Program Listing for File stringencoding.h

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//==================================================================================
// BSD 2-Clause License
//
// Copyright (c) 2014-2022, NJIT, Duality Technologies Inc. and other contributors
//
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// Author TPOC: contact@openfhe.org
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// 1. Redistributions of source code must retain the above copyright notice, this
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/*
  Represents and defines string-encoded plaintext objects in OpenFHE
 */

#ifndef SRC_CORE_LIB_ENCODING_STRINGENCODING_H_
#define SRC_CORE_LIB_ENCODING_STRINGENCODING_H_

#include "encoding/plaintext.h"

#include <memory>
#include <string>

namespace lbcrypto {

class StringEncoding : public PlaintextImpl {
    std::string ptx;
    // enum EncodingType { CHAR7bit } encoding = CHAR7bit;

public:
    // these three constructors are used inside of Decrypt
    template <typename T, typename std::enable_if<std::is_same<T, Poly::Params>::value ||
                                                      std::is_same<T, NativePoly::Params>::value ||
                                                      std::is_same<T, DCRTPoly::Params>::value,
                                                  bool>::type = true>
    StringEncoding(std::shared_ptr<T> vp, EncodingParams ep) : PlaintextImpl(vp, ep, STRING_ENCODING) {}

    template <typename T, typename std::enable_if<std::is_same<T, Poly::Params>::value ||
                                                      std::is_same<T, NativePoly::Params>::value ||
                                                      std::is_same<T, DCRTPoly::Params>::value,
                                                  bool>::type = true>
    StringEncoding(std::shared_ptr<T> vp, EncodingParams ep, const std::string& str)
        : PlaintextImpl(vp, ep, STRING_ENCODING), ptx(str) {}

    // TODO provide wide-character version (for unicode); right now this class
    // only supports strings of 7-bit ASCII characters

    ~StringEncoding() override = default;

    const std::string& GetStringValue() const override {
        return ptx;
    }

    void SetStringValue(const std::string& value) override {
        ptx = value;
    }

    bool Encode() override;

    bool Decode() override;

    size_t GetLength() const override {
        return ptx.size();
    }

protected:
    bool CompareTo(const PlaintextImpl& rhs) const override {
        if (typeid(rhs) != typeid(StringEncoding))
            return false;

        const auto& el = static_cast<const StringEncoding&>(rhs);
        return ptx == el.ptx;
    }

    void PrintValue(std::ostream& out) const override {
        out << ptx;
    }
};

} /* namespace lbcrypto */

#endif /* SRC_CORE_LIB_ENCODING_STRINGENCODING_H_ */