/* * Copyright (C) 2005-2010 Alfresco Software Limited. * * This file is part of Alfresco * * Alfresco is free software: you can redistribute it and/or modify * it under the terms of the GNU Lesser General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * * Alfresco is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public License * along with Alfresco. If not, see . */ package org.alfresco.opencmis; import java.io.IOException; import java.io.InputStream; public class RangeInputStream extends InputStream { private InputStream inputStream; private long bytesRead; private long length; public RangeInputStream(InputStream inputStream, long offset, long length) throws IOException { super(); this.inputStream = inputStream; this.length = length; this.bytesRead = 0; long l = this.inputStream.skip(offset); if (l < offset) { this.inputStream.skip(offset); } } @Override public int read() throws IOException { if (bytesRead < length) { bytesRead++; return inputStream.read(); } else { return -1; } } @Override public int read(byte[] b) throws IOException { return read(b, 0, b.length); } @Override public int read(byte[] b, int off, int len) throws IOException { if(length - bytesRead == 0) { return -1; } if (len > length - bytesRead) { len = (int) (length - bytesRead); } int readed = inputStream.read(b, off, len); bytesRead += readed; return readed; } @Override public int available() throws IOException { return (int) (length - bytesRead + 1); } @Override public void close() throws IOException { inputStream.close(); } @Override public long skip(long n) throws IOException { if (bytesRead + n > length) { n = (length - n) > 0 ? (length - n) : length - bytesRead; } n = inputStream.skip(n); bytesRead += n; return n; } }