tools/aapt2/StringPool.cpp - platform/frameworks/base - Gitiles

 /*
  * Copyright (C) 2015 The Android Open Source Project
  *
  * 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.
  */

 #include "StringPool.h"

 #include <algorithm>
 #include <memory>
 #include <string>

 #include "android-base/logging.h"
 #include "androidfw/ResourceTypes.h"

 #include "util/BigBuffer.h"
 #include "util/StringPiece.h"
 #include "util/Util.h"

 namespace aapt {

 StringPool::Ref::Ref() : entry_(nullptr) {}

 StringPool::Ref::Ref(const StringPool::Ref& rhs) : entry_(rhs.entry_) {
   if (entry_ != nullptr) {
     entry_->ref_++;
   }
 }

 StringPool::Ref::Ref(StringPool::Entry* entry) : entry_(entry) {
   if (entry_ != nullptr) {
     entry_->ref_++;
   }
 }

 StringPool::Ref::~Ref() {
   if (entry_ != nullptr) {
     entry_->ref_--;
   }
 }

 StringPool::Ref& StringPool::Ref::operator=(const StringPool::Ref& rhs) {
   if (rhs.entry_ != nullptr) {
     rhs.entry_->ref_++;
   }

   if (entry_ != nullptr) {
     entry_->ref_--;
   }
   entry_ = rhs.entry_;
   return *this;
 }

 const std::string* StringPool::Ref::operator->() const {
   return &entry_->value;
 }

 const std::string& StringPool::Ref::operator*() const { return entry_->value; }

 size_t StringPool::Ref::index() const { return entry_->index; }

 const StringPool::Context& StringPool::Ref::GetContext() const {
   return entry_->context;
 }

 StringPool::StyleRef::StyleRef() : entry_(nullptr) {}

 StringPool::StyleRef::StyleRef(const StringPool::StyleRef& rhs)
     : entry_(rhs.entry_) {
   if (entry_ != nullptr) {
     entry_->ref_++;
   }
 }

 StringPool::StyleRef::StyleRef(StringPool::StyleEntry* entry) : entry_(entry) {
   if (entry_ != nullptr) {
     entry_->ref_++;
   }
 }

 StringPool::StyleRef::~StyleRef() {
   if (entry_ != nullptr) {
     entry_->ref_--;
   }
 }

 StringPool::StyleRef& StringPool::StyleRef::operator=(
     const StringPool::StyleRef& rhs) {
   if (rhs.entry_ != nullptr) {
     rhs.entry_->ref_++;
   }

   if (entry_ != nullptr) {
     entry_->ref_--;
   }
   entry_ = rhs.entry_;
   return *this;
 }

 const StringPool::StyleEntry* StringPool::StyleRef::operator->() const {
   return entry_;
 }

 const StringPool::StyleEntry& StringPool::StyleRef::operator*() const {
   return *entry_;
 }

 size_t StringPool::StyleRef::index() const { return entry_->str.index(); }

 const StringPool::Context& StringPool::StyleRef::GetContext() const {
   return entry_->str.GetContext();
 }

 StringPool::Ref StringPool::MakeRef(const StringPiece& str) {
   return MakeRefImpl(str, Context{}, true);
 }

 StringPool::Ref StringPool::MakeRef(const StringPiece& str,
                                     const Context& context) {
   return MakeRefImpl(str, context, true);
 }

 StringPool::Ref StringPool::MakeRefImpl(const StringPiece& str,
                                         const Context& context, bool unique) {
   if (unique) {
     auto iter = indexed_strings_.find(str);
     if (iter != std::end(indexed_strings_)) {
       return Ref(iter->second);
     }
   }

   Entry* entry = new Entry();
   entry->value = str.ToString();
   entry->context = context;
   entry->index = strings_.size();
   entry->ref_ = 0;
   strings_.emplace_back(entry);
   indexed_strings_.insert(std::make_pair(StringPiece(entry->value), entry));
   return Ref(entry);
 }

 StringPool::StyleRef StringPool::MakeRef(const StyleString& str) {
   return MakeRef(str, Context{});
 }

 StringPool::StyleRef StringPool::MakeRef(const StyleString& str,
                                          const Context& context) {
   Entry* entry = new Entry();
   entry->value = str.str;
   entry->context = context;
   entry->index = strings_.size();
   entry->ref_ = 0;
   strings_.emplace_back(entry);
   indexed_strings_.insert(std::make_pair(StringPiece(entry->value), entry));

   StyleEntry* style_entry = new StyleEntry();
   style_entry->str = Ref(entry);
   for (const aapt::Span& span : str.spans) {
     style_entry->spans.emplace_back(
         Span{MakeRef(span.name), span.first_char, span.last_char});
   }
   style_entry->ref_ = 0;
   styles_.emplace_back(style_entry);
   return StyleRef(style_entry);
 }

 StringPool::StyleRef StringPool::MakeRef(const StyleRef& ref) {
   Entry* entry = new Entry();
   entry->value = *ref.entry_->str;
   entry->context = ref.entry_->str.entry_->context;
   entry->index = strings_.size();
   entry->ref_ = 0;
   strings_.emplace_back(entry);
   indexed_strings_.insert(std::make_pair(StringPiece(entry->value), entry));

   StyleEntry* style_entry = new StyleEntry();
   style_entry->str = Ref(entry);
   for (const Span& span : ref.entry_->spans) {
     style_entry->spans.emplace_back(
         Span{MakeRef(*span.name), span.first_char, span.last_char});
   }
   style_entry->ref_ = 0;
   styles_.emplace_back(style_entry);
   return StyleRef(style_entry);
 }

 void StringPool::Merge(StringPool&& pool) {
   indexed_strings_.insert(pool.indexed_strings_.begin(),
                           pool.indexed_strings_.end());
   pool.indexed_strings_.clear();
   std::move(pool.strings_.begin(), pool.strings_.end(),
             std::back_inserter(strings_));
   pool.strings_.clear();
   std::move(pool.styles_.begin(), pool.styles_.end(),
             std::back_inserter(styles_));
   pool.styles_.clear();

   // Assign the indices.
   const size_t len = strings_.size();
   for (size_t index = 0; index < len; index++) {
     strings_[index]->index = index;
   }
 }

 void StringPool::HintWillAdd(size_t stringCount, size_t styleCount) {
   strings_.reserve(strings_.size() + stringCount);
   styles_.reserve(styles_.size() + styleCount);
 }

 void StringPool::Prune() {
   const auto iter_end = indexed_strings_.end();
   auto index_iter = indexed_strings_.begin();
   while (index_iter != iter_end) {
     if (index_iter->second->ref_ <= 0) {
       index_iter = indexed_strings_.erase(index_iter);
     } else {
       ++index_iter;
     }
   }

   auto end_iter2 =
       std::remove_if(strings_.begin(), strings_.end(),
                      [](const std::unique_ptr<Entry>& entry) -> bool {
                        return entry->ref_ <= 0;
                      });

   auto end_iter3 =
       std::remove_if(styles_.begin(), styles_.end(),
                      [](const std::unique_ptr<StyleEntry>& entry) -> bool {
                        return entry->ref_ <= 0;
                      });

   // Remove the entries at the end or else we'll be accessing
   // a deleted string from the StyleEntry.
   strings_.erase(end_iter2, strings_.end());
   styles_.erase(end_iter3, styles_.end());

   // Reassign the indices.
   const size_t len = strings_.size();
   for (size_t index = 0; index < len; index++) {
     strings_[index]->index = index;
   }
 }

 void StringPool::Sort(
     const std::function<bool(const Entry&, const Entry&)>& cmp) {
   std::sort(
       strings_.begin(), strings_.end(),
       [&cmp](const std::unique_ptr<Entry>& a,
              const std::unique_ptr<Entry>& b) -> bool { return cmp(*a, *b); });

   // Assign the indices.
   const size_t len = strings_.size();
   for (size_t index = 0; index < len; index++) {
     strings_[index]->index = index;
   }

   // Reorder the styles.
   std::sort(styles_.begin(), styles_.end(),
             [](const std::unique_ptr<StyleEntry>& lhs,
                const std::unique_ptr<StyleEntry>& rhs) -> bool {
               return lhs->str.index() < rhs->str.index();
             });
 }

 template <typename T>
 static T* EncodeLength(T* data, size_t length) {
   static_assert(std::is_integral<T>::value, "wat.");

   constexpr size_t kMask = 1 << ((sizeof(T) * 8) - 1);
   constexpr size_t kMaxSize = kMask - 1;
   if (length > kMaxSize) {
     *data++ = kMask | (kMaxSize & (length >> (sizeof(T) * 8)));
   }
   *data++ = length;
   return data;
 }

 template <typename T>
 static size_t EncodedLengthUnits(size_t length) {
   static_assert(std::is_integral<T>::value, "wat.");

   constexpr size_t kMask = 1 << ((sizeof(T) * 8) - 1);
   constexpr size_t kMaxSize = kMask - 1;
   return length > kMaxSize ? 2 : 1;
 }

 bool StringPool::Flatten(BigBuffer* out, const StringPool& pool, bool utf8) {
   const size_t start_index = out->size();
   android::ResStringPool_header* header =
       out->NextBlock<android::ResStringPool_header>();
   header->header.type = android::RES_STRING_POOL_TYPE;
   header->header.headerSize = sizeof(*header);
   header->stringCount = pool.size();
   if (utf8) {
     header->flags |= android::ResStringPool_header::UTF8_FLAG;
   }

   uint32_t* indices =
       pool.size() != 0 ? out->NextBlock<uint32_t>(pool.size()) : nullptr;

   uint32_t* style_indices = nullptr;
   if (!pool.styles_.empty()) {
     header->styleCount = pool.styles_.back()->str.index() + 1;
     style_indices = out->NextBlock<uint32_t>(header->styleCount);
   }

   const size_t before_strings_index = out->size();
   header->stringsStart = before_strings_index - start_index;

   for (const auto& entry : pool) {
     *indices = out->size() - before_strings_index;
     indices++;

     if (utf8) {
       const std::string& encoded = entry->value;
       const ssize_t utf16_length = utf8_to_utf16_length(
           reinterpret_cast<const uint8_t*>(entry->value.data()),
           entry->value.size());
       CHECK(utf16_length >= 0);

       const size_t total_size = EncodedLengthUnits<char>(utf16_length) +
                                 EncodedLengthUnits<char>(encoded.length()) +
                                 encoded.size() + 1;

       char* data = out->NextBlock<char>(total_size);

       // First encode the UTF16 string length.
       data = EncodeLength(data, utf16_length);

       // Now encode the size of the real UTF8 string.
       data = EncodeLength(data, encoded.length());
       strncpy(data, encoded.data(), encoded.size());

     } else {
       const std::u16string encoded = util::Utf8ToUtf16(entry->value);
       const ssize_t utf16_length = encoded.size();

       // Total number of 16-bit words to write.
       const size_t total_size =
           EncodedLengthUnits<char16_t>(utf16_length) + encoded.size() + 1;

       char16_t* data = out->NextBlock<char16_t>(total_size);

       // Encode the actual UTF16 string length.
       data = EncodeLength(data, utf16_length);
       const size_t byte_length = encoded.size() * sizeof(char16_t);

       // NOTE: For some reason, strncpy16(data, entry->value.data(),
       // entry->value.size()) truncates the string.
       memcpy(data, encoded.data(), byte_length);

       // The null-terminating character is already here due to the block of data
       // being set to 0s on allocation.
     }
   }

   out->Align4();

   if (!pool.styles_.empty()) {
     const size_t before_styles_index = out->size();
     header->stylesStart = before_styles_index - start_index;

     size_t current_index = 0;
     for (const auto& entry : pool.styles_) {
       while (entry->str.index() > current_index) {
         style_indices[current_index++] = out->size() - before_styles_index;

         uint32_t* span_offset = out->NextBlock<uint32_t>();
         *span_offset = android::ResStringPool_span::END;
       }
       style_indices[current_index++] = out->size() - before_styles_index;

       android::ResStringPool_span* span =
           out->NextBlock<android::ResStringPool_span>(entry->spans.size());
       for (const auto& s : entry->spans) {
         span->name.index = s.name.index();
         span->firstChar = s.first_char;
         span->lastChar = s.last_char;
         span++;
       }

       uint32_t* spanEnd = out->NextBlock<uint32_t>();
       *spanEnd = android::ResStringPool_span::END;
     }

     // The error checking code in the platform looks for an entire
     // ResStringPool_span structure worth of 0xFFFFFFFF at the end
     // of the style block, so fill in the remaining 2 32bit words
     // with 0xFFFFFFFF.
     const size_t padding_length = sizeof(android::ResStringPool_span) -
                                   sizeof(android::ResStringPool_span::name);
     uint8_t* padding = out->NextBlock<uint8_t>(padding_length);
     memset(padding, 0xff, padding_length);
     out->Align4();
   }
   header->header.size = out->size() - start_index;
   return true;
 }

 bool StringPool::FlattenUtf8(BigBuffer* out, const StringPool& pool) {
   return Flatten(out, pool, true);
 }

 bool StringPool::FlattenUtf16(BigBuffer* out, const StringPool& pool) {
   return Flatten(out, pool, false);
 }

 }  // namespace aapt
	/*
	* Copyright (C) 2015 The Android Open Source Project
	*
	* 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.
	*/

	#include "StringPool.h"

	#include <algorithm>
	#include <memory>
	#include <string>

	#include "android-base/logging.h"
	#include "androidfw/ResourceTypes.h"

	#include "util/BigBuffer.h"
	#include "util/StringPiece.h"
	#include "util/Util.h"

	namespace aapt {

	StringPool::Ref::Ref() : entry_(nullptr) {}

	StringPool::Ref::Ref(const StringPool::Ref& rhs) : entry_(rhs.entry_) {
	if (entry_ != nullptr) {
	entry_->ref_++;
	}
	}

	StringPool::Ref::Ref(StringPool::Entry* entry) : entry_(entry) {
	if (entry_ != nullptr) {
	entry_->ref_++;
	}
	}

	StringPool::Ref::~Ref() {
	if (entry_ != nullptr) {
	entry_->ref_--;
	}
	}

	StringPool::Ref& StringPool::Ref::operator=(const StringPool::Ref& rhs) {
	if (rhs.entry_ != nullptr) {
	rhs.entry_->ref_++;
	}

	if (entry_ != nullptr) {
	entry_->ref_--;
	}
	entry_ = rhs.entry_;
	return *this;
	}

	const std::string* StringPool::Ref::operator->() const {
	return &entry_->value;
	}

	const std::string& StringPool::Ref::operator*() const { return entry_->value; }

	size_t StringPool::Ref::index() const { return entry_->index; }

	const StringPool::Context& StringPool::Ref::GetContext() const {
	return entry_->context;
	}

	StringPool::StyleRef::StyleRef() : entry_(nullptr) {}

	StringPool::StyleRef::StyleRef(const StringPool::StyleRef& rhs)
	: entry_(rhs.entry_) {
	if (entry_ != nullptr) {
	entry_->ref_++;
	}
	}

	StringPool::StyleRef::StyleRef(StringPool::StyleEntry* entry) : entry_(entry) {
	if (entry_ != nullptr) {
	entry_->ref_++;
	}
	}

	StringPool::StyleRef::~StyleRef() {
	if (entry_ != nullptr) {
	entry_->ref_--;
	}
	}

	StringPool::StyleRef& StringPool::StyleRef::operator=(
	const StringPool::StyleRef& rhs) {
	if (rhs.entry_ != nullptr) {
	rhs.entry_->ref_++;
	}

	if (entry_ != nullptr) {
	entry_->ref_--;
	}
	entry_ = rhs.entry_;
	return *this;
	}

	const StringPool::StyleEntry* StringPool::StyleRef::operator->() const {
	return entry_;
	}

	const StringPool::StyleEntry& StringPool::StyleRef::operator*() const {
	return *entry_;
	}

	size_t StringPool::StyleRef::index() const { return entry_->str.index(); }

	const StringPool::Context& StringPool::StyleRef::GetContext() const {
	return entry_->str.GetContext();
	}

	StringPool::Ref StringPool::MakeRef(const StringPiece& str) {
	return MakeRefImpl(str, Context{}, true);
	}

	StringPool::Ref StringPool::MakeRef(const StringPiece& str,
	const Context& context) {
	return MakeRefImpl(str, context, true);
	}

	StringPool::Ref StringPool::MakeRefImpl(const StringPiece& str,
	const Context& context, bool unique) {
	if (unique) {
	auto iter = indexed_strings_.find(str);
	if (iter != std::end(indexed_strings_)) {
	return Ref(iter->second);
	}
	}

	Entry* entry = new Entry();
	entry->value = str.ToString();
	entry->context = context;
	entry->index = strings_.size();
	entry->ref_ = 0;
	strings_.emplace_back(entry);
	indexed_strings_.insert(std::make_pair(StringPiece(entry->value), entry));
	return Ref(entry);
	}

	StringPool::StyleRef StringPool::MakeRef(const StyleString& str) {
	return MakeRef(str, Context{});
	}

	StringPool::StyleRef StringPool::MakeRef(const StyleString& str,
	const Context& context) {
	Entry* entry = new Entry();
	entry->value = str.str;
	entry->context = context;
	entry->index = strings_.size();
	entry->ref_ = 0;
	strings_.emplace_back(entry);
	indexed_strings_.insert(std::make_pair(StringPiece(entry->value), entry));

	StyleEntry* style_entry = new StyleEntry();
	style_entry->str = Ref(entry);
	for (const aapt::Span& span : str.spans) {
	style_entry->spans.emplace_back(
	Span{MakeRef(span.name), span.first_char, span.last_char});
	}
	style_entry->ref_ = 0;
	styles_.emplace_back(style_entry);
	return StyleRef(style_entry);
	}

	StringPool::StyleRef StringPool::MakeRef(const StyleRef& ref) {
	Entry* entry = new Entry();
	entry->value = *ref.entry_->str;
	entry->context = ref.entry_->str.entry_->context;
	entry->index = strings_.size();
	entry->ref_ = 0;
	strings_.emplace_back(entry);
	indexed_strings_.insert(std::make_pair(StringPiece(entry->value), entry));

	StyleEntry* style_entry = new StyleEntry();
	style_entry->str = Ref(entry);
	for (const Span& span : ref.entry_->spans) {
	style_entry->spans.emplace_back(
	Span{MakeRef(*span.name), span.first_char, span.last_char});
	}
	style_entry->ref_ = 0;
	styles_.emplace_back(style_entry);
	return StyleRef(style_entry);
	}

	void StringPool::Merge(StringPool&& pool) {
	indexed_strings_.insert(pool.indexed_strings_.begin(),
	pool.indexed_strings_.end());
	pool.indexed_strings_.clear();
	std::move(pool.strings_.begin(), pool.strings_.end(),
	std::back_inserter(strings_));
	pool.strings_.clear();
	std::move(pool.styles_.begin(), pool.styles_.end(),
	std::back_inserter(styles_));
	pool.styles_.clear();

	// Assign the indices.
	const size_t len = strings_.size();
	for (size_t index = 0; index < len; index++) {
	strings_[index]->index = index;
	}
	}

	void StringPool::HintWillAdd(size_t stringCount, size_t styleCount) {
	strings_.reserve(strings_.size() + stringCount);
	styles_.reserve(styles_.size() + styleCount);
	}

	void StringPool::Prune() {
	const auto iter_end = indexed_strings_.end();
	auto index_iter = indexed_strings_.begin();
	while (index_iter != iter_end) {
	if (index_iter->second->ref_ <= 0) {
	index_iter = indexed_strings_.erase(index_iter);
	} else {
	++index_iter;
	}
	}

	auto end_iter2 =
	std::remove_if(strings_.begin(), strings_.end(),
	[](const std::unique_ptr<Entry>& entry) -> bool {
	return entry->ref_ <= 0;
	});

	auto end_iter3 =
	std::remove_if(styles_.begin(), styles_.end(),
	[](const std::unique_ptr<StyleEntry>& entry) -> bool {
	return entry->ref_ <= 0;
	});

	// Remove the entries at the end or else we'll be accessing
	// a deleted string from the StyleEntry.
	strings_.erase(end_iter2, strings_.end());
	styles_.erase(end_iter3, styles_.end());

	// Reassign the indices.
	const size_t len = strings_.size();
	for (size_t index = 0; index < len; index++) {
	strings_[index]->index = index;
	}
	}

	void StringPool::Sort(
	const std::function<bool(const Entry&, const Entry&)>& cmp) {
	std::sort(
	strings_.begin(), strings_.end(),
	[&cmp](const std::unique_ptr<Entry>& a,
	const std::unique_ptr<Entry>& b) -> bool { return cmp(a, b); });

	// Assign the indices.
	const size_t len = strings_.size();
	for (size_t index = 0; index < len; index++) {
	strings_[index]->index = index;
	}

	// Reorder the styles.
	std::sort(styles_.begin(), styles_.end(),
	[](const std::unique_ptr<StyleEntry>& lhs,
	const std::unique_ptr<StyleEntry>& rhs) -> bool {
	return lhs->str.index() < rhs->str.index();
	});
	}

	template <typename T>
	static T* EncodeLength(T* data, size_t length) {
	static_assert(std::is_integral<T>::value, "wat.");

	constexpr size_t kMask = 1 << ((sizeof(T) * 8) - 1);
	constexpr size_t kMaxSize = kMask - 1;
	if (length > kMaxSize) {
	data++ = kMask \| (kMaxSize & (length >> (sizeof(T) 8)));
	}
	*data++ = length;
	return data;
	}

	template <typename T>
	static size_t EncodedLengthUnits(size_t length) {
	static_assert(std::is_integral<T>::value, "wat.");

	constexpr size_t kMask = 1 << ((sizeof(T) * 8) - 1);
	constexpr size_t kMaxSize = kMask - 1;
	return length > kMaxSize ? 2 : 1;
	}

	bool StringPool::Flatten(BigBuffer* out, const StringPool& pool, bool utf8) {
	const size_t start_index = out->size();
	android::ResStringPool_header* header =
	out->NextBlock<android::ResStringPool_header>();
	header->header.type = android::RES_STRING_POOL_TYPE;
	header->header.headerSize = sizeof(*header);
	header->stringCount = pool.size();
	if (utf8) {
	header->flags \|= android::ResStringPool_header::UTF8_FLAG;
	}

	uint32_t* indices =
	pool.size() != 0 ? out->NextBlock<uint32_t>(pool.size()) : nullptr;

	uint32_t* style_indices = nullptr;
	if (!pool.styles_.empty()) {
	header->styleCount = pool.styles_.back()->str.index() + 1;
	style_indices = out->NextBlock<uint32_t>(header->styleCount);
	}

	const size_t before_strings_index = out->size();
	header->stringsStart = before_strings_index - start_index;

	for (const auto& entry : pool) {
	*indices = out->size() - before_strings_index;
	indices++;

	if (utf8) {
	const std::string& encoded = entry->value;
	const ssize_t utf16_length = utf8_to_utf16_length(
	reinterpret_cast<const uint8_t*>(entry->value.data()),
	entry->value.size());
	CHECK(utf16_length >= 0);

	const size_t total_size = EncodedLengthUnits<char>(utf16_length) +
	EncodedLengthUnits<char>(encoded.length()) +
	encoded.size() + 1;

	char* data = out->NextBlock<char>(total_size);

	// First encode the UTF16 string length.
	data = EncodeLength(data, utf16_length);

	// Now encode the size of the real UTF8 string.
	data = EncodeLength(data, encoded.length());
	strncpy(data, encoded.data(), encoded.size());

	} else {
	const std::u16string encoded = util::Utf8ToUtf16(entry->value);
	const ssize_t utf16_length = encoded.size();

	// Total number of 16-bit words to write.
	const size_t total_size =
	EncodedLengthUnits<char16_t>(utf16_length) + encoded.size() + 1;

	char16_t* data = out->NextBlock<char16_t>(total_size);

	// Encode the actual UTF16 string length.
	data = EncodeLength(data, utf16_length);
	const size_t byte_length = encoded.size() * sizeof(char16_t);

	// NOTE: For some reason, strncpy16(data, entry->value.data(),
	// entry->value.size()) truncates the string.
	memcpy(data, encoded.data(), byte_length);

	// The null-terminating character is already here due to the block of data
	// being set to 0s on allocation.
	}
	}

	out->Align4();

	if (!pool.styles_.empty()) {
	const size_t before_styles_index = out->size();
	header->stylesStart = before_styles_index - start_index;

	size_t current_index = 0;
	for (const auto& entry : pool.styles_) {
	while (entry->str.index() > current_index) {
	style_indices[current_index++] = out->size() - before_styles_index;

	uint32_t* span_offset = out->NextBlock<uint32_t>();
	*span_offset = android::ResStringPool_span::END;
	}
	style_indices[current_index++] = out->size() - before_styles_index;

	android::ResStringPool_span* span =
	out->NextBlock<android::ResStringPool_span>(entry->spans.size());
	for (const auto& s : entry->spans) {
	span->name.index = s.name.index();
	span->firstChar = s.first_char;
	span->lastChar = s.last_char;
	span++;
	}

	uint32_t* spanEnd = out->NextBlock<uint32_t>();
	*spanEnd = android::ResStringPool_span::END;
	}

	// The error checking code in the platform looks for an entire
	// ResStringPool_span structure worth of 0xFFFFFFFF at the end
	// of the style block, so fill in the remaining 2 32bit words
	// with 0xFFFFFFFF.
	const size_t padding_length = sizeof(android::ResStringPool_span) -
	sizeof(android::ResStringPool_span::name);
	uint8_t* padding = out->NextBlock<uint8_t>(padding_length);
	memset(padding, 0xff, padding_length);
	out->Align4();
	}
	header->header.size = out->size() - start_index;
	return true;
	}

	bool StringPool::FlattenUtf8(BigBuffer* out, const StringPool& pool) {
	return Flatten(out, pool, true);
	}

	bool StringPool::FlattenUtf16(BigBuffer* out, const StringPool& pool) {
	return Flatten(out, pool, false);
	}

	} // namespace aapt