oss-fuzz/fuzz-date.c

   1 #include "git-compat-util.h"
   2 #include "date.h"
   3
   4 int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size);
   5
   6 int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size)
   7 {
   8         int local;
   9         int num;
  10         char *str;
  11         int16_t tz;
  12         timestamp_t ts;
  13         enum date_mode_type dmtype;
  14         struct date_mode dm;
  15
  16         if (size <= 4)
  17                 /*
  18                  * we use the first byte to fuzz dmtype and the
  19                  * second byte to fuzz local, then the next two
  20                  * bytes to fuzz tz offset. The remainder
  21                  * (at least one byte) is fed as input to
  22                  * approxidate_careful().
  23                  */
  24                 return 0;
  25
  26         local = !!(*data++ & 0x10);
  27         num = *data++ % DATE_UNIX;
  28         if (num >= DATE_STRFTIME)
  29                 num++;
  30         dmtype = (enum date_mode_type)num;
  31         size -= 2;
  32
  33         tz = *data++;
  34         tz = (tz << 8) | *data++;
  35         size -= 2;
  36
  37         str = xmemdupz(data, size);
  38
  39         ts = approxidate_careful(str, &num);
  40         free(str);
  41
  42         dm = date_mode_from_type(dmtype);
  43         dm.local = local;
  44         show_date(ts, (int)tz, dm);
  45
  46         date_mode_release(&dm);
  47
  48         return 0;
  49 }