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c6f1060ca7
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.
103 lines
2.8 KiB
C
103 lines
2.8 KiB
C
/*
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* Copyright (C) 2013 Red Hat, Inc.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library. If not, see
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* <http://www.gnu.org/licenses/>.
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*
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*/
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#include <config.h>
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#include "testutils.h"
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#include "virendian.h"
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static int
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test1(const void *data ATTRIBUTE_UNUSED)
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{
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/* Regular char should work, even if signed, and even with
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* unaligned access. */
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char array[] = { 1, 2, 3, 4, 5, 6, 7, 8,
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0x89, 0x8a, 0x8b, 0x8c, 0x8d };
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int ret = -1;
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if (virReadBufInt64BE(array) != 0x0102030405060708ULL)
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goto cleanup;
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if (virReadBufInt64BE(array + 5) != 0x060708898a8b8c8dULL)
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goto cleanup;
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if (virReadBufInt64LE(array) != 0x0807060504030201ULL)
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goto cleanup;
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if (virReadBufInt64LE(array + 5) != 0x8d8c8b8a89080706ULL)
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goto cleanup;
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if (virReadBufInt32BE(array) != 0x01020304U)
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goto cleanup;
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if (virReadBufInt32BE(array + 9) != 0x8a8b8c8dU)
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goto cleanup;
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if (virReadBufInt32LE(array) != 0x04030201U)
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goto cleanup;
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if (virReadBufInt32LE(array + 9) != 0x8d8c8b8aU)
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goto cleanup;
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ret = 0;
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cleanup:
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return ret;
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}
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static int
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test2(const void *data ATTRIBUTE_UNUSED)
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{
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/* Unsigned char should work without cast, even if unaligned access. */
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unsigned char array[] = { 1, 2, 3, 4, 5, 6, 7, 8,
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0x89, 0x8a, 0x8b, 0x8c, 0x8d };
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int ret = -1;
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if (virReadBufInt64BE(array) != 0x0102030405060708ULL)
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goto cleanup;
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if (virReadBufInt64BE(array + 5) != 0x060708898a8b8c8dULL)
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goto cleanup;
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if (virReadBufInt64LE(array) != 0x0807060504030201ULL)
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goto cleanup;
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if (virReadBufInt64LE(array + 5) != 0x8d8c8b8a89080706ULL)
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goto cleanup;
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if (virReadBufInt32BE(array) != 0x01020304U)
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goto cleanup;
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if (virReadBufInt32BE(array + 9) != 0x8a8b8c8dU)
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goto cleanup;
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if (virReadBufInt32LE(array) != 0x04030201U)
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goto cleanup;
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if (virReadBufInt32LE(array + 9) != 0x8d8c8b8aU)
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goto cleanup;
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ret = 0;
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cleanup:
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return ret;
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}
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static int
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mymain(void)
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{
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int ret = 0;
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if (virtTestRun("test1", 1, test1, NULL) < 0)
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ret = -1;
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if (virtTestRun("test2", 1, test2, NULL) < 0)
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ret = -1;
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return ret;
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}
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VIRT_TEST_MAIN(mymain)
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