Let getOriginalMimeType() take a fd passed from drm java applications

At present, we did not actually pass the fd. This patch allows us to
make the changes necessary in the future without worrying too much
about broken build.

related-to-bug: 6426185

Change-Id: I125decff9be621a72f2631fd439994a94a526606

drm/java/android/drm/DrmManagerClient.java

@@ -29,6 +29,9 @@ import android.os.Message;
 import android.provider.MediaStore;
 import android.util.Log;
 
+import java.io.File;
+import java.io.FileDescriptor;
+import java.io.FileInputStream;
 import java.io.IOException;
 import java.lang.ref.WeakReference;
 import java.util.ArrayList;
@@ -582,7 +585,28 @@ public class DrmManagerClient {
         if (null == path || path.equals("")) {
             throw new IllegalArgumentException("Given path should be non null");
         }
-        return _getOriginalMimeType(mUniqueId, path);
+
+        String mime = null;
+
+        FileInputStream is = null;
+        try {
+            FileDescriptor fd = null;
+            File file = new File(path);
+            if (file.exists()) {
+                is = new FileInputStream(file);
+                fd = is.getFD();
+            }
+            mime = _getOriginalMimeType(mUniqueId, path, fd);
+        } catch (IOException ioe) {
+        } finally {
+            if (is != null) {
+                try {
+                    is.close();
+                } catch(IOException e) {}
+            }
+        }
+
+        return mime;
     }
 
     /**
@@ -848,7 +872,7 @@ public class DrmManagerClient {
 
     private native int _getDrmObjectType(int uniqueId, String path, String mimeType);
 
-    private native String _getOriginalMimeType(int uniqueId, String path);
+    private native String _getOriginalMimeType(int uniqueId, String path, FileDescriptor fd);
 
     private native int _checkRightsStatus(int uniqueId, String path, int action);
 

drm/jni/android_drm_DrmManagerClient.cpp

@@ -578,22 +578,28 @@ static jint android_drm_DrmManagerClient_getDrmObjectType(
 }
 
 static jstring android_drm_DrmManagerClient_getOriginalMimeType(
-            JNIEnv* env, jobject thiz, jint uniqueId, jstring path) {
+            JNIEnv* env, jobject thiz, jint uniqueId, jstring path, jobject fileDescriptor) {
     ALOGV("getOriginalMimeType Enter");
+
+    int fd = (fileDescriptor == NULL)
+                ? -1
+                : jniGetFDFromFileDescriptor(env, fileDescriptor);
+
     String8 mimeType
         = getDrmManagerClientImpl(env, thiz)
-            ->getOriginalMimeType(uniqueId, Utility::getStringValue(env, path));
+            ->getOriginalMimeType(uniqueId,
+                                  Utility::getStringValue(env, path), fd);
     ALOGV("getOriginalMimeType Exit");
     return env->NewStringUTF(mimeType.string());
 }
 
 static jint android_drm_DrmManagerClient_checkRightsStatus(
             JNIEnv* env, jobject thiz, jint uniqueId, jstring path, int action) {
-    ALOGV("getOriginalMimeType Enter");
+    ALOGV("checkRightsStatus Enter");
     int rightsStatus
         = getDrmManagerClientImpl(env, thiz)
             ->checkRightsStatus(uniqueId, Utility::getStringValue(env, path), action);
-    ALOGV("getOriginalMimeType Exit");
+    ALOGV("checkRightsStatus Exit");
     return rightsStatus;
 }
 
@@ -721,7 +727,7 @@ static JNINativeMethod nativeMethods[] = {
     {"_getDrmObjectType", "(ILjava/lang/String;Ljava/lang/String;)I",
                                     (void*)android_drm_DrmManagerClient_getDrmObjectType},
 
-    {"_getOriginalMimeType", "(ILjava/lang/String;)Ljava/lang/String;",
+    {"_getOriginalMimeType", "(ILjava/lang/String;Ljava/io/FileDescriptor;)Ljava/lang/String;",
                                     (void*)android_drm_DrmManagerClient_getOriginalMimeType},
 
     {"_checkRightsStatus", "(ILjava/lang/String;I)I",