klbvfs.c

int file_xRead(sqlite3_file *file,byte *dst,int iAmt,int64_t iOfst)

{
  uint highbits;
  uint bit33to32_or_shiftright1;
  ulonglong tmpoff;
  int xReadResult;
  int random1;
  int random3;
  int random_multiplier;
  klbvfs_file *klbfile;
  int random2;
  int rand_seed;
  int random4;
  int key1;
  
  xReadResult = (**(code **)(*(int *)((int)&file->pMethods + g_defaultSzOsFile) + 8))
                          (file,dst,iAmt,iOfst);
  if (xReadResult == 0) {
    random2 = 0x343fd;
    random1 = 0x269ec3;
    klbfile = (klbvfs_file *)((int)&file->pMethods + g_defaultSzOsFile);
    key1 = klbfile->key1;
                    /* checks if iOfst is zero? */
    if ((int)(iOfst._4_4_ - (uint)((int)iOfst == 0)) < 0) {
      random1 = 0;
      random2 = klbfile->key2;
      random_multiplier = klbfile->key3;
      rand_seed = 1;
    }
    else {
      random_multiplier = 1;
      rand_seed = 0;
      tmpoff = iOfst;
      do {
        if ((tmpoff & 1) != 0) {
          rand_seed = random_multiplier * random1 + rand_seed;
          random_multiplier = random_multiplier * random2;
        }
        highbits = (uint)(tmpoff >> 0x21);
        bit33to32_or_shiftright1 = (uint)((byte)(tmpoff >> 0x20) & 1) << 0x1f | (uint)tmpoff >> 1;
        tmpoff = CONCAT44(highbits,bit33to32_or_shiftright1);
        random1 = random2 * random1 + random1;
        random2 = random2 * random2;
      } while ((bit33to32_or_shiftright1 | highbits) != 0);
      random1 = 1;
      random3 = 0x269ec3;
      key1 = random_multiplier * key1 + rand_seed;
      random2 = 0;
      rand_seed = 0x343fd;
      tmpoff = iOfst;
      do {
        if ((tmpoff & 1) != 0) {
          random2 = random1 * random3 + random2;
          random1 = random1 * rand_seed;
        }
        highbits = (uint)(tmpoff >> 0x21);
        bit33to32_or_shiftright1 = (uint)((byte)(tmpoff >> 0x20) & 1) << 0x1f | (uint)tmpoff >> 1;
        tmpoff = CONCAT44(highbits,bit33to32_or_shiftright1);
        random3 = rand_seed * random3 + random3;
        rand_seed = rand_seed * rand_seed;
      } while ((bit33to32_or_shiftright1 | highbits) != 0);
      random2 = random1 * klbfile->key2 + random2;
      random_multiplier = klbfile->key3;
      rand_seed = 1;
      random1 = 0;
      random3 = 0x269ec3;
      random4 = 0x343fd;
      do {
        if ((iOfst & 1U) != 0) {
          random1 = rand_seed * random3 + random1;
          rand_seed = rand_seed * random4;
        }
        highbits = (uint)((ulonglong)iOfst >> 0x21);
        bit33to32_or_shiftright1 =
             (uint)((byte)((ulonglong)iOfst >> 0x20) & 1) << 0x1f | (uint)iOfst >> 1;
        iOfst = CONCAT44(highbits,bit33to32_or_shiftright1);
        random3 = random4 * random3 + random3;
        random4 = random4 * random4;
      } while ((bit33to32_or_shiftright1 | highbits) != 0);
    }
    if (0 < iAmt) {
      random1 = rand_seed * random_multiplier + random1;
      do {
        highbits = (uint)key1 >> 0x18;
        key1 = key1 * 0x343fd + 0x269ec3;
        iAmt = iAmt + -1;
        *dst = *dst ^ (byte)((uint)random2 >> 0x18) ^ (byte)highbits ^ (byte)((uint)random1 >> 0x18)
        ;
        random1 = random1 * 0x343fd + 0x269ec3;
        random2 = random2 * 0x343fd + 0x269ec3;
        dst = dst + 1;
      } while (iAmt != 0);
    }
  }
  return xReadResult;
}