ResInsight/VisualizationModules/LibCore/cvfBase64.cpp

//##################################################################################################
//
//  CeeVizFramework
//  Lib: LibCore
//  
//  --------------------------------------------------------------------------------------------
//  Please see references below for copyright, usage rights and license for this file.
//##################################################################################################

#include "cvfBase.h"
#include "cvfBase64.h"

#ifdef WIN32
#pragma warning (disable: 4242 4244 4267 4365)
#endif

CVF_GCC_DIAGNOSTIC_IGNORE("-Wconversion")
CVF_GCC_DIAGNOSTIC_IGNORE("-Wunused-parameter")

#ifdef CVF_LINUX
#include <stdio.h>
#include <stdlib.h>
#endif


// Doxygen conditional section to hide contents of the cvf_base64 namespace
/// \cond CVF_NEVER_INCLUDE

namespace cvf_base64
{
//## START -- base64.cpp
   
//////////////////////////////////////////////////////////////////////////
// start include
//  base64.h
//////////////////////////////////////////////////////////////////////////

/* 
base64.cpp and base64.h

Copyright (C) 2004-2008 Rene 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.

Rene Nyffenegger rene.nyffenegger@adp-gmbh.ch

*/

// Commented out by Ceetron
//#include "base64.h"
//#include <iostream>

static const std::string base64_chars = 
    "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
    "abcdefghijklmnopqrstuvwxyz"
    "0123456789+/";


static inline bool is_base64(unsigned char c) {
    return (isalnum(c) || (c == '+') || (c == '/'));
}

std::string base64_encode(unsigned char const* bytes_to_encode, unsigned int in_len) {
    std::string ret;
    int i = 0;
    int j = 0;
    unsigned char char_array_3[3];
    unsigned char char_array_4[4];

    while (in_len--) {
        char_array_3[i++] = *(bytes_to_encode++);
        if (i == 3) {
            char_array_4[0] = (char_array_3[0] & 0xfc) >> 2;
            char_array_4[1] = ((char_array_3[0] & 0x03) << 4) + ((char_array_3[1] & 0xf0) >> 4);
            char_array_4[2] = ((char_array_3[1] & 0x0f) << 2) + ((char_array_3[2] & 0xc0) >> 6);
            char_array_4[3] = char_array_3[2] & 0x3f;

            for(i = 0; (i <4) ; i++)
                ret += base64_chars[char_array_4[i]];
            i = 0;
        }
    }

    if (i)
    {
        for(j = i; j < 3; j++)
            char_array_3[j] = '\0';

        char_array_4[0] = (char_array_3[0] & 0xfc) >> 2;
        char_array_4[1] = ((char_array_3[0] & 0x03) << 4) + ((char_array_3[1] & 0xf0) >> 4);
        char_array_4[2] = ((char_array_3[1] & 0x0f) << 2) + ((char_array_3[2] & 0xc0) >> 6);
        char_array_4[3] = char_array_3[2] & 0x3f;

        for (j = 0; (j < i + 1); j++)
            ret += base64_chars[char_array_4[j]];

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

    }

    return ret;

}

std::string base64_decode(std::string const& encoded_string) {
    int in_len = encoded_string.size();
    int i = 0;
    int j = 0;
    int in_ = 0;
    unsigned char char_array_4[4], char_array_3[3];
    std::string ret;

    while (in_len-- && ( encoded_string[in_] != '=') && is_base64(encoded_string[in_])) {
        char_array_4[i++] = encoded_string[in_]; in_++;
        if (i ==4) {
            for (i = 0; i <4; i++)
                char_array_4[i] = base64_chars.find(char_array_4[i]);

            char_array_3[0] = (char_array_4[0] << 2) + ((char_array_4[1] & 0x30) >> 4);
            char_array_3[1] = ((char_array_4[1] & 0xf) << 4) + ((char_array_4[2] & 0x3c) >> 2);
            char_array_3[2] = ((char_array_4[2] & 0x3) << 6) + char_array_4[3];

            for (i = 0; (i < 3); i++)
                ret += char_array_3[i];
            i = 0;
        }
    }

    if (i) {
        for (j = i; j <4; j++)
            char_array_4[j] = 0;

        for (j = 0; j <4; j++)
            char_array_4[j] = base64_chars.find(char_array_4[j]);

        char_array_3[0] = (char_array_4[0] << 2) + ((char_array_4[1] & 0x30) >> 4);
        char_array_3[1] = ((char_array_4[1] & 0xf) << 4) + ((char_array_4[2] & 0x3c) >> 2);
        char_array_3[2] = ((char_array_4[2] & 0x3) << 6) + char_array_4[3];

        for (j = 0; (j < i - 1); j++) ret += char_array_3[j];
    }

    return ret;
}
//## END -- base64.cpp 

} // namespace cvf_base64

// End of Doxygen conditional section
/// \endcond


namespace cvf {

//==================================================================================================
///
/// \class cvf::Base64
/// \ingroup Core
///
/// Base64 encoding and decoding for representing binary data in an ASCII string format by 
/// translating it into a radix-64 representation.
///
//==================================================================================================

//--------------------------------------------------------------------------------------------------
/// Encode a binary buffer
//--------------------------------------------------------------------------------------------------
std::string Base64::encode(const cvf::UByteArray& data)
{
    return (data.size() > 0) ? cvf_base64::base64_encode(data.ptr(), data.size()) : "";
}


//--------------------------------------------------------------------------------------------------
/// Decode already encoded data. Array returned is NULL if unable to decode
//--------------------------------------------------------------------------------------------------
cvf::ref<cvf::UByteArray> Base64::decode(const std::string& encodedData)
{
    if (encodedData.size() < 1) return NULL;

    std::string decodedData = cvf_base64::base64_decode(encodedData);
    size_t numDecodedBytes = decodedData.length();
    if (numDecodedBytes == 0) return NULL;

    cvf::UByteArray* data = new cvf::UByteArray;
    data->resize(numDecodedBytes);
    data->copyData(reinterpret_cast<const unsigned char*>(decodedData.c_str()), numDecodedBytes, 0);

    return data;
}

} // namespace cvf