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-rw-r--r--unpack/unsquashfs.c65
1 files changed, 65 insertions, 0 deletions
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;
+}