contrib/bzip2/spewG.c

   1
   2 /* spew out a thoroughly gigantic file designed so that bzip2
   3    can compress it reasonably rapidly.  This is to help test
   4    support for large files (> 2GB) in a reasonable amount of time.
   5    I suggest you use the undocumented --exponential option to
   6    bzip2 when compressing the resulting file; this saves a bit of
   7    time.  Note: *don't* bother with --exponential when compressing
   8    Real Files; it'll just waste a lot of CPU time :-)
   9    (but is otherwise harmless).
  10 */
  11
  12 #define _FILE_OFFSET_BITS 64
  13
  14 #include <stdio.h>
  15 #include <stdlib.h>
  16
  17 /* The number of megabytes of junk to spew out (roughly) */
  18 #define MEGABYTES 5000
  19
  20 #define N_BUF 1000000
  21 char buf[N_BUF];
  22
  23 int main ( int argc, char** argv )
  24 {
  25    int ii, kk, p;
  26    srandom(1);
  27    setbuffer ( stdout, buf, N_BUF );
  28    for (kk = 0; kk < MEGABYTES * 515; kk+=3) {
  29       p = 25+random()%50;
  30       for (ii = 0; ii < p; ii++)
  31          printf ( "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa" );
  32       for (ii = 0; ii < p-1; ii++)
  33          printf ( "bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb" );
  34       for (ii = 0; ii < p+1; ii++)
  35          printf ( "ccccccccccccccccccccccccccccccccccccc" );
  36    }
  37    fflush(stdout);
  38    return 0;
  39 }