/* ====================================================================
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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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/* ================================================================
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* About NPOI
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* Author: Tony Qu
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* Author's email: tonyqus (at) gmail.com
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* Author's Blog: tonyqus.wordpress.com.cn (wp.tonyqus.cn)
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* HomePage: http://www.codeplex.com/npoi
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* Contributors:
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*
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* ==============================================================*/
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using System;
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using System.Collections.Generic;
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using System.Text;
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namespace HH.WMS.Utils.NPOI.Util
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{
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/// <summary>
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/// Represents a class ID (16 bytes). Unlike other little-endian
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/// type the {@link ClassID} is not just 16 bytes stored in the wrong
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/// order. Instead, it is a double word (4 bytes) followed by two
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/// words (2 bytes each) followed by 8 bytes.
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/// @author Rainer Klute
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/// <a href="mailto:klute@rainer-klute.de">klute@rainer-klute.de</a>
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/// @version $Id: ClassID.java 489730 2006-12-22 19:18:16Z bayard $
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/// @since 2002-02-09
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/// </summary>
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public class ClassID
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{
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/**
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* The bytes making out the class ID in correct order,
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* i.e. big-endian.
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*/
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protected byte[] bytes;
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/// <summary>
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/// Creates a <see cref="ClassID"/> and Reads its value from a byte array.
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/// </summary>
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/// <param name="src">The byte array to Read from.</param>
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/// <param name="offset">The offset of the first byte to Read.</param>
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public ClassID(byte[] src, int offset)
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{
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Read(src, offset);
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}
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/// <summary>
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/// Creates a <see cref="ClassID"/> and initializes its value with 0x00 bytes.
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/// </summary>
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public ClassID()
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{
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bytes = new byte[LENGTH];
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for (int i = 0; i < LENGTH; i++)
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bytes[i] = 0x00;
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}
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/** The number of bytes occupied by this object in the byte
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* stream. */
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public static int LENGTH = 16;
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/// <summary>
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/// Gets the length.
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/// </summary>
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/// <value>The number of bytes occupied by this object in the byte stream.</value>
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public int Length
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{
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get { return LENGTH; }
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}
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/// <summary>
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/// Gets or sets the bytes making out the class ID. They are returned in correct order, i.e. big-endian.
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/// </summary>
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/// <value>the bytes making out the class ID..</value>
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public byte[] Bytes
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{
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get { return bytes; }
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set
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{
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for (int i = 0; i < this.bytes.Length; i++)
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this.bytes[i] = value[i];
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}
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}
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/// <summary>
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/// Reads the class ID's value from a byte array by turning little-endian into big-endian.
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/// </summary>
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/// <param name="src">The byte array to Read from</param>
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/// <param name="offset">The offset within the </param>
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/// <returns>A byte array containing the class ID.</returns>
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public byte[] Read(byte[] src, int offset)
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{
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bytes = new byte[16];
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/* Read double word. */
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bytes[0] = src[3 + offset];
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bytes[1] = src[2 + offset];
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bytes[2] = src[1 + offset];
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bytes[3] = src[0 + offset];
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/* Read first word. */
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bytes[4] = src[5 + offset];
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bytes[5] = src[4 + offset];
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/* Read second word. */
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bytes[6] = src[7 + offset];
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bytes[7] = src[6 + offset];
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/* Read 8 bytes. */
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for (int i = 8; i < 16; i++)
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bytes[i] = src[i + offset];
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return bytes;
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}
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/// <summary>
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/// Writes the class ID to a byte array in the little-endian format.
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/// </summary>
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/// <param name="dst">The byte array to Write to.</param>
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/// <param name="offset">The offset within the </param>
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public void Write(byte[] dst, int offset)
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{
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/* Check array size: */
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if (dst.Length < 16)
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throw new ArrayTypeMismatchException
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("Destination byte[] must have room for at least 16 bytes, " +
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"but has a length of only " + dst.Length + ".");
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/* Write double word. */
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dst[0 + offset] = bytes[3];
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dst[1 + offset] = bytes[2];
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dst[2 + offset] = bytes[1];
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dst[3 + offset] = bytes[0];
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/* Write first word. */
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dst[4 + offset] = bytes[5];
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dst[5 + offset] = bytes[4];
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/* Write second word. */
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dst[6 + offset] = bytes[7];
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dst[7 + offset] = bytes[6];
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/* Write 8 bytes. */
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for (int i = 8; i < 16; i++)
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dst[i + offset] = bytes[i];
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}
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/// <summary>
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/// Checks whether this ClassID is equal to another
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/// object.
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/// </summary>
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/// <param name="o">the object to compare this PropertySet with</param>
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/// <returns>true if the objects are equal, else
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/// false</returns>
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public override bool Equals(Object o)
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{
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if (o == null || !(o is ClassID))
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return false;
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ClassID cid = (ClassID) o;
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if (bytes.Length != cid.bytes.Length)
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return false;
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for (int i = 0; i < bytes.Length; i++)
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if (bytes[i] != cid.bytes[i])
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return false;
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return true;
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}
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/// <summary>
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/// Serves as a hash function for a particular type.
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/// </summary>
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/// <returns>
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/// A hash code for the current <see cref="T:System.Object"/>.
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/// </returns>
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public override int GetHashCode()
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{
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return Encoding.UTF8.GetString(bytes).GetHashCode();
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}
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/// <summary>
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/// Returns a human-Readable representation of the Class ID in standard
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/// format <c>"{xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx}"</c>.
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/// </summary>
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/// <returns>
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/// A String representation of the Class ID represented by this object..
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/// </returns>
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public override String ToString()
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{
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StringBuilder sbClassId = new StringBuilder(38);
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sbClassId.Append('{');
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for (int i = 0; i < 16; i++)
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{
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sbClassId.Append(HexDump.ToHex(bytes[i]));
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if (i == 3 || i == 5 || i == 7 || i == 9)
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sbClassId.Append('-');
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}
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sbClassId.Append('}');
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return sbClassId.ToString();
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}
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}
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}
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