Mercurial > jdk8-mips64-public > jaxws / file comparison
comparison: src/share/jaxws_classes/com/sun/xml/internal/messaging/saaj/packaging/mime/util/LineInputStream.java
src/share/jaxws_classes/com/sun/xml/internal/messaging/saaj/packaging/mime/util/LineInputStream.java
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| 1 /* | |
| 2 * Copyright (c) 1997, 2012, 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 /* | |
| 27 * @(#)LineInputStream.java 1.7 03/01/07 | |
| 28 */ | |
| 29 | |
| 30 | |
| 31 | |
| 32 package com.sun.xml.internal.messaging.saaj.packaging.mime.util; | |
| 33 | |
| 34 import java.io.*; | |
| 35 | |
| 36 /** | |
| 37 * This class is to support reading CRLF terminated lines that | |
| 38 * contain only US-ASCII characters from an input stream. Provides | |
| 39 * functionality that is similar to the deprecated | |
| 40 * <code>DataInputStream.readLine()</code>. Expected use is to read | |
| 41 * lines as String objects from a RFC822 stream. | |
| 42 * | |
| 43 * It is implemented as a FilterInputStream, so one can just wrap | |
| 44 * this class around any input stream and read bytes from this filter. | |
| 45 * | |
| 46 * @author John Mani | |
| 47 */ | |
| 48 | |
| 49 public final class LineInputStream extends FilterInputStream { | |
| 50 | |
| 51 private char[] lineBuffer = null; // reusable byte buffer | |
| 52 | |
| 53 public LineInputStream(InputStream in) { | |
| 54 super(in); | |
| 55 } | |
| 56 | |
| 57 /** | |
| 58 * Read a line containing only ASCII characters from the input | |
| 59 * stream. A line is terminated by a CR or NL or CR-NL sequence. | |
| 60 * A common error is a CR-CR-NL sequence, which will also terminate | |
| 61 * a line. | |
| 62 * The line terminator is not returned as part of the returned | |
| 63 * String. Returns null if no data is available. <p> | |
| 64 * | |
| 65 * This class is similar to the deprecated | |
| 66 * <code>DataInputStream.readLine()</code> | |
| 67 */ | |
| 68 public String readLine() throws IOException { | |
| 69 InputStream in = this.in; | |
| 70 char[] buf = lineBuffer; | |
| 71 | |
| 72 if (buf == null) | |
| 73 buf = lineBuffer = new char[128]; | |
| 74 | |
| 75 int c1; | |
| 76 int room = buf.length; | |
| 77 int offset = 0; | |
| 78 | |
| 79 while ((c1 = in.read()) != -1) { | |
| 80 if (c1 == '\n') // Got NL, outa here. | |
| 81 break; | |
| 82 else if (c1 == '\r') { | |
| 83 // Got CR, is the next char NL ? | |
| 84 int c2 = in.read(); | |
| 85 if (c2 == '\r') // discard extraneous CR | |
| 86 c2 = in.read(); | |
| 87 if (c2 != '\n') { | |
| 88 // If not NL, push it back | |
| 89 if (!(in instanceof PushbackInputStream)) | |
| 90 in = this.in = new PushbackInputStream(in); | |
| 91 ((PushbackInputStream)in).unread(c2); | |
| 92 } | |
| 93 break; // outa here. | |
| 94 } | |
| 95 | |
| 96 // Not CR, NL or CR-NL ... | |
| 97 // .. Insert the byte into our byte buffer | |
| 98 if (--room < 0) { // No room, need to grow. | |
| 99 buf = new char[offset + 128]; | |
| 100 room = buf.length - offset - 1; | |
| 101 System.arraycopy(lineBuffer, 0, buf, 0, offset); | |
| 102 lineBuffer = buf; | |
| 103 } | |
| 104 buf[offset++] = (char)c1; | |
| 105 } | |
| 106 | |
| 107 if ((c1 == -1) && (offset == 0)) | |
| 108 return null; | |
| 109 | |
| 110 return String.copyValueOf(buf, 0, offset); | |
| 111 } | |
| 112 } |
