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@ -15,24 +15,37 @@ enum Version
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VER_13 = 0x3fa66666
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};
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/* A structure used for holding fixed-length strings. In the case of
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LEN=4, it can be more efficient to match the string as a 32 bit
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number, therefore the struct is implemented as a union with an int.
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*/
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template <int LEN>
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union NAME_T
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// CRTP for FIXED_STRING class, a structure used for holding fixed-length strings
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template< template<size_t> class DERIVED, size_t SIZE>
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class FIXED_STRING_BASE
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{
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char name[LEN];
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uint32_t val;
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/* The following methods must be implemented in derived classes:
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* char const* ro_data() const; // return pointer to ro buffer
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* char* rw_data(); // return pointer to rw buffer
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*/
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public:
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enum { size = SIZE };
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bool operator==(const char *str) const
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template<size_t OTHER_SIZE>
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bool operator==(char const (&str)[OTHER_SIZE]) const
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{
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size_t other_len = strnlen(str, OTHER_SIZE);
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if (other_len != this->length())
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return false;
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return std::strncmp(self()->ro_data(), str, size) == 0;
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}
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bool operator==(const char* const str) const
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{
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char const* const data = self()->ro_data();
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for(size_t i = 0; i < size; ++i)
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{
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for(int i=0; i<LEN; i++)
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if(name[i] != str[i]) return false;
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else if(name[i] == 0) return true;
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return str[LEN] == 0;
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if(data[i] != str[i]) return false;
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else if(data[i] == '\0') return true;
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}
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bool operator!=(const char *str) const { return !((*this)==str); }
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return str[size] == '\0';
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}
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bool operator!=(const char* const str) const { return !( (*this) == str ); }
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bool operator==(const std::string& str) const
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{
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@ -40,18 +53,60 @@ union NAME_T
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}
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bool operator!=(const std::string& str) const { return !( (*this) == str ); }
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bool operator==(uint32_t v) const { return v == val; }
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bool operator!=(uint32_t v) const { return v != val; }
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size_t data_size() const { return size; }
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size_t length() const { return strnlen(self()->ro_data(), size); }
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std::string toString() const { return std::string(self()->ro_data(), this->length()); }
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void assign(const std::string& value) { std::strncpy(self()->rw_data(), value.c_str(), size); }
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void clear() { this->assign(""); }
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private:
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DERIVED<size> const* self() const
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{
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return static_cast<DERIVED<size> const*>(this);
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}
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// write the non-const version in terms of the const version
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// Effective C++ 3rd ed., Item 3 (p. 24-25)
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DERIVED<size>* self()
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{
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return const_cast<DERIVED<size>*>(static_cast<FIXED_STRING_BASE const*>(this)->self());
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}
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};
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// Generic implementation
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template <size_t SIZE>
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struct FIXED_STRING : public FIXED_STRING_BASE<FIXED_STRING, SIZE>
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{
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char data[SIZE];
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char const* ro_data() const { return data; }
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char* rw_data() { return data; }
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};
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// In the case of SIZE=4, it can be more efficient to match the string
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// as a 32 bit number, therefore the struct is implemented as a union with an int.
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template <>
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struct FIXED_STRING<4> : public FIXED_STRING_BASE<FIXED_STRING, 4>
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{
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union {
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char data[4];
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uint32_t intval;
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};
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using FIXED_STRING_BASE::operator==;
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using FIXED_STRING_BASE::operator!=;
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std::string toString() const { return std::string(name, strnlen(name, LEN)); }
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bool operator==(uint32_t v) const { return v == intval; }
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bool operator!=(uint32_t v) const { return v != intval; }
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void assign (const std::string& value) { std::strncpy (name, value.c_str(), LEN); }
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char const* ro_data() const { return data; }
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char* rw_data() { return data; }
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};
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typedef NAME_T<4> NAME;
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typedef NAME_T<32> NAME32;
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typedef NAME_T<64> NAME64;
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typedef NAME_T<256> NAME256;
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typedef FIXED_STRING<4> NAME;
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typedef FIXED_STRING<32> NAME32;
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typedef FIXED_STRING<64> NAME64;
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typedef FIXED_STRING<256> NAME256;
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/* This struct defines a file 'context' which can be saved and later
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restored by an ESMReader instance. It will save the position within
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Roman Proskuryakov
9 years ago
committed by
Roman Proskuryakov