As-gui Sources: as_rand.cpp@0e0eb7c91312 (annotated)

as_rand.cpp@0e0eb7c91312 (annotated)

as_rand.cpp

Thu, 06 Aug 2009 13:21:30 +0200

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Thu, 06 Aug 2009 13:21:30 +0200
changeset 15: 0e0eb7c91312
parent 3: c1941114ca88
permissions: -rw-r--r--

Remove seemingly declarations unnecessary according to Qt 4.5.2 headers.

 //
 //  OSSP asgui - Accounting system graphical user interface
 //  Copyright (c) 2002-2009 The OSSP Project (http://www.ossp.org/)
 //  Copyright (c) 2002-2009 Ralf S. Engelschall <rse@engelschall.com>
 //  Copyright (c) 2002-2009 Michael Schloh von Bennewitz <michael@schloh.com>
 //  Copyright (c) 2002-2009 Cable & Wireless Telecommunications Services GmbH
 //
 //  This file is part of OSSP asgui, an accounting system graphical user
 //  interface which can be found at http://asgui.europalab.com/.
 //
 //  Permission to use, copy, modify, and distribute this software for
 //  any purpose with or without fee is hereby granted, provided that
 //  the above copyright notice and this permission notice appear in all
 //  copies.
 //
 //  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
 //  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 //  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 //  IN NO EVENT SHALL THE AUTHORS AND COPYRIGHT HOLDERS AND THEIR
 //  CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 //  SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 //  LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
 //  USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 //  ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 //  OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 //  OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 //  SUCH DAMAGE.
 //
 //  as_rand.cpp: ISO C++ implementation
 //
 #include <fcntl.h>
 #include <cerrno>
 #include "as_rand.h"
 #if HAVE_UNISTD_H
 #include <unistd.h>
 #endif // HAVE_UNISTD_H
 #if HAVE_STDLIB_H
 #include <stdlib.h>
 #endif // HAVE_STDLIB_H
 #if TIME_WITH_SYS_TIME
 #include <sys/time.h>
 #include <time.h>
 #else
 #if HAVE_SYS_TIME_H
 #include <sys/time.h>
 #else
 #include <time.h>
 #endif // HAVE_SYS_TIME_H
 #endif // TIME_WITH_SYS_TIME
 namespace AS {
 // Constructor
 Rand::Rand(void)
 {
     this->nFd = -4; // Object fresh status
     this->openDevice();   // Open the random device
 //    if (this->nFd < 0)
 //        throw Genexcept("Could not open /dev/urandom or /dev/random.");
 }
 // Destructor
 Rand::~Rand(void)
 {
     this->closeDevice();  // Close the random device
     this->nFd = -4; // Return this object to its fresh status
 }
 //
 // Rand::openDevice(void)
 // Open the random device associated with this object
 //
 void Rand::openDevice(void)
 {
     struct timeval Time;
     if (this->nFd == -4) {  // -4 indicates a fresh object
         gettimeofday(&Time, 0);
         this->nFd = open("/dev/urandom", O_RDONLY);
         if (this->nFd == -1)
             this->nFd = open("/dev/random", O_RDONLY | O_NONBLOCK);
         srand((getpid() << 16) ^ getuid() ^ Time.tv_sec ^ Time.tv_usec); // Seed
     }
     // Improve randomness by stirring in entropy
     gettimeofday(&Time, 0);
     for (int nIter = (Time.tv_sec ^ Time.tv_usec) & 0x1F; nIter > 0; nIter--)
         rand();
 }
 //
 // Rand::closeDevice(void)
 // Close the random device associated with this object
 //
 void Rand::closeDevice(void)
 {
     if (this->nFd >= 0)
         close(this->nFd);
 }
 //
 // Rand::genData(void *pvBuf, int nBytes)
 // Generate a series of random data from the system
 // standard random devices /dev/[u|s]random
 //
 void Rand::genData(void *pBuf, int nBytes)
 {
     int nRead = 0;
     int nLost = 0;
     char *szOut = (char *)pBuf;
     if (this->nFd >= 0) {
         while (nBytes > 0) {
             nRead = read(this->nFd, szOut, nBytes);
             if ((nRead < 0) && ((errno == EINTR) || (errno == EAGAIN)))
                 continue;
             if (nRead <= 0) {
                 if (nLost++ == 8)
                     break;
                 continue;
             }
             nBytes -= nRead;
             szOut += nRead;
             nLost = 0;
         }
     }
     // For systems with no /dev/random, we do the next best thing
     for (int nIter = 0;  nIter< nBytes; nIter++)
         *szOut++ = rand() & 0xFF;
 }
 } // namespace AS

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as_rand.cpp@0e0eb7c91312 (annotated)

as_rand.cpp