/** * @file lluuid.h * * $LicenseInfo:firstyear=2000&license=viewerlgpl$ * Second Life Viewer Source Code * Copyright (C) 2010, Linden Research, Inc. * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; * version 2.1 of the License only. * * This library is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this library; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA * * Linden Research, Inc., 945 Battery Street, San Francisco, CA 94111 USA * $/LicenseInfo$ */ #ifndef LL_LLUUID_H #define LL_LLUUID_H #include #include #include "stdtypes.h" #include "llpreprocessor.h" const S32 UUID_BYTES = 16; const S32 UUID_WORDS = 4; const S32 UUID_STR_LENGTH = 37; // actually wrong, should be 36 and use size below const S32 UUID_STR_SIZE = 37; const S32 UUID_BASE85_LENGTH = 21; // including the trailing NULL. struct uuid_time_t { U32 high; U32 low; }; class LL_COMMON_API LLUUID { public: // // CREATORS // LLUUID(); explicit LLUUID(const char *in_string); // Convert from string. explicit LLUUID(const std::string& in_string); // Convert from string. LLUUID(const LLUUID &in); LLUUID &operator=(const LLUUID &rhs); ~LLUUID(); // // MANIPULATORS // void generate(); // Generate a new UUID void generate(const std::string& stream); //Generate a new UUID based on hash of input stream static LLUUID generateNewID(std::string stream = ""); //static version of above for use in initializer expressions such as constructor params, etc. BOOL set(const char *in_string, BOOL emit = TRUE); // Convert from string, if emit is FALSE, do not emit warnings BOOL set(const std::string& in_string, BOOL emit = TRUE); // Convert from string, if emit is FALSE, do not emit warnings void setNull(); // Faster than setting to LLUUID::null. S32 cmpTime(uuid_time_t *t1, uuid_time_t *t2); static void getSystemTime(uuid_time_t *timestamp); void getCurrentTime(uuid_time_t *timestamp); // // ACCESSORS // BOOL isNull() const; // Faster than comparing to LLUUID::null. BOOL notNull() const; // Faster than comparing to LLUUID::null. // JC: This is dangerous. It allows UUIDs to be cast automatically // to integers, among other things. Use isNull() or notNull(). // operator bool() const; // JC: These must return real bool's (not BOOLs) or else use of the STL // will generate bool-to-int performance warnings. bool operator==(const LLUUID &rhs) const; bool operator!=(const LLUUID &rhs) const; bool operator<(const LLUUID &rhs) const; bool operator>(const LLUUID &rhs) const; // xor functions. Useful since any two random uuids xored together // will yield a determinate third random unique id that can be // used as a key in a single uuid that represents 2. const LLUUID& operator^=(const LLUUID& rhs); LLUUID operator^(const LLUUID& rhs) const; // similar to functions above, but not invertible // yields a third random UUID that can be reproduced from the two inputs // but which, given the result and one of the inputs can't be used to // deduce the other input LLUUID combine(const LLUUID& other) const; void combine(const LLUUID& other, LLUUID& result) const; friend LL_COMMON_API std::ostream& operator<<(std::ostream& s, const LLUUID &uuid); friend LL_COMMON_API std::istream& operator>>(std::istream& s, LLUUID &uuid); void toString(char *out) const; // Does not allocate memory, needs 36 characters (including \0) void toString(std::string& out) const; void toCompressedString(char *out) const; // Does not allocate memory, needs 17 characters (including \0) void toCompressedString(std::string& out) const; std::string asString() const; std::string getString() const; U16 getCRC16() const; U32 getCRC32() const; static BOOL validate(const std::string& in_string); // Validate that the UUID string is legal. static const LLUUID null; static U32 getRandomSeed(); static S32 getNodeID(unsigned char * node_id); static BOOL parseUUID(const std::string& buf, LLUUID* value); U8 mData[UUID_BYTES]; }; typedef std::vector uuid_vec_t; // Construct inline LLUUID::LLUUID() { setNull(); } // Faster than copying from memory inline void LLUUID::setNull() { U32 *word = (U32 *)mData; word[0] = 0; word[1] = 0; word[2] = 0; word[3] = 0; } // Compare inline bool LLUUID::operator==(const LLUUID& rhs) const { U32 *tmp = (U32 *)mData; U32 *rhstmp = (U32 *)rhs.mData; // Note: binary & to avoid branching return (tmp[0] == rhstmp[0]) & (tmp[1] == rhstmp[1]) & (tmp[2] == rhstmp[2]) & (tmp[3] == rhstmp[3]); } inline bool LLUUID::operator!=(const LLUUID& rhs) const { U32 *tmp = (U32 *)mData; U32 *rhstmp = (U32 *)rhs.mData; // Note: binary | to avoid branching return (tmp[0] != rhstmp[0]) | (tmp[1] != rhstmp[1]) | (tmp[2] != rhstmp[2]) | (tmp[3] != rhstmp[3]); } /* // JC: This is dangerous. It allows UUIDs to be cast automatically // to integers, among other things. Use isNull() or notNull(). inline LLUUID::operator bool() const { U32 *word = (U32 *)mData; return (word[0] | word[1] | word[2] | word[3]) > 0; } */ inline BOOL LLUUID::notNull() const { U32 *word = (U32 *)mData; return (word[0] | word[1] | word[2] | word[3]) > 0; } // Faster than == LLUUID::null because doesn't require // as much memory access. inline BOOL LLUUID::isNull() const { U32 *word = (U32 *)mData; // If all bits are zero, return !0 == TRUE return !(word[0] | word[1] | word[2] | word[3]); } // Copy constructor inline LLUUID::LLUUID(const LLUUID& rhs) { U32 *tmp = (U32 *)mData; U32 *rhstmp = (U32 *)rhs.mData; tmp[0] = rhstmp[0]; tmp[1] = rhstmp[1]; tmp[2] = rhstmp[2]; tmp[3] = rhstmp[3]; } inline LLUUID::~LLUUID() { } // Assignment inline LLUUID& LLUUID::operator=(const LLUUID& rhs) { // No need to check the case where this==&rhs. The branch is slower than the write. U32 *tmp = (U32 *)mData; U32 *rhstmp = (U32 *)rhs.mData; tmp[0] = rhstmp[0]; tmp[1] = rhstmp[1]; tmp[2] = rhstmp[2]; tmp[3] = rhstmp[3]; return *this; } inline LLUUID::LLUUID(const char *in_string) { if (!in_string || in_string[0] == 0) { setNull(); return; } set(in_string); } inline LLUUID::LLUUID(const std::string& in_string) { if (in_string.empty()) { setNull(); return; } set(in_string); } // IW: DON'T "optimize" these w/ U32s or you'll scoogie the sort order // IW: this will make me very sad inline bool LLUUID::operator<(const LLUUID &rhs) const { U32 i; for( i = 0; i < (UUID_BYTES - 1); i++ ) { if( mData[i] != rhs.mData[i] ) { return (mData[i] < rhs.mData[i]); } } return (mData[UUID_BYTES - 1] < rhs.mData[UUID_BYTES - 1]); } inline bool LLUUID::operator>(const LLUUID &rhs) const { U32 i; for( i = 0; i < (UUID_BYTES - 1); i++ ) { if( mData[i] != rhs.mData[i] ) { return (mData[i] > rhs.mData[i]); } } return (mData[UUID_BYTES - 1] > rhs.mData[UUID_BYTES - 1]); } inline U16 LLUUID::getCRC16() const { // A UUID is 16 bytes, or 8 shorts. U16 *short_data = (U16*)mData; U16 out = 0; out += short_data[0]; out += short_data[1]; out += short_data[2]; out += short_data[3]; out += short_data[4]; out += short_data[5]; out += short_data[6]; out += short_data[7]; return out; } inline U32 LLUUID::getCRC32() const { U32 *tmp = (U32*)mData; return tmp[0] + tmp[1] + tmp[2] + tmp[3]; } // Helper structure for ordering lluuids in stl containers. // eg: std::map widget_map; struct lluuid_less { bool operator()(const LLUUID& lhs, const LLUUID& rhs) const { return (lhs < rhs) ? true : false; } }; typedef std::set uuid_list_t; /* * Sub-classes for keeping transaction IDs and asset IDs * straight. */ typedef LLUUID LLAssetID; class LL_COMMON_API LLTransactionID : public LLUUID { public: LLTransactionID() : LLUUID() { } static const LLTransactionID tnull; LLAssetID makeAssetID(const LLUUID& session) const; }; #endif