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A lightweight C++ OpenGL middleware for 2D/3D graphics

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# D:/VL/BuildSystem/VL_DISTRO/Visualization_Library_SDK/src/vlCore/UUID.cpp

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    00001 /**************************************************************************************/
    00002 /*                                                                                    */
    00003 /*  Visualization Library                                                             */
    00004 /*  http://www.visualizationlibrary.com                                               */
    00005 /*                                                                                    */
    00006 /*  Copyright (c) 2005-2010, Michele Bosi                                             */
    00007 /*  All rights reserved.                                                              */
    00008 /*                                                                                    */
    00009 /*  Redistribution and use in source and binary forms, with or without modification,  */
    00010 /*  are permitted provided that the following conditions are met:                     */
    00011 /*                                                                                    */
    00012 /*  - Redistributions of source code must retain the above copyright notice, this     */
    00013 /*  list of conditions and the following disclaimer.                                  */
    00014 /*                                                                                    */
    00015 /*  - Redistributions in binary form must reproduce the above copyright notice, this  */
    00016 /*  list of conditions and the following disclaimer in the documentation and/or       */
    00017 /*  other materials provided with the distribution.                                   */
    00018 /*                                                                                    */
    00019 /*  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND   */
    00020 /*  ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED     */
    00021 /*  WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE            */
    00022 /*  DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR  */
    00023 /*  ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES    */
    00024 /*  (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;      */
    00025 /*  LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON    */
    00026 /*  ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT           */
    00027 /*  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS     */
    00028 /*  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.                      */
    00029 /*                                                                                    */
    00030 /**************************************************************************************/
    00031
    00032 #include <vlCore/UUID.hpp>
    00033 #include <vlCore/Time.hpp>
    00034 #include <vlCore/Random.hpp>
    00035 #include <vector>
    00036
    00037 using namespace vl;
    00038
    00039 //-----------------------------------------------------------------------------
    00040 UUID::UUID()
    00041 {
    00042   memset(this, 0, sizeof(*this));
    00043 }
    00044 //-----------------------------------------------------------------------------
    00045 void UUID::generateVersion4(const Random& random)
    00046 {
    00047   random.fillRandom(this,sizeof(*this));
    00048
    00049   // Set the two most significant bits (bits 6 and 7) of the ClockSeqHiAndReserved to zero and one, respectively.
    00050   mClockSeqHiAndReserved &= 0x3F;
    00051   mClockSeqHiAndReserved |= 0x80;
    00052
    00053   // Set the four most significant bits (bits 12 through 15) of the TimeHiAndVersion field to the 4-bit version number from Section 4.1.3.
    00054   mTimeHiAndVersion &= 0x0FFF;
    00055   mTimeHiAndVersion |= 0x4000;
    00056 }
    00057 //-----------------------------------------------------------------------------
    00058 void UUID::toStdString(std::string& guid_str) const
    00059 {
    00060   char str[38];
    00061   fillString(str, false);
    00062   // avoid reallocation
    00063   guid_str.resize(38);
    00064   for(int i=0; i<38; ++i)
    00065     guid_str[i] = str[i];
    00066 }
    00067 //-----------------------------------------------------------------------------
    00068 void UUID::fillString(char* guid_str, bool zero_terminate) const
    00069 {
    00070   const char* hex= "0123456789abcdef";
    00071
    00072   // 01234567890123456789012345678901234567
    00073   // {xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx}
    00074
    00075   if (zero_terminate)
    00076     guid_str[38] = 0;
    00077
    00078   guid_str[0]  = '{';
    00079   guid_str[9]  = '-';
    00080   guid_str[14] = '-';
    00081   guid_str[19] = '-';
    00082   guid_str[24] = '-';
    00083   guid_str[37] = '}';
    00084
    00085   // TimeLow:
    00086   for(int i=0; i<8; ++i)
    00087     guid_str[i+1] = hex[ (mTimeLow >> (28-4*i)) & 0xF];
    00088
    00089   // TimeMid:
    00090   for(int i=0; i<4; ++i)
    00091     guid_str[i+10] = hex[ (mTimeMid >> (12-4*i)) & 0xF];
    00092
    00093   // TimeHiAndVersion:
    00094   for(int i=0; i<4; ++i)
    00095     guid_str[i+15] = hex[ (mTimeHiAndVersion >> (12-4*i)) & 0xF];
    00096
    00097   // ClockSeqHiAndReserved:
    00098   guid_str[20] = hex[ (mClockSeqHiAndReserved >> (4-4*0)) & 0xF];
    00099   guid_str[21] = hex[ (mClockSeqHiAndReserved >> (4-4*1)) & 0xF];
    00100
    00101   // ClockSeqLow:
    00102   guid_str[22] = hex[ (mClockSeqLow >> (4-4*0)) & 0xF];
    00103   guid_str[23] = hex[ (mClockSeqLow >> (4-4*1)) & 0xF];
    00104
    00105   // Node:
    00106   guid_str[25] = hex[ (mNode[0] >> (4-4*0)) & 0xF];
    00107   guid_str[26] = hex[ (mNode[0] >> (4-4*1)) & 0xF];
    00108   guid_str[27] = hex[ (mNode[1] >> (4-4*0)) & 0xF];
    00109   guid_str[28] = hex[ (mNode[1] >> (4-4*1)) & 0xF];
    00110   guid_str[29] = hex[ (mNode[2] >> (4-4*0)) & 0xF];
    00111   guid_str[30] = hex[ (mNode[2] >> (4-4*1)) & 0xF];
    00112   guid_str[31] = hex[ (mNode[3] >> (4-4*0)) & 0xF];
    00113   guid_str[32] = hex[ (mNode[3] >> (4-4*1)) & 0xF];
    00114   guid_str[33] = hex[ (mNode[4] >> (4-4*0)) & 0xF];
    00115   guid_str[34] = hex[ (mNode[4] >> (4-4*1)) & 0xF];
    00116   guid_str[35] = hex[ (mNode[5] >> (4-4*0)) & 0xF];
    00117   guid_str[36] = hex[ (mNode[5] >> (4-4*1)) & 0xF];
    00118
    00119   // equivalent to the following formatting:
    00120 #if 0
    00121   char guid_cstr[100];
    00122   sprintf(guid_cstr, "{%8.8x-%4.4x-%4.4x-%2.2x%2.2x-%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x}",
    00123     mTimeLow, mTimeMid, mTimeHiAndVersion,
    00124     mClockSeqHiAndReserved, mClockSeqLow,
    00125     mNode[0], mNode[1], mNode[2], mNode[3], mNode[4], mNode[5]);
    00126   VL_CHECK( memcmp(guid_str, guid_cstr, 38) == 0 )
    00127 #endif
    00128 }
    00129 //-----------------------------------------------------------------------------
    00130 std::string UUID::toStdString() const
    00131 {
    00132   std::string guid_str;
    00133   toStdString(guid_str);
    00134   return guid_str;
    00135 }
    00136 //-----------------------------------------------------------------------------
    00137 bool UUID::fromString(const char* guid_str)
    00138 {
    00139   char xxx[38];
    00140   memcpy(xxx, guid_str, 38);
    00141
    00142   if (guid_str[0] != '{')
    00143     return false;
    00144
    00145   if (guid_str[37] != '}')
    00146     return false;
    00147
    00148   if (guid_str[9] != '-')
    00149     return false;
    00150
    00151   if (guid_str[14] != '-')
    00152     return false;
    00153
    00154   if (guid_str[19] != '-')
    00155     return false;
    00156
    00157   if (guid_str[24] != '-')
    00158     return false;
    00159
    00160   // to lower case, check hex numbers, convert to nybbles
    00161   unsigned int nibble[38];
    00162   for(int i=0; i<38; ++i)
    00163   {
    00164     if (i==0 || i==37 || i==9 || i==14 || i==19 || i==24 )
    00165       continue;
    00166
    00167     if ( guid_str[i]>='0' && guid_str[i]<='9' )
    00168       nibble[i] = guid_str[i] - '0';
    00169     else
    00170     if ( guid_str[i]>='a' && guid_str[i]<='f' )
    00171       nibble[i] = guid_str[i] - 'a' + 10;
    00172     else
    00173     if ( guid_str[i]>='A' && guid_str[i]<='F' )
    00174       nibble[i] = guid_str[i] - 'A' + 10;
    00175     else
    00176       return false;
    00177   }
    00178
    00179   // 01234567890123456789012345678901234567
    00180   // {xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx}
    00181
    00182   memset(this, 0, sizeof(*this));
    00183
    00184   mTimeLow = (nibble[1] << 28) | (nibble[2] << 24) | (nibble[3] << 20) | (nibble[4] << 16) |
    00185              (nibble[5] << 12) | (nibble[6] <<  8) | (nibble[7] <<  4) | nibble[8];
    00186
    00187   mTimeMid = (unsigned short)((nibble[10] << 12) | (nibble[11] <<  8) | (nibble[12] <<  4) | nibble[13]);
    00188
    00189   mTimeHiAndVersion = (unsigned short)((nibble[15] << 12) | (nibble[16] <<  8) | (nibble[17] <<  4) | nibble[18]);
    00190
    00191   mClockSeqHiAndReserved  = (unsigned char)((nibble[20] << 4) | nibble[21]);
    00192
    00193   mClockSeqLow = (unsigned char)((nibble[22] << 4) | (nibble[23] << 0));
    00194
    00195   mNode[0] = (unsigned char)((nibble[25] << 4) | nibble[26]);
    00196   mNode[1] = (unsigned char)((nibble[27] << 4) | nibble[28]);
    00197   mNode[2] = (unsigned char)((nibble[29] << 4) | nibble[30]);
    00198   mNode[3] = (unsigned char)((nibble[31] << 4) | nibble[32]);
    00199   mNode[4] = (unsigned char)((nibble[33] << 4) | nibble[34]);
    00200   mNode[5] = (unsigned char)((nibble[35] << 4) | nibble[36]);
    00201
    00202   return true;
    00203 }
    00204 //-----------------------------------------------------------------------------
    00205

Visualization Library v2011.05.1142 Reference Documentation
Copyright 2005-2011 Michele Bosi. All rights reserved.
Updated on Thu May 26 2011 22:51:22.
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