc6e9887ef2e0c1a55.

third_party/woff2/README.md

+This is a README for the font compression reference code. There are several
+compression related modules in this repository.
+
+brotli/ contains reference code for the Brotli byte-level compression
+algorithm. Note that it is licensed under an Apache 2 license.
+
+src/ contains the C++ code for compressing and decompressing fonts.
+
+# Build & Run
+
+This document documents how to run the compression reference code. At this
+writing, the code, while it is intended to produce a bytestream that can be
+reconstructed into a working font, the reference decompression code is not
+done, and the exact format of that bytestream is subject to change.
+
+## Build
+
+On a standard Unix-style environment:
+
+```
+git clone https://github.com/google/woff2.git
+cd woff2
+git submodule init
+git submodule update
+make clean all
+```
+
+## Run
+
+```
+woff2_compress myfont.ttf
+woff2_decompress myfont.woff2
+```
+
+# References
+
+http://www.w3.org/TR/WOFF2/
+http://www.w3.org/Submission/MTX/
+
+Also please refer to documents (currently Google Docs):
+
+WOFF Ultra Condensed file format: proposals and discussion of wire format
+issues (PDF is in docs/ directory)
+
+WIFF Ultra Condensed: more discussion of results and compression techniques.
+This tool was used to prepare the data in that document.

third_party/woff2/src/buffer.h

+// 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.
+//
+// The parts of ots.h & opentype-sanitiser.h that we need, taken from the
+// https://code.google.com/p/ots/ project.
+
+#ifndef WOFF2_BUFFER_H_
+#define WOFF2_BUFFER_H_
+
+#if defined(_WIN32)
+#include <stdlib.h>
+typedef signed char int8_t;
+typedef unsigned char uint8_t;
+typedef short int16_t;
+typedef unsigned short uint16_t;
+typedef int int32_t;
+typedef unsigned int uint32_t;
+typedef __int64 int64_t;
+typedef unsigned __int64 uint64_t;
+#define ntohl(x) _byteswap_ulong (x)
+#define ntohs(x) _byteswap_ushort (x)
+#define htonl(x) _byteswap_ulong (x)
+#define htons(x) _byteswap_ushort (x)
+#else
+#include <arpa/inet.h>
+#include <stdint.h>
+#endif
+
+#include <cstdio>
+#include <cstdlib>
+#include <cstring>
+#include <limits>
+
+namespace woff2 {
+
+#if defined(_MSC_VER) || !defined(FONT_COMPRESSION_DEBUG)
+#define FONT_COMPRESSION_FAILURE() false
+#else
+#define FONT_COMPRESSION_FAILURE() \
+  util::compression::font::Failure(__FILE__, __LINE__, __PRETTY_FUNCTION__)
+inline bool Failure(const char *f, int l, const char *fn) {
+  fprintf(stderr, "ERROR at %s:%d (%s)\n", f, l, fn);
+  fflush(stderr);
+  return false;
+}
+#endif
+
+// -----------------------------------------------------------------------------
+// Buffer helper class
+//
+// This class perform some trival buffer operations while checking for
+// out-of-bounds errors. As a family they return false if anything is amiss,
+// updating the current offset otherwise.
+// -----------------------------------------------------------------------------
+class Buffer {
+ public:
+  Buffer(const uint8_t *buffer, size_t len)
+      : buffer_(buffer),
+        length_(len),
+        offset_(0) { }
+
+  bool Skip(size_t n_bytes) {
+    return Read(NULL, n_bytes);
+  }
+
+  bool Read(uint8_t *buffer, size_t n_bytes) {
+    if (n_bytes > 1024 * 1024 * 1024) {
+      return FONT_COMPRESSION_FAILURE();
+    }
+    if ((offset_ + n_bytes > length_) ||
+        (offset_ > length_ - n_bytes)) {
+      return FONT_COMPRESSION_FAILURE();
+    }
+    if (buffer) {
+      std::memcpy(buffer, buffer_ + offset_, n_bytes);
+    }
+    offset_ += n_bytes;
+    return true;
+  }
+
+  inline bool ReadU8(uint8_t *value) {
+    if (offset_ + 1 > length_) {
+      return FONT_COMPRESSION_FAILURE();
+    }
+    *value = buffer_[offset_];
+    ++offset_;
+    return true;
+  }
+
+  bool ReadU16(uint16_t *value) {
+    if (offset_ + 2 > length_) {
+      return FONT_COMPRESSION_FAILURE();
+    }
+    std::memcpy(value, buffer_ + offset_, sizeof(uint16_t));
+    *value = ntohs(*value);
+    offset_ += 2;
+    return true;
+  }
+
+  bool ReadS16(int16_t *value) {
+    return ReadU16(reinterpret_cast<uint16_t*>(value));
+  }
+
+  bool ReadU24(uint32_t *value) {
+    if (offset_ + 3 > length_) {
+      return FONT_COMPRESSION_FAILURE();
+    }
+    *value = static_cast<uint32_t>(buffer_[offset_]) << 16 |
+        static_cast<uint32_t>(buffer_[offset_ + 1]) << 8 |
+        static_cast<uint32_t>(buffer_[offset_ + 2]);
+    offset_ += 3;
+    return true;
+  }
+
+  bool ReadU32(uint32_t *value) {
+    if (offset_ + 4 > length_) {
+      return FONT_COMPRESSION_FAILURE();
+    }
+    std::memcpy(value, buffer_ + offset_, sizeof(uint32_t));
+    *value = ntohl(*value);
+    offset_ += 4;
+    return true;
+  }
+
+  bool ReadS32(int32_t *value) {
+    return ReadU32(reinterpret_cast<uint32_t*>(value));
+  }
+
+  bool ReadTag(uint32_t *value) {
+    if (offset_ + 4 > length_) {
+      return FONT_COMPRESSION_FAILURE();
+    }
+    std::memcpy(value, buffer_ + offset_, sizeof(uint32_t));
+    offset_ += 4;
+    return true;
+  }
+
+  bool ReadR64(uint64_t *value) {
+    if (offset_ + 8 > length_) {
+      return FONT_COMPRESSION_FAILURE();
+    }
+    std::memcpy(value, buffer_ + offset_, sizeof(uint64_t));
+    offset_ += 8;
+    return true;
+  }
+
+  const uint8_t *buffer() const { return buffer_; }
+  size_t offset() const { return offset_; }
+  size_t length() const { return length_; }
+
+  void set_offset(size_t newoffset) { offset_ = newoffset; }
+
+ private:
+  const uint8_t * const buffer_;
+  const size_t length_;
+  size_t offset_;
+};
+
+} // namespace woff2
+
+#endif  // WOFF2_BUFFER_H_

third_party/woff2/src/file.h

+// 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.
+//
+// File IO helpers
+
+#ifndef WOFF2_FILE_H_
+#define WOFF2_FILE_H_
+
+#include <fstream>
+#include <iterator>
+
+namespace woff2 {
+
+inline std::string GetFileContent(std::string filename) {
+  std::ifstream ifs(filename.c_str(), std::ios::binary);
+  return std::string(
+    std::istreambuf_iterator<char>(ifs.rdbuf()),
+    std::istreambuf_iterator<char>());
+}
+
+inline void SetFileContents(std::string filename, std::string content) {
+  std::ofstream ofs(filename.c_str(), std::ios::binary);
+  std::copy(content.begin(),
+            content.end(),
+            std::ostream_iterator<char>(ofs));
+}
+
+} // namespace woff2
+#endif  // WOFF2_FILE_H_

third_party/woff2/src/font.cc

+// 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.
+//
+// Font management utilities
+
+#include "./font.h"
+
+#include <algorithm>
+
+#include "./buffer.h"
+#include "./port.h"
+#include "./store_bytes.h"
+#include "./table_tags.h"
+
+namespace woff2 {
+
+Font::Table* Font::FindTable(uint32_t tag) {
+  std::map<uint32_t, Font::Table>::iterator it = tables.find(tag);
+  return it == tables.end() ? 0 : &it->second;
+}
+
+const Font::Table* Font::FindTable(uint32_t tag) const {
+  std::map<uint32_t, Font::Table>::const_iterator it = tables.find(tag);
+  return it == tables.end() ? 0 : &it->second;
+}
+
+bool ReadFont(const uint8_t* data, size_t len, Font* font) {
+  Buffer file(data, len);
+
+  // We don't care about the search_range, entry_selector and range_shift
+  // fields, they will always be computed upon writing the font.
+  if (!file.ReadU32(&font->flavor) ||
+      !file.ReadU16(&font->num_tables) ||
+      !file.Skip(6)) {
+    return FONT_COMPRESSION_FAILURE();
+  }
+
+  std::map<uint32_t, uint32_t> intervals;
+  for (uint16_t i = 0; i < font->num_tables; ++i) {
+    Font::Table table;
+    if (!file.ReadU32(&table.tag) ||
+        !file.ReadU32(&table.checksum) ||
+        !file.ReadU32(&table.offset) ||
+        !file.ReadU32(&table.length)) {
+      return FONT_COMPRESSION_FAILURE();
+    }
+    if ((table.offset & 3) != 0 ||
+        table.length > len ||
+        len - table.length < table.offset) {
+      return FONT_COMPRESSION_FAILURE();
+    }
+    intervals[table.offset] = table.length;
+    table.data = data + table.offset;
+    if (font->tables.find(table.tag) != font->tables.end()) {
+      return FONT_COMPRESSION_FAILURE();
+    }
+    font->tables[table.tag] = table;
+  }
+
+  // Check that tables are non-overlapping.
+  uint32_t last_offset = 12UL + 16UL * font->num_tables;
+  for (const auto& i : intervals) {
+    if (i.first < last_offset || i.first + i.second < i.first) {
+      return FONT_COMPRESSION_FAILURE();
+    }
+    last_offset = i.first + i.second;
+  }
+  return true;
+}
+
+size_t FontFileSize(const Font& font) {
+  size_t max_offset = 12ULL + 16ULL * font.num_tables;
+  for (const auto& i : font.tables) {
+    const Font::Table& table = i.second;
+    size_t padding_size = (4 - (table.length & 3)) & 3;
+    size_t end_offset = (padding_size + table.offset) + table.length;
+    max_offset = std::max(max_offset, end_offset);
+  }
+  return max_offset;
+}
+
+bool WriteFont(const Font& font, uint8_t* dst, size_t dst_size) {
+  if (dst_size < 12ULL + 16ULL * font.num_tables) {
+    return FONT_COMPRESSION_FAILURE();
+  }
+  size_t offset = 0;
+  StoreU32(font.flavor, &offset, dst);
+  Store16(font.num_tables, &offset, dst);
+  uint16_t max_pow2 = font.num_tables ? Log2Floor(font.num_tables) : 0;
+  uint16_t search_range = max_pow2 ? 1 << (max_pow2 + 4) : 0;
+  uint16_t range_shift = (font.num_tables << 4) - search_range;
+  Store16(search_range, &offset, dst);
+  Store16(max_pow2, &offset, dst);
+  Store16(range_shift, &offset, dst);
+  for (const auto& i : font.tables) {
+    const Font::Table& table = i.second;
+    StoreU32(table.tag, &offset, dst);
+    StoreU32(table.checksum, &offset, dst);
+    StoreU32(table.offset, &offset, dst);
+    StoreU32(table.length, &offset, dst);
+    if (table.offset + table.length < table.offset ||
+        dst_size < table.offset + table.length) {
+      return FONT_COMPRESSION_FAILURE();
+    }
+    memcpy(dst + table.offset, table.data, table.length);
+    size_t padding_size = (4 - (table.length & 3)) & 3;
+    if (table.offset + table.length + padding_size < padding_size ||
+        dst_size < table.offset + table.length + padding_size) {
+      return FONT_COMPRESSION_FAILURE();
+    }
+    memset(dst + table.offset + table.length, 0, padding_size);
+  }
+  return true;
+}
+
+int NumGlyphs(const Font& font) {
+  const Font::Table* head_table = font.FindTable(kHeadTableTag);
+  const Font::Table* loca_table = font.FindTable(kLocaTableTag);
+  if (head_table == NULL || loca_table == NULL || head_table->length < 52) {
+    return 0;
+  }
+  int index_fmt = IndexFormat(font);
+  int num_glyphs = (loca_table->length / (index_fmt == 0 ? 2 : 4)) - 1;
+  return num_glyphs;
+}
+
+int IndexFormat(const Font& font) {
+  const Font::Table* head_table = font.FindTable(kHeadTableTag);
+  if (head_table == NULL) {
+    return 0;
+  }
+  return head_table->data[51];
+}
+
+bool GetGlyphData(const Font& font, int glyph_index,
+                  const uint8_t** glyph_data, size_t* glyph_size) {
+  if (glyph_index < 0) {
+    return FONT_COMPRESSION_FAILURE();
+  }
+  const Font::Table* head_table = font.FindTable(kHeadTableTag);
+  const Font::Table* loca_table = font.FindTable(kLocaTableTag);
+  const Font::Table* glyf_table = font.FindTable(kGlyfTableTag);
+  if (head_table == NULL || loca_table == NULL || glyf_table == NULL ||
+      head_table->length < 52) {
+    return FONT_COMPRESSION_FAILURE();
+  }
+
+  int index_fmt = IndexFormat(font);
+
+  Buffer loca_buf(loca_table->data, loca_table->length);
+  if (index_fmt == 0) {
+    uint16_t offset1, offset2;
+    if (!loca_buf.Skip(2 * glyph_index) ||
+        !loca_buf.ReadU16(&offset1) ||
+        !loca_buf.ReadU16(&offset2) ||
+        offset2 < offset1 ||
+        2 * offset2 > glyf_table->length) {
+      return FONT_COMPRESSION_FAILURE();
+    }
+    *glyph_data = glyf_table->data + 2 * offset1;
+    *glyph_size = 2 * (offset2 - offset1);
+  } else {
+    uint32_t offset1, offset2;
+    if (!loca_buf.Skip(4 * glyph_index) ||
+        !loca_buf.ReadU32(&offset1) ||
+        !loca_buf.ReadU32(&offset2) ||
+        offset2 < offset1 ||
+        offset2 > glyf_table->length) {
+      return FONT_COMPRESSION_FAILURE();
+    }
+    *glyph_data = glyf_table->data + offset1;
+    *glyph_size = offset2 - offset1;
+  }
+  return true;
+}
+
+bool RemoveDigitalSignature(Font* font) {
+  std::map<uint32_t, Font::Table>::iterator it =
+      font->tables.find(kDsigTableTag);
+  if (it != font->tables.end()) {
+    font->tables.erase(it);
+    font->num_tables = font->tables.size();
+  }
+  return true;
+}
+
+} // namespace woff2

third_party/woff2/src/font.h

+// 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 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;
+  };
+  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);
+
+// 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_

third_party/woff2/src/glyph.h

+// 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 and I/O for glyph data within sfnt format files for the purpose of
+// performing the preprocessing step of the WOFF 2.0 conversion.
+
+#ifndef WOFF2_GLYPH_H_
+#define WOFF2_GLYPH_H_
+
+#include <stddef.h>
+#include <inttypes.h>
+#include <vector>
+
+namespace woff2 {
+
+// Represents a parsed simple or composite glyph. The composite glyph data and
+// instructions are un-parsed and we keep only pointers to the raw data,
+// therefore the glyph is valid only so long the data from which it was parsed
+// is around.
+class Glyph {
+ public:
+  Glyph() : instructions_size(0), composite_data_size(0) {}
+
+  // Bounding box.
+  int16_t x_min;
+  int16_t x_max;
+  int16_t y_min;
+  int16_t y_max;
+
+  // Instructions.
+  uint16_t instructions_size;
+  const uint8_t* instructions_data;
+
+  // Data model for simple glyphs.
+  struct Point {
+    int x;
+    int y;
+    bool on_curve;
+  };
+  std::vector<std::vector<Point> > contours;
+
+  // Data for composite glyphs.
+  const uint8_t* composite_data;
+  uint32_t composite_data_size;
+  bool have_instructions;
+};
+
+// Parses the glyph from the given data. Returns false on parsing failure or
+// buffer overflow. The glyph is valid only so long the input data pointer is
+// valid.
+bool ReadGlyph(const uint8_t* data, size_t len, Glyph* glyph);
+
+// Stores the glyph into the specified dst buffer. The *dst_size is the buffer
+// size on entry and is set to the actual (unpadded) stored size on exit.
+// Returns false on buffer overflow.
+bool StoreGlyph(const Glyph& glyph, uint8_t* dst, size_t* dst_size);
+
+} // namespace woff2
+
+#endif  // WOFF2_GLYPH_H_

third_party/woff2/src/normalize.cc

+// 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.
+//
+// Glyph normalization
+
+#include "./normalize.h"
+
+#include <inttypes.h>
+#include <stddef.h>
+
+#include "./buffer.h"
+#include "./port.h"
+#include "./font.h"
+#include "./glyph.h"
+#include "./round.h"
+#include "./store_bytes.h"
+#include "./table_tags.h"
+
+namespace woff2 {
+
+namespace {
+
+void StoreLoca(int index_fmt, uint32_t value, size_t* offset, uint8_t* dst) {
+  if (index_fmt == 0) {
+    Store16(value >> 1, offset, dst);
+  } else {
+    StoreU32(value, offset, dst);
+  }
+}
+
+void NormalizeSimpleGlyphBoundingBox(Glyph* glyph) {
+  if (glyph->contours.empty() || glyph->contours[0].empty()) {
+    return;
+  }
+  int16_t x_min = glyph->contours[0][0].x;
+  int16_t y_min = glyph->contours[0][0].y;
+  int16_t x_max = x_min;
+  int16_t y_max = y_min;
+  for (const auto& contour : glyph->contours) {
+    for (const auto& point : contour) {
+      if (point.x < x_min) x_min = point.x;
+      if (point.x > x_max) x_max = point.x;
+      if (point.y < y_min) y_min = point.y;
+      if (point.y > y_max) y_max = point.y;
+    }
+  }
+  glyph->x_min = x_min;
+  glyph->y_min = y_min;
+  glyph->x_max = x_max;
+  glyph->y_max = y_max;
+}
+
+}  // namespace
+
+namespace {
+
+bool WriteNormalizedLoca(int index_fmt, int num_glyphs, Font* font) {
+  Font::Table* glyf_table = font->FindTable(kGlyfTableTag);
+  Font::Table* loca_table = font->FindTable(kLocaTableTag);
+
+  int glyph_sz = index_fmt == 0 ? 2 : 4;
+  loca_table->buffer.resize(Round4(num_glyphs + 1) * glyph_sz);
+  loca_table->length = (num_glyphs + 1) * glyph_sz;
+
+  uint8_t* glyf_dst = &glyf_table->buffer[0];
+  uint8_t* loca_dst = &loca_table->buffer[0];
+  uint32_t glyf_offset = 0;
+  size_t loca_offset = 0;
+
+  for (int i = 0; i < num_glyphs; ++i) {
+    StoreLoca(index_fmt, glyf_offset, &loca_offset, loca_dst);
+    Glyph glyph;
+    const uint8_t* glyph_data;
+    size_t glyph_size;
+    if (!GetGlyphData(*font, i, &glyph_data, &glyph_size) ||
+        (glyph_size > 0 && !ReadGlyph(glyph_data, glyph_size, &glyph))) {
+      return FONT_COMPRESSION_FAILURE();
+    }
+    NormalizeSimpleGlyphBoundingBox(&glyph);
+    size_t glyf_dst_size = glyf_table->buffer.size() - glyf_offset;
+    if (!StoreGlyph(glyph, glyf_dst + glyf_offset, &glyf_dst_size)) {
+      return FONT_COMPRESSION_FAILURE();
+    }
+    glyf_dst_size = Round4(glyf_dst_size);
+    if (glyf_dst_size > std::numeric_limits<uint32_t>::max() ||
+        glyf_offset + static_cast<uint32_t>(glyf_dst_size) < glyf_offset ||
+        (index_fmt == 0 && glyf_offset + glyf_dst_size >= (1UL << 17))) {
+      return FONT_COMPRESSION_FAILURE();
+    }
+    glyf_offset += glyf_dst_size;
+  }
+  if (glyf_offset == 0) {
+    return false;
+  }
+
+  StoreLoca(index_fmt, glyf_offset, &loca_offset, loca_dst);
+
+  glyf_table->buffer.resize(glyf_offset);
+  glyf_table->data = &glyf_table->buffer[0];
+  glyf_table->length = glyf_offset;
+  loca_table->data = &loca_table->buffer[0];
+
+  return true;
+}
+
+}  // namespace
+
+namespace {
+
+bool MakeEditableBuffer(Font* font, int tableTag) {
+  Font::Table* table = font->FindTable(tableTag);
+  if (table == NULL) {
+    return FONT_COMPRESSION_FAILURE();
+  }
+  int sz = Round4(table->length);
+  table->buffer.resize(sz);
+  uint8_t* buf = &table->buffer[0];
+  memcpy(buf, table->data, sz);
+  table->data = buf;
+  return true;
+}
+
+}  // namespace
+
+bool NormalizeGlyphs(Font* font) {
+  Font::Table* cff_table = font->FindTable(kCffTableTag);
+  Font::Table* head_table = font->FindTable(kHeadTableTag);
+  Font::Table* glyf_table = font->FindTable(kGlyfTableTag);
+  Font::Table* loca_table = font->FindTable(kLocaTableTag);
+  if (head_table == NULL) {
+    return FONT_COMPRESSION_FAILURE();
+  }
+  // CFF, no loca, no glyf is OK for CFF. If so, don't normalize.
+  if (cff_table != NULL && loca_table == NULL && glyf_table == NULL) {
+    return true;
+  }
+  if (loca_table == NULL || glyf_table == NULL) {
+    return FONT_COMPRESSION_FAILURE();
+  }
+  int index_fmt = head_table->data[51];
+  int num_glyphs = NumGlyphs(*font);
+
+  // We need to allocate a bit more than its original length for the normalized
+  // glyf table, since it can happen that the glyphs in the original table are
+  // 2-byte aligned, while in the normalized table they are 4-byte aligned.
+  // That gives a maximum of 2 bytes increase per glyph. However, there is no
+  // theoretical guarantee that the total size of the flags plus the coordinates
+  // is the smallest possible in the normalized version, so we have to allow
+  // some general overhead.
+  // TODO(user) Figure out some more precise upper bound on the size of
+  // the overhead.
+  size_t max_normalized_glyf_size = 1.1 * glyf_table->length + 2 * num_glyphs;
+
+  glyf_table->buffer.resize(max_normalized_glyf_size);
+
+  // if we can't write a loca using short's (index_fmt 0)
+  // try again using longs (index_fmt 1)
+  if (!WriteNormalizedLoca(index_fmt, num_glyphs, font)) {
+    if (index_fmt != 0) {
+      return FONT_COMPRESSION_FAILURE();
+    }
+
+    // Rewrite loca with 4-byte entries & update head to match
+    index_fmt = 1;
+    if (!WriteNormalizedLoca(index_fmt, num_glyphs, font)) {
+      return FONT_COMPRESSION_FAILURE();
+    }
+    head_table->buffer[51] = 1;
+  }
+
+  return true;
+}
+
+bool NormalizeOffsets(Font* font) {
+  uint32_t offset = 12 + 16 * font->num_tables;
+  for (auto& i : font->tables) {
+    i.second.offset = offset;
+    offset += Round4(i.second.length);
+  }
+  return true;
+}
+
+namespace {
+
+uint32_t ComputeChecksum(const uint8_t* buf, size_t size) {
+  uint32_t checksum = 0;
+  for (size_t i = 0; i < size; i += 4) {
+    checksum += ((buf[i] << 24) |
+                 (buf[i + 1] << 16) |
+                 (buf[i + 2] << 8) |
+                 buf[i + 3]);
+  }
+  return checksum;
+}
+
+uint32_t ComputeHeaderChecksum(const Font& font) {
+  uint32_t checksum = font.flavor;
+  uint16_t max_pow2 = font.num_tables ? Log2Floor(font.num_tables) : 0;
+  uint16_t search_range = max_pow2 ? 1 << (max_pow2 + 4) : 0;
+  uint16_t range_shift = (font.num_tables << 4) - search_range;
+  checksum += (font.num_tables << 16 | search_range);
+  checksum += (max_pow2 << 16 | range_shift);
+  for (const auto& i : font.tables) {
+    checksum += i.second.tag;
+    checksum += i.second.checksum;
+    checksum += i.second.offset;
+    checksum += i.second.length;
+  }
+  return checksum;
+}
+
+}  // namespace
+
+bool FixChecksums(Font* font) {
+  Font::Table* head_table = font->FindTable(kHeadTableTag);
+  if (head_table == NULL || head_table->length < 12) {
+    return FONT_COMPRESSION_FAILURE();
+  }
+  uint8_t* head_buf = &head_table->buffer[0];
+  size_t offset = 8;
+  StoreU32(0, &offset, head_buf);
+  uint32_t file_checksum = 0;
+  for (auto& i : font->tables) {
+    Font::Table* table = &i.second;
+    table->checksum = ComputeChecksum(table->data, table->length);
+    file_checksum += table->checksum;
+  }
+  file_checksum += ComputeHeaderChecksum(*font);
+  offset = 8;
+  StoreU32(0xb1b0afba - file_checksum, &offset, head_buf);
+  return true;
+}
+
+bool NormalizeFont(Font* font) {
+  return (MakeEditableBuffer(font, kHeadTableTag) &&
+          RemoveDigitalSignature(font) &&
+          NormalizeGlyphs(font) &&
+          NormalizeOffsets(font) &&
+          FixChecksums(font));
+}
+
+} // namespace woff2

third_party/woff2/src/normalize.h

+// 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.
+//
+// Functions for normalizing fonts. Since the WOFF 2.0 decoder creates font
+// files in normalized form, the WOFF 2.0 conversion is guaranteed to be
+// lossless (in a bitwise sense) only for normalized font files.
+
+#ifndef WOFF2_NORMALIZE_H_
+#define WOFF2_NORMALIZE_H_
+
+namespace woff2 {
+
+struct Font;
+
+// Changes the offset fields of the table headers so that the data for the
+// tables will be written in order of increasing tag values, without any gaps
+// other than the 4-byte padding.
+bool NormalizeOffsets(Font* font);
+
+// Changes the checksum fields of the table headers and the checksum field of
+// the head table so that it matches the current data.
+bool FixChecksums(Font* font);
+
+// Parses each of the glyphs in the font and writes them again to the glyf
+// table in normalized form, as defined by the StoreGlyph() function. Changes
+// the loca table accordigly.
+bool NormalizeGlyphs(Font* font);
+
+// Performs all of the normalization steps above.
+bool NormalizeFont(Font* font);
+
+} // namespace woff2
+
+#endif  // WOFF2_NORMALIZE_H_

third_party/woff2/src/port.h

+// 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.
+//
+// Helper function for bit twiddling
+
+#ifndef WOFF2_PORT_H_
+#define WOFF2_PORT_H_
+
+namespace woff2 {
+
+typedef unsigned int       uint32;
+
+inline int Log2Floor(uint32 n) {
+#if defined(__GNUC__)
+  return n == 0 ? -1 : 31 ^ __builtin_clz(n);
+#else
+  if (n == 0)
+    return -1;
+  int log = 0;
+  uint32 value = n;
+  for (int i = 4; i >= 0; --i) {
+    int shift = (1 << i);
+    uint32 x = value >> shift;
+    if (x != 0) {
+      value = x;
+      log += shift;
+    }
+  }
+  assert(value == 1);
+  return log;
+#endif
+}
+
+} // namespace woff2
+#endif  // WOFF2_PORT_H_

third_party/woff2/src/round.h

+// 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.
+//
+// Helper for rounding
+
+#ifndef WOFF2_ROUND_H_
+#define WOFF2_ROUND_H_
+
+#include <limits>
+
+namespace woff2 {
+
+// Round a value up to the nearest multiple of 4. Don't round the value in the
+// case that rounding up overflows.
+template<typename T> T Round4(T value) {
+  if (std::numeric_limits<T>::max() - value < 3) {
+    return value;
+  }
+  return (value + 3) & ~3;
+}
+
+} // namespace woff2
+
+#endif  // WOFF2_ROUND_H_

third_party/woff2/src/store_bytes.h

+// 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.
+//
+// Helper functions for storing integer values into byte streams.
+// No bounds checking is performed, that is the responsibility of the caller.
+
+#ifndef WOFF2_STORE_BYTES_H_
+#define WOFF2_STORE_BYTES_H_
+
+#include <inttypes.h>
+#include <stddef.h>
+#include <string.h>
+
+namespace woff2 {
+
+inline size_t StoreU32(uint8_t* dst, size_t offset, uint32_t x) {
+  dst[offset] = x >> 24;
+  dst[offset + 1] = x >> 16;
+  dst[offset + 2] = x >> 8;
+  dst[offset + 3] = x;
+  return offset + 4;
+}
+
+inline size_t Store16(uint8_t* dst, size_t offset, int x) {
+  dst[offset] = x >> 8;
+  dst[offset + 1] = x;
+  return offset + 2;
+}
+
+inline void StoreU32(uint32_t val, size_t* offset, uint8_t* dst) {
+  dst[(*offset)++] = val >> 24;
+  dst[(*offset)++] = val >> 16;
+  dst[(*offset)++] = val >> 8;
+  dst[(*offset)++] = val;
+}
+
+inline void Store16(int val, size_t* offset, uint8_t* dst) {
+  dst[(*offset)++] = val >> 8;
+  dst[(*offset)++] = val;
+}
+
+inline void StoreBytes(const uint8_t* data, size_t len,
+                       size_t* offset, uint8_t* dst) {
+  memcpy(&dst[*offset], data, len);
+  *offset += len;
+}
+
+} // namespace woff2
+
+#endif  // WOFF2_STORE_BYTES_H_

third_party/woff2/src/table_tags.cc

+// Copyright 2014 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.
+//
+// Font table tags
+
+#include "./table_tags.h"
+
+namespace woff2 {
+
+// Note that the byte order is big-endian, not the same as ots.cc
+#define TAG(a, b, c, d) ((a << 24) | (b << 16) | (c << 8) | d)
+
+const uint32_t kKnownTags[63] = {
+  TAG('c', 'm', 'a', 'p'),  // 0
+  TAG('h', 'e', 'a', 'd'),  // 1
+  TAG('h', 'h', 'e', 'a'),  // 2
+  TAG('h', 'm', 't', 'x'),  // 3
+  TAG('m', 'a', 'x', 'p'),  // 4
+  TAG('n', 'a', 'm', 'e'),  // 5
+  TAG('O', 'S', '/', '2'),  // 6
+  TAG('p', 'o', 's', 't'),  // 7
+  TAG('c', 'v', 't', ' '),  // 8
+  TAG('f', 'p', 'g', 'm'),  // 9
+  TAG('g', 'l', 'y', 'f'),  // 10
+  TAG('l', 'o', 'c', 'a'),  // 11
+  TAG('p', 'r', 'e', 'p'),  // 12
+  TAG('C', 'F', 'F', ' '),  // 13
+  TAG('V', 'O', 'R', 'G'),  // 14
+  TAG('E', 'B', 'D', 'T'),  // 15
+  TAG('E', 'B', 'L', 'C'),  // 16
+  TAG('g', 'a', 's', 'p'),  // 17
+  TAG('h', 'd', 'm', 'x'),  // 18
+  TAG('k', 'e', 'r', 'n'),  // 19
+  TAG('L', 'T', 'S', 'H'),  // 20
+  TAG('P', 'C', 'L', 'T'),  // 21
+  TAG('V', 'D', 'M', 'X'),  // 22
+  TAG('v', 'h', 'e', 'a'),  // 23
+  TAG('v', 'm', 't', 'x'),  // 24
+  TAG('B', 'A', 'S', 'E'),  // 25
+  TAG('G', 'D', 'E', 'F'),  // 26
+  TAG('G', 'P', 'O', 'S'),  // 27
+  TAG('G', 'S', 'U', 'B'),  // 28
+  TAG('E', 'B', 'S', 'C'),  // 29
+  TAG('J', 'S', 'T', 'F'),  // 30
+  TAG('M', 'A', 'T', 'H'),  // 31
+  TAG('C', 'B', 'D', 'T'),  // 32
+  TAG('C', 'B', 'L', 'C'),  // 33
+  TAG('C', 'O', 'L', 'R'),  // 34
+  TAG('C', 'P', 'A', 'L'),  // 35
+  TAG('S', 'V', 'G', ' '),  // 36
+  TAG('s', 'b', 'i', 'x'),  // 37
+  TAG('a', 'c', 'n', 't'),  // 38
+  TAG('a', 'v', 'a', 'r'),  // 39
+  TAG('b', 'd', 'a', 't'),  // 40
+  TAG('b', 'l', 'o', 'c'),  // 41
+  TAG('b', 's', 'l', 'n'),  // 42
+  TAG('c', 'v', 'a', 'r'),  // 43
+  TAG('f', 'd', 's', 'c'),  // 44
+  TAG('f', 'e', 'a', 't'),  // 45
+  TAG('f', 'm', 't', 'x'),  // 46
+  TAG('f', 'v', 'a', 'r'),  // 47
+  TAG('g', 'v', 'a', 'r'),  // 48
+  TAG('h', 's', 't', 'y'),  // 49
+  TAG('j', 'u', 's', 't'),  // 50
+  TAG('l', 'c', 'a', 'r'),  // 51
+  TAG('m', 'o', 'r', 't'),  // 52
+  TAG('m', 'o', 'r', 'x'),  // 53
+  TAG('o', 'p', 'b', 'd'),  // 54
+  TAG('p', 'r', 'o', 'p'),  // 55
+  TAG('t', 'r', 'a', 'k'),  // 56
+  TAG('Z', 'a', 'p', 'f'),  // 57
+  TAG('S', 'i', 'l', 'f'),  // 58
+  TAG('G', 'l', 'a', 't'),  // 59
+  TAG('G', 'l', 'o', 'c'),  // 60
+  TAG('F', 'e', 'a', 't'),  // 61
+  TAG('S', 'i', 'l', 'l'),  // 62
+};
+
+} // namespace woff2

third_party/woff2/src/table_tags.h

+// Copyright 2014 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.
+//
+// Font table tags
+
+#ifndef WOFF2_TABLE_TAGS_H_
+#define WOFF2_TABLE_TAGS_H_
+
+#include <inttypes.h>
+
+namespace woff2 {
+
+// Tags of popular tables.
+static const uint32_t kGlyfTableTag = 0x676c7966;
+static const uint32_t kHeadTableTag = 0x68656164;
+static const uint32_t kLocaTableTag = 0x6c6f6361;
+static const uint32_t kDsigTableTag = 0x44534947;
+static const uint32_t kCffTableTag = 0x43464620;
+
+extern const uint32_t kKnownTags[];
+
+} // namespace woff2
+
+#endif  // WOFF2_TABLE_TAGS_H_

third_party/woff2/src/transform.cc

+// 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.
+//
+// Library for preprocessing fonts as part of the WOFF 2.0 conversion.
+
+#include "./transform.h"
+
+#include <complex>  // for std::abs
+
+#include "./buffer.h"
+#include "./font.h"
+#include "./glyph.h"
+#include "./table_tags.h"
+
+namespace woff2 {
+
+namespace {
+
+const int FLAG_ARG_1_AND_2_ARE_WORDS = 1 << 0;
+const int FLAG_WE_HAVE_INSTRUCTIONS = 1 << 8;
+
+void WriteBytes(std::vector<uint8_t>* out, const uint8_t* data, size_t len) {
+  if (len == 0) return;
+  size_t offset = out->size();
+  out->resize(offset + len);
+  memcpy(&(*out)[offset], data, len);
+}
+
+void WriteBytes(std::vector<uint8_t>* out, const std::vector<uint8_t>& in) {
+  for (int i = 0; i < in.size(); ++i) {
+    out->push_back(in[i]);
+  }
+}
+
+void WriteUShort(std::vector<uint8_t>* out, int value) {
+  out->push_back(value >> 8);
+  out->push_back(value & 255);
+}
+
+void WriteLong(std::vector<uint8_t>* out, int value) {
+  out->push_back((value >> 24) & 255);
+  out->push_back((value >> 16) & 255);
+  out->push_back((value >> 8) & 255);
+  out->push_back(value & 255);
+}
+
+void Write255UShort(std::vector<uint8_t>* out, int value) {
+  if (value < 253) {
+    out->push_back(value);
+  } else if (value < 506) {
+    out->push_back(255);
+    out->push_back(value - 253);
+  } else if (value < 762) {
+    out->push_back(254);
+    out->push_back(value - 506);
+  } else {
+    out->push_back(253);
+    out->push_back(value >> 8);
+    out->push_back(value & 0xff);
+  }
+}
+
+// Glyf table preprocessing, based on
+// GlyfEncoder.java
+// but only the "sbbox" and "cbbox" options are supported.
+class GlyfEncoder {
+ public:
+  explicit GlyfEncoder(int num_glyphs)
+      : sbbox_(false), cbbox_(true), n_glyphs_(num_glyphs) {
+    bbox_bitmap_.resize(((num_glyphs + 31) >> 5) << 2);
+  }
+
+  bool Encode(int glyph_id, const Glyph& glyph) {
+    if (glyph.composite_data_size > 0) {
+      WriteCompositeGlyph(glyph_id, glyph);
+    } else if (glyph.contours.size() > 0) {
+      WriteSimpleGlyph(glyph_id, glyph);
+    } else {
+      WriteUShort(&n_contour_stream_, 0);
+    }
+    return true;
+  }
+
+  void GetTransformedGlyfBytes(std::vector<uint8_t>* result) {
+    WriteLong(result, 0);  // version
+    WriteUShort(result, n_glyphs_);
+    WriteUShort(result, 0);  // index_format, will be set later
+    WriteLong(result, n_contour_stream_.size());
+    WriteLong(result, n_points_stream_.size());
+    WriteLong(result, flag_byte_stream_.size());
+    WriteLong(result, glyph_stream_.size());
+    WriteLong(result, composite_stream_.size());
+    WriteLong(result, bbox_bitmap_.size() + bbox_stream_.size());
+    WriteLong(result, instruction_stream_.size());
+    WriteBytes(result, n_contour_stream_);
+    WriteBytes(result, n_points_stream_);
+    WriteBytes(result, flag_byte_stream_);
+    WriteBytes(result, glyph_stream_);
+    WriteBytes(result, composite_stream_);
+    WriteBytes(result, bbox_bitmap_);
+    WriteBytes(result, bbox_stream_);
+    WriteBytes(result, instruction_stream_);
+  }
+
+ private:
+  void WriteInstructions(const Glyph& glyph) {
+    Write255UShort(&glyph_stream_, glyph.instructions_size);
+    WriteBytes(&instruction_stream_,
+               glyph.instructions_data, glyph.instructions_size);
+  }
+
+  void WriteSimpleGlyph(int glyph_id, const Glyph& glyph) {
+    int num_contours = glyph.contours.size();
+    WriteUShort(&n_contour_stream_, num_contours);
+    if (sbbox_) {
+      WriteBbox(glyph_id, glyph);
+    }
+    // TODO: check that bbox matches, write bbox if not
+    for (int i = 0; i < num_contours; i++) {
+      Write255UShort(&n_points_stream_, glyph.contours[i].size());
+    }
+    int lastX = 0;
+    int lastY = 0;
+    for (int i = 0; i < num_contours; i++) {
+      int num_points = glyph.contours[i].size();
+      for (int j = 0; j < num_points; j++) {
+        int x = glyph.contours[i][j].x;
+        int y = glyph.contours[i][j].y;
+        int dx = x - lastX;
+        int dy = y - lastY;
+        WriteTriplet(glyph.contours[i][j].on_curve, dx, dy);
+        lastX = x;
+        lastY = y;
+      }
+    }
+    if (num_contours > 0) {
+      WriteInstructions(glyph);
+    }
+  }
+
+  void WriteCompositeGlyph(int glyph_id, const Glyph& glyph) {
+    WriteUShort(&n_contour_stream_, -1);
+    if (cbbox_) {
+      WriteBbox(glyph_id, glyph);
+    }
+    WriteBytes(&composite_stream_,
+               glyph.composite_data,
+               glyph.composite_data_size);
+    if (glyph.have_instructions) {
+      WriteInstructions(glyph);
+    }
+  }
+
+  void WriteBbox(int glyph_id, const Glyph& glyph) {
+    bbox_bitmap_[glyph_id >> 3] |= 0x80 >> (glyph_id & 7);
+    WriteUShort(&bbox_stream_, glyph.x_min);
+    WriteUShort(&bbox_stream_, glyph.y_min);
+    WriteUShort(&bbox_stream_, glyph.x_max);
+    WriteUShort(&bbox_stream_, glyph.y_max);
+  }
+
+  void WriteTriplet(bool on_curve, int x, int y) {
+    int abs_x = std::abs(x);
+    int abs_y = std::abs(y);
+    int on_curve_bit = on_curve ? 0 : 128;
+    int x_sign_bit = (x < 0) ? 0 : 1;
+    int y_sign_bit = (y < 0) ? 0 : 1;
+    int xy_sign_bits = x_sign_bit + 2 * y_sign_bit;
+    if (x == 0 && abs_y < 1280) {
+      flag_byte_stream_.push_back(on_curve_bit +
+                                  ((abs_y & 0xf00) >> 7) + y_sign_bit);
+      glyph_stream_.push_back(abs_y & 0xff);
+    } else if (y == 0 && abs_x < 1280) {
+      flag_byte_stream_.push_back(on_curve_bit + 10 +
+                                  ((abs_x & 0xf00) >> 7) + x_sign_bit);
+      glyph_stream_.push_back(abs_x & 0xff);
+    } else if (abs_x < 65 && abs_y < 65) {
+      flag_byte_stream_.push_back(on_curve_bit + 20 +
+                                  ((abs_x - 1) & 0x30) +
+                                  (((abs_y - 1) & 0x30) >> 2) +
+                                  xy_sign_bits);
+      glyph_stream_.push_back((((abs_x - 1) & 0xf) << 4) | ((abs_y - 1) & 0xf));
+    } else if (abs_x < 769 && abs_y < 769) {
+      flag_byte_stream_.push_back(on_curve_bit + 84 +
+                                  12 * (((abs_x - 1) & 0x300) >> 8) +
+                                  (((abs_y - 1) & 0x300) >> 6) + xy_sign_bits);
+      glyph_stream_.push_back((abs_x - 1) & 0xff);
+      glyph_stream_.push_back((abs_y - 1) & 0xff);
+    } else if (abs_x < 4096 && abs_y < 4096) {
+      flag_byte_stream_.push_back(on_curve_bit + 120 + xy_sign_bits);
+      glyph_stream_.push_back(abs_x >> 4);
+      glyph_stream_.push_back(((abs_x & 0xf) << 4) | (abs_y >> 8));
+      glyph_stream_.push_back(abs_y & 0xff);
+    } else {
+      flag_byte_stream_.push_back(on_curve_bit + 124 + xy_sign_bits);
+      glyph_stream_.push_back(abs_x >> 8);
+      glyph_stream_.push_back(abs_x & 0xff);
+      glyph_stream_.push_back(abs_y >> 8);
+      glyph_stream_.push_back(abs_y & 0xff);
+    }
+  }
+
+  std::vector<uint8_t> n_contour_stream_;
+  std::vector<uint8_t> n_points_stream_;
+  std::vector<uint8_t> flag_byte_stream_;
+  std::vector<uint8_t> composite_stream_;
+  std::vector<uint8_t> bbox_bitmap_;
+  std::vector<uint8_t> bbox_stream_;
+  std::vector<uint8_t> glyph_stream_;
+  std::vector<uint8_t> instruction_stream_;
+  bool sbbox_;
+  bool cbbox_;
+  int n_glyphs_;
+};
+
+}  // namespace
+
+bool TransformGlyfAndLocaTables(Font* font) {
+  // no transform for CFF
+  if (font->FindTable(kCffTableTag) != NULL
+      && font->FindTable(kGlyfTableTag) == NULL
+      && font->FindTable(kLocaTableTag) == NULL) {
+    return true;
+  }
+  Font::Table* transformed_glyf = &font->tables[kGlyfTableTag ^ 0x80808080];
+  Font::Table* transformed_loca = &font->tables[kLocaTableTag ^ 0x80808080];
+
+  int num_glyphs = NumGlyphs(*font);
+  GlyfEncoder encoder(num_glyphs);
+  for (int i = 0; i < num_glyphs; ++i) {
+    Glyph glyph;
+    const uint8_t* glyph_data;
+    size_t glyph_size;
+    if (!GetGlyphData(*font, i, &glyph_data, &glyph_size) ||
+        (glyph_size > 0 && !ReadGlyph(glyph_data, glyph_size, &glyph))) {
+      return FONT_COMPRESSION_FAILURE();
+    }
+    encoder.Encode(i, glyph);
+  }
+  encoder.GetTransformedGlyfBytes(&transformed_glyf->buffer);
+
+  const Font::Table* head_table = font->FindTable(kHeadTableTag);
+  if (head_table == NULL || head_table->length < 52) {
+    return FONT_COMPRESSION_FAILURE();
+  }
+  transformed_glyf->buffer[7] = head_table->data[51];  // index_format
+
+  transformed_glyf->tag = kGlyfTableTag ^ 0x80808080;
+  transformed_glyf->length = transformed_glyf->buffer.size();
+  transformed_glyf->data = transformed_glyf->buffer.data();
+
+  transformed_loca->tag = kLocaTableTag ^ 0x80808080;
+  transformed_loca->length = 0;
+  transformed_loca->data = NULL;
+
+  return true;
+}
+
+} // namespace woff2

third_party/woff2/src/transform.h

+// 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.
+//
+// Library for preprocessing fonts as part of the WOFF 2.0 conversion.
+
+#ifndef WOFF2_TRANSFORM_H_
+#define WOFF2_TRANSFORM_H_
+
+#include "./font.h"
+
+namespace woff2 {
+
+// Adds the transformed versions of the glyf and loca tables to the font. The
+// transformed loca table has zero length. The tag of the transformed tables is
+// derived from the original tag by flipping the MSBs of every byte.
+bool TransformGlyfAndLocaTables(Font* font);
+
+} // namespace woff2
+
+#endif  // WOFF2_TRANSFORM_H_

third_party/woff2/src/woff2_common.h

+// Copyright 2014 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.
+//
+// Common definition for WOFF2 encoding/decoding
+
+#ifndef WOFF2_WOFF2_COMMON_H_
+#define WOFF2_WOFF2_COMMON_H_
+
+#include <inttypes.h>
+
+namespace woff2 {
+
+static const uint32_t kWoff2Signature = 0x774f4632;  // "wOF2"
+
+const unsigned int kWoff2FlagsContinueStream = 1 << 4;
+const unsigned int kWoff2FlagsTransform = 1 << 5;
+
+struct Point {
+  int x;
+  int y;
+  bool on_curve;
+};
+
+struct Table {
+  uint32_t tag;
+  uint32_t flags;
+  uint32_t src_offset;
+  uint32_t src_length;
+
+  uint32_t transform_length;
+
+  uint32_t dst_offset;
+  uint32_t dst_length;
+  const uint8_t* dst_data;
+
+  bool operator<(const Table& other) const {
+    return tag < other.tag;
+  }
+};
+
+} // namespace woff2
+
+#endif  // WOFF2_WOFF2_COMMON_H_

third_party/woff2/src/woff2_compress.cc

+// 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.
+//
+// A commandline tool for compressing ttf format files to woff2.
+
+#include <string>
+
+#include "file.h"
+#include "./woff2_enc.h"
+
+
+int main(int argc, char **argv) {
+  using std::string;
+
+  if (argc != 2) {
+    fprintf(stderr, "One argument, the input filename, must be provided.\n");
+    return 1;
+  }
+
+  string filename(argv[1]);
+  string outfilename = filename.substr(0, filename.find_last_of(".")) + ".woff2";
+  fprintf(stdout, "Processing %s => %s\n",
+    filename.c_str(), outfilename.c_str());
+  string input = woff2::GetFileContent(filename);
+
+  const uint8_t* input_data = reinterpret_cast<const uint8_t*>(input.data());
+  size_t output_size = woff2::MaxWOFF2CompressedSize(input_data, input.size());
+  string output(output_size, 0);
+  uint8_t* output_data = reinterpret_cast<uint8_t*>(&output[0]);
+
+  if (!woff2::ConvertTTFToWOFF2(input_data, input.size(),
+                                output_data, &output_size)) {
+    fprintf(stderr, "Compression failed.\n");
+    return 1;
+  }
+  output.resize(output_size);
+
+  woff2::SetFileContents(outfilename, output);
+
+  return 0;
+}

third_party/woff2/src/woff2_dec.h

+// Copyright 2014 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.
+//
+// Library for converting WOFF2 format font files to their TTF versions.
+
+#ifndef WOFF2_WOFF2_DEC_H_
+#define WOFF2_WOFF2_DEC_H_
+
+#include <stddef.h>
+#include <inttypes.h>
+
+namespace woff2 {
+
+// Compute the size of the final uncompressed font, or 0 on error.
+size_t ComputeWOFF2FinalSize(const uint8_t *data, size_t length);
+
+// Decompresses the font into the target buffer. The result_length should
+// be the same as determined by ComputeFinalSize(). Returns true on successful
+// decompression.
+bool ConvertWOFF2ToTTF(uint8_t *result, size_t result_length,
+                       const uint8_t *data, size_t length);
+
+} // namespace woff2
+
+#endif  // WOFF2_WOFF2_DEC_H_

third_party/woff2/src/woff2_decompress.cc

+// 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.
+//
+// A very simple commandline tool for decompressing woff2 format files to true
+// type font files.
+
+#include <string>
+
+
+#include "file.h"
+#include "./woff2_dec.h"
+
+int main(int argc, char **argv) {
+  using std::string;
+
+  if (argc != 2) {
+    fprintf(stderr, "One argument, the input filename, must be provided.\n");
+    return 1;
+  }
+
+  string filename(argv[1]);
+  string outfilename = filename.substr(0, filename.find_last_of(".")) + ".ttf";
+  fprintf(stdout, "Processing %s => %s\n",
+    filename.c_str(), outfilename.c_str());
+  string input = woff2::GetFileContent(filename);
+
+  size_t decompressed_size = woff2::ComputeWOFF2FinalSize(
+      reinterpret_cast<const uint8_t*>(input.data()), input.size());
+  string output(decompressed_size, 0);
+  const bool ok = woff2::ConvertWOFF2ToTTF(
+      reinterpret_cast<uint8_t*>(&output[0]), decompressed_size,
+      reinterpret_cast<const uint8_t*>(input.data()), input.size());
+
+  if (!ok) {
+    fprintf(stderr, "Decompression failed\n");
+    return 1;
+  }
+
+  woff2::SetFileContents(outfilename, output);
+
+  return 0;
+}
+

third_party/woff2/src/woff2_enc.h

+// Copyright 2014 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.
+//
+// Library for converting WOFF2 format font files to their TTF versions.
+
+#ifndef WOFF2_WOFF2_ENC_H_
+#define WOFF2_WOFF2_ENC_H_
+
+#include <stddef.h>
+#include <inttypes.h>
+#include <string>
+
+using std::string;
+
+
+namespace woff2 {
+
+// Returns an upper bound on the size of the compressed file.
+size_t MaxWOFF2CompressedSize(const uint8_t* data, size_t length);
+size_t MaxWOFF2CompressedSize(const uint8_t* data, size_t length,
+                              const string& extended_metadata);
+
+// Compresses the font into the target buffer. *result_length should be at least
+// the value returned by MaxWOFF2CompressedSize(), upon return, it is set to the
+// actual compressed size. Returns true on successful compression.
+bool ConvertTTFToWOFF2(const uint8_t *data, size_t length,
+                       uint8_t *result, size_t *result_length);
+
+bool ConvertTTFToWOFF2(const uint8_t *data, size_t length,
+                       uint8_t *result, size_t *result_length,
+                       const string& extended_metadata);
+
+} // namespace woff2
+
+#endif  // WOFF2_WOFF2_ENC_H_

third_party/woff2/woff2.gyp

+# Copyright 2015 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+{
+  'targets': [
+    {
+      'target_name': 'woff2_dec',
+      'type': 'static_library',
+      'include_dirs': [
+        'src',
+        '<(DEPTH)/third_party/brotli/dec',
+      ],
+      'dependencies': [
+        '<(DEPTH)/third_party/brotli/brotli.gyp:brotli',
+      ],
+      'sources': [
+        'src/buffer.h',
+        'src/round.h',
+        'src/store_bytes.h',
+        'src/table_tags.cc',
+        'src/table_tags.h',
+        'src/woff2_common.h',
+        'src/woff2_dec.cc',
+        'src/woff2_dec.h',
+      ],
+      # TODO(ksakamoto): http://crbug.com/167187
+      'msvs_disabled_warnings': [
+        4267,
+      ],
+    },
+  ],
+}