src/test/test-unaligned.c

   1 /***
   2   This file is part of systemd
   3
   4   Copyright 2014 Tom Gundersen
   5
   6   systemd is free software; you can redistribute it and/or modify it
   7   under the terms of the GNU Lesser General Public License as published by
   8   the Free Software Foundation; either version 2.1 of the License, or
   9   (at your option) any later version.
  10
  11   systemd is distributed in the hope that it will be useful, but
  12   WITHOUT ANY WARRANTY; without even the implied warranty of
  13   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  14   Lesser General Public License for more details.
  15
  16   You should have received a copy of the GNU Lesser General Public License
  17   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  18 ***/
  19
  20 #include "sparse-endian.h"
  21 #include "unaligned.h"
  22 #include "util.h"
  23
  24 static uint8_t data[] = {
  25         0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
  26         0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f,
  27 };
  28
  29 static void test_be(void) {
  30         uint8_t scratch[16];
  31
  32         assert_se(unaligned_read_be16(&data[0]) == 0x0001);
  33         assert_se(unaligned_read_be16(&data[1]) == 0x0102);
  34
  35         assert_se(unaligned_read_be32(&data[0]) == 0x00010203);
  36         assert_se(unaligned_read_be32(&data[1]) == 0x01020304);
  37         assert_se(unaligned_read_be32(&data[2]) == 0x02030405);
  38         assert_se(unaligned_read_be32(&data[3]) == 0x03040506);
  39
  40         assert_se(unaligned_read_be64(&data[0]) == 0x0001020304050607);
  41         assert_se(unaligned_read_be64(&data[1]) == 0x0102030405060708);
  42         assert_se(unaligned_read_be64(&data[2]) == 0x0203040506070809);
  43         assert_se(unaligned_read_be64(&data[3]) == 0x030405060708090a);
  44         assert_se(unaligned_read_be64(&data[4]) == 0x0405060708090a0b);
  45         assert_se(unaligned_read_be64(&data[5]) == 0x05060708090a0b0c);
  46         assert_se(unaligned_read_be64(&data[6]) == 0x060708090a0b0c0d);
  47         assert_se(unaligned_read_be64(&data[7]) == 0x0708090a0b0c0d0e);
  48
  49         zero(scratch);
  50         unaligned_write_be16(&scratch[0], 0x0001);
  51         assert_se(memcmp(&scratch[0], &data[0], sizeof(uint16_t)) == 0);
  52         zero(scratch);
  53         unaligned_write_be16(&scratch[1], 0x0102);
  54         assert_se(memcmp(&scratch[1], &data[1], sizeof(uint16_t)) == 0);
  55
  56         zero(scratch);
  57         unaligned_write_be32(&scratch[0], 0x00010203);
  58         assert_se(memcmp(&scratch[0], &data[0], sizeof(uint32_t)) == 0);
  59         zero(scratch);
  60         unaligned_write_be32(&scratch[1], 0x01020304);
  61         assert_se(memcmp(&scratch[1], &data[1], sizeof(uint32_t)) == 0);
  62         zero(scratch);
  63         unaligned_write_be32(&scratch[2], 0x02030405);
  64         assert_se(memcmp(&scratch[2], &data[2], sizeof(uint32_t)) == 0);
  65         zero(scratch);
  66         unaligned_write_be32(&scratch[3], 0x03040506);
  67         assert_se(memcmp(&scratch[3], &data[3], sizeof(uint32_t)) == 0);
  68
  69         zero(scratch);
  70         unaligned_write_be64(&scratch[0], 0x0001020304050607);
  71         assert_se(memcmp(&scratch[0], &data[0], sizeof(uint64_t)) == 0);
  72         zero(scratch);
  73         unaligned_write_be64(&scratch[1], 0x0102030405060708);
  74         assert_se(memcmp(&scratch[1], &data[1], sizeof(uint64_t)) == 0);
  75         zero(scratch);
  76         unaligned_write_be64(&scratch[2], 0x0203040506070809);
  77         assert_se(memcmp(&scratch[2], &data[2], sizeof(uint64_t)) == 0);
  78         zero(scratch);
  79         unaligned_write_be64(&scratch[3], 0x030405060708090a);
  80         assert_se(memcmp(&scratch[3], &data[3], sizeof(uint64_t)) == 0);
  81         zero(scratch);
  82         unaligned_write_be64(&scratch[4], 0x0405060708090a0b);
  83         assert_se(memcmp(&scratch[4], &data[4], sizeof(uint64_t)) == 0);
  84         zero(scratch);
  85         unaligned_write_be64(&scratch[5], 0x05060708090a0b0c);
  86         assert_se(memcmp(&scratch[5], &data[5], sizeof(uint64_t)) == 0);
  87         zero(scratch);
  88         unaligned_write_be64(&scratch[6], 0x060708090a0b0c0d);
  89         assert_se(memcmp(&scratch[6], &data[6], sizeof(uint64_t)) == 0);
  90         zero(scratch);
  91         unaligned_write_be64(&scratch[7], 0x0708090a0b0c0d0e);
  92         assert_se(memcmp(&scratch[7], &data[7], sizeof(uint64_t)) == 0);
  93 }
  94
  95 static void test_le(void) {
  96         uint8_t scratch[16];
  97
  98         assert_se(unaligned_read_le16(&data[0]) == 0x0100);
  99         assert_se(unaligned_read_le16(&data[1]) == 0x0201);
 100
 101         assert_se(unaligned_read_le32(&data[0]) == 0x03020100);
 102         assert_se(unaligned_read_le32(&data[1]) == 0x04030201);
 103         assert_se(unaligned_read_le32(&data[2]) == 0x05040302);
 104         assert_se(unaligned_read_le32(&data[3]) == 0x06050403);
 105
 106         assert_se(unaligned_read_le64(&data[0]) == 0x0706050403020100);
 107         assert_se(unaligned_read_le64(&data[1]) == 0x0807060504030201);
 108         assert_se(unaligned_read_le64(&data[2]) == 0x0908070605040302);
 109         assert_se(unaligned_read_le64(&data[3]) == 0x0a09080706050403);
 110         assert_se(unaligned_read_le64(&data[4]) == 0x0b0a090807060504);
 111         assert_se(unaligned_read_le64(&data[5]) == 0x0c0b0a0908070605);
 112         assert_se(unaligned_read_le64(&data[6]) == 0x0d0c0b0a09080706);
 113         assert_se(unaligned_read_le64(&data[7]) == 0x0e0d0c0b0a090807);
 114
 115         zero(scratch);
 116         unaligned_write_le16(&scratch[0], 0x0100);
 117         assert_se(memcmp(&scratch[0], &data[0], sizeof(uint16_t)) == 0);
 118         zero(scratch);
 119         unaligned_write_le16(&scratch[1], 0x0201);
 120         assert_se(memcmp(&scratch[1], &data[1], sizeof(uint16_t)) == 0);
 121
 122         zero(scratch);
 123         unaligned_write_le32(&scratch[0], 0x03020100);
 124
 125         assert_se(memcmp(&scratch[0], &data[0], sizeof(uint32_t)) == 0);
 126         zero(scratch);
 127         unaligned_write_le32(&scratch[1], 0x04030201);
 128         assert_se(memcmp(&scratch[1], &data[1], sizeof(uint32_t)) == 0);
 129         zero(scratch);
 130         unaligned_write_le32(&scratch[2], 0x05040302);
 131         assert_se(memcmp(&scratch[2], &data[2], sizeof(uint32_t)) == 0);
 132         zero(scratch);
 133         unaligned_write_le32(&scratch[3], 0x06050403);
 134         assert_se(memcmp(&scratch[3], &data[3], sizeof(uint32_t)) == 0);
 135
 136         zero(scratch);
 137         unaligned_write_le64(&scratch[0], 0x0706050403020100);
 138         assert_se(memcmp(&scratch[0], &data[0], sizeof(uint64_t)) == 0);
 139         zero(scratch);
 140         unaligned_write_le64(&scratch[1], 0x0807060504030201);
 141         assert_se(memcmp(&scratch[1], &data[1], sizeof(uint64_t)) == 0);
 142         zero(scratch);
 143         unaligned_write_le64(&scratch[2], 0x0908070605040302);
 144         assert_se(memcmp(&scratch[2], &data[2], sizeof(uint64_t)) == 0);
 145         zero(scratch);
 146         unaligned_write_le64(&scratch[3], 0x0a09080706050403);
 147         assert_se(memcmp(&scratch[3], &data[3], sizeof(uint64_t)) == 0);
 148         zero(scratch);
 149         unaligned_write_le64(&scratch[4], 0x0B0A090807060504);
 150         assert_se(memcmp(&scratch[4], &data[4], sizeof(uint64_t)) == 0);
 151         zero(scratch);
 152         unaligned_write_le64(&scratch[5], 0x0c0b0a0908070605);
 153         assert_se(memcmp(&scratch[5], &data[5], sizeof(uint64_t)) == 0);
 154         zero(scratch);
 155         unaligned_write_le64(&scratch[6], 0x0d0c0b0a09080706);
 156         assert_se(memcmp(&scratch[6], &data[6], sizeof(uint64_t)) == 0);
 157         zero(scratch);
 158         unaligned_write_le64(&scratch[7], 0x0e0d0c0b0a090807);
 159         assert_se(memcmp(&scratch[7], &data[7], sizeof(uint64_t)) == 0);
 160 }
 161
 162 static void test_ne(void) {
 163         uint16_t x = 4711;
 164         uint32_t y = 123456;
 165         uint64_t z = 9876543210;
 166
 167         /* Note that we don't bother actually testing alignment issues in this function, after all the _ne() functions
 168          * are just aliases for the _le() or _be() implementations, which we test extensively above. Hence, in this
 169          * function, just ensure that they map to the right version on the local architecture. */
 170
 171         assert_se(unaligned_read_ne16(&x) == 4711);
 172         assert_se(unaligned_read_ne32(&y) == 123456);
 173         assert_se(unaligned_read_ne64(&z) == 9876543210);
 174
 175         unaligned_write_ne16(&x, 1);
 176         unaligned_write_ne32(&y, 2);
 177         unaligned_write_ne64(&z, 3);
 178
 179         assert_se(x == 1);
 180         assert_se(y == 2);
 181         assert_se(z == 3);
 182 }
 183
 184 int main(int argc, const char *argv[]) {
 185         test_be();
 186         test_le();
 187         test_ne();
 188         return 0;
 189 }