| /* |
| * Copyright (c) 1999, 2012, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| package com.sun.tools.javac.util; |
| |
| import java.io.*; |
| |
| /** A byte buffer is a flexible array which grows when elements are |
| * appended. There are also methods to append names to byte buffers |
| * and to convert byte buffers to names. |
| * |
| * <p><b>This is NOT part of any supported API. |
| * If you write code that depends on this, you do so at your own risk. |
| * This code and its internal interfaces are subject to change or |
| * deletion without notice.</b> |
| */ |
| public class ByteBuffer { |
| |
| /** An array holding the bytes in this buffer; can be grown. |
| */ |
| public byte[] elems; |
| |
| /** The current number of defined bytes in this buffer. |
| */ |
| public int length; |
| |
| /** Create a new byte buffer. |
| */ |
| public ByteBuffer() { |
| this(64); |
| } |
| |
| /** Create a new byte buffer with an initial elements array |
| * of given size. |
| */ |
| public ByteBuffer(int initialSize) { |
| elems = new byte[initialSize]; |
| length = 0; |
| } |
| |
| /** Append byte to this buffer. |
| */ |
| public void appendByte(int b) { |
| elems = ArrayUtils.ensureCapacity(elems, length); |
| elems[length++] = (byte)b; |
| } |
| |
| /** Append `len' bytes from byte array, |
| * starting at given `start' offset. |
| */ |
| public void appendBytes(byte[] bs, int start, int len) { |
| elems = ArrayUtils.ensureCapacity(elems, length + len); |
| System.arraycopy(bs, start, elems, length, len); |
| length += len; |
| } |
| |
| /** Append all bytes from given byte array. |
| */ |
| public void appendBytes(byte[] bs) { |
| appendBytes(bs, 0, bs.length); |
| } |
| |
| /** Append a character as a two byte number. |
| */ |
| public void appendChar(int x) { |
| elems = ArrayUtils.ensureCapacity(elems, length + 1); |
| elems[length ] = (byte)((x >> 8) & 0xFF); |
| elems[length+1] = (byte)((x ) & 0xFF); |
| length = length + 2; |
| } |
| |
| /** Append an integer as a four byte number. |
| */ |
| public void appendInt(int x) { |
| elems = ArrayUtils.ensureCapacity(elems, length + 3); |
| elems[length ] = (byte)((x >> 24) & 0xFF); |
| elems[length+1] = (byte)((x >> 16) & 0xFF); |
| elems[length+2] = (byte)((x >> 8) & 0xFF); |
| elems[length+3] = (byte)((x ) & 0xFF); |
| length = length + 4; |
| } |
| |
| /** Append a long as an eight byte number. |
| */ |
| public void appendLong(long x) { |
| ByteArrayOutputStream buffer = new ByteArrayOutputStream(8); |
| DataOutputStream bufout = new DataOutputStream(buffer); |
| try { |
| bufout.writeLong(x); |
| appendBytes(buffer.toByteArray(), 0, 8); |
| } catch (IOException e) { |
| throw new AssertionError("write"); |
| } |
| } |
| |
| /** Append a float as a four byte number. |
| */ |
| public void appendFloat(float x) { |
| ByteArrayOutputStream buffer = new ByteArrayOutputStream(4); |
| DataOutputStream bufout = new DataOutputStream(buffer); |
| try { |
| bufout.writeFloat(x); |
| appendBytes(buffer.toByteArray(), 0, 4); |
| } catch (IOException e) { |
| throw new AssertionError("write"); |
| } |
| } |
| |
| /** Append a double as a eight byte number. |
| */ |
| public void appendDouble(double x) { |
| ByteArrayOutputStream buffer = new ByteArrayOutputStream(8); |
| DataOutputStream bufout = new DataOutputStream(buffer); |
| try { |
| bufout.writeDouble(x); |
| appendBytes(buffer.toByteArray(), 0, 8); |
| } catch (IOException e) { |
| throw new AssertionError("write"); |
| } |
| } |
| |
| /** Append a name. |
| */ |
| public void appendName(Name name) { |
| appendBytes(name.getByteArray(), name.getByteOffset(), name.getByteLength()); |
| } |
| |
| /** Reset to zero length. |
| */ |
| public void reset() { |
| length = 0; |
| } |
| |
| /** Convert contents to name. |
| */ |
| public Name toName(Names names) { |
| return names.fromUtf(elems, 0, length); |
| } |
| } |