X-Git-Url: https://git.librecmc.org/?a=blobdiff_plain;f=archival%2Flibunarchive%2Fget_header_tar_gz.c;h=33c62729e55416ec36df204e0063ac93d5c9943c;hb=82604e973085f91f1b99cacea08963d0d1468084;hp=85070d97855e0fd607b5ba190e9e98dc2445d756;hpb=c14d39e83a7f55ab9b92e98673a281fd6565c32d;p=oweals%2Fbusybox.git

diff --git a/archival/libunarchive/get_header_tar_gz.c b/archival/libunarchive/get_header_tar_gz.c
index 85070d978..33c62729e 100644
--- a/archival/libunarchive/get_header_tar_gz.c
+++ b/archival/libunarchive/get_header_tar_gz.c
@@ -6,23 +6,29 @@
 #include "libbb.h"
 #include "unarchive.h"
 
-char get_header_tar_gz(archive_handle_t *archive_handle)
+char FAST_FUNC get_header_tar_gz(archive_handle_t *archive_handle)
 {
+#if BB_MMU
 	unsigned char magic[2];
+#endif
 
 	/* Can't lseek over pipes */
 	archive_handle->seek = seek_by_read;
 
+	/* Check gzip magic only if open_transformer will invoke unpack_gz_stream (MMU case).
+	 * Otherwise, it will invoke an external helper "gunzip -cf" (NOMMU case) which will
+	 * need the header. */
+#if BB_MMU
 	xread(archive_handle->src_fd, &magic, 2);
 	if ((magic[0] != 0x1f) || (magic[1] != 0x8b)) {
 		bb_error_msg_and_die("invalid gzip magic");
 	}
+#endif
 
-	check_header_gzip_or_die(archive_handle->src_fd);
-
-	archive_handle->src_fd = open_transformer(archive_handle->src_fd, unpack_gz_stream);
+	archive_handle->src_fd = open_transformer(archive_handle->src_fd, unpack_gz_stream, "gunzip");
 	archive_handle->offset = 0;
-	while (get_header_tar(archive_handle) == EXIT_SUCCESS) /**/;
+	while (get_header_tar(archive_handle) == EXIT_SUCCESS)
+		continue;
 
 	/* Can only do one file at a time */
 	return EXIT_FAILURE;