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#include "config.h"
32#include "UUID.h"
33
34#include "NotImplemented.h"
35
36#if PLATFORM(QT)
37#include <QUuid>
38#endif
39
40#if OS(WINDOWS)
41#include <objbase.h>
42#elif OS(DARWIN) && USE(CF)
43#include <CoreFoundation/CoreFoundation.h>
44#elif OS(LINUX) && !PLATFORM(CHROMIUM)
45#include <stdio.h>
46#elif (OS(LINUX) && PLATFORM(CHROMIUM)) || (OS(DARWIN) && !USE(CF))
47#include <wtf/HexNumber.h>
48#include <wtf/RandomNumber.h>
49#include <wtf/text/StringBuilder.h>
50#endif
51
52namespace WebCore {
53
54static const char uuidVersionRequired = '4';
55static const int uuidVersionIdentifierIndex = 14;
56
57String createCanonicalUUIDString()
58{
59#if PLATFORM(QT) && !defined(QT_NO_QUUID_STRING)
60    QUuid uuid = QUuid::createUuid();
61    String canonicalUuidStr = uuid.toString().mid(1, 36).toLower(); // remove opening and closing bracket and make it lower.
62    ASSERT(canonicalUuidStr[uuidVersionIdentifierIndex] == uuidVersionRequired);
63    return canonicalUuidStr;
64#elif OS(WINDOWS)
65    GUID uuid = { 0 };
66    HRESULT hr = CoCreateGuid(&uuid);
67    if (FAILED(hr))
68        return String();
69    wchar_t uuidStr[40];
70    int num = StringFromGUID2(uuid, reinterpret_cast<LPOLESTR>(uuidStr), WTF_ARRAY_LENGTH(uuidStr));
71    ASSERT(num == 39);
72    String canonicalUuidStr = String(uuidStr + 1, num - 3).lower(); // remove opening and closing bracket and make it lower.
73    ASSERT(canonicalUuidStr[uuidVersionIdentifierIndex] == uuidVersionRequired);
74    return canonicalUuidStr;
75#elif OS(DARWIN) && USE(CF)
76    CFUUIDRef uuid = CFUUIDCreate(0);
77    CFStringRef uuidStrRef = CFUUIDCreateString(0, uuid);
78    String uuidStr(uuidStrRef);
79    CFRelease(uuidStrRef);
80    CFRelease(uuid);
81    String canonicalUuidStr = uuidStr.lower(); // make it lower.
82    ASSERT(canonicalUuidStr[uuidVersionIdentifierIndex] == uuidVersionRequired);
83    return canonicalUuidStr;
84#elif OS(LINUX) && !PLATFORM(CHROMIUM)
85    // This does not work for the linux system that turns on sandbox.
86    FILE* fptr = fopen("/proc/sys/kernel/random/uuid", "r");
87    if (!fptr)
88        return String();
89    char uuidStr[37];
90    char* result = fgets(uuidStr, sizeof(uuidStr), fptr);
91    fclose(fptr);
92    if (!result)
93        return String();
94    String canonicalUuidStr = String(uuidStr).lower(); // make it lower.
95    ASSERT(canonicalUuidStr[uuidVersionIdentifierIndex] == uuidVersionRequired);
96    return canonicalUuidStr;
97#elif (OS(LINUX) && PLATFORM(CHROMIUM)) || (OS(DARWIN) && !USE(CF))
98    unsigned randomData[4];
99    for (size_t i = 0; i < WTF_ARRAY_LENGTH(randomData); ++i)
100        randomData[i] = static_cast<unsigned>(randomNumber() * (std::numeric_limits<unsigned>::max() + 1.0));
101
102    // Format as Version 4 UUID.
103    StringBuilder builder;
104    appendUnsignedAsHexFixedSize(randomData[0], builder, 8, Lowercase);
105    builder.append("-");
106    appendUnsignedAsHexFixedSize(randomData[1] >> 16, builder, 4, Lowercase);
107    builder.append("-4");
108    appendUnsignedAsHexFixedSize(randomData[1] & 0x00000fff, builder, 3, Lowercase);
109    builder.append("-");
110    appendUnsignedAsHexFixedSize((randomData[2] >> 30) | 0x8, builder, 1, Lowercase);
111    appendUnsignedAsHexFixedSize((randomData[2] >> 16) & 0x00000fff, builder, 3, Lowercase);
112    builder.append("-");
113    appendUnsignedAsHexFixedSize(randomData[2] & 0x0000ffff, builder, 4, Lowercase);
114    appendUnsignedAsHexFixedSize(randomData[3], builder, 8, Lowercase);
115    builder.append("\n");
116    return builder.toString();
117#else
118    notImplemented();
119    return String();
120#endif
121}
122
123}
124