| /* |
| * Copyright (c) 2003, 2014, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This code 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 General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| package sun.security.ssl; |
| |
| import java.io.*; |
| import java.nio.*; |
| |
| /** |
| * A simple InputStream which uses ByteBuffers as it's backing store. |
| * <P> |
| * The only IOException should come if the InputStream has been closed. |
| * All other IOException should not occur because all the data is local. |
| * Data reads on an exhausted ByteBuffer returns a -1. |
| * |
| * @author Brad Wetmore |
| */ |
| class ByteBufferInputStream extends InputStream { |
| |
| ByteBuffer bb; |
| |
| ByteBufferInputStream(ByteBuffer bb) { |
| this.bb = bb; |
| } |
| |
| /** |
| * Returns a byte from the ByteBuffer. |
| * |
| * Increments position(). |
| */ |
| @Override |
| public int read() throws IOException { |
| |
| if (bb == null) { |
| throw new IOException("read on a closed InputStream"); |
| } |
| |
| if (bb.remaining() == 0) { |
| return -1; |
| } |
| |
| return (bb.get() & 0xFF); // need to be in the range 0 to 255 |
| } |
| |
| /** |
| * Returns a byte array from the ByteBuffer. |
| * |
| * Increments position(). |
| */ |
| @Override |
| public int read(byte[] b) throws IOException { |
| |
| if (bb == null) { |
| throw new IOException("read on a closed InputStream"); |
| } |
| |
| return read(b, 0, b.length); |
| } |
| |
| /** |
| * Returns a byte array from the ByteBuffer. |
| * |
| * Increments position(). |
| */ |
| @Override |
| public int read(byte[] b, int off, int len) throws IOException { |
| |
| if (bb == null) { |
| throw new IOException("read on a closed InputStream"); |
| } |
| |
| if (b == null) { |
| throw new NullPointerException(); |
| } else if (off < 0 || len < 0 || len > b.length - off) { |
| throw new IndexOutOfBoundsException(); |
| } else if (len == 0) { |
| return 0; |
| } |
| |
| int length = Math.min(bb.remaining(), len); |
| if (length == 0) { |
| return -1; |
| } |
| |
| bb.get(b, off, length); |
| return length; |
| } |
| |
| /** |
| * Skips over and discards <code>n</code> bytes of data from this input |
| * stream. |
| */ |
| @Override |
| public long skip(long n) throws IOException { |
| |
| if (bb == null) { |
| throw new IOException("skip on a closed InputStream"); |
| } |
| |
| if (n <= 0) { |
| return 0; |
| } |
| |
| /* |
| * ByteBuffers have at most an int, so lose the upper bits. |
| * The contract allows this. |
| */ |
| int nInt = (int) n; |
| int skip = Math.min(bb.remaining(), nInt); |
| |
| bb.position(bb.position() + skip); |
| |
| return nInt; |
| } |
| |
| /** |
| * Returns the number of bytes that can be read (or skipped over) |
| * from this input stream without blocking by the next caller of a |
| * method for this input stream. |
| */ |
| @Override |
| public int available() throws IOException { |
| |
| if (bb == null) { |
| throw new IOException("available on a closed InputStream"); |
| } |
| |
| return bb.remaining(); |
| } |
| |
| /** |
| * Closes this input stream and releases any system resources associated |
| * with the stream. |
| * |
| * @exception IOException if an I/O error occurs. |
| */ |
| @Override |
| public void close() throws IOException { |
| bb = null; |
| } |
| |
| /** |
| * Marks the current position in this input stream. |
| */ |
| @Override |
| public synchronized void mark(int readlimit) {} |
| |
| /** |
| * Repositions this stream to the position at the time the |
| * <code>mark</code> method was last called on this input stream. |
| */ |
| @Override |
| public synchronized void reset() throws IOException { |
| throw new IOException("mark/reset not supported"); |
| } |
| |
| /** |
| * Tests if this input stream supports the <code>mark</code> and |
| * <code>reset</code> methods. |
| */ |
| @Override |
| public boolean markSupported() { |
| return false; |
| } |
| } |