delphi Base24编码解码
unit Base24Unt;
{Base24}
interface
const
EncodeTable: array[0..23] of Char ='BCDFGHJKMPQRTVWXY2346789' ;
DecodeTable: array[#0..#127] of Byte = (
25,25,25,25,25,25,25,25,
25,25,25,25,25,25,25,25,
25,25,25,25,25,25,25,25,
25,25,25,25,25,25,25,25,
25,25,25,25,25,25,25,25,
25,25,25,25,25,25,25,25,
25,25,17,18,19,25,20,21,
22,23,25,25,25,25,25,25,
25,25, 0, 1, 2,25, 3, 4,
5,25, 6, 7,25, 8,25,25,
9,10,11,25,12,25,13,14,
15,16,25,25,25,25,25,25,
25,25,25,25,25,25,25,25,
25,25,25,25,25,25,25,25,
25,25,25,25,25,25,25,25,
25,25,25,25,25,25,25,25);
function ByteToBase24(buf:array of byte):String;
function FormatBase24(sValue:String;Const bAdd:Boolean=False):String;
procedure Base24ToByte(sValue:String;var buf:array of byte);
implementation
function ByteToBase24(buf:array of byte):String;
var
i,j:Integer;
K:Longword;
begin
for i := 24 downto 0 do
begin
K := 0;
for j := High(buf) downto Low(buf) do
begin
K := (K * 256) + buf[j];
buf[j] := K div 24;
K := K mod 24;
end;
Result :=ConCat(EncodeTable[K],Result);
end;
end;
procedure Base24ToByte(sValue:String;var buf:array of byte);
var
i,j:Integer;
K:Longword;
begin
for i:=0 to 24 do
begin
k:=DecodeTable[sValue[i+1]];
for j:=0 to 14 do
begin
K:=buf[j]*24+K;
buf[j]:=K mod 256;
k:=K div 256;
end;
end;
end;
function FormatBase24(sValue:String;Const bAdd:Boolean=False):String;
var
i,n:Integer;
begin
Result:='';
n:=Length(sValue);
for i:=1 to n do
begin
if bAdd then
begin
if (i mod 5=0)and(i<>n) then
begin
Result:=ConCat(Result,sValue[i],'-');
continue;
end;
end else begin
if sValue[i]='-' then continue;
end;
Result:=ConCat(Result,sValue[i]);
end;
end;
end.
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