base64.cpp

// base64.cpp - written and placed in the public domain by Wei Dai

#include "pch.h"
#include "base64.h"

NAMESPACE_BEGIN(CryptoPP)

static const byte s_vec[] =
                "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
static const byte s_padding = '=';

void Base64Encoder::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_vec[0], false)
                        (Name::PaddingByte(), s_padding)
                        (Name::GroupSize(), insertLineBreaks ? maxLineLength : 0)
                        (Name::Separator(), ConstByteArrayParameter(lineBreak))
                        (Name::Terminator(), ConstByteArrayParameter(lineBreak))
                        (Name::Log2Base(), 6, true)));
}

const int *Base64Decoder::GetDecodingLookupArray()
{
        static bool s_initialized = false;
        static int s_array[256];

        if (!s_initialized)
        {
                InitializeDecodingLookupArray(s_array, s_vec, 64, false);
                s_initialized = true;
        }
        return s_array;
}

NAMESPACE_END

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