check_bits.c

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#include <check.h>

#include <bits.h>

START_TEST(test_getbitu)
{
  u8 test_data[] = {
    0x01, 0x23, 0x45, 0x67, 0x89, 0xAB, 0xCD, 0xEF
  };

  u32 ret;

  ret = getbitu(test_data, 0, 8);
  fail_unless(ret == 0x01,
      "Test case 1 expected 0x01, got 0x%02X", ret);

  ret = getbitu(test_data, 4, 8);
  fail_unless(ret == 0x12,
      "test case 2 expected 0x12, got 0x%02X", ret);

  ret = getbitu(test_data, 28, 16);
  fail_unless(ret == 0x789A,
      "test case 3 expected 0x789A, got 0x%04X", ret);

  ret = getbitu(test_data, 12, 32);
  fail_unless(ret == 0x3456789A,
      "test case 4 expected 0x3456789A, got 0x%08X", ret);

  ret = getbitu(test_data, 10, 3);
  fail_unless(ret == 0x4,
      "test case 5 expected 0x4, got 0x%01X", ret);

  ret = getbitu(test_data, 10, 13);
  fail_unless(ret == 0x11A2,
      "test case 6 expected 0x11A2, got 0x%04X", ret);
}
END_TEST

START_TEST(test_getbits)
{
  u8 test_data[] = {
    0x00, 0x03, 0x80, 0xFF, 0xFF, 0xFF, 0xFF
  };

  s32 ret;

  ret = getbits(test_data, 0, 8);
  fail_unless(ret == 0,
      "Test case 1 expected 0, got %d", ret);

  ret = getbits(test_data, 13, 3);
  fail_unless(ret == 3,
      "Test case 2 expected 3, got %d", ret);

  ret = getbits(test_data, 14, 3);
  fail_unless(ret == -1,
      "Test case 3 expected -1, got %d", ret);

  ret = getbits(test_data, 14, 4);
  fail_unless(ret == -2,
      "Test case 4 expected -2, got %d", ret);

  ret = getbits(test_data, 24, 32);
  fail_unless(ret == -1,
      "Test case 5 expected -1, got %d", ret);
}
END_TEST

START_TEST(test_setbitu)
{
  u8 test_data[10];

  u32 ret;

  setbitu(test_data, 10, 13, 0x11A2);
  ret = getbitu(test_data, 10, 13);
  fail_unless(ret == 0x11A2,
      "test case 1 expected 0x11A2, got 0x%04X", ret);

  /* TODO: Check that setbitu doesn't write to bits other than those in the bit
   * field. */
}
END_TEST

START_TEST(test_setbits)
{
  u8 test_data[10];

  s32 ret;

  setbits(test_data, 14, 3, -1);
  ret = getbits(test_data, 14, 3);
  fail_unless(ret == -1,
      "Test case 1 expected -1, got %d", ret);

  setbits(test_data, 14, 8, 22);
  ret = getbits(test_data, 14, 8);
  fail_unless(ret == 22,
      "Test case 2 expected 22, got %d", ret);

  setbits(test_data, 24, 32, -1);
  ret = getbits(test_data, 24, 32);
  fail_unless(ret == -1,
      "Test case 3 expected -1, got %d", ret);
}
END_TEST

Suite* bits_suite(void)
{
  Suite *s = suite_create("Bit Utils");

  TCase *tc_core = tcase_create("Core");
  tcase_add_test(tc_core, test_getbitu);
  tcase_add_test(tc_core, test_getbits);
  tcase_add_test(tc_core, test_setbitu);
  tcase_add_test(tc_core, test_setbits);
  suite_add_tcase(s, tc_core);

  return s;
}