1 files changed, 152 insertions, 0 deletions
diff --git a/WallpaperPicker/src/com/android/gallery3d/exif/IfdData.java b/WallpaperPicker/src/com/android/gallery3d/exif/IfdData.java
new file mode 100644
index 000000000..093944aec
--- /dev/null
+++ b/WallpaperPicker/src/com/android/gallery3d/exif/IfdData.java
@@ -0,0 +1,152 @@
+/*
+ * 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;
+    private static final int[] sIfds = {
+            IfdId.TYPE_IFD_0, IfdId.TYPE_IFD_1, IfdId.TYPE_IFD_EXIF,
+            IfdId.TYPE_IFD_INTEROPERABILITY, IfdId.TYPE_IFD_GPS
+    };
+    /**
+     * 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
+     */
+    IfdData(int ifdId) {
+        mIfdId = ifdId;
+    }
+
+    static protected int[] getIfds() {
+        return sIfds;
+    }
+
+    /**
+     * Get a array the contains all {@link ExifTag} in this IFD.
+     */
+    protected 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
+     */
+    protected int getId() {
+        return mIfdId;
+    }
+
+    /**
+     * Gets the {@link ExifTag} with given tag id. Return null if there is no
+     * such tag.
+     */
+    protected ExifTag getTag(short tagId) {
+        return mExifTags.get(tagId);
+    }
+
+    /**
+     * Adds or replaces a {@link ExifTag}.
+     */
+    protected ExifTag setTag(ExifTag tag) {
+        tag.setIfd(mIfdId);
+        return mExifTags.put(tag.getTagId(), tag);
+    }
+
+    protected boolean checkCollision(short tagId) {
+        return mExifTags.get(tagId) != null;
+    }
+
+    /**
+     * Removes the tag of the given ID
+     */
+    protected void removeTag(short tagId) {
+        mExifTags.remove(tagId);
+    }
+
+    /**
+     * Gets the tags count in the IFD.
+     */
+    protected int getTagCount() {
+        return mExifTags.size();
+    }
+
+    /**
+     * Sets the offset of next IFD.
+     */
+    protected void setOffsetToNextIfd(int offset) {
+        mOffsetToNextIfd = offset;
+    }
+
+    /**
+     * Gets the offset of next IFD.
+     */
+    protected 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 (this == obj) {
+            return true;
+        }
+        if (obj == null) {
+            return false;
+        }
+        if (obj instanceof IfdData) {
+            IfdData data = (IfdData) obj;
+            if (data.getId() == mIfdId && data.getTagCount() == getTagCount()) {
+                ExifTag[] tags = data.getAllTags();
+                for (ExifTag tag : tags) {
+                    if (ExifInterface.isOffsetTag(tag.getTagId())) {
+                        continue;
+                    }
+                    ExifTag tag2 = mExifTags.get(tag.getTagId());
+                    if (!tag.equals(tag2)) {
+                        return false;
+                    }
+                }
+                return true;
+            }
+        }
+        return false;
+    }
+}