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/******************************************************************************
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* $Id: cpl_base64.cpp 21954 2011-03-13 18:18:20Z warmerdam $
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* Project: Common Portability Library
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* Purpose: Encoding/Decoding Base64 strings
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* Author: Paul Ramsey <pramsey@cleverelephant.ca>
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* Dave Blasby <dblasby@gmail.com>
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******************************************************************************
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* Copyright (c) 2008 Paul Ramsey
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* Copyright (c) 2002 Refractions Research
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* Copyright (C) 2004-2008 René Nyffenegger
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* (see also part way down the file for license terms for René's code)
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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* The above copyright notice and this permission notice shall be included in
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* all copies of this Software or works derived from this Software.
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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* DEALINGS IN THE SOFTWARE.
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****************************************************************************/
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#include "cpl_string.h"
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CPL_CVSID("$Id: cpl_base64.cpp 21954 2011-03-13 18:18:20Z warmerdam $");
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/* Derived from MapServer's mappostgis.c */
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** Decode a base64 character.
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static const unsigned char CPLBase64DecodeChar[256] = {
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/* not Base64 characters */
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64,64,64,64,64,64,64,64,64,64,64,64,64,64,64,64,
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64,64,64,64,64,64,64,64,64,64,64,64,64,64,64,64,
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64,64,64,64,64,64,64,64,64,64,64,
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/* not Base64 characters */
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52,53,54,55,56,57,58,59,60,61,
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/* not Base64 characters */
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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,
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/* not Base64 characters */
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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,
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/* not Base64 characters */
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/* not Base64 characters (upper 128 characters) */
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64,64,64,64,64,64,64,64,64,64,64,64,64,64,64,64,
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64,64,64,64,64,64,64,64,64,64,64,64,64,64,64,64,
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64,64,64,64,64,64,64,64,64,64,64,64,64,64,64,64,
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64,64,64,64,64,64,64,64,64,64,64,64,64,64,64,64,
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64,64,64,64,64,64,64,64,64,64,64,64,64,64,64,64,
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64,64,64,64,64,64,64,64,64,64,64,64,64,64,64,64,
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64,64,64,64,64,64,64,64,64,64,64,64,64,64,64,64,
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64,64,64,64,64,64,64,64,64,64,64,64,64,64,64,64
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/************************************************************************/
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/* CPLBase64DecodeInPlace() */
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/* Decode base64 string "pszBase64" (null terminated) in place */
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/* Returns length of decoded array or 0 on failure. */
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/************************************************************************/
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int CPLBase64DecodeInPlace(GByte* pszBase64)
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if (pszBase64 && *pszBase64) {
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unsigned char *p = pszBase64;
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/* Drop illegal chars first */
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for (i=0, j=0; pszBase64[i]; i++) {
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unsigned char c = pszBase64[i];
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if ( (CPLBase64DecodeChar[c] != 64) || (c == '=') ) {
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for (k=0; k<j; k+=4) {
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register unsigned char b1, b2, b3, b4, c3, c4;
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b1 = CPLBase64DecodeChar[pszBase64[k]];
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b2 = CPLBase64DecodeChar[pszBase64[k+1]];
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b2 = CPLBase64DecodeChar[pszBase64[k+1]];
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b2 = CPLBase64DecodeChar[pszBase64[k+1]];
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b3 = CPLBase64DecodeChar[c3];
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b4 = CPLBase64DecodeChar[c4];
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*p++=((b1<<2)|(b2>>4) );
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*p++=(((b2&0xf)<<4)|(b3>>2) );
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*p++=(((b3&0x3)<<6)|b4 );
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* This function was extracted from the base64 cpp utility published by
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* René Nyffenegger. The code was modified into a form suitable for use in
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* CPL. The original code can be found at
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* http://www.adp-gmbh.ch/cpp/common/base64.html.
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* The following is the original notice of this function.
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* base64.cpp and base64.h
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* Copyright (C) 2004-2008 René Nyffenegger
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* This source code is provided 'as-is', without any express or implied
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* warranty. In no event will the author be held liable for any damages
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* arising from the use of this software.
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* Permission is granted to anyone to use this software for any purpose,
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* including commercial applications, and to alter it and redistribute it
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* freely, subject to the following restrictions:
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* 1. The origin of this source code must not be misrepresented; you must not
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* claim that you wrote the original source code. If you use this source code
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* in a product, an acknowledgment in the product documentation would be
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* appreciated but is not required.
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* 2. Altered source versions must be plainly marked as such, and must not be
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* misrepresented as being the original source code.
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* 3. This notice may not be removed or altered from any source distribution.
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* René Nyffenegger rene.nyffenegger@adp-gmbh.ch
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/************************************************************************/
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/* CPLBase64Encode() */
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/************************************************************************/
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char *CPLBase64Encode( int nDataLen, const GByte *pabyBytesToEncode )
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static const std::string base64Chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
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std::string result("");
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unsigned char charArray3[3];
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unsigned char charArray4[4];
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charArray3[i++] = *(pabyBytesToEncode++);
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charArray4[0] = (charArray3[0] & 0xfc) >> 2;
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charArray4[1] = ((charArray3[0] & 0x03) << 4) + ((charArray3[1] & 0xf0) >> 4);
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charArray4[2] = ((charArray3[1] & 0x0f) << 2) + ((charArray3[2] & 0xc0) >> 6);
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charArray4[3] = charArray3[2] & 0x3f;
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for( i = 0; i < 4; i++ )
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result += base64Chars[charArray4[i]];
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for( j = i; j < 3; j++ )
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charArray3[j] = '\0';
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charArray4[0] = (charArray3[0] & 0xfc) >> 2;
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charArray4[1] = ((charArray3[0] & 0x03) << 4) + ((charArray3[1] & 0xf0) >> 4);
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charArray4[2] = ((charArray3[1] & 0x0f) << 2) + ((charArray3[2] & 0xc0) >> 6);
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charArray4[3] = charArray3[2] & 0x3f;
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for ( j = 0; j < (i + 1); j++ )
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result += base64Chars[charArray4[j]];
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return (CPLStrdup(result.c_str()));