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/*
* 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 "Maybe.h"
#include "NameMangler.h"
#include "Resource.h"
#include "ResourceTable.h"
#include "ResourceTableResolver.h"
#include "ResourceValues.h"
#include "Util.h"
#include <androidfw/AssetManager.h>
#include <androidfw/ResourceTypes.h>
#include <memory>
#include <vector>
namespace aapt {
ResourceTableResolver::ResourceTableResolver(
std::shared_ptr<const ResourceTable> table,
const std::vector<std::shared_ptr<const android::AssetManager>>& sources) :
mTable(table), mSources(sources) {
for (const auto& assetManager : mSources) {
const android::ResTable& resTable = assetManager->getResources(false);
const size_t packageCount = resTable.getBasePackageCount();
for (size_t i = 0; i < packageCount; i++) {
std::u16string packageName = resTable.getBasePackageName(i).string();
mIncludedPackages.insert(std::move(packageName));
}
}
}
Maybe<ResourceId> ResourceTableResolver::findId(const ResourceName& name) {
Maybe<Entry> result = findAttribute(name);
if (result) {
return result.value().id;
}
return {};
}
Maybe<IResolver::Entry> ResourceTableResolver::findAttribute(const ResourceName& name) {
auto cacheIter = mCache.find(name);
if (cacheIter != std::end(mCache)) {
return Entry{ cacheIter->second.id, cacheIter->second.attr.get() };
}
ResourceName mangledName;
const ResourceName* nameToSearch = &name;
if (name.package != mTable->getPackage()) {
// This may be a reference to an included resource or
// to a mangled resource.
if (mIncludedPackages.find(name.package) == mIncludedPackages.end()) {
// This is not in our included set, so mangle the name and
// check for that.
mangledName.entry = name.entry;
NameMangler::mangle(name.package, &mangledName.entry);
mangledName.package = mTable->getPackage();
mangledName.type = name.type;
nameToSearch = &mangledName;
} else {
const CacheEntry* cacheEntry = buildCacheEntry(name);
if (cacheEntry) {
return Entry{ cacheEntry->id, cacheEntry->attr.get() };
}
return {};
}
}
const ResourceTableType* type;
const ResourceEntry* entry;
std::tie(type, entry) = mTable->findResource(*nameToSearch);
if (type && entry) {
Entry result = {};
if (mTable->getPackageId() != ResourceTable::kUnsetPackageId &&
type->typeId != ResourceTableType::kUnsetTypeId &&
entry->entryId != ResourceEntry::kUnsetEntryId) {
result.id = ResourceId(mTable->getPackageId(), type->typeId, entry->entryId);
}
if (!entry->values.empty()) {
visitFunc<Attribute>(*entry->values.front().value, [&result](Attribute& attr) {
result.attr = &attr;
});
}
return result;
}
return {};
}
Maybe<ResourceName> ResourceTableResolver::findName(ResourceId resId) {
for (const auto& assetManager : mSources) {
const android::ResTable& table = assetManager->getResources(false);
android::ResTable::resource_name resourceName;
if (!table.getResourceName(resId.id, false, &resourceName)) {
continue;
}
const ResourceType* type = parseResourceType(StringPiece16(resourceName.type,
resourceName.typeLen));
assert(type);
return ResourceName{
{ resourceName.package, resourceName.packageLen },
*type,
{ resourceName.name, resourceName.nameLen } };
}
return {};
}
/**
* This is called when we need to lookup a resource name in the AssetManager.
* Since the values in the AssetManager are not parsed like in a ResourceTable,
* we must create Attribute objects here if we find them.
*/
const ResourceTableResolver::CacheEntry* ResourceTableResolver::buildCacheEntry(
const ResourceName& name) {
for (const auto& assetManager : mSources) {
const android::ResTable& table = assetManager->getResources(false);
const StringPiece16 type16 = toString(name.type);
ResourceId resId {
table.identifierForName(
name.entry.data(), name.entry.size(),
type16.data(), type16.size(),
name.package.data(), name.package.size())
};
if (!resId.isValid()) {
continue;
}
CacheEntry& entry = mCache[name];
entry.id = resId;
//
// Now check to see if this resource is an Attribute.
//
const android::ResTable::bag_entry* bagBegin;
ssize_t bags = table.lockBag(resId.id, &bagBegin);
if (bags < 1) {
table.unlockBag(bagBegin);
return &entry;
}
// Look for the ATTR_TYPE key in the bag and check the types it supports.
uint32_t attrTypeMask = 0;
for (ssize_t i = 0; i < bags; i++) {
if (bagBegin[i].map.name.ident == android::ResTable_map::ATTR_TYPE) {
attrTypeMask = bagBegin[i].map.value.data;
}
}
entry.attr = util::make_unique<Attribute>(false);
if (attrTypeMask & android::ResTable_map::TYPE_ENUM ||
attrTypeMask & android::ResTable_map::TYPE_FLAGS) {
for (ssize_t i = 0; i < bags; i++) {
if (Res_INTERNALID(bagBegin[i].map.name.ident)) {
// Internal IDs are special keys, which are not enum/flag symbols, so skip.
continue;
}
android::ResTable::resource_name symbolName;
bool result = table.getResourceName(bagBegin[i].map.name.ident, false,
&symbolName);
assert(result);
const ResourceType* type = parseResourceType(
StringPiece16(symbolName.type, symbolName.typeLen));
assert(type);
entry.attr->symbols.push_back(Attribute::Symbol{
Reference(ResourceNameRef(
StringPiece16(symbolName.package, symbolName.packageLen),
*type,
StringPiece16(symbolName.name, symbolName.nameLen))),
bagBegin[i].map.value.data
});
}
}
entry.attr->typeMask |= attrTypeMask;
table.unlockBag(bagBegin);
return &entry;
}
return nullptr;
}
} // namespace aapt
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