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/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
/***
This file is part of systemd
Copyright 2014 Zbigniew Jędrzejewski-Szmek
systemd 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.
systemd 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 systemd; If not, see <http://www.gnu.org/licenses/>.
***/
#include "compress.h"
#include "util.h"
#include "macro.h"
#include "random-util.h"
typedef int (compress_t)(const void *src, uint64_t src_size, void *dst, size_t *dst_size);
typedef int (decompress_t)(const void *src, uint64_t src_size,
void **dst, size_t *dst_alloc_size, size_t* dst_size, size_t dst_max);
static usec_t arg_duration = 2 * USEC_PER_SEC;
static size_t arg_start;
#define MAX_SIZE (1024*1024LU)
#define PRIME 1048571 /* A prime close enough to one megabyte that mod 4 == 3 */
static size_t _permute(size_t x) {
size_t residue;
if (x >= PRIME)
return x;
residue = x*x % PRIME;
if (x <= PRIME / 2)
return residue;
else
return PRIME - residue;
}
static size_t permute(size_t x) {
return _permute((_permute(x) + arg_start) % MAX_SIZE ^ 0xFF345);
}
static char* make_buf(size_t count, const char *type) {
char *buf;
size_t i;
buf = malloc(count);
assert_se(buf);
if (streq(type, "zeros"))
memzero(buf, count);
else if (streq(type, "simple"))
for (i = 0; i < count; i++)
buf[i] = 'a' + i % ('z' - 'a' + 1);
else if (streq(type, "random")) {
size_t step = count / 10;
random_bytes(buf, step);
memzero(buf + 1*step, step);
random_bytes(buf + 2*step, step);
memzero(buf + 3*step, step);
random_bytes(buf + 4*step, step);
memzero(buf + 5*step, step);
random_bytes(buf + 6*step, step);
memzero(buf + 7*step, step);
random_bytes(buf + 8*step, step);
memzero(buf + 9*step, step);
} else
assert_not_reached("here");
return buf;
}
static void test_compress_decompress(const char* label, const char* type,
compress_t compress, decompress_t decompress) {
usec_t n, n2 = 0;
float dt;
_cleanup_free_ char *text, *buf;
_cleanup_free_ void *buf2 = NULL;
size_t buf2_allocated = 0;
size_t skipped = 0, compressed = 0, total = 0;
text = make_buf(MAX_SIZE, type);
buf = calloc(MAX_SIZE + 1, 1);
assert_se(text && buf);
n = now(CLOCK_MONOTONIC);
for (size_t i = 0; i <= MAX_SIZE; i++) {
size_t j = 0, k = 0, size;
int r;
size = permute(i);
log_debug("%s %zu %zu", type, i, size);
memzero(buf, MIN(size + 1000, MAX_SIZE));
r = compress(text, size, buf, &j);
/* assume compression must be successful except for small inputs */
assert_se(r == 0 || (size < 2048 && r == -ENOBUFS) || streq(type, "random"));
/* check for overwrites */
assert_se(buf[size] == 0);
if (r != 0) {
skipped += size;
continue;
}
assert_se(j > 0);
if (j >= size)
log_error("%s \"compressed\" %zu -> %zu", label, size, j);
r = decompress(buf, j, &buf2, &buf2_allocated, &k, 0);
assert_se(r == 0);
assert_se(buf2_allocated >= k);
assert_se(k == size);
assert_se(memcmp(text, buf2, size) == 0);
total += size;
compressed += j;
n2 = now(CLOCK_MONOTONIC);
if (n2 - n > arg_duration)
break;
}
dt = (n2-n) / 1e6;
log_info("%s/%s: compressed & decompressed %zu bytes in %.2fs (%.2fMiB/s), "
"mean compresion %.2f%%, skipped %zu bytes",
label, type, total, dt,
total / 1024. / 1024 / dt,
100 - compressed * 100. / total,
skipped);
}
int main(int argc, char *argv[]) {
const char *i;
log_set_max_level(LOG_INFO);
if (argc >= 2) {
unsigned x;
assert_se(safe_atou(argv[1], &x) >= 0);
arg_duration = x * USEC_PER_SEC;
}
if (argc == 3)
(void) safe_atolu(argv[2], &arg_start);
else
arg_start = getpid();
NULSTR_FOREACH(i, "zeros\0simple\0random\0") {
#ifdef HAVE_XZ
test_compress_decompress("XZ", i, compress_blob_xz, decompress_blob_xz);
#endif
#ifdef HAVE_LZ4
test_compress_decompress("LZ4", i, compress_blob_lz4, decompress_blob_lz4);
#endif
}
return 0;
}
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