#include <rtprandomurandom.h>

Inheritance diagram for qrtplib::RTPRandomURandom:

Collaboration diagram for qrtplib::RTPRandomURandom:

Public Member Functions
	RTPRandomURandom ()

	~RTPRandomURandom ()

int	Init ()

uint8_t	GetRandom8 ()

uint16_t	GetRandom16 ()

uint32_t	GetRandom32 ()

double	GetRandomDouble ()

Public Member Functions inherited from qrtplib::RTPRandom
	RTPRandom ()

virtual	~RTPRandom ()

uint32_t	PickSeed ()

Private Attributes
FILE *	device

Additional Inherited Members
Static Public Member Functions inherited from qrtplib::RTPRandom
static RTPRandom *	CreateDefaultRandomNumberGenerator ()

Detailed Description

A random number generator which uses bytes delivered by the /dev/urandom device.

Definition at line 51 of file rtprandomurandom.h.

Constructor & Destructor Documentation

◆ RTPRandomURandom()

qrtplib::RTPRandomURandom::RTPRandomURandom ( )

Definition at line 41 of file rtprandomurandom.cpp.

References device.

 {
     device = 0;
 }

◆ ~RTPRandomURandom()

qrtplib::RTPRandomURandom::~RTPRandomURandom ( )

Definition at line 46 of file rtprandomurandom.cpp.

References device.

 {
     if (device) {
         fclose(device);
     }
 }

Member Function Documentation

◆ GetRandom16()

uint16_t qrtplib::RTPRandomURandom::GetRandom16 ( )

virtual

Returns a random sixteen bit value.

Implements qrtplib::RTPRandom.

Definition at line 87 of file rtprandomurandom.cpp.

References device.

 {
     if (!device)
     {
         qWarning("RTPRandomURandom::GetRandom16: no device");
         return 0;
     }
 
     uint16_t value;
 
     if (fread(&value, 1, sizeof(uint16_t), device) != sizeof(uint16_t))
     {
         qWarning("RTPRandomURandom::GetRandom16: cannot read unsigned 16 bit value from device");
         return 0;
     }
 
     return value;
 }

◆ GetRandom32()

uint32_t qrtplib::RTPRandomURandom::GetRandom32 ( )

virtual

Returns a random thirty-two bit value.

Implements qrtplib::RTPRandom.

Definition at line 106 of file rtprandomurandom.cpp.

References device.

 {
     if (!device)
     {
         qWarning("RTPRandomURandom::GetRandom32: no device");
         return 0;
     }
 
     uint32_t value;
 
     if (fread(&value, 1, sizeof(uint32_t), device) != sizeof(uint32_t))
     {
         qWarning("RTPRandomURandom::GetRandom32: cannot read unsigned 32 bit value from device");
         return 0;
     }
 
     return value;
 }

◆ GetRandom8()

uint8_t qrtplib::RTPRandomURandom::GetRandom8 ( )

virtual

Returns a random eight bit value.

Implements qrtplib::RTPRandom.

Definition at line 68 of file rtprandomurandom.cpp.

References device.

 {
     if (!device)
     {
         qWarning("RTPRandomURandom::GetRandom8: no device");
         return 0;
     }
 
     uint8_t value;
 
     if (fread(&value, 1, sizeof(uint8_t), device) != sizeof(uint8_t))
     {
         qWarning("RTPRandomURandom::GetRandom8: cannot read unsigned 8 bit value from device");
         return 0;
     }
 
     return value;
 }

◆ GetRandomDouble()

double qrtplib::RTPRandomURandom::GetRandomDouble ( )

virtual

Returns a random number between $0.0$ and $1.0$.

Implements qrtplib::RTPRandom.

Definition at line 125 of file rtprandomurandom.cpp.

References device, and RTPRANDOM_2POWMIN63.

 {
     if (!device)
     {
         qWarning("RTPRandomURandom::GetRandomDouble: no device");
         return 0;
     }
 
     uint64_t value;
 
     if (fread(&value, 1, sizeof(uint64_t), device) != sizeof(uint64_t))
     {
         qWarning("RTPRandomURandom::GetRandomDouble: cannot read unsigned 64 bit value from device");
         return 0;
     }
 
     value &= 0x7fffffffffffffffULL;
     int64_t value2 = (int64_t) value;
     double x = RTPRANDOM_2POWMIN63 * (double) value2;
 
     return x;
 }

◆ Init()

int qrtplib::RTPRandomURandom::Init ( )

Initialize the random number generator.

Definition at line 53 of file rtprandomurandom.cpp.

References device, ERR_RTP_RTPRANDOMURANDOM_ALREADYOPEN, and ERR_RTP_RTPRANDOMURANDOM_CANTOPEN.

Referenced by qrtplib::RTPRandom::CreateDefaultRandomNumberGenerator().

 {
     if (device) {
         return ERR_RTP_RTPRANDOMURANDOM_ALREADYOPEN;
     }
 
     device = fopen("/dev/urandom", "rb");
 
     if (device == 0) {
         return ERR_RTP_RTPRANDOMURANDOM_CANTOPEN;
     }
 
     return 0;
 }