1 /* 2 * Copyright (c) 1997, 2012, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. Oracle designates this 8 * particular file as subject to the "Classpath" exception as provided 9 * by Oracle in the LICENSE file that accompanied this code. 10 * 11 * This code is distributed in the hope that it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14 * version 2 for more details (a copy is included in the LICENSE file that 15 * accompanied this code). 16 * 17 * You should have received a copy of the GNU General Public License version 18 * 2 along with this work; if not, write to the Free Software Foundation, 19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 20 * 21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 22 * or visit www.oracle.com if you need additional information or have any 23 * questions. 24 */ 25 26 package com.sun.xml.internal.org.jvnet.mimepull; 27 28 import java.io.InputStream; 29 import java.io.IOException; 30 31 /** 32 * Constructs a InputStream from a linked list of {@link Chunk}s. 33 * 34 * @author Kohsuke Kawaguchi 35 * @author Jitendra Kotamraju 36 */ 37 final class ChunkInputStream extends InputStream { 38 Chunk current; 39 int offset; 40 int len; 41 final MIMEMessage msg; 42 final MIMEPart part; 43 byte[] buf; 44 45 public ChunkInputStream(MIMEMessage msg, MIMEPart part, Chunk startPos) { 46 this.current = startPos; 47 len = current.data.size(); 48 buf = current.data.read(); 49 this.msg = msg; 50 this.part = part; 51 } 52 53 @Override 54 public int read(byte b[], int off, int sz) throws IOException { 55 if (!fetch()) { 56 return -1; 57 } 58 59 sz = Math.min(sz, len-offset); 60 System.arraycopy(buf,offset,b,off,sz); 61 return sz; 62 } 63 64 public int read() throws IOException { 65 if (!fetch()) { 66 return -1; 67 } 68 return (buf[offset++] & 0xff); 69 } 70 71 /** 72 * Gets to the next chunk if we are done with the current one. 73 * @return 74 */ 75 private boolean fetch() { 76 if (current == null) { 77 throw new IllegalStateException("Stream already closed"); 78 } 79 while(offset==len) { 80 while(!part.parsed && current.next == null) { 81 msg.makeProgress(); 82 } 83 current = current.next; 84 85 if (current == null) { 86 return false; 87 } 88 this.offset = 0; 89 this.buf = current.data.read(); 90 this.len = current.data.size(); 91 } 92 return true; 93 } 94 95 @Override 96 public void close() throws IOException { 97 super.close(); 98 current = null; 99 } 100 }