1 files changed, 81 insertions, 0 deletions
diff --git a/java/com/android/dialer/callcomposer/camera/exif/ExifReader.java b/java/com/android/dialer/callcomposer/camera/exif/ExifReader.java
new file mode 100644
index 000000000..89d212661
--- /dev/null
+++ b/java/com/android/dialer/callcomposer/camera/exif/ExifReader.java
@@ -0,0 +1,81 @@
+/*
+ * Copyright (C) 2016 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.dialer.callcomposer.camera.exif;
+
+import com.android.dialer.common.LogUtil;
+import java.io.IOException;
+import java.io.InputStream;
+
+/** This class reads the EXIF header of a JPEG file and stores it in {@link ExifData}. */
+class ExifReader {
+
+  private final ExifInterface mInterface;
+
+  ExifReader(ExifInterface iRef) {
+    mInterface = iRef;
+  }
+
+  /**
+   * Parses the inputStream and and returns the EXIF data in an {@link ExifData}.
+   *
+   * @throws ExifInvalidFormatException
+   * @throws java.io.IOException
+   */
+  protected ExifData read(InputStream inputStream) throws ExifInvalidFormatException, IOException {
+    ExifParser parser = ExifParser.parse(inputStream, mInterface);
+    ExifData exifData = new ExifData();
+    ExifTag tag;
+
+    int event = parser.next();
+    while (event != ExifParser.EVENT_END) {
+      switch (event) {
+        case ExifParser.EVENT_START_OF_IFD:
+          exifData.addIfdData(new IfdData(parser.getCurrentIfd()));
+          break;
+        case ExifParser.EVENT_NEW_TAG:
+          tag = parser.getTag();
+          if (!tag.hasValue()) {
+            parser.registerForTagValue(tag);
+          } else {
+            exifData.getIfdData(tag.getIfd()).setTag(tag);
+          }
+          break;
+        case ExifParser.EVENT_VALUE_OF_REGISTERED_TAG:
+          tag = parser.getTag();
+          if (tag.getDataType() == ExifTag.TYPE_UNDEFINED) {
+            parser.readFullTagValue(tag);
+          }
+          exifData.getIfdData(tag.getIfd()).setTag(tag);
+          break;
+        case ExifParser.EVENT_COMPRESSED_IMAGE:
+          byte[] buf = new byte[parser.getCompressedImageSize()];
+          if (buf.length != parser.read(buf)) {
+            LogUtil.i("ExifReader.read", "Failed to read the compressed thumbnail");
+          }
+          break;
+        case ExifParser.EVENT_UNCOMPRESSED_STRIP:
+          buf = new byte[parser.getStripSize()];
+          if (buf.length != parser.read(buf)) {
+            LogUtil.i("ExifReader.read", "Failed to read the strip bytes");
+          }
+          break;
+      }
+      event = parser.next();
+    }
+    return exifData;
+  }
+}