From 56f16b42c93af18fbb984e8d6384c03e5405e3ae Mon Sep 17 00:00:00 2001
From: Glenn L McGrath <bug1@ihug.co.nz>
Date: Tue, 18 Nov 2003 21:37:52 +0000
Subject: [PATCH] tar -Z, uncompress support

---
 archival/Config.in                            |  8 +++++
 archival/libunarchive/Makefile.in             |  1 +
 archival/libunarchive/decompress_uncompress.c |  5 ----
 archival/libunarchive/uncompress.c            |  5 ----
 archival/tar.c                                | 29 ++++++++++++++++++-
 5 files changed, 37 insertions(+), 11 deletions(-)

diff --git a/archival/Config.in b/archival/Config.in
index 8859bb137..2eab5abfa 100644
--- a/archival/Config.in
+++ b/archival/Config.in
@@ -193,6 +193,14 @@ config CONFIG_FEATURE_TAR_GZIP
 	  If you enable this option tar will be able to call gzip,
 	  when creating or extracting tar gziped archives.
 
+config CONFIG_FEATURE_TAR_COMPRESS
+	bool "  Enable -Z option"
+	default n
+	depends on CONFIG_TAR
+	help
+	  If you enable this option tar will be able to call uncompress,
+	  when extracting .tar.Z archives.
+
 config CONFIG_FEATURE_TAR_OLDGNU_COMPATABILITY
 	bool "  Enable support for old tar header format"
 	default N
diff --git a/archival/libunarchive/Makefile.in b/archival/libunarchive/Makefile.in
index d449c193e..14ceea110 100644
--- a/archival/libunarchive/Makefile.in
+++ b/archival/libunarchive/Makefile.in
@@ -73,6 +73,7 @@ LIBUNARCHIVE-$(CONFIG_RPM) += $(GUNZIP_FILES) get_header_cpio.o
 LIBUNARCHIVE-$(CONFIG_TAR) += get_header_tar.o
 LIBUNARCHIVE-$(CONFIG_FEATURE_TAR_BZIP2) += decompress_bunzip2.o get_header_tar_bz2.o
 LIBUNARCHIVE-$(CONFIG_FEATURE_TAR_GZIP) += $(GUNZIP_FILES) get_header_tar_gz.o
+LIBUNARCHIVE-$(CONFIG_FEATURE_TAR_COMPRESS) += uncompress.o
 LIBUNARCHIVE-$(CONFIG_UNCOMPRESS) += uncompress.o
 LIBUNARCHIVE-$(CONFIG_UNZIP) += $(GUNZIP_FILES)
 
diff --git a/archival/libunarchive/decompress_uncompress.c b/archival/libunarchive/decompress_uncompress.c
index 9851ca39d..5046e8a26 100644
--- a/archival/libunarchive/decompress_uncompress.c
+++ b/archival/libunarchive/decompress_uncompress.c
@@ -1,8 +1,6 @@
 #include "config.h"
 #include "libbb.h"
 
-#if defined CONFIG_UNCOMPRESS || defined CONFIG_FEATURE_GUNZIP_UNCOMPRESS
-
 /* uncompress for busybox -- (c) 2002 Robert Griebl
  *
  * based on the original compress42.c source 
@@ -293,6 +291,3 @@ extern int uncompress(int fd_in, int fd_out)
 
 	return 0;
 }
-
-
-#endif
diff --git a/archival/libunarchive/uncompress.c b/archival/libunarchive/uncompress.c
index 9851ca39d..5046e8a26 100644
--- a/archival/libunarchive/uncompress.c
+++ b/archival/libunarchive/uncompress.c
@@ -1,8 +1,6 @@
 #include "config.h"
 #include "libbb.h"
 
-#if defined CONFIG_UNCOMPRESS || defined CONFIG_FEATURE_GUNZIP_UNCOMPRESS
-
 /* uncompress for busybox -- (c) 2002 Robert Griebl
  *
  * based on the original compress42.c source 
@@ -293,6 +291,3 @@ extern int uncompress(int fd_in, int fd_out)
 
 	return 0;
 }
-
-
-#endif
diff --git a/archival/tar.c b/archival/tar.c
index 7516b5752..4e763a404 100644
--- a/archival/tar.c
+++ b/archival/tar.c
@@ -594,8 +594,27 @@ static llist_t *append_file_list_to_list(llist_t *list)
 }
 #endif
 
+#ifdef CONFIG_FEATURE_TAR_COMPRESS
+static char get_header_tar_Z(archive_handle_t *archive_handle)
+{
+	/* Cant lseek over pipe's */
+	archive_handle->seek = seek_by_char;
 
-static const char tar_options[]="ctxjT:X:C:f:Opvzk";
+	/* do the decompression, and cleanup */
+	if ((bb_xread_char(archive_handle->src_fd) != 0x1f) || (bb_xread_char(archive_handle->src_fd) != 0x9d)) {
+		bb_error_msg_and_die("Invalid magic");
+	}
+
+	archive_handle->src_fd = open_transformer(archive_handle->src_fd, uncompress);
+	archive_handle->offset = 0;
+	while (get_header_tar(archive_handle) == EXIT_SUCCESS);
+
+	/* Can only do one file at a time */
+	return(EXIT_FAILURE);
+}
+#endif
+
+static const char tar_options[]="ctxjT:X:C:f:OpvzkZ";
 
 #define CTX_CREATE	1
 #define CTX_TEST	2
@@ -610,6 +629,7 @@ static const char tar_options[]="ctxjT:X:C:f:Opvzk";
 #define TAR_OPT_VERBOSE  1024
 #define TAR_OPT_GZIP     2048
 #define TAR_OPT_KEEP_OLD	4096
+#define TAR_OPT_UNCOMPRESS	8192
 
 int tar_main(int argc, char **argv)
 {
@@ -688,6 +708,13 @@ int tar_main(int argc, char **argv)
 		get_header_ptr = get_header_tar_bz2;
 #else
 		bb_show_usage();
+#endif
+	}
+	if(opt & TAR_OPT_UNCOMPRESS) {
+#ifdef CONFIG_FEATURE_TAR_COMPRESS
+		get_header_ptr = get_header_tar_Z;
+#else
+		bb_show_usage();
 #endif
 	}
 	if(opt & TAR_OPT_EXCLUDE) {