Fix aapt dump for APKs with no resources

All APKs are expected to have at least one resource table (even if
it is empty). We were missing the creation of an empty DynamicRefTable.

Bug:16895517
Change-Id: I6a6e887f91b3b4bbcc52b3fd2741ef3d05fab1fd

2 files changed, 25 insertions, 17 deletions

diff --git a/libs/androidfw/ResourceTypes.cpp b/libs/androidfw/ResourceTypes.cpp
index 7661d58..71a7c0a 100644
--- a/libs/androidfw/ResourceTypes.cpp
+++ b/libs/androidfw/ResourceTypes.cpp
@@ -2852,17 +2852,16 @@ struct ResTable::Type
 struct ResTable::Package
 {
     Package(ResTable* _owner, const Header* _header, const ResTable_package* _package)
-        : owner(_owner), header(_header), package(_package), typeIdOffset(0) {
-        if (dtohs(package->header.headerSize) == sizeof(package)) {
+        : owner(_owner), header(_header), typeIdOffset(0) {
+        if (_package != NULL && dtohs(_package->header.headerSize) == sizeof(_package)) {
             // The package structure is the same size as the definition.
             // This means it contains the typeIdOffset field.
-            typeIdOffset = package->typeIdOffset;
+            typeIdOffset = _package->typeIdOffset;
         }
     }
 
     const ResTable* const           owner;
     const Header* const             header;
-    const ResTable_package* const   package;
 
     ResStringPool                   typeStrings;
     ResStringPool                   keyStrings;
@@ -3361,6 +3360,10 @@ status_t ResTable::addEmpty(const int32_t cookie) {
 
     header->header = (const ResTable_header*) resHeader;
     mHeaders.add(header);
+
+    PackageGroup* pg = new PackageGroup(this, String16(), 0);
+    pg->packages.add(new Package(this, header, NULL));
+    mPackageGroups.add(pg);
     return (mError=NO_ERROR);
 }
 
@@ -5929,7 +5932,7 @@ status_t ResTable::createIdmap(const ResTable& overlay,
     *outSize += 2 * sizeof(uint16_t);
 
     // overlay packages are assumed to contain only one package group
-    const String16 overlayPackage(overlay.mPackageGroups[0]->packages[0]->package->name);
+    const String16 overlayPackage(overlay.mPackageGroups[0]->name);
 
     for (size_t typeIndex = 0; typeIndex < pg->types.size(); ++typeIndex) {
         const TypeList& typeList = pg->types[typeIndex];
@@ -6204,11 +6207,6 @@ void ResTable::print(bool inclValues) const
     if (mError != 0) {
         printf("mError=0x%x (%s)\n", mError, strerror(mError));
     }
-#if 0
-    char localeStr[RESTABLE_MAX_LOCALE_LEN];
-    mParams.getBcp47Locale(localeStr);
-    printf("mParams=%s,\n" localeStr);
-#endif
     size_t pgCount = mPackageGroups.size();
     printf("Package Groups (%d)\n", (int)pgCount);
     for (size_t pgIndex=0; pgIndex<pgCount; pgIndex++) {
@@ -6217,13 +6215,6 @@ void ResTable::print(bool inclValues) const
                 (int)pgIndex, pg->id, (int)pg->packages.size(),
                 String8(pg->name).string());
 
-        size_t pkgCount = pg->packages.size();
-        for (size_t pkgIndex=0; pkgIndex<pkgCount; pkgIndex++) {
-            const Package* pkg = pg->packages[pkgIndex];
-            printf("  Package %d id=%d name=%s\n", (int)pkgIndex,
-                    pkg->package->id, String8(String16(pkg->package->name)).string());
-        }
-
         for (size_t typeIndex=0; typeIndex < pg->types.size(); typeIndex++) {
             const TypeList& typeList = pg->types[typeIndex];
             if (typeList.isEmpty()) {
diff --git a/libs/androidfw/tests/ResTable_test.cpp b/libs/androidfw/tests/ResTable_test.cpp
index 8016a82..68c228e 100644
--- a/libs/androidfw/tests/ResTable_test.cpp
+++ b/libs/androidfw/tests/ResTable_test.cpp
@@ -195,4 +195,21 @@ TEST(ResTableTest, resourceIsOverridenWithBetterConfig) {
     ASSERT_EQ(uint32_t(400), val.data);
 }
 
+TEST(ResTableTest, emptyTableHasSensibleDefaults) {
+    const int32_t expectedCookie = 1;
+
+    ResTable table;
+    ASSERT_EQ(NO_ERROR, table.addEmpty(expectedCookie));
+
+    ASSERT_EQ(uint32_t(1), table.getTableCount());
+    ASSERT_EQ(uint32_t(1), table.getBasePackageCount());
+    ASSERT_EQ(expectedCookie, table.getTableCookie(0));
+
+    const DynamicRefTable* dynamicRefTable = table.getDynamicRefTableForCookie(expectedCookie);
+    ASSERT_TRUE(dynamicRefTable != NULL);
+
+    Res_value val;
+    ASSERT_LT(table.getResource(base::R::integer::number1, &val, MAY_NOT_BE_BAG), 0);
+}
+
 }