VB里另一种更高效的Base64编码与解码算法
Option Explicit
'名称: Base64编码/解码模块
'Name: Base64 Encode & Decode Module
'作者: KiteGirl [中国]
'programmer: KiteGirl [China]
Private priBitMoveTable() As Byte '移位缓冲表
Private priBitMoveTable_CellReady() As Boolean '移位缓冲表标志表
Private priBitMoveTable_Create As Boolean '移位缓冲表创建标志
Private priEncodeTable() As Byte '编码表（素码转Base64）
Private priEncodeTable_Create As Boolean
Private priDecodeTable() As Byte '解码表（Base64转素码）
Private priDecodeTable_Create As Boolean
Private Declare Sub Base64_CopyMemory Lib "kernel32" Alias "RtlMoveMemory" (ByRef pDestination As Any, ByRef pSource As Any, ByVal pLength As Long)
Private Const conBase64_CodeTableStrng As String = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"
Private Const conBase64_PatchCode As Byte = 61
Private Type tpBase64_Dollop2438 '24Bit(8Bit*3Byte)数据块
btBytes(0 To 2) As Byte
End Type
Private Type tpBase64_Dollop2446 '24Bit(6Bit*4Byte)数据块
btBytes(0 To 3) As Byte
End Type
'解码
Public Sub Base64_Decode(ByRef tOutBytes() As Byte, ByRef pBytes() As Byte, Optional ByVal pPatchCode As Byte = conBase64_PatchCode)
'Base64Decode函数
'语法：[tOutBytes()] = Base64Decode(pBytes(), [pPatchCode])
'功能：将Byte数组表示的Base64编码Ascii字节数组解码为Byte字节数组，并返回。
'参数：byte pBytes() '必要参数。Byte数组表示的Base64编码数据。
' byte pPatchCode '可选参数。冗余字节追加码。默认为61（"="的Ascii码）
'返回：byte tOutBytes() 'Byte数组。
'示例：
' Dim tSurString As String
' Dim tSurBytes() As Byte
' tSurString = "S2l0ZUdpcmzKx7j2usO6otfT"
' tSurBytes() = StrConv(tSurString, vbfromUnicode)
' Dim tDesString As String
' Dim tDesBytes() As Byte
' tDesBytes() = Base64Decode(tSurBy
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