From 2c6c9f9d75d03174b446ff218ac66cf81bba5109 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/IfdData.java    | 122 +++++++++++++++++++++
 1 file changed, 122 insertions(+)
 create mode 100644 gallerycommon/src/com/android/gallery3d/exif/IfdData.java

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

diff --git a/gallerycommon/src/com/android/gallery3d/exif/IfdData.java b/gallerycommon/src/com/android/gallery3d/exif/IfdData.java
new file mode 100644
index 000000000..78f9173cc
--- /dev/null
+++ b/gallerycommon/src/com/android/gallery3d/exif/IfdData.java
@@ -0,0 +1,122 @@
+/*
+ * 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.util.HashMap;
+import java.util.Map;
+
+/**
+ * This class stores all the tags in an IFD.
+ *
+ * @see ExifData
+ * @see ExifTag
+ */
+class IfdData {
+
+    private final int mIfdId;
+    private final Map<Short, ExifTag> mExifTags = new HashMap<Short, ExifTag>();
+    private int mOffsetToNextIfd = 0;
+
+    /**
+     * Creates an IfdData with given IFD ID.
+     *
+     * @see IfdId#TYPE_IFD_0
+     * @see IfdId#TYPE_IFD_1
+     * @see IfdId#TYPE_IFD_EXIF
+     * @see IfdId#TYPE_IFD_GPS
+     * @see IfdId#TYPE_IFD_INTEROPERABILITY
+     */
+    public IfdData(int ifdId) {
+        mIfdId = ifdId;
+    }
+
+    /**
+     * Get a array the contains all {@link ExifTag} in this IFD.
+     */
+    public ExifTag[] getAllTags() {
+        return mExifTags.values().toArray(new ExifTag[mExifTags.size()]);
+    }
+
+    /**
+     * Gets the ID of this IFD.
+     *
+     * @see IfdId#TYPE_IFD_0
+     * @see IfdId#TYPE_IFD_1
+     * @see IfdId#TYPE_IFD_EXIF
+     * @see IfdId#TYPE_IFD_GPS
+     * @see IfdId#TYPE_IFD_INTEROPERABILITY
+     */
+    public int getId() {
+        return mIfdId;
+    }
+
+    /**
+     * Gets the {@link ExifTag} with given tag id. Return null if there is no such tag.
+     */
+    public ExifTag getTag(short tagId) {
+        return mExifTags.get(tagId);
+    }
+
+    /**
+     * Adds or replaces a {@link ExifTag}.
+     */
+    public void setTag(ExifTag tag) {
+        mExifTags.put(tag.getTagId(), tag);
+    }
+
+    /**
+     * Gets the tags count in the IFD.
+     */
+    public int getTagCount() {
+        return mExifTags.size();
+    }
+
+    /**
+     * Sets the offset of next IFD.
+     */
+    void setOffsetToNextIfd(int offset) {
+        mOffsetToNextIfd = offset;
+    }
+
+    /**
+     * Gets the offset of next IFD.
+     */
+    int getOffsetToNextIfd() {
+        return mOffsetToNextIfd;
+    }
+
+    /**
+     * Returns true if all tags in this two IFDs are equal. Note that tags of IFDs offset or
+     * thumbnail offset will be ignored.
+     */
+    @Override
+    public boolean equals(Object obj) {
+        if (obj instanceof IfdData) {
+            IfdData data = (IfdData) obj;
+            if (data.getId() == mIfdId && data.getTagCount() == getTagCount()) {
+                ExifTag[] tags = data.getAllTags();
+                for (ExifTag tag: tags) {
+                    if (ExifTag.isOffsetTag(tag.getTagId())) continue;
+                    ExifTag tag2 = mExifTags.get(tag.getTagId());
+                    if (!tag.equals(tag2)) return false;
+                }
+                return true;
+            }
+        }
+        return false;
+    }
+}
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