;**************************************
;*
;* lhs_UUID.pbi
;*
;* (c) by René Linder
;* (c) by Linder Hard- und Software
;*
;* Lizenz LGPL V2.1

Enumeration UUID_Version
  #UUID_V1
  #UUID_V2
  #UUID_V3
  #UUID_V4 ; Standard.
  #UUID_V5
EndEnumeration

Global UUID_CryptRandom.i

CompilerIf #PB_Compiler_OS = #PB_OS_Web
  UUID_CryptRandom = 0
CompilerElse
  If OpenCryptRandom()
    UUID_CryptRandom = 1
  Else
    UUID_CryptRandom = 0
  EndIf
CompilerEndIf

Procedure.s CreateUUID(Type.i=#UUID_V4, String.s="")
  ;[T] CreateUUID(Type.i, String.s="")
  ;[D] Gibt eine UUID des Entsprechenden Types  als String zurück.
  ;[D] Derzeit nur Version 4 Implementiert.
  ;[V] 0.0.1
  ;[M] 0.0.1   
  Protected P_Type.i = Type.i
  Protected P_String.s = String.s
  Protected P_UUID.s = ""
  Protected Dim P_Numbers.a(16)
  ;Protected P_Temp.a
  Protected P_Count.a
  Protected Key
 
  Structure Struc_UUID
   
    low.a
  EndStructure
 
  Select P_Type
;     Case #UUID_V1
;     
;     Case #UUID_V2
;     
;     Case #UUID_V3
;     
;     Case #UUID_V5
    Case 10
     
    Default     ;#UUID_V4 RFC 4122 Konform
                ;xx xx xx xx - xx xx - 4x xx - yx xx - xx xx xx xx xx xx
      Key = AllocateMemory(16)
      ;Key = 0
      CompilerIf #PB_Compiler_OS <> #PB_OS_Web
        If UUID_CryptRandom And Key
          CryptRandomData(Key, 16)
          For P_Count = 0 To 15
            P_Numbers(P_Count) = PeekB(Key+P_Count)
          Next P_Count     
        Else
      CompilerElse
        If UUID_CryptRandom = 0
      CompilerEndIf
        For P_Count = 0 To 15
          P_Numbers(P_Count) = Random(255)
        Next P_Count
      EndIf
     
      If Key
        FreeMemory(Key)
      EndIf
     
      P_Numbers(6) = Val("$4"+Right(RSet(Hex(P_Numbers(6), #PB_Byte), 2, "0"), 1))
      P_Numbers(8) = Val("%10"+Right(RSet(Bin(P_Numbers(8), #PB_Byte), 8, "0"), 6))
      P_UUID = ""
      For P_Count = 0 To 15
        If P_Count = 4 Or P_Count = 6 Or P_Count = 8 Or P_Count = 10
          P_UUID + "-"
        EndIf
        P_UUID + RSet(Hex(P_Numbers(P_Count), #PB_Byte), 2, "0")
      Next P_Count
     
  EndSelect
  ProcedureReturn P_UUID
EndProcedure

Procedure IsUUID(UUID.s , Type.i = #UUID_V4)
  ;[T] IsUUID(UUID.s , Type.i = #UUID_V4)
  ;[D] Prüft ob die UUID entsprechend Version 4 und RFC 4122 Konform ist.
  ;[V] 0.0.1
  ;[M] 0.0.1     
  If Mid(UUID.s, 15,1) = Str(Type+1)
    If Left(Bin(Val("$"+Mid(UUID.s, 15,2)), #PB_Byte),2) = "10"
      ProcedureReturn #True
    EndIf
  EndIf
 
  ProcedureReturn #False
EndProcedure