CnC_Remastered_Collection/REDALERT/B64STRAW.CPP

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//
// Copyright 2020 Electronic Arts Inc.
//
// TiberianDawn.DLL and RedAlert.dll and corresponding source code is free
// software: you can redistribute it and/or modify it under the terms of
// the GNU General Public License as published by the Free Software Foundation,
// either version 3 of the License, or (at your option) any later version.
// TiberianDawn.DLL and RedAlert.dll and corresponding source code is distributed
// in the hope that it will be useful, but with permitted additional restrictions
// under Section 7 of the GPL. See the GNU General Public License in LICENSE.TXT
// distributed with this program. You should have received a copy of the
// GNU General Public License along with permitted additional restrictions
// with this program. If not, see https://github.com/electronicarts/CnC_Remastered_Collection
/* $Header: /CounterStrike/B64STRAW.CPP 1 3/03/97 10:24a Joe_bostic $ */
/***********************************************************************************************
*** C O N F I D E N T I A L --- W E S T W O O D S T U D I O S ***
***********************************************************************************************
* *
* Project Name : Command & Conquer *
* *
* File Name : B64STRAW.CPP *
* *
* Programmer : Joe L. Bostic *
* *
* Start Date : 07/02/96 *
* *
* Last Update : July 3, 1996 [JLB] *
* *
*---------------------------------------------------------------------------------------------*
* Functions: *
* Base64Straw::Get -- Fetch data and convert it to/from base 64 encoding. *
* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
#include "b64straw.h"
#include "base64.h"
#include <string.h>
/***********************************************************************************************
* Base64Straw::Get -- Fetch data and convert it to/from base 64 encoding. *
* *
* This routine will fetch the number of bytes requested and perform any conversion as *
* necessary upon the data. The nature of Base 64 encoding means that the data will *
* increase in size by 30% when encoding and decrease in like manner when decoding. *
* *
* INPUT: source -- The buffer to hold the processed data. *
* *
* length -- The number of bytes requested. *
* *
* OUTPUT: Returns with the number of bytes stored into the buffer. If the number is less *
* than requested, then this indicates that the data stream has been exhausted. *
* *
* WARNINGS: none *
* *
* HISTORY: *
* 07/03/1996 JLB : Created. *
*=============================================================================================*/
int Base64Straw::Get(void * source, int slen)
{
int total = 0;
char * from;
int fromsize;
char * to;
int tosize;
if (Control == ENCODE) {
from = PBuffer;
fromsize = sizeof(PBuffer);
to = CBuffer;
tosize = sizeof(CBuffer);
} else {
from = CBuffer;
fromsize = sizeof(CBuffer);
to = PBuffer;
tosize = sizeof(PBuffer);
}
/*
** Process the byte request in code blocks until there are either
** no more source bytes available or the request has been fulfilled.
*/
while (slen > 0) {
/*
** Transfer any processed bytes available to the request buffer.
*/
if (Counter > 0) {
int len = (slen < Counter) ? slen : Counter;
memmove(source, &to[tosize-Counter], len);
Counter -= len;
slen -= len;
source = ((char *)source) + len;
total += len;
}
if (slen == 0) break;
/*
** More bytes are needed, so fetch and process another base 64 block.
*/
int incount = Straw::Get(from, fromsize);
if (Control == ENCODE) {
Counter = Base64_Encode(from, incount, to, tosize);
} else {
Counter = Base64_Decode(from, incount, to, tosize);
}
if (Counter == 0) break;
}
return(total);
}