Add API to call to vold for mounting OBBs

* Unhide StorageService class; hide all the USB-related items

* Add application-visible API to StorageManager for OBB files

* Add class for parceling OBB info across binders (ObbInfo)

* Add a JNI glue class to libutils/ObbFile (ObbScanner)

* Add API to MountService to deal with calling into vold and checking
  permissions

Change-Id: I33ecf9606b8ff535f3a2ada83931da6bbef41cfd

1 files changed, 94 insertions, 0 deletions

diff --git a/core/jni/android_content_res_ObbScanner.cpp b/core/jni/android_content_res_ObbScanner.cpp
new file mode 100644
index 0000000..1239274
--- /dev/null
+++ b/core/jni/android_content_res_ObbScanner.cpp
@@ -0,0 +1,94 @@
+/*
+ * Copyright 2010, The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#define LOG_TAG "ObbScanner"
+
+#include <utils/Log.h>
+#include <utils/String8.h>
+#include <utils/ObbFile.h>
+
+#include "jni.h"
+#include "utils/misc.h"
+#include "android_runtime/AndroidRuntime.h"
+
+namespace android {
+
+static struct {
+    jclass clazz;
+
+    jfieldID packageName;
+    jfieldID version;
+} gObbInfoClassInfo;
+
+static jboolean android_content_res_ObbScanner_getObbInfo(JNIEnv* env, jobject clazz, jstring file,
+        jobject obbInfo)
+{
+    const char* filePath = env->GetStringUTFChars(file, JNI_FALSE);
+
+    sp<ObbFile> obb = new ObbFile();
+    if (!obb->readFrom(filePath)) {
+        env->ReleaseStringUTFChars(file, filePath);
+        return JNI_FALSE;
+    }
+
+    env->ReleaseStringUTFChars(file, filePath);
+
+    const char* packageNameStr = obb->getPackageName().string();
+
+    jstring packageName = env->NewStringUTF(packageNameStr);
+    if (packageName == NULL) {
+        return JNI_FALSE;
+    }
+
+    env->SetObjectField(obbInfo, gObbInfoClassInfo.packageName, packageName);
+    env->SetIntField(obbInfo, gObbInfoClassInfo.version, obb->getVersion());
+
+    return JNI_TRUE;
+}
+
+/*
+ * JNI registration.
+ */
+static JNINativeMethod gMethods[] = {
+    /* name, signature, funcPtr */
+    { "getObbInfo_native", "(Ljava/lang/String;Landroid/content/res/ObbInfo;)Z",
+            (void*) android_content_res_ObbScanner_getObbInfo },
+};
+
+#define FIND_CLASS(var, className) \
+        var = env->FindClass(className); \
+        LOG_FATAL_IF(! var, "Unable to find class " className); \
+        var = jclass(env->NewGlobalRef(var));
+
+#define GET_FIELD_ID(var, clazz, fieldName, fieldDescriptor) \
+        var = env->GetFieldID(clazz, fieldName, fieldDescriptor); \
+        LOG_FATAL_IF(! var, "Unable to find field " fieldName);
+
+int register_android_content_res_ObbScanner(JNIEnv* env)
+{
+    FIND_CLASS(gObbInfoClassInfo.clazz, "android/content/res/ObbInfo");
+
+    GET_FIELD_ID(gObbInfoClassInfo.packageName, gObbInfoClassInfo.clazz,
+            "packageName", "Ljava/lang/String;");
+    GET_FIELD_ID(gObbInfoClassInfo.version, gObbInfoClassInfo.clazz,
+            "version", "I");
+
+    return AndroidRuntime::registerNativeMethods(env, "android/content/res/ObbScanner", gMethods,
+            NELEM(gMethods));
+}
+
+}; // namespace android
+