From e686a42b89aaa6e4286833a361066e7d372522ce Mon Sep 17 00:00:00 2001
From: Hung-ying Tyan <tyanh@google.com>
Date: Fri, 19 Oct 2012 20:50:50 +0800
Subject: Move new exif lib to gallerycommon.

https://googleplex-android-review.googlesource.com/#/c/242047 depends on this.

Bug: 6667860
Change-Id: Iac937e2eea94f0f5ffde876235b1c2ee748e7570
---
 .../src/com/android/gallery3d/exif/ExifReader.java | 74 ++++++++++++++++++++++
 1 file changed, 74 insertions(+)
 create mode 100644 gallerycommon/src/com/android/gallery3d/exif/ExifReader.java

(limited to 'gallerycommon/src/com/android/gallery3d/exif/ExifReader.java')

diff --git a/gallerycommon/src/com/android/gallery3d/exif/ExifReader.java b/gallerycommon/src/com/android/gallery3d/exif/ExifReader.java
new file mode 100644
index 000000000..d8083b2dd
--- /dev/null
+++ b/gallerycommon/src/com/android/gallery3d/exif/ExifReader.java
@@ -0,0 +1,74 @@
+/*
+ * Copyright (C) 2012 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.exif;
+
+import java.io.IOException;
+import java.io.InputStream;
+
+/**
+ * This class reads the EXIF header of a JPEG file and stores it in {@link ExifData}.
+ */
+public class ExifReader {
+    /**
+     * Parses the inputStream and  and returns the EXIF data in an {@link ExifData}.
+     * @throws ExifInvalidFormatException
+     * @throws IOException
+     */
+    public ExifData read(InputStream inputStream) throws ExifInvalidFormatException,
+            IOException {
+        ExifParser parser = ExifParser.parse(inputStream);
+        ExifData exifData = new ExifData(parser.getByteOrder());
+
+        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:
+                    ExifTag 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) {
+                        byte[] buf = new byte[tag.getComponentCount()];
+                        parser.read(buf);
+                        tag.setValue(buf);
+                    }
+                    exifData.getIfdData(tag.getIfd()).setTag(tag);
+                    break;
+                case ExifParser.EVENT_COMPRESSED_IMAGE:
+                    byte buf[] = new byte[parser.getCompressedImageSize()];
+                    parser.read(buf);
+                    exifData.setCompressedThumbnail(buf);
+                    break;
+                case ExifParser.EVENT_UNCOMPRESSED_STRIP:
+                    buf = new byte[parser.getStripSize()];
+                    parser.read(buf);
+                    exifData.setStripBytes(parser.getStripIndex(), buf);
+                    break;
+            }
+            event = parser.next();
+        }
+        return exifData;
+    }
+}
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