| /* |
| * Copyright (C) 2020 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.server.integrity.model; |
| |
| import java.io.IOException; |
| import java.io.OutputStream; |
| |
| /** |
| * An output stream that tracks the total number written bytes since construction and allows |
| * querying this value any time during the execution. |
| * |
| * <p>This class is used for constructing the rule indexing. |
| */ |
| public class ByteTrackedOutputStream extends OutputStream { |
| |
| private int mWrittenBytesCount; |
| private final OutputStream mOutputStream; |
| |
| public ByteTrackedOutputStream(OutputStream outputStream) { |
| mWrittenBytesCount = 0; |
| mOutputStream = outputStream; |
| } |
| |
| @Override |
| public void write(int b) throws IOException { |
| mWrittenBytesCount++; |
| mOutputStream.write(b); |
| } |
| |
| /** |
| * Writes the given bytes into the output stream provided in constructor and updates the total |
| * number of written bytes. |
| */ |
| @Override |
| public void write(byte[] bytes) throws IOException { |
| write(bytes, 0, bytes.length); |
| } |
| |
| @Override |
| public void write(byte[] b, int off, int len) throws IOException { |
| mWrittenBytesCount += len; |
| mOutputStream.write(b, off, len); |
| } |
| |
| /** Returns the total number of bytes written into the output stream at the requested time. */ |
| public int getWrittenBytesCount() { |
| return mWrittenBytesCount; |
| } |
| } |