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/*
* XMail by Davide Libenzi ( Intranet and Internet mail server )
* Copyright (C) 1999,..,2004 Davide Libenzi
*
* 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 2 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, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* Davide Libenzi <davidel@xmailserver.org>
*
*/
#include "SysInclude.h"
#include "SysDep.h"
#include "SvrDefines.h"
#include "ShBlocks.h"
#include "StrUtils.h"
#include "BuffSock.h"
#include "MiscUtils.h"
#include "Base64Enc.h"
#define OK 0
#define FAIL -1
#define BUFOVER -2
#define CHAR64(c) (((c) < 0 || (c) > 127) ? -1: index_64[(c)])
static char basis_64[] =
"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/???????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????";
static char index_64[128] = {
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 62, -1, -1, -1, 63,
52, 53, 54, 55, 56, 57, 58, 59, 60, 61, -1, -1, -1, -1, -1, -1,
-1, 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, -1, -1, -1, -1, -1,
-1, 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, -1, -1, -1, -1, -1
};
int Base64Encode(const char *pIn, int iInSize, char *pszOut, int *piOutSize)
{
const unsigned char *in = (const unsigned char *) pIn;
unsigned char *out = (unsigned char *) pszOut;
unsigned char oval;
char *blah;
int olen, omax = *piOutSize;
olen = (iInSize + 2) / 3 * 4;
*piOutSize = olen;
if (omax < olen)
return BUFOVER;
blah = (char *) out;
while (iInSize >= 3) {
/* user provided max buffer size; make sure we don't go over it */
*out++ = basis_64[in[0] >> 2];
*out++ = basis_64[((in[0] << 4) & 0x30) | (in[1] >> 4)];
*out++ = basis_64[((in[1] << 2) & 0x3c) | (in[2] >> 6)];
*out++ = basis_64[in[2] & 0x3f];
in += 3;
iInSize -= 3;
}
if (iInSize > 0) {
/* user provided max buffer size; make sure we don't go over it */
*out++ = basis_64[in[0] >> 2];
oval = (in[0] << 4) & 0x30;
if (iInSize > 1)
oval |= in[1] >> 4;
*out++ = basis_64[oval];
*out++ = (iInSize < 2) ? '=' : basis_64[(in[1] << 2) & 0x3c];
*out++ = '=';
}
if (olen < omax)
*out = '\0';
return OK;
}
int Base64Decode(const char *pszIn, int iInSize, char *pOut, int *piOutSize)
{
int i, c1, c2, c3, c4, omax = *piOutSize - 1, len = 0;
if (iInSize >= 2 && pszIn[0] == '+' && pszIn[1] == ' ')
pszIn += 2, iInSize -= 2;
if (*pszIn == '\0')
return FAIL;
for (i = 0; i < iInSize / 4; i++) {
c1 = pszIn[0];
if (CHAR64(c1) == -1)
return FAIL;
c2 = pszIn[1];
if (CHAR64(c2) == -1)
return FAIL;
c3 = pszIn[2];
if (c3 != '=' && CHAR64(c3) == -1)
return FAIL;
c4 = pszIn[3];
if (c4 != '=' && CHAR64(c4) == -1)
return FAIL;
pszIn += 4;
if (len >= omax)
return FAIL;
*pOut++ = (CHAR64(c1) << 2) | (CHAR64(c2) >> 4);
++len;
if (c3 != '=') {
if (len >= omax)
return FAIL;
*pOut++ = ((CHAR64(c2) << 4) & 0xf0) | (CHAR64(c3) >> 2);
++len;
if (c4 != '=') {
if (len >= omax)
return FAIL;
*pOut++ = ((CHAR64(c3) << 6) & 0xc0) | CHAR64(c4);
++len;
}
}
}
*pOut = 0;
*piOutSize = len;
return OK;
}
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