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@@ -42,27 +42,32 @@ BEGIN_JUCE_NAMESPACE |
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//==============================================================================
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Uuid::Uuid()
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{
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// do some serious mixing up of our MAC addresses and different types of time info,
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// plus a couple of passes of pseudo-random numbers over the whole thing.
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SystemStats::getMACAddresses (value.asInt64, 2);
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// Mix up any available MAC addresses with some time-based pseudo-random numbers
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// to make it very very unlikely that two UUIDs will ever be the same..
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int i;
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for (i = 16; --i >= 0;)
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{
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Random r (Time::getHighResolutionTicks()
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+ Random::getSystemRandom().nextInt()
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+ value.asInt [i & 3]);
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static int64 macAddresses[2];
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static bool hasCheckedMacAddresses = false;
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value.asBytes[i] ^= (uint8) r.nextInt();
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if (! hasCheckedMacAddresses)
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{
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hasCheckedMacAddresses = true;
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SystemStats::getMACAddresses (macAddresses, 2);
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}
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value.asInt64 [0] ^= Time::getHighResolutionTicks();
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value.asInt64 [1] ^= Time::currentTimeMillis();
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value.asInt64[0] = macAddresses[0];
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value.asInt64[1] = macAddresses[1];
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// We'll use both a local RNG that is re-seeded, plus the shared RNG,
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// whose seed will carry over between calls to this method.
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Random r (macAddresses[0] ^ macAddresses[1]
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^ Random::getSystemRandom().nextInt64());
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for (i = 4; --i >= 0;)
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for (int i = 4; --i >= 0;)
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{
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Random r (Time::getHighResolutionTicks() ^ value.asInt[i]);
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r.setSeedRandomly(); // calling this repeatedly improves randomness
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value.asInt[i] ^= r.nextInt();
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value.asInt[i] ^= Random::getSystemRandom().nextInt();
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}
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}
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jules