/*
* Copyright (c) 2019, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* The Universal Permissive License (UPL), Version 1.0
*
* Subject to the condition set forth below, permission is hereby granted to any
* person obtaining a copy of this software, associated documentation and/or
* data (collectively the "Software"), free of charge and under any and all
* copyright rights in the Software, and any and all patent rights owned or
* freely licensable by each licensor hereunder covering either (i) the
* unmodified Software as contributed to or provided by such licensor, or (ii)
* the Larger Works (as defined below), to deal in both
*
* (a) the Software, and
*
* (b) any piece of software and/or hardware listed in the lrgrwrks.txt file if
* one is included with the Software each a "Larger Work" to which the Software
* is contributed by such licensors),
*
* without restriction, including without limitation the rights to copy, create
* derivative works of, display, perform, and distribute the Software and make,
* use, sell, offer for sale, import, export, have made, and have sold the
* Software and the Larger Work(s), and to sublicense the foregoing rights on
* either these or other terms.
*
* This license is subject to the following condition:
*
* The above copyright notice and either this complete permission notice or at a
* minimum a reference to the UPL must be included in all copies or substantial
* portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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*/
package org.graalvm.wasm.collection;
import java.util.Arrays;
import java.util.NoSuchElementException;
public final class ByteArrayList {
private static final byte[] EMPTY_BYTE_ARRAY = new byte[0];
private byte[] array;
private int size;
public ByteArrayList() {
this.array = null;
this.size = 0;
}
public void add(byte b) {
ensureSize();
array[size] = b;
size++;
}
public void push(byte b) {
add(b);
}
public byte popBack() {
if (size() == 0) {
throw new NoSuchElementException("Cannot pop from an empty ByteArrayList.");
}
size--;
return array[size];
}
public byte top() {
return array[size - 1];
}
public void set(int index, byte b) {
if (index >= size()) {
throw new IndexOutOfBoundsException("Index " + index + " greater or equal to list size" + size() + ".");
}
array[index] = b;
}
public byte get(int index) {
if (index >= size()) {
throw new IndexOutOfBoundsException("Index " + index + " greater or equal to list size" + size() + ".");
}
return array[index];
}
public int size() {
return size;
}
private void ensureSize() {
if (array == null) {
array = new byte[4];
} else if (size == array.length) {
byte[] narray = new byte[array.length * 2];
System.arraycopy(array, 0, narray, 0, size);
array = narray;
}
}
public byte[] toArray() {
byte[] result = new byte[size];
if (array != null) {
System.arraycopy(array, 0, result, 0, size);
return result;
} else {
return EMPTY_BYTE_ARRAY;
}
}
public static byte[] concat(ByteArrayList... byteArrayLists) {
int totalSize = Arrays.stream(byteArrayLists).mapToInt(ByteArrayList::size).sum();
byte[] result = new byte[totalSize];
int resultOffset = 0;
for (ByteArrayList byteArrayList : byteArrayLists) {
if (byteArrayList.array != null) {
System.arraycopy(byteArrayList.array, 0, result, resultOffset, byteArrayList.size);
resultOffset += byteArrayList.size;
}
}
return result;
}
}