New command line tool 'idmap'

Introduce a new tool 'idmap' to handle generation and verification of
idmap files. The tool is modelled on 'dexopt', and is intended to be
used similarly, notably by 'installd'.
See cmds/idmap/idmap.cpp for further documentation on 'idmap'.

Note: this commit is interdependent on a commit in project build/ to add
'idmap' to PRODUCT_PACKAGES.

Note: the changes to androidfw are only stubs. The actual implementation
will be provided in Runtime resource overlay, iteration 2.

Change-Id: I7131b74ece1e46c8a9c0a31d103e686aa07da2bb

1 files changed, 25 insertions, 0 deletions

diff --git a/libs/androidfw/AssetManager.cpp b/libs/androidfw/AssetManager.cpp
index 08328d06ac7d..251d47b0ce8d 100644
--- a/libs/androidfw/AssetManager.cpp
+++ b/libs/androidfw/AssetManager.cpp
@@ -83,6 +83,8 @@ static Asset* const kExcludedAsset = (Asset*) 0xd000000d;
 
 static volatile int32_t gCount = 0;
 
+const char* AssetManager::RESOURCES_FILENAME = "resources.arsc";
+
 namespace {
     // Transform string /a/b/c.apk to /data/resource-cache/a@b@c.apk@idmap
     String8 idmapPathForPackagePath(const String8& pkgPath)
@@ -239,6 +241,29 @@ bool AssetManager::addAssetPath(const String8& path, int32_t* cookie)
     return true;
 }
 
+bool AssetManager::createIdmap(const char* targetApkPath, const char* overlayApkPath,
+        uint32_t targetCrc, uint32_t overlayCrc, uint32_t** outData, uint32_t* outSize)
+{
+    AutoMutex _l(mLock);
+    const String8 paths[2] = { String8(targetApkPath), String8(overlayApkPath) };
+    ResTable tables[2];
+
+    for (int i = 0; i < 2; ++i) {
+        asset_path ap;
+        ap.type = kFileTypeRegular;
+        ap.path = paths[i];
+        Asset* ass = openNonAssetInPathLocked("resources.arsc", Asset::ACCESS_BUFFER, ap);
+        if (ass == NULL) {
+            ALOGW("failed to find resources.arsc in %s\n", ap.path.string());
+            return false;
+        }
+        tables[i].add(ass, (void*)1, false);
+    }
+
+    return tables[0].createIdmap(tables[1], targetCrc, overlayCrc,
+            targetApkPath, overlayApkPath, (void**)outData, outSize) == NO_ERROR;
+}
+
 bool AssetManager::isIdmapStaleLocked(const String8& originalPath, const String8& overlayPath,
                                       const String8& idmapPath)
 {