Added Brotli compress/decompress utilities and makefiles
diff --git a/woff2/font.cc b/woff2/font.cc
new file mode 100644
index 0000000..2733708
--- /dev/null
+++ b/woff2/font.cc
@@ -0,0 +1,176 @@
+// Copyright 2013 Google Inc. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// Font management utilities
+
+#include "./font.h"
+
+#include <algorithm>
+
+#include "./ots.h"
+#include "./port.h"
+#include "./store_bytes.h"
+
+namespace woff2 {
+
+Font::Table* Font::FindTable(uint32_t tag) {
+ std::map<uint32_t, Font::Table>::iterator it = tables.find(tag);
+ return it == tables.end() ? 0 : &it->second;
+}
+
+const Font::Table* Font::FindTable(uint32_t tag) const {
+ std::map<uint32_t, Font::Table>::const_iterator it = tables.find(tag);
+ return it == tables.end() ? 0 : &it->second;
+}
+
+bool ReadFont(const uint8_t* data, size_t len, Font* font) {
+ ots::Buffer file(data, len);
+
+ // We don't care about the search_range, entry_selector and range_shift
+ // fields, they will always be computed upon writing the font.
+ if (!file.ReadU32(&font->flavor) ||
+ !file.ReadU16(&font->num_tables) ||
+ !file.Skip(6)) {
+ return OTS_FAILURE();
+ }
+
+ std::map<uint32_t, uint32_t> intervals;
+ for (uint16_t i = 0; i < font->num_tables; ++i) {
+ Font::Table table;
+ if (!file.ReadU32(&table.tag) ||
+ !file.ReadU32(&table.checksum) ||
+ !file.ReadU32(&table.offset) ||
+ !file.ReadU32(&table.length)) {
+ return OTS_FAILURE();
+ }
+ if ((table.offset & 3) != 0 ||
+ table.length > len ||
+ len - table.length < table.offset) {
+ return OTS_FAILURE();
+ }
+ intervals[table.offset] = table.length;
+ table.data = data + table.offset;
+ if (font->tables.find(table.tag) != font->tables.end()) {
+ return OTS_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 OTS_FAILURE();
+ }
+ last_offset = i.first + i.second;
+ }
+ return true;
+}
+
+size_t FontFileSize(const Font& font) {
+ size_t max_offset = 12ULL + 16ULL * font.num_tables;
+ for (const auto& i : font.tables) {
+ const Font::Table& table = i.second;
+ size_t padding_size = (4 - (table.length & 3)) & 3;
+ size_t end_offset = (padding_size + table.offset) + table.length;
+ max_offset = std::max(max_offset, end_offset);
+ }
+ return max_offset;
+}
+
+bool WriteFont(const Font& font, uint8_t* dst, size_t dst_size) {
+ if (dst_size < 12ULL + 16ULL * font.num_tables) {
+ return OTS_FAILURE();
+ }
+ size_t offset = 0;
+ StoreU32(font.flavor, &offset, dst);
+ Store16(font.num_tables, &offset, dst);
+ uint16_t max_pow2 = font.num_tables ? Log2Floor(font.num_tables) : 0;
+ uint16_t search_range = max_pow2 ? 1 << (max_pow2 + 4) : 0;
+ uint16_t range_shift = (font.num_tables << 4) - search_range;
+ Store16(search_range, &offset, dst);
+ Store16(max_pow2, &offset, dst);
+ Store16(range_shift, &offset, dst);
+ for (const auto& i : font.tables) {
+ const Font::Table& table = i.second;
+ StoreU32(table.tag, &offset, dst);
+ StoreU32(table.checksum, &offset, dst);
+ StoreU32(table.offset, &offset, dst);
+ StoreU32(table.length, &offset, dst);
+ if (table.offset + table.length < table.offset ||
+ dst_size < table.offset + table.length) {
+ return OTS_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 OTS_FAILURE();
+ }
+ memset(dst + table.offset + table.length, 0, padding_size);
+ }
+ return true;
+}
+
+int NumGlyphs(const Font& font) {
+ const Font::Table* head_table = font.FindTable(kHeadTableTag);
+ const Font::Table* loca_table = font.FindTable(kLocaTableTag);
+ if (head_table == NULL || loca_table == NULL || head_table->length < 52) {
+ return 0;
+ }
+ int index_fmt = head_table->data[51];
+ return (loca_table->length / (index_fmt == 0 ? 2 : 4)) - 1;
+}
+
+bool GetGlyphData(const Font& font, int glyph_index,
+ const uint8_t** glyph_data, size_t* glyph_size) {
+ if (glyph_index < 0) {
+ return OTS_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 OTS_FAILURE();
+ }
+ int index_fmt = head_table->data[51];
+ ots::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 OTS_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 OTS_FAILURE();
+ }
+ *glyph_data = glyf_table->data + offset1;
+ *glyph_size = offset2 - offset1;
+ }
+ return true;
+}
+
+} // namespace woff2