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os2rng.c

/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is the Netscape Portable Runtime (NSPR).
 *
 * The Initial Developer of the Original Code is
 * Netscape Communications Corporation.
 * Portions created by the Initial Developer are Copyright (C) 1999-2000
 * the Initial Developer. All Rights Reserved.
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 *
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 * either the GNU General Public License Version 2 or later (the "GPL"), or
 * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
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#define INCL_DOS
#define INCL_DOSERRORS
#include <os2.h>
#include <stdlib.h>
#include <time.h>
#include "primpl.h"

static BOOL clockTickTime(unsigned long *phigh, unsigned long *plow)
{
    APIRET rc = NO_ERROR;
    QWORD qword = {0,0};

    rc = DosTmrQueryTime(&qword);
    if (rc != NO_ERROR)
       return FALSE;

    *phigh = qword.ulHi;
    *plow  = qword.ulLo;

    return TRUE;
}

extern PRSize _PR_MD_GetRandomNoise(void *buf, PRSize size )
{
    unsigned long high = 0;
    unsigned long low  = 0;
    clock_t val = 0;
    int n = 0;
    int nBytes = 0;
    time_t sTime;

    if (size <= 0)
       return 0;

    clockTickTime(&high, &low);

    /* get the maximally changing bits first */
    nBytes = sizeof(low) > size ? size : sizeof(low);
    memcpy(buf, &low, nBytes);
    n += nBytes;
    size -= nBytes;

    if (size <= 0)
       return n;

    nBytes = sizeof(high) > size ? size : sizeof(high);
    memcpy(((char *)buf) + n, &high, nBytes);
    n += nBytes;
    size -= nBytes;

    if (size <= 0)
       return n;

    /* get the number of milliseconds that have elapsed since application started */
    val = clock();

    nBytes = sizeof(val) > size ? size : sizeof(val);
    memcpy(((char *)buf) + n, &val, nBytes);
    n += nBytes;
    size -= nBytes;

    if (size <= 0)
       return n;

    /* get the time in seconds since midnight Jan 1, 1970 */
    time(&sTime);
    nBytes = sizeof(sTime) > size ? size : sizeof(sTime);
    memcpy(((char *)buf) + n, &sTime, nBytes);
    n += nBytes;

    return n;
}

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