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util: add virendian.h macros

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We have several cases where we need to read endian-dependent
data regardless of host endianness; rather than open-coding
these call sites, it will be nicer to funnel things through
a macro.

The virendian.h file can be expanded to add writer functions,
and/or 16-bit access patterns, if needed.  Also, if we need
to turn things into a function to avoid multiple evaluations
of buf, that can be done later.  But for now, a macro worked.

* src/util/virendian.h: New file.
* src/Makefile.am (UTIL_SOURCES): Ship it.
* tests/virendiantest.c: New test.
* tests/Makefile.am (test_programs, virendiantest_SOURCES): Run
the test.
* .gitignore: Ignore built file.
This commit is contained in:
Eric Blake
2013-02-08 16:44:21 -07:00
parent d1c7b00b60
commit c6f1060ca7
5 changed files with 203 additions and 2 deletions
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102
tests/virendiantest.c Normal file
View File

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/*
* Copyright (C) 2013 Red Hat, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library. If not, see
* <http://www.gnu.org/licenses/>.
*
*/
#include <config.h>
#include "testutils.h"
#include "virendian.h"
static int
test1(const void *data ATTRIBUTE_UNUSED)
{
/* Regular char should work, even if signed, and even with
* unaligned access. */
char array[] = { 1, 2, 3, 4, 5, 6, 7, 8,
0x89, 0x8a, 0x8b, 0x8c, 0x8d };
int ret = -1;
if (virReadBufInt64BE(array) != 0x0102030405060708ULL)
goto cleanup;
if (virReadBufInt64BE(array + 5) != 0x060708898a8b8c8dULL)
goto cleanup;
if (virReadBufInt64LE(array) != 0x0807060504030201ULL)
goto cleanup;
if (virReadBufInt64LE(array + 5) != 0x8d8c8b8a89080706ULL)
goto cleanup;
if (virReadBufInt32BE(array) != 0x01020304U)
goto cleanup;
if (virReadBufInt32BE(array + 9) != 0x8a8b8c8dU)
goto cleanup;
if (virReadBufInt32LE(array) != 0x04030201U)
goto cleanup;
if (virReadBufInt32LE(array + 9) != 0x8d8c8b8aU)
goto cleanup;
ret = 0;
cleanup:
return ret;
}
static int
test2(const void *data ATTRIBUTE_UNUSED)
{
/* Unsigned char should work without cast, even if unaligned access. */
unsigned char array[] = { 1, 2, 3, 4, 5, 6, 7, 8,
0x89, 0x8a, 0x8b, 0x8c, 0x8d };
int ret = -1;
if (virReadBufInt64BE(array) != 0x0102030405060708ULL)
goto cleanup;
if (virReadBufInt64BE(array + 5) != 0x060708898a8b8c8dULL)
goto cleanup;
if (virReadBufInt64LE(array) != 0x0807060504030201ULL)
goto cleanup;
if (virReadBufInt64LE(array + 5) != 0x8d8c8b8a89080706ULL)
goto cleanup;
if (virReadBufInt32BE(array) != 0x01020304U)
goto cleanup;
if (virReadBufInt32BE(array + 9) != 0x8a8b8c8dU)
goto cleanup;
if (virReadBufInt32LE(array) != 0x04030201U)
goto cleanup;
if (virReadBufInt32LE(array + 9) != 0x8d8c8b8aU)
goto cleanup;
ret = 0;
cleanup:
return ret;
}
static int
mymain(void)
{
int ret = 0;
if (virtTestRun("test1", 1, test1, NULL) < 0)
ret = -1;
if (virtTestRun("test2", 1, test2, NULL) < 0)
ret = -1;
return ret;
}
VIRT_TEST_MAIN(mymain)