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Minecraft.Client/Durango/Network/base64.cpp

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+/* 
+   base64.cpp and base64.h
+
+   Copyright (C) 2004-2008 Ren<65> 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<65> 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++] = (unsigned char)(encoded_string->Data()[in_]);
+		in_++;
+		if (i ==4)
+		{
+			for (i = 0; i <4; i++)
+			{
+				char_array_4[i] = (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] = (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;
+		}
+	}
+}