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Annotation of embedaddon/bird2/lib/checksum_test.c, revision 1.1.1.1

1.1       misho       1: /*
                      2:  *     BIRD Library -- IP One-Complement Checksum Tests
                      3:  *
                      4:  *     (c) 2015 CZ.NIC z.s.p.o.
                      5:  *
                      6:  *     Can be freely distributed and used under the terms of the GNU GPL.
                      7:  */
                      8: 
                      9: #include <stdio.h>
                     10: 
                     11: #include "test/birdtest.h"
                     12: 
                     13: #include "lib/checksum.h"
                     14: 
                     15: #define MAX_NUM 10000
                     16: 
                     17: static u16
                     18: ipsum_calculate_expected(u32 *a)
                     19: {
                     20:   int i;
                     21:   u32 sum = 0;
                     22: 
                     23:   for(i = 0; i < MAX_NUM; i++)
                     24:   {
                     25:     sum += a[i] & 0xffff;
                     26:     bt_debug("low) \t0x%08X \n", sum);
                     27: 
                     28:     sum += a[i] >> 16;
                     29:     bt_debug("high) \t0x%08X \n", sum);
                     30: 
                     31:     u16 carry = sum >> 16;
                     32:     sum = (sum & 0xffff) + carry;
                     33:     bt_debug("carry) \t0x%08X \n\n", sum);
                     34:   }
                     35:   bt_debug("sum) \t0x%08X \n", sum);
                     36: 
                     37:   sum = sum ^ 0xffff;
                     38:   bt_debug("~sum) \t0x%08X \n", sum);
                     39: 
                     40:   return sum;
                     41: }
                     42: 
                     43: static int
                     44: t_calculate(void)
                     45: {
                     46:   u32 a[MAX_NUM];
                     47:   int i;
                     48: 
                     49:   for (i = 0; i < MAX_NUM; i++)
                     50:     a[i] = bt_random();
                     51: 
                     52:   u16 sum_calculated   = ipsum_calculate(a, sizeof(a), NULL);
                     53:   u16 sum_calculated_2 = ipsum_calculate(&a[0], sizeof(u32)*(MAX_NUM/2), &a[MAX_NUM/2], sizeof(u32)*(MAX_NUM - MAX_NUM/2), NULL);
                     54:   bt_assert(sum_calculated == sum_calculated_2);
                     55: 
                     56:   u16 sum_expected = ipsum_calculate_expected(a);
                     57: 
                     58:   bt_debug("sum_calculated: %08X \n", sum_calculated);
                     59:   bt_debug("sum_expected:   %08X \n", sum_expected);
                     60: 
                     61:   bt_assert(sum_calculated == sum_expected);
                     62: 
                     63:   return 1;
                     64: }
                     65: 
                     66: static int
                     67: t_verify(void)
                     68: {
                     69:   u32 a[MAX_NUM+1];
                     70:   int i;
                     71: 
                     72:   for (i = 0; i < MAX_NUM; i++)
                     73:     a[i] = bt_random();
                     74: 
                     75:   u16 sum = ipsum_calculate_expected(a);
                     76: 
                     77:   a[MAX_NUM] = sum;
                     78: 
                     79:   bt_assert(ipsum_verify(a, sizeof(a), NULL));
                     80: 
                     81:   return 1;
                     82: }
                     83: 
                     84: 
                     85: int
                     86: main(int argc, char *argv[])
                     87: {
                     88:   bt_init(argc, argv);
                     89: 
                     90:   bt_test_suite(t_calculate, "Checksum of pseudo-random data");
                     91:   bt_test_suite(t_verify, "Verification of pseudo-random data.");
                     92: 
                     93:   return bt_exit_value();
                     94: }