Add native libraries

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

@@ -0,0 +1,81 @@
+/*
+ * 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 androidx.annotation.NonNull;
+
+import java.io.File;
+import java.io.FileNotFoundException;
+import java.io.IOException;
+import java.io.RandomAccessFile;
+
+public class FileSeekableOutputStream extends SeekableOutputStream {
+
+    private final RandomAccessFile file;
+
+    public FileSeekableOutputStream(String path) throws FileNotFoundException {
+        this(new File(path));
+    }
+
+    public FileSeekableOutputStream(File file) throws FileNotFoundException {
+        this(new RandomAccessFile(file, "rw"));
+    }
+
+    public FileSeekableOutputStream(RandomAccessFile file) {
+        this.file = file;
+    }
+
+    @Override
+    public void seek(long pos) throws IOException {
+        file.seek(pos);
+    }
+
+    @Override
+    public long tell() throws IOException {
+        return file.getFilePointer();
+    }
+
+    @Override
+    public long size() throws IOException {
+        return file.length();
+    }
+
+    @Override
+    public void truncate(long size) throws IOException {
+        file.setLength(size);
+    }
+
+    @Override
+    public void write(int b) throws IOException {
+        file.write(b);
+    }
+
+    @Override
+    public void write(@NonNull byte[] b) throws IOException {
+        file.write(b);
+    }
+
+    @Override
+    public void write(@NonNull byte[] b, int off, int len) throws IOException {
+        file.write(b, off, len);
+    }
+
+    @Override
+    public void close() throws IOException {
+        file.close();
+    }
+}