From 3e5ccf8568f6291b827bf6308103f324d1901197 Mon Sep 17 00:00:00 2001
From: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
Date: Mon, 14 Sep 2020 15:26:28 +0200
Subject: Implement input decompression support for tar2sqfs

Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
---
 bin/tar2sqfs/Makemodule.am |  6 +++++-
 bin/tar2sqfs/tar2sqfs.c    | 45 +++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 50 insertions(+), 1 deletion(-)

diff --git a/bin/tar2sqfs/Makemodule.am b/bin/tar2sqfs/Makemodule.am
index 0a74419..58d1ef9 100644
--- a/bin/tar2sqfs/Makemodule.am
+++ b/bin/tar2sqfs/Makemodule.am
@@ -3,7 +3,11 @@ tar2sqfs_SOURCES += bin/tar2sqfs/options.c bin/tar2sqfs/process_tarball.c
 tar2sqfs_CFLAGS = $(AM_CFLAGS) $(PTHREAD_CFLAGS)
 tar2sqfs_LDADD = libcommon.a libsquashfs.la libtar.a libfstream.a
 tar2sqfs_LDADD += libfstree.a libcompat.a libfstree.a $(LZO_LIBS)
-tar2sqfs_LDADD += $(PTHREAD_LIBS)
+tar2sqfs_LDADD += $(ZLIB_LIBS) $(XZ_LIBS) $(PTHREAD_LIBS)
+
+if WITH_OWN_ZLIB
+tar2sqfs_LDADD += libz.la
+endif
 
 dist_man1_MANS += bin/tar2sqfs/tar2sqfs.1
 bin_PROGRAMS += tar2sqfs
diff --git a/bin/tar2sqfs/tar2sqfs.c b/bin/tar2sqfs/tar2sqfs.c
index 6cab231..603ee25 100644
--- a/bin/tar2sqfs/tar2sqfs.c
+++ b/bin/tar2sqfs/tar2sqfs.c
@@ -6,11 +6,38 @@
  */
 #include "tar2sqfs.h"
 
+static int tar_probe(const sqfs_u8 *data, size_t size)
+{
+	size_t i, offset;
+
+	if (size >= TAR_RECORD_SIZE) {
+		for (i = 0; i < TAR_RECORD_SIZE; ++i) {
+			if (data[i] != 0x00)
+				break;
+		}
+
+		if (i == TAR_RECORD_SIZE) {
+			data += TAR_RECORD_SIZE;
+			size -= TAR_RECORD_SIZE;
+		}
+	}
+
+	offset = offsetof(tar_header_t, magic);
+
+	if (offset + 5 <= size) {
+		if (memcmp(data + offset, "ustar", 5) == 0)
+			return 1;
+	}
+
+	return 0;
+}
+
 int main(int argc, char **argv)
 {
 	int status = EXIT_FAILURE;
 	istream_t *input_file = NULL;
 	sqfs_writer_t sqfs;
+	int ret;
 
 	process_args(argc, argv);
 
@@ -18,6 +45,24 @@ int main(int argc, char **argv)
 	if (input_file == NULL)
 		return EXIT_FAILURE;
 
+	ret = istream_detect_compressor(input_file, tar_probe);
+	if (ret < 0)
+		goto out_if;
+
+	if (ret > 0) {
+		if (!fstream_compressor_exists(ret)) {
+			fprintf(stderr,
+				"%s: %s compression is not supported.\n",
+				istream_get_filename(input_file),
+				fstream_compressor_name_from_id(ret));
+			goto out_if;
+		}
+
+		input_file = istream_compressor_create(input_file, ret);
+		if (input_file == NULL)
+			return EXIT_FAILURE;
+	}
+
 	memset(&sqfs, 0, sizeof(sqfs));
 	if (sqfs_writer_init(&sqfs, &cfg))
 		goto out_if;
-- 
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