Add native libraries

native/src/main/java/com/hippo/a7zip/SeekableInputStream.java

@@ -0,0 +1,40 @@
+/*
+ * Copyright 2020 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.a7zip;
+
+import java.io.IOException;
+import java.io.InputStream;
+
+public abstract class SeekableInputStream extends InputStream {
+
+    /**
+     * Sets the position, measured from the beginning,
+     * at which the next read occurs. The offset may be
+     * set beyond the end of the file.
+     */
+    public abstract void seek(long pos) throws IOException;
+
+    /**
+     * Returns current position, measured from the beginning.
+     */
+    public abstract long tell() throws IOException;
+
+    /**
+     * Returns the size.
+     */
+    public abstract long size() throws IOException;
+}