/* ====================================================================
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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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/// <summary>
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/// Adapts a plain byte array to <see cref="T:HH.WMS.Utils.NPOI.Util.ILittleEndianInput"/>
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/// </summary>
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/// <remarks>@author Josh Micich</remarks>
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public class LittleEndianByteArrayInputStream : ILittleEndianInput
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{
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private byte[] _buf;
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private int _endIndex;
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private int _ReadIndex;
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public LittleEndianByteArrayInputStream(byte[] buf, int startOffset, int maxReadLen)
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{
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_buf = buf;
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_ReadIndex = startOffset;
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_endIndex = startOffset + maxReadLen;
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}
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public LittleEndianByteArrayInputStream(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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public LittleEndianByteArrayInputStream(byte[] buf) :
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this(buf, 0, buf.Length)
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{
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}
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public int Available()
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{
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return _endIndex - _ReadIndex;
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}
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private void CheckPosition(int i)
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{
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if (i > _endIndex - _ReadIndex)
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{
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throw new RuntimeException("Buffer overrun");
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}
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}
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public int GetReadIndex()
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{
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return _ReadIndex;
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}
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public int ReadByte()
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{
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CheckPosition(1);
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return _buf[_ReadIndex++];
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}
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public int ReadInt()
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{
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CheckPosition(4);
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int i = _ReadIndex;
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int b0 = _buf[i++] & 0xFF;
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int b1 = _buf[i++] & 0xFF;
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int b2 = _buf[i++] & 0xFF;
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int b3 = _buf[i++] & 0xFF;
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_ReadIndex = i;
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return (b3 << 24) + (b2 << 16) + (b1 << 8) + (b0 << 0);
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}
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public long ReadLong()
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{
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CheckPosition(8);
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int i = _ReadIndex;
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int b0 = _buf[i++] & 0xFF;
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int b1 = _buf[i++] & 0xFF;
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int b2 = _buf[i++] & 0xFF;
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int b3 = _buf[i++] & 0xFF;
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int b4 = _buf[i++] & 0xFF;
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int b5 = _buf[i++] & 0xFF;
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int b6 = _buf[i++] & 0xFF;
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int b7 = _buf[i++] & 0xFF;
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_ReadIndex = i;
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return (((long)b7 << 56) +
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((long)b6 << 48) +
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((long)b5 << 40) +
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((long)b4 << 32) +
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((long)b3 << 24) +
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(b2 << 16) +
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(b1 << 8) +
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(b0 << 0));
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}
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public short ReadShort()
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{
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return (short)ReadUShort();
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}
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public int ReadUByte()
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{
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CheckPosition(1);
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return _buf[_ReadIndex++] & 0xFF;
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}
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public int ReadUShort()
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{
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CheckPosition(2);
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int i = _ReadIndex;
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int b0 = _buf[i++] & 0xFF;
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int b1 = _buf[i++] & 0xFF;
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_ReadIndex = i;
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return (b1 << 8) + (b0 << 0);
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}
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public void ReadFully(byte[] buf, int off, int len)
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{
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CheckPosition(len);
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System.Array.Copy(_buf, _ReadIndex, buf, off, len);
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_ReadIndex += len;
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}
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public void ReadFully(byte[] buf)
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{
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ReadFully(buf, 0, buf.Length);
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}
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public double ReadDouble()
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{
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return BitConverter.Int64BitsToDouble(ReadLong());
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}
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}
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}
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