1 /* 2 * Copyright (C) 2010 Google Inc. All rights reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions are 6 * met: 7 * 8 * * Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * * Redistributions in binary form must reproduce the above 11 * copyright notice, this list of conditions and the following disclaimer 12 * in the documentation and/or other materials provided with the 13 * distribution. 14 * * Neither the name of Google Inc. nor the names of its 15 * contributors may be used to endorse or promote products derived from 16 * this software without specific prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 19 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 20 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 21 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 22 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 23 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 24 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 28 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 29 */ 30 31 #ifndef UUID_h 32 #define UUID_h 33 34 #include "PlatformString.h" 35 36 namespace WebCore { 37 38 // Creates a UUID that consists of 32 hexadecimal digits and returns its canonical form. 39 // The canonical form is displayed in 5 groups separated by hyphens, in the form 8-4-4-4-12 for a total of 36 characters. 40 // The hexadecimal values "a" through "f" are output as lower case characters. 41 // 42 // Note: for security reason, we should always generate version 4 UUID that use a scheme relying only on random numbers. 43 // This algorithm sets the version number as well as two reserved bits. All other bits are set using a random or pseudorandom 44 // data source. Version 4 UUIDs have the form xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx with hexadecimal digits for x and one of 8, 45 // 9, A, or B for y. 46 // 47 // On Windows, version 4 UUIDs are used since Windows 2000 (http://msdn.microsoft.com/en-us/library/aa446557.aspx). 48 // On MacOSX, version 4 UUIDs are used since Tiger (http://developer.apple.com/mac/library/technotes/tn/tn1103.html#TNTAG8). 49 // On Linux, the kernel offers the procfs pseudo-file /proc/sys/kernel/random/uuid that yields version 4 UUIDs (http://hbfs.wordpress.com/2008/09/30/ueid-unique-enough-ids/). 50 String createCanonicalUUIDString(); 51 52 } 53 54 #endif 55
