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# algparam.h

    00001 #ifndef CRYPTOPP_ALGPARAM_H
    00002 #define CRYPTOPP_ALGPARAM_H
    00003
    00004 #include "cryptlib.h"
    00005 #include "smartptr.h"
    00006 #include "secblock.h"
    00007
    00008 NAMESPACE_BEGIN(CryptoPP)
    00009
    00010 //! used to pass byte array input as part of a NameValuePairs object
    00011 /*! the deepCopy option is used when the NameValuePairs object can't
    00012         keep a copy of the data available */
    00013 class ConstByteArrayParameter
    00014 {
    00015 public:
    00016         ConstByteArrayParameter(const char *data = NULL, bool deepCopy = false)
    00017         {
    00018                 Assign((const byte *)data, data ? strlen(data) : 0, deepCopy);
    00019         }
    00020         ConstByteArrayParameter(const byte *data, size_t size, bool deepCopy = false)
    00021         {
    00022                 Assign(data, size, deepCopy);
    00023         }
    00024         template <class T> ConstByteArrayParameter(const T &string, bool deepCopy = false)
    00025         {
    00026         CRYPTOPP_COMPILE_ASSERT(sizeof(CPP_TYPENAME T::value_type) == 1);
    00027                 Assign((const byte *)string.data(), string.size(), deepCopy);
    00028         }
    00029
    00030         void Assign(const byte *data, size_t size, bool deepCopy)
    00031         {
    00032                 if (deepCopy)
    00033                         m_block.Assign(data, size);
    00034                 else
    00035                 {
    00036                         m_data = data;
    00037                         m_size = size;
    00038                 }
    00039                 m_deepCopy = deepCopy;
    00040         }
    00041
    00042         const byte *begin() const {return m_deepCopy ? m_block.begin() : m_data;}
    00043         const byte *end() const {return m_deepCopy ? m_block.end() : m_data + m_size;}
    00044         size_t size() const {return m_deepCopy ? m_block.size() : m_size;}
    00045
    00046 private:
    00047         bool m_deepCopy;
    00048         const byte *m_data;
    00049         size_t m_size;
    00050         SecByteBlock m_block;
    00051 };
    00052
    00053 class ByteArrayParameter
    00054 {
    00055 public:
    00056         ByteArrayParameter(byte *data = NULL, unsigned int size = 0)
    00057                 : m_data(data), m_size(size) {}
    00058         ByteArrayParameter(SecByteBlock &block)
    00059                 : m_data(block.begin()), m_size(block.size()) {}
    00060
    00061         byte *begin() const {return m_data;}
    00062         byte *end() const {return m_data + m_size;}
    00063         size_t size() const {return m_size;}
    00064
    00065 private:
    00066         byte *m_data;
    00067         size_t m_size;
    00068 };
    00069
    00070 class CRYPTOPP_DLL CombinedNameValuePairs : public NameValuePairs
    00071 {
    00072 public:
    00073         CombinedNameValuePairs(const NameValuePairs &pairs1, const NameValuePairs &pairs2)
    00074                 : m_pairs1(pairs1), m_pairs2(pairs2) {}
    00075
    00076         bool GetVoidValue(const char *name, const std::type_info &valueType, void *pValue) const;
    00077
    00078 private:
    00079         const NameValuePairs &m_pairs1, &m_pairs2;
    00080 };
    00081
    00082 template <class T, class BASE>
    00083 class GetValueHelperClass
    00084 {
    00085 public:
    00086         GetValueHelperClass(const T *pObject, const char *name, const std::type_info &valueType, void *pValue, const NameValuePairs *searchFirst)
    00087                 : m_pObject(pObject), m_name(name), m_valueType(&valueType), m_pValue(pValue), m_found(false), m_getValueNames(false)
    00088         {
    00089                 if (strcmp(m_name, "ValueNames") == 0)
    00090                 {
    00091                         m_found = m_getValueNames = true;
    00092                         NameValuePairs::ThrowIfTypeMismatch(m_name, typeid(std::string), *m_valueType);
    00093                         if (searchFirst)
    00094                                 searchFirst->GetVoidValue(m_name, valueType, pValue);
    00095                         if (typeid(T) != typeid(BASE))
    00096                                 pObject->BASE::GetVoidValue(m_name, valueType, pValue);
    00097                         ((*reinterpret_cast<std::string *>(m_pValue) += "ThisPointer:") += typeid(T).name()) += ';';
    00098                 }
    00099
    00100                 if (!m_found && strncmp(m_name, "ThisPointer:", 12) == 0 && strcmp(m_name+12, typeid(T).name()) == 0)
    00101                 {
    00102                         NameValuePairs::ThrowIfTypeMismatch(m_name, typeid(T *), *m_valueType);
    00103                         *reinterpret_cast<const T **>(pValue) = pObject;
    00104                         m_found = true;
    00105                         return;
    00106                 }
    00107
    00108                 if (!m_found && searchFirst)
    00109                         m_found = searchFirst->GetVoidValue(m_name, valueType, pValue);
    00110
    00111                 if (!m_found && typeid(T) != typeid(BASE))
    00112                         m_found = pObject->BASE::GetVoidValue(m_name, valueType, pValue);
    00113         }
    00114
    00115         operator bool() const {return m_found;}
    00116
    00117         template <class R>
    00118         GetValueHelperClass<T,BASE> & operator()(const char *name, const R & (T::*pm)() const)
    00119         {
    00120                 if (m_getValueNames)
    00121                         (*reinterpret_cast<std::string *>(m_pValue) += name) += ";";
    00122                 if (!m_found && strcmp(name, m_name) == 0)
    00123                 {
    00124                         NameValuePairs::ThrowIfTypeMismatch(name, typeid(R), *m_valueType);
    00125                         *reinterpret_cast<R *>(m_pValue) = (m_pObject->*pm)();
    00126                         m_found = true;
    00127                 }
    00128                 return *this;
    00129         }
    00130
    00131         GetValueHelperClass<T,BASE> &Assignable()
    00132         {
    00133 #ifndef __INTEL_COMPILER        // ICL 9.1 workaround: Intel compiler copies the vTable pointer for some reason
    00134                 if (m_getValueNames)
    00135                         ((*reinterpret_cast<std::string *>(m_pValue) += "ThisObject:") += typeid(T).name()) += ';';
    00136                 if (!m_found && strncmp(m_name, "ThisObject:", 11) == 0 && strcmp(m_name+11, typeid(T).name()) == 0)
    00137                 {
    00138                         NameValuePairs::ThrowIfTypeMismatch(m_name, typeid(T), *m_valueType);
    00139                         *reinterpret_cast<T *>(m_pValue) = *m_pObject;
    00140                         m_found = true;
    00141                 }
    00142 #endif
    00143                 return *this;
    00144         }
    00145
    00146 private:
    00147         const T *m_pObject;
    00148         const char *m_name;
    00149         const std::type_info *m_valueType;
    00150         void *m_pValue;
    00151         bool m_found, m_getValueNames;
    00152 };
    00153
    00154 template <class BASE, class T>
    00155 GetValueHelperClass<T, BASE> GetValueHelper(const T *pObject, const char *name, const std::type_info &valueType, void *pValue, const NameValuePairs *searchFirst=NULL, BASE *dummy=NULL)
    00156 {
    00157         return GetValueHelperClass<T, BASE>(pObject, name, valueType, pValue, searchFirst);
    00158 }
    00159
    00160 template <class T>
    00161 GetValueHelperClass<T, T> GetValueHelper(const T *pObject, const char *name, const std::type_info &valueType, void *pValue, const NameValuePairs *searchFirst=NULL)
    00162 {
    00163         return GetValueHelperClass<T, T>(pObject, name, valueType, pValue, searchFirst);
    00164 }
    00165
    00166 // ********************************************************
    00167
    00168 template <class R>
    00169 R Hack_DefaultValueFromConstReferenceType(const R &)
    00170 {
    00171         return R();
    00172 }
    00173
    00174 template <class R>
    00175 bool Hack_GetValueIntoConstReference(const NameValuePairs &source, const char *name, const R &value)
    00176 {
    00177         return source.GetValue(name, const_cast<R &>(value));
    00178 }
    00179
    00180 template <class T, class BASE>
    00181 class AssignFromHelperClass
    00182 {
    00183 public:
    00184         AssignFromHelperClass(T *pObject, const NameValuePairs &source)
    00185                 : m_pObject(pObject), m_source(source), m_done(false)
    00186         {
    00187                 if (source.GetThisObject(*pObject))
    00188                         m_done = true;
    00189                 else if (typeid(BASE) != typeid(T))
    00190                         pObject->BASE::AssignFrom(source);
    00191         }
    00192
    00193         template <class R>
    00194         AssignFromHelperClass & operator()(const char *name, void (T::*pm)(R))  // VC60 workaround: "const R &" here causes compiler error
    00195         {
    00196                 if (!m_done)
    00197                 {
    00198                         R value = Hack_DefaultValueFromConstReferenceType(reinterpret_cast<R>(*(int *)NULL));
    00199                         if (!Hack_GetValueIntoConstReference(m_source, name, value))
    00200                                 throw InvalidArgument(std::string(typeid(T).name()) + ": Missing required parameter '" + name + "'");
    00201                         (m_pObject->*pm)(value);
    00202                 }
    00203                 return *this;
    00204         }
    00205
    00206         template <class R, class S>
    00207         AssignFromHelperClass & operator()(const char *name1, const char *name2, void (T::*pm)(R, S))   // VC60 workaround: "const R &" here causes compiler error
    00208         {
    00209                 if (!m_done)
    00210                 {
    00211                         R value1 = Hack_DefaultValueFromConstReferenceType(reinterpret_cast<R>(*(int *)NULL));
    00212                         if (!Hack_GetValueIntoConstReference(m_source, name1, value1))
    00213                                 throw InvalidArgument(std::string(typeid(T).name()) + ": Missing required parameter '" + name1 + "'");
    00214                         S value2 = Hack_DefaultValueFromConstReferenceType(reinterpret_cast<S>(*(int *)NULL));
    00215                         if (!Hack_GetValueIntoConstReference(m_source, name2, value2))
    00216                                 throw InvalidArgument(std::string(typeid(T).name()) + ": Missing required parameter '" + name2 + "'");
    00217                         (m_pObject->*pm)(value1, value2);
    00218                 }
    00219                 return *this;
    00220         }
    00221
    00222 private:
    00223         T *m_pObject;
    00224         const NameValuePairs &m_source;
    00225         bool m_done;
    00226 };
    00227
    00228 template <class BASE, class T>
    00229 AssignFromHelperClass<T, BASE> AssignFromHelper(T *pObject, const NameValuePairs &source, BASE *dummy=NULL)
    00230 {
    00231         return AssignFromHelperClass<T, BASE>(pObject, source);
    00232 }
    00233
    00234 template <class T>
    00235 AssignFromHelperClass<T, T> AssignFromHelper(T *pObject, const NameValuePairs &source)
    00236 {
    00237         return AssignFromHelperClass<T, T>(pObject, source);
    00238 }
    00239
    00240 // ********************************************************
    00241
    00242 // to allow the linker to discard Integer code if not needed.
    00243 typedef bool (CRYPTOPP_API * PAssignIntToInteger)(const std::type_info &valueType, void *pInteger, const void *pInt);
    00244 CRYPTOPP_DLL extern PAssignIntToInteger g_pAssignIntToInteger;
    00245
    00246 CRYPTOPP_DLL const std::type_info & CRYPTOPP_API IntegerTypeId();
    00247
    00248 class CRYPTOPP_DLL AlgorithmParametersBase : public NameValuePairs
    00249 {
    00250 public:
    00251         class ParameterNotUsed : public Exception
    00252         {
    00253         public:
    00254                 ParameterNotUsed(const char *name) : Exception(OTHER_ERROR, std::string("AlgorithmParametersBase: parameter \"") + name + "\" not used") {}
    00255         };
    00256
    00257         AlgorithmParametersBase(const char *name, bool throwIfNotUsed)
    00258                 : m_name(name), m_throwIfNotUsed(throwIfNotUsed), m_used(false) {}
    00259
    00260         ~AlgorithmParametersBase()
    00261         {
    00262 #ifdef CRYPTOPP_UNCAUGHT_EXCEPTION_AVAILABLE
    00263                 if (!std::uncaught_exception())
    00264 #else
    00265                 try
    00266 #endif
    00267                 {
    00268                         if (m_throwIfNotUsed && !m_used)
    00269                                 throw ParameterNotUsed(m_name);
    00270                 }
    00271 #ifndef CRYPTOPP_UNCAUGHT_EXCEPTION_AVAILABLE
    00272                 catch(...)
    00273                 {
    00274                 }
    00275 #endif
    00276         }
    00277
    00278         bool GetVoidValue(const char *name, const std::type_info &valueType, void *pValue) const;
    00279
    00280 protected:
    00281         virtual void AssignValue(const char *name, const std::type_info &valueType, void *pValue) const =0;
    00282         virtual const NameValuePairs & GetParent() const =0;
    00283
    00284         const char *m_name;
    00285         bool m_throwIfNotUsed;
    00286         mutable bool m_used;
    00287 };
    00288
    00289 template <class T>
    00290 class AlgorithmParametersBase2 : public AlgorithmParametersBase
    00291 {
    00292 public:
    00293         AlgorithmParametersBase2(const char *name, const T &value, bool throwIfNotUsed) : AlgorithmParametersBase(name, throwIfNotUsed), m_value(value) {}
    00294
    00295         void AssignValue(const char *name, const std::type_info &valueType, void *pValue) const
    00296         {
    00297                 // special case for retrieving an Integer parameter when an int was passed in
    00298                 if (!(g_pAssignIntToInteger != NULL && typeid(T) == typeid(int) && g_pAssignIntToInteger(valueType, pValue, &m_value)))
    00299                 {
    00300                         ThrowIfTypeMismatch(name, typeid(T), valueType);
    00301                         *reinterpret_cast<T *>(pValue) = m_value;
    00302                 }
    00303         }
    00304
    00305 protected:
    00306         T m_value;
    00307 };
    00308
    00309 template <class PARENT, class T>
    00310 class AlgorithmParameters : public AlgorithmParametersBase2<T>
    00311 {
    00312 public:
    00313         AlgorithmParameters(const PARENT &parent, const char *name, const T &value, bool throwIfNotUsed)
    00314                 : AlgorithmParametersBase2<T>(name, value, throwIfNotUsed), m_parent(parent)
    00315         {}
    00316
    00317         AlgorithmParameters(const AlgorithmParameters &copy)
    00318                 : AlgorithmParametersBase2<T>(copy), m_parent(copy.m_parent)
    00319         {
    00320                 copy.m_used = true;
    00321         }
    00322
    00323         template <class R>
    00324         AlgorithmParameters<AlgorithmParameters<PARENT,T>, R> operator()(const char *name, const R &value) const
    00325         {
    00326                 return AlgorithmParameters<AlgorithmParameters<PARENT,T>, R>(*this, name, value, this->m_throwIfNotUsed);
    00327         }
    00328
    00329         template <class R>
    00330         AlgorithmParameters<AlgorithmParameters<PARENT,T>, R> operator()(const char *name, const R &value, bool throwIfNotUsed) const
    00331         {
    00332                 return AlgorithmParameters<AlgorithmParameters<PARENT,T>, R>(*this, name, value, throwIfNotUsed);
    00333         }
    00334
    00335 private:
    00336         const NameValuePairs & GetParent() const {return m_parent;}
    00337         PARENT m_parent;
    00338 };
    00339
    00340 //! Create an object that implements NameValuePairs for passing parameters
    00341 /*! \param throwIfNotUsed if true, the object will throw an exception if the value is not accessed
    00342         \note throwIfNotUsed is ignored if using a compiler that does not support std::uncaught_exception(),
    00343         such as MSVC 7.0 and earlier.
    00344         \note A NameValuePairs object containing an arbitrary number of name value pairs may be constructed by
    00345         repeatedly using operator() on the object returned by MakeParameters, for example:
    00346         const NameValuePairs &parameters = MakeParameters(name1, value1)(name2, value2)(name3, value3);
    00347 */
    00348 template <class T>
    00349 AlgorithmParameters<NullNameValuePairs,T> MakeParameters(const char *name, const T &value, bool throwIfNotUsed = true)
    00350 {
    00351         return AlgorithmParameters<NullNameValuePairs,T>(g_nullNameValuePairs, name, value, throwIfNotUsed);
    00352 }
    00353
    00354 #define CRYPTOPP_GET_FUNCTION_ENTRY(name)               (Name::name(), &ThisClass::Get##name)
    00355 #define CRYPTOPP_SET_FUNCTION_ENTRY(name)               (Name::name(), &ThisClass::Set##name)
    00356 #define CRYPTOPP_SET_FUNCTION_ENTRY2(name1, name2)      (Name::name1(), Name::name2(), &ThisClass::Set##name1##And##name2)
    00357
    00358 NAMESPACE_END
    00359
    00360 #endif