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/***
This file is part of systemd
Copyright 2014 Ronny Chevalier
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"
#ifdef HAVE_XZ
# define XZ_OK 0
#else
# define XZ_OK -EPROTONOSUPPORT
#endif
#ifdef HAVE_LZ4
# define LZ4_OK 0
#else
# define LZ4_OK -EPROTONOSUPPORT
#endif
typedef int (compress_blob_t)(const void *src, uint64_t src_size,
void *dst, size_t *dst_size);
typedef int (decompress_blob_t)(const void *src, uint64_t src_size,
void **dst, size_t *dst_alloc_size,
size_t* dst_size, size_t dst_max);
typedef int (decompress_sw_t)(const void *src, uint64_t src_size,
void **buffer, size_t *buffer_size,
const void *prefix, size_t prefix_len,
uint8_t extra);
typedef int (compress_stream_t)(int fdf, int fdt, off_t max_bytes);
typedef int (decompress_stream_t)(int fdf, int fdt, off_t max_size);
static void test_compress_decompress(int compression,
compress_blob_t compress,
decompress_blob_t decompress,
const char *data,
size_t data_len,
bool may_fail) {
char compressed[512];
size_t csize = 512;
size_t usize = 0;
_cleanup_free_ char *decompressed = NULL;
int r;
log_info("/* testing %s %s blob compression/decompression */",
object_compressed_to_string(compression), data);
r = compress(data, data_len, compressed, &csize);
if (r == -ENOBUFS) {
log_info_errno(r, "compression failed: %m");
assert(may_fail);
} else {
assert(r == 0);
r = decompress(compressed, csize,
(void **) &decompressed, &usize, &csize, 0);
assert(r == 0);
assert_se(decompressed);
assert_se(memcmp(decompressed, data, data_len) == 0);
}
r = decompress("garbage", 7,
(void **) &decompressed, &usize, &csize, 0);
assert(r < 0);
/* make sure to have the minimal lz4 compressed size */
r = decompress("00000000\1g", 9,
(void **) &decompressed, &usize, &csize, 0);
assert(r < 0);
r = decompress("\100000000g", 9,
(void **) &decompressed, &usize, &csize, 0);
assert(r < 0);
memzero(decompressed, usize);
}
static void test_decompress_startswith(int compression,
compress_blob_t compress,
decompress_sw_t decompress_sw,
const char *data,
size_t data_len,
bool may_fail) {
char compressed[512];
size_t csize = 512;
size_t usize = 0;
_cleanup_free_ char *decompressed = NULL;
int r;
log_info("/* testing decompress_startswith with %s on %s text*/",
object_compressed_to_string(compression), data);
r = compress(data, data_len, compressed, &csize);
if (r == -ENOBUFS) {
log_info_errno(r, "compression failed: %m");
assert(may_fail);
return;
}
assert(r == 0);
assert_se(decompress_sw(compressed,
csize,
(void **) &decompressed,
&usize,
data, strlen(data), '\0') > 0);
assert_se(decompress_sw(compressed,
csize,
(void **) &decompressed,
&usize,
data, strlen(data), 'w') == 0);
assert_se(decompress_sw(compressed,
csize,
(void **) &decompressed,
&usize,
"barbarbar", 9, ' ') == 0);
assert_se(decompress_sw(compressed,
csize,
(void **) &decompressed,
&usize,
data, strlen(data), '\0') > 0);
}
static void test_compress_stream(int compression,
const char* cat,
compress_stream_t compress,
decompress_stream_t decompress,
const char *srcfile) {
_cleanup_close_ int src = -1, dst = -1, dst2 = -1;
char pattern[] = "/tmp/systemd-test.xz.XXXXXX",
pattern2[] = "/tmp/systemd-test.xz.XXXXXX";
int r;
_cleanup_free_ char *cmd = NULL, *cmd2;
struct stat st = {};
log_debug("/* testing %s compression */",
object_compressed_to_string(compression));
log_debug("/* create source from %s */", srcfile);
assert_se((src = open(srcfile, O_RDONLY|O_CLOEXEC)) >= 0);
log_debug("/* test compression */");
assert_se((dst = mkostemp_safe(pattern, O_RDWR|O_CLOEXEC)) >= 0);
assert_se(compress(src, dst, -1) == 0);
if (cat) {
assert_se(asprintf(&cmd, "%s %s | diff %s -", cat, pattern, srcfile) > 0);
assert_se(system(cmd) == 0);
}
log_debug("/* test decompression */");
assert_se((dst2 = mkostemp_safe(pattern2, O_RDWR|O_CLOEXEC)) >= 0);
assert_se(stat(srcfile, &st) == 0);
assert_se(lseek(dst, 0, SEEK_SET) == 0);
r = decompress(dst, dst2, st.st_size);
assert(r == 0);
assert_se(asprintf(&cmd2, "diff %s %s", srcfile, pattern2) > 0);
assert_se(system(cmd2) == 0);
log_debug("/* test faulty decompression */");
assert_se(lseek(dst, 1, SEEK_SET) == 1);
r = decompress(dst, dst2, st.st_size);
assert(r == -EBADMSG);
assert_se(lseek(dst, 0, SEEK_SET) == 0);
assert_se(lseek(dst2, 0, SEEK_SET) == 0);
r = decompress(dst, dst2, st.st_size - 1);
assert(r == -EFBIG);
assert_se(unlink(pattern) == 0);
assert_se(unlink(pattern2) == 0);
}
int main(int argc, char *argv[]) {
const char text[] =
"text\0foofoofoofoo AAAA aaaaaaaaa ghost busters barbarbar FFF"
"foofoofoofoo AAAA aaaaaaaaa ghost busters barbarbar FFF";
char data[512] = "random\0";
log_set_max_level(LOG_DEBUG);
random_bytes(data + 7, sizeof(data) - 7);
#ifdef HAVE_XZ
test_compress_decompress(OBJECT_COMPRESSED_XZ, compress_blob_xz, decompress_blob_xz,
text, sizeof(text), false);
test_compress_decompress(OBJECT_COMPRESSED_XZ, compress_blob_xz, decompress_blob_xz,
data, sizeof(data), true);
test_decompress_startswith(OBJECT_COMPRESSED_XZ,
compress_blob_xz, decompress_startswith_xz,
text, sizeof(text), false);
test_decompress_startswith(OBJECT_COMPRESSED_XZ,
compress_blob_xz, decompress_startswith_xz,
data, sizeof(data), true);
test_compress_stream(OBJECT_COMPRESSED_XZ, "xzcat",
compress_stream_xz, decompress_stream_xz, argv[0]);
#else
log_info("/* XZ test skipped */");
#endif
#ifdef HAVE_LZ4
test_compress_decompress(OBJECT_COMPRESSED_LZ4, compress_blob_lz4, decompress_blob_lz4,
text, sizeof(text), false);
test_compress_decompress(OBJECT_COMPRESSED_LZ4, compress_blob_lz4, decompress_blob_lz4,
data, sizeof(data), true);
test_decompress_startswith(OBJECT_COMPRESSED_LZ4,
compress_blob_lz4, decompress_startswith_lz4,
text, sizeof(text), false);
test_decompress_startswith(OBJECT_COMPRESSED_LZ4,
compress_blob_lz4, decompress_startswith_lz4,
data, sizeof(data), true);
/* Produced stream is not compatible with lz4 binary, skip lz4cat check. */
test_compress_stream(OBJECT_COMPRESSED_LZ4, NULL,
compress_stream_lz4, decompress_stream_lz4, argv[0]);
#else
log_info("/* LZ4 test skipped */");
#endif
return 0;
}
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