Commit 6bf4b853 authored by Alvarez, Gonzalo's avatar Alvarez, Gonzalo
Browse files

base64 encoder and decoder added

parent 66334b8a

drivers/base64test.cpp

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Original line number Diff line number Diff line 
/*

 *****

 ***** ATTENTION: This code has been modified from the original

 *****            and adapted for use in PsimagLite

 ***** Original notice is below



 ------------------------- begin original notice -------------------------------



Copyright (C) 2004-2008 René Nyffenegger



This source code is provided 'as-is', without any express or implied

warranty. In no event will the author be held liable for any damages

arising from the use of this software.



Permission is granted to anyone to use this software for any purpose,

including commercial applications, and to alter it and redistribute it

freely, subject to the following restrictions:



1. The origin of this source code must not be misrepresented; you must not

   claim that you wrote the original source code. If you use this source code

   in a product, an acknowledgment in the product documentation would be

   appreciated but is not required.



2. Altered source versions must be plainly marked as such, and must not be

   misrepresented as being the original source code.



3. This notice may not be removed or altered from any source distribution.



René Nyffenegger rene.nyffenegger@adp-gmbh.ch



------------------------- end original notice -------------------------------



***** Original notice is above

***** ATTENTION: This code has been modified from the original *****

*/



#include "PsiBase64.h"

#include <iostream>



int main()

{

	const PsimagLite::String s = "ADP GmbH\nAnalyse Design & Programmierung"

	                             "\nGesellschaft mit beschränkter Haftung" ;



	PsimagLite::PsiBase64 base64;

	PsimagLite::String encoded = base64.encode(s);

	std::cout<<"encoded: "<<encoded<<"\n";

	std::cout<<"decoded: "<<base64.decode(encoded)<<"\n";

}

src/PsiBase64.cpp

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Original line number Diff line number Diff line 
/*

 *****

 ***** ATTENTION: This code has been modified from the original

 *****            and adapted for use in PsimagLite

 ***** Original notice is below



 ------------------------- begin original notice -------------------------------



Copyright (C) 2004-2008 René Nyffenegger



This source code is provided 'as-is', without any express or implied

warranty. In no event will the author be held liable for any damages

arising from the use of this software.



Permission is granted to anyone to use this software for any purpose,

including commercial applications, and to alter it and redistribute it

freely, subject to the following restrictions:



1. The origin of this source code must not be misrepresented; you must not

   claim that you wrote the original source code. If you use this source code

   in a product, an acknowledgment in the product documentation would be

   appreciated but is not required.



2. Altered source versions must be plainly marked as such, and must not be

   misrepresented as being the original source code.



3. This notice may not be removed or altered from any source distribution.



René Nyffenegger rene.nyffenegger@adp-gmbh.ch



------------------------- end original notice -------------------------------



***** Original notice is above

***** ATTENTION: This code has been modified from the original *****

*/



#include "PsiBase64.h"



namespace PsimagLite {



const String PsiBase64::base64Chars_ =

        "ABCDEFGHIJKLMNOPQRSTUVWXYZ"

        "abcdefghijklmnopqrstuvwxyz"

        "0123456789+/";

}

src/PsiBase64.h

0 → 100644
+149 −0
Original line number Diff line number Diff line 
/*

 *****

 ***** ATTENTION: This code has been modified from the original *****

 *****            and adapted for use in PsimagLite

 *****

------------------------- begin original notice -------------------------------



Copyright (C) 2004-2008 René Nyffenegger



This source code is provided 'as-is', without any express or implied

warranty. In no event will the author be held liable for any damages

arising from the use of this software.



Permission is granted to anyone to use this software for any purpose,

including commercial applications, and to alter it and redistribute it

freely, subject to the following restrictions:



1. The origin of this source code must not be misrepresented; you must not

   claim that you wrote the original source code. If you use this source code

   in a product, an acknowledgment in the product documentation would be

   appreciated but is not required.



2. Altered source versions must be plainly marked as such, and must not be

   misrepresented as being the original source code.



3. This notice may not be removed or altered from any source distribution.



René Nyffenegger rene.nyffenegger@adp-gmbh.ch



------------------------- end original notice -------------------------------



***** Original notice is above

***** ATTENTION: This code has been modified from the original *****

*/



#ifndef PSIBASE64_H

#define PSIBASE64_H



#include "Vector.h"



namespace PsimagLite {



class PsiBase64 {



public:



	const String& encode(const String& str)

	{

		return encode(reinterpret_cast<const unsigned char*>(str.c_str()),str.length());

	}



	const String& encode(unsigned char const* bytesToEncode, unsigned int inLen)

	{

		buffer_ = "";

		int i = 0;

		int j = 0;

		unsigned char charArray3[3];

		unsigned char charArray4[4];



		while (inLen--) {

			charArray3[i++] = *(bytesToEncode++);

			if (i == 3) {

				charArray4[0] = (charArray3[0] & 0xfc) >> 2;

				charArray4[1] = ((charArray3[0] & 0x03)<<4) + ((charArray3[1] & 0xf0)>>4);

				charArray4[2] = ((charArray3[1] & 0x0f)<<2) + ((charArray3[2] & 0xc0)>>6);

				charArray4[3] = charArray3[2] & 0x3f;



				for (i = 0; (i <4) ; i++)

					buffer_ += base64Chars_[charArray4[i]];

				i = 0;

			}

		}



		if (i) {

			for (j = i; j < 3; j++)

				charArray3[j] = '\0';



			charArray4[0] = (charArray3[0] & 0xfc) >> 2;

			charArray4[1] = ((charArray3[0] & 0x03) << 4) + ((charArray3[1] & 0xf0) >> 4);

			charArray4[2] = ((charArray3[1] & 0x0f) << 2) + ((charArray3[2] & 0xc0) >> 6);

			charArray4[3] = charArray3[2] & 0x3f;



			for (j = 0; (j < i + 1); j++)

				buffer_ += base64Chars_[charArray4[j]];



			while ((i++ < 3)) buffer_ += '=';

		}



		return buffer_;

	}



	const String& decode(const String& encodedString)

	{

		buffer_ = "";

		int inLen = encodedString.size();

		int i = 0;

		int j = 0;

		int in_ = 0;

		unsigned char charArray4[4], charArray3[3];



		while (inLen-- && (encodedString[in_] != '=') && isBase64(encodedString[in_])) {

			charArray4[i++] = encodedString[in_]; in_++;

			if (i ==4) {

				for (i = 0; i <4; i++)

					charArray4[i] = base64Chars_.find(charArray4[i]);



				charArray3[0] = (charArray4[0] << 2) + ((charArray4[1] & 0x30) >> 4);

				charArray3[1] = ((charArray4[1] & 0xf) << 4) + ((charArray4[2] & 0x3c) >> 2);

				charArray3[2] = ((charArray4[2] & 0x3) << 6) + charArray4[3];



				for (i = 0; (i < 3); i++)

					buffer_ += charArray3[i];

				i = 0;

			}

		}



		if (i) {

			for (j = i; j <4; j++)

				charArray4[j] = 0;



			for (j = 0; j <4; j++)

				charArray4[j] = base64Chars_.find(charArray4[j]);



			charArray3[0] = (charArray4[0] << 2) + ((charArray4[1] & 0x30) >> 4);

			charArray3[1] = ((charArray4[1] & 0xf) << 4) + ((charArray4[2] & 0x3c) >> 2);

			charArray3[2] = ((charArray4[2] & 0x3) << 6) + charArray4[3];



			for (j = 0; (j < i - 1); j++) buffer_ += charArray3[j];

		}



		return buffer_;

	}



	const String& result() const { return buffer_; }



private:



	static bool isBase64(unsigned char c) {

		return (isalnum(c) || (c == '+') || (c == '/'));

	}



	static const String base64Chars_;



	String buffer_;

};

}



#endif // PSIBASE64_H