base32.cpp


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// 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)

namespace
{
	const byte s_vecUpper[] = "ABCDEFGHIJKMNPQRSTUVWXYZ23456789";
	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::IsolatedInitialize(CombinedNameValuePairs(
		parameters,
		MakeParameters(Name::DecodingLookupArray(), GetDefaultDecodingLookupArray(), false)(Name::Log2Base(), 5, true)));
}

ANONYMOUS_NAMESPACE_BEGIN
static const int s_array[256] = {
	-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
	-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
	-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
	-1, -1, 24, 25, 26, 27, 28, 29, 30, 31, -1, -1, -1, -1, -1, -1,
	-1,  0,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, -1, 11, 12, -1,
	13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, -1, -1, -1, -1, -1,
	-1,  0,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, -1, 11, 12, -1,
	13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, -1, -1, -1, -1, -1,
	-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
	-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
	-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
	-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
	-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
	-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
	-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
	-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1
};
NAMESPACE_END

// Unrolled initialization, http://github.com/weidai11/cryptopp/issues/376
const int *Base32Decoder::GetDefaultDecodingLookupArray()
{
	return s_array;
}

NAMESPACE_END