зеркало из https://github.com/mozilla/pjs.git
218 строки
6.1 KiB
C++
218 строки
6.1 KiB
C++
/* -*- Mode: C++; tab-width: 50; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is mozilla.org code.
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*
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* The Initial Developer of the Original Code is
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* mozilla.org
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* Portions created by the Initial Developer are Copyright (C) 2005
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Vladimir Vukicevic <vladimir@pobox.com> (original author)
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either of the GNU General Public License Version 2 or later (the "GPL"),
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* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#if defined(XP_WIN)
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#include <windows.h>
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#include <objbase.h>
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#elif defined(XP_MACOSX)
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#include <CoreFoundation/CoreFoundation.h>
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#else
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#include <stdlib.h>
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#include "prrng.h"
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#endif
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#include "nsMemory.h"
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#include "nsAutoLock.h"
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#include "nsUUIDGenerator.h"
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NS_IMPL_THREADSAFE_ISUPPORTS1(nsUUIDGenerator, nsIUUIDGenerator)
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nsUUIDGenerator::nsUUIDGenerator()
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: mLock(nsnull)
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{
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}
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nsUUIDGenerator::~nsUUIDGenerator()
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{
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if (mLock) {
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PR_DestroyLock(mLock);
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}
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}
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nsresult
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nsUUIDGenerator::Init()
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{
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mLock = PR_NewLock();
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NS_ENSURE_TRUE(mLock, NS_ERROR_OUT_OF_MEMORY);
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// We're a service, so we're guaranteed that Init() is not going
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// to be reentered while we're inside Init().
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#if !defined(XP_WIN) && !defined(XP_MACOSX) && !defined(ANDROID)
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/* initialize random number generator using NSPR random noise */
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unsigned int seed;
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PRSize bytes = 0;
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while (bytes < sizeof(seed)) {
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PRSize nbytes = PR_GetRandomNoise(((unsigned char *)&seed)+bytes,
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sizeof(seed)-bytes);
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if (nbytes == 0) {
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return NS_ERROR_FAILURE;
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}
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bytes += nbytes;
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}
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/* Initialize a new RNG state, and immediately switch
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* back to the previous one -- we want to use mState
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* only for our own calls to random().
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*/
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mSavedState = initstate(seed, mState, sizeof(mState));
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setstate(mSavedState);
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mRBytes = 4;
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#ifdef RAND_MAX
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if ((unsigned long) RAND_MAX < (unsigned long)0xffffffff)
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mRBytes = 3;
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if ((unsigned long) RAND_MAX < (unsigned long)0x00ffffff)
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mRBytes = 2;
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if ((unsigned long) RAND_MAX < (unsigned long)0x0000ffff)
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mRBytes = 1;
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if ((unsigned long) RAND_MAX < (unsigned long)0x000000ff)
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return NS_ERROR_FAILURE;
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#endif
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#endif /* non XP_WIN and non XP_MACOSX */
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return NS_OK;
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}
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NS_IMETHODIMP
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nsUUIDGenerator::GenerateUUID(nsID** ret)
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{
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nsID *id = static_cast<nsID*>(NS_Alloc(sizeof(nsID)));
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if (id == nsnull)
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return NS_ERROR_OUT_OF_MEMORY;
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nsresult rv = GenerateUUIDInPlace(id);
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if (NS_FAILED(rv)) {
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NS_Free(id);
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return rv;
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}
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*ret = id;
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return rv;
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}
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NS_IMETHODIMP
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nsUUIDGenerator::GenerateUUIDInPlace(nsID* id)
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{
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// The various code in this method is probably not threadsafe, so lock
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// across the whole method.
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nsAutoLock lock(mLock);
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#if defined(WINCE)
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// WINCE only has CoCreateGuid if DCOM support is compiled into the BSP;
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// there's usually very little reason for DCOM to be present!
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if (!CeGenRandom(sizeof(nsID), (BYTE*) id))
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return NS_ERROR_FAILURE;
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/* Put in the version */
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id->m2 &= 0x0fff;
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id->m2 |= 0x4000;
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/* Put in the variant */
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id->m3[0] &= 0x3f;
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id->m3[0] |= 0x80;
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#elif defined(XP_WIN)
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HRESULT hr = CoCreateGuid((GUID*)id);
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if (NS_FAILED(hr))
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return NS_ERROR_FAILURE;
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#elif defined(XP_MACOSX)
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CFUUIDRef uuid = CFUUIDCreate(kCFAllocatorDefault);
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if (!uuid)
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return NS_ERROR_FAILURE;
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CFUUIDBytes bytes = CFUUIDGetUUIDBytes(uuid);
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memcpy(id, &bytes, sizeof(nsID));
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CFRelease(uuid);
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#else /* not windows or OS X; generate randomness using random(). */
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/* XXX we should be saving the return of setstate here and switching
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* back to it; instead, we use the value returned when we called
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* initstate, since older glibc's have broken setstate() return values
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*/
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#ifndef ANDROID
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setstate(mState);
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#endif
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PRSize bytesLeft = sizeof(nsID);
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while (bytesLeft > 0) {
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#ifdef ANDROID
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long rval = arc4random();
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const int mRBytes = 4;
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#else
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long rval = random();
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#endif
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PRUint8 *src = (PRUint8*)&rval;
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// We want to grab the mRBytes least significant bytes of rval, since
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// mRBytes less than sizeof(rval) means the high bytes are 0.
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#ifdef IS_BIG_ENDIAN
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src += sizeof(rval) - mRBytes;
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#endif
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PRUint8 *dst = ((PRUint8*) id) + (sizeof(nsID) - bytesLeft);
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PRSize toWrite = (bytesLeft < mRBytes ? bytesLeft : mRBytes);
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for (PRSize i = 0; i < toWrite; i++)
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dst[i] = src[i];
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bytesLeft -= toWrite;
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}
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/* Put in the version */
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id->m2 &= 0x0fff;
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id->m2 |= 0x4000;
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/* Put in the variant */
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id->m3[0] &= 0x3f;
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id->m3[0] |= 0x80;
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#ifndef ANDROID
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/* Restore the previous RNG state */
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setstate(mSavedState);
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#endif
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#endif
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return NS_OK;
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}
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