/* ====================================================================
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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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/// Wraps an <see cref="T:System.IO.Stream"/> providing <see cref="T:HH.WMS.Utils.NPOI.Util.ILittleEndianInput"/><p/>
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///
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/// This class does not buffer any input, so the stream Read position maintained
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/// by this class is consistent with that of the inner stream.
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/// </summary>
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/// <remarks>
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/// @author Josh Micich
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/// </remarks>
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public class LittleEndianInputStream : ILittleEndianInput
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{
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Stream in1 = null;
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public int Available()
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{
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return (int)(in1.Length - in1.Position);
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}
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public LittleEndianInputStream(Stream is1)
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{
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in1 = is1;
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}
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public int ReadByte()
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{
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return (byte)ReadUByte();
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}
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public int ReadUByte()
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{
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int ch;
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try
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{
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ch = in1.ReadByte();
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}
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catch (IOException e)
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{
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throw new RuntimeException(e);
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}
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CheckEOF(ch);
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return ch;
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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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public int ReadInt()
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{
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int ch1;
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int ch2;
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int ch3;
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int ch4;
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try
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{
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ch1 = in1.ReadByte();
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ch2 = in1.ReadByte();
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ch3 = in1.ReadByte();
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ch4 = in1.ReadByte();
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}
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catch (IOException e)
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{
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throw new RuntimeException(e);
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}
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CheckEOF(ch1 | ch2 | ch3 | ch4);
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return (ch4 << 24) + (ch3 << 16) + (ch2 << 8) + (ch1 << 0);
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}
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public long ReadLong()
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{
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int b0;
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int b1;
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int b2;
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int b3;
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int b4;
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int b5;
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int b6;
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int b7;
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try
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{
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b0 = in1.ReadByte();
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b1 = in1.ReadByte();
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b2 = in1.ReadByte();
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b3 = in1.ReadByte();
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b4 = in1.ReadByte();
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b5 = in1.ReadByte();
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b6 = in1.ReadByte();
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b7 = in1.ReadByte();
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}
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catch (IOException e)
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{
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throw new RuntimeException(e);
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}
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CheckEOF(b0 | b1 | b2 | b3 | b4 | b5 | b6 | b7);
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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 ReadUShort()
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{
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int ch1;
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int ch2;
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try
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{
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ch1 = in1.ReadByte();
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ch2 = in1.ReadByte();
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}
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catch (IOException e)
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{
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throw new RuntimeException(e);
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}
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CheckEOF(ch1 | ch2);
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return (ch2 << 8) + (ch1 << 0);
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}
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private static void CheckEOF(int value)
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{
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if (value < 0)
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{
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throw new RuntimeException("Unexpected end-of-file");
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}
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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 void ReadFully(byte[] buf, int off, int len)
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{
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int max = off + len;
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for (int i = off; i < max; i++)
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{
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byte ch;
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try
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{
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ch = (byte)in1.ReadByte();
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}
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catch (IOException e)
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{
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throw new RuntimeException(e);
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}
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CheckEOF(ch);
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buf[i] = ch;
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}
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}
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}
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}
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