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QbKey.cs
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QbKey.cs
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using System;
using System.Collections.Generic;
using System.Text;
using System.Text.RegularExpressions;
//using System.Runtime.InteropServices;
public class QbKey
{
///<summary>
/// initCRC32 --> Make the CRC table
///</summary>
static QbKey()
{
uint crc, poly;
int i, j;
poly = ((uint)0xEDB88320L);
for (i = 0; i < 256; (i)++)
{
crc = ((uint)i);
for (j = 8; j > 0; (j)--)
{
if ((crc & 1) == 1)
crc = crc >> 1 ^ poly;
else
crc >>= 1;
}
crc_tab[i] = crc;
}
}
private QbKey(uint crc)
{
_crc = crc;
_text = string.Empty;
}
private QbKey(uint crc, string text)
{
_crc = crc;
_text = text;
}
public static string FormatText(string text)
{
return text.Replace('/', '\\').ToLower();
}
public QbKey Clone()
{
if (this.HasText)
return QbKey.Create(this.Text);
else
return QbKey.Create(this.Crc);
}
///<summary>
/// Create a QbKey from a string, the string can be an ascii CRC
///</summary>
public static QbKey Create(string text)
{
string str = FormatText(text);
if (str == null)
//throw new ArgumentNullException("text"); no one cares
// treat like a blank string
return new QbKey(0xFFFFFFFF);
if (Regex.IsMatch(str, "^[0-9a-fA-F]{8}$"))
return new QbKey(uint.Parse(str, System.Globalization.NumberStyles.HexNumber));
//makeQBKey() -- make a QBKey (CRC32 ^ 0xFFFFFFFF (or CRC without final XOR) of a string)
uint crc;
int i;
int length;
length = str.Length;
crc = ((uint)0xFFFFFFFF);
for (i = 0; i < length; (i)++)
crc = crc >> 8 & 0x00FFFFFF ^ crc_tab[(crc ^ str[i]) & 0xFF];
return new QbKey(crc, text);
}
/// <summary>
/// Create a QbKey that does not have known text
/// </summary>
/// <param name="crc">QBKey crc</param>
/// <returns></returns>
public static QbKey Create(uint crc)
{
return new QbKey(crc);
}
/// <summary>
/// Create a QbKey that has an already known CRC and Text
/// </summary>
/// <param name="crc">QBKey crc</param>
/// <param name="text">Text from debug file etc</param>
/// <returns></returns>
public static QbKey Create(uint crc, string text)
{
QbKey qb = Create(text);
if (crc != qb.Crc)
throw new ArgumentException(string.Format("The Crc 0x{0} does not match the Text '{1}'", crc.ToString("X").PadLeft(8, '0'), text));
return qb;
}
public uint Crc
{
get { return _crc; }
}
public string Text
{
get { return _text; }
}
public override int GetHashCode()
{
return base.GetHashCode() & (int)this._crc; //Hmm
}
public bool HasText
{
get { return _text.Length != 0; }
}
public override string ToString()
{
if (!HasText)
return _crc.ToString("X").PadLeft(8, '0');
else
return _text;
}
public override bool Equals(object obj)
{
if (obj is QbKey)
return this.Crc == ((QbKey)obj).Crc;
else if (obj is uint)
return this.Crc == (uint)obj;
return false;
}
public static bool operator ==(QbKey qb1, uint qb2)
{
return (!object.Equals(qb1, null) && qb1.Crc == qb2);
}
public static bool operator !=(QbKey qb1, uint qb2)
{
return (!(qb1 == qb2));
}
public static bool operator ==(uint qb1, QbKey qb2)
{
return (qb2 == qb1);
}
public static bool operator !=(uint qb1, QbKey qb2)
{
return (!(qb2 == qb1));
}
public static bool operator ==(QbKey qb1, QbKey qb2)
{
bool isNull1 = object.Equals(qb1, null);
bool isNull2 = object.Equals(qb2, null);
return ((isNull1 && isNull2) || (!isNull1 && !isNull2 && qb1.Crc == qb2.Crc));
}
public static bool operator !=(QbKey qb1, QbKey qb2)
{
return (!(qb1 == qb2));
}
public static bool operator ==(QbKey key, string str)
{
bool isNull1 = object.Equals(key, null);
bool isNull2 = object.Equals(str, null);
return ((isNull1 && isNull2) || (!isNull1 && !isNull2 && key.Crc == Create(str).Crc));
}
public static bool operator !=(QbKey key, string str)
{
return (!(key == str));
}
private uint _crc;
private string _text;
///<summary>
/// crc_tab[] -- Array with the CRC table
///</summary>
private static uint[] crc_tab = new uint[256];
}