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AAPT2: Parse an ID encoded as a map

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ID types should not be encoded as a map. AAPT and AAPT2 emit
IDs as boolean types.

Some apps exist that for some reason have their ID types encoded
as empty maps. This is the case only for the auto generated IDs
from enum values in <attr> tags.

Allow IDs as maps and ignore their content when processing an APK
for optimizing.

Also fixes an issue with expected size of the ResTable_package struct.

Bug: 35861796
Test: tested against the APK in b/35861796
Change-Id: I29a19cd9777bb10bed6766cd42e35e50e098797b
This commit is contained in:
Adam Lesinski
2017-03-29 13:00:35 -07:00
parent c463bed8db
commit 33af6c730f
4 changed files with 23 additions and 6 deletions
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4
libs/androidfw/LoadedArsc.cpp
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@@ -416,7 +416,9 @@ std::unique_ptr<LoadedPackage> LoadedPackage::Load(const Chunk& chunk) {
ATRACE_CALL();
std::unique_ptr<LoadedPackage> loaded_package{new LoadedPackage()};
const ResTable_package* header = chunk.header<ResTable_package>();
constexpr size_t kMinPackageSize =
sizeof(ResTable_package) - sizeof(ResTable_package::typeIdOffset);
const ResTable_package* header = chunk.header<ResTable_package, kMinPackageSize>();
if (header == nullptr) {
LOG(ERROR) << "Chunk RES_TABLE_PACKAGE_TYPE is too small.";
return {};

2
tools/aapt2/Main.cpp
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@@ -25,7 +25,7 @@ namespace aapt {
static const char* sMajorVersion = "2";
// Update minor version whenever a feature or flag is added.
static const char* sMinorVersion = "11";
static const char* sMinorVersion = "12";
int PrintVersion() {
std::cerr << "Android Asset Packaging Tool (aapt) " << sMajorVersion << "."

8
tools/aapt2/readme.md
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@@ -1,5 +1,13 @@
# Android Asset Packaging Tool 2.0 (AAPT2) release notes
## Version 2.12
### `aapt2 optimize ...`
- aapt2 optimize now understands map (complex) values under the type `id`. It ignores their
contents and interprets them as a sentinel `id` type. This was added to support existing
apps that build with their `id` types as map values.
AAPT and AAPT2 always generate a simple value for the type `ID`, so it is unclear how some
these apps are encoded.
## Version 2.11
### `aapt2 link ...`
- Adds the ability to specify assets directories with the -A parameter. Assets work just like

15
tools/aapt2/unflatten/BinaryResourceParser.cpp
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@@ -168,10 +168,11 @@ bool BinaryResourceParser::ParseTable(const ResChunk_header* chunk) {
}
bool BinaryResourceParser::ParsePackage(const ResChunk_header* chunk) {
const ResTable_package* package_header = ConvertTo<ResTable_package>(chunk);
constexpr size_t kMinPackageSize =
sizeof(ResTable_package) - sizeof(ResTable_package::typeIdOffset);
const ResTable_package* package_header = ConvertTo<ResTable_package, kMinPackageSize>(chunk);
if (!package_header) {
context_->GetDiagnostics()->Error(DiagMessage(source_)
<< "corrupt ResTable_package chunk");
context_->GetDiagnostics()->Error(DiagMessage(source_) << "corrupt ResTable_package chunk");
return false;
}
@@ -498,8 +499,14 @@ std::unique_ptr<Value> BinaryResourceParser::ParseMapEntry(
return ParseArray(name, config, map);
case ResourceType::kPlurals:
return ParsePlural(name, config, map);
case ResourceType::kId:
// Special case: An ID is not a bag, but some apps have defined the auto-generated
// IDs that come from declaring an enum value in an attribute as an empty map...
// We can ignore the value here.
return util::make_unique<Id>();
default:
LOG(FATAL) << "unknown map type";
context_->GetDiagnostics()->Error(DiagMessage() << "illegal map type '" << ToString(name.type)
<< "' (" << (int)name.type << ")");
break;
}
return {};