Add eh gallery spider

app/src/main/java/com/hippo/io/UniFileInputStreamPipe.java

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+/*
+ * Copyright 2015 Hippo Seven
+ *
+ * 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.hippo.io;
+
+import android.support.annotation.NonNull;
+
+import com.hippo.unifile.UniFile;
+import com.hippo.yorozuya.IOUtils;
+import com.hippo.yorozuya.io.InputStreamPipe;
+
+import java.io.IOException;
+import java.io.InputStream;
+
+public class UniFileInputStreamPipe implements InputStreamPipe {
+
+    private UniFile mFile;
+    private InputStream mIs;
+
+    public UniFileInputStreamPipe(UniFile file) {
+        mFile = file;
+    }
+
+    @Override
+    public void obtain() {
+        // Empty
+    }
+
+    @Override
+    public void release() {
+        // Empty
+    }
+
+    @NonNull
+    @Override
+    public InputStream open() throws IOException {
+        if (mIs != null) {
+            throw new IllegalStateException("Please close it first");
+        }
+
+        mIs = mFile.openInputStream();
+        return mIs;
+    }
+
+    @Override
+    public void close() {
+        IOUtils.closeQuietly(mIs);
+        mIs = null;
+    }
+}