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