common/include/test-byte-swapping.c

   1 /* nbdkit
   2  * Copyright Red Hat
   3  *
   4  * Redistribution and use in source and binary forms, with or without
   5  * modification, are permitted provided that the following conditions are
   6  * met:
   7  *
   8  * * Redistributions of source code must retain the above copyright
   9  * notice, this list of conditions and the following disclaimer.
  10  *
  11  * * Redistributions in binary form must reproduce the above copyright
  12  * notice, this list of conditions and the following disclaimer in the
  13  * documentation and/or other materials provided with the distribution.
  14  *
  15  * * Neither the name of Red Hat nor the names of its contributors may be
  16  * used to endorse or promote products derived from this software without
  17  * specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY RED HAT AND CONTRIBUTORS ''AS IS'' AND
  20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
  21  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
  22  * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL RED HAT OR
  23  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  24  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  25  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
  26  * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
  27  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  28  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
  29  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  30  * SUCH DAMAGE.
  31  */
  32
  33 #include <config.h>
  34
  35 #include <stdio.h>
  36 #include <stdlib.h>
  37 #include <stdint.h>
  38 #include <string.h>
  39 #undef NDEBUG /* Keep test strong even for nbdkit built without assertions */
  40 #include <assert.h>
  41
  42 #include "byte-swapping.h"
  43
  44 /* Little-endian test strings. */
  45 static uint8_t le16[] = { 0x34, 0x12 };
  46 static uint8_t le32[] = { 0x78, 0x56, 0x34, 0x12 };
  47 static uint8_t le64[] = { 0xf0, 0xde, 0xbc, 0x9a, 0x78, 0x56, 0x34, 0x12 };
  48
  49 /* Big-endian test strings. */
  50 static uint8_t be16[] = { 0x12, 0x34 };
  51 static uint8_t be32[] = { 0x12, 0x34, 0x56, 0x78 };
  52 static uint8_t be64[] = { 0x12, 0x34, 0x56, 0x78, 0x9a, 0xbc, 0xde, 0xf0 };
  53
  54 int
  55 main (void)
  56 {
  57   uint16_t i16;
  58   uint32_t i32;
  59   uint64_t i64;
  60
  61   memcpy (&i16, le16, 2);
  62   assert (le16toh (i16) == 0x1234);
  63   memcpy (&i32, le32, 4);
  64   assert (le32toh (i32) == 0x12345678);
  65   memcpy (&i64, le64, 8);
  66   assert (le64toh (i64) == 0x123456789abcdef0);
  67
  68   memcpy (&i16, be16, 2);
  69   assert (be16toh (i16) == 0x1234);
  70   memcpy (&i32, be32, 4);
  71   assert (be32toh (i32) == 0x12345678);
  72   memcpy (&i64, be64, 8);
  73   assert (be64toh (i64) == 0x123456789abcdef0);
  74
  75   i16 = htole16 (0x1234);
  76   assert (memcmp (&i16, le16, 2) == 0);
  77   i32 = htole32 (0x12345678);
  78   assert (memcmp (&i32, le32, 4) == 0);
  79   i64 = htole64 (0x123456789abcdef0);
  80   assert (memcmp (&i64, le64, 8) == 0);
  81
  82   i16 = htobe16 (0x1234);
  83   assert (memcmp (&i16, be16, 2) == 0);
  84   i32 = htobe32 (0x12345678);
  85   assert (memcmp (&i32, be32, 4) == 0);
  86   i64 = htobe64 (0x123456789abcdef0);
  87   assert (memcmp (&i64, be64, 8) == 0);
  88
  89   memcpy (&i16, le16, 2);
  90   i16 = bswap_16 (i16);
  91   assert (memcmp (&i16, be16, 2) == 0);
  92   i16 = bswap_16 (i16);
  93   assert (memcmp (&i16, le16, 2) == 0);
  94
  95   memcpy (&i32, le32, 4);
  96   i32 = bswap_32 (i32);
  97   assert (memcmp (&i32, be32, 4) == 0);
  98   i32 = bswap_32 (i32);
  99   assert (memcmp (&i32, le32, 4) == 0);
 100
 101   memcpy (&i64, le64, 8);
 102   i64 = bswap_64 (i64);
 103   assert (memcmp (&i64, be64, 8) == 0);
 104   i64 = bswap_64 (i64);
 105   assert (memcmp (&i64, le64, 8) == 0);
 106
 107   exit (EXIT_SUCCESS);
 108 }