add comment clarifying busybox's use of non-standard tar header

2 files changed, 7 insertions, 1 deletions

diff --git a/archival/libunarchive/get_header_tar.c b/archival/libunarchive/get_header_tar.c
index bbf088cd8..274bd4607 100644
--- a/archival/libunarchive/get_header_tar.c
+++ b/archival/libunarchive/get_header_tar.c
@@ -61,6 +61,9 @@ char get_header_tar(archive_handle_t *archive_handle)
                 char linkname[100]; /* 157-256 */
                 /* POSIX:   "ustar" NUL "00" */
                 /* GNU tar: "ustar  " NUL */
+                /* Normally it's defined as magic[6] followed by
+                 * version[2], but we put them together to save code.
+                 */
                 char magic[8];      /* 257-264 */
                 char uname[32];     /* 265-296 */
                 char gname[32];     /* 297-328 */
diff --git a/archival/tar.c b/archival/tar.c
index bbde88a57..5b19093e8 100644
--- a/archival/tar.c
+++ b/archival/tar.c
@@ -52,13 +52,16 @@ struct TarHeader {		  /* byte offset */
         char linkname[NAME_SIZE]; /* 157-256 */
         /* POSIX:   "ustar" NUL "00" */
         /* GNU tar: "ustar  " NUL */
+        /* Normally it's defined as magic[6] followed by
+         * version[2], but we put them together to save code.
+         */
         char magic[8];            /* 257-264 */
         char uname[32];           /* 265-296 */
         char gname[32];           /* 297-328 */
         char devmajor[8];         /* 329-336 */
         char devminor[8];         /* 337-344 */
         char prefix[155];         /* 345-499 */
-        char padding[12];         /* 500-512 (pad to exactly the TAR_BLOCK_SIZE) */
+        char padding[12];         /* 500-512 (pad to exactly TAR_BLOCK_SIZE) */
 };
 
 /*