作者：woozhj
文件名：upload.inc
說明：支持中文的無組件文件上傳ASP函數，由于ASP不支持二進制寫入文件，所以存成文件時必須使用組件，本函數只提供截取上傳文件的數據，可以寫入到數據庫。

<SCRIPT RUNAT=SERVER LANGUAGE=VBSCRIPT>
Function GetUpload(FormData)
Dim DataStart,DivStr,DivLen,DataSize,FormFieldData
'分隔標志串(+CRLF)
DivStr = LeftB(FormData,InStrB(FormData,str2bin(VbCrLf)) + 1)
'分隔標志串長度
DivLen = LenB(DivStr)
PosOpenBoundary = InStrB(FormData,DivStr)
PosCloseBoundary = InStrB(PosOpenBoundary + 1,FormData,DivStr)
Set Fields = CreateObject("Scripting.Dictionary")
 
While PosOpenBoundary > 0 And PosCloseBoundary > 0
 'name起始位置(name="xxxxx")，加6是因為[name="]長度為6
 FieldNameStart = InStrB(PosOpenBoundary,FormData,str2bin("name=")) + 6
 FieldNameSize = InStrB(FieldNameStart,FormData,ChrB(34)) - FieldNameStart '(")的ASC值=34
 FormFieldName = bin2str(MidB(FormData,FieldNameStart,FieldNameSize))
 
 'filename起始位置(filename="xxxxx")
 FieldFileNameStart = InStrB(PosOpenBoundary,FormData,str2bin("filename=")) + 10
 If FieldFileNameStart < PosCloseBoundary And FieldFileNameStart > PosopenBoundary Then
FieldFileNameSize = InStrB(FieldFileNameStart,FormData,ChrB(34)) - FieldFileNameStart '(")的ASC值=34
FormFileName = bin2str(MidB(FormData,FieldFileNameStart,FieldFileNameSize))
 Else
FormFileName = ""
 End If
 
 'Content-Type起始位置(Content-Type: xxxxx)
 FieldFileCTStart = InStrB(PosOpenBoundary,FormData,str2bin("Content-Type:")) + 14
 If FieldFileCTStart < PosCloseBoundaryAnd FieldFileCTStart > PosOpenBoundary Then
FieldFileCTSize = InStrB(FieldFileCTStart,FormData,str2bin(VbCrLf & VbCrLf)) - FieldFileCTStart
FormFileCT = bin2str(MidB(FormData,FieldFileCTStart,FieldFileCTSize))
 Else
FormFileCT = ""
 End If
 
 '數據起始位置：2個CRLF開始
 DataStart = InStrB(PosOpenBoundary,FormData,str2bin(VbCrLf & VbCrLf)) + 4
 If FormFileName <> "" Then
'數據長度，減1是因為數據文件的存取字節數問題(可能是AppendChunk方法的問題)：
'由于字節數為奇數的圖象存到數據庫時會去掉最后一個字符導致圖象不能正確顯示,
'字節數為偶數的數據文件就不會出現這個問題，因此必須保持字節數為偶數。
DataSize = InStrB(DataStart,FormData,DivStr) - DataStart - 1
FormFieldData = MidB(FormData,DataStart,DataSize)
 Else
'數據長度，減2是因為分隔標志串前有一個CRLF
DataSize = InStrB(DataStart,FormData,DivStr) - DataStart - 2
FormFieldData = bin2str(MidB(FormData,DataStart,DataSize))
 End If

 '建立一個Dictionary集存儲Form中各個Field的相關數據
 Set Field = CreateUploadField()
 Field.Name = FormFieldName
 Field.FilePath = FormFileName
 Field.FileName = GetFileName(FormFileName)
 Field.ContentType = FormFileCT
 Field.Length = LenB(FormFieldData)
 Field.Value = FormFieldData
 
 Fields.Add FormFieldName, Field
 
 PosOpenBoundary = PosCloseBoundary
 PosCloseBoundary = InStrB(PosOpenBoundary + 1,FormData,DivStr)
Wend
Set GetUpload = Fields
End Function

'把二進制字符串轉換成普通字符串函數
Function bin2str(binstr)
 Dim varlen,clow,ccc,skipflag
 '中文字符Skip標志
 skipflag=0
 ccc = ""
 If Not IsNull(binstr) Then
varlen=LenB(binstr)
For i=1 To varlen
If skipflag=0 Then
 clow = MidB(binstr,i,1)
 '判斷是否中文的字符
 If AscB(clow) > 127 Then
'AscW會把二進制的中文雙字節字符高位和低位反轉，所以要先把中文的高低位反轉
ccc =ccc & Chr(AscW(MidB(binstr,i+1,1) & clow))
skipflag=1
 Else
ccc = ccc & Chr(AscB(clow))
 End If
Else
 skipflag=0
End If
Next
 End If
 bin2str = ccc
End Function


'把普通字符串轉成二進制字符串函數
Function str2bin(varstr)
 str2bin=""
 For i=1 To Len(varstr)
 varchar=mid(varstr,i,1)
 varasc = Asc(varchar)
 ' asc對中文字符求出來的值可能為負數，
 ' 加上65536就可求出它的無符號數值
 ' -1在機器內是用補碼表示的0xffff,
 ' 其無符號值為65535,65535=-1+65536
 ' 其他負數依次類推。
 If varasc<0 Then
varasc = varasc + 65535
 End If
 '對中文的處理：把雙字節低位和高位分開
 If varasc>255 Then
varlow = Left(Hex(Asc(varchar)),2)
varhigh = right(Hex(Asc(varchar)),2)
str2bin = str2bin & chrB("&H" & varlow) & chrB("&H" & varhigh)
 Else
str2bin = str2bin & chrB(AscB(varchar))
 End If
 Next
End Function

'取得文件名(去掉Path)
Function GetFileName(FullPath)
 If FullPath <> "" Then
FullPath = StrReverse(FullPath)
FullPath = Left(FullPath, InStr(1, FullPath, "\") - 1)
GetFileName = StrReverse(FullPath)
 Else
GetFileName = ""
 End If
End Function
</SCRIPT>
<SCRIPT RUNAT=SERVER LANGUAGE=JSCRIPT>
function CreateUploadField(){ return new uf_Init() }
function uf_Init(){
this.Name = null
this.FileName = null
this.FilePath = null
this.ContentType = null
this.Value = null
this.Length = null
}
</SCRIPT>