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-rw-r--r--src/test/test-compress.c373
1 files changed, 373 insertions, 0 deletions
diff --git a/src/test/test-compress.c b/src/test/test-compress.c
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--- /dev/null
+++ b/src/test/test-compress.c
@@ -0,0 +1,373 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+
+#include <sys/stat.h>
+
+#if HAVE_LZ4
+#include <lz4.h>
+#endif
+
+#include "alloc-util.h"
+#include "compress.h"
+#include "fd-util.h"
+#include "fs-util.h"
+#include "macro.h"
+#include "memory-util.h"
+#include "path-util.h"
+#include "random-util.h"
+#include "tests.h"
+#include "tmpfile-util.h"
+
+#if HAVE_XZ
+# define XZ_OK 0
+#else
+# define XZ_OK -EPROTONOSUPPORT
+#endif
+
+#if HAVE_LZ4
+# define LZ4_OK 0
+#else
+# define LZ4_OK -EPROTONOSUPPORT
+#endif
+
+#define HUGE_SIZE (4096*1024)
+
+typedef int (compress_blob_t)(const void *src, uint64_t src_size,
+ void *dst, size_t dst_alloc_size, size_t *dst_size);
+typedef int (decompress_blob_t)(const void *src, uint64_t src_size,
+ void **dst,
+ size_t* dst_size, size_t dst_max);
+typedef int (decompress_sw_t)(const void *src, uint64_t src_size,
+ void **buffer,
+ const void *prefix, size_t prefix_len,
+ uint8_t extra);
+
+typedef int (compress_stream_t)(int fdf, int fdt, uint64_t max_bytes, uint64_t *uncompressed_size);
+typedef int (decompress_stream_t)(int fdf, int fdt, uint64_t max_size);
+
+#if HAVE_COMPRESSION
+_unused_ static void test_compress_decompress(
+ const char *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;
+ _cleanup_free_ char *decompressed = NULL;
+ int r;
+
+ log_info("/* testing %s %s blob compression/decompression */",
+ compression, data);
+
+ r = compress(data, data_len, compressed, sizeof(compressed), &csize);
+ if (r == -ENOBUFS) {
+ log_info_errno(r, "compression failed: %m");
+ assert_se(may_fail);
+ } else {
+ assert_se(r >= 0);
+ r = decompress(compressed, csize,
+ (void **) &decompressed, &csize, 0);
+ assert_se(r == 0);
+ assert_se(decompressed);
+ assert_se(memcmp(decompressed, data, data_len) == 0);
+ }
+
+ r = decompress("garbage", 7,
+ (void **) &decompressed, &csize, 0);
+ assert_se(r < 0);
+
+ /* make sure to have the minimal lz4 compressed size */
+ r = decompress("00000000\1g", 9,
+ (void **) &decompressed, &csize, 0);
+ assert_se(r < 0);
+
+ r = decompress("\100000000g", 9,
+ (void **) &decompressed, &csize, 0);
+ assert_se(r < 0);
+
+ explicit_bzero_safe(decompressed, MALLOC_SIZEOF_SAFE(decompressed));
+}
+
+_unused_ static void test_decompress_startswith(const char *compression,
+ compress_blob_t compress,
+ decompress_sw_t decompress_sw,
+ const char *data,
+ size_t data_len,
+ bool may_fail) {
+
+ char *compressed;
+ _cleanup_free_ char *compressed1 = NULL, *compressed2 = NULL, *decompressed = NULL;
+ size_t csize, len;
+ int r;
+
+ log_info("/* testing decompress_startswith with %s on %.20s text */",
+ compression, data);
+
+#define BUFSIZE_1 512
+#define BUFSIZE_2 20000
+
+ compressed = compressed1 = malloc(BUFSIZE_1);
+ assert_se(compressed1);
+ r = compress(data, data_len, compressed, BUFSIZE_1, &csize);
+ if (r == -ENOBUFS) {
+ log_info_errno(r, "compression failed: %m");
+ assert_se(may_fail);
+
+ compressed = compressed2 = malloc(BUFSIZE_2);
+ assert_se(compressed2);
+ r = compress(data, data_len, compressed, BUFSIZE_2, &csize);
+ }
+ assert_se(r >= 0);
+
+ len = strlen(data);
+
+ r = decompress_sw(compressed, csize, (void **) &decompressed, data, len, '\0');
+ assert_se(r > 0);
+ r = decompress_sw(compressed, csize, (void **) &decompressed, data, len, 'w');
+ assert_se(r == 0);
+ r = decompress_sw(compressed, csize, (void **) &decompressed, "barbarbar", 9, ' ');
+ assert_se(r == 0);
+ r = decompress_sw(compressed, csize, (void **) &decompressed, data, len - 1, data[len-1]);
+ assert_se(r > 0);
+ r = decompress_sw(compressed, csize, (void **) &decompressed, data, len - 1, 'w');
+ assert_se(r == 0);
+ r = decompress_sw(compressed, csize, (void **) &decompressed, data, len, '\0');
+ assert_se(r > 0);
+}
+
+_unused_ static void test_decompress_startswith_short(const char *compression,
+ compress_blob_t compress,
+ decompress_sw_t decompress_sw) {
+
+#define TEXT "HUGE=xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx"
+
+ char buf[1024];
+ size_t csize;
+ int r;
+
+ log_info("/* %s with %s */", __func__, compression);
+
+ r = compress(TEXT, sizeof TEXT, buf, sizeof buf, &csize);
+ assert_se(r >= 0);
+
+ for (size_t i = 1; i < strlen(TEXT); i++) {
+ _cleanup_free_ void *buf2 = NULL;
+
+ assert_se(buf2 = malloc(i));
+
+ assert_se(decompress_sw(buf, csize, &buf2, TEXT, i, TEXT[i]) == 1);
+ assert_se(decompress_sw(buf, csize, &buf2, TEXT, i, 'y') == 0);
+ }
+}
+
+_unused_ static void test_compress_stream(const char *compression,
+ const char *cat,
+ compress_stream_t compress,
+ decompress_stream_t decompress,
+ const char *srcfile) {
+
+ _cleanup_close_ int src = -EBADF, dst = -EBADF, dst2 = -EBADF;
+ _cleanup_(unlink_tempfilep) char
+ pattern[] = "/tmp/systemd-test.compressed.XXXXXX",
+ pattern2[] = "/tmp/systemd-test.compressed.XXXXXX";
+ int r;
+ _cleanup_free_ char *cmd = NULL, *cmd2 = NULL;
+ struct stat st = {};
+ uint64_t uncompressed_size;
+
+ r = find_executable(cat, NULL);
+ if (r < 0) {
+ log_error_errno(r, "Skipping %s, could not find %s binary: %m", __func__, cat);
+ return;
+ }
+
+ log_debug("/* testing %s compression */", 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)) >= 0);
+
+ assert_se(compress(src, dst, -1, &uncompressed_size) >= 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)) >= 0);
+
+ assert_se(stat(srcfile, &st) == 0);
+ assert_se((uint64_t)st.st_size == uncompressed_size);
+
+ assert_se(lseek(dst, 0, SEEK_SET) == 0);
+ r = decompress(dst, dst2, st.st_size);
+ assert_se(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_se(IN_SET(r, 0, -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_se(r == -EFBIG);
+}
+#endif
+
+#if HAVE_LZ4
+static void test_lz4_decompress_partial(void) {
+ char buf[20000], buf2[100];
+ size_t buf_size = sizeof(buf), compressed;
+ int r;
+ _cleanup_free_ char *huge = NULL;
+
+ log_debug("/* %s */", __func__);
+
+ assert_se(huge = malloc(HUGE_SIZE));
+ memcpy(huge, "HUGE=", STRLEN("HUGE="));
+ memset(&huge[STRLEN("HUGE=")], 'x', HUGE_SIZE - STRLEN("HUGE=") - 1);
+ huge[HUGE_SIZE - 1] = '\0';
+
+ r = LZ4_compress_default(huge, buf, HUGE_SIZE, buf_size);
+ assert_se(r >= 0);
+ compressed = r;
+ log_info("Compressed %i → %zu", HUGE_SIZE, compressed);
+
+ r = LZ4_decompress_safe(buf, huge, r, HUGE_SIZE);
+ assert_se(r >= 0);
+ log_info("Decompressed → %i", r);
+
+ r = LZ4_decompress_safe_partial(buf, huge,
+ compressed,
+ 12, HUGE_SIZE);
+ assert_se(r >= 0);
+ log_info("Decompressed partial %i/%i → %i", 12, HUGE_SIZE, r);
+
+ for (size_t size = 1; size < sizeof(buf2); size++) {
+ /* This failed in older lz4s but works in newer ones. */
+ r = LZ4_decompress_safe_partial(buf, buf2, compressed, size, size);
+ log_info("Decompressed partial %zu/%zu → %i (%s)", size, size, r,
+ r < 0 ? "bad" : "good");
+ if (r >= 0 && LZ4_versionNumber() >= 10803)
+ /* lz4 <= 1.8.2 should fail that test, let's only check for newer ones */
+ assert_se(memcmp(buf2, huge, r) == 0);
+ }
+}
+#endif
+
+int main(int argc, char *argv[]) {
+#if HAVE_COMPRESSION
+ _unused_ const char text[] =
+ "text\0foofoofoofoo AAAA aaaaaaaaa ghost busters barbarbar FFF"
+ "foofoofoofoo AAAA aaaaaaaaa ghost busters barbarbar FFF";
+
+ /* The file to test compression on can be specified as the first argument */
+ const char *srcfile = argc > 1 ? argv[1] : argv[0];
+
+ char data[512] = "random\0";
+
+ _cleanup_free_ char *huge = NULL;
+
+ assert_se(huge = malloc(HUGE_SIZE));
+ memcpy(huge, "HUGE=", STRLEN("HUGE="));
+ memset(&huge[STRLEN("HUGE=")], 'x', HUGE_SIZE - STRLEN("HUGE=") - 1);
+ huge[HUGE_SIZE - 1] = '\0';
+
+ test_setup_logging(LOG_DEBUG);
+
+ random_bytes(data + 7, sizeof(data) - 7);
+
+#if HAVE_XZ
+ test_compress_decompress("XZ", compress_blob_xz, decompress_blob_xz,
+ text, sizeof(text), false);
+ test_compress_decompress("XZ", compress_blob_xz, decompress_blob_xz,
+ data, sizeof(data), true);
+
+ test_decompress_startswith("XZ",
+ compress_blob_xz, decompress_startswith_xz,
+ text, sizeof(text), false);
+ test_decompress_startswith("XZ",
+ compress_blob_xz, decompress_startswith_xz,
+ data, sizeof(data), true);
+ test_decompress_startswith("XZ",
+ compress_blob_xz, decompress_startswith_xz,
+ huge, HUGE_SIZE, true);
+
+ test_compress_stream("XZ", "xzcat",
+ compress_stream_xz, decompress_stream_xz, srcfile);
+
+ test_decompress_startswith_short("XZ", compress_blob_xz, decompress_startswith_xz);
+
+#else
+ log_info("/* XZ test skipped */");
+#endif
+
+#if HAVE_LZ4
+ test_compress_decompress("LZ4", compress_blob_lz4, decompress_blob_lz4,
+ text, sizeof(text), false);
+ test_compress_decompress("LZ4", compress_blob_lz4, decompress_blob_lz4,
+ data, sizeof(data), true);
+
+ test_decompress_startswith("LZ4",
+ compress_blob_lz4, decompress_startswith_lz4,
+ text, sizeof(text), false);
+ test_decompress_startswith("LZ4",
+ compress_blob_lz4, decompress_startswith_lz4,
+ data, sizeof(data), true);
+ test_decompress_startswith("LZ4",
+ compress_blob_lz4, decompress_startswith_lz4,
+ huge, HUGE_SIZE, true);
+
+ test_compress_stream("LZ4", "lz4cat",
+ compress_stream_lz4, decompress_stream_lz4, srcfile);
+
+ test_lz4_decompress_partial();
+
+ test_decompress_startswith_short("LZ4", compress_blob_lz4, decompress_startswith_lz4);
+
+#else
+ log_info("/* LZ4 test skipped */");
+#endif
+
+#if HAVE_ZSTD
+ test_compress_decompress("ZSTD", compress_blob_zstd, decompress_blob_zstd,
+ text, sizeof(text), false);
+ test_compress_decompress("ZSTD", compress_blob_zstd, decompress_blob_zstd,
+ data, sizeof(data), true);
+
+ test_decompress_startswith("ZSTD",
+ compress_blob_zstd, decompress_startswith_zstd,
+ text, sizeof(text), false);
+ test_decompress_startswith("ZSTD",
+ compress_blob_zstd, decompress_startswith_zstd,
+ data, sizeof(data), true);
+ test_decompress_startswith("ZSTD",
+ compress_blob_zstd, decompress_startswith_zstd,
+ huge, HUGE_SIZE, true);
+
+ test_compress_stream("ZSTD", "zstdcat",
+ compress_stream_zstd, decompress_stream_zstd, srcfile);
+
+ test_decompress_startswith_short("ZSTD", compress_blob_zstd, decompress_startswith_zstd);
+#else
+ log_info("/* ZSTD test skipped */");
+#endif
+
+ return 0;
+#else
+ return log_tests_skipped("no compression algorithm supported");
+#endif
+}
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