Tests: Create test_filter_str.c.

Tests lzma_str_to_filters(), lzma_str_from_filters(), and
lzma_str_list_filters() API functions.

3 files changed, 596 insertions, 0 deletions

diff --git a/CMakeLists.txt b/CMakeLists.txt
index e5b4e5b5..cfa0dd6f 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -846,6 +846,7 @@ if(BUILD_TESTING)
         test_block_header
         test_check
         test_filter_flags
+        test_filter_str
         test_hardware
         test_index
         test_index_hash
diff --git a/tests/Makefile.am b/tests/Makefile.am
index b1a2378a..0523191d 100644
--- a/tests/Makefile.am
+++ b/tests/Makefile.am
@@ -43,6 +43,7 @@ check_PROGRAMS = \
 	test_hardware \
 	test_stream_flags \
 	test_filter_flags \
+	test_filter_str \
 	test_block_header \
 	test_index \
 	test_index_hash \
@@ -56,6 +57,7 @@ TESTS = \
 	test_hardware \
 	test_stream_flags \
 	test_filter_flags \
+	test_filter_str \
 	test_block_header \
 	test_index \
 	test_index_hash \
diff --git a/tests/test_filter_str.c b/tests/test_filter_str.c
new file mode 100644
index 00000000..15aee55a
--- /dev/null
+++ b/tests/test_filter_str.c
@@ -0,0 +1,593 @@
+///////////////////////////////////////////////////////////////////////////////
+//
+/// \file       test_filter_str.c
+/// \brief      Tests Filter string functions
+//
+//  Author:    Jia Tan
+//
+//  This file has been put into the public domain.
+//  You can do whatever you want with this file.
+//
+///////////////////////////////////////////////////////////////////////////////
+
+#include "tests.h"
+
+
+static void
+test_lzma_str_to_filters(void)
+{
+	lzma_filter filters[LZMA_FILTERS_MAX + 1];
+	int error_pos;
+
+	// Test with NULL string.
+	assert_true(lzma_str_to_filters(NULL, &error_pos, filters, 0,
+			NULL) != NULL);
+
+	// Test with NULL filter array.
+	assert_true(lzma_str_to_filters("lzma2", &error_pos, NULL, 0,
+			NULL) != NULL);
+
+	// Test with unsupported flags.
+	assert_true(lzma_str_to_filters("lzma2", &error_pos, filters,
+			UINT32_MAX, NULL) != NULL);
+
+	assert_true(lzma_str_to_filters("lzma2", &error_pos, filters,
+			LZMA_STR_NO_SPACES << 1, NULL) != NULL);
+
+	assert_true(lzma_str_to_filters("lzma2", &error_pos, filters,
+			LZMA_STR_NO_SPACES, NULL) != NULL);
+
+	// Test with empty string.
+	assert_true(lzma_str_to_filters("", &error_pos,
+			filters, 0, NULL) != NULL);
+	assert_int_eq(error_pos, 0);
+
+	// Test with invalid filter name and missing filter name.
+	assert_true(lzma_str_to_filters("lzma2 abcd", &error_pos,
+			filters, 0, NULL) != NULL);
+	assert_int_eq(error_pos, 6);
+
+	assert_true(lzma_str_to_filters("lzma2--abcd", &error_pos,
+			filters, 0, NULL) != NULL);
+	assert_int_eq(error_pos, 7);
+
+	assert_true(lzma_str_to_filters("lzma2--", &error_pos,
+			filters, 0, NULL) != NULL);
+	assert_int_eq(error_pos, 7);
+
+	// Test LZMA_STR_ALL_FILTERS flag (should work with LZMA1 if built).
+#if defined(HAVE_ENCODER_LZMA1) || defined(HAVE_DECODER_LZMA1)
+	// Using LZMA1 as a Filter should fail without LZMA_STR_ALL_FILTERS.
+	assert_true(lzma_str_to_filters("lzma1", &error_pos, filters,
+			0, NULL) != NULL);
+	assert_int_eq(error_pos, 0);
+
+	assert_true(lzma_str_to_filters("lzma1", &error_pos, filters,
+			LZMA_STR_ALL_FILTERS, NULL) == NULL);
+
+	// Verify Filters array IDs are correct. The array should contain
+	// only two elements:
+	// 1. LZMA1 Filter
+	// 2. LZMA_VLI_UNKNOWN filter array terminator
+	assert_uint_eq(filters[0].id, LZMA_FILTER_LZMA1);
+	assert_uint_eq(filters[1].id, LZMA_VLI_UNKNOWN);
+
+	lzma_filters_free(filters, NULL);
+#endif
+
+	// Test LZMA_STR_NO_VALIDATION flag. This should allow having the
+	// same Filter multiple times in the chain and having a non-last
+	// Filter like lzma2 appear before another Filter.
+	// Without the flag, "lzma2 lzma2" must fail.
+	assert_true(lzma_str_to_filters("lzma2 lzma2", &error_pos, filters,
+			0, NULL) != NULL);
+
+	assert_true(lzma_str_to_filters("lzma2 lzma2", &error_pos, filters,
+			LZMA_STR_NO_VALIDATION, NULL) == NULL);
+
+	assert_uint_eq(filters[0].id, LZMA_FILTER_LZMA2);
+	assert_uint_eq(filters[1].id, LZMA_FILTER_LZMA2);
+	assert_uint_eq(filters[2].id, LZMA_VLI_UNKNOWN);
+
+	lzma_filters_free(filters, NULL);
+
+	// Should fail with invalid Filter options (lc + lp must be <= 4).
+	assert_true(lzma_str_to_filters("lzma2:lc=3,lp=3", &error_pos, filters,
+			LZMA_STR_NO_VALIDATION, NULL) != NULL);
+
+	// Test invalid option name.
+	assert_true(lzma_str_to_filters("lzma2:foo=1,bar=2", &error_pos,
+			filters, 0, NULL) != NULL);
+	assert_int_eq(error_pos, 6);
+
+	// Test missing option value.
+	assert_true(lzma_str_to_filters("lzma2:lc=", &error_pos,
+			filters, 0, NULL) != NULL);
+	assert_int_eq(error_pos, 9);
+
+	assert_true(lzma_str_to_filters("lzma2:=,pb=1", &error_pos,
+			filters, 0, NULL) != NULL);
+	assert_int_eq(error_pos, 6);
+
+	// Test unsupported preset value.
+	assert_true(lzma_str_to_filters("-10", &error_pos,
+			filters, 0, NULL) != NULL);
+	assert_int_eq(error_pos, 2);
+
+	assert_true(lzma_str_to_filters("-5f", &error_pos,
+			filters, 0, NULL) != NULL);
+	assert_int_eq(error_pos, 2);
+
+	// Test filter chain too long.
+	assert_true(lzma_str_to_filters("lzma2 lzma2 lzma2 lzma2 lzma2",
+			&error_pos, filters, LZMA_STR_NO_VALIDATION,
+			NULL) != NULL);
+	assert_int_eq(error_pos, 24);
+
+#if defined(HAVE_ENCODER_LZMA1) || defined(HAVE_DECODER_LZMA1)
+	// Should fail with a Filter not supported in the .xz format (lzma1).
+	assert_true(lzma_str_to_filters("lzma1", &error_pos, filters,
+			LZMA_STR_NO_VALIDATION, NULL) != NULL);
+#endif
+
+	// Test setting options with the "=" format.
+	assert_true(lzma_str_to_filters("lzma2=dict=4096,lc=2,lp=2,pb=1,"
+			"mode=fast,nice=3,mf=hc3,depth=10", &error_pos,
+			filters, 0, NULL) == NULL);
+	assert_uint_eq(filters[0].id, LZMA_FILTER_LZMA2);
+	assert_uint_eq(filters[1].id, LZMA_VLI_UNKNOWN);
+
+	lzma_options_lzma *opts = filters[0].options;
+	assert_uint_eq(opts->dict_size, 4096);
+	assert_uint_eq(opts->lc, 2);
+	assert_uint_eq(opts->lp, 2);
+	assert_uint_eq(opts->pb, 1);
+	assert_uint_eq(opts->mode, LZMA_MODE_FAST);
+	assert_uint_eq(opts->nice_len, 3);
+	assert_uint_eq(opts->mf, LZMA_MF_HC3);
+	assert_uint_eq(opts->depth, 10);
+
+	lzma_filters_free(filters, NULL);
+
+#if defined(HAVE_ENCODER_X86) || defined(HAVE_DECODER_X86)
+	// Test BCJ Filter options.
+	assert_true(lzma_str_to_filters("x86:start=16", &error_pos, filters,
+			LZMA_STR_NO_VALIDATION, NULL) == NULL);
+
+	assert_uint_eq(filters[0].id, LZMA_FILTER_X86);
+	assert_uint_eq(filters[1].id, LZMA_VLI_UNKNOWN);
+
+	lzma_options_bcj *bcj_opts = filters[0].options;
+	assert_uint_eq(bcj_opts->start_offset, 16);
+
+	lzma_filters_free(filters, NULL);
+#endif
+
+#if defined(HAVE_ENCODER_DELTA) || defined(HAVE_DECODER_DELTA)
+	// Test Delta Filter options.
+	assert_true(lzma_str_to_filters("delta:dist=20", &error_pos, filters,
+			LZMA_STR_NO_VALIDATION, NULL) == NULL);
+
+	assert_uint_eq(filters[0].id, LZMA_FILTER_DELTA);
+	assert_uint_eq(filters[1].id, LZMA_VLI_UNKNOWN);
+
+	lzma_options_delta *delta_opts = filters[0].options;
+	assert_uint_eq(delta_opts->dist, 20);
+
+	lzma_filters_free(filters, NULL);
+#endif
+
+	// Test skipping leading spaces.
+	assert_true(lzma_str_to_filters("    lzma2", &error_pos, filters,
+			0, NULL) == NULL);
+
+	assert_uint_eq(filters[0].id, LZMA_FILTER_LZMA2);
+	assert_uint_eq(filters[1].id, LZMA_VLI_UNKNOWN);
+
+	lzma_filters_free(filters, NULL);
+
+	// Test skipping trailing spaces.
+	assert_true(lzma_str_to_filters("lzma2    ", &error_pos, filters,
+			0, NULL) == NULL);
+
+	assert_uint_eq(filters[0].id, LZMA_FILTER_LZMA2);
+	assert_uint_eq(filters[1].id, LZMA_VLI_UNKNOWN);
+
+	lzma_filters_free(filters, NULL);
+
+	// Test with "--" instead of space separating.
+	assert_true(lzma_str_to_filters("lzma2--lzma2", &error_pos, filters,
+			LZMA_STR_NO_VALIDATION, NULL) == NULL);
+
+	assert_uint_eq(filters[0].id, LZMA_FILTER_LZMA2);
+	assert_uint_eq(filters[1].id, LZMA_FILTER_LZMA2);
+	assert_uint_eq(filters[2].id, LZMA_VLI_UNKNOWN);
+
+	lzma_filters_free(filters, NULL);
+
+	// Test preset with and without leading "-", and with "e".
+	assert_true(lzma_str_to_filters("-3", &error_pos, filters,
+			0, NULL) == NULL);
+
+	assert_uint_eq(filters[0].id, LZMA_FILTER_LZMA2);
+	assert_uint_eq(filters[1].id, LZMA_VLI_UNKNOWN);
+
+	lzma_filters_free(filters, NULL);
+
+	assert_true(lzma_str_to_filters("4", &error_pos, filters,
+			0, NULL) == NULL);
+
+	assert_uint_eq(filters[0].id, LZMA_FILTER_LZMA2);
+	assert_uint_eq(filters[1].id, LZMA_VLI_UNKNOWN);
+
+	lzma_filters_free(filters, NULL);
+
+	assert_true(lzma_str_to_filters("9e", &error_pos, filters,
+			0, NULL) == NULL);
+
+	assert_uint_eq(filters[0].id, LZMA_FILTER_LZMA2);
+	assert_uint_eq(filters[1].id, LZMA_VLI_UNKNOWN);
+
+	lzma_filters_free(filters, NULL);
+
+	// Test using a preset as an lzma2 option.
+	assert_true(lzma_str_to_filters("lzma2:preset=9e", &error_pos, filters,
+			0, NULL) == NULL);
+
+	assert_uint_eq(filters[0].id, LZMA_FILTER_LZMA2);
+	assert_uint_eq(filters[1].id, LZMA_VLI_UNKNOWN);
+
+	lzma_filters_free(filters, NULL);
+
+	// Test setting dictionary size with invalid modifier suffix.
+	assert_true(lzma_str_to_filters("lzma2:dict=4096ZiB", &error_pos, filters,
+			0, NULL) != NULL);
+
+	assert_true(lzma_str_to_filters("lzma2:dict=4096KiBs", &error_pos, filters,
+			0, NULL) != NULL);
+
+	// Test option that cannot have multiplier modifier.
+	assert_true(lzma_str_to_filters("lzma2:pb=1k", &error_pos, filters,
+			0, NULL) != NULL);
+
+	// Test option value too large.
+	assert_true(lzma_str_to_filters("lzma2:dict=4096GiB", &error_pos, filters,
+			0, NULL) != NULL);
+
+	// Test valid uses of multiplier modifiers (k,m,g).
+	assert_true(lzma_str_to_filters("lzma2:dict=4096KiB", &error_pos, filters,
+			0, NULL) == NULL);
+
+	assert_uint_eq(filters[0].id, LZMA_FILTER_LZMA2);
+	assert_uint_eq(filters[1].id, LZMA_VLI_UNKNOWN);
+
+	opts = filters[0].options;
+	assert_uint_eq(opts->dict_size, 4096 << 10);
+
+	lzma_filters_free(filters, NULL);
+
+	assert_true(lzma_str_to_filters("lzma2:dict=40Mi", &error_pos, filters,
+			0, NULL) == NULL);
+
+	assert_uint_eq(filters[0].id, LZMA_FILTER_LZMA2);
+	assert_uint_eq(filters[1].id, LZMA_VLI_UNKNOWN);
+
+	opts = filters[0].options;
+	assert_uint_eq(opts->dict_size, 40 << 20);
+
+	lzma_filters_free(filters, NULL);
+
+	assert_true(lzma_str_to_filters("lzma2:dict=1g", &error_pos, filters,
+			0, NULL) == NULL);
+
+	assert_uint_eq(filters[0].id, LZMA_FILTER_LZMA2);
+	assert_uint_eq(filters[1].id, LZMA_VLI_UNKNOWN);
+
+	opts = filters[0].options;
+	assert_uint_eq(opts->dict_size, 1 << 30);
+
+	lzma_filters_free(filters, NULL);
+}
+
+
+static void
+test_lzma_str_from_filters(void)
+{
+	lzma_filter filters[LZMA_FILTERS_MAX];
+	filters[0].id = LZMA_VLI_UNKNOWN;
+
+	char *output_str = NULL;
+
+	// Test basic NULL inputs.
+	assert_lzma_ret(lzma_str_from_filters(NULL, filters, 0, NULL),
+			LZMA_PROG_ERROR);
+
+	assert_lzma_ret(lzma_str_from_filters(&output_str, NULL, 0, NULL),
+			LZMA_PROG_ERROR);
+
+	// Test with empty filters array.
+	assert_lzma_ret(lzma_str_from_filters(&output_str, filters, 0, NULL),
+			LZMA_OPTIONS_ERROR);
+
+	// Create a simple filter array only containing an LZMA2 Filter.
+	assert_true(lzma_str_to_filters("lzma2", NULL, filters, 0, NULL)
+			== NULL);
+
+	// Test with bad flags.
+	assert_lzma_ret(lzma_str_from_filters(&output_str, filters,
+			LZMA_STR_ALL_FILTERS, NULL), LZMA_OPTIONS_ERROR);
+
+	assert_lzma_ret(lzma_str_from_filters(&output_str, filters,
+			LZMA_STR_NO_VALIDATION, NULL), LZMA_OPTIONS_ERROR);
+
+	// Test with no flags.
+	assert_lzma_ret(lzma_str_from_filters(&output_str, filters, 0, NULL),
+			LZMA_OK);
+
+	assert_str_eq(output_str, "lzma2");
+	free(output_str);
+
+	// Test LZMA_STR_ENCODER flag.
+	// Only the the return value is checked since the actual string
+	// may change in the future (even though it is unlikely).
+	// The order of options or the inclusion of new options could
+	// cause a change in output, so we will avoid hardcoding an
+	// expected result.
+	assert_lzma_ret(lzma_str_from_filters(&output_str, filters,
+			LZMA_STR_ENCODER, NULL), LZMA_OK);
+	free(output_str);
+
+	// Test LZMA_STR_DECODER flag.
+	assert_lzma_ret(lzma_str_from_filters(&output_str, filters,
+			LZMA_STR_DECODER, NULL), LZMA_OK);
+	free(output_str);
+
+	// Test LZMA_STR_GETOPT_LONG flag.
+	assert_lzma_ret(lzma_str_from_filters(&output_str, filters,
+			LZMA_STR_GETOPT_LONG, NULL), LZMA_OK);
+	free(output_str);
+
+	// Test LZMA_STR_NO_SPACES flag.
+	assert_lzma_ret(lzma_str_from_filters(&output_str, filters,
+			LZMA_STR_NO_SPACES, NULL), LZMA_OK);
+
+	// Check to be sure there are no spaces.
+	assert_true(strchr(output_str, ' ') == NULL);
+
+	free(output_str);
+
+	lzma_filters_free(filters, NULL);
+
+#if defined(HAVE_ENCODER_X86) || defined(HAVE_DECODER_X86)
+	assert_true(lzma_str_to_filters("x86 lzma2", NULL, filters, 0, NULL)
+			== NULL);
+
+	assert_lzma_ret(lzma_str_from_filters(&output_str, filters, 0, NULL),
+			LZMA_OK);
+
+	assert_str_eq(output_str, "x86 lzma2");
+
+	free(output_str);
+
+	// Test setting BCJ option to NULL.
+	assert_false(filters[0].options == NULL);
+	free(filters[0].options);
+
+	filters[0].options = NULL;
+
+	assert_lzma_ret(lzma_str_from_filters(&output_str, filters, 0, NULL),
+			LZMA_OK);
+
+	assert_str_eq(output_str, "x86 lzma2");
+
+	lzma_filters_free(filters, NULL);
+	free(output_str);
+#endif
+
+	lzma_options_lzma opts;
+	assert_false(lzma_lzma_preset(&opts, LZMA_PRESET_DEFAULT));
+	// Test with too many Filters (array terminated after 4+ filters).
+	lzma_filter oversized_filters[LZMA_FILTERS_MAX + 2];
+
+	for (uint32_t i = 0; i < ARRAY_SIZE(oversized_filters) - 1; i++) {
+		oversized_filters[i].id = LZMA_FILTER_LZMA2;
+		oversized_filters[i].options = &opts;
+	}
+
+	oversized_filters[LZMA_FILTERS_MAX + 1].id = LZMA_VLI_UNKNOWN;
+	oversized_filters[LZMA_FILTERS_MAX + 1].options = NULL;
+
+	assert_lzma_ret(lzma_str_from_filters(&output_str, oversized_filters,
+			0, NULL), LZMA_OPTIONS_ERROR);
+
+	// Test with NULL filter options (when they cannot be NULL).
+	filters[0].id = LZMA_FILTER_LZMA2;
+	filters[0].options = NULL;
+	filters[1].id = LZMA_VLI_UNKNOWN;
+
+	assert_lzma_ret(lzma_str_from_filters(&output_str, filters,
+			LZMA_STR_ENCODER, NULL), LZMA_OPTIONS_ERROR);
+
+	// Test with bad Filter ID.
+	filters[0].id = LZMA_VLI_UNKNOWN - 1;
+	assert_lzma_ret(lzma_str_from_filters(&output_str, filters,
+			LZMA_STR_ENCODER, NULL), LZMA_OPTIONS_ERROR);
+}
+
+
+static const char supported_encoders[][9] = {
+	"lzma2",
+#ifdef HAVE_ENCODER_X86
+	"x86",
+#endif
+#ifdef HAVE_ENCODER_POWERPC
+	"powerpc",
+#endif
+#ifdef HAVE_ENCODER_IA64
+	"ia64",
+#endif
+#ifdef HAVE_ENCODER_ARM
+	"arm",
+#endif
+#ifdef HAVE_ENCODER_ARMTHUMB
+	"armthumb",
+#endif
+#ifdef HAVE_ENCODER_SPARC
+	"sparc",
+#endif
+#ifdef HAVE_ENCODER_ARM64
+	"arm64",
+#endif
+#ifdef HAVE_ENCODER_DELTA
+	"delta",
+#endif
+};
+
+static const char supported_decoders[][9] = {
+	"lzma2",
+#ifdef HAVE_DECODER_X86
+	"x86",
+#endif
+#ifdef HAVE_DECODER_POWERPC
+	"powerpc",
+#endif
+#ifdef HAVE_DECODER_IA64
+	"ia64",
+#endif
+#ifdef HAVE_DECODER_ARM
+	"arm",
+#endif
+#ifdef HAVE_DECODER_ARMTHUMB
+	"armthumb",
+#endif
+#ifdef HAVE_DECODER_SPARC
+	"sparc",
+#endif
+#ifdef HAVE_DECODER_ARM64
+	"arm64",
+#endif
+#ifdef HAVE_DECODER_DELTA
+	"delta",
+#endif
+};
+
+static const char supported_filters[][9] = {
+	"lzma2",
+#if defined(HAVE_ENCODER_X86) || defined(HAVE_DECODER_X86)
+	"x86",
+#endif
+#if defined(HAVE_ENCODER_POWERPC) || defined(HAVE_DECODER_POWERPC)
+	"powerpc",
+#endif
+#if defined(HAVE_ENCODER_IA64) || defined(HAVE_DECODER_IA64)
+	"ia64",
+#endif
+#if defined(HAVE_ENCODER_ARM) || defined(HAVE_DECODER_ARM)
+	"arm",
+#endif
+#if defined(HAVE_ENCODER_ARMTHUMB) || defined(HAVE_DECODER_ARMTHUMB)
+	"armthumb",
+#endif
+#if defined(HAVE_ENCODER_SPARC) || defined(HAVE_DECODER_SPARC)
+	"sparc",
+#endif
+#if defined(HAVE_ENCODER_ARM64) || defined(HAVE_DECODER_ARM64)
+	"arm64",
+#endif
+#if defined(HAVE_ENCODER_DELTA) || defined(HAVE_DECODER_DELTA)
+	"delta",
+#endif
+};
+
+
+static void
+test_lzma_str_list_filters(void)
+{
+	// Test with basic NULL inputs.
+	assert_lzma_ret(lzma_str_list_filters(NULL, LZMA_VLI_UNKNOWN, 0,
+			NULL), LZMA_PROG_ERROR);
+
+	char *str = NULL;
+
+	// Test with bad flags.
+	assert_lzma_ret(lzma_str_list_filters(&str, LZMA_VLI_UNKNOWN,
+			LZMA_STR_NO_VALIDATION , NULL), LZMA_OPTIONS_ERROR);
+
+	assert_lzma_ret(lzma_str_list_filters(&str, LZMA_VLI_UNKNOWN,
+			LZMA_STR_NO_SPACES, NULL), LZMA_OPTIONS_ERROR);
+
+	// Test with bad Filter ID.
+	assert_lzma_ret(lzma_str_list_filters(&str, LZMA_VLI_UNKNOWN - 1,
+			0, NULL), LZMA_OPTIONS_ERROR);
+
+	// Test LZMA_STR_ENCODER flag.
+	assert_lzma_ret(lzma_str_list_filters(&str, LZMA_VLI_UNKNOWN,
+			LZMA_STR_ENCODER, NULL), LZMA_OK);
+
+	for (uint32_t i = 0; i < ARRAY_SIZE(supported_encoders); i++)
+		assert_str_contains(str, supported_encoders[i]);
+
+	free(str);
+
+	// Test LZMA_STR_DECODER flag.
+	assert_lzma_ret(lzma_str_list_filters(&str, LZMA_VLI_UNKNOWN,
+			LZMA_STR_DECODER, NULL), LZMA_OK);
+
+	for (uint32_t i = 0; i < ARRAY_SIZE(supported_decoders); i++)
+		assert_str_contains(str, supported_decoders[i]);
+
+	free(str);
+
+	// Test LZMA_STR_GETOPT_LONG flag.
+	assert_lzma_ret(lzma_str_list_filters(&str, LZMA_VLI_UNKNOWN,
+			LZMA_STR_GETOPT_LONG, NULL), LZMA_OK);
+
+	free(str);
+
+	// Test LZMA_STR_ALL_FILTERS flag.
+	assert_lzma_ret(lzma_str_list_filters(&str, LZMA_VLI_UNKNOWN,
+			LZMA_STR_ALL_FILTERS, NULL), LZMA_OK);
+#if defined(HAVE_ENCODER_LZMA1) || defined(HAVE_DECODER_LZMA1)
+	// With the flag, the string should contain the LZMA1 Filter.
+	assert_str_contains(str, "lzma1");
+
+	free(str);
+
+	// If a non .xz filter is specified, it should still list the Filter.
+	assert_lzma_ret(lzma_str_list_filters(&str, LZMA_FILTER_LZMA1,
+			0, NULL), LZMA_OK);
+	assert_str_eq(str, "lzma1");
+#endif
+	free(str);
+
+	// Test with no flags.
+	assert_lzma_ret(lzma_str_list_filters(&str, LZMA_VLI_UNKNOWN,
+			0, NULL), LZMA_OK);
+
+	for (uint32_t i = 0; i < ARRAY_SIZE(supported_filters); i++)
+		assert_str_contains(str, supported_filters[i]);
+
+	assert_str_doesnt_contain(str, "lzma1");
+
+	free(str);
+
+	// Test providing a Filter ID.
+	assert_lzma_ret(lzma_str_list_filters(&str, LZMA_FILTER_LZMA2,
+			LZMA_STR_ALL_FILTERS, NULL), LZMA_OK);
+	assert_str_eq(str, "lzma2");
+
+	free(str);
+}
+
+
+extern int
+main(int argc, char **argv)
+{
+	tuktest_start(argc, argv);
+
+	tuktest_run(test_lzma_str_to_filters);
+	tuktest_run(test_lzma_str_from_filters);
+	tuktest_run(test_lzma_str_list_filters);
+
+	return tuktest_end();
+}