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test-compress: replace writing zeros with ftruncate() + lseek()

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This commit is contained in:
Yu Watanabe
2026-08-27 04:34:34 +09:00
parent dd997b4fb8
commit fb1160c588
1 changed files with 7 additions and 8 deletions
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src/test/test-compress.c
+7 -8
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@@ -508,20 +508,19 @@ TEST(decompress_stream_sparse) {
zp_compressed[] = "/tmp/systemd-test.sparse-zero-compressed.XXXXXX",
zp_decompressed[] = "/tmp/systemd-test.sparse-zero-decompressed.XXXXXX";
struct stat zst;
uint64_t zsize;
uint8_t zeros[65536] = {};
uint64_t zsize, zsize_expected = 65536;
ASSERT_OK(zsrc = mkostemp_safe(zp_src));
ASSERT_OK(loop_write(zsrc, zeros, sizeof(zeros)));
ASSERT_OK_ERRNO(ftruncate(zsrc, zsize_expected));
ASSERT_EQ(lseek(zsrc, 0, SEEK_SET), (off_t) 0);
ASSERT_OK(zcompressed = mkostemp_safe(zp_compressed));
ASSERT_OK(compress_stream(c, zsrc, zcompressed, -1, &zsize));
ASSERT_EQ(zsize, (uint64_t) sizeof(zeros));
ASSERT_EQ(zsize, zsize_expected);
ASSERT_OK(zdecompressed = mkostemp_safe(zp_decompressed));
ASSERT_EQ(lseek(zcompressed, 0, SEEK_SET), (off_t) 0);
ASSERT_OK_ZERO(decompress_stream(c, zcompressed, zdecompressed, sizeof(zeros)));
ASSERT_OK_ZERO(decompress_stream(c, zcompressed, zdecompressed, zsize_expected));
compare_fd(zsrc, zdecompressed);
@@ -544,17 +543,17 @@ TEST(decompress_stream_sparse) {
dp_compressed[] = "/tmp/systemd-test.sparse-end-compressed.XXXXXX",
dp_decompressed[] = "/tmp/systemd-test.sparse-end-decompressed.XXXXXX";
uint64_t dsize;
uint8_t zeros[65536] = {};
/* 64K zeros followed by 4K random data */
ASSERT_OK(dsrc = mkostemp_safe(dp_src));
ASSERT_OK(loop_write(dsrc, zeros, sizeof(zeros)));
ASSERT_OK_ERRNO(ftruncate(dsrc, 65536));
ASSERT_OK_ERRNO(lseek(dsrc, 65536, SEEK_SET));
ASSERT_OK(loop_write(dsrc, data_block, sizeof(data_block)));
ASSERT_EQ(lseek(dsrc, 0, SEEK_SET), (off_t) 0);
ASSERT_OK(dcompressed = mkostemp_safe(dp_compressed));
ASSERT_OK(compress_stream(c, dsrc, dcompressed, -1, &dsize));
ASSERT_EQ(dsize, (uint64_t)(sizeof(zeros) + sizeof(data_block)));
ASSERT_EQ(dsize, (uint64_t) (65536 + sizeof(data_block)));
ASSERT_OK(ddecompressed = mkostemp_safe(dp_decompressed));
ASSERT_EQ(lseek(dcompressed, 0, SEEK_SET), (off_t) 0);