118 lines
5.5 KiB
C++
118 lines
5.5 KiB
C++
/*
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** Command & Conquer Red Alert(tm)
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** Copyright 2025 Electronic Arts Inc.
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**
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** This program is free software: you can redistribute it and/or modify
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** it under the terms of the GNU General Public License as published by
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** the Free Software Foundation, either version 3 of the License, or
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** (at your option) any later version.
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**
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** This program is distributed in the hope that it will be useful,
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** but WITHOUT ANY WARRANTY; without even the implied warranty of
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** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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** GNU General Public License for more details.
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**
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** You should have received a copy of the GNU General Public License
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** along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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/* $Header: /CounterStrike/B64STRAW.CPP 1 3/03/97 10:24a Joe_bostic $ */
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/***********************************************************************************************
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*** 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 ***
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***********************************************************************************************
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* *
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* Project Name : Command & Conquer *
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* *
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* File Name : B64STRAW.CPP *
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* *
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* Programmer : Joe L. Bostic *
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* *
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* Start Date : 07/02/96 *
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* *
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* Last Update : July 3, 1996 [JLB] *
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* *
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*---------------------------------------------------------------------------------------------*
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* Functions: *
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* Base64Straw::Get -- Fetch data and convert it to/from base 64 encoding. *
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* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
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#include "b64straw.h"
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#include "base64.h"
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#include <string.h>
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/***********************************************************************************************
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* Base64Straw::Get -- Fetch data and convert it to/from base 64 encoding. *
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* *
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* This routine will fetch the number of bytes requested and perform any conversion as *
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* necessary upon the data. The nature of Base 64 encoding means that the data will *
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* increase in size by 30% when encoding and decrease in like manner when decoding. *
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* *
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* INPUT: source -- The buffer to hold the processed data. *
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* *
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* length -- The number of bytes requested. *
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* *
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* OUTPUT: Returns with the number of bytes stored into the buffer. If the number is less *
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* than requested, then this indicates that the data stream has been exhausted. *
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* *
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* WARNINGS: none *
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* *
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* HISTORY: *
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* 07/03/1996 JLB : Created. *
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*=============================================================================================*/
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int Base64Straw::Get(void * source, int slen)
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{
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int total = 0;
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char * from;
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int fromsize;
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char * to;
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int tosize;
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if (Control == ENCODE) {
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from = PBuffer;
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fromsize = sizeof(PBuffer);
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to = CBuffer;
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tosize = sizeof(CBuffer);
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} else {
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from = CBuffer;
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fromsize = sizeof(CBuffer);
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to = PBuffer;
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tosize = sizeof(PBuffer);
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}
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/*
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** Process the byte request in code blocks until there are either
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** no more source bytes available or the request has been fulfilled.
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*/
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while (slen > 0) {
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/*
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** Transfer any processed bytes available to the request buffer.
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*/
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if (Counter > 0) {
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int len = (slen < Counter) ? slen : Counter;
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memmove(source, &to[tosize-Counter], len);
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Counter -= len;
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slen -= len;
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source = ((char *)source) + len;
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total += len;
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}
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if (slen == 0) break;
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/*
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** More bytes are needed, so fetch and process another base 64 block.
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*/
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int incount = Straw::Get(from, fromsize);
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if (Control == ENCODE) {
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Counter = Base64_Encode(from, incount, to, tosize);
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} else {
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Counter = Base64_Decode(from, incount, to, tosize);
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}
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if (Counter == 0) break;
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}
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return(total);
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}
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