Add unsquashfs stub

Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>

2 files changed, 77 insertions, 0 deletions

diff --git a/unpack/Makemodule.am b/unpack/Makemodule.am
new file mode 100644
index 0000000..190803e
--- /dev/null
+++ b/unpack/Makemodule.am
@@ -0,0 +1,12 @@
+unsquashfs_SOURCES = unpack/unsquashfs.c
+unsquashfs_LDADD = libsquashfs.a libfstree.a libcompress.a libutil.a
+
+if WITH_LZMA
+unsquashfs_LDADD += $(XZ_LIBS)
+endif
+
+if WITH_ZLIB
+unsquashfs_LDADD += $(ZLIB_LIBS)
+endif
+
+bin_PROGRAMS += unsquashfs
diff --git a/unpack/unsquashfs.c b/unpack/unsquashfs.c
new file mode 100644
index 0000000..4606366
--- /dev/null
+++ b/unpack/unsquashfs.c
@@ -0,0 +1,65 @@
+/* SPDX-License-Identifier: GPL-3.0-or-later */
+#include "squashfs.h"
+#include "compress.h"
+
+#include <stdlib.h>
+#include <unistd.h>
+#include <stdio.h>
+#include <fcntl.h>
+
+extern const char *__progname;
+
+int main(int argc, char **argv)
+{
+	int fd, status = EXIT_FAILURE;
+	sqfs_super_t super;
+	compressor_t *cmp;
+
+	if (argc != 2) {
+		fprintf(stderr, "Usage: %s <filename>\n", __progname);
+		return EXIT_FAILURE;
+	}
+
+	fd = open(argv[1], O_RDONLY);
+	if (fd < 0) {
+		perror(argv[1]);
+		return EXIT_FAILURE;
+	}
+
+	if (sqfs_super_read(&super, fd))
+		goto out;
+
+	if ((super.version_major != SQFS_VERSION_MAJOR) ||
+	    (super.version_minor != SQFS_VERSION_MINOR)) {
+		fprintf(stderr,
+			"The image uses squashfs version %d.%d\n"
+			"We currently only supports version %d.%d (sorry).\n",
+			super.version_major, super.version_minor,
+			SQFS_VERSION_MAJOR, SQFS_VERSION_MINOR);
+		goto out;
+	}
+
+	if (super.flags & SQFS_FLAG_COMPRESSOR_OPTIONS) {
+		fputs("Image has been built with compressor options.\n"
+		      "This is not yet supported.\n",
+		      stderr);
+		goto out;
+	}
+
+	if (!compressor_exists(super.compression_id)) {
+		fputs("Image uses a compressor that has not been built in\n",
+		      stderr);
+		goto out;
+	}
+
+	cmp = compressor_create(super.compression_id, false, super.block_size);
+	if (cmp == NULL)
+		goto out;
+
+	status = EXIT_SUCCESS;
+
+	cmp->destroy(cmp);
+out:
+	close(fd);
+	return status;
+}