| /* ==================================================================== |
| 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.poi.util; |
| |
| import java.io.OutputStream; |
| |
| /** |
| * Adapts a plain byte array to {@link LittleEndianOutput} |
| */ |
| public final class LittleEndianByteArrayOutputStream extends OutputStream implements LittleEndianOutput, DelayableLittleEndianOutput { |
| private final byte[] _buf; |
| private final int _endIndex; |
| private int _writeIndex; |
| |
| public LittleEndianByteArrayOutputStream(byte[] buf, int startOffset, int maxWriteLen) { // NOSONAR |
| if (startOffset < 0 || startOffset > buf.length) { |
| throw new IllegalArgumentException("Specified startOffset (" + startOffset |
| + ") is out of allowable range (0.." + buf.length + ")"); |
| } |
| _buf = buf; |
| _writeIndex = startOffset; |
| _endIndex = startOffset + maxWriteLen; |
| if (_endIndex < startOffset || _endIndex > buf.length) { |
| throw new IllegalArgumentException("calculated end index (" + _endIndex |
| + ") is out of allowable range (" + _writeIndex + ".." + buf.length + ")"); |
| } |
| } |
| public LittleEndianByteArrayOutputStream(byte[] buf, int startOffset) { |
| this(buf, startOffset, buf.length - startOffset); |
| } |
| |
| private void checkPosition(int i) { |
| if (i > _endIndex - _writeIndex) { |
| throw new RuntimeException("Buffer overrun"); |
| } |
| } |
| |
| @Override |
| public void writeByte(int v) { |
| checkPosition(1); |
| _buf[_writeIndex++] = (byte)v; |
| } |
| |
| @Override |
| public void writeDouble(double v) { |
| writeLong(Double.doubleToLongBits(v)); |
| } |
| |
| @Override |
| public void writeInt(int v) { |
| checkPosition(4); |
| int i = _writeIndex; |
| _buf[i++] = (byte)((v >>> 0) & 0xFF); |
| _buf[i++] = (byte)((v >>> 8) & 0xFF); |
| _buf[i++] = (byte)((v >>> 16) & 0xFF); |
| _buf[i++] = (byte)((v >>> 24) & 0xFF); |
| _writeIndex = i; |
| } |
| |
| @Override |
| public void writeLong(long v) { |
| writeInt((int)(v >> 0)); |
| writeInt((int)(v >> 32)); |
| } |
| |
| @Override |
| public void writeShort(int v) { |
| checkPosition(2); |
| int i = _writeIndex; |
| _buf[i++] = (byte)((v >>> 0) & 0xFF); |
| _buf[i++] = (byte)((v >>> 8) & 0xFF); |
| _writeIndex = i; |
| } |
| |
| @Override |
| public void write(int b) { |
| writeByte(b); |
| } |
| |
| @Override |
| public void write(byte[] b) { |
| int len = b.length; |
| checkPosition(len); |
| System.arraycopy(b, 0, _buf, _writeIndex, len); |
| _writeIndex += len; |
| } |
| |
| @Override |
| public void write(byte[] b, int offset, int len) { |
| checkPosition(len); |
| System.arraycopy(b, offset, _buf, _writeIndex, len); |
| _writeIndex += len; |
| } |
| |
| public int getWriteIndex() { |
| return _writeIndex; |
| } |
| |
| @Override |
| public LittleEndianOutput createDelayedOutput(int size) { |
| checkPosition(size); |
| LittleEndianOutput result = new LittleEndianByteArrayOutputStream(_buf, _writeIndex, size); |
| _writeIndex += size; |
| return result; |
| } |
| } |