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/* align.c -- test alignment (important for 16-bit systems)
This file is part of the LZO real-time data compression library.
Copyright (C) 1996-2017 Markus Franz Xaver Johannes Oberhumer
All Rights Reserved.
The LZO library is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License as
published by the Free Software Foundation; either version 2 of
the License, or (at your option) any later version.
The LZO 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with the LZO library; see the file COPYING.
If not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
Markus F.X.J. Oberhumer
<markus@oberhumer.com>
http://www.oberhumer.com/opensource/lzo/
*/
#if 0
#include "src/lzo_conf.h"
#include "src/lzo_ptr.h"
#endif
#include <lzo/lzoconf.h>
/* utility layer */
#define WANT_LZO_MALLOC 1
#include "examples/portab.h"
static int opt_verbose = 0;
/*************************************************************************
//
**************************************************************************/
static unsigned long align_test(lzo_bytep block, lzo_uint len, lzo_uint step)
{
lzo_bytep b1 = block;
lzo_bytep b2 = block;
lzo_bytep k1 = NULL;
lzo_bytep k2 = NULL;
lzo_bytep k;
lzo_bytep x;
lzo_uint offset = 0;
unsigned long i = 0;
assert(step > 0);
assert(step <= 65536ul);
assert((step & (step - 1)) == 0);
for (offset = step; offset < len; offset += step)
{
k1 = LZO_PTR_ALIGN_UP(b1 + 1, step);
k2 = b2 + offset;
if (k1 != k2)
{
printf("error 1: i %lu step %ld offset %ld: "
"%p (%ld) %p (%ld)\n",
i, (long) step, (long) offset,
k1, (long) (k1 - block),
k2, (long) (k2 - block));
return 0;
}
if (k1 - step != b1)
{
printf("error 2: i %lu step %ld offset %ld: "
"%p (%ld) %p (%ld)\n",
i, (long) step, (long) offset,
b1, (long) (b1 - block),
k1, (long) (k1 - block));
return 0;
}
assert(k1 > b1);
assert(k2 > b2);
assert((lzo_uint)(k2 - b2) == offset);
assert(k1 - offset == b2);
#if defined(PTR_ALIGNED_4)
if (step == 4)
{
assert(PTR_ALIGNED_4(k1));
assert(PTR_ALIGNED_4(k2));
assert(PTR_ALIGNED2_4(k1,k2));
}
#endif
#if defined(PTR_ALIGNED_8)
if (step == 8)
{
assert(PTR_ALIGNED_8(k1));
assert(PTR_ALIGNED_8(k2));
assert(PTR_ALIGNED2_8(k1,k2));
}
#endif
#if defined(PTR_LINEAR)
assert((PTR_LINEAR(k1) & (step-1)) == 0);
assert((PTR_LINEAR(k2) & (step-1)) == 0);
#endif
for (k = b1 + 1; k <= k1; k++)
{
x = LZO_PTR_ALIGN_UP(k, step);
if (x != k1)
{
printf("error 3: base: %p %p %p i %lu step %ld offset %ld: "
"%p (%ld) %p (%ld) %p (%ld)\n",
block, b1, b2,
i, (long) step, (long) offset,
k1, (long) (k1 - block),
k, (long) (k - block),
x, (long) (x - block));
return 0;
}
}
b1 = k1;
i++;
}
return i;
}
/*************************************************************************
//
**************************************************************************/
#define BLOCK_SIZE (128*1024ul)
int main(int argc, char *argv[])
{
lzo_bytep buf;
lzo_uint step;
if (argc >= 2 && strcmp(argv[1],"-v") == 0)
opt_verbose = 1;
if (lzo_init() != LZO_E_OK)
{
printf("lzo_init() failed !!!\n");
return 3;
}
buf = (lzo_bytep) lzo_malloc(2*BLOCK_SIZE + 256);
if (buf == NULL)
{
printf("out of memory\n");
return 2;
}
#if defined(lzo_uintptr_t)
printf("Align init: %p ( 0x%lx )\n", buf, (unsigned long) (lzo_uintptr_t) buf);
#elif defined(__LZO_MMODEL_HUGE)
printf("Align init: %p ( 0x%lx )\n", buf, (unsigned long) buf);
#else
printf("Align init: %p ( 0x%lx )\n", buf, (unsigned long) (size_t) buf);
#endif
for (step = 1; step <= 65536ul; step *= 2)
{
lzo_bytep block = buf;
unsigned long n;
unsigned gap;
gap = __lzo_align_gap(block, step);
block = LZO_PTR_ALIGN_UP(block, step);
if (opt_verbose >= 1)
printf("STEP %5lu: GAP: %5lu %p %p %5lu\n",
(unsigned long) step, (unsigned long) gap, buf, block,
(unsigned long) (block - buf));
n = align_test(block, BLOCK_SIZE, step);
if (n == 0)
return 1;
if ((n + 1) * step != BLOCK_SIZE)
{
printf("error 4: %ld %lu\n", (long)step, n);
return 1;
}
}
lzo_free(buf);
printf("Alignment test passed.\n");
return 0;
}
/* vim:set ts=4 sw=4 et: */
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