14fa0a3295bcacbdcd6a9e7709cf17aa5adb90356Scott Kennedy/**************************************************************** 24fa0a3295bcacbdcd6a9e7709cf17aa5adb90356Scott Kennedy * Licensed to the Apache Software Foundation (ASF) under one * 34fa0a3295bcacbdcd6a9e7709cf17aa5adb90356Scott Kennedy * or more contributor license agreements. See the NOTICE file * 44fa0a3295bcacbdcd6a9e7709cf17aa5adb90356Scott Kennedy * distributed with this work for additional information * 54fa0a3295bcacbdcd6a9e7709cf17aa5adb90356Scott Kennedy * regarding copyright ownership. The ASF licenses this file * 64fa0a3295bcacbdcd6a9e7709cf17aa5adb90356Scott Kennedy * to you under the Apache License, Version 2.0 (the * 74fa0a3295bcacbdcd6a9e7709cf17aa5adb90356Scott Kennedy * "License"); you may not use this file except in compliance * 84fa0a3295bcacbdcd6a9e7709cf17aa5adb90356Scott Kennedy * with the License. You may obtain a copy of the License at * 94fa0a3295bcacbdcd6a9e7709cf17aa5adb90356Scott Kennedy * * 104fa0a3295bcacbdcd6a9e7709cf17aa5adb90356Scott Kennedy * http://www.apache.org/licenses/LICENSE-2.0 * 114fa0a3295bcacbdcd6a9e7709cf17aa5adb90356Scott Kennedy * * 124fa0a3295bcacbdcd6a9e7709cf17aa5adb90356Scott Kennedy * Unless required by applicable law or agreed to in writing, * 134fa0a3295bcacbdcd6a9e7709cf17aa5adb90356Scott Kennedy * software distributed under the License is distributed on an * 144fa0a3295bcacbdcd6a9e7709cf17aa5adb90356Scott Kennedy * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY * 154fa0a3295bcacbdcd6a9e7709cf17aa5adb90356Scott Kennedy * KIND, either express or implied. See the License for the * 164fa0a3295bcacbdcd6a9e7709cf17aa5adb90356Scott Kennedy * specific language governing permissions and limitations * 174fa0a3295bcacbdcd6a9e7709cf17aa5adb90356Scott Kennedy * under the License. * 184fa0a3295bcacbdcd6a9e7709cf17aa5adb90356Scott Kennedy ****************************************************************/ 194fa0a3295bcacbdcd6a9e7709cf17aa5adb90356Scott Kennedy 204fa0a3295bcacbdcd6a9e7709cf17aa5adb90356Scott Kennedy 214fa0a3295bcacbdcd6a9e7709cf17aa5adb90356Scott Kennedypackage org.apache.james.mime4j.util; 224fa0a3295bcacbdcd6a9e7709cf17aa5adb90356Scott Kennedy 234fa0a3295bcacbdcd6a9e7709cf17aa5adb90356Scott Kennedyimport java.io.InputStream; 244fa0a3295bcacbdcd6a9e7709cf17aa5adb90356Scott Kennedyimport java.io.IOException; 254fa0a3295bcacbdcd6a9e7709cf17aa5adb90356Scott Kennedy 264fa0a3295bcacbdcd6a9e7709cf17aa5adb90356Scott Kennedypublic class PartialInputStream extends PositionInputStream { 274fa0a3295bcacbdcd6a9e7709cf17aa5adb90356Scott Kennedy private final long limit; 284fa0a3295bcacbdcd6a9e7709cf17aa5adb90356Scott Kennedy 294fa0a3295bcacbdcd6a9e7709cf17aa5adb90356Scott Kennedy public PartialInputStream(InputStream inputStream, long offset, long length) throws IOException { 304fa0a3295bcacbdcd6a9e7709cf17aa5adb90356Scott Kennedy super(inputStream); 314fa0a3295bcacbdcd6a9e7709cf17aa5adb90356Scott Kennedy inputStream.skip(offset); 324fa0a3295bcacbdcd6a9e7709cf17aa5adb90356Scott Kennedy this.limit = offset + length; 334fa0a3295bcacbdcd6a9e7709cf17aa5adb90356Scott Kennedy } 344fa0a3295bcacbdcd6a9e7709cf17aa5adb90356Scott Kennedy 354fa0a3295bcacbdcd6a9e7709cf17aa5adb90356Scott Kennedy public int available() throws IOException { 364fa0a3295bcacbdcd6a9e7709cf17aa5adb90356Scott Kennedy return Math.min(super.available(), getBytesLeft()); 374fa0a3295bcacbdcd6a9e7709cf17aa5adb90356Scott Kennedy } 384fa0a3295bcacbdcd6a9e7709cf17aa5adb90356Scott Kennedy 394fa0a3295bcacbdcd6a9e7709cf17aa5adb90356Scott Kennedy public int read() throws IOException { 404fa0a3295bcacbdcd6a9e7709cf17aa5adb90356Scott Kennedy if (limit > position) 414fa0a3295bcacbdcd6a9e7709cf17aa5adb90356Scott Kennedy return super.read(); 424fa0a3295bcacbdcd6a9e7709cf17aa5adb90356Scott Kennedy else 434fa0a3295bcacbdcd6a9e7709cf17aa5adb90356Scott Kennedy return -1; 444fa0a3295bcacbdcd6a9e7709cf17aa5adb90356Scott Kennedy } 454fa0a3295bcacbdcd6a9e7709cf17aa5adb90356Scott Kennedy 464fa0a3295bcacbdcd6a9e7709cf17aa5adb90356Scott Kennedy public int read(byte b[]) throws IOException { 474fa0a3295bcacbdcd6a9e7709cf17aa5adb90356Scott Kennedy return read(b, 0, b.length); 484fa0a3295bcacbdcd6a9e7709cf17aa5adb90356Scott Kennedy } 494fa0a3295bcacbdcd6a9e7709cf17aa5adb90356Scott Kennedy 504fa0a3295bcacbdcd6a9e7709cf17aa5adb90356Scott Kennedy public int read(byte b[], int off, int len) throws IOException { 514fa0a3295bcacbdcd6a9e7709cf17aa5adb90356Scott Kennedy len = Math.min(len, getBytesLeft()); 524fa0a3295bcacbdcd6a9e7709cf17aa5adb90356Scott Kennedy return super.read(b, off, len); //To change body of overridden methods use File | Settings | File Templates. 534fa0a3295bcacbdcd6a9e7709cf17aa5adb90356Scott Kennedy } 544fa0a3295bcacbdcd6a9e7709cf17aa5adb90356Scott Kennedy 554fa0a3295bcacbdcd6a9e7709cf17aa5adb90356Scott Kennedy public long skip(long n) throws IOException { 564fa0a3295bcacbdcd6a9e7709cf17aa5adb90356Scott Kennedy n = Math.min(n, getBytesLeft()); 574fa0a3295bcacbdcd6a9e7709cf17aa5adb90356Scott Kennedy return super.skip(n); //To change body of overridden methods use File | Settings | File Templates. 584fa0a3295bcacbdcd6a9e7709cf17aa5adb90356Scott Kennedy } 594fa0a3295bcacbdcd6a9e7709cf17aa5adb90356Scott Kennedy 604fa0a3295bcacbdcd6a9e7709cf17aa5adb90356Scott Kennedy private int getBytesLeft() { 614fa0a3295bcacbdcd6a9e7709cf17aa5adb90356Scott Kennedy return (int)Math.min(Integer.MAX_VALUE, limit - position); 624fa0a3295bcacbdcd6a9e7709cf17aa5adb90356Scott Kennedy } 634fa0a3295bcacbdcd6a9e7709cf17aa5adb90356Scott Kennedy} 64