src/test/test-unaligned.c

   1 /* SPDX-License-Identifier: LGPL-2.1+ */
   2 /***
   3   This file is part of systemd
   4
   5   Copyright 2014 Tom Gundersen
   6 ***/
   7
   8 #include "sparse-endian.h"
   9 #include "unaligned.h"
  10 #include "util.h"
  11
  12 static uint8_t data[] = {
  13         0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
  14         0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f,
  15 };
  16
  17 static void test_be(void) {
  18         uint8_t scratch[16];
  19
  20         assert_se(unaligned_read_be16(&data[0]) == 0x0001);
  21         assert_se(unaligned_read_be16(&data[1]) == 0x0102);
  22
  23         assert_se(unaligned_read_be32(&data[0]) == 0x00010203);
  24         assert_se(unaligned_read_be32(&data[1]) == 0x01020304);
  25         assert_se(unaligned_read_be32(&data[2]) == 0x02030405);
  26         assert_se(unaligned_read_be32(&data[3]) == 0x03040506);
  27
  28         assert_se(unaligned_read_be64(&data[0]) == 0x0001020304050607);
  29         assert_se(unaligned_read_be64(&data[1]) == 0x0102030405060708);
  30         assert_se(unaligned_read_be64(&data[2]) == 0x0203040506070809);
  31         assert_se(unaligned_read_be64(&data[3]) == 0x030405060708090a);
  32         assert_se(unaligned_read_be64(&data[4]) == 0x0405060708090a0b);
  33         assert_se(unaligned_read_be64(&data[5]) == 0x05060708090a0b0c);
  34         assert_se(unaligned_read_be64(&data[6]) == 0x060708090a0b0c0d);
  35         assert_se(unaligned_read_be64(&data[7]) == 0x0708090a0b0c0d0e);
  36
  37         zero(scratch);
  38         unaligned_write_be16(&scratch[0], 0x0001);
  39         assert_se(memcmp(&scratch[0], &data[0], sizeof(uint16_t)) == 0);
  40         zero(scratch);
  41         unaligned_write_be16(&scratch[1], 0x0102);
  42         assert_se(memcmp(&scratch[1], &data[1], sizeof(uint16_t)) == 0);
  43
  44         zero(scratch);
  45         unaligned_write_be32(&scratch[0], 0x00010203);
  46         assert_se(memcmp(&scratch[0], &data[0], sizeof(uint32_t)) == 0);
  47         zero(scratch);
  48         unaligned_write_be32(&scratch[1], 0x01020304);
  49         assert_se(memcmp(&scratch[1], &data[1], sizeof(uint32_t)) == 0);
  50         zero(scratch);
  51         unaligned_write_be32(&scratch[2], 0x02030405);
  52         assert_se(memcmp(&scratch[2], &data[2], sizeof(uint32_t)) == 0);
  53         zero(scratch);
  54         unaligned_write_be32(&scratch[3], 0x03040506);
  55         assert_se(memcmp(&scratch[3], &data[3], sizeof(uint32_t)) == 0);
  56
  57         zero(scratch);
  58         unaligned_write_be64(&scratch[0], 0x0001020304050607);
  59         assert_se(memcmp(&scratch[0], &data[0], sizeof(uint64_t)) == 0);
  60         zero(scratch);
  61         unaligned_write_be64(&scratch[1], 0x0102030405060708);
  62         assert_se(memcmp(&scratch[1], &data[1], sizeof(uint64_t)) == 0);
  63         zero(scratch);
  64         unaligned_write_be64(&scratch[2], 0x0203040506070809);
  65         assert_se(memcmp(&scratch[2], &data[2], sizeof(uint64_t)) == 0);
  66         zero(scratch);
  67         unaligned_write_be64(&scratch[3], 0x030405060708090a);
  68         assert_se(memcmp(&scratch[3], &data[3], sizeof(uint64_t)) == 0);
  69         zero(scratch);
  70         unaligned_write_be64(&scratch[4], 0x0405060708090a0b);
  71         assert_se(memcmp(&scratch[4], &data[4], sizeof(uint64_t)) == 0);
  72         zero(scratch);
  73         unaligned_write_be64(&scratch[5], 0x05060708090a0b0c);
  74         assert_se(memcmp(&scratch[5], &data[5], sizeof(uint64_t)) == 0);
  75         zero(scratch);
  76         unaligned_write_be64(&scratch[6], 0x060708090a0b0c0d);
  77         assert_se(memcmp(&scratch[6], &data[6], sizeof(uint64_t)) == 0);
  78         zero(scratch);
  79         unaligned_write_be64(&scratch[7], 0x0708090a0b0c0d0e);
  80         assert_se(memcmp(&scratch[7], &data[7], sizeof(uint64_t)) == 0);
  81 }
  82
  83 static void test_le(void) {
  84         uint8_t scratch[16];
  85
  86         assert_se(unaligned_read_le16(&data[0]) == 0x0100);
  87         assert_se(unaligned_read_le16(&data[1]) == 0x0201);
  88
  89         assert_se(unaligned_read_le32(&data[0]) == 0x03020100);
  90         assert_se(unaligned_read_le32(&data[1]) == 0x04030201);
  91         assert_se(unaligned_read_le32(&data[2]) == 0x05040302);
  92         assert_se(unaligned_read_le32(&data[3]) == 0x06050403);
  93
  94         assert_se(unaligned_read_le64(&data[0]) == 0x0706050403020100);
  95         assert_se(unaligned_read_le64(&data[1]) == 0x0807060504030201);
  96         assert_se(unaligned_read_le64(&data[2]) == 0x0908070605040302);
  97         assert_se(unaligned_read_le64(&data[3]) == 0x0a09080706050403);
  98         assert_se(unaligned_read_le64(&data[4]) == 0x0b0a090807060504);
  99         assert_se(unaligned_read_le64(&data[5]) == 0x0c0b0a0908070605);
 100         assert_se(unaligned_read_le64(&data[6]) == 0x0d0c0b0a09080706);
 101         assert_se(unaligned_read_le64(&data[7]) == 0x0e0d0c0b0a090807);
 102
 103         zero(scratch);
 104         unaligned_write_le16(&scratch[0], 0x0100);
 105         assert_se(memcmp(&scratch[0], &data[0], sizeof(uint16_t)) == 0);
 106         zero(scratch);
 107         unaligned_write_le16(&scratch[1], 0x0201);
 108         assert_se(memcmp(&scratch[1], &data[1], sizeof(uint16_t)) == 0);
 109
 110         zero(scratch);
 111         unaligned_write_le32(&scratch[0], 0x03020100);
 112
 113         assert_se(memcmp(&scratch[0], &data[0], sizeof(uint32_t)) == 0);
 114         zero(scratch);
 115         unaligned_write_le32(&scratch[1], 0x04030201);
 116         assert_se(memcmp(&scratch[1], &data[1], sizeof(uint32_t)) == 0);
 117         zero(scratch);
 118         unaligned_write_le32(&scratch[2], 0x05040302);
 119         assert_se(memcmp(&scratch[2], &data[2], sizeof(uint32_t)) == 0);
 120         zero(scratch);
 121         unaligned_write_le32(&scratch[3], 0x06050403);
 122         assert_se(memcmp(&scratch[3], &data[3], sizeof(uint32_t)) == 0);
 123
 124         zero(scratch);
 125         unaligned_write_le64(&scratch[0], 0x0706050403020100);
 126         assert_se(memcmp(&scratch[0], &data[0], sizeof(uint64_t)) == 0);
 127         zero(scratch);
 128         unaligned_write_le64(&scratch[1], 0x0807060504030201);
 129         assert_se(memcmp(&scratch[1], &data[1], sizeof(uint64_t)) == 0);
 130         zero(scratch);
 131         unaligned_write_le64(&scratch[2], 0x0908070605040302);
 132         assert_se(memcmp(&scratch[2], &data[2], sizeof(uint64_t)) == 0);
 133         zero(scratch);
 134         unaligned_write_le64(&scratch[3], 0x0a09080706050403);
 135         assert_se(memcmp(&scratch[3], &data[3], sizeof(uint64_t)) == 0);
 136         zero(scratch);
 137         unaligned_write_le64(&scratch[4], 0x0B0A090807060504);
 138         assert_se(memcmp(&scratch[4], &data[4], sizeof(uint64_t)) == 0);
 139         zero(scratch);
 140         unaligned_write_le64(&scratch[5], 0x0c0b0a0908070605);
 141         assert_se(memcmp(&scratch[5], &data[5], sizeof(uint64_t)) == 0);
 142         zero(scratch);
 143         unaligned_write_le64(&scratch[6], 0x0d0c0b0a09080706);
 144         assert_se(memcmp(&scratch[6], &data[6], sizeof(uint64_t)) == 0);
 145         zero(scratch);
 146         unaligned_write_le64(&scratch[7], 0x0e0d0c0b0a090807);
 147         assert_se(memcmp(&scratch[7], &data[7], sizeof(uint64_t)) == 0);
 148 }
 149
 150 static void test_ne(void) {
 151         uint16_t x = 4711;
 152         uint32_t y = 123456;
 153         uint64_t z = 9876543210;
 154
 155         /* Note that we don't bother actually testing alignment issues in this function, after all the _ne() functions
 156          * are just aliases for the _le() or _be() implementations, which we test extensively above. Hence, in this
 157          * function, just ensure that they map to the right version on the local architecture. */
 158
 159         assert_se(unaligned_read_ne16(&x) == 4711);
 160         assert_se(unaligned_read_ne32(&y) == 123456);
 161         assert_se(unaligned_read_ne64(&z) == 9876543210);
 162
 163         unaligned_write_ne16(&x, 1);
 164         unaligned_write_ne32(&y, 2);
 165         unaligned_write_ne64(&z, 3);
 166
 167         assert_se(x == 1);
 168         assert_se(y == 2);
 169         assert_se(z == 3);
 170 }
 171
 172 int main(int argc, const char *argv[]) {
 173         test_be();
 174         test_le();
 175         test_ne();
 176         return 0;
 177 }