138 lines
4.0 KiB
Java
138 lines
4.0 KiB
Java
/*
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* Copyright (c) 2009, 2019, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package org.openjdk.asmtools.jcoder;
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/**
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* Compiles just 1 source file
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*/
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class ByteBuffer extends java.io.OutputStream {
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String myname;
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/**
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* The buffer where elements are stored.
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*/
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byte data[];
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/**
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* The number of elements in the buffer.
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*/
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int length;
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/**
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* The size of the increment. If it is 0 the size of the the buffer is doubled
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* everytime it needs to grow.
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*/
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protected int capacityIncrement;
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/**
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* Constructs an empty vector with the specified storage capacity and the specified
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* capacityIncrement.
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*
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* @param initialCapacity the initial storage capacity of the vector
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* @param capacityIncrement how much to increase the element's size by.
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*/
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public ByteBuffer(int initialCapacity, int capacityIncrement) {
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// super();
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this.data = new byte[initialCapacity];
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this.capacityIncrement = capacityIncrement;
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}
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/**
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* Constructs an empty vector with the specified storage capacity.
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*
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* @param initialCapacity the initial storage capacity of the vector
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*/
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public ByteBuffer(int initialCapacity) {
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this(initialCapacity, 0);
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}
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/**
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* Constructs an empty vector.
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*/
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public ByteBuffer() {
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this(30);
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}
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/**
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* Constructs a full vector.
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*/
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public ByteBuffer(byte data[], int capacityIncrement) {
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this.length = data.length;
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this.data = data;
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this.capacityIncrement = capacityIncrement;
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}
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/**
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* Constructs a full vector.
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*/
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public ByteBuffer(byte data[]) {
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this(data, 0);
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}
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/**
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* Returns the number of elements in the vector. Note that this is not the same as the
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* vector's capacity.
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*/
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public final int size() {
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return length;
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}
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/**
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* Ensures that the vector has at least the specified capacity.
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*
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* @param minCapacity the desired minimum capacity
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*/
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public final synchronized void ensureCapacity(int minCapacity) {
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int oldCapacity = data.length;
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if (minCapacity <= oldCapacity) {
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return;
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}
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byte oldData[] = data;
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int newCapacity = (capacityIncrement > 0) ? (oldCapacity + capacityIncrement) : (oldCapacity * 2);
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if (newCapacity < minCapacity) {
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newCapacity = minCapacity;
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}
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data = new byte[newCapacity];
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System.arraycopy(oldData, 0, data, 0, length);
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}
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/*======================================*/
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public void write(int val) {
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ensureCapacity(length + 1);
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data[length++] = (byte) val;
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}
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public void writeAt(int index, long val, int width) {
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for (int i = 0; i < width; i++) {
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data[index + i] = (byte) (val >> (width - 1 - i) * 8);
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}
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}
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public void append(long val, int width) {
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ensureCapacity(length + width);
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writeAt(length, val, width);
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length += width;
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}
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/*======================================================*/
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} // end ByteBuffer
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