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Add Random::fillBitsRandomly

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This commit is contained in:
Vinnie Falco
2013-08-02 01:19:23 -07:00
parent 6d974daaf2
commit 91b0c1cd0e
2 changed files with 17 additions and 21 deletions
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31
modules/beast_core/maths/beast_Random.cpp
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@@ -103,23 +103,6 @@ double Random::nextDouble() noexcept
return static_cast <uint32> (nextInt()) / (double) 0xffffffff;
}
void Random::nextBlob (void* buffer, size_t bytes)
{
int const remainder = bytes % sizeof (int64);
{
int64* dest = static_cast <int64*> (buffer);
for (int i = bytes / sizeof (int64); i > 0; --i)
*dest++ = nextInt64 ();
buffer = dest;
}
{
int64 const val = nextInt64 ();
memcpy (buffer, &val, remainder);
}
}
BigInteger Random::nextLargeNumber (const BigInteger& maximumValue)
{
BigInteger n;
@@ -133,6 +116,20 @@ BigInteger Random::nextLargeNumber (const BigInteger& maximumValue)
return n;
}
void Random::fillBitsRandomly (void* const buffer, size_t bytes)
{
int* d = static_cast<int*> (buffer);
for (; bytes >= sizeof (int); bytes -= sizeof (int))
*d++ = nextInt();
if (bytes > 0)
{
const int lastBytes = nextInt();
memcpy (d, &lastBytes, bytes);
}
}
void Random::fillBitsRandomly (BigInteger& arrayToChange, int startBit, int numBits)
{
arrayToChange.setBit (startBit + numBits - 1, true); // to force the array to pre-allocate space