B64STRAW.CPP (5725B)
1 // 2 // Copyright 2020 Electronic Arts Inc. 3 // 4 // TiberianDawn.DLL and RedAlert.dll and corresponding source code is free 5 // software: you can redistribute it and/or modify it under the terms of 6 // the GNU General Public License as published by the Free Software Foundation, 7 // either version 3 of the License, or (at your option) any later version. 8 9 // TiberianDawn.DLL and RedAlert.dll and corresponding source code is distributed 10 // in the hope that it will be useful, but with permitted additional restrictions 11 // under Section 7 of the GPL. See the GNU General Public License in LICENSE.TXT 12 // distributed with this program. You should have received a copy of the 13 // GNU General Public License along with permitted additional restrictions 14 // with this program. If not, see https://github.com/electronicarts/CnC_Remastered_Collection 15 16 /* $Header: /CounterStrike/B64STRAW.CPP 1 3/03/97 10:24a Joe_bostic $ */ 17 /*********************************************************************************************** 18 *** 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 *** 19 *********************************************************************************************** 20 * * 21 * Project Name : Command & Conquer * 22 * * 23 * File Name : B64STRAW.CPP * 24 * * 25 * Programmer : Joe L. Bostic * 26 * * 27 * Start Date : 07/02/96 * 28 * * 29 * Last Update : July 3, 1996 [JLB] * 30 * * 31 *---------------------------------------------------------------------------------------------* 32 * Functions: * 33 * Base64Straw::Get -- Fetch data and convert it to/from base 64 encoding. * 34 * - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */ 35 36 37 #include "b64straw.h" 38 #include "base64.h" 39 #include <string.h> 40 41 42 /*********************************************************************************************** 43 * Base64Straw::Get -- Fetch data and convert it to/from base 64 encoding. * 44 * * 45 * This routine will fetch the number of bytes requested and perform any conversion as * 46 * necessary upon the data. The nature of Base 64 encoding means that the data will * 47 * increase in size by 30% when encoding and decrease in like manner when decoding. * 48 * * 49 * INPUT: source -- The buffer to hold the processed data. * 50 * * 51 * length -- The number of bytes requested. * 52 * * 53 * OUTPUT: Returns with the number of bytes stored into the buffer. If the number is less * 54 * than requested, then this indicates that the data stream has been exhausted. * 55 * * 56 * WARNINGS: none * 57 * * 58 * HISTORY: * 59 * 07/03/1996 JLB : Created. * 60 *=============================================================================================*/ 61 int Base64Straw::Get(void * source, int slen) 62 { 63 int total = 0; 64 65 char * from; 66 int fromsize; 67 char * to; 68 int tosize; 69 70 if (Control == ENCODE) { 71 from = PBuffer; 72 fromsize = sizeof(PBuffer); 73 to = CBuffer; 74 tosize = sizeof(CBuffer); 75 } else { 76 from = CBuffer; 77 fromsize = sizeof(CBuffer); 78 to = PBuffer; 79 tosize = sizeof(PBuffer); 80 } 81 82 /* 83 ** Process the byte request in code blocks until there are either 84 ** no more source bytes available or the request has been fulfilled. 85 */ 86 while (slen > 0) { 87 88 /* 89 ** Transfer any processed bytes available to the request buffer. 90 */ 91 if (Counter > 0) { 92 int len = (slen < Counter) ? slen : Counter; 93 memmove(source, &to[tosize-Counter], len); 94 Counter -= len; 95 slen -= len; 96 source = ((char *)source) + len; 97 total += len; 98 } 99 if (slen == 0) break; 100 101 /* 102 ** More bytes are needed, so fetch and process another base 64 block. 103 */ 104 int incount = Straw::Get(from, fromsize); 105 if (Control == ENCODE) { 106 Counter = Base64_Encode(from, incount, to, tosize); 107 } else { 108 Counter = Base64_Decode(from, incount, to, tosize); 109 } 110 if (Counter == 0) break; 111 } 112 113 return(total); 114 }