*: refactor handling of archived files. "tar f file.tar.lzma" now works too.

function                                             old     new   delta
unpack_Z_stream                                        -    1229   +1229
open_zipped                                            -     176    +176
unpack_bz2_stream_prime                                -      60     +60
tar_main                                             642     677     +35
find_main                                            406     418     +12
sv_main                                             1222    1233     +11
decode_format_string                                 829     837      +8
cmp_main                                             641     649      +8
popstring                                            134     140      +6
filter_accept_list_reassign                          120     125      +5
parse_and_put_prompt                                 800     804      +4
passwd_main                                         1053    1049      -4
make_new_name_gunzip                                 119     114      -5
rpm_main                                            1688    1670     -18
prepare                                              302     283     -19
xmalloc_open_zipped_read_close                       135      61     -74
uncompress                                          1229       -   -1229
------------------------------------------------------------------------------
(add/remove: 3/1 grow/shrink: 8/5 up/down: 1554/-1349)        Total: 205 bytes

21 files changed, 324 insertions, 319 deletions

diff --git a/TODO_config_nommu b/TODO_config_nommu
index 308e5d7..90bd5b2 100644
--- a/TODO_config_nommu
+++ b/TODO_config_nommu
@@ -1,7 +1,7 @@
 #
 # Automatically generated make config: don't edit
-# Busybox version: 1.11.0.svn
-# Mon Apr 21 23:20:35 2008
+# Busybox version: 1.12.0.svn
+# Tue Aug  5 14:43:04 2008
 #
 CONFIG_HAVE_DOT_CONFIG=y
 
@@ -13,6 +13,7 @@ CONFIG_HAVE_DOT_CONFIG=y
 # General Configuration
 #
 CONFIG_DESKTOP=y
+CONFIG_FEATURE_ASSUME_UNICODE=y
 CONFIG_FEATURE_BUFFERS_USE_MALLOC=y
 # CONFIG_FEATURE_BUFFERS_GO_ON_STACK is not set
 # CONFIG_FEATURE_BUFFERS_GO_IN_BSS is not set
@@ -38,21 +39,25 @@ CONFIG_FEATURE_HAVE_RPC=y
 # Build Options
 #
 # CONFIG_STATIC is not set
+# CONFIG_PIE is not set
 CONFIG_NOMMU=y
 # CONFIG_BUILD_LIBBUSYBOX is not set
 # CONFIG_FEATURE_INDIVIDUAL is not set
 # CONFIG_FEATURE_SHARED_BUSYBOX is not set
 CONFIG_LFS=y
+CONFIG_CROSS_COMPILER_PREFIX=""
 
 #
 # Debugging Options
 #
 # CONFIG_DEBUG is not set
+# CONFIG_DEBUG_PESSIMIZE is not set
 # CONFIG_WERROR is not set
 CONFIG_NO_DEBUG_LIB=y
 # CONFIG_DMALLOC is not set
 # CONFIG_EFENCE is not set
 CONFIG_INCLUDE_SUSv2=y
+# CONFIG_PARSE is not set
 
 #
 # Installation Options
@@ -86,6 +91,7 @@ CONFIG_FEATURE_VERBOSE_CP_MESSAGE=y
 CONFIG_FEATURE_COPYBUF_KB=4
 CONFIG_MONOTONIC_SYSCALL=y
 CONFIG_IOCTL_HEX2STR_ERROR=y
+CONFIG_FEATURE_HWIB=y
 
 #
 # Applets
@@ -94,6 +100,10 @@ CONFIG_IOCTL_HEX2STR_ERROR=y
 #
 # Archival Utilities
 #
+CONFIG_FEATURE_SEAMLESS_LZMA=y
+CONFIG_FEATURE_SEAMLESS_BZ2=y
+CONFIG_FEATURE_SEAMLESS_GZ=y
+CONFIG_FEATURE_SEAMLESS_Z=y
 CONFIG_AR=y
 CONFIG_FEATURE_AR_LONG_FILENAMES=y
 CONFIG_BUNZIP2=y
@@ -104,17 +114,11 @@ CONFIG_DPKG=y
 CONFIG_DPKG_DEB=y
 CONFIG_FEATURE_DPKG_DEB_EXTRACT_ONLY=y
 CONFIG_GUNZIP=y
-CONFIG_FEATURE_GUNZIP_UNCOMPRESS=y
 CONFIG_GZIP=y
 CONFIG_RPM2CPIO=y
 CONFIG_RPM=y
-CONFIG_FEATURE_RPM_BZ2=y
 CONFIG_TAR=y
 CONFIG_FEATURE_TAR_CREATE=y
-CONFIG_FEATURE_TAR_GZIP=y
-CONFIG_FEATURE_TAR_BZIP2=y
-CONFIG_FEATURE_TAR_LZMA=y
-CONFIG_FEATURE_TAR_COMPRESS=y
 CONFIG_FEATURE_TAR_AUTODETECT=y
 CONFIG_FEATURE_TAR_FROM=y
 CONFIG_FEATURE_TAR_OLDGNU_COMPATIBILITY=y
@@ -128,17 +132,6 @@ CONFIG_FEATURE_LZMA_FAST=y
 CONFIG_UNZIP=y
 
 #
-# Common options for cpio and tar
-#
-
-#
-# Common options for dpkg and dpkg_deb
-#
-CONFIG_FEATURE_DEB_TAR_GZ=y
-CONFIG_FEATURE_DEB_TAR_BZ2=y
-CONFIG_FEATURE_DEB_TAR_LZMA=y
-
-#
 # Coreutils
 #
 CONFIG_BASENAME=y
@@ -216,6 +209,7 @@ CONFIG_SEQ=y
 CONFIG_SHA1SUM=y
 CONFIG_SLEEP=y
 CONFIG_FEATURE_FANCY_SLEEP=y
+CONFIG_FEATURE_FLOAT_SLEEP=y
 CONFIG_SORT=y
 CONFIG_FEATURE_SORT_BIG=y
 CONFIG_SPLIT=y
@@ -386,8 +380,9 @@ CONFIG_MESG=y
 # Login/Password Management Utilities
 #
 CONFIG_FEATURE_SHADOWPASSWDS=y
-CONFIG_USE_BB_SHADOW=y
 CONFIG_USE_BB_PWD_GRP=y
+CONFIG_USE_BB_SHADOW=y
+CONFIG_USE_BB_CRYPT=y
 CONFIG_ADDGROUP=y
 CONFIG_FEATURE_ADDUSER_TO_GROUP=y
 CONFIG_DELGROUP=y
@@ -424,25 +419,30 @@ CONFIG_LSATTR=y
 #
 # Linux Module Utilities
 #
-CONFIG_INSMOD=y
-CONFIG_FEATURE_INSMOD_VERSION_CHECKING=y
-CONFIG_FEATURE_INSMOD_KSYMOOPS_SYMBOLS=y
-CONFIG_FEATURE_INSMOD_LOADINKMEM=y
-CONFIG_FEATURE_INSMOD_LOAD_MAP=y
-CONFIG_FEATURE_INSMOD_LOAD_MAP_FULL=y
-CONFIG_RMMOD=y
-CONFIG_LSMOD=y
-CONFIG_FEATURE_LSMOD_PRETTY_2_6_OUTPUT=y
-CONFIG_MODPROBE=y
-CONFIG_FEATURE_MODPROBE_MULTIPLE_OPTIONS=y
-CONFIG_FEATURE_MODPROBE_FANCY_ALIAS=y
-
-#
-# Options common to multiple modutils
-#
-CONFIG_FEATURE_CHECK_TAINTED_MODULE=y
-CONFIG_FEATURE_2_4_MODULES=y
-CONFIG_FEATURE_2_6_MODULES=y
+CONFIG_MODPROBE_SMALL=y
+CONFIG_FEATURE_MODPROBE_SMALL_OPTIONS_ON_CMDLINE=y
+CONFIG_FEATURE_MODPROBE_SMALL_CHECK_ALREADY_LOADED=y
+# CONFIG_DEPMOD is not set
+# CONFIG_FEATURE_DEPMOD_PRUNE_FANCY is not set
+# CONFIG_FEATURE_DEPMOD_ALIAS is not set
+# CONFIG_INSMOD is not set
+# CONFIG_FEATURE_INSMOD_VERSION_CHECKING is not set
+# CONFIG_FEATURE_INSMOD_KSYMOOPS_SYMBOLS is not set
+# CONFIG_FEATURE_INSMOD_LOADINKMEM is not set
+# CONFIG_FEATURE_INSMOD_LOAD_MAP is not set
+# CONFIG_FEATURE_INSMOD_LOAD_MAP_FULL is not set
+# CONFIG_RMMOD is not set
+# CONFIG_LSMOD is not set
+# CONFIG_FEATURE_LSMOD_PRETTY_2_6_OUTPUT is not set
+# CONFIG_MODPROBE is not set
+# CONFIG_FEATURE_MODPROBE_MULTIPLE_OPTIONS is not set
+# CONFIG_FEATURE_MODPROBE_FANCY_ALIAS is not set
+# CONFIG_FEATURE_MODPROBE_BLACKLIST is not set
+# CONFIG_FEATURE_CHECK_TAINTED_MODULE is not set
+# CONFIG_FEATURE_2_4_MODULES is not set
+# CONFIG_FEATURE_2_6_MODULES is not set
+CONFIG_DEFAULT_MODULES_DIR="/lib/modules"
+CONFIG_DEFAULT_DEPMOD_FILE="modules.dep"
 # CONFIG_FEATURE_QUERY_MODULE_INTERFACE is not set
 
 #
@@ -525,6 +525,7 @@ CONFIG_RTCWAKE=y
 CONFIG_SCRIPT=y
 CONFIG_SETARCH=y
 CONFIG_SWAPONOFF=y
+CONFIG_FEATURE_SWAPON_PRI=y
 CONFIG_SWITCH_ROOT=y
 CONFIG_UMOUNT=y
 CONFIG_FEATURE_UMOUNT_ALL=y
@@ -562,7 +563,10 @@ CONFIG_DC=y
 CONFIG_EJECT=y
 CONFIG_FEATURE_EJECT_SCSI=y
 CONFIG_FBSPLASH=y
+CONFIG_INOTIFYD=y
 CONFIG_LAST=y
+CONFIG_FEATURE_LAST_SMALL=y
+# CONFIG_FEATURE_LAST_FANCY is not set
 CONFIG_LESS=y
 CONFIG_FEATURE_LESS_MAXLINES=9999999
 CONFIG_FEATURE_LESS_BRACKETS=y
@@ -590,7 +594,6 @@ CONFIG_RUNLEVEL=y
 CONFIG_RX=y
 CONFIG_SETSID=y
 CONFIG_STRINGS=y
-CONFIG_SYMLINKS=y
 CONFIG_TASKSET=y
 CONFIG_FEATURE_TASKSET_FANCY=y
 CONFIG_TIME=y
@@ -675,6 +678,7 @@ CONFIG_NC_SERVER=y
 CONFIG_NC_EXTRA=y
 CONFIG_NETSTAT=y
 CONFIG_FEATURE_NETSTAT_WIDE=y
+CONFIG_FEATURE_NETSTAT_PRG=y
 CONFIG_NSLOOKUP=y
 CONFIG_PING=y
 CONFIG_PING6=y
@@ -765,6 +769,7 @@ CONFIG_FEATURE_SH_IS_NONE=y
 # CONFIG_ASH_MATH_SUPPORT_64 is not set
 # CONFIG_ASH_GETOPTS is not set
 # CONFIG_ASH_BUILTIN_ECHO is not set
+# CONFIG_ASH_BUILTIN_PRINTF is not set
 # CONFIG_ASH_BUILTIN_TEST is not set
 # CONFIG_ASH_CMDCMD is not set
 # CONFIG_ASH_MAIL is not set
@@ -778,6 +783,7 @@ CONFIG_HUSH_JOB=y
 CONFIG_HUSH_TICK=y
 CONFIG_HUSH_IF=y
 CONFIG_HUSH_LOOPS=y
+CONFIG_HUSH_CASE=y
 CONFIG_LASH=y
 CONFIG_MSH=y
 
diff --git a/archival/Config.in b/archival/Config.in
index b26be64..d6332a2 100644
--- a/archival/Config.in
+++ b/archival/Config.in
@@ -5,6 +5,30 @@
 
 menu "Archival Utilities"
 
+config FEATURE_SEAMLESS_LZMA
+	bool "Make tar, rpm, man, modprobe etc understand .lzma data"
+	default n
+	help
+	  Make tar, rpm, man, modprobe etc understand .lzma data.
+
+config FEATURE_SEAMLESS_BZ2
+	bool "Make tar, rpm, man, modprobe etc understand .bz2 data"
+	default n
+	help
+	  Make tar, rpm, man, modprobe etc understand .bz2 data.
+
+config FEATURE_SEAMLESS_GZ
+	bool "Make tar, rpm, man, modprobe etc understand .gz data"
+	default n
+	help
+	  Make tar, rpm, man, modprobe etc understand .gz data.
+
+config FEATURE_SEAMLESS_Z
+	bool "Make tar and gunzip understand .Z data"
+	default n
+	help
+	  Make tar and gunzip understand .Z data.
+
 config AR
 	bool "ar"
 	default n
@@ -126,15 +150,6 @@ config GUNZIP
 	  You can use the `-t' option to test the integrity of
 	  an archive, without decompressing it.
 
-config FEATURE_GUNZIP_UNCOMPRESS
-	bool "Uncompress support"
-	default n
-	depends on GUNZIP
-	help
-	  Enable if you want gunzip to have the ability to decompress
-	  archives created by the program compress (not much
-	  used anymore).
-
 config GZIP
 	bool "gzip"
 	default n
@@ -154,13 +169,6 @@ config RPM
 	help
 	  Mini RPM applet - queries and extracts RPM packages.
 
-config FEATURE_RPM_BZ2
-	bool "Enable handling of rpms with bzip2-compressed data inside"
-	default n
-	depends on RPM
-	help
-	  Enable handling of rpms with bzip2-compressed data inside.
-
 config TAR
 	bool "tar"
 	default n
@@ -179,42 +187,10 @@ config FEATURE_TAR_CREATE
 	  If you enable this option you'll be able to create
 	  tar archives using the `-c' option.
 
-config FEATURE_TAR_GZIP
-	bool "Enable -z option"
-	default y
-	depends on TAR
-	help
-	  If you enable this option tar will be able to call gzip,
-	  when creating or extracting tar gziped archives.
-
-config FEATURE_TAR_BZIP2
-	bool "Enable -j option to handle .tar.bz2 files"
-	default n
-	depends on TAR
-	help
-	  If you enable this option you'll be able to extract
-	  archives compressed with bzip2.
-
-config FEATURE_TAR_LZMA
-	bool "Enable -a option to handle .tar.lzma files"
-	default n
-	depends on TAR
-	help
-	  If you enable this option you'll be able to extract
-	  archives compressed with lzma.
-
-config FEATURE_TAR_COMPRESS
-	bool "Enable -Z option"
-	default n
-	depends on TAR
-	help
-	  If you enable this option tar will be able to call uncompress,
-	  when extracting .tar.Z archives.
-
 config FEATURE_TAR_AUTODETECT
-	bool "Autodetect gz/bz2 compresses tarballs"
+	bool "Autodetect gz/bz2 compressed tarballs"
 	default n
-	depends on FEATURE_TAR_GZIP || FEATURE_TAR_BZIP2
+	depends on FEATURE_SEAMLESS_Z || FEATURE_SEAMLESS_GZ || FEATURE_SEAMLESS_BZ2 || FEATURE_SEAMLESS_LZMA
 	help
 	  With this option tar can automatically detect gzip/bzip2 compressed
 	  tarballs. Currently it works only on files (not pipes etc).
@@ -312,42 +288,4 @@ config UNZIP
 	  current directory. Use the `-d' option to extract to a
 	  directory of your choice.
 
-comment "Common options for cpio and tar"
-	depends on CPIO || TAR
-
-comment "Common options for dpkg and dpkg_deb"
-	depends on DPKG || DPKG_DEB
-
-config FEATURE_DEB_TAR_GZ
-	bool "gzip debian packages (normal)"
-	default y if DPKG || DPKG_DEB
-	depends on DPKG || DPKG_DEB
-	help
-	  This is the default compression method inside the debian ar file.
-
-	  If you want compatibility with standard .deb's you should say yes
-	  here.
-
-config FEATURE_DEB_TAR_BZ2
-	bool "bzip2 debian packages"
-	default n
-	depends on DPKG || DPKG_DEB
-	help
-	  This allows dpkg and dpkg-deb to extract deb's that are compressed
-	  internally with bzip2 instead of gzip.
-
-	  You only want this if you are creating your own custom debian
-	  packages that use an internal control.tar.bz2 or data.tar.bz2.
-
-config FEATURE_DEB_TAR_LZMA
-	bool "lzma debian packages"
-	default n
-	depends on DPKG || DPKG_DEB
-	help
-	  This allows dpkg and dpkg-deb to extract deb's that are compressed
-	  internally with lzma instead of gzip.
-
-	  You only want this if you are creating your own custom debian
-	  packages that use an internal control.tar.lzma or data.tar.lzma.
-
 endmenu
diff --git a/archival/bbunzip.c b/archival/bbunzip.c
index 65bb8b7..c796205 100644
--- a/archival/bbunzip.c
+++ b/archival/bbunzip.c
@@ -161,7 +161,7 @@ char* make_new_name_bunzip2(char *filename)
 static
 USE_DESKTOP(long long) int unpack_bunzip2(void)
 {
-	return unpack_bz2_stream(STDIN_FILENO, STDOUT_FILENO);
+	return unpack_bz2_stream_prime(STDIN_FILENO, STDOUT_FILENO);
 }
 
 int bunzip2_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
@@ -218,8 +218,8 @@ char* make_new_name_gunzip(char *filename)
 
 	extension++;
 	if (strcmp(extension, "tgz" + 1) == 0
-#if ENABLE_FEATURE_GUNZIP_UNCOMPRESS
-	 || strcmp(extension, "Z") == 0
+#if ENABLE_FEATURE_SEAMLESS_Z
+	 || (extension[0] == 'Z' && extension[1] == '\0')
 #endif
 	) {
 		extension[-1] = '\0';
@@ -244,8 +244,8 @@ USE_DESKTOP(long long) int unpack_gunzip(void)
 		unsigned char magic2;
 
 		magic2 = xread_char(STDIN_FILENO);
-		if (ENABLE_FEATURE_GUNZIP_UNCOMPRESS && magic2 == 0x9d) {
-			status = uncompress(STDIN_FILENO, STDOUT_FILENO);
+		if (ENABLE_FEATURE_SEAMLESS_Z && magic2 == 0x9d) {
+			status = unpack_Z_stream(STDIN_FILENO, STDOUT_FILENO);
 		} else if (magic2 == 0x8b) {
 			status = unpack_gz_stream(STDIN_FILENO, STDOUT_FILENO);
 		} else {
@@ -351,7 +351,7 @@ USE_DESKTOP(long long) int unpack_uncompress(void)
 	if ((xread_char(STDIN_FILENO) != 0x1f) || (xread_char(STDIN_FILENO) != 0x9d)) {
 		bb_error_msg("invalid magic");
 	} else {
-		status = uncompress(STDIN_FILENO, STDOUT_FILENO);
+		status = unpack_Z_stream(STDIN_FILENO, STDOUT_FILENO);
 	}
 	return status;
 }
diff --git a/archival/dpkg.c b/archival/dpkg.c
index 54e9632..f31a7f0 100644
--- a/archival/dpkg.c
+++ b/archival/dpkg.c
@@ -1438,10 +1438,10 @@ static void init_archive_deb_control(archive_handle_t *ar_handle)
 	tar_handle->src_fd = ar_handle->src_fd;
 
 	/* We don't care about data.tar.* or debian-binary, just control.tar.* */
-#if ENABLE_FEATURE_DEB_TAR_GZ
+#if ENABLE_FEATURE_SEAMLESS_GZ
 	llist_add_to(&(ar_handle->accept), (char*)"control.tar.gz");
 #endif
-#if ENABLE_FEATURE_DEB_TAR_BZ2
+#if ENABLE_FEATURE_SEAMLESS_BZ2
 	llist_add_to(&(ar_handle->accept), (char*)"control.tar.bz2");
 #endif
 
@@ -1458,10 +1458,10 @@ static void init_archive_deb_data(archive_handle_t *ar_handle)
 	tar_handle->src_fd = ar_handle->src_fd;
 
 	/* We don't care about control.tar.* or debian-binary, just data.tar.* */
-#if ENABLE_FEATURE_DEB_TAR_GZ
+#if ENABLE_FEATURE_SEAMLESS_GZ
 	llist_add_to(&(ar_handle->accept), (char*)"data.tar.gz");
 #endif
-#if ENABLE_FEATURE_DEB_TAR_BZ2
+#if ENABLE_FEATURE_SEAMLESS_BZ2
 	llist_add_to(&(ar_handle->accept), (char*)"data.tar.bz2");
 #endif
 
diff --git a/archival/dpkg_deb.c b/archival/dpkg_deb.c
index 9e6340f..f94c90c 100644
--- a/archival/dpkg_deb.c
+++ b/archival/dpkg_deb.c
@@ -31,12 +31,12 @@ int dpkg_deb_main(int argc, char **argv)
 	ar_archive->sub_archive = tar_archive;
 	ar_archive->filter = filter_accept_list_reassign;
 
-#if ENABLE_FEATURE_DEB_TAR_GZ
+#if ENABLE_FEATURE_SEAMLESS_GZ
 	llist_add_to(&(ar_archive->accept), (char*)"data.tar.gz");
 	llist_add_to(&control_tar_llist, (char*)"control.tar.gz");
 #endif
 
-#if ENABLE_FEATURE_DEB_TAR_BZ2
+#if ENABLE_FEATURE_SEAMLESS_BZ2
 	llist_add_to(&(ar_archive->accept), (char*)"data.tar.bz2");
 	llist_add_to(&control_tar_llist, (char*)"control.tar.bz2");
 #endif
diff --git a/archival/libunarchive/Kbuild b/archival/libunarchive/Kbuild
index 468a7e8..364f917 100644
--- a/archival/libunarchive/Kbuild
+++ b/archival/libunarchive/Kbuild
@@ -32,36 +32,20 @@ DPKG_FILES:= \
 	get_header_tar.o \
 	filter_accept_list_reassign.o
 
-lib-$(CONFIG_RPM)                       += open_transformer.o
-lib-$(CONFIG_FEATURE_TAR_BZIP2)         += open_transformer.o
-lib-$(CONFIG_FEATURE_TAR_LZMA)          += open_transformer.o
-lib-$(CONFIG_FEATURE_TAR_GZIP)          += open_transformer.o
-lib-$(CONFIG_FEATURE_TAR_COMPRESS)      += open_transformer.o
-lib-$(CONFIG_FEATURE_DEB_TAR_GZ)        += open_transformer.o
-lib-$(CONFIG_FEATURE_DEB_TAR_BZ2)       += open_transformer.o
-lib-$(CONFIG_FEATURE_DEB_TAR_LZMA)      += open_transformer.o
-
-lib-$(CONFIG_FEATURE_MODPROBE_SMALL_ZIPPED) += open_transformer.o decompress_unzip.o decompress_bunzip2.o
-
 lib-$(CONFIG_AR)                        += get_header_ar.o unpack_ar_archive.o
 lib-$(CONFIG_BUNZIP2)                   += decompress_bunzip2.o
 lib-$(CONFIG_UNLZMA)                    += decompress_unlzma.o
 lib-$(CONFIG_CPIO)                      += get_header_cpio.o
 lib-$(CONFIG_DPKG)                      += $(DPKG_FILES)
 lib-$(CONFIG_DPKG_DEB)                  += $(DPKG_FILES)
-lib-$(CONFIG_FEATURE_DEB_TAR_GZ)        += decompress_unzip.o get_header_tar_gz.o
-lib-$(CONFIG_FEATURE_DEB_TAR_BZ2)       += decompress_bunzip2.o get_header_tar_bz2.o
-lib-$(CONFIG_FEATURE_DEB_TAR_LZMA)      += decompress_unlzma.o get_header_tar_lzma.o
 lib-$(CONFIG_GUNZIP)                    += decompress_unzip.o
-lib-$(CONFIG_FEATURE_GUNZIP_UNCOMPRESS) += decompress_uncompress.o
 lib-$(CONFIG_RPM2CPIO)                  += decompress_unzip.o get_header_cpio.o
-lib-$(CONFIG_RPM)                       += decompress_unzip.o get_header_cpio.o
-lib-$(CONFIG_FEATURE_RPM_BZ2)           += decompress_bunzip2.o
+lib-$(CONFIG_RPM)                       += open_transformer.o decompress_unzip.o get_header_cpio.o
 lib-$(CONFIG_TAR)                       += get_header_tar.o
-lib-$(CONFIG_FEATURE_TAR_BZIP2)         += decompress_bunzip2.o get_header_tar_bz2.o
-lib-$(CONFIG_FEATURE_TAR_LZMA)          += decompress_unlzma.o get_header_tar_lzma.o
-lib-$(CONFIG_FEATURE_TAR_GZIP)          += decompress_unzip.o get_header_tar_gz.o
-lib-$(CONFIG_FEATURE_TAR_COMPRESS)      += decompress_uncompress.o
 lib-$(CONFIG_UNCOMPRESS)                += decompress_uncompress.o
 lib-$(CONFIG_UNZIP)                     += decompress_unzip.o
+lib-$(CONFIG_FEATURE_SEAMLESS_Z)        += open_transformer.o decompress_uncompress.o
+lib-$(CONFIG_FEATURE_SEAMLESS_GZ)       += open_transformer.o decompress_unzip.o get_header_tar_gz.o
+lib-$(CONFIG_FEATURE_SEAMLESS_BZ2)      += open_transformer.o decompress_bunzip2.o get_header_tar_bz2.o
+lib-$(CONFIG_FEATURE_SEAMLESS_LZMA)     += open_transformer.o decompress_unlzma.o get_header_tar_lzma.o
 lib-$(CONFIG_FEATURE_COMPRESS_USAGE)    += decompress_bunzip2.o
diff --git a/archival/libunarchive/decompress_bunzip2.c b/archival/libunarchive/decompress_bunzip2.c
index 654dc28..b53720f 100644
--- a/archival/libunarchive/decompress_bunzip2.c
+++ b/archival/libunarchive/decompress_bunzip2.c
@@ -590,7 +590,8 @@ int FAST_FUNC start_bunzip(bunzip_data **bdp, int in_fd, const unsigned char *in
 	bunzip_data *bd;
 	unsigned i;
 	enum {
-		BZh0 = ('B' << 24) + ('Z' << 16) + ('h' << 8) + '0'
+		BZh0 = ('B' << 24) + ('Z' << 16) + ('h' << 8) + '0',
+		h0 = ('h' << 8) + '0',
 	};
 
 	/* Figure out how much data to allocate */
@@ -617,12 +618,18 @@ int FAST_FUNC start_bunzip(bunzip_data **bdp, int in_fd, const unsigned char *in
 	if (i) return i;
 
 	/* Ensure that file starts with "BZh['1'-'9']." */
-	i = get_bits(bd, 32);
-	if ((unsigned)(i - BZh0 - 1) >= 9) return RETVAL_NOT_BZIP_DATA;
+	/* Update: now caller verifies 1st two bytes, makes .gz/.bz2
+	 * integration easier */
+	/* was: */
+	/* i = get_bits(bd, 32); */
+	/* if ((unsigned)(i - BZh0 - 1) >= 9) return RETVAL_NOT_BZIP_DATA; */
+	i = get_bits(bd, 16);
+	if ((unsigned)(i - h0 - 1) >= 9) return RETVAL_NOT_BZIP_DATA;
 
 	/* Fourth byte (ascii '1'-'9') indicates block size in units of 100k of
 	   uncompressed data.  Allocate intermediate buffer for block. */
-	bd->dbufSize = 100000 * (i - BZh0);
+	/* bd->dbufSize = 100000 * (i - BZh0); */
+	bd->dbufSize = 100000 * (i - h0);
 
 	/* Cannot use xmalloc - may leak bd in NOFORK case! */
 	bd->dbuf = malloc_or_warn(bd->dbufSize * sizeof(int));
@@ -682,6 +689,17 @@ unpack_bz2_stream(int src_fd, int dst_fd)
 	return i ? i : USE_DESKTOP(total_written) + 0;
 }
 
+USE_DESKTOP(long long) int FAST_FUNC
+unpack_bz2_stream_prime(int src_fd, int dst_fd)
+{
+	unsigned char magic[2];
+	xread(src_fd, magic, 2);
+	if (magic[0] != 'B' || magic[1] != 'Z') {
+		bb_error_msg_and_die("invalid magic");
+	}
+	return unpack_bz2_stream(src_fd, dst_fd);
+}
+
 #ifdef TESTING
 
 static char *const bunzip_errors[] = {
@@ -693,9 +711,10 @@ static char *const bunzip_errors[] = {
 /* Dumb little test thing, decompress stdin to stdout */
 int main(int argc, char **argv)
 {
-	int i = unpack_bz2_stream(0, 1);
+	int i;
 	char c;
 
+	int i = unpack_bz2_stream_prime(0, 1);
 	if (i < 0)
 		fprintf(stderr, "%s\n", bunzip_errors[-i]);
 	else if (read(STDIN_FILENO, &c, 1))
diff --git a/archival/libunarchive/decompress_uncompress.c b/archival/libunarchive/decompress_uncompress.c
index 1615700..fe1491e 100644
--- a/archival/libunarchive/decompress_uncompress.c
+++ b/archival/libunarchive/decompress_uncompress.c
@@ -1,6 +1,4 @@
 /* vi: set sw=4 ts=4: */
-#include "libbb.h"
-
 /* uncompress for busybox -- (c) 2002 Robert Griebl
  *
  * based on the original compress42.c source
@@ -26,6 +24,10 @@
  *
  */
 
+#include "libbb.h"
+#include "unarchive.h"
+
+
 /* Default input buffer size */
 #define	IBUFSIZ	2048
 
@@ -71,7 +73,7 @@
  */
 
 USE_DESKTOP(long long) int FAST_FUNC
-uncompress(int fd_in, int fd_out)
+unpack_Z_stream(int fd_in, int fd_out)
 {
 	USE_DESKTOP(long long total_written = 0;)
 	USE_DESKTOP(long long) int retval = -1;
diff --git a/archival/libunarchive/filter_accept_list_reassign.c b/archival/libunarchive/filter_accept_list_reassign.c
index 4dbc2d1..f1de4e8 100644
--- a/archival/libunarchive/filter_accept_list_reassign.c
+++ b/archival/libunarchive/filter_accept_list_reassign.c
@@ -23,22 +23,25 @@ char FAST_FUNC filter_accept_list_reassign(archive_handle_t *archive_handle)
 
 		/* Find extension */
 		name_ptr = strrchr(archive_handle->file_header->name, '.');
+		if (!name_ptr)
+			return EXIT_FAILURE;
+		name_ptr++;
 
 		/* Modify the subarchive handler based on the extension */
-		if (ENABLE_FEATURE_DEB_TAR_GZ
-		 && strcmp(name_ptr, ".gz") == 0
+		if (ENABLE_FEATURE_SEAMLESS_GZ
+		 && strcmp(name_ptr, "gz") == 0
 		) {
 			archive_handle->action_data_subarchive = get_header_tar_gz;
 			return EXIT_SUCCESS;
 		}
-		if (ENABLE_FEATURE_DEB_TAR_BZ2
-		 && strcmp(name_ptr, ".bz2") == 0
+		if (ENABLE_FEATURE_SEAMLESS_BZ2
+		 && strcmp(name_ptr, "bz2") == 0
 		) {
 			archive_handle->action_data_subarchive = get_header_tar_bz2;
 			return EXIT_SUCCESS;
 		}
-		if (ENABLE_FEATURE_DEB_TAR_LZMA
-		 && strcmp(name_ptr, ".lzma") == 0
+		if (ENABLE_FEATURE_SEAMLESS_LZMA
+		 && strcmp(name_ptr, "lzma") == 0
 		) {
 			archive_handle->action_data_subarchive = get_header_tar_lzma;
 			return EXIT_SUCCESS;
diff --git a/archival/libunarchive/get_header_tar.c b/archival/libunarchive/get_header_tar.c
index 5310f3f..bf0f92b 100644
--- a/archival/libunarchive/get_header_tar.c
+++ b/archival/libunarchive/get_header_tar.c
@@ -148,12 +148,12 @@ char FAST_FUNC get_header_tar(archive_handle_t *archive_handle)
 		 * we can switch to get_header_tar_gz/bz2/lzma().
 		 * Needs seekable fd. I wish recv(MSG_PEEK) works
 		 * on any fd... */
-#if ENABLE_FEATURE_TAR_GZIP
+#if ENABLE_FEATURE_SEAMLESS_GZ
 		if (tar.name[0] == 0x1f && tar.name[1] == (char)0x8b) { /* gzip */
 			get_header_ptr = get_header_tar_gz;
 		} else
 #endif
-#if ENABLE_FEATURE_TAR_BZIP2
+#if ENABLE_FEATURE_SEAMLESS_BZ2
 		if (tar.name[0] == 'B' && tar.name[1] == 'Z'
 		 && tar.name[2] == 'h' && isdigit(tar.name[3])
 		) { /* bzip2 */
diff --git a/archival/libunarchive/get_header_tar_bz2.c b/archival/libunarchive/get_header_tar_bz2.c
index 035c10b..615bbba 100644
--- a/archival/libunarchive/get_header_tar_bz2.c
+++ b/archival/libunarchive/get_header_tar_bz2.c
@@ -11,7 +11,7 @@ char FAST_FUNC get_header_tar_bz2(archive_handle_t *archive_handle)
 	/* Can't lseek over pipes */
 	archive_handle->seek = seek_by_read;
 
-	open_transformer(archive_handle->src_fd, unpack_bz2_stream, "bunzip2");
+	open_transformer(archive_handle->src_fd, unpack_bz2_stream_prime, "bunzip2");
 	archive_handle->offset = 0;
 	while (get_header_tar(archive_handle) == EXIT_SUCCESS)
 		continue;
diff --git a/archival/rpm.c b/archival/rpm.c
index e6dd3d8..e1f3c89 100644
--- a/archival/rpm.c
+++ b/archival/rpm.c
@@ -206,27 +206,27 @@ static void extract_cpio_gz(int fd)
 	archive_handle->src_fd = fd;
 	/*archive_handle->offset = 0; - init_handle() did it */
 
+// TODO: open_zipped does the same
+
 	xread(archive_handle->src_fd, &magic, 2);
 #if BB_MMU
 	xformer = unpack_gz_stream;
 #else
 	xformer_prog = "gunzip";
 #endif
-	if ((magic[0] != 0x1f) || (magic[1] != 0x8b)) {
-		if (ENABLE_FEATURE_RPM_BZ2
-		 && (magic[0] == 0x42) && (magic[1] == 0x5a)) {
+	if (magic[0] != 0x1f || magic[1] != 0x8b) {
+		if (!ENABLE_FEATURE_SEAMLESS_BZ2
+		 || magic[0] != 'B' || magic[1] != 'Z'
+		) {
+			bb_error_msg_and_die("no gzip"
+				USE_FEATURE_SEAMLESS_BZ2("/bzip2")
+				" magic");
+		}
 #if BB_MMU
-			xformer = unpack_bz2_stream;
+		xformer = unpack_bz2_stream;
 #else
-			xformer_prog = "bunzip2";
+		xformer_prog = "bunzip2";
 #endif
-	/* We can do better, need modifying unpack_bz2_stream to not require
-	 * first 2 bytes. Not very hard to do... I mean, TODO :) */
-			xlseek(archive_handle->src_fd, -2, SEEK_CUR);
-		} else
-			bb_error_msg_and_die("no gzip"
-				USE_FEATURE_RPM_BZ2("/bzip")
-				" magic");
 	} else {
 #if !BB_MMU
 		/* NOMMU version of open_transformer execs an external unzipper that should
diff --git a/archival/tar.c b/archival/tar.c
index b2481b8..45701c9 100644
--- a/archival/tar.c
+++ b/archival/tar.c
@@ -36,7 +36,7 @@
 #define block_buf bb_common_bufsiz1
 
 
-#if !ENABLE_FEATURE_TAR_GZIP && !ENABLE_FEATURE_TAR_BZIP2
+#if !ENABLE_FEATURE_SEAMLESS_GZ && !ENABLE_FEATURE_SEAMLESS_BZ2
 /* Do not pass gzip flag to writeTarFile() */
 #define writeTarFile(tar_fd, verboseFlag, dereferenceFlag, include, exclude, gzip) \
 	writeTarFile(tar_fd, verboseFlag, dereferenceFlag, include, exclude)
@@ -503,19 +503,19 @@ static int FAST_FUNC writeFileToTarball(const char *fileName, struct stat *statb
 	return TRUE;
 }
 
-#if ENABLE_FEATURE_TAR_GZIP || ENABLE_FEATURE_TAR_BZIP2
-#if !(ENABLE_FEATURE_TAR_GZIP && ENABLE_FEATURE_TAR_BZIP2)
+#if ENABLE_FEATURE_SEAMLESS_GZ || ENABLE_FEATURE_SEAMLESS_BZ2
+#if !(ENABLE_FEATURE_SEAMLESS_GZ && ENABLE_FEATURE_SEAMLESS_BZ2)
 #define vfork_compressor(tar_fd, gzip) vfork_compressor(tar_fd)
 #endif
 /* Don't inline: vfork scares gcc and pessimizes code */
 static void NOINLINE vfork_compressor(int tar_fd, int gzip)
 {
 	pid_t gzipPid;
-#if ENABLE_FEATURE_TAR_GZIP && ENABLE_FEATURE_TAR_BZIP2
+#if ENABLE_FEATURE_SEAMLESS_GZ && ENABLE_FEATURE_SEAMLESS_BZ2
 	const char *zip_exec = (gzip == 1) ? "gzip" : "bzip2";
-#elif ENABLE_FEATURE_TAR_GZIP
+#elif ENABLE_FEATURE_SEAMLESS_GZ
 	const char *zip_exec = "gzip";
-#else /* only ENABLE_FEATURE_TAR_BZIP2 */
+#else /* only ENABLE_FEATURE_SEAMLESS_BZ2 */
 	const char *zip_exec = "bzip2";
 #endif
 	// On Linux, vfork never unpauses parent early, although standard
@@ -579,7 +579,7 @@ static void NOINLINE vfork_compressor(int tar_fd, int gzip)
 		bb_perror_msg_and_die("cannot exec %s", zip_exec);
 	}
 }
-#endif /* ENABLE_FEATURE_TAR_GZIP || ENABLE_FEATURE_TAR_BZIP2 */
+#endif /* ENABLE_FEATURE_SEAMLESS_GZ || ENABLE_FEATURE_SEAMLESS_BZ2 */
 
 
 /* gcc 4.2.1 inlines it, making code bigger */
@@ -601,7 +601,7 @@ static NOINLINE int writeTarFile(int tar_fd, int verboseFlag,
 	if (fstat(tbInfo.tarFd, &tbInfo.statBuf) < 0)
 		bb_perror_msg_and_die("cannot stat tar file");
 
-#if ENABLE_FEATURE_TAR_GZIP || ENABLE_FEATURE_TAR_BZIP2
+#if ENABLE_FEATURE_SEAMLESS_GZ || ENABLE_FEATURE_SEAMLESS_BZ2
 	if (gzip)
 		vfork_compressor(tbInfo.tarFd, gzip);
 #endif
@@ -637,7 +637,7 @@ static NOINLINE int writeTarFile(int tar_fd, int verboseFlag,
 	if (errorFlag)
 		bb_error_msg("error exit delayed from previous errors");
 
-#if ENABLE_FEATURE_TAR_GZIP || ENABLE_FEATURE_TAR_BZIP2
+#if ENABLE_FEATURE_SEAMLESS_GZ || ENABLE_FEATURE_SEAMLESS_BZ2
 	if (gzip) {
 		int status;
 		if (safe_waitpid(-1, &status, 0) == -1)
@@ -679,7 +679,7 @@ static llist_t *append_file_list_to_list(llist_t *list)
 #define append_file_list_to_list(x) 0
 #endif
 
-#if ENABLE_FEATURE_TAR_COMPRESS
+#if ENABLE_FEATURE_SEAMLESS_Z
 static char FAST_FUNC get_header_tar_Z(archive_handle_t *archive_handle)
 {
 	/* Can't lseek over pipes */
@@ -692,7 +692,7 @@ static char FAST_FUNC get_header_tar_Z(archive_handle_t *archive_handle)
 		bb_error_msg_and_die("invalid magic");
 	}
 
-	open_transformer(archive_handle->src_fd, uncompress, "uncompress");
+	open_transformer(archive_handle->src_fd, unpack_Z_stream, "uncompress");
 	archive_handle->offset = 0;
 	while (get_header_tar(archive_handle) == EXIT_SUCCESS)
 		continue;
@@ -729,14 +729,14 @@ static void handle_SIGCHLD(int status)
 
 enum {
 	OPTBIT_KEEP_OLD = 7,
-	USE_FEATURE_TAR_CREATE(  OPTBIT_CREATE      ,)
-	USE_FEATURE_TAR_CREATE(  OPTBIT_DEREFERENCE ,)
-	USE_FEATURE_TAR_BZIP2(   OPTBIT_BZIP2       ,)
-	USE_FEATURE_TAR_LZMA(    OPTBIT_LZMA        ,)
-	USE_FEATURE_TAR_FROM(    OPTBIT_INCLUDE_FROM,)
-	USE_FEATURE_TAR_FROM(    OPTBIT_EXCLUDE_FROM,)
-	USE_FEATURE_TAR_GZIP(    OPTBIT_GZIP        ,)
-	USE_FEATURE_TAR_COMPRESS(OPTBIT_COMPRESS    ,)
+	USE_FEATURE_TAR_CREATE(   OPTBIT_CREATE      ,)
+	USE_FEATURE_TAR_CREATE(   OPTBIT_DEREFERENCE ,)
+	USE_FEATURE_SEAMLESS_BZ2( OPTBIT_BZIP2       ,)
+	USE_FEATURE_SEAMLESS_LZMA(OPTBIT_LZMA        ,)
+	USE_FEATURE_TAR_FROM(     OPTBIT_INCLUDE_FROM,)
+	USE_FEATURE_TAR_FROM(     OPTBIT_EXCLUDE_FROM,)
+	USE_FEATURE_SEAMLESS_GZ(  OPTBIT_GZIP        ,)
+	USE_FEATURE_SEAMLESS_Z(   OPTBIT_COMPRESS    ,)
 	OPTBIT_NOPRESERVE_OWN,
 	OPTBIT_NOPRESERVE_PERM,
 	OPT_TEST         = 1 << 0, // t
@@ -747,14 +747,14 @@ enum {
 	OPT_P            = 1 << 5, // p
 	OPT_VERBOSE      = 1 << 6, // v
 	OPT_KEEP_OLD     = 1 << 7, // k
-	OPT_CREATE       = USE_FEATURE_TAR_CREATE(  (1<<OPTBIT_CREATE      )) + 0, // c
-	OPT_DEREFERENCE  = USE_FEATURE_TAR_CREATE(  (1<<OPTBIT_DEREFERENCE )) + 0, // h
-	OPT_BZIP2        = USE_FEATURE_TAR_BZIP2(   (1<<OPTBIT_BZIP2       )) + 0, // j
-	OPT_LZMA         = USE_FEATURE_TAR_LZMA(    (1<<OPTBIT_LZMA        )) + 0, // a
-	OPT_INCLUDE_FROM = USE_FEATURE_TAR_FROM(    (1<<OPTBIT_INCLUDE_FROM)) + 0, // T
-	OPT_EXCLUDE_FROM = USE_FEATURE_TAR_FROM(    (1<<OPTBIT_EXCLUDE_FROM)) + 0, // X
-	OPT_GZIP         = USE_FEATURE_TAR_GZIP(    (1<<OPTBIT_GZIP        )) + 0, // z
-	OPT_COMPRESS     = USE_FEATURE_TAR_COMPRESS((1<<OPTBIT_COMPRESS    )) + 0, // Z
+	OPT_CREATE       = USE_FEATURE_TAR_CREATE(   (1 << OPTBIT_CREATE      )) + 0, // c
+	OPT_DEREFERENCE  = USE_FEATURE_TAR_CREATE(   (1 << OPTBIT_DEREFERENCE )) + 0, // h
+	OPT_BZIP2        = USE_FEATURE_SEAMLESS_BZ2( (1 << OPTBIT_BZIP2       )) + 0, // j
+	OPT_LZMA         = USE_FEATURE_SEAMLESS_LZMA((1 << OPTBIT_LZMA        )) + 0, // a
+	OPT_INCLUDE_FROM = USE_FEATURE_TAR_FROM(     (1 << OPTBIT_INCLUDE_FROM)) + 0, // T
+	OPT_EXCLUDE_FROM = USE_FEATURE_TAR_FROM(     (1 << OPTBIT_EXCLUDE_FROM)) + 0, // X
+	OPT_GZIP         = USE_FEATURE_SEAMLESS_GZ(  (1 << OPTBIT_GZIP        )) + 0, // z
+	OPT_COMPRESS     = USE_FEATURE_SEAMLESS_Z(   (1 << OPTBIT_COMPRESS    )) + 0, // Z
 	OPT_NOPRESERVE_OWN  = 1 << OPTBIT_NOPRESERVE_OWN , // no-same-owner
 	OPT_NOPRESERVE_PERM = 1 << OPTBIT_NOPRESERVE_PERM, // no-same-permissions
 };
@@ -772,20 +772,20 @@ static const char tar_longopts[] ALIGN1 =
 	"create\0"              No_argument       "c"
 	"dereference\0"         No_argument       "h"
 # endif
-# if ENABLE_FEATURE_TAR_BZIP2
+# if ENABLE_FEATURE_SEAMLESS_BZ2
 	"bzip2\0"               No_argument       "j"
 # endif
-# if ENABLE_FEATURE_TAR_LZMA
+# if ENABLE_FEATURE_SEAMLESS_LZMA
 	"lzma\0"                No_argument       "a"
 # endif
 # if ENABLE_FEATURE_TAR_FROM
 	"files-from\0"          Required_argument "T"
 	"exclude-from\0"        Required_argument "X"
 # endif
-# if ENABLE_FEATURE_TAR_GZIP
+# if ENABLE_FEATURE_SEAMLESS_GZ
 	"gzip\0"                No_argument       "z"
 # endif
-# if ENABLE_FEATURE_TAR_COMPRESS
+# if ENABLE_FEATURE_SEAMLESS_Z
 	"compress\0"            No_argument       "Z"
 # endif
 	"no-same-owner\0"       No_argument       "\xfd"
@@ -834,12 +834,12 @@ int tar_main(int argc UNUSED_PARAM, char **argv)
 #endif
 	opt = getopt32(argv,
 		"txC:f:Opvk"
-		USE_FEATURE_TAR_CREATE(  "ch"  )
-		USE_FEATURE_TAR_BZIP2(   "j"   )
-		USE_FEATURE_TAR_LZMA(    "a"   )
-		USE_FEATURE_TAR_FROM(    "T:X:")
-		USE_FEATURE_TAR_GZIP(    "z"   )
-		USE_FEATURE_TAR_COMPRESS("Z"   )
+		USE_FEATURE_TAR_CREATE(   "ch"  )
+		USE_FEATURE_SEAMLESS_BZ2( "j"   )
+		USE_FEATURE_SEAMLESS_LZMA("a"   )
+		USE_FEATURE_TAR_FROM(     "T:X:")
+		USE_FEATURE_SEAMLESS_GZ(  "z"   )
+		USE_FEATURE_SEAMLESS_Z(   "Z"   )
 		, &base_dir // -C dir
 		, &tar_filename // -f filename
 		USE_FEATURE_TAR_FROM(, &(tar_handle->accept)) // T
@@ -922,8 +922,7 @@ int tar_main(int argc UNUSED_PARAM, char **argv)
 
 			tar_stream = stdout;
 			/* Mimicking GNU tar 1.15.1: */
-			flags = O_WRONLY|O_CREAT|O_TRUNC;
-		/* was doing unlink; open(O_WRONLY|O_CREAT|O_EXCL); why? */
+			flags = O_WRONLY | O_CREAT | O_TRUNC;
 		} else {
 			tar_stream = stdin;
 			flags = O_RDONLY;
@@ -933,7 +932,14 @@ int tar_main(int argc UNUSED_PARAM, char **argv)
 			tar_handle->src_fd = fileno(tar_stream);
 			tar_handle->seek = seek_by_read;
 		} else {
-			tar_handle->src_fd = xopen(tar_filename, flags);
+			if (ENABLE_FEATURE_TAR_AUTODETECT && flags == O_RDONLY) {
+				get_header_ptr = get_header_tar;
+				tar_handle->src_fd = open_zipped(tar_filename);
+				if (tar_handle->src_fd < 0)
+					bb_perror_msg_and_die("can't open '%s'", tar_filename);
+			} else {
+				tar_handle->src_fd = xopen(tar_filename, flags);
+			}
 		}
 	}
 
@@ -947,11 +953,11 @@ int tar_main(int argc UNUSED_PARAM, char **argv)
 
 	/* create an archive */
 	if (opt & OPT_CREATE) {
-#if ENABLE_FEATURE_TAR_GZIP || ENABLE_FEATURE_TAR_BZIP2
+#if ENABLE_FEATURE_SEAMLESS_GZ || ENABLE_FEATURE_SEAMLESS_BZ2
 		int zipMode = 0;
-		if (ENABLE_FEATURE_TAR_GZIP && (opt & OPT_GZIP))
+		if (ENABLE_FEATURE_SEAMLESS_GZ && (opt & OPT_GZIP))
 			zipMode = 1;
-		if (ENABLE_FEATURE_TAR_BZIP2 && (opt & OPT_BZIP2))
+		if (ENABLE_FEATURE_SEAMLESS_BZ2 && (opt & OPT_BZIP2))
 			zipMode = 2;
 #endif
 		/* NB: writeTarFile() closes tar_handle->src_fd */
diff --git a/include/libbb.h b/include/libbb.h
index 9cbab4f..3996846 100644
--- a/include/libbb.h
+++ b/include/libbb.h
@@ -597,6 +597,7 @@ extern void *xmalloc_read(int fd, size_t *maxsz_p) FAST_FUNC;
 /* Returns NULL if file can't be opened */
 extern void *xmalloc_open_read_close(const char *filename, size_t *maxsz_p) FAST_FUNC;
 /* Autodetects .gz etc */
+extern int open_zipped(const char *fname) FAST_FUNC;
 extern void *xmalloc_open_zipped_read_close(const char *fname, size_t *maxsz_p) FAST_FUNC;
 /* Never returns NULL */
 extern void *xmalloc_xopen_read_close(const char *filename, size_t *maxsz_p) FAST_FUNC;
@@ -1039,10 +1040,6 @@ const char *bb_basename(const char *name) FAST_FUNC;
 char *last_char_is(const char *s, int c) FAST_FUNC;
 
 
-USE_DESKTOP(long long) int uncompress(int fd_in, int fd_out) FAST_FUNC;
-int inflate(int in, int out) FAST_FUNC;
-
-
 int bb_make_directory(char *path, long mode, int flags) FAST_FUNC;
 
 int get_signum(const char *name) FAST_FUNC;
diff --git a/include/unarchive.h b/include/unarchive.h
index cf23d98..7ff791b 100644
--- a/include/unarchive.h
+++ b/include/unarchive.h
@@ -98,9 +98,9 @@ extern void header_verbose_list(const file_header_t *file_header) FAST_FUNC;
 extern char get_header_ar(archive_handle_t *archive_handle) FAST_FUNC;
 extern char get_header_cpio(archive_handle_t *archive_handle) FAST_FUNC;
 extern char get_header_tar(archive_handle_t *archive_handle) FAST_FUNC;
+extern char get_header_tar_gz(archive_handle_t *archive_handle) FAST_FUNC;
 extern char get_header_tar_bz2(archive_handle_t *archive_handle) FAST_FUNC;
 extern char get_header_tar_lzma(archive_handle_t *archive_handle) FAST_FUNC;
-extern char get_header_tar_gz(archive_handle_t *archive_handle) FAST_FUNC;
 
 extern void seek_by_jump(const archive_handle_t *archive_handle, unsigned amount) FAST_FUNC;
 extern void seek_by_read(const archive_handle_t *archive_handle, unsigned amount) FAST_FUNC;
@@ -120,17 +120,22 @@ typedef struct inflate_unzip_result {
 	uint32_t crc;
 } inflate_unzip_result;
 
-extern USE_DESKTOP(long long) int unpack_bz2_stream(int src_fd, int dst_fd) FAST_FUNC;
-extern USE_DESKTOP(long long) int inflate_unzip(inflate_unzip_result *res, off_t compr_size, int src_fd, int dst_fd) FAST_FUNC;
-extern USE_DESKTOP(long long) int unpack_gz_stream(int src_fd, int dst_fd) FAST_FUNC;
-extern USE_DESKTOP(long long) int unpack_lzma_stream(int src_fd, int dst_fd) FAST_FUNC;
+USE_DESKTOP(long long) int inflate_unzip(inflate_unzip_result *res, off_t compr_size, int src_fd, int dst_fd) FAST_FUNC;
+/* lzma unpacker takes .lzma stream from offset 0 */
+USE_DESKTOP(long long) int unpack_lzma_stream(int src_fd, int dst_fd) FAST_FUNC;
+/* the rest wants 2 first bytes already skipped by the caller */
+USE_DESKTOP(long long) int unpack_bz2_stream(int src_fd, int dst_fd) FAST_FUNC;
+USE_DESKTOP(long long) int unpack_gz_stream(int src_fd, int dst_fd) FAST_FUNC;
+USE_DESKTOP(long long) int unpack_Z_stream(int fd_in, int fd_out) FAST_FUNC;
+/* wrapper which checks first two bytes to be "BZ" */
+USE_DESKTOP(long long) int unpack_bz2_stream_prime(int src_fd, int dst_fd) FAST_FUNC;
 
 #if BB_MMU
-extern void open_transformer(int fd,
+void open_transformer(int fd,
 	USE_DESKTOP(long long) int FAST_FUNC (*transformer)(int src_fd, int dst_fd)) FAST_FUNC;
 #define open_transformer(fd, transformer, transform_prog) open_transformer(fd, transformer)
 #else
-extern void open_transformer(int src_fd, const char *transform_prog) FAST_FUNC;
+void open_transformer(int src_fd, const char *transform_prog) FAST_FUNC;
 #define open_transformer(fd, transformer, transform_prog) open_transformer(fd, transform_prog)
 #endif
 
diff --git a/include/usage.h b/include/usage.h
index ae6d2bc..78f4036 100644
--- a/include/usage.h
+++ b/include/usage.h
@@ -3943,9 +3943,9 @@
        "nameserver 10.0.0.1\n"
 
 #define tar_trivial_usage \
-       "-[" USE_FEATURE_TAR_CREATE("c") USE_FEATURE_TAR_GZIP("z") \
-	USE_FEATURE_TAR_BZIP2("j") USE_FEATURE_TAR_LZMA("a") \
-	USE_FEATURE_TAR_COMPRESS("Z") "xtvO] " \
+       "-[" USE_FEATURE_TAR_CREATE("c") USE_FEATURE_SEAMLESS_GZ("z") \
+	USE_FEATURE_SEAMLESS_BZ2("j") USE_FEATURE_SEAMLESS_LZMA("a") \
+	USE_FEATURE_SEAMLESS_Z("Z") "xtvO] " \
 	USE_FEATURE_TAR_FROM("[-X FILE] ") \
        "[-f TARFILE] [-C DIR] [FILE(s)]..."
 #define tar_full_usage "\n\n" \
@@ -3956,16 +3956,16 @@
      "\n	x	Extract" \
      "\n	t	List" \
      "\nArchive format selection:" \
-	USE_FEATURE_TAR_GZIP( \
+	USE_FEATURE_SEAMLESS_GZ( \
      "\n	z	Filter the archive through gzip" \
 	) \
-	USE_FEATURE_TAR_BZIP2( \
+	USE_FEATURE_SEAMLESS_BZ2( \
      "\n	j	Filter the archive through bzip2" \
 	) \
-	USE_FEATURE_TAR_LZMA( \
+	USE_FEATURE_SEAMLESS_LZMA( \
      "\n	a	Filter the archive through lzma" \
 	) \
-	USE_FEATURE_TAR_COMPRESS( \
+	USE_FEATURE_SEAMLESS_Z( \
      "\n	Z	Filter the archive through compress" \
 	) \
      "\nFile selection:" \
diff --git a/libbb/appletlib.c b/libbb/appletlib.c
index beb1d6f..2bab0eb 100644
--- a/libbb/appletlib.c
+++ b/libbb/appletlib.c
@@ -73,7 +73,8 @@ static const char *unpack_usage_messages(void)
 
 	i = start_bunzip(&bd,
 			/* src_fd: */ -1,
-			/* inbuf:  */ (void *)packed_usage,
+//FIXME: can avoid storing these 2 bytes!
+			/* inbuf:  */ (void *)packed_usage + 2,
 			/* len:    */ sizeof(packed_usage));
 	/* read_bunzip can longjmp to start_bunzip, and ultimately
 	 * end up here with i != 0 on read data errors! Not trivial */
diff --git a/libbb/read.c b/libbb/read.c
index 18f6283..9f6bfcd 100644
--- a/libbb/read.c
+++ b/libbb/read.c
@@ -8,7 +8,14 @@
  */
 
 #include "libbb.h"
-#if ENABLE_FEATURE_MODPROBE_SMALL_ZIPPED
+
+#define ZIPPED (ENABLE_FEATURE_SEAMLESS_LZMA \
+	|| ENABLE_FEATURE_SEAMLESS_BZ2 \
+	|| ENABLE_FEATURE_SEAMLESS_GZ \
+	/* || ENABLE_FEATURE_SEAMLESS_Z */ \
+)
+
+#if ZIPPED
 #include "unarchive.h"
 #endif
 
@@ -299,24 +306,81 @@ void* FAST_FUNC xmalloc_xopen_read_close(const char *filename, size_t *maxsz_p)
 	return buf;
 }
 
-#if ENABLE_FEATURE_MODPROBE_SMALL_ZIPPED
+int FAST_FUNC open_zipped(const char *fname)
+{
+#if !ZIPPED
+	return open(fname, O_RDONLY);
+#else
+	unsigned char magic[2];
+	char *sfx;
+	int fd;
+#if BB_MMU
+	USE_DESKTOP(long long) int FAST_FUNC (*xformer)(int src_fd, int dst_fd);
+	enum { xformer_prog = 0 };
+#else
+	enum { xformer = 0 };
+	const char *xformer_prog;
+#endif
+
+	fd = open(fname, O_RDONLY);
+	if (fd < 0)
+		return fd;
+
+	sfx = strrchr(fname, '.');
+	if (sfx) {
+		if (ENABLE_FEATURE_SEAMLESS_LZMA && strcmp(sfx, ".lzma") == 0)
+			/* .lzma has no header/signature, just trust it */
+			open_transformer(fd, unpack_lzma_stream, "unlzma");
+		else
+		if ((ENABLE_FEATURE_SEAMLESS_GZ && strcmp(sfx, ".gz") == 0)
+		 || (ENABLE_FEATURE_SEAMLESS_BZ2 && strcmp(sfx, ".bz2") == 0)
+		) {
+			/* .gz and .bz2 both have 2-byte signature, and their
+			 * unpack_XXX_stream want this header skipped. */
+			xread(fd, &magic, 2);
+#if BB_MMU
+			xformer = unpack_gz_stream;
+#else
+			xformer_prog = "gunzip";
+#endif
+			if (magic[0] != 0x1f || magic[1] != 0x8b) {
+				if (!ENABLE_FEATURE_SEAMLESS_BZ2
+				 || magic[0] != 'B' || magic[1] != 'Z'
+				) {
+					bb_error_msg_and_die("no gzip"
+						USE_FEATURE_SEAMLESS_BZ2("/bzip2")
+						" magic");
+				}
+#if BB_MMU
+				xformer = unpack_bz2_stream;
+#else
+				xformer_prog = "bunzip2";
+#endif
+			} else {
+#if !BB_MMU
+				/* NOMMU version of open_transformer execs
+				 * an external unzipper that wants
+				 * file position at the start of the file */
+				xlseek(fd, 0, SEEK_SET);
+#endif
+			}
+			open_transformer(fd, xformer, xformer_prog);
+		}
+	}
+
+	return fd;
+#endif
+}
+
 void* FAST_FUNC xmalloc_open_zipped_read_close(const char *fname, size_t *maxsz_p)
 {
+	int fd;
 	char *image;
-	char *suffix;
 
-	int fd = open(fname, O_RDONLY);
+	fd = open_zipped(fname);
 	if (fd < 0)
 		return NULL;
 
-	suffix = strrchr(fname, '.');
-	if (suffix) {
-		if (strcmp(suffix, ".gz") == 0)
-			open_transformer(fd, unpack_gz_stream, "gunzip");
-		else if (strcmp(suffix, ".bz2") == 0)
-			open_transformer(fd, unpack_bz2_stream, "bunzip2");
-	}
-
 	image = xmalloc_read(fd, maxsz_p);
 	if (!image)
 		bb_perror_msg("read error from '%s'", fname);
@@ -324,4 +388,3 @@ void* FAST_FUNC xmalloc_open_zipped_read_close(const char *fname, size_t *maxsz_
 
 	return image;
 }
-#endif
diff --git a/modutils/Config.in b/modutils/Config.in
index f76a082..a430fca 100644
--- a/modutils/Config.in
+++ b/modutils/Config.in
@@ -54,13 +54,6 @@ config FEATURE_MODPROBE_SMALL_CHECK_ALREADY_LOADED
 	  Check if the module is already loaded.
 	  N.B. It's racy.
 
-config FEATURE_MODPROBE_SMALL_ZIPPED
-	bool "Handle gzipped or bzipped modules"
-	default n
-	depends on MODPROBE_SMALL
-	help
-	  Handle compressed modules. Bloaty. Sloooow.
-
 config DEPMOD
 	bool "depmod"
 	default n
diff --git a/modutils/modprobe-small.c b/modutils/modprobe-small.c
index ea130b8..ac08ba7 100644
--- a/modutils/modprobe-small.c
+++ b/modutils/modprobe-small.c
@@ -100,7 +100,7 @@ static char* find_keyword(char *ptr, size_t len, const char *word)
 {
 	int wlen;
 
-	if (!ptr) /* happens if read_module cannot read it */
+	if (!ptr) /* happens if xmalloc_open_zipped_read_close cannot read it */
 		return NULL;
 
 	wlen = strlen(word);
@@ -141,12 +141,6 @@ static char* str_2_list(const char *str)
 	return dst;
 }
 
-#if ENABLE_FEATURE_MODPROBE_SMALL_ZIPPED
-# define read_module xmalloc_open_zipped_read_close
-#else
-# define read_module xmalloc_open_read_close
-#endif
-
 /* We use error numbers in a loose translation... */
 static const char *moderror(int err)
 {
@@ -173,7 +167,7 @@ static int load_module(const char *fname, const char *options)
 	char *module_image;
 	dbg1_error_msg("load_module('%s','%s')", fname, options);
 
-	module_image = read_module(fname, &len);
+	module_image = xmalloc_open_zipped_read_close(fname, &len);
 	r = (!module_image || init_module(module_image, len, options ? options : "") != 0);
 	free(module_image);
 	dbg1_error_msg("load_module:%d", r);
@@ -195,7 +189,7 @@ static void parse_module(module_info *info, const char *pathname)
 
 	/* Read (possibly compressed) module */
 	len = 64 * 1024 * 1024; /* 64 Mb at most */
-	module_image = read_module(pathname, &len);
+	module_image = xmalloc_open_zipped_read_close(pathname, &len);
 //TODO: optimize redundant module body reads
 
 	/* "alias1 symbol:sym1 alias2 symbol:sym2" */
diff --git a/scripts/defconfig b/scripts/defconfig
index 2948016..404c50d 100644
--- a/scripts/defconfig
+++ b/scripts/defconfig
@@ -1,7 +1,7 @@
 #
 # Automatically generated make config: don't edit
-# Busybox version: 1.11.0.svn
-# Wed Jun 25 12:56:32 2008
+# Busybox version: 1.12.0.svn
+# Tue Aug  5 14:44:22 2008
 #
 CONFIG_HAVE_DOT_CONFIG=y
 
@@ -57,6 +57,7 @@ CONFIG_NO_DEBUG_LIB=y
 # CONFIG_DMALLOC is not set
 # CONFIG_EFENCE is not set
 CONFIG_INCLUDE_SUSv2=y
+# CONFIG_PARSE is not set
 
 #
 # Installation Options
@@ -99,6 +100,10 @@ CONFIG_FEATURE_HWIB=y
 #
 # Archival Utilities
 #
+CONFIG_FEATURE_SEAMLESS_LZMA=y
+CONFIG_FEATURE_SEAMLESS_BZ2=y
+CONFIG_FEATURE_SEAMLESS_GZ=y
+CONFIG_FEATURE_SEAMLESS_Z=y
 CONFIG_AR=y
 CONFIG_FEATURE_AR_LONG_FILENAMES=y
 CONFIG_BUNZIP2=y
@@ -109,17 +114,11 @@ CONFIG_FEATURE_CPIO_O=y
 # CONFIG_DPKG_DEB is not set
 # CONFIG_FEATURE_DPKG_DEB_EXTRACT_ONLY is not set
 CONFIG_GUNZIP=y
-CONFIG_FEATURE_GUNZIP_UNCOMPRESS=y
 CONFIG_GZIP=y
 CONFIG_RPM2CPIO=y
 CONFIG_RPM=y
-CONFIG_FEATURE_RPM_BZ2=y
 CONFIG_TAR=y
 CONFIG_FEATURE_TAR_CREATE=y
-CONFIG_FEATURE_TAR_GZIP=y
-CONFIG_FEATURE_TAR_BZIP2=y
-CONFIG_FEATURE_TAR_LZMA=y
-CONFIG_FEATURE_TAR_COMPRESS=y
 CONFIG_FEATURE_TAR_AUTODETECT=y
 CONFIG_FEATURE_TAR_FROM=y
 CONFIG_FEATURE_TAR_OLDGNU_COMPATIBILITY=y
@@ -133,13 +132,6 @@ CONFIG_FEATURE_LZMA_FAST=y
 CONFIG_UNZIP=y
 
 #
-# Common options for cpio and tar
-#
-# CONFIG_FEATURE_DEB_TAR_GZ is not set
-# CONFIG_FEATURE_DEB_TAR_BZ2 is not set
-# CONFIG_FEATURE_DEB_TAR_LZMA is not set
-
-#
 # Coreutils
 #
 CONFIG_BASENAME=y
@@ -217,6 +209,7 @@ CONFIG_SEQ=y
 CONFIG_SHA1SUM=y
 CONFIG_SLEEP=y
 CONFIG_FEATURE_FANCY_SLEEP=y
+CONFIG_FEATURE_FLOAT_SLEEP=y
 CONFIG_SORT=y
 CONFIG_FEATURE_SORT_BIG=y
 CONFIG_SPLIT=y
@@ -426,29 +419,28 @@ CONFIG_LSATTR=y
 #
 # Linux Module Utilities
 #
-CONFIG_DEPMOD=y
-CONFIG_FEATURE_DEPMOD_PRUNE_FANCY=y
-CONFIG_FEATURE_DEPMOD_ALIAS=y
-CONFIG_INSMOD=y
-CONFIG_FEATURE_INSMOD_VERSION_CHECKING=y
-CONFIG_FEATURE_INSMOD_KSYMOOPS_SYMBOLS=y
-CONFIG_FEATURE_INSMOD_LOADINKMEM=y
-CONFIG_FEATURE_INSMOD_LOAD_MAP=y
-CONFIG_FEATURE_INSMOD_LOAD_MAP_FULL=y
-CONFIG_RMMOD=y
-CONFIG_LSMOD=y
-CONFIG_FEATURE_LSMOD_PRETTY_2_6_OUTPUT=y
-CONFIG_MODPROBE=y
-CONFIG_FEATURE_MODPROBE_MULTIPLE_OPTIONS=y
-CONFIG_FEATURE_MODPROBE_FANCY_ALIAS=y
-CONFIG_FEATURE_MODPROBE_BLACKLIST=y
-
-#
-# Options common to multiple modutils
-#
-CONFIG_FEATURE_CHECK_TAINTED_MODULE=y
-CONFIG_FEATURE_2_4_MODULES=y
-CONFIG_FEATURE_2_6_MODULES=y
+CONFIG_MODPROBE_SMALL=y
+CONFIG_FEATURE_MODPROBE_SMALL_OPTIONS_ON_CMDLINE=y
+CONFIG_FEATURE_MODPROBE_SMALL_CHECK_ALREADY_LOADED=y
+# CONFIG_DEPMOD is not set
+# CONFIG_FEATURE_DEPMOD_PRUNE_FANCY is not set
+# CONFIG_FEATURE_DEPMOD_ALIAS is not set
+# CONFIG_INSMOD is not set
+# CONFIG_FEATURE_INSMOD_VERSION_CHECKING is not set
+# CONFIG_FEATURE_INSMOD_KSYMOOPS_SYMBOLS is not set
+# CONFIG_FEATURE_INSMOD_LOADINKMEM is not set
+# CONFIG_FEATURE_INSMOD_LOAD_MAP is not set
+# CONFIG_FEATURE_INSMOD_LOAD_MAP_FULL is not set
+# CONFIG_RMMOD is not set
+# CONFIG_LSMOD is not set
+# CONFIG_FEATURE_LSMOD_PRETTY_2_6_OUTPUT is not set
+# CONFIG_MODPROBE is not set
+# CONFIG_FEATURE_MODPROBE_MULTIPLE_OPTIONS is not set
+# CONFIG_FEATURE_MODPROBE_FANCY_ALIAS is not set
+# CONFIG_FEATURE_MODPROBE_BLACKLIST is not set
+# CONFIG_FEATURE_CHECK_TAINTED_MODULE is not set
+# CONFIG_FEATURE_2_4_MODULES is not set
+# CONFIG_FEATURE_2_6_MODULES is not set
 CONFIG_DEFAULT_MODULES_DIR="/lib/modules"
 CONFIG_DEFAULT_DEPMOD_FILE="modules.dep"
 # CONFIG_FEATURE_QUERY_MODULE_INTERFACE is not set
@@ -686,6 +678,7 @@ CONFIG_NC_SERVER=y
 CONFIG_NC_EXTRA=y
 CONFIG_NETSTAT=y
 CONFIG_FEATURE_NETSTAT_WIDE=y
+CONFIG_FEATURE_NETSTAT_PRG=y
 CONFIG_NSLOOKUP=y
 CONFIG_PING=y
 CONFIG_PING6=y
@@ -794,6 +787,7 @@ CONFIG_ASH_RANDOM_SUPPORT=y
 # CONFIG_HUSH_TICK is not set
 # CONFIG_HUSH_IF is not set
 # CONFIG_HUSH_LOOPS is not set
+# CONFIG_HUSH_CASE is not set
 # CONFIG_LASH is not set
 # CONFIG_MSH is not set