base64.cpp

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

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

NAMESPACE_BEGIN(CryptoPP)

namespace
{
        const byte s_stdVec[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
        const byte s_urlVec[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-_";
        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_stdVec[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_urlVec[0], false)
                        (Name::PaddingByte(), s_padding)
                        (Name::GroupSize(), insertLineBreaks ? maxLineLength : 0)
                        (Name::Separator(), ConstByteArrayParameter(lineBreak))
                        (Name::Terminator(), ConstByteArrayParameter(lineBreak))
                        (Name::Log2Base(), 6, true)));
}

void Base64Decoder::IsolatedInitialize(const NameValuePairs &parameters)
{
        BaseN_Decoder::IsolatedInitialize(CombinedNameValuePairs(
                parameters,
                MakeParameters(Name::DecodingLookupArray(), GetDecodingLookupArray(), false)(Name::Log2Base(), 6, true)));
}

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

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

void Base64URLDecoder::IsolatedInitialize(const NameValuePairs &parameters)
{
        BaseN_Decoder::IsolatedInitialize(CombinedNameValuePairs(
                parameters,
                MakeParameters(Name::DecodingLookupArray(), GetDecodingLookupArray(), false)(Name::Log2Base(), 6, true)));
}

const int *Base64URLDecoder::GetDecodingLookupArray()
{
        static volatile bool s_initialized = false;
        static int s_array[256];

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

NAMESPACE_END