| 1 | // [License]
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| 2 | // The Ariba-Underlay Copyright
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| 3 | //
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| 4 | // Copyright (c) 2008-2009, Institute of Telematics, UniversitÀt Karlsruhe (TH)
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| 5 | //
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| 6 | // Institute of Telematics
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| 7 | // UniversitÀt Karlsruhe (TH)
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| 8 | // Zirkel 2, 76128 Karlsruhe
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| 9 | // Germany
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| 10 | //
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| 11 | // Redistribution and use in source and binary forms, with or without
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| 12 | // modification, are permitted provided that the following conditions are
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| 13 | // met:
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| 14 | //
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| 15 | // 1. Redistributions of source code must retain the above copyright
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| 16 | // notice, this list of conditions and the following disclaimer.
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| 17 | // 2. Redistributions in binary form must reproduce the above copyright
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| 18 | // notice, this list of conditions and the following disclaimer in the
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| 19 | // documentation and/or other materials provided with the distribution.
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| 20 | //
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| 21 | // THIS SOFTWARE IS PROVIDED BY THE INSTITUTE OF TELEMATICS ``AS IS'' AND
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| 22 | // ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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| 23 | // IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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| 24 | // PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE ARIBA PROJECT OR
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| 25 | // CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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| 26 | // EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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| 27 | // PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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| 28 | // PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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| 29 | // LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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| 30 | // NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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| 31 | // SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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| 32 | //
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| 33 | // The views and conclusions contained in the software and documentation
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| 34 | // are those of the authors and should not be interpreted as representing
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| 35 | // official policies, either expressed or implied, of the Institute of
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| 36 | // Telematics.
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| 37 | // [License]
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| 38 |
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| 39 | #ifndef IDENTIFIER_H_
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| 40 | #define IDENTIFIER_H_
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| 41 |
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| 42 | #include <memory>
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| 43 | #include <string>
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| 44 | #include <cassert>
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| 45 | #include <iostream>
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| 46 | #include <gmp.h>
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| 47 | #include <boost/cstdint.hpp>
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| 48 | #include "ariba/utility/logging/Logging.h"
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| 49 | #include "ariba/utility/types/Address.h"
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| 50 | #include "ariba/utility/serialization.h"
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| 51 |
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| 52 | /**< maximum length of the key */
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| 53 | #define MAX_KEYLENGTH 192
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| 54 |
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| 55 | namespace ariba {
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| 56 | namespace utility {
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| 57 |
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| 58 | using_serialization;
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| 59 |
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| 60 | class IdentifierBit;
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| 61 |
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| 62 | /**
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| 63 | * An abstract address class for identifier.<br/>
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| 64 | *
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| 65 | * This class is the base for all identifier classes.
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| 66 | */
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| 67 | class Identifier: public Address {
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| 68 | VSERIALIZEABLE;
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| 69 | use_logging_h( Identifier );
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| 70 | public:
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| 71 |
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| 72 | //-------------------------------------------------------------------------
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| 73 | // virtual function from Address
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| 74 | //-------------------------------------------------------------------------
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| 75 |
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| 76 | virtual void clearAddress();
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| 77 | virtual bool setAddress(string address);
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| 78 | virtual string getAddress() const;
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| 79 |
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| 80 | //-------------------------------------------------------------------------
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| 81 | // constants
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| 82 | //-------------------------------------------------------------------------
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| 83 |
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| 84 | static const Identifier UNSPECIFIED_KEY; /**< Identifier without defined key */
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| 85 | static const Identifier ZERO; /**< Identifier with key initialized as 0 */
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| 86 | static const Identifier ONE; /**< Identifier with key initialized as 1 */
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| 87 |
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| 88 | //-------------------------------------------------------------------------
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| 89 | // construction and destruction
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| 90 | //-------------------------------------------------------------------------
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| 91 |
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| 92 | /**
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| 93 | * Default constructor
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| 94 | *
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| 95 | * Contructs an unspecified overlay key
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| 96 | */
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| 97 | Identifier();
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| 98 |
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| 99 | /**
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| 100 | * Constructs an overlay key initialized with a common integer
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| 101 | *
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| 102 | * @param num The integer to initialize this key with
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| 103 | */
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| 104 | Identifier(uint32_t num);
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| 105 |
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| 106 | /**
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| 107 | * Constructs a key out of a buffer
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| 108 | * @param buffer Source buffer
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| 109 | * @param size Buffer size (in bytes)
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| 110 | */
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| 111 | Identifier(const unsigned char* buffer, uint size);
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| 112 |
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| 113 | /**
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| 114 | * Constructs a key out of a string number.
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| 115 | */
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| 116 | Identifier(const std::string& str, uint base = 16);
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| 117 |
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| 118 | /**
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| 119 | * Copy constructor.
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| 120 | *
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| 121 | * @param rhs The key to copy.
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| 122 | */
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| 123 | Identifier(const Identifier& rhs);
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| 124 |
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| 125 | /**
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| 126 | * Default destructor.
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| 127 | *
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| 128 | * Does nothing ATM.
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| 129 | */
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| 130 | virtual ~Identifier();
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| 131 |
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| 132 | //-------------------------------------------------------------------------
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| 133 | // string representations & node key attributes
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| 134 | //-------------------------------------------------------------------------
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| 135 |
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| 136 | /**
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| 137 | * Returns a string representation of this key
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| 138 | *
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| 139 | * @return String representation of this key
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| 140 | */
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| 141 | virtual std::string toString(uint base = 16) const;
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| 142 |
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| 143 | /**
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| 144 | * Common stdc++ console output method
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| 145 | */
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| 146 | friend std::ostream& operator<<(std::ostream& os, const Identifier& c);
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| 147 |
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| 148 | /**
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| 149 | * Returns true, if the key is unspecified
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| 150 | *
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| 151 | * @return Returns true, if key is unspecified
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| 152 | */
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| 153 | bool isUnspecified() const;
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| 154 |
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| 155 | //-------------------------------------------------------------------------
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| 156 | // operators
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| 157 | //-------------------------------------------------------------------------
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| 158 |
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| 159 | /**
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| 160 | * compares this to a given Identifier
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| 161 | *
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| 162 | * @param compKey the the Identifier to compare this to
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| 163 | * @return true if compKey->key is smaller than this->key, else false
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| 164 | */
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| 165 | bool operator<(const Identifier& compKey) const;
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| 166 |
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| 167 | /**
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| 168 | * compares this to a given Identifier
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| 169 | *
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| 170 | * @param compKey the the Identifier to compare this to
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| 171 | * @return true if compKey->key is greater than this->key, else false
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| 172 | */
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| 173 | bool operator>(const Identifier& compKey) const;
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| 174 |
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| 175 | /**
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| 176 | * compares this to a given Identifier
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| 177 | *
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| 178 | * @param compKey the the Identifier to compare this to
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| 179 | * @return true if compKey->key is smaller than or equal to this->key, else false
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| 180 | */
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| 181 | bool operator<=(const Identifier& compKey) const;
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| 182 |
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| 183 | /**
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| 184 | * compares this to a given Identifier
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| 185 | *
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| 186 | * @param compKey the the Identifier to compare this to
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| 187 | * @return true if compKey->key is greater than or equal to this->key, else false
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| 188 | */
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| 189 | bool operator>=(const Identifier& compKey) const;
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| 190 |
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| 191 | /**
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| 192 | * compares this to a given Identifier
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| 193 | *
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| 194 | * @param compKey the the Identifier to compare this to
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| 195 | * @return true if compKey->key is equal to this->key, else false
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| 196 | */
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| 197 | bool operator==(const Identifier& compKey) const;
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| 198 |
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| 199 | /**
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| 200 | * compares this to a given Identifier
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| 201 | *
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| 202 | * @param compKey the the Identifier to compare this to
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| 203 | * @return true if compKey->key is not equal to this->key, else false
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| 204 | */
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| 205 | bool operator!=(const Identifier& compKey) const;
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| 206 |
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| 207 | /**
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| 208 | * Unifies all compare operations in one method
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| 209 | *
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| 210 | * @param compKey key to compare with
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| 211 | * @return int -1 if smaller, 0 if equal, 1 if greater
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| 212 | */
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| 213 | int compareTo(const Identifier& compKey) const;
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| 214 |
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| 215 | /**
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| 216 | * assigns Identifier of rhs to this->key
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| 217 | *
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| 218 | * @param rhs the Identifier with the defined key
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| 219 | * @return this Identifier object
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| 220 | */
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| 221 | Identifier& operator=(const Identifier& rhs);
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| 222 |
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| 223 | /**
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| 224 | * substracts 1 from this->key
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| 225 | *
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| 226 | * @return this Identifier object
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| 227 | */
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| 228 | Identifier& operator--();
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| 229 |
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| 230 | /**
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| 231 | * adds 1 to this->key
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| 232 | *
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| 233 | * @return this Identifier object
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| 234 | */
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| 235 | Identifier& operator++();
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| 236 |
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| 237 | /**
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| 238 | * adds rhs->key to this->key
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| 239 | *
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| 240 | * @param rhs the Identifier with the defined key
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| 241 | * @return this Identifier object
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| 242 | */
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| 243 | Identifier& operator+=(const Identifier& rhs);
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| 244 |
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| 245 | /**
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| 246 | * substracts rhs->key from this->key
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| 247 | *
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| 248 | * @param rhs the Identifier with the defined key
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| 249 | * @return this Identifier object
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| 250 | */
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| 251 | Identifier& operator-=(const Identifier& rhs);
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| 252 |
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| 253 | /**
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| 254 | * adds rhs->key to this->key
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| 255 | *
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| 256 | * @param rhs the Identifier with the defined key
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| 257 | * @return this Identifier object
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| 258 | */
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| 259 | Identifier operator+(const Identifier& rhs) const;
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| 260 |
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| 261 | /**
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| 262 | * substracts rhs->key from this->key
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| 263 | *
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| 264 | * @param rhs the Identifier with the defined key
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| 265 | * @return this Identifier object
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| 266 | */
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| 267 | Identifier operator-(const Identifier& rhs) const;
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| 268 |
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| 269 | /**
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| 270 | * substracts 1 from this->key
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| 271 | *
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| 272 | * @return this Identifier object
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| 273 | */
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| 274 | Identifier operator--(int);
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| 275 |
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| 276 | /**
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| 277 | * adds 1 to this->key
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| 278 | *
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| 279 | * @return this Identifier object
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| 280 | */
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| 281 | Identifier operator++(int);
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| 282 |
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| 283 | /**
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| 284 | * bitwise shift right
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| 285 | *
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| 286 | * @param num number of bits to shift
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| 287 | * @return this Identifier object
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| 288 | */
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| 289 | Identifier operator>>(uint num) const;
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| 290 |
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| 291 | /**
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| 292 | * bitwise shift left
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| 293 | *
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| 294 | * @param num number of bits to shift
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| 295 | * @return this Identifier object
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| 296 | */
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| 297 | Identifier operator<<(uint num) const;
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| 298 |
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| 299 | /**
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| 300 | * bitwise AND of rhs->key and this->key
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| 301 | *
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| 302 | * @param rhs the Identifier AND is calculated with
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| 303 | * @return this Identifier object
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| 304 | */
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| 305 | Identifier operator&(const Identifier& rhs) const;
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| 306 |
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| 307 | /**
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| 308 | * bitwise OR of rhs->key and this->key
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| 309 | *
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| 310 | * @param rhs the Identifier OR is calculated with
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| 311 | * @return this Identifier object
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| 312 | */
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| 313 | Identifier operator|(const Identifier& rhs) const;
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| 314 |
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| 315 | /**
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| 316 | * bitwise XOR of rhs->key and this->key
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| 317 | *
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| 318 | * @param rhs the Identifier XOR is calculated with
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| 319 | * @return this Identifier object
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| 320 | */
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| 321 | Identifier operator^(const Identifier& rhs) const;
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| 322 |
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| 323 | /**
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| 324 | * bitwise NOT of this->key
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| 325 | *
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| 326 | * @return this Identifier object
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| 327 | */
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| 328 | Identifier operator~() const;
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| 329 |
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| 330 | /**
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| 331 | * returns the n-th bit of this->key
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| 332 | *
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| 333 | * @param n the position of the returned bit
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| 334 | * @return the bit on position n in this->key
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| 335 | */
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| 336 | IdentifierBit operator[](uint n);
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| 337 |
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| 338 | /**
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| 339 | * sets a bit of this->key
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| 340 | *
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| 341 | * @param pos the position of the bit to set
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| 342 | * @param value new value for bit at position pos
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| 343 | * @return *this
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| 344 | */
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| 345 | Identifier& setBitAt(uint pos, bool value);
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| 346 |
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| 347 | //-------------------------------------------------------------------------
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| 348 | // additional math
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| 349 | //-------------------------------------------------------------------------
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| 350 |
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| 351 | /**
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| 352 | * Returns a sub integer at position p with n-bits. p is counted starting
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| 353 | * from the least significant bit of the key as bit 0. Bit p of the key
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| 354 | * becomes bit 0 of the returned integer.
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| 355 | *
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| 356 | * @param p the position of the sub-integer
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| 357 | * @param n the number of bits to be returned (max.32)
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| 358 | * @return The sub-integer.
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| 359 | */
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| 360 | uint32_t get(uint p, uint n) const;
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| 361 |
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| 362 | /**
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| 363 | * Returns a hash value for the key
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| 364 | *
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| 365 | * @return size_t The hash value
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| 366 | */
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| 367 | size_t hash() const;
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| 368 |
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| 369 | /**
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| 370 | * Returns the position of the msb in this key, which represents
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| 371 | * just the logarithm to base 2.
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| 372 | *
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| 373 | * @return The logarithm to base 2 of this key.
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| 374 | */
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| 375 | int log_2() const;
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| 376 |
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| 377 | /**
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| 378 | * Fills the suffix starting at pos with random bits to lsb.
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| 379 | *
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| 380 | * @param pos
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| 381 | * @return Identifier
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| 382 | */
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| 383 | Identifier randomSuffix(uint pos) const;
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| 384 |
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| 385 | /**
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| 386 | * Fills the prefix starting at pos with random bits to msb.
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| 387 | *
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| 388 | * @param pos
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| 389 | * @return Identifier
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| 390 | */
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| 391 | Identifier randomPrefix(uint pos) const;
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| 392 |
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| 393 | /**
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| 394 | * Calculates the number of equal bits from the left with another
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| 395 | * Key (shared prefix length)
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| 396 | *
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| 397 | * @param compKey the Key to compare with
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| 398 | * @return length of shared prefix
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| 399 | */
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| 400 | uint sharedPrefixLength(const Identifier& compKey) const;
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| 401 |
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| 402 | /**
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| 403 | * Returns true, if this key is element of the interval (keyA, keyB)
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| 404 | * on the ring.
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| 405 | *
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| 406 | * @param keyA The left border of the interval
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| 407 | * @param keyB The right border of the interval
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| 408 | * @return True, if the key is element of the interval (keyA, keyB)
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| 409 | */
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| 410 | bool isBetween(const Identifier& keyA, const Identifier& keyB) const;
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| 411 |
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| 412 | /**
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| 413 | * Returns true, if this key is element of the interval (keyA, keyB]
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| 414 | * on the ring.
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| 415 | *
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| 416 | * @param keyA The left border of the interval
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| 417 | * @param keyB The right border of the interval
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| 418 | * @return True, if the key is element of the interval (keyA, keyB]
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| 419 | */
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| 420 | bool isBetweenR(const Identifier& keyA, const Identifier& keyB) const;
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| 421 |
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| 422 | /**
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| 423 | * Returns true, if this key is element of the interval [keyA, keyB)
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| 424 | * on the ring.
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| 425 | *
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| 426 | * @param keyA The left border of the interval
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| 427 | * @param keyB The right border of the interval
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| 428 | * @return True, if the key is element of the interval [keyA, keyB)
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| 429 | */
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| 430 | bool isBetweenL(const Identifier& keyA, const Identifier& keyB) const;
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| 431 |
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| 432 | /**
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| 433 | * Returns true, if this key is element of the interval [keyA, keyB]
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| 434 | * on the ring.
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| 435 | *
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| 436 | * @param keyA The left border of the interval
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| 437 | * @param keyB The right border of the interval
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| 438 | * @return True, if the key is element of the interval [keyA, keyB]
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| 439 | */
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| 440 | bool isBetweenLR(const Identifier& keyA, const Identifier& keyB) const;
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| 441 |
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| 442 | //-------------------------------------------------------------------------
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| 443 | // static methods
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| 444 | //-------------------------------------------------------------------------
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| 445 |
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| 446 | /**
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| 447 | * Set the length of an Identifier
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| 448 | *
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| 449 | * @param length keylength in bits
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| 450 | */
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| 451 | static void setKeyLength(uint length);
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| 452 |
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| 453 | /**
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| 454 | * Returns the length in number of bits.
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| 455 | *
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| 456 | * @return The length in number of bits.
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| 457 | */
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| 458 | static uint getLength();
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| 459 |
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| 460 | /**
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| 461 | * Returns a random key.
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| 462 | *
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| 463 | * @return A random key.
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| 464 | */
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| 465 | static Identifier random();
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| 466 |
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| 467 | /**
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| 468 | * Returns the maximum key, i.e. a key filled with bit 1
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| 469 | *
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| 470 | * @return The maximum key, i.e. a key filled with bit 1
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| 471 | */
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| 472 | static Identifier max();
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| 473 |
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| 474 |
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| 475 | // README: due to some problems with serialization the keylength
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| 476 | // was changed to 192 bit! As none of the hashing functions
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| 477 | // can provide 192 bit output, and we currently don't use any
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| 478 | // hashing for identifiers in the demo at all ... this is all commented out!!
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| 479 | /**
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| 480 | * Returns a key with the SHA1 cryptographic hash of a
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| 481 | * string
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| 482 | *
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| 483 | * @param value A string value.
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| 484 | * @return SHA1 of value
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| 485 | */
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| 486 | static Identifier sha1(const string& value);
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| 487 |
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| 488 | static Identifier sha1(const uint8_t* value, size_t length );
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| 489 |
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| 490 | /**
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| 491 | * Returns a key 2^exponent.
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| 492 | *
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| 493 | * @param exponent The exponent.
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| 494 | * @return Key=2^exponent.
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| 495 | */
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| 496 | static Identifier pow2(uint exponent);
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| 497 |
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| 498 | private:
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| 499 | // private constants
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| 500 |
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| 501 | static uint keyLength; /**< actual length of the key */
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| 502 | static uint aSize; /**< number of needed machine words to hold the key*/
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| 503 | static mp_limb_t GMP_MSB_MASK; /**< bits to fill up if key does not
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| 504 | exactly fit in one or more machine words */
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| 505 |
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| 506 | // private fields
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| 507 | bool isUnspec; /**< is this->key unspecified? */
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| 508 |
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| 509 | void seed();
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| 510 |
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| 511 | static const size_t array_size = MAX_KEYLENGTH / (8 * sizeof(mp_limb_t))
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| 512 | + (MAX_KEYLENGTH % (8 * sizeof(mp_limb_t)) != 0 ? 1 : 0);
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| 513 |
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| 514 | /** the overlay key this object represents */
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| 515 | mp_limb_t key[array_size + 1];
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| 516 |
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| 517 | // private "helper" methods
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| 518 | /**
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| 519 | * trims key after key operations
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| 520 | */
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| 521 | void trim();
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| 522 |
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| 523 | /**
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| 524 | * set this->key to 0 and isUnspec to false
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| 525 | */
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| 526 | void clear();
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| 527 | };
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| 528 |
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| 529 | /**
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| 530 | * An auxiliary class for single bits in OverlayKey
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| 531 | *
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| 532 | * Allows statements like "key[n] = true"
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| 533 | */
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| 534 | class IdentifierBit {
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| 535 | public:
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| 536 |
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| 537 | IdentifierBit(bool value, uint pos, Identifier* key) :
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| 538 | bit(value), pos(pos), key(key) {
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| 539 | }
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| 540 |
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| 541 | /** Converts to a boolean value */
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| 542 | inline operator bool() {
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| 543 | return bit;
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| 544 | }
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| 545 |
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| 546 | /** Sets the corresponding bit to a boolean value
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| 547 | * @param value value to set to
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| 548 | */
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| 549 | inline IdentifierBit& operator=(bool value) {
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| 550 | key->setBitAt(pos, value);
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| 551 | return *this;
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| 552 | }
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| 553 |
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| 554 | inline IdentifierBit& operator^=(bool value) {
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| 555 | key->setBitAt(pos, (*key)[pos] ^ value);
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| 556 | return *this;
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| 557 | }
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| 558 |
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| 559 | private:
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| 560 |
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| 561 | bool bit;
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| 562 | uint pos;
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| 563 | Identifier* key;
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| 564 | };
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| 565 |
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| 566 | }
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| 567 | } // namespace ariba, common
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| 568 |
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| 569 | /* serializers */
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| 570 | sznBeginDefault( ariba::utility::Identifier, X ) {
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| 571 |
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| 572 | // calculate length of key
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| 573 | uint16_t len = array_size*sizeof(mp_limb_t);
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| 574 | uint8_t unspec = isUnspec;
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| 575 |
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| 576 | // only serialize the lower 16 bits of keyLength
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| 577 | X && unspec && len;
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| 578 |
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| 579 | // serialize the identifier
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| 580 | for (int i=array_size-1; i>=0; i--) X && key[i];
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| 581 |
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| 582 | // when deserializing set unspec flag
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| 583 | if (X.isDeserializer()){
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| 584 | isUnspec = unspec;
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| 585 | }
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| 586 |
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| 587 | } sznEnd();
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| 588 |
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| 589 | #endif /* IDENTIFIER_H_ */
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