caseinsensitivecomparer.cls

这是一个在vb下实现的各种加密程序,可以实现一般的文本加密和文件加密,但是很多算法都是已经被人破解过的.

VERSION 1.0 CLASS
BEGIN
  MultiUse = -1  'True
  Persistable = 1  'Persistable
  DataBindingBehavior = 0  'vbNone
  DataSourceBehavior  = 0  'vbNone
  MTSTransactionMode  = 0  'NotAnMTSObject
END
Attribute VB_Name = "CaseInsensitiveComparer"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = True
Attribute VB_PredeclaredId = False
Attribute VB_Exposed = True
'    CopyRight (c) 2004 Kelly Ethridge
'
'    This file is part of VBCorLib.
'
'    VBCorLib is free software; you can redistribute it and/or modify
'    it under the terms of the GNU Library General Public License as published by
'    the Free Software Foundation; either version 2.1 of the License, or
'    (at your option) any later version.
'
'    VBCorLib is distributed in the hope that it will be useful,
'    but WITHOUT ANY WARRANTY; without even the implied warranty of
'    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
'    GNU Library General Public License for more details.
'
'    You should have received a copy of the GNU Library General Public License
'    along with Foobar; if not, write to the Free Software
'    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
'
'    Module: CaseInsensitiveComparer
'

''
' Provides a comparer that is case-insensitive when comparing strings.
'
Option Explicit
Implements IObject
Implements IComparer

Private mDefault As IComparer

''
' Returns the comparison between two values.
'
' @param x The left-hand-side of the equation.
' @param y the right-hand-side of the equation.
' @return The relationship between the values.<br>
' Relationship guide:<br>
' x is equal to y returns 0.<br>
' x is greater than y returns a positive value (1).<br>
' x is less than y returns a negative value (-1).
'
Public Function Compare(ByRef x As Variant, ByRef y As Variant) As Long
    Compare = IComparer_Compare(x, y)
End Function

''
' Returns a string representation of this object instance.
'
' @return String representing this instance.
'
Public Function ToString() As String
    ToString = Object.ToString(Me, App)
End Function

''
' Returns a boolean indicating if the value and this object
' instance are the same instance.
'
' @param value The value to compare equalit to.
' @return Boolean indicating equality.
'
Public Function Equals(ByRef Value As Variant) As Boolean
    Equals = Object.Equals(Me, Value)
End Function

''
' Returns a pseudo-unique number identifying this instance.
'
' @return Pseudo-unique number identifying this instance.
'
Public Function GetHashCode() As Long
    GetHashCode = ObjPtr(CUnk(Me))
End Function


'''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
'   Class Events
'''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
Private Sub Class_Initialize()
    Set mDefault = Comparer.Default
End Sub


'''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
'   IObject Interface
'''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
Private Function IObject_Equals(Value As Variant) As Boolean
    IObject_Equals = Equals(Value)
End Function

Private Function IObject_GetHashcode() As Long
    IObject_GetHashcode = GetHashCode
End Function

Private Function IObject_ToString() As String
    IObject_ToString = ToString
End Function


'''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
'   IComparer Interface
'''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
' We put the main logic here since 99.99% of the time this object
' will be called through the IComparer interface.
Private Function IComparer_Compare(x As Variant, y As Variant) As Long
    If VarType(x) = vbString Then
        If VarType(y) = vbString Then
            IComparer_Compare = StrComp(x, y, vbTextCompare)
            Exit Function
        End If
    End If
    IComparer_Compare = mDefault.Compare(x, y)
End Function