append_filter: Verify that bidder and filter match

Make sure that appending a filter always matches its supposed bidder.

Signed-off-by: Tobias Stoeckmann <tobias@stoeckmann.org>

Makefile.am

@@ -404,6 +404,7 @@ libarchive_test_SOURCES= \
 	libarchive/test/test_archive_pathmatch_oob.c \
 	libarchive/test/test_archive_read.c \
 	libarchive/test/test_archive_read_add_passphrase.c \
+	libarchive/test/test_archive_read_append_filter.c \
 	libarchive/test/test_archive_read_close_twice.c \
 	libarchive/test/test_archive_read_multiple_data_objects.c \
 	libarchive/test/test_archive_read_next_header_empty.c \

libarchive/test/CMakeLists.txt

@@ -33,6 +33,7 @@ IF(ENABLE_TEST)
     test_archive_pathmatch_oob.c
     test_archive_read.c
     test_archive_read_add_passphrase.c
+    test_archive_read_append_filter.c
     test_archive_read_close_twice.c
     test_archive_read_multiple_data_objects.c
     test_archive_read_next_header_empty.c

libarchive/test/test_archive_read_append_filter.c

@@ -0,0 +1,54 @@
+/*-
+ * Copyright (c) 2026 Tobias Stoeckmann
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "archive.h"
+#include "test.h"
+
+DEFINE_TEST(test_archive_read_append_filter)
+{
+	struct archive *a;
+	int r;
+
+	a = archive_read_new();
+	assert(a != NULL);
+
+	/* Append a program bidder (without filter). */
+	assertEqualIntA(a, ARCHIVE_OK,
+	    archive_read_support_filter_program(a, "prog1"));
+
+	/* Append a filter program which comes with its own bidder. */
+	r = archive_read_append_filter_program(a, "prog2");
+
+	/* Verify that filter uses its own bidder. */
+	if (r == ARCHIVE_FATAL) {
+		assertEqualStringA(a, "Can't initialize filter; unable to run program \"prog2\"",
+			archive_error_string(a));
+	} else {
+		assertEqualIntA(a, ARCHIVE_OK, r);
+		assertEqualStringA(a, "Program: prog2", archive_filter_name(a, 0));
+	}
+
+	archive_read_free(a);
+}