basecode.h

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// basecode.h - written and placed in the public domain by Wei Dai


#ifndef CRYPTOPP_BASECODE_H
#define CRYPTOPP_BASECODE_H

#include "cryptlib.h"
#include "filters.h"
#include "algparam.h"
#include "argnames.h"

NAMESPACE_BEGIN(CryptoPP)

class CRYPTOPP_DLL BaseN_Encoder : public Unflushable<Filter>
{
public:
        BaseN_Encoder(BufferedTransformation *attachment=NULL)
                : m_alphabet(NULL), m_padding(0), m_bitsPerChar(0)
                , m_outputBlockSize(0), m_bytePos(0), m_bitPos(0)
                        {Detach(attachment);}

        BaseN_Encoder(const byte *alphabet, int log2base, BufferedTransformation *attachment=NULL, int padding=-1)
                : m_alphabet(NULL), m_padding(0), m_bitsPerChar(0)
                , m_outputBlockSize(0), m_bytePos(0), m_bitPos(0)
        {
                Detach(attachment);
                IsolatedInitialize(MakeParameters(Name::EncodingLookupArray(), alphabet)
                        (Name::Log2Base(), log2base)
                        (Name::Pad(), padding != -1)
                        (Name::PaddingByte(), byte(padding)));
        }

        void IsolatedInitialize(const NameValuePairs &parameters);
        size_t Put2(const byte *begin, size_t length, int messageEnd, bool blocking);

private:
        const byte *m_alphabet;
        int m_padding, m_bitsPerChar, m_outputBlockSize;
        int m_bytePos, m_bitPos;
        SecByteBlock m_outBuf;
};

class CRYPTOPP_DLL BaseN_Decoder : public Unflushable<Filter>
{
public:
        BaseN_Decoder(BufferedTransformation *attachment=NULL)
                : m_lookup(0), m_padding(0), m_bitsPerChar(0)
                , m_outputBlockSize(0), m_bytePos(0), m_bitPos(0)
                        {Detach(attachment);}

        BaseN_Decoder(const int *lookup, int log2base, BufferedTransformation *attachment=NULL)
                : m_lookup(0), m_padding(0), m_bitsPerChar(0)
                , m_outputBlockSize(0), m_bytePos(0), m_bitPos(0)
        {
                Detach(attachment);
                IsolatedInitialize(MakeParameters(Name::DecodingLookupArray(), lookup)(Name::Log2Base(), log2base));
        }

        void IsolatedInitialize(const NameValuePairs &parameters);
        size_t Put2(const byte *begin, size_t length, int messageEnd, bool blocking);

        static void CRYPTOPP_API InitializeDecodingLookupArray(int *lookup, const byte *alphabet, unsigned int base, bool caseInsensitive);

private:
        const int *m_lookup;
        int m_padding, m_bitsPerChar, m_outputBlockSize;
        int m_bytePos, m_bitPos;
        SecByteBlock m_outBuf;
};

class CRYPTOPP_DLL Grouper : public Bufferless<Filter>
{
public:
        Grouper(BufferedTransformation *attachment=NULL)
                : m_groupSize(0), m_counter(0) {Detach(attachment);}

        Grouper(int groupSize, const std::string &separator, const std::string &terminator, BufferedTransformation *attachment=NULL)
                : m_groupSize(0), m_counter(0)
        {
                Detach(attachment);
                IsolatedInitialize(MakeParameters(Name::GroupSize(), groupSize)
                        (Name::Separator(), ConstByteArrayParameter(separator))
                        (Name::Terminator(), ConstByteArrayParameter(terminator)));
        }

        void IsolatedInitialize(const NameValuePairs &parameters);
        size_t Put2(const byte *begin, size_t length, int messageEnd, bool blocking);

private:
        SecByteBlock m_separator, m_terminator;
        size_t m_groupSize, m_counter;
};

NAMESPACE_END

#endif