add base 32 (Frank Palazzolo)

1 files changed, 39 insertions, 0 deletions

diff --git a/base32.cpp b/base32.cpp
new file mode 100644
index 00000000..56bce6e5
--- /dev/null
+++ b/base32.cpp
@@ -0,0 +1,39 @@
+// base32.cpp - written and placed in the public domain by Frank Palazzolo, based on hex.cpp by Wei Dai
+
+#include "pch.h"
+#include "base32.h"
+
+NAMESPACE_BEGIN(CryptoPP)
+
+static const byte s_vecUpper[] = "ABCDEFGHIJKMNPQRSTUVWXYZ23456789";
+static const byte s_vecLower[] = "abcdefghijkmnpqrstuvwxyz23456789";
+
+void Base32Encoder::IsolatedInitialize(const NameValuePairs &parameters)
+{
+	bool uppercase = parameters.GetValueWithDefault(Name::Uppercase(), true);
+	m_filter->Initialize(CombinedNameValuePairs(
+		parameters,
+		MakeParameters(Name::EncodingLookupArray(), uppercase ? &s_vecUpper[0] : &s_vecLower[0], false)(Name::Log2Base(), 5, true)));
+}
+
+void Base32Decoder::IsolatedInitialize(const NameValuePairs &parameters)
+{
+	BaseN_Decoder::Initialize(CombinedNameValuePairs(
+		parameters,
+		MakeParameters(Name::DecodingLookupArray(), GetDefaultDecodingLookupArray(), false)(Name::Log2Base(), 5, true)));
+}
+
+const int *Base32Decoder::GetDefaultDecodingLookupArray()
+{
+	static bool s_initialized = false;
+	static int s_array[256];
+
+	if (!s_initialized)
+	{
+		InitializeDecodingLookupArray(s_array, s_vecUpper, 32, true);
+		s_initialized = true;
+	}
+	return s_array;
+}
+
+NAMESPACE_END