Showing the changes to java/pkg/sun/security/ssl/ByteBufferInputStream.java (1 of 18352 files). Show all
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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 | +} | |