| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You 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 org.apache.ant.compress.resources; |
| |
| import org.apache.tools.ant.types.Resource; |
| import java.io.InputStream; |
| import java.util.Arrays; |
| |
| /** |
| * A resource that returns arbitrary many 0-bytes as its content. |
| * |
| * <p>This class should likely be part of Ant and only lives here as |
| * it is needed for tests.</p> |
| * |
| * @since Compress Antlib 1.2 |
| */ |
| public class DevZeroResource extends Resource { |
| |
| @Override |
| public InputStream getInputStream() { |
| final long size = getSize(); |
| return new InputStream() { |
| private long bytesRead = 0; |
| public int read() { |
| return bytesRead++ < size ? 0 : -1; |
| } |
| public int read(byte[] b) { |
| return read(b, 0, b.length); |
| } |
| public int read(byte[] b, int off, int len) { |
| len = (int) Math.min((long) len, size - bytesRead); |
| bytesRead += len; |
| Arrays.fill(b, off, off + len, (byte) 0); |
| return len == 0 ? -1 : len; |
| } |
| }; |
| } |
| } |