From 1ae432917c9c194b71e8a5422ea17cdb608c3650 Mon Sep 17 00:00:00 2001
From: noloader <noloader@57ff6487-cd31-0410-9ec3-f628ee90f5f0>
Date: Thu, 2 Jul 2015 00:58:24 +0000
Subject: Added Base64URLEncoder and decoder for web safe alphabet from RFC
 4648, Section 5. Discussion at
 https://groups.google.com/d/msg/cryptopp-users/OF5RPXW-cHw/EDrOuA4-rRYJ

git-svn-id: svn://svn.code.sf.net/p/cryptopp/code/trunk/c5@563 57ff6487-cd31-0410-9ec3-f628ee90f5f0
---
 base64.cpp | 43 +++++++++++++++++++++++++++++++++++++++----
 base64.h   | 37 +++++++++++++++++++++++++++++++++----
 2 files changed, 72 insertions(+), 8 deletions(-)

diff --git a/base64.cpp b/base64.cpp
index 7571f2b..8289c0c 100644
--- a/base64.cpp
+++ b/base64.cpp
@@ -5,8 +5,13 @@
 
 NAMESPACE_BEGIN(CryptoPP)
 
-static const byte s_vec[] =
-		"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
+
+// Base64
+static const byte s_vec1[] =
+    "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
+// Base64URL
+static const byte s_vec2[] =
+    "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-_";
 static const byte s_padding = '=';
 
 void Base64Encoder::IsolatedInitialize(const NameValuePairs &parameters)
@@ -18,7 +23,24 @@ void Base64Encoder::IsolatedInitialize(const NameValuePairs &parameters)
 	
 	m_filter->Initialize(CombinedNameValuePairs(
 		parameters,
-		MakeParameters(Name::EncodingLookupArray(), &s_vec[0], false)
+		MakeParameters(Name::EncodingLookupArray(), &s_vec1[0], false)
+			(Name::PaddingByte(), s_padding)
+			(Name::GroupSize(), insertLineBreaks ? maxLineLength : 0)
+			(Name::Separator(), ConstByteArrayParameter(lineBreak))
+			(Name::Terminator(), ConstByteArrayParameter(lineBreak))
+			(Name::Log2Base(), 6, true)));
+}
+
+void Base64URLEncoder::IsolatedInitialize(const NameValuePairs &parameters)
+{
+	bool insertLineBreaks = parameters.GetValueWithDefault(Name::InsertLineBreaks(), true);
+	int maxLineLength = parameters.GetIntValueWithDefault(Name::MaxLineLength(), 72);
+    
+	const char *lineBreak = insertLineBreaks ? "\n" : "";
+	
+	m_filter->Initialize(CombinedNameValuePairs(
+		parameters,
+		MakeParameters(Name::EncodingLookupArray(), &s_vec2[0], false)
 			(Name::PaddingByte(), s_padding)
 			(Name::GroupSize(), insertLineBreaks ? maxLineLength : 0)
 			(Name::Separator(), ConstByteArrayParameter(lineBreak))
@@ -30,10 +52,23 @@ const int *Base64Decoder::GetDecodingLookupArray()
 {
 	static volatile bool s_initialized = false;
 	static int s_array[256];
+    
+	if (!s_initialized)
+	{
+		InitializeDecodingLookupArray(s_array, s_vec1, 64, false);
+		s_initialized = true;
+	}
+	return s_array;
+}
 
+const int *Base64URLDecoder::GetDecodingLookupArray()
+{
+	static volatile bool s_initialized = false;
+	static int s_array[256];
+    
 	if (!s_initialized)
 	{
-		InitializeDecodingLookupArray(s_array, s_vec, 64, false);
+		InitializeDecodingLookupArray(s_array, s_vec2, 64, false);
 		s_initialized = true;
 	}
 	return s_array;
diff --git a/base64.h b/base64.h
index 5a9e184..428b62c 100644
--- a/base64.h
+++ b/base64.h
@@ -5,7 +5,8 @@
 
 NAMESPACE_BEGIN(CryptoPP)
 
-//! Base64 Encoder Class 
+//! Base64 Encoder Class
+// https://tools.ietf.org/html/rfc4648#section-4
 class Base64Encoder : public SimpleProxyFilter
 {
 public:
@@ -14,19 +15,47 @@ public:
 	{
 		IsolatedInitialize(MakeParameters(Name::InsertLineBreaks(), insertLineBreaks)(Name::MaxLineLength(), maxLineLength));
 	}
-
+    
 	void IsolatedInitialize(const NameValuePairs &parameters);
 };
 
-//! Base64 Decoder Class 
+//! Base64 Decoder Class
+// https://tools.ietf.org/html/rfc4648#section-4
 class Base64Decoder : public BaseN_Decoder
 {
 public:
 	Base64Decoder(BufferedTransformation *attachment = NULL)
 		: BaseN_Decoder(GetDecodingLookupArray(), 6, attachment) {}
-
+    
 	void IsolatedInitialize(const NameValuePairs &parameters) {}
+    
+private:
+	static const int * CRYPTOPP_API GetDecodingLookupArray();
+};
+
+//! Base64 URL Encoder Class
+// https://tools.ietf.org/html/rfc4648#section-5
+class Base64URLEncoder : public SimpleProxyFilter
+{
+public:
+	Base64URLEncoder(BufferedTransformation *attachment = NULL, bool insertLineBreaks = false, int maxLineLength = -1)
+		: SimpleProxyFilter(new BaseN_Encoder(new Grouper), attachment)
+	{
+		IsolatedInitialize(MakeParameters(Name::InsertLineBreaks(), insertLineBreaks)(Name::MaxLineLength(), maxLineLength));
+	}
+    
+	void IsolatedInitialize(const NameValuePairs &parameters);
+};
 
+//! Base64 URL Decoder Class
+class Base64URLDecoder : public BaseN_Decoder
+{
+public:
+	Base64URLDecoder(BufferedTransformation *attachment = NULL)
+		: BaseN_Decoder(GetDecodingLookupArray(), 6, attachment) {}
+    
+	void IsolatedInitialize(const NameValuePairs &parameters) {}
+    
 private:
 	static const int * CRYPTOPP_API GetDecodingLookupArray();
 };
-- 
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