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src/share/classes/com/sun/tools/javac/util/ByteBuffer.java@2eb010b6cb22 (annotated)

src/share/classes/com/sun/tools/javac/util/ByteBuffer.java

Thu, 31 Aug 2017 15:17:03 +0800

author

aoqi

date

Thu, 31 Aug 2017 15:17:03 +0800

changeset 2525

2eb010b6cb22

parent 1339

0e5899f09dab

parent 0

959103a6100f

permissions

-rw-r--r--

merge

aoqi@0	1	/*
aoqi@0	2	* Copyright (c) 1999, 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	package com.sun.tools.javac.util;
aoqi@0	27
aoqi@0	28	import java.io.*;
aoqi@0	29
aoqi@0	30	/** A byte buffer is a flexible array which grows when elements are
aoqi@0	31	* appended. There are also methods to append names to byte buffers
aoqi@0	32	* and to convert byte buffers to names.
aoqi@0	33	*
aoqi@0	34	* <p><b>This is NOT part of any supported API.
aoqi@0	35	* If you write code that depends on this, you do so at your own risk.
aoqi@0	36	* This code and its internal interfaces are subject to change or
aoqi@0	37	* deletion without notice.</b>
aoqi@0	38	*/
aoqi@0	39	public class ByteBuffer {
aoqi@0	40
aoqi@0	41	/** An array holding the bytes in this buffer; can be grown.
aoqi@0	42	*/
aoqi@0	43	public byte[] elems;
aoqi@0	44
aoqi@0	45	/** The current number of defined bytes in this buffer.
aoqi@0	46	*/
aoqi@0	47	public int length;
aoqi@0	48
aoqi@0	49	/** Create a new byte buffer.
aoqi@0	50	*/
aoqi@0	51	public ByteBuffer() {
aoqi@0	52	this(64);
aoqi@0	53	}
aoqi@0	54
aoqi@0	55	/** Create a new byte buffer with an initial elements array
aoqi@0	56	* of given size.
aoqi@0	57	*/
aoqi@0	58	public ByteBuffer(int initialSize) {
aoqi@0	59	elems = new byte[initialSize];
aoqi@0	60	length = 0;
aoqi@0	61	}
aoqi@0	62
aoqi@0	63	/** Append byte to this buffer.
aoqi@0	64	*/
aoqi@0	65	public void appendByte(int b) {
aoqi@0	66	elems = ArrayUtils.ensureCapacity(elems, length);
aoqi@0	67	elems[length++] = (byte)b;
aoqi@0	68	}
aoqi@0	69
aoqi@0	70	/** Append `len' bytes from byte array,
aoqi@0	71	* starting at given `start' offset.
aoqi@0	72	*/
aoqi@0	73	public void appendBytes(byte[] bs, int start, int len) {
aoqi@0	74	elems = ArrayUtils.ensureCapacity(elems, length + len);
aoqi@0	75	System.arraycopy(bs, start, elems, length, len);
aoqi@0	76	length += len;
aoqi@0	77	}
aoqi@0	78
aoqi@0	79	/** Append all bytes from given byte array.
aoqi@0	80	*/
aoqi@0	81	public void appendBytes(byte[] bs) {
aoqi@0	82	appendBytes(bs, 0, bs.length);
aoqi@0	83	}
aoqi@0	84
aoqi@0	85	/** Append a character as a two byte number.
aoqi@0	86	*/
aoqi@0	87	public void appendChar(int x) {
aoqi@0	88	elems = ArrayUtils.ensureCapacity(elems, length + 1);
aoqi@0	89	elems[length ] = (byte)((x >> 8) & 0xFF);
aoqi@0	90	elems[length+1] = (byte)((x ) & 0xFF);
aoqi@0	91	length = length + 2;
aoqi@0	92	}
aoqi@0	93
aoqi@0	94	/** Append an integer as a four byte number.
aoqi@0	95	*/
aoqi@0	96	public void appendInt(int x) {
aoqi@0	97	elems = ArrayUtils.ensureCapacity(elems, length + 3);
aoqi@0	98	elems[length ] = (byte)((x >> 24) & 0xFF);
aoqi@0	99	elems[length+1] = (byte)((x >> 16) & 0xFF);
aoqi@0	100	elems[length+2] = (byte)((x >> 8) & 0xFF);
aoqi@0	101	elems[length+3] = (byte)((x ) & 0xFF);
aoqi@0	102	length = length + 4;
aoqi@0	103	}
aoqi@0	104
aoqi@0	105	/** Append a long as an eight byte number.
aoqi@0	106	*/
aoqi@0	107	public void appendLong(long x) {
aoqi@0	108	ByteArrayOutputStream buffer = new ByteArrayOutputStream(8);
aoqi@0	109	DataOutputStream bufout = new DataOutputStream(buffer);
aoqi@0	110	try {
aoqi@0	111	bufout.writeLong(x);
aoqi@0	112	appendBytes(buffer.toByteArray(), 0, 8);
aoqi@0	113	} catch (IOException e) {
aoqi@0	114	throw new AssertionError("write");
aoqi@0	115	}
aoqi@0	116	}
aoqi@0	117
aoqi@0	118	/** Append a float as a four byte number.
aoqi@0	119	*/
aoqi@0	120	public void appendFloat(float x) {
aoqi@0	121	ByteArrayOutputStream buffer = new ByteArrayOutputStream(4);
aoqi@0	122	DataOutputStream bufout = new DataOutputStream(buffer);
aoqi@0	123	try {
aoqi@0	124	bufout.writeFloat(x);
aoqi@0	125	appendBytes(buffer.toByteArray(), 0, 4);
aoqi@0	126	} catch (IOException e) {
aoqi@0	127	throw new AssertionError("write");
aoqi@0	128	}
aoqi@0	129	}
aoqi@0	130
aoqi@0	131	/** Append a double as a eight byte number.
aoqi@0	132	*/
aoqi@0	133	public void appendDouble(double x) {
aoqi@0	134	ByteArrayOutputStream buffer = new ByteArrayOutputStream(8);
aoqi@0	135	DataOutputStream bufout = new DataOutputStream(buffer);
aoqi@0	136	try {
aoqi@0	137	bufout.writeDouble(x);
aoqi@0	138	appendBytes(buffer.toByteArray(), 0, 8);
aoqi@0	139	} catch (IOException e) {
aoqi@0	140	throw new AssertionError("write");
aoqi@0	141	}
aoqi@0	142	}
aoqi@0	143
aoqi@0	144	/** Append a name.
aoqi@0	145	*/
aoqi@0	146	public void appendName(Name name) {
aoqi@0	147	appendBytes(name.getByteArray(), name.getByteOffset(), name.getByteLength());
aoqi@0	148	}
aoqi@0	149
aoqi@0	150	/** Reset to zero length.
aoqi@0	151	*/
aoqi@0	152	public void reset() {
aoqi@0	153	length = 0;
aoqi@0	154	}
aoqi@0	155
aoqi@0	156	/** Convert contents to name.
aoqi@0	157	*/
aoqi@0	158	public Name toName(Names names) {
aoqi@0	159	return names.fromUtf(elems, 0, length);
aoqi@0	160	}
aoqi@0	161	}