| /** |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| * |
| */ |
| package org.apache.kerby.xdr.type; |
| |
| import org.apache.kerby.xdr.XdrDataType; |
| |
| import java.io.IOException; |
| import java.nio.ByteBuffer; |
| |
| /* |
| * From RFC 4506 : |
| * |
| * 0 1 2 3 4 5 ... |
| * +-----+-----+-----+-----+-----+-----+...+-----+-----+...+-----+ |
| * | length n |byte0|byte1|...| n-1 | 0 |...| 0 | |
| * +-----+-----+-----+-----+-----+-----+...+-----+-----+...+-----+ |
| * |<-------4 bytes------->|<------n bytes------>|<---r bytes--->| |
| * |<----n+r (where (n+r) mod 4 = 0)---->| |
| * VARIABLE-LENGTH OPAQUE |
| */ |
| |
| public class XdrBytes extends XdrSimple<byte[]> { |
| private int padding; |
| |
| public XdrBytes() { |
| this(null); |
| } |
| |
| public XdrBytes(byte[] value) { |
| super(XdrDataType.BYTES, value); |
| } |
| |
| @Override |
| protected void toValue() throws IOException { |
| byte[] bytes = getBytes(); |
| byte[] header = new byte[4]; |
| System.arraycopy(bytes, 0, header, 0, 4); |
| int byteArrayLen = ByteBuffer.wrap(header).getInt(); |
| int paddingBytes = (4 - (byteArrayLen % 4)) % 4; |
| validatePaddingBytes(paddingBytes); |
| setPadding(paddingBytes); |
| |
| if (bytes.length != byteArrayLen + 4 + paddingBytes) { |
| int totalLength = byteArrayLen + 4 + paddingBytes; |
| byte[] resetBytes = ByteBuffer.allocate(totalLength) |
| .put(getBytes(), 0, totalLength).array(); |
| /**reset bytes in case the enum type is in a struct or union*/ |
| setBytes(resetBytes); |
| } |
| |
| byte[] content = new byte[byteArrayLen]; |
| if (bytes.length > 1) { |
| System.arraycopy(bytes, 4, content, 0, byteArrayLen); |
| } |
| setValue(content); |
| } |
| |
| @Override |
| protected int encodingBodyLength() throws IOException { |
| if (getValue() != null) { |
| padding = (4 - getValue().length % 4) % 4; |
| return getValue().length + padding + 4; |
| } |
| return 0; |
| } |
| |
| @Override |
| protected void toBytes() throws IOException { |
| if (getValue() != null) { |
| byte[] bytes = new byte[encodingBodyLength()]; |
| int length = getValue().length; |
| bytes[0] = (byte) (length >> 24); |
| bytes[1] = (byte) (length >> 16); |
| bytes[2] = (byte) (length >> 8); |
| bytes[3] = (byte) (length); |
| System.arraycopy(getValue(), 0, bytes, 4, length); |
| setBytes(bytes); |
| } |
| } |
| |
| public void setPadding(int padding) { |
| this.padding = padding; |
| } |
| |
| public int getPadding() { |
| return padding; |
| } |
| |
| private void validatePaddingBytes(int paddingBytes) throws IOException { |
| if (paddingBytes < 0 || paddingBytes > 3) { |
| throw new IOException("Bad padding number: " + paddingBytes + ", should be in [0, 3]"); |
| } |
| } |
| } |