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src/share/jaxws_classes/com/sun/xml/internal/org/jvnet/mimepull/LineInputStream.java@373ffda63c9a (annotated)

src/share/jaxws_classes/com/sun/xml/internal/org/jvnet/mimepull/LineInputStream.java

Wed, 27 Apr 2016 01:27:09 +0800

author

aoqi

date

Wed, 27 Apr 2016 01:27:09 +0800

changeset 0

373ffda63c9a

permissions

-rw-r--r--

Initial load
http://hg.openjdk.java.net/jdk8u/jdk8u/jaxws/
changeset: 657:d47a47f961ee
tag: jdk8u25-b17

aoqi@0	1	/*
aoqi@0	2	* Copyright (c) 1997, 2012, Oracle and/or its affiliates. All rights reserved.
aoqi@0	3	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
aoqi@0	4	*
aoqi@0	5	* This code is free software; you can redistribute it and/or modify it
aoqi@0	6	* under the terms of the GNU General Public License version 2 only, as
aoqi@0	7	* published by the Free Software Foundation. Oracle designates this
aoqi@0	8	* particular file as subject to the "Classpath" exception as provided
aoqi@0	9	* by Oracle in the LICENSE file that accompanied this code.
aoqi@0	10	*
aoqi@0	11	* This code is distributed in the hope that it will be useful, but WITHOUT
aoqi@0	12	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
aoqi@0	13	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
aoqi@0	14	* version 2 for more details (a copy is included in the LICENSE file that
aoqi@0	15	* accompanied this code).
aoqi@0	16	*
aoqi@0	17	* You should have received a copy of the GNU General Public License version
aoqi@0	18	* 2 along with this work; if not, write to the Free Software Foundation,
aoqi@0	19	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
aoqi@0	20	*
aoqi@0	21	* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
aoqi@0	22	* or visit www.oracle.com if you need additional information or have any
aoqi@0	23	* questions.
aoqi@0	24	*/
aoqi@0	25
aoqi@0	26	/* FROM mail.jar */
aoqi@0	27	package com.sun.xml.internal.org.jvnet.mimepull;
aoqi@0	28
aoqi@0	29	import java.io.*;
aoqi@0	30
aoqi@0	31	/**
aoqi@0	32	* This class is to support reading CRLF terminated lines that
aoqi@0	33	* contain only US-ASCII characters from an input stream. Provides
aoqi@0	34	* functionality that is similar to the deprecated
aoqi@0	35	* <code>DataInputStream.readLine()</code>. Expected use is to read
aoqi@0	36	* lines as String objects from a RFC822 stream.
aoqi@0	37	*
aoqi@0	38	* It is implemented as a FilterInputStream, so one can just wrap
aoqi@0	39	* this class around any input stream and read bytes from this filter.
aoqi@0	40	*
aoqi@0	41	* @author John Mani
aoqi@0	42	*/
aoqi@0	43
aoqi@0	44	final class LineInputStream extends FilterInputStream {
aoqi@0	45
aoqi@0	46	private char[] lineBuffer = null; // reusable byte buffer
aoqi@0	47	private static int MAX_INCR = 1024*1024; // 1MB
aoqi@0	48
aoqi@0	49	public LineInputStream(InputStream in) {
aoqi@0	50	super(in);
aoqi@0	51	}
aoqi@0	52
aoqi@0	53	/**
aoqi@0	54	* Read a line containing only ASCII characters from the input
aoqi@0	55	* stream. A line is terminated by a CR or NL or CR-NL sequence.
aoqi@0	56	* A common error is a CR-CR-NL sequence, which will also terminate
aoqi@0	57	* a line.
aoqi@0	58	* The line terminator is not returned as part of the returned
aoqi@0	59	* String. Returns null if no data is available. <p>
aoqi@0	60	*
aoqi@0	61	* This class is similar to the deprecated
aoqi@0	62	* <code>DataInputStream.readLine()</code>
aoqi@0	63	*/
aoqi@0	64	public String readLine() throws IOException {
aoqi@0	65	//InputStream in = this.in;
aoqi@0	66	char[] buf = lineBuffer;
aoqi@0	67
aoqi@0	68	if (buf == null) {
aoqi@0	69	buf = lineBuffer = new char[128];
aoqi@0	70	}
aoqi@0	71
aoqi@0	72	int c1;
aoqi@0	73	int room = buf.length;
aoqi@0	74	int offset = 0;
aoqi@0	75
aoqi@0	76	while ((c1 = in.read()) != -1) {
aoqi@0	77	if (c1 == '\n') {
aoqi@0	78	break;
aoqi@0	79	} else if (c1 == '\r') {
aoqi@0	80	// Got CR, is the next char NL ?
aoqi@0	81	boolean twoCRs = false;
aoqi@0	82	if (in.markSupported()) {
aoqi@0	83	in.mark(2);
aoqi@0	84	}
aoqi@0	85	int c2 = in.read();
aoqi@0	86	if (c2 == '\r') { // discard extraneous CR
aoqi@0	87	twoCRs = true;
aoqi@0	88	c2 = in.read();
aoqi@0	89	}
aoqi@0	90	if (c2 != '\n') {
aoqi@0	91	/*
aoqi@0	92	* If the stream supports it (which we hope will always
aoqi@0	93	* be the case), reset to after the first CR. Otherwise,
aoqi@0	94	* we wrap a PushbackInputStream around the stream so we
aoqi@0	95	* can unread the characters we don't need. The only
aoqi@0	96	* problem with that is that the caller might stop
aoqi@0	97	* reading from this LineInputStream, throw it away,
aoqi@0	98	* and then start reading from the underlying stream.
aoqi@0	99	* If that happens, the pushed back characters will be
aoqi@0	100	* lost forever.
aoqi@0	101	*/
aoqi@0	102	if (in.markSupported()) {
aoqi@0	103	in.reset();
aoqi@0	104	} else {
aoqi@0	105	if (!(in instanceof PushbackInputStream)) {
aoqi@0	106	in /*= this.in*/ = new PushbackInputStream(in, 2);
aoqi@0	107	}
aoqi@0	108	if (c2 != -1) {
aoqi@0	109	((PushbackInputStream)in).unread(c2);
aoqi@0	110	}
aoqi@0	111	if (twoCRs) {
aoqi@0	112	((PushbackInputStream)in).unread('\r');
aoqi@0	113	}
aoqi@0	114	}
aoqi@0	115	}
aoqi@0	116	break; // outa here.
aoqi@0	117	}
aoqi@0	118
aoqi@0	119	// Not CR, NL or CR-NL ...
aoqi@0	120	// .. Insert the byte into our byte buffer
aoqi@0	121	if (--room < 0) { // No room, need to grow.
aoqi@0	122	if (buf.length < MAX_INCR) {
aoqi@0	123	buf = new char[buf.length * 2];
aoqi@0	124	} else {
aoqi@0	125	buf = new char[buf.length + MAX_INCR];
aoqi@0	126	}
aoqi@0	127	room = buf.length - offset - 1;
aoqi@0	128	System.arraycopy(lineBuffer, 0, buf, 0, offset);
aoqi@0	129	lineBuffer = buf;
aoqi@0	130	}
aoqi@0	131	buf[offset++] = (char)c1;
aoqi@0	132	}
aoqi@0	133
aoqi@0	134	if ((c1 == -1) && (offset == 0)) {
aoqi@0	135	return null;
aoqi@0	136	}
aoqi@0	137
aoqi@0	138	return String.copyValueOf(buf, 0, offset);
aoqi@0	139	}
aoqi@0	140	}