[res] Better modification time resolution in Idmap

We used to track the modification time in seconds, which is both
imprecise (an apk installation + idmap generation can easily
take less time) and forces us to wait for >1s in the tests to
just check if up-to-date checks work.

This change updates the time to nanosecond resolution where
supported (hm, MinGW for Windows, hm), as the underlying
OS API provides

Test: build + atest libandroidfw_tests idmap2_tests + boot
Flag: EXEMPT minor change
Change-Id: I37635e6f3b62aff3b4794912ac585a9ef5ea7a1e

1 files changed, 17 insertions, 15 deletions

diff --git a/libs/androidfw/AssetManager.cpp b/libs/androidfw/AssetManager.cpp
index e6182454ad8a..5955915c9fcd 100644
--- a/libs/androidfw/AssetManager.cpp
+++ b/libs/androidfw/AssetManager.cpp
@@ -1420,18 +1420,20 @@ void AssetManager::mergeInfoLocked(SortedVector<AssetDir::FileInfo>* pMergedInfo
 Mutex AssetManager::SharedZip::gLock;
 DefaultKeyedVector<String8, wp<AssetManager::SharedZip> > AssetManager::SharedZip::gOpen;
 
-AssetManager::SharedZip::SharedZip(const String8& path, time_t modWhen)
-    : mPath(path), mZipFile(NULL), mModWhen(modWhen),
-      mResourceTableAsset(NULL), mResourceTable(NULL)
-{
-    if (kIsDebug) {
-        ALOGI("Creating SharedZip %p %s\n", this, mPath.c_str());
-    }
-    ALOGV("+++ opening zip '%s'\n", mPath.c_str());
-    mZipFile = ZipFileRO::open(mPath.c_str());
-    if (mZipFile == NULL) {
-        ALOGD("failed to open Zip archive '%s'\n", mPath.c_str());
-    }
+AssetManager::SharedZip::SharedZip(const String8& path, ModDate modWhen)
+    : mPath(path),
+      mZipFile(NULL),
+      mModWhen(modWhen),
+      mResourceTableAsset(NULL),
+      mResourceTable(NULL) {
+  if (kIsDebug) {
+    ALOGI("Creating SharedZip %p %s\n", this, mPath.c_str());
+  }
+  ALOGV("+++ opening zip '%s'\n", mPath.c_str());
+  mZipFile = ZipFileRO::open(mPath.c_str());
+  if (mZipFile == NULL) {
+    ALOGD("failed to open Zip archive '%s'\n", mPath.c_str());
+  }
 }
 
 AssetManager::SharedZip::SharedZip(int fd, const String8& path)
@@ -1453,7 +1455,7 @@ sp<AssetManager::SharedZip> AssetManager::SharedZip::get(const String8& path,
         bool createIfNotPresent)
 {
     AutoMutex _l(gLock);
-    time_t modWhen = getFileModDate(path.c_str());
+    auto modWhen = getFileModDate(path.c_str());
     sp<SharedZip> zip = gOpen.valueFor(path).promote();
     if (zip != NULL && zip->mModWhen == modWhen) {
         return zip;
@@ -1520,8 +1522,8 @@ ResTable* AssetManager::SharedZip::setResourceTable(ResTable* res)
 
 bool AssetManager::SharedZip::isUpToDate()
 {
-    time_t modWhen = getFileModDate(mPath.c_str());
-    return mModWhen == modWhen;
+  auto modWhen = getFileModDate(mPath.c_str());
+  return mModWhen == modWhen;
 }
 
 void AssetManager::SharedZip::addOverlay(const asset_path& ap)