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)));
}

const int *Base32Decoder::GetDefaultDecodingLookupArray()
{
        static volatile 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