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Initial commit of Command & Conquer Renegade source code.

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LFeenanEA
2025-02-27 16:39:46 +00:00
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commit 58ed459113
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Code/wwlib/b64straw.cpp Normal file
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/*
** Command & Conquer Renegade(tm)
** Copyright 2025 Electronic Arts Inc.
**
** This program 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.
**
** This program is distributed in the hope that it will be useful,
** but WITHOUT ANY WARRANTY; without even the implied warranty of
** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
** GNU General Public License for more details.
**
** You should have received a copy of the GNU General Public License
** along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
/***********************************************************************************************
*** 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 *
* *
* $Archive:: /Commando/Library/B64STRAW.CPP $*
* *
* $Author:: Greg_h $*
* *
* $Modtime:: 7/22/97 11:37a $*
* *
* $Revision:: 1 $*
* *
*---------------------------------------------------------------------------------------------*
* Functions: *
* Base64Straw::Get -- Fetch data and convert it to/from base 64 encoding. *
* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
#include "always.h"
#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);
}