AAPT2: Split APK by ABI.

Added a FilterChain that can apply multiple filter steps to an APK file
as it is being written to disk. The first filter applied is by ABI. If
a library in the APK does not match the filter it is skipped.

Added an AbiFilter that keeps files that are either not native libs or
are for the set of wanted ABIs

Test: ran unit tests locally
Test: ran against an APK with ARM and x68 libs and diffed the results

Change-Id: I3fb901d3de3513e85f2a2763a8e4487a28ed4881

1 files changed, 13 insertions, 0 deletions

diff --git a/tools/aapt2/LoadedApk.cpp b/tools/aapt2/LoadedApk.cpp
index 8a8f8be205e7..7e5efa15f61b 100644
--- a/tools/aapt2/LoadedApk.cpp
+++ b/tools/aapt2/LoadedApk.cpp
@@ -57,6 +57,12 @@ std::unique_ptr<LoadedApk> LoadedApk::LoadApkFromPath(IAaptContext* context,
 
 bool LoadedApk::WriteToArchive(IAaptContext* context, const TableFlattenerOptions& options,
                                IArchiveWriter* writer) {
+  FilterChain empty;
+  return WriteToArchive(context, options, &empty, writer);
+}
+
+bool LoadedApk::WriteToArchive(IAaptContext* context, const TableFlattenerOptions& options,
+                               FilterChain* filters, IArchiveWriter* writer) {
   std::set<std::string> referenced_resources;
   // List the files being referenced in the resource table.
   for (auto& pkg : table_->packages) {
@@ -89,6 +95,13 @@ bool LoadedApk::WriteToArchive(IAaptContext* context, const TableFlattenerOption
       continue;
     }
 
+    if (!filters->Keep(path)) {
+      if (context->IsVerbose()) {
+        context->GetDiagnostics()->Note(DiagMessage() << "Filtered '" << path << "' from APK.");
+      }
+      continue;
+    }
+
     // The resource table needs to be re-serialized since it might have changed.
     if (path == "resources.arsc") {
       BigBuffer buffer(4096);