diff --git a/drm/common/ReadWriteUtils.cpp b/drm/common/ReadWriteUtils.cpp
new file mode 100644
index 0000000..4319c1c
--- /dev/null
+++ b/drm/common/ReadWriteUtils.cpp
@@ -0,0 +1,100 @@
+/*
+ * Copyright (C) 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.
+ */
+
+#include <ReadWriteUtils.h>
+#include <sys/mman.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <utils/FileMap.h>
+#include <utils/String8.h>
+
+using namespace android;
+
+#define FAILURE -1
+
+String8 ReadWriteUtils::readBytes(const String8& filePath) {
+    FILE* file = NULL;
+    file = fopen(filePath.string(), "r");
+
+    String8 string("");
+    if (NULL != file) {
+        int fd = fileno(file);
+        struct stat sb;
+
+        if (fstat(fd, &sb) == 0 && sb.st_size > 0) {
+            FileMap* fileMap = new FileMap();
+            if (fileMap->create(filePath.string(), fd, 0, sb.st_size, true)) {
+                char* addr = (char*)fileMap->getDataPtr();
+                string.append(addr, sb.st_size);
+                fileMap->release();
+            }
+        }
+        fclose(file);
+    }
+    return string;
+}
+
+void ReadWriteUtils::writeToFile(const String8& filePath, const String8& data) {
+    FILE* file = NULL;
+    file = fopen(filePath.string(), "w+");
+
+    if (NULL != file) {
+        int fd = fileno(file);
+
+        int size = data.size();
+        if (FAILURE != ftruncate(fd, size)) {
+            FileMap* fileMap = NULL;
+            fileMap = new FileMap();
+            if (fileMap->create(filePath.string(), fd, 0, size, false)) {
+                char* addr = (char*)fileMap->getDataPtr();
+                memcpy(addr, data.string(), size);
+                fileMap->release();
+            }
+        }
+        fclose(file);
+    }
+}
+
+void ReadWriteUtils::appendToFile(const String8& filePath, const String8& data) {
+    FILE* file = NULL;
+    file = fopen(filePath.string(), "a+");
+
+    if (NULL != file) {
+        int fd = fileno(file);
+
+        int offset = lseek(fd, 0, SEEK_END);
+        if (FAILURE != offset) {
+            int newEntrySize = data.size();
+            int fileSize = offset + newEntrySize;
+
+            if (FAILURE != ftruncate(fd, fileSize)) {
+                FileMap* fileMap = NULL;
+                fileMap = new FileMap();
+                if (fileMap->create(filePath.string(), fd, offset, fileSize, false)) {
+                    char* addr = (char*)fileMap->getDataPtr();
+                    memcpy(addr, data.string(), data.size());
+                    fileMap->release();
+                }
+            }
+        }
+        fclose(file);
+    }
+}
+