Adding upstream version 115.7.0esr.upstream/115.7.0esrupstream

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

27 files changed, 4690 insertions, 0 deletions

diff --git a/modules/woff2/src/buffer.h b/modules/woff2/src/buffer.h
new file mode 100644
index 0000000000..7240e5181c
--- /dev/null
+++ b/modules/woff2/src/buffer.h
@@ -0,0 +1,164 @@
+/* Copyright 2013 Google Inc. All Rights Reserved.
+
+   Distributed under MIT license.
+   See file LICENSE for detail or copy at https://opensource.org/licenses/MIT
+*/
+
+/* 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() \
+  woff2::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 *data, size_t len)
+      : buffer_(data),
+        length_(len),
+        offset_(0) { }
+
+  bool Skip(size_t n_bytes) {
+    return Read(NULL, n_bytes);
+  }
+
+  bool Read(uint8_t *data, 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 (data) {
+      std::memcpy(data, 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_
diff --git a/modules/woff2/src/convert_woff2ttf_fuzzer.cc b/modules/woff2/src/convert_woff2ttf_fuzzer.cc
new file mode 100644
index 0000000000..2d977a3ef2
--- /dev/null
+++ b/modules/woff2/src/convert_woff2ttf_fuzzer.cc
@@ -0,0 +1,13 @@
+#include <stddef.h>
+#include <stdint.h>
+
+#include <woff2/decode.h>
+
+// Entry point for LibFuzzer.
+extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
+  std::string buf;
+  woff2::WOFF2StringOut out(&buf);
+  out.SetMaxSize(30 * 1024 * 1024);
+  woff2::ConvertWOFF2ToTTF(data, size, &out);
+  return 0;
+}
diff --git a/modules/woff2/src/convert_woff2ttf_fuzzer_new_entry.cc b/modules/woff2/src/convert_woff2ttf_fuzzer_new_entry.cc
new file mode 100644
index 0000000000..5ad93364bf
--- /dev/null
+++ b/modules/woff2/src/convert_woff2ttf_fuzzer_new_entry.cc
@@ -0,0 +1,12 @@
+#include <string>
+#include <woff2/decode.h>
+
+extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t data_size) {
+  // Decode using newer entry pattern.
+  // Same pattern as woff2_decompress.
+  std::string output(std::min(woff2::ComputeWOFF2FinalSize(data, data_size),
+                              woff2::kDefaultMaxSize), 0);
+  woff2::WOFF2StringOut out(&output);
+  woff2::ConvertWOFF2ToTTF(data, data_size, &out);
+  return 0;
+}
diff --git a/modules/woff2/src/file.h b/modules/woff2/src/file.h
new file mode 100644
index 0000000000..70ea7a7fb1
--- /dev/null
+++ b/modules/woff2/src/file.h
@@ -0,0 +1,30 @@
+/* Copyright 2013 Google Inc. All Rights Reserved.
+
+   Distributed under MIT license.
+   See file LICENSE for detail or copy at https://opensource.org/licenses/MIT
+*/
+
+/* 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::iterator start,
+                            std::string::iterator end) {
+  std::ofstream ofs(filename.c_str(), std::ios::binary);
+  std::copy(start, end, std::ostream_iterator<char>(ofs));
+}
+
+} // namespace woff2
+#endif  // WOFF2_FILE_H_
diff --git a/modules/woff2/src/font.cc b/modules/woff2/src/font.cc
new file mode 100644
index 0000000000..a45153e9cb
--- /dev/null
+++ b/modules/woff2/src/font.cc
@@ -0,0 +1,400 @@
+/* Copyright 2013 Google Inc. All Rights Reserved.
+
+   Distributed under MIT license.
+   See file LICENSE for detail or copy at https://opensource.org/licenses/MIT
+*/
+
+/* Font management utilities */
+
+#include "./font.h"
+
+#include <algorithm>
+
+#include "./buffer.h"
+#include "./port.h"
+#include "./store_bytes.h"
+#include "./table_tags.h"
+#include "./woff2_common.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;
+}
+
+std::vector<uint32_t> Font::OutputOrderedTags() const {
+  std::vector<uint32_t> output_order;
+
+  for (const auto& i : tables) {
+    const Font::Table& table = i.second;
+    // This is a transformed table, we will write it together with the
+    // original version.
+    if (table.tag & 0x80808080) {
+      continue;
+    }
+    output_order.push_back(table.tag);
+  }
+
+  // Alphabetize then put loca immediately after glyf
+  auto glyf_loc = std::find(output_order.begin(), output_order.end(),
+      kGlyfTableTag);
+  auto loca_loc = std::find(output_order.begin(), output_order.end(),
+      kLocaTableTag);
+  if (glyf_loc != output_order.end() && loca_loc != output_order.end()) {
+    output_order.erase(loca_loc);
+    output_order.insert(std::find(output_order.begin(), output_order.end(),
+      kGlyfTableTag) + 1, kLocaTableTag);
+  }
+
+  return output_order;
+}
+
+bool ReadTrueTypeFont(Buffer* file, const uint8_t* data, size_t len,
+                      Font* font) {
+  // 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->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;
+    table.flag_byte = 0;
+    table.reuse_of = NULL;
+    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;
+  }
+
+  // Sanity check key tables
+  const Font::Table* head_table = font->FindTable(kHeadTableTag);
+  if (head_table != NULL && head_table->length < 52) {
+    return FONT_COMPRESSION_FAILURE();
+  }
+
+  return true;
+}
+
+bool ReadCollectionFont(Buffer* file, const uint8_t* data, size_t len,
+                        Font* font,
+                        std::map<uint32_t, Font::Table*>* all_tables) {
+  if (!file->ReadU32(&font->flavor)) {
+    return FONT_COMPRESSION_FAILURE();
+  }
+  if (!ReadTrueTypeFont(file, data, len, font)) {
+    return FONT_COMPRESSION_FAILURE();
+  }
+
+  for (auto& entry : font->tables) {
+    Font::Table& table = entry.second;
+
+    if (all_tables->find(table.offset) == all_tables->end()) {
+      (*all_tables)[table.offset] = font->FindTable(table.tag);
+    } else {
+      table.reuse_of = (*all_tables)[table.offset];
+      if (table.tag != table.reuse_of->tag) {
+        return FONT_COMPRESSION_FAILURE();
+      }
+    }
+
+  }
+  return true;
+}
+
+bool ReadTrueTypeCollection(Buffer* file, const uint8_t* data, size_t len,
+                            FontCollection* font_collection) {
+    uint32_t num_fonts;
+
+    if (!file->ReadU32(&font_collection->header_version) ||
+        !file->ReadU32(&num_fonts)) {
+      return FONT_COMPRESSION_FAILURE();
+    }
+
+    std::vector<uint32_t> offsets;
+    for (size_t i = 0; i < num_fonts; i++) {
+      uint32_t offset;
+      if (!file->ReadU32(&offset)) {
+        return FONT_COMPRESSION_FAILURE();
+      }
+      offsets.push_back(offset);
+    }
+
+    font_collection->fonts.resize(offsets.size());
+    std::vector<Font>::iterator font_it = font_collection->fonts.begin();
+
+    std::map<uint32_t, Font::Table*> all_tables;
+    for (const auto offset : offsets) {
+      file->set_offset(offset);
+      Font& font = *font_it++;
+      if (!ReadCollectionFont(file, data, len, &font, &all_tables)) {
+        return FONT_COMPRESSION_FAILURE();
+      }
+    }
+
+    return true;
+}
+
+bool ReadFont(const uint8_t* data, size_t len, Font* font) {
+  Buffer file(data, len);
+
+  if (!file.ReadU32(&font->flavor)) {
+    return FONT_COMPRESSION_FAILURE();
+  }
+
+  if (font->flavor == kTtcFontFlavor) {
+    return FONT_COMPRESSION_FAILURE();
+  }
+  return ReadTrueTypeFont(&file, data, len, font);
+}
+
+bool ReadFontCollection(const uint8_t* data, size_t len,
+                        FontCollection* font_collection) {
+  Buffer file(data, len);
+
+  if (!file.ReadU32(&font_collection->flavor)) {
+    return FONT_COMPRESSION_FAILURE();
+  }
+
+  if (font_collection->flavor != kTtcFontFlavor) {
+    font_collection->fonts.resize(1);
+    Font& font = font_collection->fonts[0];
+    font.flavor = font_collection->flavor;
+    return ReadTrueTypeFont(&file, data, len, &font);
+  }
+  return ReadTrueTypeCollection(&file, data, len, font_collection);
+}
+
+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;
+}
+
+size_t FontCollectionFileSize(const FontCollection& font_collection) {
+  size_t max_offset = 0;
+  for (auto& font : font_collection.fonts) {
+    // font file size actually just finds max offset
+    max_offset = std::max(max_offset, FontFileSize(font));
+  }
+  return max_offset;
+}
+
+bool WriteFont(const Font& font, uint8_t* dst, size_t dst_size) {
+  size_t offset = 0;
+  return WriteFont(font, &offset, dst, dst_size);
+}
+
+bool WriteTableRecord(const Font::Table* table, size_t* offset, uint8_t* dst,
+                      size_t dst_size) {
+  if (dst_size < *offset + kSfntEntrySize) {
+    return FONT_COMPRESSION_FAILURE();
+  }
+  if (table->IsReused()) {
+    table = table->reuse_of;
+  }
+  StoreU32(table->tag, offset, dst);
+  StoreU32(table->checksum, offset, dst);
+  StoreU32(table->offset, offset, dst);
+  StoreU32(table->length, offset, dst);
+  return true;
+}
+
+bool WriteTable(const Font::Table& table, size_t* offset, uint8_t* dst,
+                size_t dst_size) {
+  if (!WriteTableRecord(&table, offset, dst, dst_size)) {
+    return false;
+  }
+
+  // Write the actual table data if it's the first time we've seen it
+  if (!table.IsReused()) {
+    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;
+}
+
+bool WriteFont(const Font& font, size_t* offset, uint8_t* dst,
+               size_t dst_size) {
+  if (dst_size < 12ULL + 16ULL * font.num_tables) {
+    return FONT_COMPRESSION_FAILURE();
+  }
+  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) {
+    if (!WriteTable(i.second, offset, dst, dst_size)) {
+      return false;
+    }
+  }
+
+  return true;
+}
+
+bool WriteFontCollection(const FontCollection& font_collection, uint8_t* dst,
+                         size_t dst_size) {
+  size_t offset = 0;
+
+  // It's simpler if this just a simple sfnt
+  if (font_collection.flavor != kTtcFontFlavor) {
+    return WriteFont(font_collection.fonts[0], &offset, dst, dst_size);
+  }
+
+  // Write TTC header
+  StoreU32(kTtcFontFlavor, &offset, dst);
+  StoreU32(font_collection.header_version, &offset, dst);
+  StoreU32(font_collection.fonts.size(), &offset, dst);
+
+  // Offset Table, zeroed for now
+  size_t offset_table = offset;  // where to write offsets later
+  for (size_t i = 0; i < font_collection.fonts.size(); i++) {
+    StoreU32(0, &offset, dst);
+  }
+
+  if (font_collection.header_version == 0x00020000) {
+    StoreU32(0, &offset, dst);  // ulDsigTag
+    StoreU32(0, &offset, dst);  // ulDsigLength
+    StoreU32(0, &offset, dst);  // ulDsigOffset
+  }
+
+  // Write fonts and their offsets.
+  for (size_t i = 0; i < font_collection.fonts.size(); i++) {
+    const auto& font = font_collection.fonts[i];
+    StoreU32(offset, &offset_table, dst);
+    if (!WriteFont(font, &offset, dst, dst_size)) {
+      return false;
+    }
+  }
+
+  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 loca_record_size = (index_fmt == 0 ? 2 : 4);
+  if (loca_table->length < loca_record_size) {
+    return 0;
+  }
+  return (loca_table->length / loca_record_size) - 1;
+}
+
+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 Font::Table::IsReused() const {
+  return this->reuse_of != NULL;
+}
+
+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
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_
diff --git a/modules/woff2/src/glyph.cc b/modules/woff2/src/glyph.cc
new file mode 100644
index 0000000000..5b4948679c
--- /dev/null
+++ b/modules/woff2/src/glyph.cc
@@ -0,0 +1,383 @@
+/* Copyright 2013 Google Inc. All Rights Reserved.
+
+   Distributed under MIT license.
+   See file LICENSE for detail or copy at https://opensource.org/licenses/MIT
+*/
+
+/* Glyph manipulation */
+
+#include "./glyph.h"
+
+#include <stdlib.h>
+#include <limits>
+#include "./buffer.h"
+#include "./store_bytes.h"
+
+namespace woff2 {
+
+static const int32_t kFLAG_ONCURVE = 1;
+static const int32_t kFLAG_XSHORT = 1 << 1;
+static const int32_t kFLAG_YSHORT = 1 << 2;
+static const int32_t kFLAG_REPEAT = 1 << 3;
+static const int32_t kFLAG_XREPEATSIGN = 1 << 4;
+static const int32_t kFLAG_YREPEATSIGN = 1 << 5;
+static const int32_t kFLAG_OVERLAP_SIMPLE = 1 << 6;
+static const int32_t kFLAG_ARG_1_AND_2_ARE_WORDS = 1 << 0;
+static const int32_t kFLAG_WE_HAVE_A_SCALE = 1 << 3;
+static const int32_t kFLAG_MORE_COMPONENTS = 1 << 5;
+static const int32_t kFLAG_WE_HAVE_AN_X_AND_Y_SCALE = 1 << 6;
+static const int32_t kFLAG_WE_HAVE_A_TWO_BY_TWO = 1 << 7;
+static const int32_t kFLAG_WE_HAVE_INSTRUCTIONS = 1 << 8;
+
+bool ReadCompositeGlyphData(Buffer* buffer, Glyph* glyph) {
+  glyph->have_instructions = false;
+  glyph->composite_data = buffer->buffer() + buffer->offset();
+  size_t start_offset = buffer->offset();
+  uint16_t flags = kFLAG_MORE_COMPONENTS;
+  while (flags & kFLAG_MORE_COMPONENTS) {
+    if (!buffer->ReadU16(&flags)) {
+      return FONT_COMPRESSION_FAILURE();
+    }
+    glyph->have_instructions |= (flags & kFLAG_WE_HAVE_INSTRUCTIONS) != 0;
+    size_t arg_size = 2;  // glyph index
+    if (flags & kFLAG_ARG_1_AND_2_ARE_WORDS) {
+      arg_size += 4;
+    } else {
+      arg_size += 2;
+    }
+    if (flags & kFLAG_WE_HAVE_A_SCALE) {
+      arg_size += 2;
+    } else if (flags & kFLAG_WE_HAVE_AN_X_AND_Y_SCALE) {
+      arg_size += 4;
+    } else if (flags & kFLAG_WE_HAVE_A_TWO_BY_TWO) {
+      arg_size += 8;
+    }
+    if (!buffer->Skip(arg_size)) {
+      return FONT_COMPRESSION_FAILURE();
+    }
+  }
+  if (buffer->offset() - start_offset > std::numeric_limits<uint32_t>::max()) {
+    return FONT_COMPRESSION_FAILURE();
+  }
+  glyph->composite_data_size = buffer->offset() - start_offset;
+  return true;
+}
+
+bool ReadGlyph(const uint8_t* data, size_t len, Glyph* glyph) {
+  Buffer buffer(data, len);
+
+  int16_t num_contours;
+  if (!buffer.ReadS16(&num_contours)) {
+    return FONT_COMPRESSION_FAILURE();
+  }
+
+  // Read the bounding box.
+  if (!buffer.ReadS16(&glyph->x_min) ||
+      !buffer.ReadS16(&glyph->y_min) ||
+      !buffer.ReadS16(&glyph->x_max) ||
+      !buffer.ReadS16(&glyph->y_max)) {
+    return FONT_COMPRESSION_FAILURE();
+  }
+
+  if (num_contours == 0) {
+    // Empty glyph.
+    return true;
+  }
+
+  if (num_contours > 0) {
+    // Simple glyph.
+    glyph->contours.resize(num_contours);
+
+    // Read the number of points per contour.
+    uint16_t last_point_index = 0;
+    for (int i = 0; i < num_contours; ++i) {
+      uint16_t point_index;
+      if (!buffer.ReadU16(&point_index)) {
+        return FONT_COMPRESSION_FAILURE();
+      }
+      uint16_t num_points = point_index - last_point_index + (i == 0 ? 1 : 0);
+      glyph->contours[i].resize(num_points);
+      last_point_index = point_index;
+    }
+
+    // Read the instructions.
+    if (!buffer.ReadU16(&glyph->instructions_size)) {
+      return FONT_COMPRESSION_FAILURE();
+    }
+    glyph->instructions_data = data + buffer.offset();
+    if (!buffer.Skip(glyph->instructions_size)) {
+      return FONT_COMPRESSION_FAILURE();
+    }
+
+    // Read the run-length coded flags.
+    std::vector<std::vector<uint8_t> > flags(num_contours);
+    {
+      uint8_t flag = 0;
+      uint8_t flag_repeat = 0;
+      for (int i = 0; i < num_contours; ++i) {
+        flags[i].resize(glyph->contours[i].size());
+        for (size_t j = 0; j < glyph->contours[i].size(); ++j) {
+          if (flag_repeat == 0) {
+            if (!buffer.ReadU8(&flag)) {
+              return FONT_COMPRESSION_FAILURE();
+            }
+            if (flag & kFLAG_REPEAT) {
+              if (!buffer.ReadU8(&flag_repeat)) {
+                return FONT_COMPRESSION_FAILURE();
+              }
+            }
+          } else {
+            flag_repeat--;
+          }
+          flags[i][j] = flag;
+          glyph->contours[i][j].on_curve = flag & kFLAG_ONCURVE;
+        }
+      }
+    }
+
+    if (!flags.empty() && !flags[0].empty()) {
+      glyph->overlap_simple_flag_set = (flags[0][0] & kFLAG_OVERLAP_SIMPLE);
+    }
+
+    // Read the x coordinates.
+    int prev_x = 0;
+    for (int i = 0; i < num_contours; ++i) {
+      for (size_t j = 0; j < glyph->contours[i].size(); ++j) {
+        uint8_t flag = flags[i][j];
+        if (flag & kFLAG_XSHORT) {
+          // single byte x-delta coord value
+          uint8_t x_delta;
+          if (!buffer.ReadU8(&x_delta)) {
+            return FONT_COMPRESSION_FAILURE();
+          }
+          int sign = (flag & kFLAG_XREPEATSIGN) ? 1 : -1;
+          glyph->contours[i][j].x = prev_x + sign * x_delta;
+        } else {
+          // double byte x-delta coord value
+          int16_t x_delta = 0;
+          if (!(flag & kFLAG_XREPEATSIGN)) {
+            if (!buffer.ReadS16(&x_delta)) {
+              return FONT_COMPRESSION_FAILURE();
+            }
+          }
+          glyph->contours[i][j].x = prev_x + x_delta;
+        }
+        prev_x = glyph->contours[i][j].x;
+      }
+    }
+
+    // Read the y coordinates.
+    int prev_y = 0;
+    for (int i = 0; i < num_contours; ++i) {
+      for (size_t j = 0; j < glyph->contours[i].size(); ++j) {
+        uint8_t flag = flags[i][j];
+        if (flag & kFLAG_YSHORT) {
+          // single byte y-delta coord value
+          uint8_t y_delta;
+          if (!buffer.ReadU8(&y_delta)) {
+            return FONT_COMPRESSION_FAILURE();
+          }
+          int sign = (flag & kFLAG_YREPEATSIGN) ? 1 : -1;
+          glyph->contours[i][j].y = prev_y + sign * y_delta;
+        } else {
+          // double byte y-delta coord value
+          int16_t y_delta = 0;
+          if (!(flag & kFLAG_YREPEATSIGN)) {
+            if (!buffer.ReadS16(&y_delta)) {
+              return FONT_COMPRESSION_FAILURE();
+            }
+          }
+          glyph->contours[i][j].y = prev_y + y_delta;
+        }
+        prev_y = glyph->contours[i][j].y;
+      }
+    }
+  } else if (num_contours == -1) {
+    // Composite glyph.
+    if (!ReadCompositeGlyphData(&buffer, glyph)) {
+      return FONT_COMPRESSION_FAILURE();
+    }
+    // Read the instructions.
+    if (glyph->have_instructions) {
+      if (!buffer.ReadU16(&glyph->instructions_size)) {
+        return FONT_COMPRESSION_FAILURE();
+      }
+      glyph->instructions_data = data + buffer.offset();
+      if (!buffer.Skip(glyph->instructions_size)) {
+        return FONT_COMPRESSION_FAILURE();
+      }
+    } else {
+      glyph->instructions_size = 0;
+    }
+  } else {
+    return FONT_COMPRESSION_FAILURE();
+  }
+  return true;
+}
+
+namespace {
+
+void StoreBbox(const Glyph& glyph, size_t* offset, uint8_t* dst) {
+  Store16(glyph.x_min, offset, dst);
+  Store16(glyph.y_min, offset, dst);
+  Store16(glyph.x_max, offset, dst);
+  Store16(glyph.y_max, offset, dst);
+}
+
+void StoreInstructions(const Glyph& glyph, size_t* offset, uint8_t* dst) {
+  Store16(glyph.instructions_size, offset, dst);
+  StoreBytes(glyph.instructions_data, glyph.instructions_size, offset, dst);
+}
+
+bool StoreEndPtsOfContours(const Glyph& glyph, size_t* offset, uint8_t* dst) {
+  int end_point = -1;
+  for (const auto& contour : glyph.contours) {
+    end_point += contour.size();
+    if (contour.size() > std::numeric_limits<uint16_t>::max() ||
+        end_point > std::numeric_limits<uint16_t>::max()) {
+      return FONT_COMPRESSION_FAILURE();
+    }
+    Store16(end_point, offset, dst);
+  }
+  return true;
+}
+
+bool StorePoints(const Glyph& glyph, size_t* offset,
+                 uint8_t* dst, size_t dst_size) {
+  int previous_flag = -1;
+  int repeat_count = 0;
+  int last_x = 0;
+  int last_y = 0;
+  size_t x_bytes = 0;
+  size_t y_bytes = 0;
+
+  // Store the flags and calculate the total size of the x and y coordinates.
+  for (const auto& contour : glyph.contours) {
+    for (const auto& point : contour) {
+      int flag = point.on_curve ? kFLAG_ONCURVE : 0;
+      if (previous_flag == -1 && glyph.overlap_simple_flag_set) {
+        // First flag needs to have overlap simple bit set.
+        flag = flag | kFLAG_OVERLAP_SIMPLE;
+      }
+      int dx = point.x - last_x;
+      int dy = point.y - last_y;
+      if (dx == 0) {
+        flag |= kFLAG_XREPEATSIGN;
+      } else if (dx > -256 && dx < 256) {
+        flag |= kFLAG_XSHORT | (dx > 0 ? kFLAG_XREPEATSIGN : 0);
+        x_bytes += 1;
+      } else {
+        x_bytes += 2;
+      }
+      if (dy == 0) {
+        flag |= kFLAG_YREPEATSIGN;
+      } else if (dy > -256 && dy < 256) {
+        flag |= kFLAG_YSHORT | (dy > 0 ? kFLAG_YREPEATSIGN : 0);
+        y_bytes += 1;
+      } else {
+        y_bytes += 2;
+      }
+      if (flag == previous_flag && repeat_count != 255) {
+        dst[*offset - 1] |= kFLAG_REPEAT;
+        repeat_count++;
+      } else {
+        if (repeat_count != 0) {
+          if (*offset >= dst_size) {
+            return FONT_COMPRESSION_FAILURE();
+          }
+          dst[(*offset)++] = repeat_count;
+        }
+        if (*offset >= dst_size) {
+          return FONT_COMPRESSION_FAILURE();
+        }
+        dst[(*offset)++] = flag;
+        repeat_count = 0;
+      }
+      last_x = point.x;
+      last_y = point.y;
+      previous_flag = flag;
+    }
+  }
+  if (repeat_count != 0) {
+    if (*offset >= dst_size) {
+      return FONT_COMPRESSION_FAILURE();
+    }
+    dst[(*offset)++] = repeat_count;
+  }
+
+  if (*offset + x_bytes + y_bytes > dst_size) {
+    return FONT_COMPRESSION_FAILURE();
+  }
+
+  // Store the x and y coordinates.
+  size_t x_offset = *offset;
+  size_t y_offset = *offset + x_bytes;
+  last_x = 0;
+  last_y = 0;
+  for (const auto& contour : glyph.contours) {
+    for (const auto& point : contour) {
+      int dx = point.x - last_x;
+      int dy = point.y - last_y;
+      if (dx == 0) {
+        // pass
+      } else if (dx > -256 && dx < 256) {
+        dst[x_offset++] = std::abs(dx);
+      } else {
+        Store16(dx, &x_offset, dst);
+      }
+      if (dy == 0) {
+        // pass
+      } else if (dy > -256 && dy < 256) {
+        dst[y_offset++] = std::abs(dy);
+      } else {
+        Store16(dy, &y_offset, dst);
+      }
+      last_x += dx;
+      last_y += dy;
+    }
+  }
+  *offset = y_offset;
+  return true;
+}
+
+}  // namespace
+
+bool StoreGlyph(const Glyph& glyph, uint8_t* dst, size_t* dst_size) {
+  size_t offset = 0;
+  if (glyph.composite_data_size > 0) {
+    // Composite glyph.
+    if (*dst_size < ((10ULL + glyph.composite_data_size) +
+                     ((glyph.have_instructions ? 2ULL : 0) +
+                      glyph.instructions_size))) {
+      return FONT_COMPRESSION_FAILURE();
+    }
+    Store16(-1, &offset, dst);
+    StoreBbox(glyph, &offset, dst);
+    StoreBytes(glyph.composite_data, glyph.composite_data_size, &offset, dst);
+    if (glyph.have_instructions) {
+      StoreInstructions(glyph, &offset, dst);
+    }
+  } else if (glyph.contours.size() > 0) {
+    // Simple glyph.
+    if (glyph.contours.size() > std::numeric_limits<int16_t>::max()) {
+      return FONT_COMPRESSION_FAILURE();
+    }
+    if (*dst_size < ((12ULL + 2 * glyph.contours.size()) +
+                     glyph.instructions_size)) {
+      return FONT_COMPRESSION_FAILURE();
+    }
+    Store16(glyph.contours.size(), &offset, dst);
+    StoreBbox(glyph, &offset, dst);
+    if (!StoreEndPtsOfContours(glyph, &offset, dst)) {
+      return FONT_COMPRESSION_FAILURE();
+    }
+    StoreInstructions(glyph, &offset, dst);
+    if (!StorePoints(glyph, &offset, dst, *dst_size)) {
+      return FONT_COMPRESSION_FAILURE();
+    }
+  }
+  *dst_size = offset;
+  return true;
+}
+
+} // namespace woff2
diff --git a/modules/woff2/src/glyph.h b/modules/woff2/src/glyph.h
new file mode 100644
index 0000000000..c38eb5f2bc
--- /dev/null
+++ b/modules/woff2/src/glyph.h
@@ -0,0 +1,71 @@
+/* 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 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 <inttypes.h>
+#include <stddef.h>
+
+#include <cstdint>
+#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),
+        overlap_simple_flag_set(false),
+        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;
+
+  // Flags.
+  bool overlap_simple_flag_set;
+
+  // 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_
diff --git a/modules/woff2/src/normalize.cc b/modules/woff2/src/normalize.cc
new file mode 100644
index 0000000000..6685e08752
--- /dev/null
+++ b/modules/woff2/src/normalize.cc
@@ -0,0 +1,314 @@
+/* Copyright 2013 Google Inc. All Rights Reserved.
+
+   Distributed under MIT license.
+   See file LICENSE for detail or copy at https://opensource.org/licenses/MIT
+*/
+
+/* 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"
+#include "./woff2_common.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);
+  }
+}
+
+}  // 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 = num_glyphs ? &glyf_table->buffer[0] : NULL;
+  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();
+    }
+    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;
+  }
+
+  StoreLoca(index_fmt, glyf_offset, &loca_offset, loca_dst);
+
+  glyf_table->buffer.resize(glyf_offset);
+  glyf_table->data = glyf_offset ? &glyf_table->buffer[0] : NULL;
+  glyf_table->length = glyf_offset;
+  loca_table->data = loca_offset ? &loca_table->buffer[0] : NULL;
+
+  return true;
+}
+
+}  // namespace
+
+namespace {
+
+bool MakeEditableBuffer(Font* font, int tableTag) {
+  Font::Table* table = font->FindTable(tableTag);
+  if (table == NULL) {
+    return FONT_COMPRESSION_FAILURE();
+  }
+  if (table->IsReused()) {
+    return true;
+  }
+  int sz = Round4(table->length);
+  table->buffer.resize(sz);
+  uint8_t* buf = &table->buffer[0];
+  memcpy(buf, table->data, table->length);
+  if (PREDICT_FALSE(sz > table->length)) {
+    memset(buf + table->length, 0, sz - table->length);
+  }
+  table->data = buf;
+  return true;
+}
+
+}  // namespace
+
+bool NormalizeGlyphs(Font* font) {
+  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();
+  }
+  // If you don't have glyf/loca this transform isn't very interesting
+  if (loca_table == NULL && glyf_table == NULL) {
+    return true;
+  }
+  // It would be best if you didn't have just one of glyf/loca
+  if ((glyf_table == NULL) != (loca_table == NULL)) {
+    return FONT_COMPRESSION_FAILURE();
+  }
+  // Must share neither or both loca & glyf
+  if (loca_table->IsReused() != glyf_table->IsReused()) {
+    return FONT_COMPRESSION_FAILURE();
+  }
+  if (loca_table->IsReused()) {
+    return true;
+  }
+
+  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 tag : font->OutputOrderedTags()) {
+    auto& table = font->tables[tag];
+    table.offset = offset;
+    offset += Round4(table.length);
+  }
+  return true;
+}
+
+namespace {
+
+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) {
+    const Font::Table* table = &i.second;
+    if (table->IsReused()) {
+      table = table->reuse_of;
+    }
+    checksum += table->tag;
+    checksum += table->checksum;
+    checksum += table->offset;
+    checksum += table->length;
+  }
+  return checksum;
+}
+
+}  // namespace
+
+bool FixChecksums(Font* font) {
+  Font::Table* head_table = font->FindTable(kHeadTableTag);
+  if (head_table == NULL) {
+    return FONT_COMPRESSION_FAILURE();
+  }
+  if (head_table->reuse_of != NULL) {
+    head_table = head_table->reuse_of;
+  }
+  if (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;
+  uint32_t head_checksum = 0;
+  for (auto& i : font->tables) {
+    Font::Table* table = &i.second;
+    if (table->IsReused()) {
+      table = table->reuse_of;
+    }
+    table->checksum = ComputeULongSum(table->data, table->length);
+    file_checksum += table->checksum;
+
+    if (table->tag == kHeadTableTag) {
+      head_checksum = table->checksum;
+    }
+  }
+
+  file_checksum += ComputeHeaderChecksum(*font);
+  offset = 8;
+  StoreU32(0xb1b0afba - file_checksum, &offset, head_buf);
+
+  return true;
+}
+
+namespace {
+bool MarkTransformed(Font* font) {
+  Font::Table* head_table = font->FindTable(kHeadTableTag);
+  if (head_table == NULL) {
+    return FONT_COMPRESSION_FAILURE();
+  }
+  if (head_table->reuse_of != NULL) {
+    head_table = head_table->reuse_of;
+  }
+  if (head_table->length < 17) {
+    return FONT_COMPRESSION_FAILURE();
+  }
+  // set bit 11 of head table 'flags' to indicate that font has undergone
+  // lossless modifying transform
+  int head_flags = head_table->data[16];
+  head_table->buffer[16] = head_flags | 0x08;
+  return true;
+}
+}  // namespace
+
+
+bool NormalizeWithoutFixingChecksums(Font* font) {
+  return (MakeEditableBuffer(font, kHeadTableTag) &&
+          RemoveDigitalSignature(font) &&
+          MarkTransformed(font) &&
+          NormalizeGlyphs(font) &&
+          NormalizeOffsets(font));
+}
+
+bool NormalizeFont(Font* font) {
+  return (NormalizeWithoutFixingChecksums(font) &&
+          FixChecksums(font));
+}
+
+bool NormalizeFontCollection(FontCollection* font_collection) {
+  if (font_collection->fonts.size() == 1) {
+    return NormalizeFont(&font_collection->fonts[0]);
+  }
+
+  uint32_t offset = CollectionHeaderSize(font_collection->header_version,
+    font_collection->fonts.size());
+  for (auto& font : font_collection->fonts) {
+    if (!NormalizeWithoutFixingChecksums(&font)) {
+#ifdef FONT_COMPRESSION_BIN
+      fprintf(stderr, "Font normalization failed.\n");
+#endif
+      return FONT_COMPRESSION_FAILURE();
+    }
+    offset += kSfntHeaderSize + kSfntEntrySize * font.num_tables;
+  }
+
+  // Start table offsets after TTC Header and Sfnt Headers
+  for (auto& font : font_collection->fonts) {
+    for (auto tag : font.OutputOrderedTags()) {
+      Font::Table& table = font.tables[tag];
+      if (table.IsReused()) {
+        table.offset = table.reuse_of->offset;
+      } else {
+        table.offset = offset;
+        offset += Round4(table.length);
+      }
+    }
+  }
+
+  // Now we can fix the checksums
+  for (auto& font : font_collection->fonts) {
+    if (!FixChecksums(&font)) {
+#ifdef FONT_COMPRESSION_BIN
+      fprintf(stderr, "Failed to fix checksums\n");
+#endif
+      return FONT_COMPRESSION_FAILURE();
+    }
+  }
+
+  return true;
+}
+
+} // namespace woff2
diff --git a/modules/woff2/src/normalize.h b/modules/woff2/src/normalize.h
new file mode 100644
index 0000000000..c6fee74db6
--- /dev/null
+++ b/modules/woff2/src/normalize.h
@@ -0,0 +1,39 @@
+/* Copyright 2013 Google Inc. All Rights Reserved.
+
+   Distributed under MIT license.
+   See file LICENSE for detail or copy at https://opensource.org/licenses/MIT
+*/
+
+/* 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;
+struct FontCollection;
+
+// 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);
+bool NormalizeFontCollection(FontCollection* font_collection);
+
+} // namespace woff2
+
+#endif  // WOFF2_NORMALIZE_H_
diff --git a/modules/woff2/src/port.h b/modules/woff2/src/port.h
new file mode 100644
index 0000000000..8b60fee8bc
--- /dev/null
+++ b/modules/woff2/src/port.h
@@ -0,0 +1,66 @@
+/* Copyright 2013 Google Inc. All Rights Reserved.
+
+   Distributed under MIT license.
+   See file LICENSE for detail or copy at https://opensource.org/licenses/MIT
+*/
+
+/* Helper function for bit twiddling and macros for branch prediction. */
+
+#ifndef WOFF2_PORT_H_
+#define WOFF2_PORT_H_
+
+#include <assert.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
+
+/* Compatibility with non-clang compilers. */
+#ifndef __has_builtin
+#define __has_builtin(x) 0
+#endif
+
+#if (__GNUC__ > 2) || (__GNUC__ == 2 && __GNUC_MINOR__ > 95) || \
+    (defined(__llvm__) && __has_builtin(__builtin_expect))
+#define PREDICT_FALSE(x) (__builtin_expect(x, 0))
+#define PREDICT_TRUE(x) (__builtin_expect(!!(x), 1))
+#else
+#define PREDICT_FALSE(x) (x)
+#define PREDICT_TRUE(x) (x)
+#endif
+
+#if (defined(__ARM_ARCH) && (__ARM_ARCH == 7)) || \
+    (defined(M_ARM) && (M_ARM == 7)) || \
+    defined(__aarch64__) || defined(__ARM64_ARCH_8__) || defined(__i386) || \
+    defined(_M_IX86) || defined(__x86_64__) || defined(_M_X64)
+#if defined(__BYTE_ORDER__) && (__BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__)
+#define WOFF_LITTLE_ENDIAN
+#elif defined(__BYTE_ORDER__) && (__BYTE_ORDER__ == __ORDER_BIG_ENDIAN__)
+#define WOFF_BIG_ENDIAN
+#endif  /* endianness */
+#endif  /* CPU whitelist */
+
+#endif  // WOFF2_PORT_H_
diff --git a/modules/woff2/src/round.h b/modules/woff2/src/round.h
new file mode 100644
index 0000000000..e5b2cb1220
--- /dev/null
+++ b/modules/woff2/src/round.h
@@ -0,0 +1,27 @@
+/* Copyright 2013 Google Inc. All Rights Reserved.
+
+   Distributed under MIT license.
+   See file LICENSE for detail or copy at https://opensource.org/licenses/MIT
+*/
+
+/* 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_
diff --git a/modules/woff2/src/store_bytes.h b/modules/woff2/src/store_bytes.h
new file mode 100644
index 0000000000..fff3c62f84
--- /dev/null
+++ b/modules/woff2/src/store_bytes.h
@@ -0,0 +1,71 @@
+/* Copyright 2013 Google Inc. All Rights Reserved.
+
+   Distributed under MIT license.
+   See file LICENSE for detail or copy at https://opensource.org/licenses/MIT
+*/
+
+/* 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>
+
+#include "./port.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) {
+#if defined(WOFF_LITTLE_ENDIAN)
+  *reinterpret_cast<uint16_t*>(dst + offset) =
+      ((x & 0xFF) << 8) | ((x & 0xFF00) >> 8);
+#elif defined(WOFF_BIG_ENDIAN)
+  *reinterpret_cast<uint16_t*>(dst + offset) = static_cast<uint16_t>(x);
+#else
+  dst[offset] = x >> 8;
+  dst[offset + 1] = x;
+#endif
+  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) {
+#if defined(WOFF_LITTLE_ENDIAN)
+  *reinterpret_cast<uint16_t*>(dst + *offset) =
+      ((val & 0xFF) << 8) | ((val & 0xFF00) >> 8);
+  *offset += 2;
+#elif defined(WOFF_BIG_ENDIAN)
+  *reinterpret_cast<uint16_t*>(dst + *offset) = static_cast<uint16_t>(val);
+  *offset += 2;
+#else
+  dst[(*offset)++] = val >> 8;
+  dst[(*offset)++] = val;
+#endif
+}
+
+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_
diff --git a/modules/woff2/src/table_tags.cc b/modules/woff2/src/table_tags.cc
new file mode 100644
index 0000000000..dca3ec8d28
--- /dev/null
+++ b/modules/woff2/src/table_tags.cc
@@ -0,0 +1,82 @@
+/* Copyright 2014 Google Inc. All Rights Reserved.
+
+   Distributed under MIT license.
+   See file LICENSE for detail or copy at https://opensource.org/licenses/MIT
+*/
+
+/* 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
diff --git a/modules/woff2/src/table_tags.h b/modules/woff2/src/table_tags.h
new file mode 100644
index 0000000000..42dc0ae1c4
--- /dev/null
+++ b/modules/woff2/src/table_tags.h
@@ -0,0 +1,30 @@
+/* Copyright 2014 Google Inc. All Rights Reserved.
+
+   Distributed under MIT license.
+   See file LICENSE for detail or copy at https://opensource.org/licenses/MIT
+*/
+
+/* 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;
+static const uint32_t kHmtxTableTag = 0x686d7478;
+static const uint32_t kHheaTableTag = 0x68686561;
+static const uint32_t kMaxpTableTag = 0x6d617870;
+
+extern const uint32_t kKnownTags[];
+
+} // namespace woff2
+
+#endif  // WOFF2_TABLE_TAGS_H_
diff --git a/modules/woff2/src/transform.cc b/modules/woff2/src/transform.cc
new file mode 100644
index 0000000000..1016efcd2b
--- /dev/null
+++ b/modules/woff2/src/transform.cc
@@ -0,0 +1,430 @@
+/* Copyright 2013 Google Inc. All Rights Reserved.
+
+   Distributed under MIT license.
+   See file LICENSE for detail or copy at https://opensource.org/licenses/MIT
+*/
+
+/* 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"
+#include "./variable_length.h"
+
+namespace woff2 {
+
+namespace {
+
+const int FLAG_ARG_1_AND_2_ARE_WORDS = 1 << 0;
+const int FLAG_WE_HAVE_INSTRUCTIONS = 1 << 8;
+const int FLAG_OVERLAP_SIMPLE_BITMAP = 1 << 0;
+
+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 (size_t 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);
+}
+
+// Glyf table preprocessing, based on
+// GlyfEncoder.java
+class GlyfEncoder {
+ public:
+  explicit GlyfEncoder(int num_glyphs)
+      : 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) {
+    WriteUShort(result, 0);  // Version
+    WriteUShort(result, overlap_bitmap_.empty()
+                            ? 0x00
+                            : FLAG_OVERLAP_SIMPLE_BITMAP);  // Flags
+    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_);
+    if (!overlap_bitmap_.empty()) {
+      WriteBytes(result, overlap_bitmap_);
+    }
+  }
+
+ private:
+  void WriteInstructions(const Glyph& glyph) {
+    Write255UShort(&glyph_stream_, glyph.instructions_size);
+    WriteBytes(&instruction_stream_,
+               glyph.instructions_data, glyph.instructions_size);
+  }
+
+  bool ShouldWriteSimpleGlyphBbox(const Glyph& glyph) {
+    if (glyph.contours.empty() || glyph.contours[0].empty()) {
+      return glyph.x_min || glyph.y_min || glyph.x_max || glyph.y_max;
+    }
+
+    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;
+      }
+    }
+
+    if (glyph.x_min != x_min)
+      return true;
+    if (glyph.y_min != y_min)
+      return true;
+    if (glyph.x_max != x_max)
+      return true;
+    if (glyph.y_max != y_max)
+      return true;
+
+    return false;
+  }
+
+  void WriteSimpleGlyph(int glyph_id, const Glyph& glyph) {
+    if (glyph.overlap_simple_flag_set) {
+      EnsureOverlapBitmap();
+      overlap_bitmap_[glyph_id >> 3] |= 0x80 >> (glyph_id & 7);
+    }
+    int num_contours = glyph.contours.size();
+    WriteUShort(&n_contour_stream_, num_contours);
+    if (ShouldWriteSimpleGlyphBbox(glyph)) {
+      WriteBbox(glyph_id, glyph);
+    }
+    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);
+    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);
+    }
+  }
+
+  void EnsureOverlapBitmap() {
+    if (overlap_bitmap_.empty()) {
+      overlap_bitmap_.resize((n_glyphs_ + 7) >> 3);
+    }
+  }
+
+  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_;
+  std::vector<uint8_t> overlap_bitmap_;
+  int n_glyphs_;
+};
+
+}  // namespace
+
+bool TransformGlyfAndLocaTables(Font* font) {
+  // no transform for CFF
+  const Font::Table* glyf_table = font->FindTable(kGlyfTableTag);
+  const Font::Table* loca_table = font->FindTable(kLocaTableTag);
+
+  // If you don't have glyf/loca this transform isn't very interesting
+  if (loca_table == NULL && glyf_table == NULL) {
+    return true;
+  }
+  // It would be best if you didn't have just one of glyf/loca
+  if ((glyf_table == NULL) != (loca_table == NULL)) {
+    return FONT_COMPRESSION_FAILURE();
+  }
+  // Must share neither or both loca & glyf
+  if (loca_table->IsReused() != glyf_table->IsReused()) {
+    return FONT_COMPRESSION_FAILURE();
+  }
+  if (loca_table->IsReused()) {
+    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;
+}
+
+// See https://www.microsoft.com/typography/otspec/hmtx.htm
+// See WOFF2 spec, 5.4. Transformed hmtx table format
+bool TransformHmtxTable(Font* font) {
+  const Font::Table* glyf_table = font->FindTable(kGlyfTableTag);
+  const Font::Table* hmtx_table = font->FindTable(kHmtxTableTag);
+  const Font::Table* hhea_table = font->FindTable(kHheaTableTag);
+
+  // If you don't have hmtx or a glyf not much is going to happen here
+  if (hmtx_table == NULL || glyf_table == NULL) {
+    return true;
+  }
+
+  // hmtx without hhea doesn't make sense
+  if (hhea_table == NULL) {
+    return FONT_COMPRESSION_FAILURE();
+  }
+
+  // Skip 34 to reach 'hhea' numberOfHMetrics
+  Buffer hhea_buf(hhea_table->data, hhea_table->length);
+  uint16_t num_hmetrics;
+  if (!hhea_buf.Skip(34) || !hhea_buf.ReadU16(&num_hmetrics)) {
+    return FONT_COMPRESSION_FAILURE();
+  }
+
+  // Must have at least one hMetric
+  if (num_hmetrics < 1) {
+    return FONT_COMPRESSION_FAILURE();
+  }
+
+  int num_glyphs = NumGlyphs(*font);
+
+  // Most fonts can be transformed; assume it's a go until proven otherwise
+  std::vector<uint16_t> advance_widths;
+  std::vector<int16_t> proportional_lsbs;
+  std::vector<int16_t> monospace_lsbs;
+
+  bool remove_proportional_lsb = true;
+  bool remove_monospace_lsb = (num_glyphs - num_hmetrics) > 0;
+
+  Buffer hmtx_buf(hmtx_table->data, hmtx_table->length);
+  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();
+    }
+
+    uint16_t advance_width = 0;
+    int16_t lsb = 0;
+
+    if (i < num_hmetrics) {
+      // [0, num_hmetrics) are proportional hMetrics
+      if (!hmtx_buf.ReadU16(&advance_width)) {
+        return FONT_COMPRESSION_FAILURE();
+      }
+
+      if (!hmtx_buf.ReadS16(&lsb)) {
+        return FONT_COMPRESSION_FAILURE();
+      }
+
+      if (glyph_size > 0 && glyph.x_min != lsb) {
+        remove_proportional_lsb = false;
+      }
+
+      advance_widths.push_back(advance_width);
+      proportional_lsbs.push_back(lsb);
+    } else {
+      // [num_hmetrics, num_glyphs) are monospace leftSideBearing's
+      if (!hmtx_buf.ReadS16(&lsb)) {
+        return FONT_COMPRESSION_FAILURE();
+      }
+      if (glyph_size > 0 && glyph.x_min != lsb) {
+        remove_monospace_lsb = false;
+      }
+      monospace_lsbs.push_back(lsb);
+    }
+
+    // If we know we can't optimize, bail out completely
+    if (!remove_proportional_lsb && !remove_monospace_lsb) {
+      return true;
+    }
+  }
+
+  Font::Table* transformed_hmtx = &font->tables[kHmtxTableTag ^ 0x80808080];
+
+  uint8_t flags = 0;
+  size_t transformed_size = 1 + 2 * advance_widths.size();
+  if (remove_proportional_lsb) {
+    flags |= 1;
+  } else {
+    transformed_size += 2 * proportional_lsbs.size();
+  }
+  if (remove_monospace_lsb) {
+    flags |= 1 << 1;
+  } else {
+    transformed_size += 2 * monospace_lsbs.size();
+  }
+
+  transformed_hmtx->buffer.reserve(transformed_size);
+  std::vector<uint8_t>* out = &transformed_hmtx->buffer;
+  WriteBytes(out, &flags, 1);
+  for (uint16_t advance_width : advance_widths) {
+    WriteUShort(out, advance_width);
+  }
+
+  if (!remove_proportional_lsb) {
+    for (int16_t lsb : proportional_lsbs) {
+      WriteUShort(out, lsb);
+    }
+  }
+  if (!remove_monospace_lsb) {
+    for (int16_t lsb : monospace_lsbs) {
+      WriteUShort(out, lsb);
+    }
+  }
+
+  transformed_hmtx->tag = kHmtxTableTag ^ 0x80808080;
+  transformed_hmtx->flag_byte = 1 << 6;
+  transformed_hmtx->length = transformed_hmtx->buffer.size();
+  transformed_hmtx->data = transformed_hmtx->buffer.data();
+
+
+  return true;
+}
+
+} // namespace woff2
diff --git a/modules/woff2/src/transform.h b/modules/woff2/src/transform.h
new file mode 100644
index 0000000000..a4583d16cb
--- /dev/null
+++ b/modules/woff2/src/transform.h
@@ -0,0 +1,26 @@
+/* Copyright 2014 Google Inc. All Rights Reserved.
+
+   Distributed under MIT license.
+   See file LICENSE for detail or copy at https://opensource.org/licenses/MIT
+*/
+
+/* 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);
+
+// Apply transformation to hmtx table if applicable for this font.
+bool TransformHmtxTable(Font* font);
+
+} // namespace woff2
+
+#endif  // WOFF2_TRANSFORM_H_
diff --git a/modules/woff2/src/variable_length.cc b/modules/woff2/src/variable_length.cc
new file mode 100644
index 0000000000..4f348d5e50
--- /dev/null
+++ b/modules/woff2/src/variable_length.cc
@@ -0,0 +1,129 @@
+/* Copyright 2015 Google Inc. All Rights Reserved.
+
+   Distributed under MIT license.
+   See file LICENSE for detail or copy at https://opensource.org/licenses/MIT
+*/
+
+/* Helper functions for woff2 variable length types: 255UInt16 and UIntBase128 */
+
+#include "./variable_length.h"
+
+namespace woff2 {
+
+size_t Size255UShort(uint16_t value) {
+  size_t result = 3;
+  if (value < 253) {
+    result = 1;
+  } else if (value < 762) {
+    result = 2;
+  } else {
+    result = 3;
+  }
+  return result;
+}
+
+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);
+  }
+}
+
+void Store255UShort(int val, size_t* offset, uint8_t* dst) {
+  std::vector<uint8_t> packed;
+  Write255UShort(&packed, val);
+  for (uint8_t packed_byte : packed) {
+    dst[(*offset)++] = packed_byte;
+  }
+}
+
+// Based on section 6.1.1 of MicroType Express draft spec
+bool Read255UShort(Buffer* buf, unsigned int* value) {
+  static const int kWordCode = 253;
+  static const int kOneMoreByteCode2 = 254;
+  static const int kOneMoreByteCode1 = 255;
+  static const int kLowestUCode = 253;
+  uint8_t code = 0;
+  if (!buf->ReadU8(&code)) {
+    return FONT_COMPRESSION_FAILURE();
+  }
+  if (code == kWordCode) {
+    uint16_t result = 0;
+    if (!buf->ReadU16(&result)) {
+      return FONT_COMPRESSION_FAILURE();
+    }
+    *value = result;
+    return true;
+  } else if (code == kOneMoreByteCode1) {
+    uint8_t result = 0;
+    if (!buf->ReadU8(&result)) {
+      return FONT_COMPRESSION_FAILURE();
+    }
+    *value = result + kLowestUCode;
+    return true;
+  } else if (code == kOneMoreByteCode2) {
+    uint8_t result = 0;
+    if (!buf->ReadU8(&result)) {
+      return FONT_COMPRESSION_FAILURE();
+    }
+    *value = result + kLowestUCode * 2;
+    return true;
+  } else {
+    *value = code;
+    return true;
+  }
+}
+
+bool ReadBase128(Buffer* buf, uint32_t* value) {
+  uint32_t result = 0;
+  for (size_t i = 0; i < 5; ++i) {
+    uint8_t code = 0;
+    if (!buf->ReadU8(&code)) {
+      return FONT_COMPRESSION_FAILURE();
+    }
+    // Leading zeros are invalid.
+    if (i == 0 && code == 0x80) {
+      return FONT_COMPRESSION_FAILURE();
+    }
+    // If any of the top seven bits are set then we're about to overflow.
+    if (result & 0xfe000000) {
+      return FONT_COMPRESSION_FAILURE();
+    }
+    result = (result << 7) | (code & 0x7f);
+    if ((code & 0x80) == 0) {
+      *value = result;
+      return true;
+    }
+  }
+  // Make sure not to exceed the size bound
+  return FONT_COMPRESSION_FAILURE();
+}
+
+size_t Base128Size(size_t n) {
+  size_t size = 1;
+  for (; n >= 128; n >>= 7) ++size;
+  return size;
+}
+
+void StoreBase128(size_t len, size_t* offset, uint8_t* dst) {
+  size_t size = Base128Size(len);
+  for (size_t i = 0; i < size; ++i) {
+    int b = static_cast<int>((len >> (7 * (size - i - 1))) & 0x7f);
+    if (i < size - 1) {
+      b |= 0x80;
+    }
+    dst[(*offset)++] = b;
+  }
+}
+
+} // namespace woff2
+
diff --git a/modules/woff2/src/variable_length.h b/modules/woff2/src/variable_length.h
new file mode 100644
index 0000000000..2080106535
--- /dev/null
+++ b/modules/woff2/src/variable_length.h
@@ -0,0 +1,30 @@
+/* Copyright 2015 Google Inc. All Rights Reserved.
+
+   Distributed under MIT license.
+   See file LICENSE for detail or copy at https://opensource.org/licenses/MIT
+*/
+
+/* Helper functions for woff2 variable length types: 255UInt16 and UIntBase128 */
+
+#ifndef WOFF2_VARIABLE_LENGTH_H_
+#define WOFF2_VARIABLE_LENGTH_H_
+
+#include <inttypes.h>
+#include <vector>
+#include "./buffer.h"
+
+namespace woff2 {
+
+size_t Size255UShort(uint16_t value);
+bool Read255UShort(Buffer* buf, unsigned int* value);
+void Write255UShort(std::vector<uint8_t>* out, int value);
+void Store255UShort(int val, size_t* offset, uint8_t* dst);
+
+size_t Base128Size(size_t n);
+bool ReadBase128(Buffer* buf, uint32_t* value);
+void StoreBase128(size_t len, size_t* offset, uint8_t* dst);
+
+} // namespace woff2
+
+#endif  // WOFF2_VARIABLE_LENGTH_H_
+
diff --git a/modules/woff2/src/woff2_common.cc b/modules/woff2/src/woff2_common.cc
new file mode 100644
index 0000000000..fe0a3beda7
--- /dev/null
+++ b/modules/woff2/src/woff2_common.cc
@@ -0,0 +1,58 @@
+/* Copyright 2013 Google Inc. All Rights Reserved.
+
+   Distributed under MIT license.
+   See file LICENSE for detail or copy at https://opensource.org/licenses/MIT
+*/
+
+/* Helpers common across multiple parts of woff2 */
+
+#include <algorithm>
+
+#include "./woff2_common.h"
+
+#include "./port.h"
+
+namespace woff2 {
+
+
+uint32_t ComputeULongSum(const uint8_t* buf, size_t size) {
+  uint32_t checksum = 0;
+  size_t aligned_size = size & ~3;
+  for (size_t i = 0; i < aligned_size; i += 4) {
+#if defined(WOFF_LITTLE_ENDIAN)
+    uint32_t v = *reinterpret_cast<const uint32_t*>(buf + i);
+    checksum += (((v & 0xFF) << 24) | ((v & 0xFF00) << 8) |
+      ((v & 0xFF0000) >> 8) | ((v & 0xFF000000) >> 24));
+#elif defined(WOFF_BIG_ENDIAN)
+    checksum += *reinterpret_cast<const uint32_t*>(buf + i);
+#else
+    checksum += (buf[i] << 24) | (buf[i + 1] << 16) |
+      (buf[i + 2] << 8) | buf[i + 3];
+#endif
+  }
+
+  // treat size not aligned on 4 as if it were padded to 4 with 0's
+  if (size != aligned_size) {
+    uint32_t v = 0;
+    for (size_t i = aligned_size; i < size; ++i) {
+      v |= buf[i] << (24 - 8 * (i & 3));
+    }
+    checksum += v;
+  }
+
+  return checksum;
+}
+
+size_t CollectionHeaderSize(uint32_t header_version, uint32_t num_fonts) {
+  size_t size = 0;
+  if (header_version == 0x00020000) {
+    size += 12;  // ulDsig{Tag,Length,Offset}
+  }
+  if (header_version == 0x00010000 || header_version == 0x00020000) {
+    size += 12   // TTCTag, Version, numFonts
+      + 4 * num_fonts;  // OffsetTable[numFonts]
+  }
+  return size;
+}
+
+} // namespace woff2
diff --git a/modules/woff2/src/woff2_common.h b/modules/woff2/src/woff2_common.h
new file mode 100644
index 0000000000..51fd4a7bf8
--- /dev/null
+++ b/modules/woff2/src/woff2_common.h
@@ -0,0 +1,64 @@
+/* Copyright 2014 Google Inc. All Rights Reserved.
+
+   Distributed under MIT license.
+   See file LICENSE for detail or copy at https://opensource.org/licenses/MIT
+*/
+
+/* Common definition for WOFF2 encoding/decoding */
+
+#ifndef WOFF2_WOFF2_COMMON_H_
+#define WOFF2_WOFF2_COMMON_H_
+
+#include <stddef.h>
+#include <inttypes.h>
+
+#include <string>
+
+namespace woff2 {
+
+static const uint32_t kWoff2Signature = 0x774f4632;  // "wOF2"
+
+// Leave the first byte open to store flag_byte
+const unsigned int kWoff2FlagsTransform = 1 << 8;
+
+// TrueType Collection ID string: 'ttcf'
+static const uint32_t kTtcFontFlavor = 0x74746366;
+
+static const size_t kSfntHeaderSize = 12;
+static const size_t kSfntEntrySize = 16;
+
+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;
+  }
+};
+
+
+// Size of the collection header. 0 if version indicates this isn't a
+// collection. Ref http://www.microsoft.com/typography/otspec/otff.htm,
+// True Type Collections
+size_t CollectionHeaderSize(uint32_t header_version, uint32_t num_fonts);
+
+// Compute checksum over size bytes of buf
+uint32_t ComputeULongSum(const uint8_t* buf, size_t size);
+
+} // namespace woff2
+
+#endif  // WOFF2_WOFF2_COMMON_H_
diff --git a/modules/woff2/src/woff2_compress.cc b/modules/woff2/src/woff2_compress.cc
new file mode 100644
index 0000000000..36e8fcafe9
--- /dev/null
+++ b/modules/woff2/src/woff2_compress.cc
@@ -0,0 +1,43 @@
+/* Copyright 2013 Google Inc. All Rights Reserved.
+
+   Distributed under MIT license.
+   See file LICENSE for detail or copy at https://opensource.org/licenses/MIT
+*/
+
+/* A commandline tool for compressing ttf format files to woff2. */
+
+#include <string>
+
+#include "file.h"
+#include <woff2/encode.h>
+
+
+int main(int argc, char **argv) {
+  if (argc != 2) {
+    fprintf(stderr, "One argument, the input filename, must be provided.\n");
+    return 1;
+  }
+
+  std::string filename(argv[1]);
+  std::string outfilename = filename.substr(0, filename.find_last_of(".")) + ".woff2";
+  fprintf(stdout, "Processing %s => %s\n",
+    filename.c_str(), outfilename.c_str());
+  std::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());
+  std::string output(output_size, 0);
+  uint8_t* output_data = reinterpret_cast<uint8_t*>(&output[0]);
+
+  woff2::WOFF2Params params;
+  if (!woff2::ConvertTTFToWOFF2(input_data, input.size(),
+                                output_data, &output_size, params)) {
+    fprintf(stderr, "Compression failed.\n");
+    return 1;
+  }
+  output.resize(output_size);
+
+  woff2::SetFileContents(outfilename, output.begin(), output.end());
+
+  return 0;
+}
diff --git a/modules/woff2/src/woff2_dec.cc b/modules/woff2/src/woff2_dec.cc
new file mode 100644
index 0000000000..f1f98cb51a
--- /dev/null
+++ b/modules/woff2/src/woff2_dec.cc
@@ -0,0 +1,1399 @@
+/* Copyright 2014 Google Inc. All Rights Reserved.
+
+   Distributed under MIT license.
+   See file LICENSE for detail or copy at https://opensource.org/licenses/MIT
+*/
+
+/* Library for converting WOFF2 format font files to their TTF versions. */
+
+#include <woff2/decode.h>
+
+#include <stdlib.h>
+#include <algorithm>
+#include <complex>
+#include <cstring>
+#include <limits>
+#include <string>
+#include <vector>
+#include <map>
+#include <memory>
+#include <utility>
+
+#include "./buffer.h"
+#include "./port.h"
+#include "./round.h"
+#include "./store_bytes.h"
+#include "./table_tags.h"
+#include "./variable_length.h"
+#include "./woff2_common.h"
+
+#include "../RLBoxWOFF2Sandbox.h"
+
+namespace woff2 {
+
+namespace {
+
+// simple glyph flags
+const int kGlyfOnCurve = 1 << 0;
+const int kGlyfXShort = 1 << 1;
+const int kGlyfYShort = 1 << 2;
+const int kGlyfRepeat = 1 << 3;
+const int kGlyfThisXIsSame = 1 << 4;
+const int kGlyfThisYIsSame = 1 << 5;
+const int kOverlapSimple = 1 << 6;
+
+// composite glyph flags
+// See CompositeGlyph.java in sfntly for full definitions
+const int FLAG_ARG_1_AND_2_ARE_WORDS = 1 << 0;
+const int FLAG_WE_HAVE_A_SCALE = 1 << 3;
+const int FLAG_MORE_COMPONENTS = 1 << 5;
+const int FLAG_WE_HAVE_AN_X_AND_Y_SCALE = 1 << 6;
+const int FLAG_WE_HAVE_A_TWO_BY_TWO = 1 << 7;
+const int FLAG_WE_HAVE_INSTRUCTIONS = 1 << 8;
+
+// glyf flags
+const int FLAG_OVERLAP_SIMPLE_BITMAP = 1 << 0;
+
+const size_t kCheckSumAdjustmentOffset = 8;
+
+const size_t kEndPtsOfContoursOffset = 10;
+const size_t kCompositeGlyphBegin = 10;
+
+// 98% of Google Fonts have no glyph above 5k bytes
+// Largest glyph ever observed was 72k bytes
+const size_t kDefaultGlyphBuf = 5120;
+
+// Over 14k test fonts the max compression ratio seen to date was ~20.
+// >100 suggests you wrote a bad uncompressed size.
+const float kMaxPlausibleCompressionRatio = 100.0;
+
+// metadata for a TTC font entry
+struct TtcFont {
+  uint32_t flavor;
+  uint32_t dst_offset;
+  uint32_t header_checksum;
+  std::vector<uint16_t> table_indices;
+};
+
+struct WOFF2Header {
+  uint32_t flavor;
+  uint32_t header_version;
+  uint16_t num_tables;
+  uint64_t compressed_offset;
+  uint32_t compressed_length;
+  uint32_t uncompressed_size;
+  std::vector<Table> tables;  // num_tables unique tables
+  std::vector<TtcFont> ttc_fonts;  // metadata to help rebuild font
+};
+
+/**
+ * Accumulates data we may need to reconstruct a single font. One per font
+ * created for a TTC.
+ */
+struct WOFF2FontInfo {
+  uint16_t num_glyphs;
+  uint16_t index_format;
+  uint16_t num_hmetrics;
+  std::vector<int16_t> x_mins;
+  std::map<uint32_t, uint32_t> table_entry_by_tag;
+};
+
+// Accumulates metadata as we rebuild the font
+struct RebuildMetadata {
+  uint32_t header_checksum;  // set by WriteHeaders
+  std::vector<WOFF2FontInfo> font_infos;
+  // checksums for tables that have been written.
+  // (tag, src_offset) => checksum. Need both because 0-length loca.
+  std::map<std::pair<uint32_t, uint32_t>, uint32_t> checksums;
+};
+
+int WithSign(int flag, int baseval) {
+  // Precondition: 0 <= baseval < 65536 (to avoid integer overflow)
+  return (flag & 1) ? baseval : -baseval;
+}
+
+bool _SafeIntAddition(int a, int b, int* result) {
+  if (PREDICT_FALSE(
+          ((a > 0) && (b > std::numeric_limits<int>::max() - a)) ||
+          ((a < 0) && (b < std::numeric_limits<int>::min() - a)))) {
+    return false;
+  }
+  *result = a + b;
+  return true;
+}
+
+bool TripletDecode(const uint8_t* flags_in, const uint8_t* in, size_t in_size,
+    unsigned int n_points, Point* result, size_t* in_bytes_consumed) {
+  int x = 0;
+  int y = 0;
+
+  if (PREDICT_FALSE(n_points > in_size)) {
+    return FONT_COMPRESSION_FAILURE();
+  }
+  unsigned int triplet_index = 0;
+
+  for (unsigned int i = 0; i < n_points; ++i) {
+    uint8_t flag = flags_in[i];
+    bool on_curve = !(flag >> 7);
+    flag &= 0x7f;
+    unsigned int n_data_bytes;
+    if (flag < 84) {
+      n_data_bytes = 1;
+    } else if (flag < 120) {
+      n_data_bytes = 2;
+    } else if (flag < 124) {
+      n_data_bytes = 3;
+    } else {
+      n_data_bytes = 4;
+    }
+    if (PREDICT_FALSE(triplet_index + n_data_bytes > in_size ||
+        triplet_index + n_data_bytes < triplet_index)) {
+      return FONT_COMPRESSION_FAILURE();
+    }
+    int dx, dy;
+    if (flag < 10) {
+      dx = 0;
+      dy = WithSign(flag, ((flag & 14) << 7) + in[triplet_index]);
+    } else if (flag < 20) {
+      dx = WithSign(flag, (((flag - 10) & 14) << 7) + in[triplet_index]);
+      dy = 0;
+    } else if (flag < 84) {
+      int b0 = flag - 20;
+      int b1 = in[triplet_index];
+      dx = WithSign(flag, 1 + (b0 & 0x30) + (b1 >> 4));
+      dy = WithSign(flag >> 1, 1 + ((b0 & 0x0c) << 2) + (b1 & 0x0f));
+    } else if (flag < 120) {
+      int b0 = flag - 84;
+      dx = WithSign(flag, 1 + ((b0 / 12) << 8) + in[triplet_index]);
+      dy = WithSign(flag >> 1,
+                    1 + (((b0 % 12) >> 2) << 8) + in[triplet_index + 1]);
+    } else if (flag < 124) {
+      int b2 = in[triplet_index + 1];
+      dx = WithSign(flag, (in[triplet_index] << 4) + (b2 >> 4));
+      dy = WithSign(flag >> 1, ((b2 & 0x0f) << 8) + in[triplet_index + 2]);
+    } else {
+      dx = WithSign(flag, (in[triplet_index] << 8) + in[triplet_index + 1]);
+      dy = WithSign(flag >> 1,
+          (in[triplet_index + 2] << 8) + in[triplet_index + 3]);
+    }
+    triplet_index += n_data_bytes;
+    if (!_SafeIntAddition(x, dx, &x)) {
+      return false;
+    }
+    if (!_SafeIntAddition(y, dy, &y)) {
+      return false;
+    }
+    *result++ = {x, y, on_curve};
+  }
+  *in_bytes_consumed = triplet_index;
+  return true;
+}
+
+// This function stores just the point data. On entry, dst points to the
+// beginning of a simple glyph. Returns true on success.
+bool StorePoints(unsigned int n_points, const Point* points,
+                 unsigned int n_contours, unsigned int instruction_length,
+                 bool has_overlap_bit, uint8_t* dst, size_t dst_size,
+                 size_t* glyph_size) {
+  // I believe that n_contours < 65536, in which case this is safe. However, a
+  // comment and/or an assert would be good.
+  unsigned int flag_offset = kEndPtsOfContoursOffset + 2 * n_contours + 2 +
+    instruction_length;
+  int last_flag = -1;
+  int repeat_count = 0;
+  int last_x = 0;
+  int last_y = 0;
+  unsigned int x_bytes = 0;
+  unsigned int y_bytes = 0;
+
+  for (unsigned int i = 0; i < n_points; ++i) {
+    const Point& point = points[i];
+    int flag = point.on_curve ? kGlyfOnCurve : 0;
+    if (has_overlap_bit && i == 0) {
+      flag |= kOverlapSimple;
+    }
+
+    int dx = point.x - last_x;
+    int dy = point.y - last_y;
+    if (dx == 0) {
+      flag |= kGlyfThisXIsSame;
+    } else if (dx > -256 && dx < 256) {
+      flag |= kGlyfXShort | (dx > 0 ? kGlyfThisXIsSame : 0);
+      x_bytes += 1;
+    } else {
+      x_bytes += 2;
+    }
+    if (dy == 0) {
+      flag |= kGlyfThisYIsSame;
+    } else if (dy > -256 && dy < 256) {
+      flag |= kGlyfYShort | (dy > 0 ? kGlyfThisYIsSame : 0);
+      y_bytes += 1;
+    } else {
+      y_bytes += 2;
+    }
+
+    if (flag == last_flag && repeat_count != 255) {
+      dst[flag_offset - 1] |= kGlyfRepeat;
+      repeat_count++;
+    } else {
+      if (repeat_count != 0) {
+        if (PREDICT_FALSE(flag_offset >= dst_size)) {
+          return FONT_COMPRESSION_FAILURE();
+        }
+        dst[flag_offset++] = repeat_count;
+      }
+      if (PREDICT_FALSE(flag_offset >= dst_size)) {
+        return FONT_COMPRESSION_FAILURE();
+      }
+      dst[flag_offset++] = flag;
+      repeat_count = 0;
+    }
+    last_x = point.x;
+    last_y = point.y;
+    last_flag = flag;
+  }
+
+  if (repeat_count != 0) {
+    if (PREDICT_FALSE(flag_offset >= dst_size)) {
+      return FONT_COMPRESSION_FAILURE();
+    }
+    dst[flag_offset++] = repeat_count;
+  }
+  unsigned int xy_bytes = x_bytes + y_bytes;
+  if (PREDICT_FALSE(xy_bytes < x_bytes ||
+      flag_offset + xy_bytes < flag_offset ||
+      flag_offset + xy_bytes > dst_size)) {
+    return FONT_COMPRESSION_FAILURE();
+  }
+
+  int x_offset = flag_offset;
+  int y_offset = flag_offset + x_bytes;
+  last_x = 0;
+  last_y = 0;
+  for (unsigned int i = 0; i < n_points; ++i) {
+    int dx = points[i].x - last_x;
+    if (dx == 0) {
+      // pass
+    } else if (dx > -256 && dx < 256) {
+      dst[x_offset++] = std::abs(dx);
+    } else {
+      // will always fit for valid input, but overflow is harmless
+      x_offset = Store16(dst, x_offset, dx);
+    }
+    last_x += dx;
+    int dy = points[i].y - last_y;
+    if (dy == 0) {
+      // pass
+    } else if (dy > -256 && dy < 256) {
+      dst[y_offset++] = std::abs(dy);
+    } else {
+      y_offset = Store16(dst, y_offset, dy);
+    }
+    last_y += dy;
+  }
+  *glyph_size = y_offset;
+  return true;
+}
+
+// Compute the bounding box of the coordinates, and store into a glyf buffer.
+// A precondition is that there are at least 10 bytes available.
+// dst should point to the beginning of a 'glyf' record.
+void ComputeBbox(unsigned int n_points, const Point* points, uint8_t* dst) {
+  int x_min = 0;
+  int y_min = 0;
+  int x_max = 0;
+  int y_max = 0;
+
+  if (n_points > 0) {
+    x_min = points[0].x;
+    x_max = points[0].x;
+    y_min = points[0].y;
+    y_max = points[0].y;
+  }
+  for (unsigned int i = 1; i < n_points; ++i) {
+    int x = points[i].x;
+    int y = points[i].y;
+    x_min = std::min(x, x_min);
+    x_max = std::max(x, x_max);
+    y_min = std::min(y, y_min);
+    y_max = std::max(y, y_max);
+  }
+  size_t offset = 2;
+  offset = Store16(dst, offset, x_min);
+  offset = Store16(dst, offset, y_min);
+  offset = Store16(dst, offset, x_max);
+  offset = Store16(dst, offset, y_max);
+}
+
+
+bool SizeOfComposite(Buffer composite_stream, size_t* size,
+                     bool* have_instructions) {
+  size_t start_offset = composite_stream.offset();
+  bool we_have_instructions = false;
+
+  uint16_t flags = FLAG_MORE_COMPONENTS;
+  while (flags & FLAG_MORE_COMPONENTS) {
+    if (PREDICT_FALSE(!composite_stream.ReadU16(&flags))) {
+      return FONT_COMPRESSION_FAILURE();
+    }
+    we_have_instructions |= (flags & FLAG_WE_HAVE_INSTRUCTIONS) != 0;
+    size_t arg_size = 2;  // glyph index
+    if (flags & FLAG_ARG_1_AND_2_ARE_WORDS) {
+      arg_size += 4;
+    } else {
+      arg_size += 2;
+    }
+    if (flags & FLAG_WE_HAVE_A_SCALE) {
+      arg_size += 2;
+    } else if (flags & FLAG_WE_HAVE_AN_X_AND_Y_SCALE) {
+      arg_size += 4;
+    } else if (flags & FLAG_WE_HAVE_A_TWO_BY_TWO) {
+      arg_size += 8;
+    }
+    if (PREDICT_FALSE(!composite_stream.Skip(arg_size))) {
+      return FONT_COMPRESSION_FAILURE();
+    }
+  }
+
+  *size = composite_stream.offset() - start_offset;
+  *have_instructions = we_have_instructions;
+
+  return true;
+}
+
+bool Pad4(WOFF2Out* out) {
+  uint8_t zeroes[] = {0, 0, 0};
+  if (PREDICT_FALSE(out->Size() + 3 < out->Size())) {
+    return FONT_COMPRESSION_FAILURE();
+  }
+  uint32_t pad_bytes = Round4(out->Size()) - out->Size();
+  if (pad_bytes > 0) {
+    if (PREDICT_FALSE(!out->Write(&zeroes, pad_bytes))) {
+      return FONT_COMPRESSION_FAILURE();
+    }
+  }
+  return true;
+}
+
+// Build TrueType loca table
+bool StoreLoca(const std::vector<uint32_t>& loca_values, int index_format,
+               uint32_t* checksum, WOFF2Out* out) {
+  // TODO(user) figure out what index format to use based on whether max
+  // offset fits into uint16_t or not
+  const uint64_t loca_size = loca_values.size();
+  const uint64_t offset_size = index_format ? 4 : 2;
+  if (PREDICT_FALSE((loca_size << 2) >> 2 != loca_size)) {
+    return FONT_COMPRESSION_FAILURE();
+  }
+  std::vector<uint8_t> loca_content(loca_size * offset_size);
+  uint8_t* dst = &loca_content[0];
+  size_t offset = 0;
+  for (size_t i = 0; i < loca_values.size(); ++i) {
+    uint32_t value = loca_values[i];
+    if (index_format) {
+      offset = StoreU32(dst, offset, value);
+    } else {
+      offset = Store16(dst, offset, value >> 1);
+    }
+  }
+  *checksum = ComputeULongSum(&loca_content[0], loca_content.size());
+  if (PREDICT_FALSE(!out->Write(&loca_content[0], loca_content.size()))) {
+    return FONT_COMPRESSION_FAILURE();
+  }
+  return true;
+}
+
+// Reconstruct entire glyf table based on transformed original
+bool ReconstructGlyf(const uint8_t* data, Table* glyf_table,
+                     uint32_t* glyf_checksum, Table * loca_table,
+                     uint32_t* loca_checksum, WOFF2FontInfo* info,
+                     WOFF2Out* out) {
+  static const int kNumSubStreams = 7;
+  Buffer file(data, glyf_table->transform_length);
+  uint16_t version;
+  std::vector<std::pair<const uint8_t*, size_t> > substreams(kNumSubStreams);
+  const size_t glyf_start = out->Size();
+
+  if (PREDICT_FALSE(!file.ReadU16(&version))) {
+    return FONT_COMPRESSION_FAILURE();
+  }
+
+  uint16_t flags;
+  if (PREDICT_FALSE(!file.ReadU16(&flags))) {
+    return FONT_COMPRESSION_FAILURE();
+  }
+  bool has_overlap_bitmap = (flags & FLAG_OVERLAP_SIMPLE_BITMAP);
+
+  if (PREDICT_FALSE(!file.ReadU16(&info->num_glyphs) ||
+      !file.ReadU16(&info->index_format))) {
+    return FONT_COMPRESSION_FAILURE();
+  }
+
+  // https://dev.w3.org/webfonts/WOFF2/spec/#conform-mustRejectLoca
+  // dst_length here is origLength in the spec
+  uint32_t expected_loca_dst_length = (info->index_format ? 4 : 2)
+    * (static_cast<uint32_t>(info->num_glyphs) + 1);
+  if (PREDICT_FALSE(loca_table->dst_length != expected_loca_dst_length)) {
+    return FONT_COMPRESSION_FAILURE();
+  }
+
+  unsigned int offset = (2 + kNumSubStreams) * 4;
+  if (PREDICT_FALSE(offset > glyf_table->transform_length)) {
+    return FONT_COMPRESSION_FAILURE();
+  }
+  // Invariant from here on: data_size >= offset
+  for (int i = 0; i < kNumSubStreams; ++i) {
+    uint32_t substream_size;
+    if (PREDICT_FALSE(!file.ReadU32(&substream_size))) {
+      return FONT_COMPRESSION_FAILURE();
+    }
+    if (PREDICT_FALSE(substream_size > glyf_table->transform_length - offset)) {
+      return FONT_COMPRESSION_FAILURE();
+    }
+    substreams[i] = std::make_pair(data + offset, substream_size);
+    offset += substream_size;
+  }
+  Buffer n_contour_stream(substreams[0].first, substreams[0].second);
+  Buffer n_points_stream(substreams[1].first, substreams[1].second);
+  Buffer flag_stream(substreams[2].first, substreams[2].second);
+  Buffer glyph_stream(substreams[3].first, substreams[3].second);
+  Buffer composite_stream(substreams[4].first, substreams[4].second);
+  Buffer bbox_stream(substreams[5].first, substreams[5].second);
+  Buffer instruction_stream(substreams[6].first, substreams[6].second);
+
+  const uint8_t* overlap_bitmap = nullptr;
+  unsigned int overlap_bitmap_length = 0;
+  if (has_overlap_bitmap) {
+    overlap_bitmap_length = (info->num_glyphs + 7) >> 3;
+    overlap_bitmap = data + offset;
+    if (PREDICT_FALSE(overlap_bitmap_length >
+                           glyf_table->transform_length - offset)) {
+      return FONT_COMPRESSION_FAILURE();
+    }
+  }
+
+  std::vector<uint32_t> loca_values(info->num_glyphs + 1);
+  std::vector<unsigned int> n_points_vec;
+  std::unique_ptr<Point[]> points;
+  size_t points_size = 0;
+  const uint8_t* bbox_bitmap = bbox_stream.buffer();
+  // Safe because num_glyphs is bounded
+  unsigned int bitmap_length = ((info->num_glyphs + 31) >> 5) << 2;
+  if (!bbox_stream.Skip(bitmap_length)) {
+    return FONT_COMPRESSION_FAILURE();
+  }
+
+  // Temp buffer for glyph's.
+  size_t glyph_buf_size = kDefaultGlyphBuf;
+  std::unique_ptr<uint8_t[]> glyph_buf(new uint8_t[glyph_buf_size]);
+
+  info->x_mins.resize(info->num_glyphs);
+  for (unsigned int i = 0; i < info->num_glyphs; ++i) {
+    size_t glyph_size = 0;
+    uint16_t n_contours = 0;
+    bool have_bbox = false;
+    if (bbox_bitmap[i >> 3] & (0x80 >> (i & 7))) {
+      have_bbox = true;
+    }
+    if (PREDICT_FALSE(!n_contour_stream.ReadU16(&n_contours))) {
+      return FONT_COMPRESSION_FAILURE();
+    }
+
+    if (n_contours == 0xffff) {
+      // composite glyph
+      bool have_instructions = false;
+      unsigned int instruction_size = 0;
+      if (PREDICT_FALSE(!have_bbox)) {
+        // composite glyphs must have an explicit bbox
+        return FONT_COMPRESSION_FAILURE();
+      }
+
+      size_t composite_size;
+      if (PREDICT_FALSE(!SizeOfComposite(composite_stream, &composite_size,
+                                         &have_instructions))) {
+        return FONT_COMPRESSION_FAILURE();
+      }
+      if (have_instructions) {
+        if (PREDICT_FALSE(!Read255UShort(&glyph_stream, &instruction_size))) {
+          return FONT_COMPRESSION_FAILURE();
+        }
+      }
+
+      size_t size_needed = 12 + composite_size + instruction_size;
+      if (PREDICT_FALSE(glyph_buf_size < size_needed)) {
+        glyph_buf.reset(new uint8_t[size_needed]);
+        glyph_buf_size = size_needed;
+      }
+
+      glyph_size = Store16(glyph_buf.get(), glyph_size, n_contours);
+      if (PREDICT_FALSE(!bbox_stream.Read(glyph_buf.get() + glyph_size, 8))) {
+        return FONT_COMPRESSION_FAILURE();
+      }
+      glyph_size += 8;
+
+      if (PREDICT_FALSE(!composite_stream.Read(glyph_buf.get() + glyph_size,
+            composite_size))) {
+        return FONT_COMPRESSION_FAILURE();
+      }
+      glyph_size += composite_size;
+      if (have_instructions) {
+        glyph_size = Store16(glyph_buf.get(), glyph_size, instruction_size);
+        if (PREDICT_FALSE(!instruction_stream.Read(glyph_buf.get() + glyph_size,
+              instruction_size))) {
+          return FONT_COMPRESSION_FAILURE();
+        }
+        glyph_size += instruction_size;
+      }
+    } else if (n_contours > 0) {
+      // simple glyph
+      n_points_vec.clear();
+      unsigned int total_n_points = 0;
+      unsigned int n_points_contour;
+      for (unsigned int j = 0; j < n_contours; ++j) {
+        if (PREDICT_FALSE(
+            !Read255UShort(&n_points_stream, &n_points_contour))) {
+          return FONT_COMPRESSION_FAILURE();
+        }
+        n_points_vec.push_back(n_points_contour);
+        if (PREDICT_FALSE(total_n_points + n_points_contour < total_n_points)) {
+          return FONT_COMPRESSION_FAILURE();
+        }
+        total_n_points += n_points_contour;
+      }
+      unsigned int flag_size = total_n_points;
+      if (PREDICT_FALSE(
+          flag_size > flag_stream.length() - flag_stream.offset())) {
+        return FONT_COMPRESSION_FAILURE();
+      }
+      const uint8_t* flags_buf = flag_stream.buffer() + flag_stream.offset();
+      const uint8_t* triplet_buf = glyph_stream.buffer() +
+        glyph_stream.offset();
+      size_t triplet_size = glyph_stream.length() - glyph_stream.offset();
+      size_t triplet_bytes_consumed = 0;
+      if (points_size < total_n_points) {
+        points_size = total_n_points;
+        points.reset(new Point[points_size]);
+      }
+      if (PREDICT_FALSE(!TripletDecode(flags_buf, triplet_buf, triplet_size,
+          total_n_points, points.get(), &triplet_bytes_consumed))) {
+        return FONT_COMPRESSION_FAILURE();
+      }
+      if (PREDICT_FALSE(!flag_stream.Skip(flag_size))) {
+        return FONT_COMPRESSION_FAILURE();
+      }
+      if (PREDICT_FALSE(!glyph_stream.Skip(triplet_bytes_consumed))) {
+        return FONT_COMPRESSION_FAILURE();
+      }
+      unsigned int instruction_size;
+      if (PREDICT_FALSE(!Read255UShort(&glyph_stream, &instruction_size))) {
+        return FONT_COMPRESSION_FAILURE();
+      }
+
+      if (PREDICT_FALSE(total_n_points >= (1 << 27)
+                        || instruction_size >= (1 << 30))) {
+        return FONT_COMPRESSION_FAILURE();
+      }
+      size_t size_needed = 12 + 2 * n_contours + 5 * total_n_points
+                           + instruction_size;
+      if (PREDICT_FALSE(glyph_buf_size < size_needed)) {
+        glyph_buf.reset(new uint8_t[size_needed]);
+        glyph_buf_size = size_needed;
+      }
+
+      glyph_size = Store16(glyph_buf.get(), glyph_size, n_contours);
+      if (have_bbox) {
+        if (PREDICT_FALSE(!bbox_stream.Read(glyph_buf.get() + glyph_size, 8))) {
+          return FONT_COMPRESSION_FAILURE();
+        }
+      } else {
+        ComputeBbox(total_n_points, points.get(), glyph_buf.get());
+      }
+      glyph_size = kEndPtsOfContoursOffset;
+      int end_point = -1;
+      for (unsigned int contour_ix = 0; contour_ix < n_contours; ++contour_ix) {
+        end_point += n_points_vec[contour_ix];
+        if (PREDICT_FALSE(end_point >= 65536)) {
+          return FONT_COMPRESSION_FAILURE();
+        }
+        glyph_size = Store16(glyph_buf.get(), glyph_size, end_point);
+      }
+
+      glyph_size = Store16(glyph_buf.get(), glyph_size, instruction_size);
+      if (PREDICT_FALSE(!instruction_stream.Read(glyph_buf.get() + glyph_size,
+                                                 instruction_size))) {
+        return FONT_COMPRESSION_FAILURE();
+      }
+      glyph_size += instruction_size;
+
+      bool has_overlap_bit =
+          has_overlap_bitmap && overlap_bitmap[i >> 3] & (0x80 >> (i & 7));
+
+      if (PREDICT_FALSE(!StorePoints(
+              total_n_points, points.get(), n_contours, instruction_size,
+              has_overlap_bit, glyph_buf.get(), glyph_buf_size, &glyph_size))) {
+        return FONT_COMPRESSION_FAILURE();
+      }
+    } else {
+      // n_contours == 0; empty glyph. Must NOT have a bbox.
+      if (PREDICT_FALSE(have_bbox)) {
+#ifdef FONT_COMPRESSION_BIN
+        fprintf(stderr, "Empty glyph has a bbox\n");
+#endif
+        return FONT_COMPRESSION_FAILURE();
+      }
+    }
+
+    loca_values[i] = out->Size() - glyf_start;
+    if (PREDICT_FALSE(!out->Write(glyph_buf.get(), glyph_size))) {
+      return FONT_COMPRESSION_FAILURE();
+    }
+
+    // TODO(user) Old code aligned glyphs ... but do we actually need to?
+    if (PREDICT_FALSE(!Pad4(out))) {
+      return FONT_COMPRESSION_FAILURE();
+    }
+
+    *glyf_checksum += ComputeULongSum(glyph_buf.get(), glyph_size);
+
+    // We may need x_min to reconstruct 'hmtx'
+    if (n_contours > 0) {
+      Buffer x_min_buf(glyph_buf.get() + 2, 2);
+      if (PREDICT_FALSE(!x_min_buf.ReadS16(&info->x_mins[i]))) {
+        return FONT_COMPRESSION_FAILURE();
+      }
+    }
+  }
+
+  // glyf_table dst_offset was set by ReconstructFont
+  glyf_table->dst_length = out->Size() - glyf_table->dst_offset;
+  loca_table->dst_offset = out->Size();
+  // loca[n] will be equal the length of the glyph data ('glyf') table
+  loca_values[info->num_glyphs] = glyf_table->dst_length;
+  if (PREDICT_FALSE(!StoreLoca(loca_values, info->index_format, loca_checksum,
+      out))) {
+    return FONT_COMPRESSION_FAILURE();
+  }
+  loca_table->dst_length = out->Size() - loca_table->dst_offset;
+
+  return true;
+}
+
+Table* FindTable(std::vector<Table*>* tables, uint32_t tag) {
+  for (Table* table : *tables) {
+    if (table->tag == tag) {
+      return table;
+    }
+  }
+  return NULL;
+}
+
+// Get numberOfHMetrics, https://www.microsoft.com/typography/otspec/hhea.htm
+bool ReadNumHMetrics(const uint8_t* data, size_t data_size,
+                     uint16_t* num_hmetrics) {
+  // Skip 34 to reach 'hhea' numberOfHMetrics
+  Buffer buffer(data, data_size);
+  if (PREDICT_FALSE(!buffer.Skip(34) || !buffer.ReadU16(num_hmetrics))) {
+    return FONT_COMPRESSION_FAILURE();
+  }
+  return true;
+}
+
+// http://dev.w3.org/webfonts/WOFF2/spec/Overview.html#hmtx_table_format
+bool ReconstructTransformedHmtx(const uint8_t* transformed_buf,
+                                size_t transformed_size,
+                                uint16_t num_glyphs,
+                                uint16_t num_hmetrics,
+                                const std::vector<int16_t>& x_mins,
+                                uint32_t* checksum,
+                                WOFF2Out* out) {
+  Buffer hmtx_buff_in(transformed_buf, transformed_size);
+
+  uint8_t hmtx_flags;
+  if (PREDICT_FALSE(!hmtx_buff_in.ReadU8(&hmtx_flags))) {
+    return FONT_COMPRESSION_FAILURE();
+  }
+
+  std::vector<uint16_t> advance_widths;
+  std::vector<int16_t> lsbs;
+  bool has_proportional_lsbs = (hmtx_flags & 1) == 0;
+  bool has_monospace_lsbs = (hmtx_flags & 2) == 0;
+
+  // Bits 2-7 are reserved and MUST be zero.
+  if ((hmtx_flags & 0xFC) != 0) {
+#ifdef FONT_COMPRESSION_BIN
+    fprintf(stderr, "Illegal hmtx flags; bits 2-7 must be 0\n");
+#endif
+    return FONT_COMPRESSION_FAILURE();
+  }
+
+  // you say you transformed but there is little evidence of it
+  if (has_proportional_lsbs && has_monospace_lsbs) {
+    return FONT_COMPRESSION_FAILURE();
+  }
+
+  assert(x_mins.size() == num_glyphs);
+
+  // num_glyphs 0 is OK if there is no 'glyf' but cannot then xform 'hmtx'.
+  if (PREDICT_FALSE(num_hmetrics > num_glyphs)) {
+    return FONT_COMPRESSION_FAILURE();
+  }
+
+  // https://www.microsoft.com/typography/otspec/hmtx.htm
+  // "...only one entry need be in the array, but that entry is required."
+  if (PREDICT_FALSE(num_hmetrics < 1)) {
+    return FONT_COMPRESSION_FAILURE();
+  }
+
+  for (uint16_t i = 0; i < num_hmetrics; i++) {
+    uint16_t advance_width;
+    if (PREDICT_FALSE(!hmtx_buff_in.ReadU16(&advance_width))) {
+      return FONT_COMPRESSION_FAILURE();
+    }
+    advance_widths.push_back(advance_width);
+  }
+
+  for (uint16_t i = 0; i < num_hmetrics; i++) {
+    int16_t lsb;
+    if (has_proportional_lsbs) {
+      if (PREDICT_FALSE(!hmtx_buff_in.ReadS16(&lsb))) {
+        return FONT_COMPRESSION_FAILURE();
+      }
+    } else {
+      lsb = x_mins[i];
+    }
+    lsbs.push_back(lsb);
+  }
+
+  for (uint16_t i = num_hmetrics; i < num_glyphs; i++) {
+    int16_t lsb;
+    if (has_monospace_lsbs) {
+      if (PREDICT_FALSE(!hmtx_buff_in.ReadS16(&lsb))) {
+        return FONT_COMPRESSION_FAILURE();
+      }
+    } else {
+      lsb = x_mins[i];
+    }
+    lsbs.push_back(lsb);
+  }
+
+  // bake me a shiny new hmtx table
+  uint32_t hmtx_output_size = 2 * num_glyphs + 2 * num_hmetrics;
+  std::vector<uint8_t> hmtx_table(hmtx_output_size);
+  uint8_t* dst = &hmtx_table[0];
+  size_t dst_offset = 0;
+  for (uint32_t i = 0; i < num_glyphs; i++) {
+    if (i < num_hmetrics) {
+      Store16(advance_widths[i], &dst_offset, dst);
+    }
+    Store16(lsbs[i], &dst_offset, dst);
+  }
+
+  *checksum = ComputeULongSum(&hmtx_table[0], hmtx_output_size);
+  if (PREDICT_FALSE(!out->Write(&hmtx_table[0], hmtx_output_size))) {
+    return FONT_COMPRESSION_FAILURE();
+  }
+
+  return true;
+}
+
+bool Woff2Uncompress(uint8_t* dst_buf, size_t dst_size,
+  const uint8_t* src_buf, size_t src_size) {
+  size_t uncompressed_size = dst_size;
+  BrotliDecoderResult result = RLBoxBrotliDecoderDecompress(
+      src_size, src_buf, &uncompressed_size, dst_buf);
+  if (PREDICT_FALSE(result != BROTLI_DECODER_RESULT_SUCCESS ||
+                    uncompressed_size != dst_size)) {
+    return FONT_COMPRESSION_FAILURE();
+  }
+  return true;
+}
+
+bool ReadTableDirectory(Buffer* file, std::vector<Table>* tables,
+    size_t num_tables) {
+  uint32_t src_offset = 0;
+  for (size_t i = 0; i < num_tables; ++i) {
+    Table* table = &(*tables)[i];
+    uint8_t flag_byte;
+    if (PREDICT_FALSE(!file->ReadU8(&flag_byte))) {
+      return FONT_COMPRESSION_FAILURE();
+    }
+    uint32_t tag;
+    if ((flag_byte & 0x3f) == 0x3f) {
+      if (PREDICT_FALSE(!file->ReadU32(&tag))) {
+        return FONT_COMPRESSION_FAILURE();
+      }
+    } else {
+      tag = kKnownTags[flag_byte & 0x3f];
+    }
+    uint32_t flags = 0;
+    uint8_t xform_version = (flag_byte >> 6) & 0x03;
+
+    // 0 means xform for glyph/loca, non-0 for others
+    if (tag == kGlyfTableTag || tag == kLocaTableTag) {
+      if (xform_version == 0) {
+        flags |= kWoff2FlagsTransform;
+      }
+    } else if (xform_version != 0) {
+      flags |= kWoff2FlagsTransform;
+    }
+    flags |= xform_version;
+
+    uint32_t dst_length;
+    if (PREDICT_FALSE(!ReadBase128(file, &dst_length))) {
+      return FONT_COMPRESSION_FAILURE();
+    }
+    uint32_t transform_length = dst_length;
+    if ((flags & kWoff2FlagsTransform) != 0) {
+      if (PREDICT_FALSE(!ReadBase128(file, &transform_length))) {
+        return FONT_COMPRESSION_FAILURE();
+      }
+      if (PREDICT_FALSE(tag == kLocaTableTag && transform_length)) {
+        return FONT_COMPRESSION_FAILURE();
+      }
+    }
+    if (PREDICT_FALSE(src_offset + transform_length < src_offset)) {
+      return FONT_COMPRESSION_FAILURE();
+    }
+    table->src_offset = src_offset;
+    table->src_length = transform_length;
+    src_offset += transform_length;
+
+    table->tag = tag;
+    table->flags = flags;
+    table->transform_length = transform_length;
+    table->dst_length = dst_length;
+  }
+  return true;
+}
+
+// Writes a single Offset Table entry
+size_t StoreOffsetTable(uint8_t* result, size_t offset, uint32_t flavor,
+                        uint16_t num_tables) {
+  offset = StoreU32(result, offset, flavor);  // sfnt version
+  offset = Store16(result, offset, num_tables);  // num_tables
+  unsigned max_pow2 = 0;
+  while (1u << (max_pow2 + 1) <= num_tables) {
+    max_pow2++;
+  }
+  const uint16_t output_search_range = (1u << max_pow2) << 4;
+  offset = Store16(result, offset, output_search_range);  // searchRange
+  offset = Store16(result, offset, max_pow2);  // entrySelector
+  // rangeShift
+  offset = Store16(result, offset, (num_tables << 4) - output_search_range);
+  return offset;
+}
+
+size_t StoreTableEntry(uint8_t* result, uint32_t offset, uint32_t tag) {
+  offset = StoreU32(result, offset, tag);
+  offset = StoreU32(result, offset, 0);
+  offset = StoreU32(result, offset, 0);
+  offset = StoreU32(result, offset, 0);
+  return offset;
+}
+
+// First table goes after all the headers, table directory, etc
+uint64_t ComputeOffsetToFirstTable(const WOFF2Header& hdr) {
+  uint64_t offset = kSfntHeaderSize +
+    kSfntEntrySize * static_cast<uint64_t>(hdr.num_tables);
+  if (hdr.header_version) {
+    offset = CollectionHeaderSize(hdr.header_version, hdr.ttc_fonts.size())
+      + kSfntHeaderSize * hdr.ttc_fonts.size();
+    for (const auto& ttc_font : hdr.ttc_fonts) {
+      offset += kSfntEntrySize * ttc_font.table_indices.size();
+    }
+  }
+  return offset;
+}
+
+std::vector<Table*> Tables(WOFF2Header* hdr, size_t font_index) {
+  std::vector<Table*> tables;
+  if (PREDICT_FALSE(hdr->header_version)) {
+    for (auto index : hdr->ttc_fonts[font_index].table_indices) {
+      tables.push_back(&hdr->tables[index]);
+    }
+  } else {
+    for (auto& table : hdr->tables) {
+      tables.push_back(&table);
+    }
+  }
+  return tables;
+}
+
+// Offset tables assumed to have been written in with 0's initially.
+// WOFF2Header isn't const so we can use [] instead of at() (which upsets FF)
+bool ReconstructFont(uint8_t* transformed_buf,
+                     const uint32_t transformed_buf_size,
+                     RebuildMetadata* metadata,
+                     WOFF2Header* hdr,
+                     size_t font_index,
+                     WOFF2Out* out) {
+  size_t dest_offset = out->Size();
+  uint8_t table_entry[12];
+  WOFF2FontInfo* info = &metadata->font_infos[font_index];
+  std::vector<Table*> tables = Tables(hdr, font_index);
+
+  // 'glyf' without 'loca' doesn't make sense
+  const Table* glyf_table = FindTable(&tables, kGlyfTableTag);
+  const Table* loca_table = FindTable(&tables, kLocaTableTag);
+  if (PREDICT_FALSE(static_cast<bool>(glyf_table) !=
+                    static_cast<bool>(loca_table))) {
+#ifdef FONT_COMPRESSION_BIN
+      fprintf(stderr, "Cannot have just one of glyf/loca\n");
+#endif
+    return FONT_COMPRESSION_FAILURE();
+  }
+
+  if (glyf_table != NULL) {
+    if (PREDICT_FALSE((glyf_table->flags & kWoff2FlagsTransform)
+                      != (loca_table->flags & kWoff2FlagsTransform))) {
+#ifdef FONT_COMPRESSION_BIN
+      fprintf(stderr, "Cannot transform just one of glyf/loca\n");
+#endif
+      return FONT_COMPRESSION_FAILURE();
+    }
+  }
+
+  uint32_t font_checksum = metadata->header_checksum;
+  if (hdr->header_version) {
+    font_checksum = hdr->ttc_fonts[font_index].header_checksum;
+  }
+
+  uint32_t loca_checksum = 0;
+  for (size_t i = 0; i < tables.size(); i++) {
+    Table& table = *tables[i];
+
+    std::pair<uint32_t, uint32_t> checksum_key = {table.tag, table.src_offset};
+    bool reused = metadata->checksums.find(checksum_key)
+               != metadata->checksums.end();
+    if (PREDICT_FALSE(font_index == 0 && reused)) {
+      return FONT_COMPRESSION_FAILURE();
+    }
+
+    // TODO(user) a collection with optimized hmtx that reused glyf/loca
+    // would fail. We don't optimize hmtx for collections yet.
+    if (PREDICT_FALSE(static_cast<uint64_t>(table.src_offset) + table.src_length
+        > transformed_buf_size)) {
+      return FONT_COMPRESSION_FAILURE();
+    }
+
+    if (table.tag == kHheaTableTag) {
+      if (!ReadNumHMetrics(transformed_buf + table.src_offset,
+          table.src_length, &info->num_hmetrics)) {
+        return FONT_COMPRESSION_FAILURE();
+      }
+    }
+
+    uint32_t checksum = 0;
+    if (!reused) {
+      if ((table.flags & kWoff2FlagsTransform) != kWoff2FlagsTransform) {
+        if (table.tag == kHeadTableTag) {
+          if (PREDICT_FALSE(table.src_length < 12)) {
+            return FONT_COMPRESSION_FAILURE();
+          }
+          // checkSumAdjustment = 0
+          StoreU32(transformed_buf + table.src_offset, 8, 0);
+        }
+        table.dst_offset = dest_offset;
+        checksum = ComputeULongSum(transformed_buf + table.src_offset,
+                                   table.src_length);
+        if (PREDICT_FALSE(!out->Write(transformed_buf + table.src_offset,
+            table.src_length))) {
+          return FONT_COMPRESSION_FAILURE();
+        }
+      } else {
+        if (table.tag == kGlyfTableTag) {
+          table.dst_offset = dest_offset;
+
+          Table* loca_table = FindTable(&tables, kLocaTableTag);
+          if (PREDICT_FALSE(!ReconstructGlyf(transformed_buf + table.src_offset,
+              &table, &checksum, loca_table, &loca_checksum, info, out))) {
+            return FONT_COMPRESSION_FAILURE();
+          }
+        } else if (table.tag == kLocaTableTag) {
+          // All the work was done by ReconstructGlyf. We already know checksum.
+          checksum = loca_checksum;
+        } else if (table.tag == kHmtxTableTag) {
+          table.dst_offset = dest_offset;
+          // Tables are sorted so all the info we need has been gathered.
+          if (PREDICT_FALSE(!ReconstructTransformedHmtx(
+              transformed_buf + table.src_offset, table.src_length,
+              info->num_glyphs, info->num_hmetrics, info->x_mins, &checksum,
+              out))) {
+            return FONT_COMPRESSION_FAILURE();
+          }
+        } else {
+          return FONT_COMPRESSION_FAILURE();  // transform unknown
+        }
+      }
+      metadata->checksums[checksum_key] = checksum;
+    } else {
+      checksum = metadata->checksums[checksum_key];
+    }
+    font_checksum += checksum;
+
+    // update the table entry with real values.
+    StoreU32(table_entry, 0, checksum);
+    StoreU32(table_entry, 4, table.dst_offset);
+    StoreU32(table_entry, 8, table.dst_length);
+    if (PREDICT_FALSE(!out->Write(table_entry,
+        info->table_entry_by_tag[table.tag] + 4, 12))) {
+      return FONT_COMPRESSION_FAILURE();
+    }
+
+    // We replaced 0's. Update overall checksum.
+    font_checksum += ComputeULongSum(table_entry, 12);
+
+    if (PREDICT_FALSE(!Pad4(out))) {
+      return FONT_COMPRESSION_FAILURE();
+    }
+
+    if (PREDICT_FALSE(static_cast<uint64_t>(table.dst_offset + table.dst_length)
+        > out->Size())) {
+      return FONT_COMPRESSION_FAILURE();
+    }
+    dest_offset = out->Size();
+  }
+
+  // Update 'head' checkSumAdjustment. We already set it to 0 and summed font.
+  Table* head_table = FindTable(&tables, kHeadTableTag);
+  if (head_table) {
+    if (PREDICT_FALSE(head_table->dst_length < 12)) {
+      return FONT_COMPRESSION_FAILURE();
+    }
+    uint8_t checksum_adjustment[4];
+    StoreU32(checksum_adjustment, 0, 0xB1B0AFBA - font_checksum);
+    if (PREDICT_FALSE(!out->Write(checksum_adjustment,
+                                  head_table->dst_offset + 8, 4))) {
+      return FONT_COMPRESSION_FAILURE();
+    }
+  }
+
+  return true;
+}
+
+bool ReadWOFF2Header(const uint8_t* data, size_t length, WOFF2Header* hdr) {
+  Buffer file(data, length);
+
+  uint32_t signature;
+  if (PREDICT_FALSE(!file.ReadU32(&signature) || signature != kWoff2Signature ||
+      !file.ReadU32(&hdr->flavor))) {
+    return FONT_COMPRESSION_FAILURE();
+  }
+
+  // TODO(user): Should call IsValidVersionTag() here.
+
+  uint32_t reported_length;
+  if (PREDICT_FALSE(
+      !file.ReadU32(&reported_length) || length != reported_length)) {
+    return FONT_COMPRESSION_FAILURE();
+  }
+  if (PREDICT_FALSE(!file.ReadU16(&hdr->num_tables) || !hdr->num_tables)) {
+    return FONT_COMPRESSION_FAILURE();
+  }
+
+  // We don't care about these fields of the header:
+  //   uint16_t reserved
+  //   uint32_t total_sfnt_size, we don't believe this, will compute later
+  if (PREDICT_FALSE(!file.Skip(6))) {
+    return FONT_COMPRESSION_FAILURE();
+  }
+  if (PREDICT_FALSE(!file.ReadU32(&hdr->compressed_length))) {
+    return FONT_COMPRESSION_FAILURE();
+  }
+  // We don't care about these fields of the header:
+  //   uint16_t major_version, minor_version
+  if (PREDICT_FALSE(!file.Skip(2 * 2))) {
+    return FONT_COMPRESSION_FAILURE();
+  }
+  uint32_t meta_offset;
+  uint32_t meta_length;
+  uint32_t meta_length_orig;
+  if (PREDICT_FALSE(!file.ReadU32(&meta_offset) ||
+      !file.ReadU32(&meta_length) ||
+      !file.ReadU32(&meta_length_orig))) {
+    return FONT_COMPRESSION_FAILURE();
+  }
+  if (meta_offset) {
+    if (PREDICT_FALSE(
+        meta_offset >= length || length - meta_offset < meta_length)) {
+      return FONT_COMPRESSION_FAILURE();
+    }
+  }
+  uint32_t priv_offset;
+  uint32_t priv_length;
+  if (PREDICT_FALSE(!file.ReadU32(&priv_offset) ||
+      !file.ReadU32(&priv_length))) {
+    return FONT_COMPRESSION_FAILURE();
+  }
+  if (priv_offset) {
+    if (PREDICT_FALSE(
+        priv_offset >= length || length - priv_offset < priv_length)) {
+      return FONT_COMPRESSION_FAILURE();
+    }
+  }
+  hdr->tables.resize(hdr->num_tables);
+  if (PREDICT_FALSE(!ReadTableDirectory(
+          &file, &hdr->tables, hdr->num_tables))) {
+    return FONT_COMPRESSION_FAILURE();
+  }
+
+  // Before we sort for output the last table end is the uncompressed size.
+  Table& last_table = hdr->tables.back();
+  hdr->uncompressed_size = last_table.src_offset + last_table.src_length;
+  if (PREDICT_FALSE(hdr->uncompressed_size < last_table.src_offset)) {
+    return FONT_COMPRESSION_FAILURE();
+  }
+
+  hdr->header_version = 0;
+
+  if (hdr->flavor == kTtcFontFlavor) {
+    if (PREDICT_FALSE(!file.ReadU32(&hdr->header_version))) {
+      return FONT_COMPRESSION_FAILURE();
+    }
+    if (PREDICT_FALSE(hdr->header_version != 0x00010000
+                   && hdr->header_version != 0x00020000)) {
+      return FONT_COMPRESSION_FAILURE();
+    }
+    uint32_t num_fonts;
+    if (PREDICT_FALSE(!Read255UShort(&file, &num_fonts) || !num_fonts)) {
+      return FONT_COMPRESSION_FAILURE();
+    }
+    hdr->ttc_fonts.resize(num_fonts);
+
+    for (uint32_t i = 0; i < num_fonts; i++) {
+      TtcFont& ttc_font = hdr->ttc_fonts[i];
+      uint32_t num_tables;
+      if (PREDICT_FALSE(!Read255UShort(&file, &num_tables) || !num_tables)) {
+        return FONT_COMPRESSION_FAILURE();
+      }
+      if (PREDICT_FALSE(!file.ReadU32(&ttc_font.flavor))) {
+        return FONT_COMPRESSION_FAILURE();
+      }
+
+      ttc_font.table_indices.resize(num_tables);
+
+
+      unsigned int glyf_idx = 0;
+      unsigned int loca_idx = 0;
+
+      for (uint32_t j = 0; j < num_tables; j++) {
+        unsigned int table_idx;
+        if (PREDICT_FALSE(!Read255UShort(&file, &table_idx)) ||
+            table_idx >= hdr->tables.size()) {
+          return FONT_COMPRESSION_FAILURE();
+        }
+        ttc_font.table_indices[j] = table_idx;
+
+        const Table& table = hdr->tables[table_idx];
+        if (table.tag == kLocaTableTag) {
+          loca_idx = table_idx;
+        }
+        if (table.tag == kGlyfTableTag) {
+          glyf_idx = table_idx;
+        }
+
+      }
+
+      // if we have both glyf and loca make sure they are consecutive
+      // if we have just one we'll reject the font elsewhere
+      if (glyf_idx > 0 || loca_idx > 0) {
+        if (PREDICT_FALSE(glyf_idx > loca_idx || loca_idx - glyf_idx != 1)) {
+#ifdef FONT_COMPRESSION_BIN
+        fprintf(stderr, "TTC font %d has non-consecutive glyf/loca\n", i);
+#endif
+          return FONT_COMPRESSION_FAILURE();
+        }
+      }
+    }
+  }
+
+  const uint64_t first_table_offset = ComputeOffsetToFirstTable(*hdr);
+
+  hdr->compressed_offset = file.offset();
+  if (PREDICT_FALSE(hdr->compressed_offset >
+                    std::numeric_limits<uint32_t>::max())) {
+    return FONT_COMPRESSION_FAILURE();
+  }
+  uint64_t src_offset = Round4(hdr->compressed_offset + hdr->compressed_length);
+  uint64_t dst_offset = first_table_offset;
+
+
+  if (PREDICT_FALSE(src_offset > length)) {
+#ifdef FONT_COMPRESSION_BIN
+    fprintf(stderr, "offset fail; src_offset %" PRIu64 " length %lu "
+      "dst_offset %" PRIu64 "\n",
+      src_offset, length, dst_offset);
+#endif
+    return FONT_COMPRESSION_FAILURE();
+  }
+  if (meta_offset) {
+    if (PREDICT_FALSE(src_offset != meta_offset)) {
+      return FONT_COMPRESSION_FAILURE();
+    }
+    src_offset = Round4(meta_offset + meta_length);
+    if (PREDICT_FALSE(src_offset > std::numeric_limits<uint32_t>::max())) {
+      return FONT_COMPRESSION_FAILURE();
+    }
+  }
+
+  if (priv_offset) {
+    if (PREDICT_FALSE(src_offset != priv_offset)) {
+      return FONT_COMPRESSION_FAILURE();
+    }
+    src_offset = Round4(priv_offset + priv_length);
+    if (PREDICT_FALSE(src_offset > std::numeric_limits<uint32_t>::max())) {
+      return FONT_COMPRESSION_FAILURE();
+    }
+  }
+
+  if (PREDICT_FALSE(src_offset != Round4(length))) {
+    return FONT_COMPRESSION_FAILURE();
+  }
+
+  return true;
+}
+
+// Write everything before the actual table data
+bool WriteHeaders(const uint8_t* data, size_t length, RebuildMetadata* metadata,
+                  WOFF2Header* hdr, WOFF2Out* out) {
+  std::vector<uint8_t> output(ComputeOffsetToFirstTable(*hdr), 0);
+
+  // Re-order tables in output (OTSpec) order
+  std::vector<Table> sorted_tables(hdr->tables);
+  if (hdr->header_version) {
+    // collection; we have to sort the table offset vector in each font
+    for (auto& ttc_font : hdr->ttc_fonts) {
+      std::map<uint32_t, uint16_t> sorted_index_by_tag;
+      for (auto table_index : ttc_font.table_indices) {
+        sorted_index_by_tag[hdr->tables[table_index].tag] = table_index;
+      }
+      uint16_t index = 0;
+      for (auto& i : sorted_index_by_tag) {
+        ttc_font.table_indices[index++] = i.second;
+      }
+    }
+  } else {
+    // non-collection; we can just sort the tables
+    std::sort(sorted_tables.begin(), sorted_tables.end());
+  }
+
+  // Start building the font
+  uint8_t* result = &output[0];
+  size_t offset = 0;
+  if (hdr->header_version) {
+    // TTC header
+    offset = StoreU32(result, offset, hdr->flavor);  // TAG TTCTag
+    offset = StoreU32(result, offset, hdr->header_version);  // FIXED Version
+    offset = StoreU32(result, offset, hdr->ttc_fonts.size());  // ULONG numFonts
+    // Space for ULONG OffsetTable[numFonts] (zeroed initially)
+    size_t offset_table = offset;  // keep start of offset table for later
+    for (size_t i = 0; i < hdr->ttc_fonts.size(); i++) {
+      offset = StoreU32(result, offset, 0);  // will fill real values in later
+    }
+    // space for DSIG fields for header v2
+    if (hdr->header_version == 0x00020000) {
+      offset = StoreU32(result, offset, 0);  // ULONG ulDsigTag
+      offset = StoreU32(result, offset, 0);  // ULONG ulDsigLength
+      offset = StoreU32(result, offset, 0);  // ULONG ulDsigOffset
+    }
+
+    // write Offset Tables and store the location of each in TTC Header
+    metadata->font_infos.resize(hdr->ttc_fonts.size());
+    for (size_t i = 0; i < hdr->ttc_fonts.size(); i++) {
+      TtcFont& ttc_font = hdr->ttc_fonts[i];
+
+      // write Offset Table location into TTC Header
+      offset_table = StoreU32(result, offset_table, offset);
+
+      // write the actual offset table so our header doesn't lie
+      ttc_font.dst_offset = offset;
+      offset = StoreOffsetTable(result, offset, ttc_font.flavor,
+                                ttc_font.table_indices.size());
+
+      for (const auto table_index : ttc_font.table_indices) {
+        uint32_t tag = hdr->tables[table_index].tag;
+        metadata->font_infos[i].table_entry_by_tag[tag] = offset;
+        offset = StoreTableEntry(result, offset, tag);
+      }
+
+      ttc_font.header_checksum = ComputeULongSum(&output[ttc_font.dst_offset],
+                                                 offset - ttc_font.dst_offset);
+    }
+  } else {
+    metadata->font_infos.resize(1);
+    offset = StoreOffsetTable(result, offset, hdr->flavor, hdr->num_tables);
+    for (uint16_t i = 0; i < hdr->num_tables; ++i) {
+      metadata->font_infos[0].table_entry_by_tag[sorted_tables[i].tag] = offset;
+      offset = StoreTableEntry(result, offset, sorted_tables[i].tag);
+    }
+  }
+
+  if (PREDICT_FALSE(!out->Write(&output[0], output.size()))) {
+    return FONT_COMPRESSION_FAILURE();
+  }
+  metadata->header_checksum = ComputeULongSum(&output[0], output.size());
+  return true;
+}
+
+}  // namespace
+
+size_t ComputeWOFF2FinalSize(const uint8_t* data, size_t length) {
+  Buffer file(data, length);
+  uint32_t total_length;
+
+  if (!file.Skip(16) ||
+      !file.ReadU32(&total_length)) {
+    return 0;
+  }
+  return total_length;
+}
+
+bool ConvertWOFF2ToTTF(uint8_t *result, size_t result_length,
+                       const uint8_t *data, size_t length) {
+  WOFF2MemoryOut out(result, result_length);
+  return ConvertWOFF2ToTTF(data, length, &out);
+}
+
+bool ConvertWOFF2ToTTF(const uint8_t* data, size_t length,
+                       WOFF2Out* out) {
+  RebuildMetadata metadata;
+  WOFF2Header hdr;
+  if (!ReadWOFF2Header(data, length, &hdr)) {
+    return FONT_COMPRESSION_FAILURE();
+  }
+
+  if (!WriteHeaders(data, length, &metadata, &hdr, out)) {
+    return FONT_COMPRESSION_FAILURE();
+  }
+
+  const float compression_ratio = (float) hdr.uncompressed_size / length;
+  if (compression_ratio > kMaxPlausibleCompressionRatio) {
+#ifdef FONT_COMPRESSION_BIN
+    fprintf(stderr, "Implausible compression ratio %.01f\n", compression_ratio);
+#endif
+    return FONT_COMPRESSION_FAILURE();
+  }
+
+  const uint8_t* src_buf = data + hdr.compressed_offset;
+  std::vector<uint8_t> uncompressed_buf(hdr.uncompressed_size);
+  if (PREDICT_FALSE(hdr.uncompressed_size < 1)) {
+    return FONT_COMPRESSION_FAILURE();
+  }
+  if (PREDICT_FALSE(!Woff2Uncompress(&uncompressed_buf[0],
+                                     hdr.uncompressed_size, src_buf,
+                                     hdr.compressed_length))) {
+    return FONT_COMPRESSION_FAILURE();
+  }
+
+  for (size_t i = 0; i < metadata.font_infos.size(); i++) {
+    if (PREDICT_FALSE(!ReconstructFont(&uncompressed_buf[0],
+                                       hdr.uncompressed_size,
+                                       &metadata, &hdr, i, out))) {
+      return FONT_COMPRESSION_FAILURE();
+    }
+  }
+
+  return true;
+}
+
+} // namespace woff2
diff --git a/modules/woff2/src/woff2_decompress.cc b/modules/woff2/src/woff2_decompress.cc
new file mode 100644
index 0000000000..47394781ad
--- /dev/null
+++ b/modules/woff2/src/woff2_decompress.cc
@@ -0,0 +1,41 @@
+/* Copyright 2013 Google Inc. All Rights Reserved.
+
+   Distributed under MIT license.
+   See file LICENSE for detail or copy at https://opensource.org/licenses/MIT
+*/
+
+/* A very simple commandline tool for decompressing woff2 format files to true
+   type font files. */
+
+#include <string>
+
+#include "./file.h"
+#include <woff2/decode.h>
+
+
+int main(int argc, char **argv) {
+  if (argc != 2) {
+    fprintf(stderr, "One argument, the input filename, must be provided.\n");
+    return 1;
+  }
+
+  std::string filename(argv[1]);
+  std::string outfilename = filename.substr(0, filename.find_last_of(".")) + ".ttf";
+
+  // Note: update woff2_dec_fuzzer_new_entry.cc if this pattern changes.
+  std::string input = woff2::GetFileContent(filename);
+  const uint8_t* raw_input = reinterpret_cast<const uint8_t*>(input.data());
+  std::string output(
+      std::min(woff2::ComputeWOFF2FinalSize(raw_input, input.size()),
+               woff2::kDefaultMaxSize),
+      0);
+  woff2::WOFF2StringOut out(&output);
+
+  const bool ok = woff2::ConvertWOFF2ToTTF(raw_input, input.size(), &out);
+
+  if (ok) {
+    woff2::SetFileContents(outfilename, output.begin(),
+        output.begin() + out.Size());
+  }
+  return ok ? 0 : 1;
+}
diff --git a/modules/woff2/src/woff2_enc.cc b/modules/woff2/src/woff2_enc.cc
new file mode 100644
index 0000000000..f3f46e5759
--- /dev/null
+++ b/modules/woff2/src/woff2_enc.cc
@@ -0,0 +1,458 @@
+/* Copyright 2014 Google Inc. All Rights Reserved.
+
+   Distributed under MIT license.
+   See file LICENSE for detail or copy at https://opensource.org/licenses/MIT
+*/
+
+/* Library for converting TTF format font files to their WOFF2 versions. */
+
+#include <woff2/encode.h>
+
+#include <stdlib.h>
+#include <complex>
+#include <cstring>
+#include <limits>
+#include <string>
+#include <vector>
+
+#include <brotli/encode.h>
+#include "./buffer.h"
+#include "./font.h"
+#include "./normalize.h"
+#include "./round.h"
+#include "./store_bytes.h"
+#include "./table_tags.h"
+#include "./transform.h"
+#include "./variable_length.h"
+#include "./woff2_common.h"
+
+namespace woff2 {
+
+
+namespace {
+
+const size_t kWoff2HeaderSize = 48;
+const size_t kWoff2EntrySize = 20;
+
+bool Compress(const uint8_t* data, const size_t len, uint8_t* result,
+              uint32_t* result_len, BrotliEncoderMode mode, int quality) {
+  size_t compressed_len = *result_len;
+  if (BrotliEncoderCompress(quality, BROTLI_DEFAULT_WINDOW, mode, len, data,
+                            &compressed_len, result) == 0) {
+    return false;
+  }
+  *result_len = compressed_len;
+  return true;
+}
+
+bool Woff2Compress(const uint8_t* data, const size_t len,
+                   uint8_t* result, uint32_t* result_len,
+                   int quality) {
+  return Compress(data, len, result, result_len,
+                  BROTLI_MODE_FONT, quality);
+}
+
+bool TextCompress(const uint8_t* data, const size_t len,
+                  uint8_t* result, uint32_t* result_len,
+                  int quality) {
+  return Compress(data, len, result, result_len,
+                  BROTLI_MODE_TEXT, quality);
+}
+
+int KnownTableIndex(uint32_t tag) {
+  for (int i = 0; i < 63; ++i) {
+    if (tag == kKnownTags[i]) return i;
+  }
+  return 63;
+}
+
+void StoreTableEntry(const Table& table, size_t* offset, uint8_t* dst) {
+  uint8_t flag_byte = (table.flags & 0xC0) | KnownTableIndex(table.tag);
+  dst[(*offset)++] = flag_byte;
+  // The index here is treated as a set of flag bytes because
+  // bits 6 and 7 of the byte are reserved for future use as flags.
+  // 0x3f or 63 means an arbitrary table tag.
+  if ((flag_byte & 0x3f) == 0x3f) {
+    StoreU32(table.tag, offset, dst);
+  }
+  StoreBase128(table.src_length, offset, dst);
+  if ((table.flags & kWoff2FlagsTransform) != 0) {
+    StoreBase128(table.transform_length, offset, dst);
+  }
+}
+
+size_t TableEntrySize(const Table& table) {
+  uint8_t flag_byte = KnownTableIndex(table.tag);
+  size_t size = ((flag_byte & 0x3f) != 0x3f) ? 1 : 5;
+  size += Base128Size(table.src_length);
+  if ((table.flags & kWoff2FlagsTransform) != 0) {
+     size += Base128Size(table.transform_length);
+  }
+  return size;
+}
+
+size_t ComputeWoff2Length(const FontCollection& font_collection,
+                          const std::vector<Table>& tables,
+                          std::map<std::pair<uint32_t, uint32_t>, uint16_t>
+                            index_by_tag_offset,
+                          size_t compressed_data_length,
+                          size_t extended_metadata_length) {
+  size_t size = kWoff2HeaderSize;
+
+  for (const auto& table : tables) {
+    size += TableEntrySize(table);
+  }
+
+  // for collections only, collection tables
+  if (font_collection.flavor == kTtcFontFlavor) {
+    size += 4;  // UInt32 Version of TTC Header
+    size += Size255UShort(font_collection.fonts.size());  // 255UInt16 numFonts
+
+    size += 4 * font_collection.fonts.size();  // UInt32 flavor for each
+
+    for (const auto& font : font_collection.fonts) {
+      size += Size255UShort(font.tables.size());  // 255UInt16 numTables
+      for (const auto& entry : font.tables) {
+        const Font::Table& table = entry.second;
+        // no collection entry for xform table
+        if (table.tag & 0x80808080) continue;
+
+        std::pair<uint32_t, uint32_t> tag_offset(table.tag, table.offset);
+        uint16_t table_index = index_by_tag_offset[tag_offset];
+        size += Size255UShort(table_index);  // 255UInt16 index entry
+      }
+    }
+  }
+
+  // compressed data
+  size += compressed_data_length;
+  size = Round4(size);
+
+  size += extended_metadata_length;
+  return size;
+}
+
+size_t ComputeUncompressedLength(const Font& font) {
+  // sfnt header + offset table
+  size_t size = 12 + 16 * font.num_tables;
+  for (const auto& entry : font.tables) {
+    const Font::Table& table = entry.second;
+    if (table.tag & 0x80808080) continue;  // xform tables don't stay
+    if (table.IsReused()) continue;  // don't have to pay twice
+    size += Round4(table.length);
+  }
+  return size;
+}
+
+size_t ComputeUncompressedLength(const FontCollection& font_collection) {
+  if (font_collection.flavor != kTtcFontFlavor) {
+    return ComputeUncompressedLength(font_collection.fonts[0]);
+  }
+  size_t size = CollectionHeaderSize(font_collection.header_version,
+    font_collection.fonts.size());
+  for (const auto& font : font_collection.fonts) {
+    size += ComputeUncompressedLength(font);
+  }
+  return size;
+}
+
+size_t ComputeTotalTransformLength(const Font& font) {
+  size_t total = 0;
+  for (const auto& i : font.tables) {
+    const Font::Table& table = i.second;
+    if (table.IsReused()) {
+      continue;
+    }
+    if (table.tag & 0x80808080 || !font.FindTable(table.tag ^ 0x80808080)) {
+      // Count transformed tables and non-transformed tables that do not have
+      // transformed versions.
+      total += table.length;
+    }
+  }
+  return total;
+}
+
+}  // namespace
+
+size_t MaxWOFF2CompressedSize(const uint8_t* data, size_t length) {
+  return MaxWOFF2CompressedSize(data, length, "");
+}
+
+size_t MaxWOFF2CompressedSize(const uint8_t* data, size_t length,
+                              const std::string& extended_metadata) {
+  // Except for the header size, which is 32 bytes larger in woff2 format,
+  // all other parts should be smaller (table header in short format,
+  // transformations and compression). Just to be sure, we will give some
+  // headroom anyway.
+  return length + 1024 + extended_metadata.length();
+}
+
+uint32_t CompressedBufferSize(uint32_t original_size) {
+  return 1.2 * original_size + 10240;
+}
+
+bool TransformFontCollection(FontCollection* font_collection) {
+  for (auto& font : font_collection->fonts) {
+    if (!TransformGlyfAndLocaTables(&font)) {
+#ifdef FONT_COMPRESSION_BIN
+      fprintf(stderr, "glyf/loca transformation failed.\n");
+#endif
+      return FONT_COMPRESSION_FAILURE();
+    }
+  }
+
+  return true;
+}
+
+bool ConvertTTFToWOFF2(const uint8_t *data, size_t length,
+                       uint8_t *result, size_t *result_length) {
+  WOFF2Params params;
+  return ConvertTTFToWOFF2(data, length, result, result_length,
+                           params);
+}
+
+bool ConvertTTFToWOFF2(const uint8_t *data, size_t length,
+                       uint8_t *result, size_t *result_length,
+                       const WOFF2Params& params) {
+  FontCollection font_collection;
+  if (!ReadFontCollection(data, length, &font_collection)) {
+#ifdef FONT_COMPRESSION_BIN
+    fprintf(stderr, "Parsing of the input font failed.\n");
+#endif
+    return FONT_COMPRESSION_FAILURE();
+  }
+
+  if (!NormalizeFontCollection(&font_collection)) {
+    return FONT_COMPRESSION_FAILURE();
+  }
+
+  if (params.allow_transforms && !TransformFontCollection(&font_collection)) {
+    return FONT_COMPRESSION_FAILURE();
+  } else {
+    // glyf/loca use 11 to flag "not transformed"
+    for (auto& font : font_collection.fonts) {
+      Font::Table* glyf_table = font.FindTable(kGlyfTableTag);
+      Font::Table* loca_table = font.FindTable(kLocaTableTag);
+      if (glyf_table) {
+        glyf_table->flag_byte |= 0xc0;
+      }
+      if (loca_table) {
+        loca_table->flag_byte |= 0xc0;
+      }
+    }
+  }
+
+  // Although the compressed size of each table in the final woff2 file won't
+  // be larger than its transform_length, we have to allocate a large enough
+  // buffer for the compressor, since the compressor can potentially increase
+  // the size. If the compressor overflows this, it should return false and
+  // then this function will also return false.
+
+  size_t total_transform_length = 0;
+  for (const auto& font : font_collection.fonts) {
+    total_transform_length += ComputeTotalTransformLength(font);
+  }
+  size_t compression_buffer_size = CompressedBufferSize(total_transform_length);
+  std::vector<uint8_t> compression_buf(compression_buffer_size);
+  uint32_t total_compressed_length = compression_buffer_size;
+
+  // Collect all transformed data into one place in output order.
+  std::vector<uint8_t> transform_buf(total_transform_length);
+  size_t transform_offset = 0;
+  for (const auto& font : font_collection.fonts) {
+    for (const auto tag : font.OutputOrderedTags()) {
+      const Font::Table& original = font.tables.at(tag);
+      if (original.IsReused()) continue;
+      if (tag & 0x80808080) continue;
+      const Font::Table* table_to_store = font.FindTable(tag ^ 0x80808080);
+      if (table_to_store == NULL) table_to_store = &original;
+
+      StoreBytes(table_to_store->data, table_to_store->length,
+                 &transform_offset, &transform_buf[0]);
+    }
+  }
+
+  // Compress all transformed data in one stream.
+  if (!Woff2Compress(transform_buf.data(), total_transform_length,
+                     &compression_buf[0],
+                     &total_compressed_length,
+                     params.brotli_quality)) {
+#ifdef FONT_COMPRESSION_BIN
+    fprintf(stderr, "Compression of combined table failed.\n");
+#endif
+    return FONT_COMPRESSION_FAILURE();
+  }
+
+#ifdef FONT_COMPRESSION_BIN
+  fprintf(stderr, "Compressed %zu to %u.\n", total_transform_length,
+          total_compressed_length);
+#endif
+
+  // Compress the extended metadata
+  // TODO(user): how does this apply to collections
+  uint32_t compressed_metadata_buf_length =
+    CompressedBufferSize(params.extended_metadata.length());
+  std::vector<uint8_t> compressed_metadata_buf(compressed_metadata_buf_length);
+
+  if (params.extended_metadata.length() > 0) {
+    if (!TextCompress((const uint8_t*)params.extended_metadata.data(),
+                      params.extended_metadata.length(),
+                      compressed_metadata_buf.data(),
+                      &compressed_metadata_buf_length,
+                      params.brotli_quality)) {
+#ifdef FONT_COMPRESSION_BIN
+      fprintf(stderr, "Compression of extended metadata failed.\n");
+#endif
+      return FONT_COMPRESSION_FAILURE();
+    }
+  } else {
+    compressed_metadata_buf_length = 0;
+  }
+
+  std::vector<Table> tables;
+  std::map<std::pair<uint32_t, uint32_t>, uint16_t> index_by_tag_offset;
+
+  for (const auto& font : font_collection.fonts) {
+
+    for (const auto tag : font.OutputOrderedTags()) {
+      const Font::Table& src_table = font.tables.at(tag);
+      if (src_table.IsReused()) {
+        continue;
+      }
+
+      std::pair<uint32_t, uint32_t> tag_offset(src_table.tag, src_table.offset);
+      if (index_by_tag_offset.find(tag_offset) == index_by_tag_offset.end()) {
+        index_by_tag_offset[tag_offset] = tables.size();
+      } else {
+        return false;
+      }
+
+      Table table;
+      table.tag = src_table.tag;
+      table.flags = src_table.flag_byte;
+      table.src_length = src_table.length;
+      table.transform_length = src_table.length;
+      const uint8_t* transformed_data = src_table.data;
+      const Font::Table* transformed_table =
+          font.FindTable(src_table.tag ^ 0x80808080);
+      if (transformed_table != NULL) {
+        table.flags = transformed_table->flag_byte;
+        table.flags |= kWoff2FlagsTransform;
+        table.transform_length = transformed_table->length;
+        transformed_data = transformed_table->data;
+
+      }
+      tables.push_back(table);
+    }
+  }
+
+  size_t woff2_length = ComputeWoff2Length(font_collection, tables,
+      index_by_tag_offset, total_compressed_length,
+      compressed_metadata_buf_length);
+  if (woff2_length > *result_length) {
+#ifdef FONT_COMPRESSION_BIN
+    fprintf(stderr, "Result allocation was too small (%zd vs %zd bytes).\n",
+           *result_length, woff2_length);
+#endif
+    return FONT_COMPRESSION_FAILURE();
+  }
+  *result_length = woff2_length;
+
+  size_t offset = 0;
+
+  // start of woff2 header (http://www.w3.org/TR/WOFF2/#woff20Header)
+  StoreU32(kWoff2Signature, &offset, result);
+  if (font_collection.flavor != kTtcFontFlavor) {
+    StoreU32(font_collection.fonts[0].flavor, &offset, result);
+  } else {
+    StoreU32(kTtcFontFlavor, &offset, result);
+  }
+  StoreU32(woff2_length, &offset, result);
+  Store16(tables.size(), &offset, result);
+  Store16(0, &offset, result);  // reserved
+  // totalSfntSize
+  StoreU32(ComputeUncompressedLength(font_collection), &offset, result);
+  StoreU32(total_compressed_length, &offset, result);  // totalCompressedSize
+
+  // Let's just all be v1.0
+  Store16(1, &offset, result);  // majorVersion
+  Store16(0, &offset, result);  // minorVersion
+  if (compressed_metadata_buf_length > 0) {
+    StoreU32(woff2_length - compressed_metadata_buf_length,
+             &offset, result);  // metaOffset
+    StoreU32(compressed_metadata_buf_length, &offset, result);  // metaLength
+    StoreU32(params.extended_metadata.length(),
+             &offset, result);  // metaOrigLength
+  } else {
+    StoreU32(0, &offset, result);  // metaOffset
+    StoreU32(0, &offset, result);  // metaLength
+    StoreU32(0, &offset, result);  // metaOrigLength
+  }
+  StoreU32(0, &offset, result);  // privOffset
+  StoreU32(0, &offset, result);  // privLength
+  // end of woff2 header
+
+  // table directory (http://www.w3.org/TR/WOFF2/#table_dir_format)
+  for (const auto& table : tables) {
+    StoreTableEntry(table, &offset, result);
+  }
+
+  // for collections only, collection table directory
+  if (font_collection.flavor == kTtcFontFlavor) {
+    StoreU32(font_collection.header_version, &offset, result);
+    Store255UShort(font_collection.fonts.size(), &offset, result);
+    for (const Font& font : font_collection.fonts) {
+
+      uint16_t num_tables = 0;
+      for (const auto& entry : font.tables) {
+        const Font::Table& table = entry.second;
+        if (table.tag & 0x80808080) continue;  // don't write xform tables
+        num_tables++;
+      }
+      Store255UShort(num_tables, &offset, result);
+
+      StoreU32(font.flavor, &offset, result);
+      for (const auto& entry : font.tables) {
+        const Font::Table& table = entry.second;
+        if (table.tag & 0x80808080) continue;  // don't write xform tables
+
+        // for reused tables, only the original has an updated offset
+        uint32_t table_offset =
+          table.IsReused() ? table.reuse_of->offset : table.offset;
+        uint32_t table_length =
+          table.IsReused() ? table.reuse_of->length : table.length;
+        std::pair<uint32_t, uint32_t> tag_offset(table.tag, table_offset);
+        if (index_by_tag_offset.find(tag_offset) == index_by_tag_offset.end()) {
+#ifdef FONT_COMPRESSION_BIN
+fprintf(stderr, "Missing table index for offset 0x%08x\n",
+                  table_offset);
+#endif
+          return FONT_COMPRESSION_FAILURE();
+        }
+        uint16_t index = index_by_tag_offset[tag_offset];
+        Store255UShort(index, &offset, result);
+
+      }
+
+    }
+  }
+
+  // compressed data format (http://www.w3.org/TR/WOFF2/#table_format)
+
+  StoreBytes(&compression_buf[0], total_compressed_length, &offset, result);
+  offset = Round4(offset);
+
+  StoreBytes(compressed_metadata_buf.data(), compressed_metadata_buf_length,
+             &offset, result);
+
+  if (*result_length != offset) {
+#ifdef FONT_COMPRESSION_BIN
+    fprintf(stderr, "Mismatch between computed and actual length "
+            "(%zd vs %zd)\n", *result_length, offset);
+#endif
+    return FONT_COMPRESSION_FAILURE();
+  }
+  return true;
+}
+
+} // namespace woff2
diff --git a/modules/woff2/src/woff2_info.cc b/modules/woff2/src/woff2_info.cc
new file mode 100644
index 0000000000..b132304537
--- /dev/null
+++ b/modules/woff2/src/woff2_info.cc
@@ -0,0 +1,142 @@
+/* Copyright 2014 Google Inc. All Rights Reserved.
+
+   Distributed under MIT license.
+   See file LICENSE for detail or copy at https://opensource.org/licenses/MIT
+*/
+
+/* A commandline tool for dumping info about a woff2 file. */
+
+#include <string>
+
+#include "file.h"
+#include "./woff2_common.h"
+#include "./buffer.h"
+#include "./font.h"
+#include "./table_tags.h"
+#include "./variable_length.h"
+
+std::string PrintTag(int tag) {
+  if (tag & 0x80808080) {
+    return std::string("_xfm");  // print _xfm for xform tables (else garbage)
+  }
+  char printable[] = {
+    static_cast<char>((tag >> 24) & 0xFF),
+    static_cast<char>((tag >> 16) & 0xFF),
+    static_cast<char>((tag >> 8) & 0xFF),
+    static_cast<char>(tag & 0xFF)
+  };
+  return std::string(printable, 4);
+}
+
+int main(int argc, char **argv) {
+  if (argc != 2) {
+    fprintf(stderr, "One argument, the input filename, must be provided.\n");
+    return 1;
+  }
+
+  std::string filename(argv[1]);
+  std::string outfilename = filename.substr(0, filename.find_last_of(".")) + ".woff2";
+  fprintf(stdout, "Processing %s => %s\n",
+    filename.c_str(), outfilename.c_str());
+  std::string input = woff2::GetFileContent(filename);
+
+  woff2::Buffer file(reinterpret_cast<const uint8_t*>(input.data()),
+    input.size());
+
+  printf("WOFF2Header\n");
+  uint32_t signature, flavor, length, totalSfntSize, totalCompressedSize;
+  uint32_t metaOffset, metaLength, metaOrigLength, privOffset, privLength;
+  uint16_t num_tables, reserved, major, minor;
+  if (!file.ReadU32(&signature)) return 1;
+  if (!file.ReadU32(&flavor)) return 1;
+  if (!file.ReadU32(&length)) return 1;
+  if (!file.ReadU16(&num_tables)) return 1;
+  if (!file.ReadU16(&reserved)) return 1;
+  if (!file.ReadU32(&totalSfntSize)) return 1;
+  if (!file.ReadU32(&totalCompressedSize)) return 1;
+  if (!file.ReadU16(&major)) return 1;
+  if (!file.ReadU16(&minor)) return 1;
+  if (!file.ReadU32(&metaOffset)) return 1;
+  if (!file.ReadU32(&metaLength)) return 1;
+  if (!file.ReadU32(&metaOrigLength)) return 1;
+  if (!file.ReadU32(&privOffset)) return 1;
+  if (!file.ReadU32(&privLength)) return 1;
+
+  if (signature != 0x774F4632) {
+    printf("Invalid signature: %08x\n", signature);
+    return 1;
+  }
+  printf("signature           0x%08x\n", signature);
+  printf("flavor              0x%08x\n", flavor);
+  printf("length              %d\n", length);
+  printf("numTables           %d\n", num_tables);
+  printf("reserved            %d\n", reserved);
+  printf("totalSfntSize       %d\n", totalSfntSize);
+  printf("totalCompressedSize %d\n", totalCompressedSize);
+  printf("majorVersion        %d\n", major);
+  printf("minorVersion        %d\n", minor);
+  printf("metaOffset          %d\n", metaOffset);
+  printf("metaLength          %d\n", metaLength);
+  printf("metaOrigLength      %d\n", metaOrigLength);
+  printf("privOffset          %d\n", privOffset);
+  printf("privLength          %d\n", privLength);
+
+  std::vector<uint32_t> table_tags;
+  printf("TableDirectory starts at +%zu\n", file.offset());
+  printf("Entry offset flags tag  origLength txLength\n");
+  for (auto i = 0; i < num_tables; i++) {
+    size_t offset = file.offset();
+    uint8_t flags;
+    uint32_t tag, origLength, transformLength;
+    if (!file.ReadU8(&flags)) return 1;
+    if ((flags & 0x3f) == 0x3f) {
+      if (!file.ReadU32(&tag)) return 1;
+    } else {
+      tag = woff2::kKnownTags[flags & 0x3f];
+    }
+    table_tags.push_back(tag);
+    if (!ReadBase128(&file, &origLength)) return 1;
+
+    printf("%5d %6zu  0x%02x %s %10d", i, offset, flags,
+        PrintTag(tag).c_str(), origLength);
+
+    uint8_t xform_version = (flags >> 6) & 0x3;
+    if (tag == woff2::kGlyfTableTag || tag == woff2::kLocaTableTag) {
+      if (xform_version == 0) {
+        if (!ReadBase128(&file, &transformLength)) return 1;
+        printf(" %8d", transformLength);
+      }
+    } else if (xform_version > 0) {
+      if (!ReadBase128(&file, &transformLength)) return 1;
+      printf(" %8d", transformLength);
+    }
+    printf("\n");
+  }
+
+  // Collection header
+  if (flavor == woff2::kTtcFontFlavor) {
+    uint32_t version, numFonts;
+    if (!file.ReadU32(&version)) return 1;
+    if (!woff2::Read255UShort(&file, &numFonts)) return 1;
+    printf("CollectionHeader 0x%08x %d fonts\n", version, numFonts);
+
+    for (auto i = 0; i < numFonts; i++) {
+      uint32_t numTables, flavor;
+      if (!woff2::Read255UShort(&file, &numTables)) return 1;
+      if (!file.ReadU32(&flavor)) return 1;
+      printf("CollectionFontEntry %d flavor 0x%08x %d tables\n", i, flavor,
+          numTables);
+      for (auto j = 0; j < numTables; j++) {
+        uint32_t table_idx;
+        if (!woff2::Read255UShort(&file, &table_idx)) return 1;
+        if (table_idx >= table_tags.size()) return 1;
+        printf("  %d %s (idx %d)\n", j,
+            PrintTag(table_tags[table_idx]).c_str(), table_idx);
+      }
+    }
+  }
+
+  printf("TableDirectory ends at +%zu\n", file.offset());
+
+  return 0;
+}
diff --git a/modules/woff2/src/woff2_out.cc b/modules/woff2/src/woff2_out.cc
new file mode 100644
index 0000000000..a22d3bf8be
--- /dev/null
+++ b/modules/woff2/src/woff2_out.cc
@@ -0,0 +1,63 @@
+/* Copyright 2014 Google Inc. All Rights Reserved.
+
+   Distributed under MIT license.
+   See file LICENSE for detail or copy at https://opensource.org/licenses/MIT
+*/
+
+/* Output buffer for WOFF2 decompression. */
+
+#include <woff2/output.h>
+
+namespace woff2 {
+
+WOFF2StringOut::WOFF2StringOut(std::string *buf)
+    : buf_(buf), max_size_(kDefaultMaxSize), offset_(0) {}
+
+bool WOFF2StringOut::Write(const void *buf, size_t n) {
+  return Write(buf, offset_, n);
+}
+
+bool WOFF2StringOut::Write(const void *buf, size_t offset, size_t n) {
+  if (offset > max_size_ || n > max_size_ - offset) {
+    return false;
+  }
+  if (offset == buf_->size()) {
+    buf_->append(static_cast<const char*>(buf), n);
+  } else {
+    if (offset + n > buf_->size()) {
+      buf_->append(offset + n - buf_->size(), 0);
+    }
+    buf_->replace(offset, n, static_cast<const char*>(buf), n);
+  }
+  offset_ = std::max(offset_, offset + n);
+
+  return true;
+}
+
+void WOFF2StringOut::SetMaxSize(size_t max_size) {
+  max_size_ = max_size;
+  if (offset_ > max_size_) {
+    offset_ = max_size_;
+  }
+}
+
+WOFF2MemoryOut::WOFF2MemoryOut(uint8_t* buf, size_t buf_size)
+  : buf_(buf),
+    buf_size_(buf_size),
+    offset_(0) {}
+
+bool WOFF2MemoryOut::Write(const void *buf, size_t n) {
+  return Write(buf, offset_, n);
+}
+
+bool WOFF2MemoryOut::Write(const void *buf, size_t offset, size_t n) {
+  if (offset > buf_size_ || n > buf_size_ - offset) {
+    return false;
+  }
+  std::memcpy(buf_ + offset, buf, n);
+  offset_ = std::max(offset_, offset + n);
+
+  return true;
+}
+
+} // namespace woff2