tools/aapt2/unflatten/BinaryResourceParser.cpp - platform/frameworks/base - Git at Google

 /*
  * 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 "ResourceTable.h"
 #include "ResourceUtils.h"
 #include "ResourceValues.h"
 #include "Source.h"
 #include "ValueVisitor.h"
 #include "unflatten/BinaryResourceParser.h"
 #include "unflatten/ResChunkPullParser.h"
 #include "util/Util.h"

 #include <androidfw/ResourceTypes.h>
 #include <androidfw/TypeWrappers.h>
 #include <android-base/macros.h>
 #include <algorithm>
 #include <map>
 #include <string>

 namespace aapt {

 using namespace android;

 namespace {

 /*
  * Visitor that converts a reference's resource ID to a resource name,
  * given a mapping from resource ID to resource name.
  */
 class ReferenceIdToNameVisitor : public ValueVisitor {
 private:
     const std::map<ResourceId, ResourceName>* mMapping;

 public:
     using ValueVisitor::visit;

     ReferenceIdToNameVisitor(const std::map<ResourceId, ResourceName>* mapping) :
             mMapping(mapping) {
         assert(mMapping);
     }

     void visit(Reference* reference) override {
         if (!reference->id || !reference->id.value().isValid()) {
             return;
         }

         ResourceId id = reference->id.value();
         auto cacheIter = mMapping->find(id);
         if (cacheIter != mMapping->end()) {
             reference->name = cacheIter->second;
             reference->id = {};
         }
     }
 };

 } // namespace

 BinaryResourceParser::BinaryResourceParser(IAaptContext* context, ResourceTable* table,
                                            const Source& source, const void* data, size_t len) :
         mContext(context), mTable(table), mSource(source), mData(data), mDataLen(len) {
 }

 bool BinaryResourceParser::parse() {
     ResChunkPullParser parser(mData, mDataLen);

     bool error = false;
     while(ResChunkPullParser::isGoodEvent(parser.next())) {
         if (parser.getChunk()->type != android::RES_TABLE_TYPE) {
             mContext->getDiagnostics()->warn(DiagMessage(mSource)
                                              << "unknown chunk of type '"
                                              << (int) parser.getChunk()->type << "'");
             continue;
         }

         if (!parseTable(parser.getChunk())) {
             error = true;
         }
     }

     if (parser.getEvent() == ResChunkPullParser::Event::BadDocument) {
         mContext->getDiagnostics()->error(DiagMessage(mSource)
                                           << "corrupt resource table: "
                                           << parser.getLastError());
         return false;
     }
     return !error;
 }

 /**
  * Parses the resource table, which contains all the packages, types, and entries.
  */
 bool BinaryResourceParser::parseTable(const ResChunk_header* chunk) {
     const ResTable_header* tableHeader = convertTo<ResTable_header>(chunk);
     if (!tableHeader) {
         mContext->getDiagnostics()->error(DiagMessage(mSource) << "corrupt ResTable_header chunk");
         return false;
     }

     ResChunkPullParser parser(getChunkData(&tableHeader->header),
                               getChunkDataLen(&tableHeader->header));
     while (ResChunkPullParser::isGoodEvent(parser.next())) {
         switch (util::deviceToHost16(parser.getChunk()->type)) {
         case android::RES_STRING_POOL_TYPE:
             if (mValuePool.getError() == NO_INIT) {
                 status_t err = mValuePool.setTo(parser.getChunk(),
                                                 util::deviceToHost32(parser.getChunk()->size));
                 if (err != NO_ERROR) {
                     mContext->getDiagnostics()->error(DiagMessage(mSource)
                                                       << "corrupt string pool in ResTable: "
                                                       << mValuePool.getError());
                     return false;
                 }

                 // Reserve some space for the strings we are going to add.
                 mTable->stringPool.hintWillAdd(mValuePool.size(), mValuePool.styleCount());
             } else {
                 mContext->getDiagnostics()->warn(DiagMessage(mSource)
                                                  << "unexpected string pool in ResTable");
             }
             break;

         case android::RES_TABLE_PACKAGE_TYPE:
             if (!parsePackage(parser.getChunk())) {
                 return false;
             }
             break;

         default:
             mContext->getDiagnostics()
                     ->warn(DiagMessage(mSource)
                            << "unexpected chunk type "
                            << (int) util::deviceToHost16(parser.getChunk()->type));
             break;
         }
     }

     if (parser.getEvent() == ResChunkPullParser::Event::BadDocument) {
         mContext->getDiagnostics()->error(DiagMessage(mSource)
                                           << "corrupt resource table: " << parser.getLastError());
         return false;
     }
     return true;
 }


 bool BinaryResourceParser::parsePackage(const ResChunk_header* chunk) {
     const ResTable_package* packageHeader = convertTo<ResTable_package>(chunk);
     if (!packageHeader) {
         mContext->getDiagnostics()->error(DiagMessage(mSource)
                                           << "corrupt ResTable_package chunk");
         return false;
     }

     uint32_t packageId = util::deviceToHost32(packageHeader->id);
     if (packageId > std::numeric_limits<uint8_t>::max()) {
         mContext->getDiagnostics()->error(DiagMessage(mSource)
                                           << "package ID is too big (" << packageId << ")");
         return false;
     }

     // Extract the package name.
     size_t len = strnlen16((const char16_t*) packageHeader->name, arraysize(packageHeader->name));
     std::u16string packageName;
     packageName.resize(len);
     for (size_t i = 0; i < len; i++) {
         packageName[i] = util::deviceToHost16(packageHeader->name[i]);
     }

     ResourceTablePackage* package = mTable->createPackage(packageName, (uint8_t) packageId);
     if (!package) {
         mContext->getDiagnostics()->error(DiagMessage(mSource)
                                           << "incompatible package '" << packageName
                                           << "' with ID " << packageId);
         return false;
     }

     // There can be multiple packages in a table, so
     // clear the type and key pool in case they were set from a previous package.
     mTypePool.uninit();
     mKeyPool.uninit();

     ResChunkPullParser parser(getChunkData(&packageHeader->header),
                               getChunkDataLen(&packageHeader->header));
     while (ResChunkPullParser::isGoodEvent(parser.next())) {
         switch (util::deviceToHost16(parser.getChunk()->type)) {
         case android::RES_STRING_POOL_TYPE:
             if (mTypePool.getError() == NO_INIT) {
                 status_t err = mTypePool.setTo(parser.getChunk(),
                                                util::deviceToHost32(parser.getChunk()->size));
                 if (err != NO_ERROR) {
                     mContext->getDiagnostics()->error(DiagMessage(mSource)
                                                       << "corrupt type string pool in "
                                                       << "ResTable_package: "
                                                       << mTypePool.getError());
                     return false;
                 }
             } else if (mKeyPool.getError() == NO_INIT) {
                 status_t err = mKeyPool.setTo(parser.getChunk(),
                                               util::deviceToHost32(parser.getChunk()->size));
                 if (err != NO_ERROR) {
                     mContext->getDiagnostics()->error(DiagMessage(mSource)
                                                       << "corrupt key string pool in "
                                                       << "ResTable_package: "
                                                       << mKeyPool.getError());
                     return false;
                 }
             } else {
                 mContext->getDiagnostics()->warn(DiagMessage(mSource) << "unexpected string pool");
             }
             break;

         case android::RES_TABLE_TYPE_SPEC_TYPE:
             if (!parseTypeSpec(parser.getChunk())) {
                 return false;
             }
             break;

         case android::RES_TABLE_TYPE_TYPE:
             if (!parseType(package, parser.getChunk())) {
                 return false;
             }
             break;

         default:
             mContext->getDiagnostics()
                     ->warn(DiagMessage(mSource)
                            << "unexpected chunk type "
                            << (int) util::deviceToHost16(parser.getChunk()->type));
             break;
         }
     }

     if (parser.getEvent() == ResChunkPullParser::Event::BadDocument) {
         mContext->getDiagnostics()->error(DiagMessage(mSource)
                                           << "corrupt ResTable_package: "
                                           << parser.getLastError());
         return false;
     }

     // Now go through the table and change local resource ID references to
     // symbolic references.
     ReferenceIdToNameVisitor visitor(&mIdIndex);
     visitAllValuesInTable(mTable, &visitor);
     return true;
 }

 bool BinaryResourceParser::parseTypeSpec(const ResChunk_header* chunk) {
     if (mTypePool.getError() != NO_ERROR) {
         mContext->getDiagnostics()->error(DiagMessage(mSource)
                                           << "missing type string pool");
         return false;
     }

     const ResTable_typeSpec* typeSpec = convertTo<ResTable_typeSpec>(chunk);
     if (!typeSpec) {
         mContext->getDiagnostics()->error(DiagMessage(mSource)
                                           << "corrupt ResTable_typeSpec chunk");
         return false;
     }

     if (typeSpec->id == 0) {
         mContext->getDiagnostics()->error(DiagMessage(mSource)
                                           << "ResTable_typeSpec has invalid id: " << typeSpec->id);
         return false;
     }
     return true;
 }

 bool BinaryResourceParser::parseType(const ResourceTablePackage* package,
                                      const ResChunk_header* chunk) {
     if (mTypePool.getError() != NO_ERROR) {
         mContext->getDiagnostics()->error(DiagMessage(mSource)
                                           << "missing type string pool");
         return false;
     }

     if (mKeyPool.getError() != NO_ERROR) {
         mContext->getDiagnostics()->error(DiagMessage(mSource)
                                           << "missing key string pool");
         return false;
     }

     const ResTable_type* type = convertTo<ResTable_type>(chunk);
     if (!type) {
         mContext->getDiagnostics()->error(DiagMessage(mSource)
                                           << "corrupt ResTable_type chunk");
         return false;
     }

     if (type->id == 0) {
         mContext->getDiagnostics()->error(DiagMessage(mSource)
                                           << "ResTable_type has invalid id: " << (int) type->id);
         return false;
     }

     ConfigDescription config;
     config.copyFromDtoH(type->config);

     StringPiece16 typeStr16 = util::getString(mTypePool, type->id - 1);

     const ResourceType* parsedType = parseResourceType(typeStr16);
     if (!parsedType) {
         mContext->getDiagnostics()->error(DiagMessage(mSource)
                                           << "invalid type name '" << typeStr16
                                           << "' for type with ID " << (int) type->id);
         return false;
     }

     TypeVariant tv(type);
     for (auto it = tv.beginEntries(); it != tv.endEntries(); ++it) {
         const ResTable_entry* entry = *it;
         if (!entry) {
             continue;
         }

         const ResourceName name(package->name, *parsedType,
                                 util::getString(mKeyPool,
                                                 util::deviceToHost32(entry->key.index)).toString());

         const ResourceId resId(package->id.value(), type->id, static_cast<uint16_t>(it.index()));

         std::unique_ptr<Value> resourceValue;
         if (entry->flags & ResTable_entry::FLAG_COMPLEX) {
             const ResTable_map_entry* mapEntry = static_cast<const ResTable_map_entry*>(entry);

             // TODO(adamlesinski): Check that the entry count is valid.
             resourceValue = parseMapEntry(name, config, mapEntry);
         } else {
             const Res_value* value = (const Res_value*)(
                     (const uint8_t*) entry + util::deviceToHost32(entry->size));
             resourceValue = parseValue(name, config, value, entry->flags);
         }

         if (!resourceValue) {
             mContext->getDiagnostics()->error(DiagMessage(mSource)
                                               << "failed to parse value for resource " << name
                                               << " (" << resId << ") with configuration '"
                                               << config << "'");
             return false;
         }

         if (!mTable->addResourceAllowMangled(name, config, {}, std::move(resourceValue),
                                              mContext->getDiagnostics())) {
             return false;
         }

         if ((entry->flags & ResTable_entry::FLAG_PUBLIC) != 0) {
             Symbol symbol;
             symbol.state = SymbolState::kPublic;
             symbol.source = mSource.withLine(0);
             if (!mTable->setSymbolStateAllowMangled(name, resId, symbol,
                                                     mContext->getDiagnostics())) {
                 return false;
             }
         }

         // Add this resource name->id mapping to the index so
         // that we can resolve all ID references to name references.
         auto cacheIter = mIdIndex.find(resId);
         if (cacheIter == mIdIndex.end()) {
             mIdIndex.insert({ resId, name });
         }
     }
     return true;
 }

 std::unique_ptr<Item> BinaryResourceParser::parseValue(const ResourceNameRef& name,
                                                        const ConfigDescription& config,
                                                        const Res_value* value,
                                                        uint16_t flags) {
     if (name.type == ResourceType::kId) {
         return util::make_unique<Id>();
     }

     const uint32_t data = util::deviceToHost32(value->data);

     if (value->dataType == Res_value::TYPE_STRING) {
         StringPiece16 str = util::getString(mValuePool, data);

         const ResStringPool_span* spans = mValuePool.styleAt(data);

         // Check if the string has a valid style associated with it.
         if (spans != nullptr && spans->name.index != ResStringPool_span::END) {
             StyleString styleStr = { str.toString() };
             while (spans->name.index != ResStringPool_span::END) {
                 styleStr.spans.push_back(Span{
                         util::getString(mValuePool, spans->name.index).toString(),
                         spans->firstChar,
                         spans->lastChar
                 });
                 spans++;
             }
             return util::make_unique<StyledString>(mTable->stringPool.makeRef(
                     styleStr, StringPool::Context{1, config}));
         } else {
             if (name.type != ResourceType::kString &&
                     util::stringStartsWith<char16_t>(str, u"res/")) {
                 // This must be a FileReference.
                 return util::make_unique<FileReference>(mTable->stringPool.makeRef(
                             str, StringPool::Context{ 0, config }));
             }

             // There are no styles associated with this string, so treat it as
             // a simple string.
             return util::make_unique<String>(mTable->stringPool.makeRef(
                     str, StringPool::Context{1, config}));
         }
     }

     if (value->dataType == Res_value::TYPE_REFERENCE ||
             value->dataType == Res_value::TYPE_ATTRIBUTE) {
         const Reference::Type type = (value->dataType == Res_value::TYPE_REFERENCE) ?
                 Reference::Type::kResource : Reference::Type::kAttribute;

         if (data == 0) {
             // A reference of 0, must be the magic @null reference.
             Res_value nullType = {};
             nullType.dataType = Res_value::TYPE_REFERENCE;
             return util::make_unique<BinaryPrimitive>(nullType);
         }

         // This is a normal reference.
         return util::make_unique<Reference>(data, type);
     }

     // Treat this as a raw binary primitive.
     return util::make_unique<BinaryPrimitive>(*value);
 }

 std::unique_ptr<Value> BinaryResourceParser::parseMapEntry(const ResourceNameRef& name,
                                                            const ConfigDescription& config,
                                                            const ResTable_map_entry* map) {
     switch (name.type) {
         case ResourceType::kStyle:
             return parseStyle(name, config, map);
         case ResourceType::kAttrPrivate:
             // fallthrough
         case ResourceType::kAttr:
             return parseAttr(name, config, map);
         case ResourceType::kArray:
             return parseArray(name, config, map);
         case ResourceType::kPlurals:
             return parsePlural(name, config, map);
         default:
             assert(false && "unknown map type");
             break;
     }
     return {};
 }

 std::unique_ptr<Style> BinaryResourceParser::parseStyle(const ResourceNameRef& name,
                                                         const ConfigDescription& config,
                                                         const ResTable_map_entry* map) {
     std::unique_ptr<Style> style = util::make_unique<Style>();
     if (util::deviceToHost32(map->parent.ident) != 0) {
         // The parent is a regular reference to a resource.
         style->parent = Reference(util::deviceToHost32(map->parent.ident));
     }

     for (const ResTable_map& mapEntry : map) {
         if (Res_INTERNALID(util::deviceToHost32(mapEntry.name.ident))) {
             continue;
         }

         Style::Entry styleEntry;
         styleEntry.key = Reference(util::deviceToHost32(mapEntry.name.ident));
         styleEntry.value = parseValue(name, config, &mapEntry.value, 0);
         if (!styleEntry.value) {
             return {};
         }
         style->entries.push_back(std::move(styleEntry));
     }
     return style;
 }

 std::unique_ptr<Attribute> BinaryResourceParser::parseAttr(const ResourceNameRef& name,
                                                            const ConfigDescription& config,
                                                            const ResTable_map_entry* map) {
     const bool isWeak = (util::deviceToHost16(map->flags) & ResTable_entry::FLAG_WEAK) != 0;
     std::unique_ptr<Attribute> attr = util::make_unique<Attribute>(isWeak);

     // First we must discover what type of attribute this is. Find the type mask.
     auto typeMaskIter = std::find_if(begin(map), end(map), [](const ResTable_map& entry) -> bool {
         return util::deviceToHost32(entry.name.ident) == ResTable_map::ATTR_TYPE;
     });

     if (typeMaskIter != end(map)) {
         attr->typeMask = util::deviceToHost32(typeMaskIter->value.data);
     }

     for (const ResTable_map& mapEntry : map) {
         if (Res_INTERNALID(util::deviceToHost32(mapEntry.name.ident))) {
             switch (util::deviceToHost32(mapEntry.name.ident)) {
             case ResTable_map::ATTR_MIN:
                 attr->minInt = static_cast<int32_t>(mapEntry.value.data);
                 break;
             case ResTable_map::ATTR_MAX:
                 attr->maxInt = static_cast<int32_t>(mapEntry.value.data);
                 break;
             }
             continue;
         }

         if (attr->typeMask & (ResTable_map::TYPE_ENUM | ResTable_map::TYPE_FLAGS)) {
             Attribute::Symbol symbol;
             symbol.value = util::deviceToHost32(mapEntry.value.data);
             symbol.symbol = Reference(util::deviceToHost32(mapEntry.name.ident));
             attr->symbols.push_back(std::move(symbol));
         }
     }

     // TODO(adamlesinski): Find i80n, attributes.
     return attr;
 }

 std::unique_ptr<Array> BinaryResourceParser::parseArray(const ResourceNameRef& name,
                                                         const ConfigDescription& config,
                                                         const ResTable_map_entry* map) {
     std::unique_ptr<Array> array = util::make_unique<Array>();
     for (const ResTable_map& mapEntry : map) {
         array->items.push_back(parseValue(name, config, &mapEntry.value, 0));
     }
     return array;
 }

 std::unique_ptr<Plural> BinaryResourceParser::parsePlural(const ResourceNameRef& name,
                                                           const ConfigDescription& config,
                                                           const ResTable_map_entry* map) {
     std::unique_ptr<Plural> plural = util::make_unique<Plural>();
     for (const ResTable_map& mapEntry : map) {
         std::unique_ptr<Item> item = parseValue(name, config, &mapEntry.value, 0);
         if (!item) {
             return {};
         }

         switch (util::deviceToHost32(mapEntry.name.ident)) {
             case ResTable_map::ATTR_ZERO:
                 plural->values[Plural::Zero] = std::move(item);
                 break;
             case ResTable_map::ATTR_ONE:
                 plural->values[Plural::One] = std::move(item);
                 break;
             case ResTable_map::ATTR_TWO:
                 plural->values[Plural::Two] = std::move(item);
                 break;
             case ResTable_map::ATTR_FEW:
                 plural->values[Plural::Few] = std::move(item);
                 break;
             case ResTable_map::ATTR_MANY:
                 plural->values[Plural::Many] = std::move(item);
                 break;
             case ResTable_map::ATTR_OTHER:
                 plural->values[Plural::Other] = std::move(item);
                 break;
         }
     }
     return plural;
 }

 } // 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 "ResourceTable.h"
	#include "ResourceUtils.h"
	#include "ResourceValues.h"
	#include "Source.h"
	#include "ValueVisitor.h"
	#include "unflatten/BinaryResourceParser.h"
	#include "unflatten/ResChunkPullParser.h"
	#include "util/Util.h"

	#include <androidfw/ResourceTypes.h>
	#include <androidfw/TypeWrappers.h>
	#include <android-base/macros.h>
	#include <algorithm>
	#include <map>
	#include <string>

	namespace aapt {

	using namespace android;

	namespace {

	/*
	* Visitor that converts a reference's resource ID to a resource name,
	* given a mapping from resource ID to resource name.
	*/
	class ReferenceIdToNameVisitor : public ValueVisitor {
	private:
	const std::map<ResourceId, ResourceName>* mMapping;

	public:
	using ValueVisitor::visit;

	ReferenceIdToNameVisitor(const std::map<ResourceId, ResourceName>* mapping) :
	mMapping(mapping) {
	assert(mMapping);
	}

	void visit(Reference* reference) override {
	if (!reference->id \|\| !reference->id.value().isValid()) {
	return;
	}

	ResourceId id = reference->id.value();
	auto cacheIter = mMapping->find(id);
	if (cacheIter != mMapping->end()) {
	reference->name = cacheIter->second;
	reference->id = {};
	}
	}
	};

	} // namespace

	BinaryResourceParser::BinaryResourceParser(IAaptContext* context, ResourceTable* table,
	const Source& source, const void* data, size_t len) :
	mContext(context), mTable(table), mSource(source), mData(data), mDataLen(len) {
	}

	bool BinaryResourceParser::parse() {
	ResChunkPullParser parser(mData, mDataLen);

	bool error = false;
	while(ResChunkPullParser::isGoodEvent(parser.next())) {
	if (parser.getChunk()->type != android::RES_TABLE_TYPE) {
	mContext->getDiagnostics()->warn(DiagMessage(mSource)
	<< "unknown chunk of type '"
	<< (int) parser.getChunk()->type << "'");
	continue;
	}

	if (!parseTable(parser.getChunk())) {
	error = true;
	}
	}

	if (parser.getEvent() == ResChunkPullParser::Event::BadDocument) {
	mContext->getDiagnostics()->error(DiagMessage(mSource)
	<< "corrupt resource table: "
	<< parser.getLastError());
	return false;
	}
	return !error;
	}

	/**
	* Parses the resource table, which contains all the packages, types, and entries.
	*/
	bool BinaryResourceParser::parseTable(const ResChunk_header* chunk) {
	const ResTable_header* tableHeader = convertTo<ResTable_header>(chunk);
	if (!tableHeader) {
	mContext->getDiagnostics()->error(DiagMessage(mSource) << "corrupt ResTable_header chunk");
	return false;
	}

	ResChunkPullParser parser(getChunkData(&tableHeader->header),
	getChunkDataLen(&tableHeader->header));
	while (ResChunkPullParser::isGoodEvent(parser.next())) {
	switch (util::deviceToHost16(parser.getChunk()->type)) {
	case android::RES_STRING_POOL_TYPE:
	if (mValuePool.getError() == NO_INIT) {
	status_t err = mValuePool.setTo(parser.getChunk(),
	util::deviceToHost32(parser.getChunk()->size));
	if (err != NO_ERROR) {
	mContext->getDiagnostics()->error(DiagMessage(mSource)
	<< "corrupt string pool in ResTable: "
	<< mValuePool.getError());
	return false;
	}

	// Reserve some space for the strings we are going to add.
	mTable->stringPool.hintWillAdd(mValuePool.size(), mValuePool.styleCount());
	} else {
	mContext->getDiagnostics()->warn(DiagMessage(mSource)
	<< "unexpected string pool in ResTable");
	}
	break;

	case android::RES_TABLE_PACKAGE_TYPE:
	if (!parsePackage(parser.getChunk())) {
	return false;
	}
	break;

	default:
	mContext->getDiagnostics()
	->warn(DiagMessage(mSource)
	<< "unexpected chunk type "
	<< (int) util::deviceToHost16(parser.getChunk()->type));
	break;
	}
	}

	if (parser.getEvent() == ResChunkPullParser::Event::BadDocument) {
	mContext->getDiagnostics()->error(DiagMessage(mSource)
	<< "corrupt resource table: " << parser.getLastError());
	return false;
	}
	return true;
	}


	bool BinaryResourceParser::parsePackage(const ResChunk_header* chunk) {
	const ResTable_package* packageHeader = convertTo<ResTable_package>(chunk);
	if (!packageHeader) {
	mContext->getDiagnostics()->error(DiagMessage(mSource)
	<< "corrupt ResTable_package chunk");
	return false;
	}

	uint32_t packageId = util::deviceToHost32(packageHeader->id);
	if (packageId > std::numeric_limits<uint8_t>::max()) {
	mContext->getDiagnostics()->error(DiagMessage(mSource)
	<< "package ID is too big (" << packageId << ")");
	return false;
	}

	// Extract the package name.
	size_t len = strnlen16((const char16_t*) packageHeader->name, arraysize(packageHeader->name));
	std::u16string packageName;
	packageName.resize(len);
	for (size_t i = 0; i < len; i++) {
	packageName[i] = util::deviceToHost16(packageHeader->name[i]);
	}

	ResourceTablePackage* package = mTable->createPackage(packageName, (uint8_t) packageId);
	if (!package) {
	mContext->getDiagnostics()->error(DiagMessage(mSource)
	<< "incompatible package '" << packageName
	<< "' with ID " << packageId);
	return false;
	}

	// There can be multiple packages in a table, so
	// clear the type and key pool in case they were set from a previous package.
	mTypePool.uninit();
	mKeyPool.uninit();

	ResChunkPullParser parser(getChunkData(&packageHeader->header),
	getChunkDataLen(&packageHeader->header));
	while (ResChunkPullParser::isGoodEvent(parser.next())) {
	switch (util::deviceToHost16(parser.getChunk()->type)) {
	case android::RES_STRING_POOL_TYPE:
	if (mTypePool.getError() == NO_INIT) {
	status_t err = mTypePool.setTo(parser.getChunk(),
	util::deviceToHost32(parser.getChunk()->size));
	if (err != NO_ERROR) {
	mContext->getDiagnostics()->error(DiagMessage(mSource)
	<< "corrupt type string pool in "
	<< "ResTable_package: "
	<< mTypePool.getError());
	return false;
	}
	} else if (mKeyPool.getError() == NO_INIT) {
	status_t err = mKeyPool.setTo(parser.getChunk(),
	util::deviceToHost32(parser.getChunk()->size));
	if (err != NO_ERROR) {
	mContext->getDiagnostics()->error(DiagMessage(mSource)
	<< "corrupt key string pool in "
	<< "ResTable_package: "
	<< mKeyPool.getError());
	return false;
	}
	} else {
	mContext->getDiagnostics()->warn(DiagMessage(mSource) << "unexpected string pool");
	}
	break;

	case android::RES_TABLE_TYPE_SPEC_TYPE:
	if (!parseTypeSpec(parser.getChunk())) {
	return false;
	}
	break;

	case android::RES_TABLE_TYPE_TYPE:
	if (!parseType(package, parser.getChunk())) {
	return false;
	}
	break;

	default:
	mContext->getDiagnostics()
	->warn(DiagMessage(mSource)
	<< "unexpected chunk type "
	<< (int) util::deviceToHost16(parser.getChunk()->type));
	break;
	}
	}

	if (parser.getEvent() == ResChunkPullParser::Event::BadDocument) {
	mContext->getDiagnostics()->error(DiagMessage(mSource)
	<< "corrupt ResTable_package: "
	<< parser.getLastError());
	return false;
	}

	// Now go through the table and change local resource ID references to
	// symbolic references.
	ReferenceIdToNameVisitor visitor(&mIdIndex);
	visitAllValuesInTable(mTable, &visitor);
	return true;
	}

	bool BinaryResourceParser::parseTypeSpec(const ResChunk_header* chunk) {
	if (mTypePool.getError() != NO_ERROR) {
	mContext->getDiagnostics()->error(DiagMessage(mSource)
	<< "missing type string pool");
	return false;
	}

	const ResTable_typeSpec* typeSpec = convertTo<ResTable_typeSpec>(chunk);
	if (!typeSpec) {
	mContext->getDiagnostics()->error(DiagMessage(mSource)
	<< "corrupt ResTable_typeSpec chunk");
	return false;
	}

	if (typeSpec->id == 0) {
	mContext->getDiagnostics()->error(DiagMessage(mSource)
	<< "ResTable_typeSpec has invalid id: " << typeSpec->id);
	return false;
	}
	return true;
	}

	bool BinaryResourceParser::parseType(const ResourceTablePackage* package,
	const ResChunk_header* chunk) {
	if (mTypePool.getError() != NO_ERROR) {
	mContext->getDiagnostics()->error(DiagMessage(mSource)
	<< "missing type string pool");
	return false;
	}

	if (mKeyPool.getError() != NO_ERROR) {
	mContext->getDiagnostics()->error(DiagMessage(mSource)
	<< "missing key string pool");
	return false;
	}

	const ResTable_type* type = convertTo<ResTable_type>(chunk);
	if (!type) {
	mContext->getDiagnostics()->error(DiagMessage(mSource)
	<< "corrupt ResTable_type chunk");
	return false;
	}

	if (type->id == 0) {
	mContext->getDiagnostics()->error(DiagMessage(mSource)
	<< "ResTable_type has invalid id: " << (int) type->id);
	return false;
	}

	ConfigDescription config;
	config.copyFromDtoH(type->config);

	StringPiece16 typeStr16 = util::getString(mTypePool, type->id - 1);

	const ResourceType* parsedType = parseResourceType(typeStr16);
	if (!parsedType) {
	mContext->getDiagnostics()->error(DiagMessage(mSource)
	<< "invalid type name '" << typeStr16
	<< "' for type with ID " << (int) type->id);
	return false;
	}

	TypeVariant tv(type);
	for (auto it = tv.beginEntries(); it != tv.endEntries(); ++it) {
	const ResTable_entry* entry = *it;
	if (!entry) {
	continue;
	}

	const ResourceName name(package->name, *parsedType,
	util::getString(mKeyPool,
	util::deviceToHost32(entry->key.index)).toString());

	const ResourceId resId(package->id.value(), type->id, static_cast<uint16_t>(it.index()));

	std::unique_ptr<Value> resourceValue;
	if (entry->flags & ResTable_entry::FLAG_COMPLEX) {
	const ResTable_map_entry* mapEntry = static_cast<const ResTable_map_entry*>(entry);

	// TODO(adamlesinski): Check that the entry count is valid.
	resourceValue = parseMapEntry(name, config, mapEntry);
	} else {
	const Res_value* value = (const Res_value*)(
	(const uint8_t*) entry + util::deviceToHost32(entry->size));
	resourceValue = parseValue(name, config, value, entry->flags);
	}

	if (!resourceValue) {
	mContext->getDiagnostics()->error(DiagMessage(mSource)
	<< "failed to parse value for resource " << name
	<< " (" << resId << ") with configuration '"
	<< config << "'");
	return false;
	}

	if (!mTable->addResourceAllowMangled(name, config, {}, std::move(resourceValue),
	mContext->getDiagnostics())) {
	return false;
	}

	if ((entry->flags & ResTable_entry::FLAG_PUBLIC) != 0) {
	Symbol symbol;
	symbol.state = SymbolState::kPublic;
	symbol.source = mSource.withLine(0);
	if (!mTable->setSymbolStateAllowMangled(name, resId, symbol,
	mContext->getDiagnostics())) {
	return false;
	}
	}

	// Add this resource name->id mapping to the index so
	// that we can resolve all ID references to name references.
	auto cacheIter = mIdIndex.find(resId);
	if (cacheIter == mIdIndex.end()) {
	mIdIndex.insert({ resId, name });
	}
	}
	return true;
	}

	std::unique_ptr<Item> BinaryResourceParser::parseValue(const ResourceNameRef& name,
	const ConfigDescription& config,
	const Res_value* value,
	uint16_t flags) {
	if (name.type == ResourceType::kId) {
	return util::make_unique<Id>();
	}

	const uint32_t data = util::deviceToHost32(value->data);

	if (value->dataType == Res_value::TYPE_STRING) {
	StringPiece16 str = util::getString(mValuePool, data);

	const ResStringPool_span* spans = mValuePool.styleAt(data);

	// Check if the string has a valid style associated with it.
	if (spans != nullptr && spans->name.index != ResStringPool_span::END) {
	StyleString styleStr = { str.toString() };
	while (spans->name.index != ResStringPool_span::END) {
	styleStr.spans.push_back(Span{
	util::getString(mValuePool, spans->name.index).toString(),
	spans->firstChar,
	spans->lastChar
	});
	spans++;
	}
	return util::make_unique<StyledString>(mTable->stringPool.makeRef(
	styleStr, StringPool::Context{1, config}));
	} else {
	if (name.type != ResourceType::kString &&
	util::stringStartsWith<char16_t>(str, u"res/")) {
	// This must be a FileReference.
	return util::make_unique<FileReference>(mTable->stringPool.makeRef(
	str, StringPool::Context{ 0, config }));
	}

	// There are no styles associated with this string, so treat it as
	// a simple string.
	return util::make_unique<String>(mTable->stringPool.makeRef(
	str, StringPool::Context{1, config}));
	}
	}

	if (value->dataType == Res_value::TYPE_REFERENCE \|\|
	value->dataType == Res_value::TYPE_ATTRIBUTE) {
	const Reference::Type type = (value->dataType == Res_value::TYPE_REFERENCE) ?
	Reference::Type::kResource : Reference::Type::kAttribute;

	if (data == 0) {
	// A reference of 0, must be the magic @null reference.
	Res_value nullType = {};
	nullType.dataType = Res_value::TYPE_REFERENCE;
	return util::make_unique<BinaryPrimitive>(nullType);
	}

	// This is a normal reference.
	return util::make_unique<Reference>(data, type);
	}

	// Treat this as a raw binary primitive.
	return util::make_unique<BinaryPrimitive>(*value);
	}

	std::unique_ptr<Value> BinaryResourceParser::parseMapEntry(const ResourceNameRef& name,
	const ConfigDescription& config,
	const ResTable_map_entry* map) {
	switch (name.type) {
	case ResourceType::kStyle:
	return parseStyle(name, config, map);
	case ResourceType::kAttrPrivate:
	// fallthrough
	case ResourceType::kAttr:
	return parseAttr(name, config, map);
	case ResourceType::kArray:
	return parseArray(name, config, map);
	case ResourceType::kPlurals:
	return parsePlural(name, config, map);
	default:
	assert(false && "unknown map type");
	break;
	}
	return {};
	}

	std::unique_ptr<Style> BinaryResourceParser::parseStyle(const ResourceNameRef& name,
	const ConfigDescription& config,
	const ResTable_map_entry* map) {
	std::unique_ptr<Style> style = util::make_unique<Style>();
	if (util::deviceToHost32(map->parent.ident) != 0) {
	// The parent is a regular reference to a resource.
	style->parent = Reference(util::deviceToHost32(map->parent.ident));
	}

	for (const ResTable_map& mapEntry : map) {
	if (Res_INTERNALID(util::deviceToHost32(mapEntry.name.ident))) {
	continue;
	}

	Style::Entry styleEntry;
	styleEntry.key = Reference(util::deviceToHost32(mapEntry.name.ident));
	styleEntry.value = parseValue(name, config, &mapEntry.value, 0);
	if (!styleEntry.value) {
	return {};
	}
	style->entries.push_back(std::move(styleEntry));
	}
	return style;
	}

	std::unique_ptr<Attribute> BinaryResourceParser::parseAttr(const ResourceNameRef& name,
	const ConfigDescription& config,
	const ResTable_map_entry* map) {
	const bool isWeak = (util::deviceToHost16(map->flags) & ResTable_entry::FLAG_WEAK) != 0;
	std::unique_ptr<Attribute> attr = util::make_unique<Attribute>(isWeak);

	// First we must discover what type of attribute this is. Find the type mask.
	auto typeMaskIter = std::find_if(begin(map), end(map), [](const ResTable_map& entry) -> bool {
	return util::deviceToHost32(entry.name.ident) == ResTable_map::ATTR_TYPE;
	});

	if (typeMaskIter != end(map)) {
	attr->typeMask = util::deviceToHost32(typeMaskIter->value.data);
	}

	for (const ResTable_map& mapEntry : map) {
	if (Res_INTERNALID(util::deviceToHost32(mapEntry.name.ident))) {
	switch (util::deviceToHost32(mapEntry.name.ident)) {
	case ResTable_map::ATTR_MIN:
	attr->minInt = static_cast<int32_t>(mapEntry.value.data);
	break;
	case ResTable_map::ATTR_MAX:
	attr->maxInt = static_cast<int32_t>(mapEntry.value.data);
	break;
	}
	continue;
	}

	if (attr->typeMask & (ResTable_map::TYPE_ENUM \| ResTable_map::TYPE_FLAGS)) {
	Attribute::Symbol symbol;
	symbol.value = util::deviceToHost32(mapEntry.value.data);
	symbol.symbol = Reference(util::deviceToHost32(mapEntry.name.ident));
	attr->symbols.push_back(std::move(symbol));
	}
	}

	// TODO(adamlesinski): Find i80n, attributes.
	return attr;
	}

	std::unique_ptr<Array> BinaryResourceParser::parseArray(const ResourceNameRef& name,
	const ConfigDescription& config,
	const ResTable_map_entry* map) {
	std::unique_ptr<Array> array = util::make_unique<Array>();
	for (const ResTable_map& mapEntry : map) {
	array->items.push_back(parseValue(name, config, &mapEntry.value, 0));
	}
	return array;
	}

	std::unique_ptr<Plural> BinaryResourceParser::parsePlural(const ResourceNameRef& name,
	const ConfigDescription& config,
	const ResTable_map_entry* map) {
	std::unique_ptr<Plural> plural = util::make_unique<Plural>();
	for (const ResTable_map& mapEntry : map) {
	std::unique_ptr<Item> item = parseValue(name, config, &mapEntry.value, 0);
	if (!item) {
	return {};
	}

	switch (util::deviceToHost32(mapEntry.name.ident)) {
	case ResTable_map::ATTR_ZERO:
	plural->values[Plural::Zero] = std::move(item);
	break;
	case ResTable_map::ATTR_ONE:
	plural->values[Plural::One] = std::move(item);
	break;
	case ResTable_map::ATTR_TWO:
	plural->values[Plural::Two] = std::move(item);
	break;
	case ResTable_map::ATTR_FEW:
	plural->values[Plural::Few] = std::move(item);
	break;
	case ResTable_map::ATTR_MANY:
	plural->values[Plural::Many] = std::move(item);
	break;
	case ResTable_map::ATTR_OTHER:
	plural->values[Plural::Other] = std::move(item);
	break;
	}
	}
	return plural;
	}

	} // namespace aapt