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109 lines
3.5 KiB
Java
109 lines
3.5 KiB
Java
/*
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* Copyright (c) 2023, 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. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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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 com.sun.crypto.provider;
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import jdk.internal.util.ArraysSupport;
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import java.io.ByteArrayOutputStream;
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import java.nio.ByteBuffer;
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import java.util.Arrays;
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import java.util.HexFormat;
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/**
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* This class extends ByteArrayOutputStream by optimizing internal buffering.
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* It skips bounds checking, as the buffers are known and input previously
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* checked. toByteArray() returns the internal buffer to avoid an extra copy.
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*
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* This uses `count` to determine the state of `buf`. `buf` can still
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* point to an array while `count` equals zero.
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*/
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final class AEADBufferedStream extends ByteArrayOutputStream {
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/**
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* Create an instance with the specified buffer
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*/
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public AEADBufferedStream(int len) {
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super(len);
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}
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/**
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* This method saves memory by returning the internal buffer. The calling
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* method must use {@code size()} for the relevant data length as the
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* returning byte[] maybe larger.
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*
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* @return internal buffer.
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*/
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public byte[] getBuffer() {
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return buf;
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}
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/**
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* This method with expand the buffer if {@code count} + {@code len}
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* is larger than the buffer byte[] length.
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* @param len length to add to the current buffer
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*/
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private void checkCapacity(int len) {
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int blen = buf.length;
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// Create a new larger buffer and append the new data
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if (blen < count + len) {
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buf = Arrays.copyOf(buf, ArraysSupport.newLength(blen, len, blen));
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}
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}
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/**
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* Takes a ByteBuffer writing non-blocksize data directly to the internal
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* buffer.
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* @param src remaining non-blocksize ByteBuffer
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*/
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public void write(ByteBuffer src) {
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int pos = src.position();
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int len = src.remaining();
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if (src.hasArray()) {
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write(src.array(), pos + src.arrayOffset(), len);
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src.position(pos + len);
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return;
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}
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checkCapacity(len);
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src.get(buf, count, len);
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count += len;
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}
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@Override
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public void write(byte[] in, int offset, int len) {
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checkCapacity(len);
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System.arraycopy(in, offset, buf, count, len);
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count += len;
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}
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@Override
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public String toString() {
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return (count == 0 ? "null" : HexFormat.of().formatHex(buf));
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}
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}
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