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/*==LICENSE==*
CyanWorlds.com Engine - MMOG client, server and tools
Copyright (C) 2011 Cyan Worlds, 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/>.
You can contact Cyan Worlds, Inc. by email legal@cyan.com
or by snail mail at:
Cyan Worlds, Inc.
14617 N Newport Hwy
Mead, WA 99021
*==LICENSE==*/
/*****************************************************************************
*
* $/Plasma20/Sources/Plasma/NucleusLib/pnUtils/Private/pnUtBase64.cpp
*
***/
#include "../Pch.h"
#pragma hdrstop
/*****************************************************************************
*
* Private
*
***/
static const char kEncode64[] = {
// 0000000000111111111122222222223333333333444444444455555555556666
// 0123456789012345678901234567890123456789012345678901234567890123
"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"
};
// Note that the decode table contains one special entry:
// The '-' character (0x2d) maps to 63 just like '/' (0x2f)
// so that URLs will work with Base64Decode when we implement them.
#define kTerminator 127
#define xx kTerminator
static const char kDecode64[] = {
// 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
xx,xx,xx,xx,xx,xx,xx,xx,xx,xx,xx,xx,xx,xx,xx,xx,
xx,xx,xx,xx,xx,xx,xx,xx,xx,xx,xx,xx,xx,xx,xx,xx,
xx,xx,xx,xx,xx,xx,xx,xx,xx,xx,xx,62,xx,63,xx,63,
52,53,54,55,56,57,58,59,60,61,xx,xx,xx,xx,xx,xx,
xx, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9,10,11,12,13,14,
15,16,17,18,19,20,21,22,23,24,25,xx,xx,xx,xx,xx,
xx,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,
41,42,43,44,45,46,47,48,49,50,51,xx,xx,xx,xx,xx,
xx,xx,xx,xx,xx,xx,xx,xx,xx,xx,xx,xx,xx,xx,xx,xx,
xx,xx,xx,xx,xx,xx,xx,xx,xx,xx,xx,xx,xx,xx,xx,xx,
xx,xx,xx,xx,xx,xx,xx,xx,xx,xx,xx,xx,xx,xx,xx,xx,
xx,xx,xx,xx,xx,xx,xx,xx,xx,xx,xx,xx,xx,xx,xx,xx,
xx,xx,xx,xx,xx,xx,xx,xx,xx,xx,xx,xx,xx,xx,xx,xx,
xx,xx,xx,xx,xx,xx,xx,xx,xx,xx,xx,xx,xx,xx,xx,xx,
xx,xx,xx,xx,xx,xx,xx,xx,xx,xx,xx,xx,xx,xx,xx,xx,
xx,xx,xx,xx,xx,xx,xx,xx,xx,xx,xx,xx,xx,xx,xx,xx,
};
#undef xx
static const char kFillchar = '=';
/*****************************************************************************
*
* Exports
*
***/
//============================================================================
unsigned Base64Encode (
unsigned srcChars,
const byte srcData[],
unsigned dstChars,
char * dstData
) {
ASSERT(srcData);
ASSERT(dstChars >= Base64EncodeSize(srcChars));
ASSERT(dstData);
const char * dstBase = dstData;
const byte * srcTerm = srcData + srcChars;
for (;;) switch (srcTerm - srcData) {
case 0:
*dstData++ = 0;
return dstData - dstBase;
case 1:
*dstData++ = kEncode64[ ((srcData[0] >> 2) & 0x3f) ];
*dstData++ = kEncode64[ ((srcData[0] << 4) & 0x30) ];
*dstData++ = kFillchar;
*dstData++ = kFillchar;
*dstData++ = 0;
return dstData - dstBase;
case 2:
*dstData++ = kEncode64[ ((srcData[0] >> 2) & 0x3f) ];
*dstData++ = kEncode64[ ((srcData[0] << 4) & 0x30) + ((srcData[1] >> 4) & 0x0f) ];
*dstData++ = kEncode64[ ((srcData[1] << 2) & 0x3c) ];
*dstData++ = kFillchar;
*dstData++ = 0;
return dstData - dstBase;
default:
*dstData++ = kEncode64[ ((srcData[0] >> 2) & 0x3f) ];
*dstData++ = kEncode64[ ((srcData[0] << 4) & 0x30) + ((srcData[1] >> 4) & 0x0f) ];
*dstData++ = kEncode64[ ((srcData[1] << 2) & 0x3c) + ((srcData[2] >> 6) & 0x03) ];
*dstData++ = kEncode64[ (srcData[2] & 0x3f) ];
srcData += 3;
break;
}
}
//============================================================================
unsigned Base64Decode (
unsigned srcChars,
const char srcData[],
unsigned dstChars,
byte * dstData
) {
ASSERT(srcData);
ASSERT(dstChars >= Base64DecodeSize(srcChars, srcData));
ASSERT(dstData);
const byte * dstBase = dstData;
const char * srcTerm = srcData + srcChars;
while (srcTerm - srcData >= 4) {
*dstData++ = (byte) (
(kDecode64[srcData[0]] << 2 & 0xfc)
+(kDecode64[srcData[1]] >> 4 & 0x03)
);
if (kDecode64[srcData[2]] == kTerminator)
break;
*dstData++ = (byte) (
(kDecode64[srcData[1]] << 4 & 0xf0)
+(kDecode64[srcData[2]] >> 2 & 0x0f)
);
if (kDecode64[srcData[3]] == kTerminator)
break;
*dstData++ = (byte) (
(kDecode64[srcData[2]] << 6 & 0xc0)
+(kDecode64[srcData[3]])
);
srcData += 4;
}
return dstData - dstBase;
}