J. Duke | 319a3b9 | 2007-12-01 00:00:00 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 2003-2007 Sun Microsystems, Inc. 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. Sun designates this |
| 8 | * particular file as subject to the "Classpath" exception as provided |
| 9 | * by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
| 22 | * CA 95054 USA or visit www.sun.com if you need additional information or |
| 23 | * have any questions. |
| 24 | */ |
| 25 | |
| 26 | package sun.security.ssl; |
| 27 | |
| 28 | import java.io.*; |
| 29 | import java.nio.*; |
| 30 | |
| 31 | /** |
| 32 | * A simple InputStream which uses ByteBuffers as it's backing store. |
| 33 | * <P> |
| 34 | * The only IOException should come if the InputStream has been closed. |
| 35 | * All other IOException should not occur because all the data is local. |
| 36 | * Data reads on an exhausted ByteBuffer returns a -1. |
| 37 | * |
| 38 | * @author Brad Wetmore |
| 39 | */ |
| 40 | class ByteBufferInputStream extends InputStream { |
| 41 | |
| 42 | ByteBuffer bb; |
| 43 | |
| 44 | ByteBufferInputStream(ByteBuffer bb) { |
| 45 | this.bb = bb; |
| 46 | } |
| 47 | |
| 48 | /** |
| 49 | * Returns a byte from the ByteBuffer. |
| 50 | * |
| 51 | * Increments position(). |
| 52 | */ |
| 53 | public int read() throws IOException { |
| 54 | |
| 55 | if (bb == null) { |
| 56 | throw new IOException("read on a closed InputStream"); |
| 57 | } |
| 58 | |
| 59 | if (bb.remaining() == 0) { |
| 60 | return -1; |
| 61 | } |
| 62 | return bb.get(); |
| 63 | } |
| 64 | |
| 65 | /** |
| 66 | * Returns a byte array from the ByteBuffer. |
| 67 | * |
| 68 | * Increments position(). |
| 69 | */ |
| 70 | public int read(byte b[]) throws IOException { |
| 71 | |
| 72 | if (bb == null) { |
| 73 | throw new IOException("read on a closed InputStream"); |
| 74 | } |
| 75 | |
| 76 | return read(b, 0, b.length); |
| 77 | } |
| 78 | |
| 79 | /** |
| 80 | * Returns a byte array from the ByteBuffer. |
| 81 | * |
| 82 | * Increments position(). |
| 83 | */ |
| 84 | public int read(byte b[], int off, int len) throws IOException { |
| 85 | |
| 86 | if (bb == null) { |
| 87 | throw new IOException("read on a closed InputStream"); |
| 88 | } |
| 89 | |
| 90 | if (b == null) { |
| 91 | throw new NullPointerException(); |
| 92 | } else if ((off < 0) || (off > b.length) || (len < 0) || |
| 93 | ((off + len) > b.length) || ((off + len) < 0)) { |
| 94 | throw new IndexOutOfBoundsException(); |
| 95 | } else if (len == 0) { |
| 96 | return 0; |
| 97 | } |
| 98 | |
| 99 | int length = Math.min(bb.remaining(), len); |
| 100 | if (length == 0) { |
| 101 | return -1; |
| 102 | } |
| 103 | |
| 104 | bb.get(b, off, length); |
| 105 | return length; |
| 106 | } |
| 107 | |
| 108 | /** |
| 109 | * Skips over and discards <code>n</code> bytes of data from this input |
| 110 | * stream. |
| 111 | */ |
| 112 | public long skip(long n) throws IOException { |
| 113 | |
| 114 | if (bb == null) { |
| 115 | throw new IOException("skip on a closed InputStream"); |
| 116 | } |
| 117 | |
| 118 | if (n <= 0) { |
| 119 | return 0; |
| 120 | } |
| 121 | |
| 122 | /* |
| 123 | * ByteBuffers have at most an int, so lose the upper bits. |
| 124 | * The contract allows this. |
| 125 | */ |
| 126 | int nInt = (int) n; |
| 127 | int skip = Math.min(bb.remaining(), nInt); |
| 128 | |
| 129 | bb.position(bb.position() + skip); |
| 130 | |
| 131 | return nInt; |
| 132 | } |
| 133 | |
| 134 | /** |
| 135 | * Returns the number of bytes that can be read (or skipped over) |
| 136 | * from this input stream without blocking by the next caller of a |
| 137 | * method for this input stream. |
| 138 | */ |
| 139 | public int available() throws IOException { |
| 140 | |
| 141 | if (bb == null) { |
| 142 | throw new IOException("available on a closed InputStream"); |
| 143 | } |
| 144 | |
| 145 | return bb.remaining(); |
| 146 | } |
| 147 | |
| 148 | /** |
| 149 | * Closes this input stream and releases any system resources associated |
| 150 | * with the stream. |
| 151 | * |
| 152 | * @exception IOException if an I/O error occurs. |
| 153 | */ |
| 154 | public void close() throws IOException { |
| 155 | bb = null; |
| 156 | } |
| 157 | |
| 158 | /** |
| 159 | * Marks the current position in this input stream. |
| 160 | */ |
| 161 | public synchronized void mark(int readlimit) {} |
| 162 | |
| 163 | /** |
| 164 | * Repositions this stream to the position at the time the |
| 165 | * <code>mark</code> method was last called on this input stream. |
| 166 | */ |
| 167 | public synchronized void reset() throws IOException { |
| 168 | throw new IOException("mark/reset not supported"); |
| 169 | } |
| 170 | |
| 171 | /** |
| 172 | * Tests if this input stream supports the <code>mark</code> and |
| 173 | * <code>reset</code> methods. |
| 174 | */ |
| 175 | public boolean markSupported() { |
| 176 | return false; |
| 177 | } |
| 178 | } |