asp中常用的字符串安全处理函数集合(过滤特殊字符等)

　　复制代码 代码如下:
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转换内容，防止意外
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Function Content_Encode(ByVal t0)
IF IsNull(t0) Or Len(t0)=0 Then
Content_Encode=
Else
Content_Encode=Replace(t0,<,<)
Content_Encode=Replace(Content_Encode,>,>)
End IF
End Function

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反转换内容
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Function Content_Decode(ByVal t0)
IF IsNull(t0) Or Len(t0)=0 Then
Content_Decode=
Else
Content_Decode=Replace(t0,<,<)
Content_Decode=Replace(Content_Decode,>,>)
End IF
End Function

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过滤字符
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Function FilterText(ByVal t0,ByVal t1)
IF Len(t0)=0 Or IsNull(t0) Or IsArray(t0) Then FilterText=:Exit Function
t0=Trim(t0)
Select Case t1
Case 1
t0=Replace(t0,Chr(32),)
t0=Replace(t0,Chr(13),)
t0=Replace(t0,Chr(10)&Chr(10),<br>)
t0=Replace(t0,Chr(10),<br>)
Case 2
t0=Replace(t0,Chr(8),)回格
t0=Replace(t0,Chr(9),)tab(水平制表符)
t0=Replace(t0,Chr(10),)换行
t0=Replace(t0,Chr(11),)tab(垂直制表符)
t0=Replace(t0,Chr(12),)换页
t0=Replace(t0,Chr(13),)回车 chr(13)&chr(10) 回车和换行的组合
t0=Replace(t0,Chr(22),)
t0=Replace(t0,Chr(32),)空格 SPACE
t0=Replace(t0,Chr(33),)!
t0=Replace(t0,Chr(34),)
t0=Replace(t0,Chr(35),)#
t0=Replace(t0,Chr(36),)$
t0=Replace(t0,Chr(37),)%
t0=Replace(t0,Chr(38),)&
t0=Replace(t0,Chr(39),)
t0=Replace(t0,Chr(40),)(
t0=Replace(t0,Chr(41),))
t0=Replace(t0,Chr(42),)*
t0=Replace(t0,Chr(43),)+
t0=Replace(t0,Chr(44),),
t0=Replace(t0,Chr(45),)-
t0=Replace(t0,Chr(46),).
t0=Replace(t0,Chr(47),)/
t0=Replace(t0,Chr(58),):
t0=Replace(t0,Chr(59),);
t0=Replace(t0,Chr(60),)<
t0=Replace(t0,Chr(61),)=
t0=Replace(t0,Chr(62),)>
t0=Replace(t0,Chr(63),)?
t0=Replace(t0,Chr(64),)@
t0=Replace(t0,Chr(91),)\
t0=Replace(t0,Chr(92),)\
t0=Replace(t0,Chr(93),)]
t0=Replace(t0,Chr(94),)^
t0=Replace(t0,Chr(95),)_
t0=Replace(t0,Chr(96),)`
t0=Replace(t0,Chr(123),){
t0=Replace(t0,Chr(124),)
t0=Replace(t0,Chr(125),)}
t0=Replace(t0,Chr(126),)~
Case Else
t0=Replace(t0, &, )
t0=Replace(t0, , ')
t0=Replace(t0, , ")
t0=Replace(t0, <, <)
t0=Replace(t0, >, >)
End Select
IF Instr(Lcase(t0),expression)>0 Then
t0=Replace(t0,expression,e­xpression, 1, -1, 0)
End If
FilterText=t0
End Function

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过滤常见字符及Html
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Function FilterHtml(ByVal t0)
IF Len(t0)=0 Or IsNull(t0) Or IsArray(t0) Then FilterHtml=:Exit Function
IF Len(Sdcms_Badhtml)>0 Then t0=ReplaceText(t0,<(\/)(&Sdcms_Badhtml&), <$1$2)
IF Len(Sdcms_BadEvent)>0 Then t0=ReplaceText(t0,<(.[^>]*)(&Sdcms_BadEvent&), <$1$2)
t0=FilterText(t0,0)
FilterHtml=t0
End Function

Function GotTopic(ByVal t0,ByVal t1)
IF Len(t0)=0 Or IsNull(t0) Then
GotTopic=
Exit Function
End IF
Dim l,t,c, i
t0=Replace(Replace(Replace(Replace(t0,, ),",chr(34)),>,>),<,<)
l=Len(t0)
t=0
For I=1 To l
c=Abs(Asc(Mid(t0,i,1)))
IF c>255 Then t=t+2 Else t=t+1
IF t>=t1 Then
gotTopic=Left(t0,I)&…
Exit For
Else
GotTopic=t0
End IF
Next
GotTopic=Replace(Replace(Replace(Replace(GotTopic, ,),chr(34),"),>,>),<,<)
End Function

Function UrlDecode(ByVal t0)
Dim t1,t2,t3,i,t4,t5,t6
t1=
t2=False
t3=
For I=1 To Len(t0)
t4=Mid(t0,I,1)
IF t4=+ Then
t1=t1&
ElseIF t4=% Then
t5=Mid(t0,i+1,2)
t6=Cint(&H & t5)
IF t2 Then
t2=False
t1=t1&Chr(Cint(&H&t3&t5))
Else
IF Abs(t6)<=127 then
t1=t1&Chr(t6)
Else
t2=True
t3=t5
End IF
End IF
I=I+2
Else
t1=t1&t4
End IF
Next
UrlDecode=t1
End Function

Function CutStr(byVal t0,byVal t1)
Dim l,t,c,i
IF IsNull(t0) Then CutStr=:Exit Function
l=Len(t0)
t1=Int(t1)
t=0
For I=1 To l
c=Asc(Mid(t0,I,1))
IF c<0 Or c>255 Then t=t+2 Else t=t+1
IF t>=t1 Then
CutStr=Left(t0,I)&...
Exit For
Else
CutStr=t0
End IF
Next
End Function

Function CloseHtml(ByVal t0)
Dim t1,I,t2,t3,Regs,Matches,J,Match
Set Regs=New RegExp
Regs.IgnoreCase=True
Regs.Global=True
t1=Array(p,div,span,table,ul,font,b,u,i,h1,h2,h3,h4,h5,h6)
For I=0 To UBound(t1)
t2=0
t3=0
Regs.Pattern=\<&t1(I)&( [^\<\>]+)\>
Set Matches=Regs.Execute(t0)
For Each Match In Matches
t2=t2+1
Next
Regs.Pattern=\</&t1(I)&\>
Set Matches=Regs.Execute(t0)
For Each Match In Matches
t3=t3+1
Next
For j=1 To t2-t3
t0=t0+</&t1(I)&>
Next
Next
CloseHtml=t0
End Function