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path: root/archival/libunarchive/get_header_tar_gz.c
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Diffstat (limited to 'archival/libunarchive/get_header_tar_gz.c')
-rw-r--r--archival/libunarchive/get_header_tar_gz.c9
1 files changed, 8 insertions, 1 deletions
diff --git a/archival/libunarchive/get_header_tar_gz.c b/archival/libunarchive/get_header_tar_gz.c
index 85070d9..a990614 100644
--- a/archival/libunarchive/get_header_tar_gz.c
+++ b/archival/libunarchive/get_header_tar_gz.c
@@ -8,19 +8,26 @@
char 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");
}
check_header_gzip_or_die(archive_handle->src_fd);
+#endif
- 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", "gunzip", "-cf", "-", NULL);
archive_handle->offset = 0;
while (get_header_tar(archive_handle) == EXIT_SUCCESS) /**/;