/*

* Copyright (C) 2010 Google Inc. All rights reserved.

*

* Redistribution and use in source and binary forms, with or without

* modification, are permitted provided that the following conditions are

* met:

*

*     * Redistributions of source code must retain the above copyright

* notice, this list of conditions and the following disclaimer.

 *     * Redistributions in binary form must reproduce the above

 * copyright notice, this list of conditions and the following disclaimer

 * in the documentation and/or other materials provided with the

 * distribution.

 *     * Neither the name of Google Inc. nor the names of its

 * contributors may be used to endorse or promote products derived from

 * this software without specific prior written permission.

 *

 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS

 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT

 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR

 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT

 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,

 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT

 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,

 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY

 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE

 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

 */

#include "config.h"

#include "UUID.h"

#include "NotImplemented.h"

#if PLATFORM(QT)

#include <QUuid>

#endif

#if OS(WINDOWS)

#include <objbase.h>

#ifndef ARRAYSIZE

#define ARRAYSIZE(a)           (sizeof(a) / sizeof((a)[0]))

#endif

#elif OS(DARWIN)

#include <CoreFoundation/CoreFoundation.h>

#elif OS(LINUX)

#include <stdio.h>

#endif

namespace WebCore {

static const char uuidVersionRequired = '4';

static const int uuidVersionIdentifierIndex = 14;

String createCanonicalUUIDString()

{

#if PLATFORM(QT)

    QUuid uuid = QUuid::createUuid();

    String canonicalUuidStr = uuid.toString().mid(1, 36).toLower(); // remove opening and closing bracket and make it lower.

    ASSERT(canonicalUuidStr[uuidVersionIdentifierIndex] == uuidVersionRequired);

    return canonicalUuidStr;

#elif OS(WINDOWS)

    GUID uuid = { 0 };

    HRESULT hr = CoCreateGuid(&uuid);

    if (FAILED(hr))

        return String();

    wchar_t uuidStr[40];

    int num = StringFromGUID2(uuid, reinterpret_cast<LPOLESTR>(uuidStr), ARRAYSIZE(uuidStr));

    ASSERT(num == 39);

    String canonicalUuidStr = String(uuidStr + 1, num - 3).lower(); // remove opening and closing bracket and make it lower.

    ASSERT(canonicalUuidStr[uuidVersionIdentifierIndex] == uuidVersionRequired);

    return canonicalUuidStr;

#elif OS(DARWIN)

    CFUUIDRef uuid = CFUUIDCreate(0);

    CFStringRef uuidStrRef = CFUUIDCreateString(0, uuid);

    String uuidStr(uuidStrRef);

    CFRelease(uuidStrRef);

    CFRelease(uuid);

    String canonicalUuidStr = uuidStr.lower(); // make it lower.

    ASSERT(canonicalUuidStr[uuidVersionIdentifierIndex] == uuidVersionRequired);

    return canonicalUuidStr;

#elif OS(LINUX)

    FILE* fptr = fopen("/proc/sys/kernel/random/uuid", "r");

    if (!fptr)

        return String();

    char uuidStr[37] = {0};

    if (!fgets(uuidStr, sizeof(uuidStr) - 1, fptr))

        return String();

    fclose(fptr);

    String canonicalUuidStr = String(uuidStr).lower(); // make it lower.

    ASSERT(canonicalUuidStr[uuidVersionIdentifierIndex] == uuidVersionRequired);

    return canonicalUuidStr;

#else

    notImplemented();

    return String();

#endif    

}

}