Random Numbers: Difference between revisions
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Mine GO BOOM (talk | contribs) m Reverted edit of Zc321, changed back to last version by Cyan~Fire |
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[[SubSpace]] uses random numbers primarily in its encryption, generating [[prize]]s, and controlling [[door]]s. | |||
The following code is used in generating the encrypted keystream, prizes, and doors: | |||
<pre> | |||
#define MULT_C 0x834E0B5F | |||
#define DIV_C 0x1F31D | |||
DWORD SS_RNG(DWORD seed) | |||
{ | |||
DWORD nseed, temp; | |||
temp = (MULT_C * (unsigned __int64)seed) >> 32; | |||
temp = (temp >> 16) + (temp >> 31); //aka the sign bit | |||
nseed = (seed % DIV_C) * 16807; | |||
nseed -= (temp * 2836); | |||
nseed += 123; | |||
if (!nseed || nseed > 0x7FFFFFFF) | |||
nseed += 0x7FFFFFFF; | |||
return nseed; | |||
} | |||
</pre> | |||
[[Category:Game Intricacies]] | |||
Latest revision as of 07:53, 30 November 2005
SubSpace uses random numbers primarily in its encryption, generating prizes, and controlling doors.
The following code is used in generating the encrypted keystream, prizes, and doors:
#define MULT_C 0x834E0B5F
#define DIV_C 0x1F31D
DWORD SS_RNG(DWORD seed)
{
DWORD nseed, temp;
temp = (MULT_C * (unsigned __int64)seed) >> 32;
temp = (temp >> 16) + (temp >> 31); //aka the sign bit
nseed = (seed % DIV_C) * 16807;
nseed -= (temp * 2836);
nseed += 123;
if (!nseed || nseed > 0x7FFFFFFF)
nseed += 0x7FFFFFFF;
return nseed;
}
