Add utility methods for reading and writing text (mostly sysfs) files.

2 files changed, 76 insertions, 1 deletions

diff --git a/src/org/cyanogenmod/hardware/DisplayColorCalibration.java b/src/org/cyanogenmod/hardware/DisplayColorCalibration.java
index e0d05fa..3a6f39b 100644
--- a/src/org/cyanogenmod/hardware/DisplayColorCalibration.java
+++ b/src/org/cyanogenmod/hardware/DisplayColorCalibration.java
@@ -75,5 +75,4 @@ public class DisplayColorCalibration {
     public static String getCurColors() {
         return "0 0 0";
     }
-
 }
diff --git a/src/org/cyanogenmod/hardware/util/FileUtils.java b/src/org/cyanogenmod/hardware/util/FileUtils.java
new file mode 100644
index 0000000..9d3ee01
--- /dev/null
+++ b/src/org/cyanogenmod/hardware/util/FileUtils.java
@@ -0,0 +1,76 @@
+/*
+ * Copyright (C) 2013 The CyanogenMod 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.
+ */
+
+package org.cyanogenmod.hardware.util;
+
+import android.util.Log;
+
+import java.io.BufferedReader;
+import java.io.FileOutputStream;
+import java.io.FileReader;
+import java.io.IOException;
+
+public final class FileUtils {
+    private static final String TAG = "FileUtils";
+
+    private FileUtils() {
+        // this class is not supposed to be instantiated
+    }
+
+    /**
+     * Reads the first line of text from the given file
+     */
+    public static String readOneLine(String fileName) {
+        String line = null;
+        BufferedReader reader = null;
+
+        try {
+            reader = new BufferedReader(new FileReader(fileName), 512);
+            line = reader.readLine();
+        } catch (IOException e) {
+            Log.e(TAG, "Could not read from file " + fileName, e);
+        } finally {
+            try {
+                if (reader != null) {
+                    reader.close();
+                }
+            } catch (IOException e) {
+                // ignored, not much we can do anyway
+            }
+        }
+
+        return line;
+    }
+
+    /**
+     * Writes the given value into the given file
+     *
+     * @return true on success, false on failure
+     */
+    public static boolean writeLine(String fileName, String value) {
+        try {
+            FileOutputStream fos = new FileOutputStream(fileName);
+            fos.write(value.getBytes());
+            fos.flush();
+            fos.close();
+        } catch (IOException e) {
+            Log.e(TAG, "Could not write to file " + fileName, e);
+            return false;
+        }
+
+        return true;
+    }
+}