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