blob: 4ef3064d102790d08ae99b764674cf1c76434c8f (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
|
#include "RandomDevice.h"
#include "Limits.h"
#include <AK/StdLib.h>
RandomDevice::RandomDevice()
{
}
RandomDevice::~RandomDevice()
{
}
// Simple rand() and srand() borrowed from the POSIX standard:
static unsigned long next = 1;
#define MY_RAND_MAX 32767
static int myrand()
{
next = next * 1103515245 + 12345;
return((unsigned)(next/((MY_RAND_MAX + 1) * 2)) % (MY_RAND_MAX + 1));
}
#if 0
static void mysrand(unsigned seed)
{
next = seed;
}
#endif
Unix::ssize_t RandomDevice::read(byte* buffer, Unix::size_t bufferSize)
{
const int range = 'z' - 'a';
Unix::ssize_t nread = min(bufferSize, GoodBufferSize);
for (Unix::ssize_t i = 0; i < nread; ++i) {
double r = ((double)myrand() / (double)MY_RAND_MAX) * (double)range;
buffer[i] = 'a' + r;
}
return nread;
}
Unix::ssize_t RandomDevice::write(const byte*, Unix::size_t bufferSize)
{
// FIXME: Use input for entropy? I guess that could be a neat feature?
return min(GoodBufferSize, bufferSize);
}
|
