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/*
base64.cpp and base64.h
Copyright (C) 2004-2008 Ren� 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.
Ren� Nyffenegger rene.nyffenegger@adp-gmbh.ch
*/
#include "stdafx.h"
#include "base64.h"
#include <iostream>
static const std::wstring base64_chars =
L"ABCDEFGHIJKLMNOPQRSTUVWXYZ"
L"abcdefghijklmnopqrstuvwxyz"
L"0123456789+/";
static inline bool is_base64(wchar_t c)
{
return (isalnum(c) || (c == L'+') || (c == L'/'));
}
// 4J changed to use Platform::String
Platform::String^ base64_encode(unsigned char* chars_to_encode, unsigned int in_len)
{
std::wstring 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++] = *(chars_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(int ii = 0; (ii <4) ; ii++)
{
ret += base64_chars[char_array_4[ii]];
}
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 += L'=';
}
}
return ref new Platform::String(ret.c_str());
}
void base64_decode(Platform::String ^encoded_string, unsigned char *output, unsigned int out_len)
{
int in_len = encoded_string->Length();
int i = 0;
int j = 0;
int in_ = 0;
unsigned char char_array_4[4];
unsigned char char_array_3[3];
unsigned char *pucOut = output;
while (in_len-- && ( encoded_string->Data()[in_] != L'=') && is_base64(encoded_string->Data()[in_]))
{
char_array_4[i++] = static_cast<unsigned char>(encoded_string->Data()[in_]);
in_++;
if (i ==4)
{
for (i = 0; i <4; i++)
{
char_array_4[i] = static_cast<unsigned char>(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++)
{
*pucOut++ = char_array_3[i];
if( ( pucOut - output ) >= out_len ) return;
}
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] = static_cast<unsigned char>(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++)
{
*pucOut++ = char_array_3[j];
if( ( pucOut - output ) >= out_len ) return;
}
}
}
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