1 files changed, 145 insertions, 0 deletions
diff --git a/WallpaperPicker/src/com/android/gallery3d/common/ExifOrientation.java b/WallpaperPicker/src/com/android/gallery3d/common/ExifOrientation.java
new file mode 100644
index 000000000..ad4370c37
--- /dev/null
+++ b/WallpaperPicker/src/com/android/gallery3d/common/ExifOrientation.java
@@ -0,0 +1,145 @@
+/**
+ * Copyright (C) 2015 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.
+ */
+package com.android.gallery3d.common;
+
+import android.content.Context;
+import android.media.ExifInterface;
+import android.util.Log;
+
+import java.io.DataInputStream;
+import java.io.DataOutputStream;
+import java.io.File;
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.io.InputStream;
+
+public class ExifOrientation {
+    private static final String TAG = "ExifOrientation";
+    private static final boolean DEBUG = false;
+
+    private static final short SOI =  (short) 0xFFD8;   // start of input
+    private static final short APP0 = (short) 0xFFE0;
+    private static final short APPF = (short) 0xFFEF;
+    private static final short APP1 = (short) 0xFFE1;
+    private static final short SOS = (short) 0xFFDA;    // start of stream
+    private static final short EOI = (short) 0xFFD9;    // end of input
+
+    // The header is available in first 64 bytes, so reading upto 128 bytes
+    // should be more than enough.
+    private static final int MAX_BYTES_TO_READ = 128 * 1024;
+
+    /**
+     * Parses the rotation of the JPEG image from the input stream.
+     */
+    public static final int readRotation(InputStream in, Context context) {
+        // Since the platform implementation only takes file input, create a temporary file
+        // with just the image header.
+        File tempFile = null;
+        DataOutputStream tempOut = null;
+
+        try {
+        DataInputStream din = new DataInputStream(in);
+            int pos = 0;
+            if (din.readShort() == SOI) {
+                pos += 2;
+
+                short marker = din.readShort();
+                pos += 2;
+
+                while ((marker >= APP0 && marker <= APPF) && pos < MAX_BYTES_TO_READ) {
+                    int length = din.readUnsignedShort();
+                    if (length < 2) {
+                        throw new IOException("Invalid header size");
+                    }
+
+                    // We only want APP1 headers
+                    if (length > 2) {
+                        if (marker == APP1) {
+                            // Copy the header
+                            if (tempFile == null) {
+                                tempFile = File.createTempFile(TAG, ".jpg", context.getCacheDir());
+                                tempOut = new DataOutputStream(new FileOutputStream(tempFile));
+                                tempOut.writeShort(SOI);
+                            }
+
+                            tempOut.writeShort(marker);
+                            tempOut.writeShort(length);
+
+                            byte[] header = new byte[length - 2];
+                            din.read(header);
+                            tempOut.write(header);
+                        } else {
+                            din.skip(length - 2);
+                        }
+                    }
+                    pos += length;
+
+                    marker = din.readShort();
+                    pos += 2;
+                }
+
+                if (tempOut != null) {
+                    // Write empty image data.
+                    tempOut.writeShort(SOS);
+                    // Write the frame size as 2. Since this includes the size bytes as well
+                    // (short = 2 bytes), it implies there is 0 byte of image data.
+                    tempOut.writeShort(2);
+
+                    // End of input
+                    tempOut.writeShort(EOI);
+                    tempOut.close();
+
+                    return readRotation(tempFile.getAbsolutePath());
+                }
+            }
+        } catch (IOException e) {
+            if (DEBUG) {
+                Log.d(TAG, "Error parsing input stream", e);
+            }
+        } finally {
+            Utils.closeSilently(in);
+            Utils.closeSilently(tempOut);
+            if (tempFile != null) {
+                tempFile.delete();
+            }
+        }
+        return 0;
+    }
+
+    /**
+     * Parses the rotation of the JPEG image.
+     */
+    public static final int readRotation(String filePath) {
+        try {
+            ExifInterface exif = new ExifInterface(filePath);
+            switch (exif.getAttributeInt(ExifInterface.TAG_ORIENTATION, 0)) {
+                case ExifInterface.ORIENTATION_ROTATE_90:
+                    return 90;
+                case ExifInterface.ORIENTATION_ROTATE_270:
+                    return 270;
+                case ExifInterface.ORIENTATION_ROTATE_180:
+                    return 180;
+                default:
+                    return 0;
+            }
+        } catch (IOException e) {
+            if (DEBUG) {
+                Log.d(TAG, "Error reading file", e);
+            }
+        }
+        return 0;
+    }
+}