/* ====================================================================
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Licensed to the Apache Software Foundation (ASF) under one or more
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contributor license agreements. See the NOTICE file distributed with
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this work for additional information regarding copyright ownership.
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The ASF licenses this file to You under the Apache License, Version 2.0
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(the "License"); you may not use this file except in compliance with
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the License. You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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==================================================================== */
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namespace HH.WMS.Utils.NPOI.Util
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{
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using System;
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using System.IO;
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using System.Globalization;
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/// <summary>
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/// Adapts a plain byte array to <see cref="T:HH.WMS.Utils.NPOI.Util.ILittleEndianOutput"/>
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/// </summary>
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/// <remarks>@author Josh Micich</remarks>
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public class LittleEndianByteArrayOutputStream : ILittleEndianOutput, IDelayableLittleEndianOutput
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{
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private byte[] _buf;
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private int _endIndex;
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private int _writeIndex;
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public LittleEndianByteArrayOutputStream(byte[] buf, int startOffset, int maxWriteLen)
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{
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if (startOffset < 0 || startOffset > buf.Length)
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{
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throw new ArgumentException("Specified startOffset (" + startOffset
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+ ") is out of allowable range (0.." + buf.Length + ")");
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}
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_buf = buf;
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_writeIndex = startOffset;
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_endIndex = startOffset + maxWriteLen;
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if (_endIndex < startOffset || _endIndex > buf.Length)
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{
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throw new ArgumentException("calculated end index (" + _endIndex
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+ ") is out of allowable range (" + _writeIndex + ".." + buf.Length + ")");
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}
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}
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public LittleEndianByteArrayOutputStream(byte[] buf, int startOffset) :
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this(buf, startOffset, buf.Length - startOffset)
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{
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}
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private void CheckPosition(int i)
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{
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if (i > _endIndex - _writeIndex)
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{
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throw new RuntimeException(string.Format(CultureInfo.InvariantCulture, "Buffer overrun i={0};endIndex={1};writeIndex={2}", i, _endIndex, _writeIndex));
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}
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}
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public void WriteByte(int v)
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{
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CheckPosition(1);
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_buf[_writeIndex++] = (byte)v;
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}
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public void WriteDouble(double v)
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{
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WriteLong(BitConverter.DoubleToInt64Bits(v));
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}
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public void WriteInt(int v)
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{
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CheckPosition(4);
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int i = _writeIndex;
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_buf[i++] = (byte)((v >> 0) & 0xFF);
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_buf[i++] = (byte)((v >> 8) & 0xFF);
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_buf[i++] = (byte)((v >> 16) & 0xFF);
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_buf[i++] = (byte)((v >> 24) & 0xFF);
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_writeIndex = i;
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}
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public void WriteLong(long v)
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{
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WriteInt((int)(v >> 0));
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WriteInt((int)(v >> 32));
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}
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public void WriteShort(int v)
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{
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CheckPosition(2);
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int i = _writeIndex;
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_buf[i++] = (byte)((v >> 0) & 0xFF);
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_buf[i++] = (byte)((v >> 8) & 0xFF);
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_writeIndex = i;
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}
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public void Write(byte[] b)
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{
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int len = b.Length;
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CheckPosition(len);
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System.Array.Copy(b, 0, _buf, _writeIndex, len);
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_writeIndex += len;
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}
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public void Write(byte[] b, int offset, int len)
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{
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CheckPosition(len);
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System.Array.Copy(b, offset, _buf, _writeIndex, len);
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_writeIndex += len;
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}
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public int WriteIndex
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{
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get
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{
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return _writeIndex;
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}
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}
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public ILittleEndianOutput CreateDelayedOutput(int size)
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{
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CheckPosition(size);
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ILittleEndianOutput result = new LittleEndianByteArrayOutputStream(_buf, _writeIndex, size);
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_writeIndex += size;
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return result;
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}
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}
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}
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