Add base64 conversions and tests

Builds/VisualStudio2013/RippleD.vcxproj

@@ -298,6 +298,8 @@
     </ClInclude>
     <ClInclude Include="..\..\src\beast\beast\Crypto.h">
     </ClInclude>
+    <ClInclude Include="..\..\src\beast\beast\crypto\base64.h">
+    </ClInclude>
     <ClInclude Include="..\..\src\beast\beast\crypto\BinaryEncoding.h">
     </ClInclude>
     <ClCompile Include="..\..\src\beast\beast\crypto\Crypto.unity.cpp">
@@ -321,6 +323,9 @@
     </ClInclude>
     <ClInclude Include="..\..\src\beast\beast\crypto\Sha256.h">
     </ClInclude>
+    <ClCompile Include="..\..\src\beast\beast\crypto\tests\base64.test.cpp">
+      <ExcludedFromBuild>True</ExcludedFromBuild>
+    </ClCompile>
     <ClCompile Include="..\..\src\beast\beast\crypto\tests\BinaryEncoding.cpp">
       <ExcludedFromBuild>True</ExcludedFromBuild>
     </ClCompile>

Builds/VisualStudio2013/RippleD.vcxproj.filters

@@ -891,6 +891,9 @@
     <ClInclude Include="..\..\src\beast\beast\Crypto.h">
       <Filter>beast</Filter>
     </ClInclude>
+    <ClInclude Include="..\..\src\beast\beast\crypto\base64.h">
+      <Filter>beast\crypto</Filter>
+    </ClInclude>
     <ClInclude Include="..\..\src\beast\beast\crypto\BinaryEncoding.h">
       <Filter>beast\crypto</Filter>
     </ClInclude>
@@ -918,6 +921,9 @@
     <ClInclude Include="..\..\src\beast\beast\crypto\Sha256.h">
       <Filter>beast\crypto</Filter>
     </ClInclude>
+    <ClCompile Include="..\..\src\beast\beast\crypto\tests\base64.test.cpp">
+      <Filter>beast\crypto\tests</Filter>
+    </ClCompile>
     <ClCompile Include="..\..\src\beast\beast\crypto\tests\BinaryEncoding.cpp">
       <Filter>beast\crypto\tests</Filter>
     </ClCompile>

src/beast/beast/crypto/Crypto.unity.cpp

@@ -26,5 +26,6 @@
 #include <beast/crypto/impl/UnsignedInteger.cpp>
 
 #include <beast/crypto/tests/BinaryEncoding.cpp>
+#include <beast/crypto/tests/base64.test.cpp>
 
 #include <beast/crypto/tests/UnsignedInteger.test.cpp>

src/beast/beast/crypto/base64.h

@@ -0,0 +1,186 @@
+//------------------------------------------------------------------------------
+/*
+    This file is part of Beast: https://github.com/vinniefalco/Beast
+    Copyright 2013, Vinnie Falco <vinnie.falco@gmail.com>
+
+    Permission to use, copy, modify, and/or distribute this software for any
+    purpose  with  or without fee is hereby granted, provided that the above
+    copyright notice and this permission notice appear in all copies.
+
+    THE  SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+    WITH  REGARD  TO  THIS  SOFTWARE  INCLUDING  ALL  IMPLIED  WARRANTIES  OF
+    MERCHANTABILITY  AND  FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+    ANY  SPECIAL ,  DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+    WHATSOEVER  RESULTING  FROM  LOSS  OF USE, DATA OR PROFITS, WHETHER IN AN
+    ACTION  OF  CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+    OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+*/
+//==============================================================================
+
+#ifndef BEAST_CRYPTO_BASE64_H_INCLUDED
+#define BEAST_CRYPTO_BASE64_H_INCLUDED
+
+#include <cctype>
+#include <string>
+
+namespace beast {
+
+/* 
+   Portions from http://www.adp-gmbh.ch/cpp/common/base64.html
+   Copyright notice:
+
+   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
+
+*/
+
+template <class = void>
+std::string const&
+base64_alphabet()
+{
+    static std::string const alphabet =
+        "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
+        "abcdefghijklmnopqrstuvwxyz"
+        "0123456789+/";
+    return alphabet;
+}
+
+inline
+bool
+is_base64(unsigned char c)
+{
+    return (std::isalnum(c) || (c == '+') || (c == '/'));
+}
+
+template <class = void>
+std::string
+base64_encode (std::uint8_t const* data,
+    std::size_t in_len)
+{
+    unsigned char c3[3], c4[4];
+    int i = 0;
+    int j = 0;
+
+    std::string ret;
+    ret.reserve (3 + in_len * 8 / 6);
+
+    char const* alphabet (base64_alphabet().data());
+
+    while(in_len--)
+    {
+        c3[i++] = *(data++);
+        if(i == 3)
+        {
+            c4[0] = (c3[0] & 0xfc) >> 2;
+            c4[1] = ((c3[0] & 0x03) << 4) + ((c3[1] & 0xf0) >> 4);
+            c4[2] = ((c3[1] & 0x0f) << 2) + ((c3[2] & 0xc0) >> 6);
+            c4[3] = c3[2] & 0x3f;
+            for(i = 0; (i < 4); i++)
+                ret += alphabet[c4[i]];
+            i = 0;
+        }
+    }
+
+    if(i)
+    {
+        for(j = i; j < 3; j++)
+            c3[j] = '\0';
+
+        c4[0] = (c3[0] & 0xfc) >> 2;
+        c4[1] = ((c3[0] & 0x03) << 4) + ((c3[1] & 0xf0) >> 4);
+        c4[2] = ((c3[1] & 0x0f) << 2) + ((c3[2] & 0xc0) >> 6);
+        c4[3] = c3[2] & 0x3f;
+
+        for(j = 0; (j < i + 1); j++)
+            ret += alphabet[c4[j]];
+
+        while((i++ < 3))
+            ret += '=';
+    }
+
+    return ret;
+
+}
+
+template <class = void>
+std::string
+base64_encode (std::string const& s)
+{
+    return base64_encode (reinterpret_cast <
+        std::uint8_t const*> (s.data()), s.size());
+}
+
+template <class = void>
+std::string
+base64_decode(std::string const& data)
+{
+    int in_len = data.size();
+    unsigned char c3[3], c4[4];
+    int i = 0;
+    int j = 0;
+    int in_ = 0;
+
+    std::string ret;
+    ret.reserve (in_len * 6 / 8); // ???
+
+    while(in_len-- && (data[in_] != '=') &&
+        is_base64(data[in_]))
+    {
+        c4[i++] = data[in_]; in_++;
+        if(i == 4) {
+            for(i = 0; i < 4; i++)
+                c4[i] = base64_alphabet().find(c4[i]);
+
+            c3[0] = (c4[0] << 2) + ((c4[1] & 0x30) >> 4);
+            c3[1] = ((c4[1] & 0xf) << 4) + ((c4[2] & 0x3c) >> 2);
+            c3[2] = ((c4[2] & 0x3) << 6) + c4[3];
+
+            for(i = 0; (i < 3); i++)
+                ret += c3[i];
+            i = 0;
+        }
+    }
+
+    if(i)
+    {
+        for(j = i; j < 4; j++)
+            c4[j] = 0;
+
+        for(j = 0; j < 4; j++)
+            c4[j] = base64_alphabet().find(c4[j]);
+
+        c3[0] = (c4[0] << 2) + ((c4[1] & 0x30) >> 4);
+        c3[1] = ((c4[1] & 0xf) << 4) + ((c4[2] & 0x3c) >> 2);
+        c3[2] = ((c4[2] & 0x3) << 6) + c4[3];
+
+        for(j = 0; (j < i - 1); j++)
+            ret += c3[j];
+    }
+
+    return ret;
+}
+
+}
+
+#endif

src/beast/beast/crypto/tests/base64.test.cpp

@@ -0,0 +1,51 @@
+//------------------------------------------------------------------------------
+/*
+    This file is part of Beast: https://github.com/vinniefalco/Beast
+    Copyright 2013, Vinnie Falco <vinnie.falco@gmail.com>
+
+    Permission to use, copy, modify, and/or distribute this software for any
+    purpose  with  or without fee is hereby granted, provided that the above
+    copyright notice and this permission notice appear in all copies.
+
+    THE  SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+    WITH  REGARD  TO  THIS  SOFTWARE  INCLUDING  ALL  IMPLIED  WARRANTIES  OF
+    MERCHANTABILITY  AND  FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+    ANY  SPECIAL ,  DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+    WHATSOEVER  RESULTING  FROM  LOSS  OF USE, DATA OR PROFITS, WHETHER IN AN
+    ACTION  OF  CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+    OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+*/
+//==============================================================================
+
+#include <beast/crypto/base64.h>
+#include <beast/unit_test/suite.h>
+
+namespace beast {
+
+class base64_test : public unit_test::suite
+{
+public:
+    void
+    check (std::string const& in, std::string const& out)
+    {
+        auto const encoded = base64_encode (in);
+        expect (encoded == out);
+        expect (base64_decode (encoded) == in);
+    }
+
+    void
+    run()
+    {
+        check ("",       "");
+        check ("f",      "Zg==");
+        check ("fo",     "Zm8=");
+        check ("foo",    "Zm9v");
+        check ("foob",   "Zm9vYg==");
+        check ("fooba",  "Zm9vYmE=");
+        check ("foobar", "Zm9vYmFy");
+    }
+};
+
+BEAST_DEFINE_TESTSUITE(base64,crypto,beast);
+
+}