| /* |
| * Copyright (C) 2013 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.providers.downloads; |
| |
| import java.io.InputStream; |
| |
| /** |
| * Provides fake data for large transfers. |
| */ |
| public class FakeInputStream extends InputStream { |
| private long mRemaining; |
| |
| public FakeInputStream(long length) { |
| mRemaining = length; |
| } |
| |
| @Override |
| public int read() { |
| final int value; |
| if (mRemaining > 0) { |
| mRemaining--; |
| return 0; |
| } else { |
| return -1; |
| } |
| } |
| |
| @Override |
| public int read(byte[] buffer, int offset, int length) { |
| throwsIfOutOfBounds(buffer.length, offset, length); |
| |
| if (length > mRemaining) { |
| length = (int) mRemaining; |
| } |
| mRemaining -= length; |
| |
| if (length == 0) { |
| return -1; |
| } else { |
| return length; |
| } |
| } |
| |
| private static void throwsIfOutOfBounds(int len, int offset, int count) { |
| if (len < 0) { |
| throw new ArrayIndexOutOfBoundsException("Negative length: " + len); |
| } |
| |
| if ((offset | count) < 0 || offset > len - count) { |
| throw new ArrayIndexOutOfBoundsException( |
| "length=" + len + "; regionStart=" + offset + "; regionLength=" + count); |
| } |
| } |
| } |