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| 1 | /* | ||
| 2 | * Copyright (c) 2003, 2009, 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 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 || len < 0 || len > b.length - off) { | ||
| 93 | throw new IndexOutOfBoundsException(); | ||
| 94 | } else if (len == 0) { | ||
| 95 | return 0; | ||
| 96 | } | ||
| 97 | |||
| 98 | int length = Math.min(bb.remaining(), len); | ||
| 99 | if (length == 0) { | ||
| 100 | return -1; | ||
| 101 | } | ||
| 102 | |||
| 103 | bb.get(b, off, length); | ||
| 104 | return length; | ||
| 105 | } | ||
| 106 | |||
| 107 | /** | ||
| 108 | * Skips over and discards <code>n</code> bytes of data from this input | ||
| 109 | * stream. | ||
| 110 | */ | ||
| 111 | public long skip(long n) throws IOException { | ||
| 112 | |||
| 113 | if (bb == null) { | ||
| 114 | throw new IOException("skip on a closed InputStream"); | ||
| 115 | } | ||
| 116 | |||
| 117 | if (n <= 0) { | ||
| 118 | return 0; | ||
| 119 | } | ||
| 120 | |||
| 121 | /* | ||
| 122 | * ByteBuffers have at most an int, so lose the upper bits. | ||
| 123 | * The contract allows this. | ||
| 124 | */ | ||
| 125 | int nInt = (int) n; | ||
| 126 | int skip = Math.min(bb.remaining(), nInt); | ||
| 127 | |||
| 128 | bb.position(bb.position() + skip); | ||
| 129 | |||
| 130 | return nInt; | ||
| 131 | } | ||
| 132 | |||
| 133 | /** | ||
| 134 | * Returns the number of bytes that can be read (or skipped over) | ||
| 135 | * from this input stream without blocking by the next caller of a | ||
| 136 | * method for this input stream. | ||
| 137 | */ | ||
| 138 | public int available() throws IOException { | ||
| 139 | |||
| 140 | if (bb == null) { | ||
| 141 | throw new IOException("available on a closed InputStream"); | ||
| 142 | } | ||
| 143 | |||
| 144 | return bb.remaining(); | ||
| 145 | } | ||
| 146 | |||
| 147 | /** | ||
| 148 | * Closes this input stream and releases any system resources associated | ||
| 149 | * with the stream. | ||
| 150 | * | ||
| 151 | * @exception IOException if an I/O error occurs. | ||
| 152 | */ | ||
| 153 | public void close() throws IOException { | ||
| 154 | bb = null; | ||
| 155 | } | ||
| 156 | |||
| 157 | /** | ||
| 158 | * Marks the current position in this input stream. | ||
| 159 | */ | ||
| 160 | public synchronized void mark(int readlimit) {} | ||
| 161 | |||
| 162 | /** | ||
| 163 | * Repositions this stream to the position at the time the | ||
| 164 | * <code>mark</code> method was last called on this input stream. | ||
| 165 | */ | ||
| 166 | public synchronized void reset() throws IOException { | ||
| 167 | throw new IOException("mark/reset not supported"); | ||
| 168 | } | ||
| 169 | |||
| 170 | /** | ||
| 171 | * Tests if this input stream supports the <code>mark</code> and | ||
| 172 | * <code>reset</code> methods. | ||
| 173 | */ | ||
| 174 | public boolean markSupported() { | ||
| 175 | return false; | ||
| 176 | } | ||
| 177 | } | ||