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  1. #include <windows.h>
  2. #include <stdio.h>
  3. #include <stdint.h>
  4.  
  5. void init_by_array(unsigned long init_key[], int key_length);
  6. unsigned long genrand_int32(void);
  7.  
  8. typedef uint32_t Fnv32_t;
  9. Fnv32_t fnv_32a_str(char *str, Fnv32_t hval);
  10.  
  11. constexpr int N_MEGA  = (1024 * 1024);
  12. static_assert(N_MEGA % sizeof(int) == 0);
  13. static_assert(sizeof(int) == sizeof(LONG));
  14.  
  15. mySrand(unsigned long init[]) {
  16.   char buff[256] = {0x00,};
  17.   Fnv32_t hval = 0;
  18.   SYSTEMTIME systime;
  19.   ::GetLocalTime(&systime);
  20.   sprintf(buff, "%d%d%d%d%d%d%d%d",
  21.           systime.wYear
  22.           ,systime.wMonth
  23.           ,systime.wDay
  24.           ,systime.wDayOfWeek
  25.           ,systime.wHour
  26.           ,systime.wMinute
  27.           ,systime.wSecond
  28.           ,systime.wMilliseconds);
  29.   hval = init[0] = fnv_32a_str(buff, hval);
  30.   hval = init[1] = fnv_32a_str(buff, hval);
  31.   hval = init[2] = fnv_32a_str(buff, hval);
  32.   init[3] = fnv_32a_str(buff, hval);
  33. }
  34.  
  35.  
  36. MyWriteFile(HANDLE h, int *buff, int nbyte) {
  37.   unsigned long int actualWrite;
  38.   int c = 0;
  39.   for (;;) {
  40.     ::WriteFile(h, buff, nbyte, &actualWrite, 0);
  41.     if (actualWrite == nbyte)
  42.       break;
  43.     printf("[%d] actualWrite = %d\n", c++, actualWrite);
  44.   }
  45. }
  46.  
  47. int main(int argc, char **argv) {
  48.   HANDLE h;
  49.   volatile LONG dmy;
  50.  
  51.   if (argc != 3) {
  52.     fprintf(stderr, "usage: %s <size> <file>\n", argv[0]);
  53.     exit(-1);
  54.   }
  55.  
  56.   int psize = atoi(argv[1]);
  57.   if (psize == 0) {
  58.     fprintf(stderr, "%s: not available size = %d\n", argv[0], argv[1]);    
  59.     exit(1);
  60.   }
  61.  
  62.   int *buff = (int *)malloc(N_MEGA * psize);
  63.   if (buff == 0) {
  64.     fprintf(stderr, "%s: cannot allocate needed memory : %d MiByte.\n", argv[0], psize);    
  65.     exit(1);
  66.   }
  67.  
  68.   /* srand() */
  69.   unsigned long init[4], length=4;
  70.   mySrand(init);
  71.   init_by_array(init, length);
  72.  
  73.   int n = 0;
  74.   h = ::CreateFile(argv[2], GENERIC_WRITE, 0, 0, OPEN_ALWAYS, 0, 0);
  75.   if (h != INVALID_HANDLE_VALUE) {
  76.     for (;;) {
  77.       dmy = 0;
  78.       ::SetFilePointer(h, 0, (LONG * volatile)&dmy, FILE_END);
  79.       for (int i = 0; i < psize * N_MEGA / sizeof(int); i++) {
  80.         buff[i] = genrand_int32();
  81.       }
  82.       MyWriteFile(h, buff, psize * N_MEGA);
  83.       ::FlushFileBuffers(h);
  84.       printf("<%d>\n", n++);
  85.     }
  86.     ::CloseHandle(h);
  87.   } else {
  88.     printf("cannot open the file %s\n", argv[2]);
  89.     exit(1);
  90.   }
  91.   free(buff);
  92.   printf("stoped.\n");
  93.   return 0;
  94. }
  95.  
  96. /* 
  97.    A C-program for MT19937, with initialization improved 2002/1/26.
  98.    Coded by Takuji Nishimura and Makoto Matsumoto.
  99. */
  100.  
  101. #include <stdio.h>
  102.  
  103. /* Period parameters */  
  104. #define N 624
  105. #define M 397
  106. #define MATRIX_A 0x9908b0dfUL   /* constant vector a */
  107. #define UPPER_MASK 0x80000000UL /* most significant w-r bits */
  108. #define LOWER_MASK 0x7fffffffUL /* least significant r bits */
  109.  
  110. static unsigned long mt[N]; /* the array for the state vector  */
  111. static int mti=N+1; /* mti==N+1 means mt[N] is not initialized */
  112.  
  113. void init_genrand(unsigned long s)
  114. {
  115.     mt[0]= s & 0xffffffffUL;
  116.     for (mti=1; mti<N; mti++) {
  117.         mt[mti] = 
  118.           (1812433253UL * (mt[mti-1] ^ (mt[mti-1] >> 30)) + mti); 
  119.         /* See Knuth TAOCP Vol2. 3rd Ed. P.106 for multiplier. */
  120.         /* In the previous versions, MSBs of the seed affect   */
  121.         /* only MSBs of the array mt[].                        */
  122.         /* 2002/01/09 modified by Makoto Matsumoto             */
  123.         mt[mti] &= 0xffffffffUL;
  124.         /* for >32 bit machines */
  125.     }
  126. }
  127.  
  128. void init_by_array(unsigned long init_key[], int key_length)
  129. {
  130.     int i, j, k;
  131.     init_genrand(19650218UL);
  132.     i=1; j=0;
  133.     k = (N>key_length ? N : key_length);
  134.     for (; k; k--) {
  135.         mt[i] = (mt[i] ^ ((mt[i-1] ^ (mt[i-1] >> 30)) * 1664525UL))
  136.           + init_key[j] + j;
  137.         mt[i] &= 0xffffffffUL;
  138.         i++; j++;
  139.         if (i>=N) { mt[0] = mt[N-1]; i=1; }
  140.         if (j>=key_length) j=0;
  141.     }
  142.     for (k=N-1; k; k--) {
  143.         mt[i] = (mt[i] ^ ((mt[i-1] ^ (mt[i-1] >> 30)) * 1566083941UL))
  144.           - i;
  145.         mt[i] &= 0xffffffffUL;
  146.         i++;
  147.         if (i>=N) { mt[0] = mt[N-1]; i=1; }
  148.     }
  149.  
  150.     mt[0] = 0x80000000UL; /* MSB is 1; assuring non-zero initial array */ 
  151. }
  152.  
  153. /* generates a random number on [0,0xffffffff]-interval */
  154. unsigned long genrand_int32(void)
  155. {
  156.     unsigned long y;
  157.     static unsigned long mag01[2]={0x0UL, MATRIX_A};
  158.     /* mag01[x] = x * MATRIX_A  for x=0,1 */
  159.  
  160.     if (mti >= N) { /* generate N words at one time */
  161.         int kk;
  162.  
  163.         if (mti == N+1)   /* if init_genrand() has not been called, */
  164.             init_genrand(5489UL); /* a default initial seed is used */
  165.  
  166.         for (kk=0;kk<N-M;kk++) {
  167.             y = (mt[kk]&UPPER_MASK)|(mt[kk+1]&LOWER_MASK);
  168.             mt[kk] = mt[kk+M] ^ (y >> 1) ^ mag01[y & 0x1UL];
  169.         }
  170.         for (;kk<N-1;kk++) {
  171.             y = (mt[kk]&UPPER_MASK)|(mt[kk+1]&LOWER_MASK);
  172.             mt[kk] = mt[kk+(M-N)] ^ (y >> 1) ^ mag01[y & 0x1UL];
  173.         }
  174.         y = (mt[N-1]&UPPER_MASK)|(mt[0]&LOWER_MASK);
  175.         mt[N-1] = mt[M-1] ^ (y >> 1) ^ mag01[y & 0x1UL];
  176.  
  177.         mti = 0;
  178.     }
  179.  
  180.     y = mt[mti++];
  181.  
  182.     /* Tempering */
  183.     y ^= (y >> 11);
  184.     y ^= (y << 7) & 0x9d2c5680UL;
  185.     y ^= (y << 15) & 0xefc60000UL;
  186.     y ^= (y >> 18);
  187.  
  188.     return y;
  189. }
  190.  
  191. /*--------------------*\
  192.   /*
  193.  * hash_32 - 32 bit Fowler/Noll/Vo FNV-1a hash code
  194.  *
  195. */
  196.  
  197. #include <stdlib.h>
  198. /*#include "fnv.h"*/
  199.  
  200. #define FNV1_32_INIT ((Fnv32_t)0x811c9dc5)
  201. #define FNV1_32A_INIT FNV1_32_INIT
  202. #define FNV_32_PRIME ((Fnv32_t)0x01000193)
  203.  
  204. /*
  205.  * fnv_32a_str - perform a 32 bit Fowler/Noll/Vo FNV-1a hash on a string
  206.  *
  207.  * input:
  208.  *	str	- string to hash
  209.  *	hval	- previous hash value or 0 if first call
  210.  *
  211.  * returns:
  212.  *	32 bit hash as a static hash type
  213.  *
  214.  * NOTE: To use the recommended 32 bit FNV-1a hash, use FNV1_32A_INIT as the
  215.  *  	 hval arg on the first call to either fnv_32a_buf() or fnv_32a_str().
  216.  */
  217. Fnv32_t fnv_32a_str(char *str, Fnv32_t hval)
  218. {
  219.   unsigned char *s = (unsigned char *)str;	/* unsigned string */
  220.  
  221.   while (*s) {
  222.     hval ^= (Fnv32_t)*s++;
  223.     hval += (hval<<1) + (hval<<4) + (hval<<7) + (hval<<8) + (hval<<24);
  224.   }
  225.  
  226.   return hval;
  227. }
  228.  
  229. /* end */
  230.  
Compilation error #stdin compilation error #stdout 0s 0KB
comments (?)
stdin 
Standard input is empty
compilation info 
prog.cpp:1:10: fatal error: windows.h: No such file or directory
 #include <windows.h>
          ^~~~~~~~~~~
compilation terminated.
stdout 
Standard output is empty
https://ideone.com/JLLsUA
language:
C++14 (gcc 8.3)
created:
5 years ago
visibility:
secret

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