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DCPbase64.pas
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{******************************************************************************}
{* DCPcrypt v2.0 written by David Barton (crypto@cityinthesky.co.uk) **********}
{******************************************************************************}
{* A Base64 encoding/decoding unit ********************************************}
{******************************************************************************}
{* Copyright (c) 1999-2002 David Barton *}
{* Permission is hereby granted, free of charge, to any person obtaining a *}
{* copy of this software and associated documentation files (the "Software"), *}
{* to deal in the Software without restriction, including without limitation *}
{* the rights to use, copy, modify, merge, publish, distribute, sublicense, *}
{* and/or sell copies of the Software, and to permit persons to whom the *}
{* Software is furnished to do so, subject to the following conditions: *}
{* *}
{* The above copyright notice and this permission notice shall be included in *}
{* all copies or substantial portions of the Software. *}
{* *}
{* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR *}
{* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, *}
{* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL *}
{* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER *}
{* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING *}
{* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER *}
{* DEALINGS IN THE SOFTWARE. *}
{******************************************************************************}
unit DCPbase64;
interface
uses
Sysutils;
function Base64EncodeStr(const Value: string): string;
{ Encode a string into Base64 format }
function Base64DecodeStr(const Value: string): string;
{ Decode a Base64 format string }
function Base64Encode(pInput: pointer; pOutput: pointer; Size: longint): longint;
{ Encode a lump of raw data (output is (4/3) times bigger than input) }
function Base64Decode(pInput: pointer; pOutput: pointer; Size: longint): longint;
{ Decode a lump of raw data }
{******************************************************************************}
{******************************************************************************}
implementation
{$Q-}{$R-}
const
B64: array[0..63] of byte= (65,66,67,68,69,70,71,72,73,74,75,76,77,78,79,80,
81,82,83,84,85,86,87,88,89,90,97,98,99,100,101,102,103,104,105,106,107,108,
109,110,111,112,113,114,115,116,117,118,119,120,121,122,48,49,50,51,52,53,
54,55,56,57,43,47);
function Base64Encode(pInput: pointer; pOutput: pointer; Size: longint): longint;
var
i, iptr, optr: integer;
Input, Output: PByteArray;
begin
Input:= PByteArray(pInput); Output:= PByteArray(pOutput);
iptr:= 0; optr:= 0;
for i:= 1 to (Size div 3) do
begin
Output^[optr+0]:= B64[Input^[iptr] shr 2];
Output^[optr+1]:= B64[((Input^[iptr] and 3) shl 4) + (Input^[iptr+1] shr 4)];
Output^[optr+2]:= B64[((Input^[iptr+1] and 15) shl 2) + (Input^[iptr+2] shr 6)];
Output^[optr+3]:= B64[Input^[iptr+2] and 63];
Inc(optr,4); Inc(iptr,3);
end;
case (Size mod 3) of
1: begin
Output^[optr+0]:= B64[Input^[iptr] shr 2];
Output^[optr+1]:= B64[(Input^[iptr] and 3) shl 4];
Output^[optr+2]:= byte('=');
Output^[optr+3]:= byte('=');
end;
2: begin
Output^[optr+0]:= B64[Input^[iptr] shr 2];
Output^[optr+1]:= B64[((Input^[iptr] and 3) shl 4) + (Input^[iptr+1] shr 4)];
Output^[optr+2]:= B64[(Input^[iptr+1] and 15) shl 2];
Output^[optr+3]:= byte('=');
end;
end;
Result:= ((Size+2) div 3) * 4;
end;
function Base64EncodeStr(const Value: string): string;
begin
SetLength(Result,((Length(Value)+2) div 3) * 4);
Base64Encode(@Value[1],@Result[1],Length(Value));
end;
function Base64Decode(pInput: pointer; pOutput: pointer; Size: longint): longint;
var
i, j, iptr, optr: integer;
Temp: array[0..3] of byte;
Input, Output: PByteArray;
begin
Input:= PByteArray(pInput); Output:= PByteArray(pOutput);
iptr:= 0; optr:= 0;
Result:= 0;
for i:= 1 to (Size div 4) do
begin
for j:= 0 to 3 do
begin
case Input^[iptr] of
65..90 : Temp[j]:= Input^[iptr] - Ord('A');
97..122: Temp[j]:= Input^[iptr] - Ord('a') + 26;
48..57 : Temp[j]:= Input^[iptr] - Ord('0') + 52;
43 : Temp[j]:= 62;
47 : Temp[j]:= 63;
61 : Temp[j]:= $FF;
end;
Inc(iptr);
end;
Output^[optr]:= (Temp[0] shl 2) or (Temp[1] shr 4);
Result:= optr+1;
if (Temp[2]<> $FF) and (Temp[3]= $FF) then
begin
Output^[optr+1]:= (Temp[1] shl 4) or (Temp[2] shr 2);
Result:= optr+2;
Inc(optr)
end
else if (Temp[2]<> $FF) then
begin
Output^[optr+1]:= (Temp[1] shl 4) or (Temp[2] shr 2);
Output^[optr+2]:= (Temp[2] shl 6) or Temp[3];
Result:= optr+3;
Inc(optr,2);
end;
Inc(optr);
end;
end;
function Base64DecodeStr(const Value: string): string;
begin
SetLength(Result,(Length(Value) div 4) * 3);
SetLength(Result,Base64Decode(@Value[1],@Result[1],Length(Value)));
end;
end.