cab: Add large LZX pre-tree test

If a pre-tree is larger than 10 bit, libarchive fails to read the data.
According to spec, up to 16 bit are valid.

Example file provided by Duncan Horn. Thanks a lot!

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

Makefile.am

@@ -490,6 +490,7 @@ libarchive_test_SOURCES= \
 	libarchive/test/test_read_format_ar.c \
 	libarchive/test/test_read_format_cab.c \
 	libarchive/test/test_read_format_cab_filename.c \
+	libarchive/test/test_read_format_cab_lzx_16bit.c \
 	libarchive/test/test_read_format_cab_lzx_e8.c \
 	libarchive/test/test_read_format_cab_lzx_oob.c \
 	libarchive/test/test_read_format_cab_mszip_oob.c \
@@ -918,6 +919,7 @@ libarchive_test_EXTRA_DIST=\
 	libarchive/test/test_read_format_cab_2.cab.uu \
 	libarchive/test/test_read_format_cab_3.cab.uu \
 	libarchive/test/test_read_format_cab_filename_cp932.cab.uu \
+	libarchive/test/test_read_format_cab_lzx_16bit.cab.uu \
 	libarchive/test/test_read_format_cab_lzx_e8.cab.uu \
 	libarchive/test/test_read_format_cab_lzx_oob.cab.uu \
 	libarchive/test/test_read_format_cab_multi.p1.cab.uu \

libarchive/test/CMakeLists.txt

@@ -119,6 +119,7 @@ IF(ENABLE_TEST)
     test_read_format_ar.c
     test_read_format_cab.c
     test_read_format_cab_filename.c
+    test_read_format_cab_lzx_16bit.c
     test_read_format_cab_lzx_e8.c
     test_read_format_cab_lzx_oob.c
     test_read_format_cab_mszip_oob.c

libarchive/test/test_read_format_cab_lzx_16bit.c

@@ -0,0 +1,52 @@
+/*-
+ * 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 "test.h"
+
+DEFINE_TEST(test_read_format_cab_lzx_16bit)
+{
+	const char *refname = "test_read_format_cab_lzx_16bit.cab";
+	struct archive *a;
+	struct archive_entry *ae;
+	char buff[16];
+
+	extract_reference_file(refname);
+
+	assert((a = archive_read_new()) != NULL);
+	assertEqualIntA(a, ARCHIVE_OK, archive_read_support_format_cab(a));
+	assertEqualIntA(a, ARCHIVE_OK, archive_read_support_filter_all(a));
+	assertEqualIntA(a, ARCHIVE_OK,
+	    archive_read_open_filename(a, refname, 10240));
+
+	/* Read entry. */
+	assertEqualIntA(a, ARCHIVE_OK, archive_read_next_header(a, &ae));
+	assertEqualString(archive_entry_pathname(ae), "lzx16.bin");
+	assertEqualInt(archive_entry_size(ae), 16);
+	assertEqualIntA(a, sizeof(buff),
+	    archive_read_data(a, buff, sizeof(buff)));
+	assertEqualMem(buff, "ABABABABABABABAB", 16);
+
+	assertEqualIntA(a, ARCHIVE_OK, archive_read_close(a));
+	assertEqualInt(ARCHIVE_OK, archive_read_free(a));
+}

libarchive/test/test_read_format_cab_lzx_16bit.cab.uu

@@ -0,0 +1,6 @@
+begin 644 test_read_format_cab_lzx_16bit.cab
+M35-#1@````""`````````"P``````````P$!``$`````````1@````$``P\0
+M````````````(0```"``;'IX,38N8FEN```````T`!```!`#`6=%JXGOS0+P
+H"R(%[??[`.@``````````'^(__\`X`````````(`_R'__ZK*`*@`````
+`
+end