341 lines
9.9 KiB
C++
341 lines
9.9 KiB
C++
/*
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* (c) Copyright Ascensio System SIA 2010-2023
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*
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* This program is a free software product. You can redistribute it and/or
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* modify it under the terms of the GNU Affero General Public License (AGPL)
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* version 3 as published by the Free Software Foundation. In accordance with
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* Section 7(a) of the GNU AGPL its Section 15 shall be amended to the effect
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* that Ascensio System SIA expressly excludes the warranty of non-infringement
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* of any third-party rights.
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*
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* This program is distributed WITHOUT ANY WARRANTY; without even the implied
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* warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. For
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* details, see the GNU AGPL at: http://www.gnu.org/licenses/agpl-3.0.html
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*
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* You can contact Ascensio System SIA at 20A-6 Ernesta Birznieka-Upish
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* street, Riga, Latvia, EU, LV-1050.
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*
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* The interactive user interfaces in modified source and object code versions
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* of the Program must display Appropriate Legal Notices, as required under
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* Section 5 of the GNU AGPL version 3.
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*
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* Pursuant to Section 7(b) of the License you must retain the original Product
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* logo when distributing the program. Pursuant to Section 7(e) we decline to
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* grant you any rights under trademark law for use of our trademarks.
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*
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* All the Product's GUI elements, including illustrations and icon sets, as
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* well as technical writing content are licensed under the terms of the
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* Creative Commons Attribution-ShareAlike 4.0 International. See the License
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* terms at http://creativecommons.org/licenses/by-sa/4.0/legalcode
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*
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*/
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#ifndef BASE64_H_DEFINE
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#define BASE64_H_DEFINE
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#pragma once
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#include <stdio.h>
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#pragma pack(push, 8)
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namespace Base64
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{
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const int B64_BASE64_FLAG_NONE = 0;
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const int B64_BASE64_FLAG_NOPAD = 1;
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const int B64_BASE64_FLAG_NOCRLF = 2;
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const int B64_BASE64_INT_MAX = 2147483647; /* maximum (signed) int value */
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inline int Base64EncodeGetRequiredLength(int nSrcLen, DWORD dwFlags = B64_BASE64_FLAG_NONE)
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{
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__int64 nSrcLen4 = static_cast<__int64>(nSrcLen)*4;
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if (nSrcLen4 > B64_BASE64_INT_MAX)
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return -1;
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int nRet = static_cast<int>(nSrcLen4/3);
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if ((dwFlags & B64_BASE64_FLAG_NOPAD) == 0)
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nRet += nSrcLen % 3;
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int nCRLFs = nRet / 76 + 1;
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int nOnLastLine = nRet % 76;
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if (nOnLastLine)
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{
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if (nOnLastLine % 4)
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nRet += 4-(nOnLastLine % 4);
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}
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nCRLFs *= 2;
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if ((dwFlags & B64_BASE64_FLAG_NOCRLF) == 0)
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nRet += nCRLFs;
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return nRet;
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}
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inline int Base64DecodeGetRequiredLength(int nSrcLen) throw()
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{
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return nSrcLen;
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}
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inline bool Base64Encode(const BYTE *pbSrcData, int nSrcLen, char* szDest, int *pnDestLen, DWORD dwFlags = B64_BASE64_FLAG_NONE) throw()
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{
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static const char s_chBase64EncodingTable[64] = {
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'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q',
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'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z', 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h',
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'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y',
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'z', '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '+', '/' };
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if (!pbSrcData || !szDest || !pnDestLen)
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return false;
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if (*pnDestLen < Base64EncodeGetRequiredLength(nSrcLen, dwFlags))
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return false;
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int nWritten( 0 );
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int nLen1( (nSrcLen/3)*4 );
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int nLen2( nLen1/76 );
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int nLen3( 19 );
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for (int i=0; i<=nLen2; i++)
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{
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if (i==nLen2)
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nLen3 = (nLen1%76)/4;
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for (int j=0; j<nLen3; j++)
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{
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DWORD dwCurr(0);
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for (int n=0; n<3; n++)
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{
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dwCurr |= *pbSrcData++;
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dwCurr <<= 8;
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}
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for (int k=0; k<4; k++)
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{
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BYTE b = (BYTE)(dwCurr>>26);
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*szDest++ = s_chBase64EncodingTable[b];
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dwCurr <<= 6;
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}
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}
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nWritten+= nLen3*4;
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if ((dwFlags & B64_BASE64_FLAG_NOCRLF)==0)
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{
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*szDest++ = '\r';
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*szDest++ = '\n';
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nWritten+= 2;
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}
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}
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if (nWritten && (dwFlags & B64_BASE64_FLAG_NOCRLF)==0)
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{
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szDest-= 2;
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nWritten -= 2;
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}
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nLen2 = (nSrcLen%3) ? (nSrcLen%3 + 1) : 0;
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if (nLen2 != 0)
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{
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DWORD dwCurr(0);
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for (int n=0; n<3; n++)
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{
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if (n<(nSrcLen%3))
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dwCurr |= *pbSrcData++;
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dwCurr <<= 8;
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}
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for (int k=0; k<nLen2; k++)
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{
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BYTE b = (BYTE)(dwCurr>>26);
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*szDest++ = s_chBase64EncodingTable[b];
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dwCurr <<= 6;
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}
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nWritten+= nLen2;
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if ((dwFlags & B64_BASE64_FLAG_NOPAD)==0)
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{
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nLen3 = (nLen2 != 0) ? 4 - nLen2 : 0;
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for (int j=0; j<nLen3; j++)
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{
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*szDest++ = '=';
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}
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nWritten+= nLen3;
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}
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}
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*pnDestLen = nWritten;
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return true;
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}
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inline int DecodeBase64Char(unsigned int ch) throw()
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{
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// returns -1 if the character is invalid
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// or should be skipped
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// otherwise, returns the 6-bit code for the character
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// from the encoding table
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if (ch >= 'A' && ch <= 'Z')
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return ch - 'A' + 0; // 0 range starts at 'A'
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if (ch >= 'a' && ch <= 'z')
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return ch - 'a' + 26; // 26 range starts at 'a'
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if (ch >= '0' && ch <= '9')
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return ch - '0' + 52; // 52 range starts at '0'
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if (ch == '+')
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return 62;
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if (ch == '/')
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return 63;
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return -1;
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}
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inline bool Base64Decode(const char* szSrc, int nSrcLen, BYTE *pbDest, int *pnDestLen) throw()
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{
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// walk the source buffer
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// each four character sequence is converted to 3 bytes
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// CRLFs and =, and any characters not in the encoding table
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// are skiped
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if (szSrc == NULL || pnDestLen == NULL)
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return false;
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const char* szSrcEnd = szSrc + nSrcLen;
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int nWritten = 0;
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bool bOverflow = (pbDest == NULL) ? true : false;
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while (szSrc < szSrcEnd && (*szSrc) != 0)
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{
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DWORD dwCurr = 0;
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int i;
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int nBits = 0;
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for (i=0; i<4; i++)
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{
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if (szSrc >= szSrcEnd)
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break;
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int nCh = DecodeBase64Char(*szSrc);
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szSrc++;
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if (nCh == -1)
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{
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// skip this char
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i--;
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continue;
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}
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dwCurr <<= 6;
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dwCurr |= nCh;
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nBits += 6;
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}
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if(!bOverflow && nWritten + (nBits/8) > (*pnDestLen))
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bOverflow = true;
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// dwCurr has the 3 bytes to write to the output buffer
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// left to right
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dwCurr <<= 24-nBits;
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for (i=0; i<nBits/8; i++)
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{
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if(!bOverflow)
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{
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*pbDest = (BYTE) ((dwCurr & 0x00ff0000) >> 16);
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pbDest++;
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}
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dwCurr <<= 8;
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nWritten++;
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}
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}
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*pnDestLen = nWritten;
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if(bOverflow)
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{
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// if (pbDest != NULL) ATLASSERT(FALSE);
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return false;
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}
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return true;
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}
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}
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#pragma pack(pop)
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namespace Base64_1
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{
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#define FF_ARRAY_ELEMS(a) (sizeof(a) / sizeof((a)[0]))
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#define BASE64_SIZE(x) (((x)+2) / 3 * 4 + 1)
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static const BYTE map2[] =
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{
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0x3e, 0xff, 0xff, 0xff, 0x3f, 0x34, 0x35, 0x36,
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0x37, 0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00, 0x01,
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0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09,
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0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, 0x10, 0x11,
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0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18, 0x19,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x1a, 0x1b,
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0x1c, 0x1d, 0x1e, 0x1f, 0x20, 0x21, 0x22, 0x23,
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0x24, 0x25, 0x26, 0x27, 0x28, 0x29, 0x2a, 0x2b,
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0x2c, 0x2d, 0x2e, 0x2f, 0x30, 0x31, 0x32, 0x33
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};
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static bool Base64Decode(const char* szSrc, int nSrcLen, BYTE *& pbDest, int *pnDestLen)
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{
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const char *in = szSrc;
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BYTE *out = pbDest;
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int out_size = *pnDestLen;
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int i, v;
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BYTE *dst = out;
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v = 0;
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for (i = 0; in[i] && in[i] != '='; i++)
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{
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unsigned int index= in[i]-43;
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if (index>=FF_ARRAY_ELEMS(map2) || map2[index] == 0xff)
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return false; ///???? было -1
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v = (v << 6) + map2[index];
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if (i & 3) {
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if (dst - out < out_size) {
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*dst++ = v >> (6 - 2 * (i & 3));
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}
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}
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}
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return true;
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}
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static bool Base64Encode(const BYTE *pbSrcData, int nSrcLen, BYTE *& szDest, int *pnDestLen)
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{
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const BYTE *in = pbSrcData;
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int in_size = nSrcLen;
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char *out = (char *)szDest;
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int out_size = *pnDestLen;
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static const char b64[] =
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"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
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char *ret, *dst;
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unsigned i_bits = 0;
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int i_shift = 0;
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int bytes_remaining = in_size;
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int out_size_1 =BASE64_SIZE(in_size);
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//if (/*in_size >= UINT_MAX / 4 ||*/out_size < BASE64_SIZE(in_size))
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// return false;
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ret = dst = out;
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while (bytes_remaining) {
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i_bits = (i_bits << 8) + *in++;
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bytes_remaining--;
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i_shift += 8;
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do {
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*dst++ = b64[(i_bits << 6 >> i_shift) & 0x3f];
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i_shift -= 6;
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} while (i_shift > 6 || (bytes_remaining == 0 && i_shift > 0));
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}
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while ((dst - ret) & 3)
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*dst++ = '=';
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*dst = '\0';
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return true;
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}
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}
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#endif//BASE64_H_DEFINE
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