ohair@286: /*
alanb@368:  * Copyright (c) 1997, 2012, Oracle and/or its affiliates. All rights reserved.
ohair@286:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
ohair@286:  *
ohair@286:  * This code is free software; you can redistribute it and/or modify it
ohair@286:  * under the terms of the GNU General Public License version 2 only, as
ohair@286:  * published by the Free Software Foundation.  Oracle designates this
ohair@286:  * particular file as subject to the "Classpath" exception as provided
ohair@286:  * by Oracle in the LICENSE file that accompanied this code.
ohair@286:  *
ohair@286:  * This code is distributed in the hope that it will be useful, but WITHOUT
ohair@286:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
ohair@286:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
ohair@286:  * version 2 for more details (a copy is included in the LICENSE file that
ohair@286:  * accompanied this code).
ohair@286:  *
ohair@286:  * You should have received a copy of the GNU General Public License version
ohair@286:  * 2 along with this work; if not, write to the Free Software Foundation,
ohair@286:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
ohair@286:  *
ohair@286:  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
ohair@286:  * or visit www.oracle.com if you need additional information or have any
ohair@286:  * questions.
ohair@286:  */
ohair@286: 
ohair@286: package com.sun.xml.internal.org.jvnet.mimepull;
ohair@286: 
ohair@286: import java.io.InputStream;
ohair@286: import java.io.IOException;
ohair@286: 
ohair@286: /**
ohair@286:  * Constructs a InputStream from a linked list of {@link Chunk}s.
ohair@286:  *
ohair@286:  * @author Kohsuke Kawaguchi
ohair@286:  * @author Jitendra Kotamraju
ohair@286:  */
ohair@286: final class ChunkInputStream extends InputStream {
ohair@286:     Chunk current;
ohair@286:     int offset;
ohair@286:     int len;
ohair@286:     final MIMEMessage msg;
ohair@286:     final MIMEPart part;
ohair@286:     byte[] buf;
ohair@286: 
ohair@286:     public ChunkInputStream(MIMEMessage msg, MIMEPart part, Chunk startPos) {
ohair@286:         this.current = startPos;
ohair@286:         len = current.data.size();
ohair@286:         buf = current.data.read();
ohair@286:         this.msg = msg;
ohair@286:         this.part = part;
ohair@286:     }
ohair@286: 
ohair@286:     @Override
ohair@286:     public int read(byte b[], int off, int sz) throws IOException {
alanb@368:         if (!fetch()) {
alanb@368:             return -1;
alanb@368:         }
ohair@286: 
ohair@286:         sz = Math.min(sz, len-offset);
ohair@286:         System.arraycopy(buf,offset,b,off,sz);
ohair@286:         return sz;
ohair@286:     }
ohair@286: 
ohair@286:     public int read() throws IOException {
alanb@368:         if (!fetch()) {
alanb@368:             return -1;
alanb@368:         }
ohair@286:         return (buf[offset++] & 0xff);
ohair@286:     }
ohair@286: 
ohair@286:     /**
ohair@286:      * Gets to the next chunk if we are done with the current one.
ohair@286:      * @return
ohair@286:      */
ohair@286:     private boolean fetch() {
ohair@286:         if (current == null) {
ohair@286:             throw new IllegalStateException("Stream already closed");
ohair@286:         }
ohair@286:         while(offset==len) {
ohair@286:             while(!part.parsed && current.next == null) {
ohair@286:                 msg.makeProgress();
ohair@286:             }
ohair@286:             current = current.next;
ohair@286: 
ohair@286:             if (current == null) {
ohair@286:                 return false;
ohair@286:             }
ohair@286:             this.offset = 0;
ohair@286:             this.buf = current.data.read();
ohair@286:             this.len = current.data.size();
ohair@286:         }
ohair@286:         return true;
ohair@286:     }
ohair@286: 
alanb@368:     @Override
ohair@286:     public void close() throws IOException {
ohair@286:         super.close();
ohair@286:         current = null;
ohair@286:     }
ohair@286: }