diff --git a/archival/bbunzip.c b/archival/bbunzip.c
index fce5ab9e1..84f58f138 100644
--- a/archival/bbunzip.c
+++ b/archival/bbunzip.c
@@ -39,7 +39,7 @@ char* FAST_FUNC append_ext(char *filename, const char *expected_ext)
 }
 
 int FAST_FUNC bbunpack(char **argv,
-	IF_DESKTOP(long long) int FAST_FUNC (*unpacker)(transformer_aux_data_t *aux),
+	IF_DESKTOP(long long) int FAST_FUNC (*unpacker)(transformer_state_t *xstate),
 	char* FAST_FUNC (*make_new_name)(char *filename, const char *expected_ext),
 	const char *expected_ext
 )
@@ -48,7 +48,7 @@ int FAST_FUNC bbunpack(char **argv,
 	IF_DESKTOP(long long) int status = 0;
 	char *filename, *new_name;
 	smallint exitcode = 0;
-	transformer_aux_data_t aux;
+	transformer_state_t xstate;
 
 	do {
 		/* NB: new_name is *maybe* malloc'ed! */
@@ -120,9 +120,9 @@ int FAST_FUNC bbunpack(char **argv,
 		}
 
 		if (!(option_mask32 & SEAMLESS_MAGIC)) {
-			init_transformer_aux_data(&aux);
-			aux.check_signature = 1;
-			status = unpacker(&aux);
+			init_transformer_state(&xstate);
+			xstate.check_signature = 1;
+			status = unpacker(&xstate);
 			if (status < 0)
 				exitcode = 1;
 		} else {
@@ -141,10 +141,10 @@ int FAST_FUNC bbunpack(char **argv,
 				unsigned new_name_len;
 
 				/* TODO: restore other things? */
-				if (aux.mtime != 0) {
+				if (xstate.mtime != 0) {
 					struct timeval times[2];
 
-					times[1].tv_sec = times[0].tv_sec = aux.mtime;
+					times[1].tv_sec = times[0].tv_sec = xstate.mtime;
 					times[1].tv_usec = times[0].tv_usec = 0;
 					/* Note: we closed it first.
 					 * On some systems calling utimes
@@ -227,9 +227,9 @@ char* FAST_FUNC make_new_name_generic(char *filename, const char *expected_ext)
 //kbuild:lib-$(CONFIG_UNCOMPRESS) += bbunzip.o
 #if ENABLE_UNCOMPRESS
 static
-IF_DESKTOP(long long) int FAST_FUNC unpack_uncompress(transformer_aux_data_t *aux)
+IF_DESKTOP(long long) int FAST_FUNC unpack_uncompress(transformer_state_t *xstate)
 {
-	return unpack_Z_stream(aux, STDIN_FILENO, STDOUT_FILENO);
+	return unpack_Z_stream(xstate, STDIN_FILENO, STDOUT_FILENO);
 }
 int uncompress_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 int uncompress_main(int argc UNUSED_PARAM, char **argv)
@@ -325,9 +325,9 @@ char* FAST_FUNC make_new_name_gunzip(char *filename, const char *expected_ext UN
 	return filename;
 }
 static
-IF_DESKTOP(long long) int FAST_FUNC unpack_gunzip(transformer_aux_data_t *aux)
+IF_DESKTOP(long long) int FAST_FUNC unpack_gunzip(transformer_state_t *xstate)
 {
-	return unpack_gz_stream(aux, STDIN_FILENO, STDOUT_FILENO);
+	return unpack_gz_stream(xstate, STDIN_FILENO, STDOUT_FILENO);
 }
 /*
  * Linux kernel build uses gzip -d -n. We accept and ignore it.
@@ -396,9 +396,9 @@ int gunzip_main(int argc UNUSED_PARAM, char **argv)
 //kbuild:lib-$(CONFIG_BUNZIP2) += bbunzip.o
 #if ENABLE_BUNZIP2
 static
-IF_DESKTOP(long long) int FAST_FUNC unpack_bunzip2(transformer_aux_data_t *aux)
+IF_DESKTOP(long long) int FAST_FUNC unpack_bunzip2(transformer_state_t *xstate)
 {
-	return unpack_bz2_stream(aux, STDIN_FILENO, STDOUT_FILENO);
+	return unpack_bz2_stream(xstate, STDIN_FILENO, STDOUT_FILENO);
 }
 int bunzip2_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 int bunzip2_main(int argc UNUSED_PARAM, char **argv)
@@ -495,9 +495,9 @@ int bunzip2_main(int argc UNUSED_PARAM, char **argv)
 //kbuild:lib-$(CONFIG_UNLZMA) += bbunzip.o
 #if ENABLE_UNLZMA
 static
-IF_DESKTOP(long long) int FAST_FUNC unpack_unlzma(transformer_aux_data_t *aux)
+IF_DESKTOP(long long) int FAST_FUNC unpack_unlzma(transformer_state_t *xstate)
 {
-	return unpack_lzma_stream(aux, STDIN_FILENO, STDOUT_FILENO);
+	return unpack_lzma_stream(xstate, STDIN_FILENO, STDOUT_FILENO);
 }
 int unlzma_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 int unlzma_main(int argc UNUSED_PARAM, char **argv)
@@ -538,9 +538,9 @@ int unlzma_main(int argc UNUSED_PARAM, char **argv)
 //kbuild:lib-$(CONFIG_UNXZ) += bbunzip.o
 #if ENABLE_UNXZ
 static
-IF_DESKTOP(long long) int FAST_FUNC unpack_unxz(transformer_aux_data_t *aux)
+IF_DESKTOP(long long) int FAST_FUNC unpack_unxz(transformer_state_t *xstate)
 {
-	return unpack_xz_stream(aux, STDIN_FILENO, STDOUT_FILENO);
+	return unpack_xz_stream(xstate, STDIN_FILENO, STDOUT_FILENO);
 }
 int unxz_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 int unxz_main(int argc UNUSED_PARAM, char **argv)
diff --git a/archival/bzip2.c b/archival/bzip2.c
index f7718b411..47fa29af3 100644
--- a/archival/bzip2.c
+++ b/archival/bzip2.c
@@ -127,7 +127,7 @@ IF_DESKTOP(long long) int bz_write(bz_stream *strm, void* rbuf, ssize_t rlen, vo
 }
 
 static
-IF_DESKTOP(long long) int FAST_FUNC compressStream(transformer_aux_data_t *aux UNUSED_PARAM)
+IF_DESKTOP(long long) int FAST_FUNC compressStream(transformer_state_t *xstate UNUSED_PARAM)
 {
 	IF_DESKTOP(long long) int total;
 	ssize_t count;
diff --git a/archival/gzip.c b/archival/gzip.c
index 1e779c9c3..a93d2175a 100644
--- a/archival/gzip.c
+++ b/archival/gzip.c
@@ -2042,7 +2042,7 @@ static void zip(ulg time_stamp)
 
 /* ======================================================================== */
 static
-IF_DESKTOP(long long) int FAST_FUNC pack_gzip(transformer_aux_data_t *aux UNUSED_PARAM)
+IF_DESKTOP(long long) int FAST_FUNC pack_gzip(transformer_state_t *xstate UNUSED_PARAM)
 {
 	struct stat s;
 
diff --git a/archival/libarchive/decompress_bunzip2.c b/archival/libarchive/decompress_bunzip2.c
index 6396fe40d..36237e221 100644
--- a/archival/libarchive/decompress_bunzip2.c
+++ b/archival/libarchive/decompress_bunzip2.c
@@ -731,7 +731,7 @@ void FAST_FUNC dealloc_bunzip(bunzip_data *bd)
 
 /* Decompress src_fd to dst_fd.  Stops at end of bzip data, not end of file. */
 IF_DESKTOP(long long) int FAST_FUNC
-unpack_bz2_stream(transformer_aux_data_t *aux, int src_fd, int dst_fd)
+unpack_bz2_stream(transformer_state_t *xstate, int src_fd, int dst_fd)
 {
 	IF_DESKTOP(long long total_written = 0;)
 	bunzip_data *bd;
@@ -739,7 +739,7 @@ unpack_bz2_stream(transformer_aux_data_t *aux, int src_fd, int dst_fd)
 	int i;
 	unsigned len;
 
-	if (check_signature16(aux, src_fd, BZIP2_MAGIC))
+	if (check_signature16(xstate, src_fd, BZIP2_MAGIC))
 		return -1;
 
 	outbuf = xmalloc(IOBUF_SIZE);
diff --git a/archival/libarchive/decompress_gunzip.c b/archival/libarchive/decompress_gunzip.c
index 7c6f38ec3..62a3d78b6 100644
--- a/archival/libarchive/decompress_gunzip.c
+++ b/archival/libarchive/decompress_gunzip.c
@@ -1034,22 +1034,22 @@ inflate_unzip_internal(STATE_PARAM int in, int out)
 /* For unzip */
 
 IF_DESKTOP(long long) int FAST_FUNC
-inflate_unzip(transformer_aux_data_t *aux, int in, int out)
+inflate_unzip(transformer_state_t *xstate, int in, int out)
 {
 	IF_DESKTOP(long long) int n;
 	DECLARE_STATE;
 
 	ALLOC_STATE;
 
-	to_read = aux->bytes_in;
+	to_read = xstate->bytes_in;
 //	bytebuffer_max = 0x8000;
 	bytebuffer_offset = 4;
 	bytebuffer = xmalloc(bytebuffer_max);
 	n = inflate_unzip_internal(PASS_STATE in, out);
 	free(bytebuffer);
 
-	aux->crc32 = gunzip_crc;
-	aux->bytes_out = gunzip_bytes_out;
+	xstate->crc32 = gunzip_crc;
+	xstate->bytes_out = gunzip_bytes_out;
 	DEALLOC_STATE;
 	return n;
 }
@@ -1107,7 +1107,7 @@ static uint32_t buffer_read_le_u32(STATE_PARAM_ONLY)
 	return res;
 }
 
-static int check_header_gzip(STATE_PARAM transformer_aux_data_t *aux)
+static int check_header_gzip(STATE_PARAM transformer_state_t *xstate)
 {
 	union {
 		unsigned char raw[8];
@@ -1169,8 +1169,8 @@ static int check_header_gzip(STATE_PARAM transformer_aux_data_t *aux)
 		}
 	}
 
-	if (aux)
-		aux->mtime = SWAP_LE32(header.formatted.mtime);
+	if (xstate)
+		xstate->mtime = SWAP_LE32(header.formatted.mtime);
 
 	/* Read the header checksum */
 	if (header.formatted.flags & 0x02) {
@@ -1182,17 +1182,17 @@ static int check_header_gzip(STATE_PARAM transformer_aux_data_t *aux)
 }
 
 IF_DESKTOP(long long) int FAST_FUNC
-unpack_gz_stream(transformer_aux_data_t *aux, int src_fd, int dst_fd)
+unpack_gz_stream(transformer_state_t *xstate, int src_fd, int dst_fd)
 {
 	uint32_t v32;
 	IF_DESKTOP(long long) int total, n;
 	DECLARE_STATE;
 
 #if !ENABLE_FEATURE_SEAMLESS_Z
-	if (check_signature16(aux, src_fd, GZIP_MAGIC))
+	if (check_signature16(xstate, src_fd, GZIP_MAGIC))
 		return -1;
 #else
-	if (aux && aux->check_signature) {
+	if (xstate && xstate->check_signature) {
 		uint16_t magic2;
 
 		if (full_read(src_fd, &magic2, 2) != 2) {
@@ -1201,8 +1201,8 @@ unpack_gz_stream(transformer_aux_data_t *aux, int src_fd, int dst_fd)
 			return -1;
 		}
 		if (magic2 == COMPRESS_MAGIC) {
-			aux->check_signature = 0;
-			return unpack_Z_stream(aux, src_fd, dst_fd);
+			xstate->check_signature = 0;
+			return unpack_Z_stream(xstate, src_fd, dst_fd);
 		}
 		if (magic2 != GZIP_MAGIC)
 			goto bad_magic;
@@ -1218,7 +1218,7 @@ unpack_gz_stream(transformer_aux_data_t *aux, int src_fd, int dst_fd)
 	gunzip_src_fd = src_fd;
 
  again:
-	if (!check_header_gzip(PASS_STATE aux)) {
+	if (!check_header_gzip(PASS_STATE xstate)) {
 		bb_error_msg("corrupted data");
 		total = -1;
 		goto ret;
diff --git a/archival/libarchive/decompress_uncompress.c b/archival/libarchive/decompress_uncompress.c
index 53c27080f..cb3d55a88 100644
--- a/archival/libarchive/decompress_uncompress.c
+++ b/archival/libarchive/decompress_uncompress.c
@@ -73,7 +73,7 @@
  */
 
 IF_DESKTOP(long long) int FAST_FUNC
-unpack_Z_stream(transformer_aux_data_t *aux, int src_fd, int dst_fd)
+unpack_Z_stream(transformer_state_t *xstate, int src_fd, int dst_fd)
 {
 	IF_DESKTOP(long long total_written = 0;)
 	IF_DESKTOP(long long) int retval = -1;
@@ -102,7 +102,7 @@ unpack_Z_stream(transformer_aux_data_t *aux, int src_fd, int dst_fd)
 	/* block compress mode -C compatible with 2.0 */
 	int block_mode; /* = BLOCK_MODE; */
 
-	if (check_signature16(aux, src_fd, COMPRESS_MAGIC))
+	if (check_signature16(xstate, src_fd, COMPRESS_MAGIC))
 		return -1;
 
 	inbuf = xzalloc(IBUFSIZ + 64);
diff --git a/archival/libarchive/decompress_unlzma.c b/archival/libarchive/decompress_unlzma.c
index 3d99e1388..ccedac49d 100644
--- a/archival/libarchive/decompress_unlzma.c
+++ b/archival/libarchive/decompress_unlzma.c
@@ -206,7 +206,7 @@ enum {
 
 
 IF_DESKTOP(long long) int FAST_FUNC
-unpack_lzma_stream(transformer_aux_data_t *aux UNUSED_PARAM, int src_fd, int dst_fd)
+unpack_lzma_stream(transformer_state_t *xstate UNUSED_PARAM, int src_fd, int dst_fd)
 {
 	IF_DESKTOP(long long total_written = 0;)
 	lzma_header_t header;
diff --git a/archival/libarchive/decompress_unxz.c b/archival/libarchive/decompress_unxz.c
index 986b7b191..6df54e131 100644
--- a/archival/libarchive/decompress_unxz.c
+++ b/archival/libarchive/decompress_unxz.c
@@ -38,7 +38,7 @@ static uint32_t xz_crc32(const uint8_t *buf, size_t size, uint32_t crc)
 #include "unxz/xz_dec_stream.c"
 
 IF_DESKTOP(long long) int FAST_FUNC
-unpack_xz_stream(transformer_aux_data_t *aux, int src_fd, int dst_fd)
+unpack_xz_stream(transformer_state_t *xstate, int src_fd, int dst_fd)
 {
 	enum xz_ret xz_result;
 	struct xz_buf iobuf;
@@ -55,7 +55,7 @@ unpack_xz_stream(transformer_aux_data_t *aux, int src_fd, int dst_fd)
 	iobuf.out = membuf + BUFSIZ;
 	iobuf.out_size = BUFSIZ;
 
-	if (!aux || aux->check_signature == 0) {
+	if (!xstate || xstate->check_signature == 0) {
 		/* Preload XZ file signature */
 		strcpy((char*)membuf, HEADER_MAGIC);
 		iobuf.in_size = HEADER_MAGIC_SIZE;
diff --git a/archival/libarchive/open_transformer.c b/archival/libarchive/open_transformer.c
index 198663041..584b15de4 100644
--- a/archival/libarchive/open_transformer.c
+++ b/archival/libarchive/open_transformer.c
@@ -6,19 +6,19 @@
 #include "libbb.h"
 #include "bb_archive.h"
 
-void FAST_FUNC init_transformer_aux_data(transformer_aux_data_t *aux)
+void FAST_FUNC init_transformer_state(transformer_state_t *xstate)
 {
-	memset(aux, 0, sizeof(*aux));
+	memset(xstate, 0, sizeof(*xstate));
 }
 
-int FAST_FUNC check_signature16(transformer_aux_data_t *aux, int src_fd, unsigned magic16)
+int FAST_FUNC check_signature16(transformer_state_t *xstate, int src_fd, unsigned magic16)
 {
-	if (aux && aux->check_signature) {
+	if (xstate && xstate->check_signature) {
 		uint16_t magic2;
 		if (full_read(src_fd, &magic2, 2) != 2 || magic2 != magic16) {
 			bb_error_msg("invalid magic");
 #if 0 /* possible future extension */
-			if (aux->check_signature > 1)
+			if (xstate->check_signature > 1)
 				xfunc_die();
 #endif
 			return -1;
@@ -62,7 +62,7 @@ void check_errors_in_children(int signo)
 #if BB_MMU
 void FAST_FUNC open_transformer(int fd,
 	int check_signature,
-	IF_DESKTOP(long long) int FAST_FUNC (*transformer)(transformer_aux_data_t *aux, int src_fd, int dst_fd)
+	IF_DESKTOP(long long) int FAST_FUNC (*transformer)(transformer_state_t *xstate, int src_fd, int dst_fd)
 )
 #else
 void FAST_FUNC open_transformer(int fd, const char *transform_prog)
@@ -80,10 +80,10 @@ void FAST_FUNC open_transformer(int fd, const char *transform_prog)
 #if BB_MMU
 		{
 			IF_DESKTOP(long long) int r;
-			transformer_aux_data_t aux;
-			init_transformer_aux_data(&aux);
-			aux.check_signature = check_signature;
-			r = transformer(&aux, fd, fd_pipe.wr);
+			transformer_state_t xstate;
+			init_transformer_state(&xstate);
+			xstate.check_signature = check_signature;
+			r = transformer(&xstate, fd, fd_pipe.wr);
 			if (ENABLE_FEATURE_CLEAN_UP) {
 				close(fd_pipe.wr); /* send EOF */
 				close(fd);
@@ -126,7 +126,7 @@ int FAST_FUNC setup_unzip_on_fd(int fd, int fail_if_not_compressed)
 		uint32_t b32[1];
 	} magic;
 	int offset = -2;
-	USE_FOR_MMU(IF_DESKTOP(long long) int FAST_FUNC (*xformer)(transformer_aux_data_t *aux, int src_fd, int dst_fd);)
+	USE_FOR_MMU(IF_DESKTOP(long long) int FAST_FUNC (*xformer)(transformer_state_t *xstate, int src_fd, int dst_fd);)
 	USE_FOR_NOMMU(const char *xformer_prog;)
 
 	/* .gz and .bz2 both have 2-byte signature, and their
diff --git a/archival/lzop.c b/archival/lzop.c
index 5062d9300..73d11a705 100644
--- a/archival/lzop.c
+++ b/archival/lzop.c
@@ -1099,7 +1099,7 @@ static char* FAST_FUNC make_new_name_lzop(char *filename, const char *expected_e
 	return xasprintf("%s.lzo", filename);
 }
 
-static IF_DESKTOP(long long) int FAST_FUNC pack_lzop(transformer_aux_data_t *aux UNUSED_PARAM)
+static IF_DESKTOP(long long) int FAST_FUNC pack_lzop(transformer_state_t *xstate UNUSED_PARAM)
 {
 	if (option_mask32 & OPT_DECOMPRESS)
 		return do_lzo_decompress();
diff --git a/archival/tar.c b/archival/tar.c
index aa02d3512..7897a4af6 100644
--- a/archival/tar.c
+++ b/archival/tar.c
@@ -1171,7 +1171,7 @@ int tar_main(int argc UNUSED_PARAM, char **argv)
 	}
 
 	if (opt & OPT_ANY_COMPRESS) {
-		USE_FOR_MMU(IF_DESKTOP(long long) int FAST_FUNC (*xformer)(transformer_aux_data_t *aux, int src_fd, int dst_fd);)
+		USE_FOR_MMU(IF_DESKTOP(long long) int FAST_FUNC (*xformer)(transformer_state_t *xstate, int src_fd, int dst_fd);)
 		USE_FOR_NOMMU(const char *xformer_prog;)
 
 		if (opt & OPT_COMPRESS)
diff --git a/archival/unzip.c b/archival/unzip.c
index fcfc9a448..c622bde57 100644
--- a/archival/unzip.c
+++ b/archival/unzip.c
@@ -280,17 +280,17 @@ static void unzip_extract(zip_header_t *zip_header, int dst_fd)
 			bb_copyfd_exact_size(zip_fd, dst_fd, size);
 	} else {
 		/* Method 8 - inflate */
-		transformer_aux_data_t aux;
-		init_transformer_aux_data(&aux);
-		aux.bytes_in = zip_header->formatted.cmpsize;
-		if (inflate_unzip(&aux, zip_fd, dst_fd) < 0)
+		transformer_state_t xstate;
+		init_transformer_state(&xstate);
+		xstate.bytes_in = zip_header->formatted.cmpsize;
+		if (inflate_unzip(&xstate, zip_fd, dst_fd) < 0)
 			bb_error_msg_and_die("inflate error");
 		/* Validate decompression - crc */
-		if (zip_header->formatted.crc32 != (aux.crc32 ^ 0xffffffffL)) {
+		if (zip_header->formatted.crc32 != (xstate.crc32 ^ 0xffffffffL)) {
 			bb_error_msg_and_die("crc error");
 		}
 		/* Validate decompression - size */
-		if (zip_header->formatted.ucmpsize != aux.bytes_out) {
+		if (zip_header->formatted.ucmpsize != xstate.bytes_out) {
 			/* Don't die. Who knows, maybe len calculation
 			 * was botched somewhere. After all, crc matched! */
 			bb_error_msg("bad length");
diff --git a/include/bb_archive.h b/include/bb_archive.h
index b82cfd83c..8a2dd2735 100644
--- a/include/bb_archive.h
+++ b/include/bb_archive.h
@@ -203,27 +203,27 @@ int read_bunzip(bunzip_data *bd, char *outbuf, int len) FAST_FUNC;
 void dealloc_bunzip(bunzip_data *bd) FAST_FUNC;
 
 /* Meaning and direction (input/output) of the fields are transformer-specific */
-typedef struct transformer_aux_data_t {
+typedef struct transformer_state_t {
 	smallint check_signature; /* most often referenced member */
 	off_t    bytes_out;
 	off_t    bytes_in;  /* used in unzip code only: needs to know packed size */
 	uint32_t crc32;
 	time_t   mtime;     /* gunzip code may set this on exit */
-} transformer_aux_data_t;
+} transformer_state_t;
 
-void init_transformer_aux_data(transformer_aux_data_t *aux) FAST_FUNC;
-int FAST_FUNC check_signature16(transformer_aux_data_t *aux, int src_fd, unsigned magic16) FAST_FUNC;
+void init_transformer_state(transformer_state_t *xstate) FAST_FUNC;
+int FAST_FUNC check_signature16(transformer_state_t *xstate, int src_fd, unsigned magic16) FAST_FUNC;
 
-IF_DESKTOP(long long) int inflate_unzip(transformer_aux_data_t *aux, int src_fd, int dst_fd) FAST_FUNC;
-IF_DESKTOP(long long) int unpack_Z_stream(transformer_aux_data_t *aux, int src_fd, int dst_fd) FAST_FUNC;
-IF_DESKTOP(long long) int unpack_gz_stream(transformer_aux_data_t *aux, int src_fd, int dst_fd) FAST_FUNC;
-IF_DESKTOP(long long) int unpack_bz2_stream(transformer_aux_data_t *aux, int src_fd, int dst_fd) FAST_FUNC;
-IF_DESKTOP(long long) int unpack_lzma_stream(transformer_aux_data_t *aux, int src_fd, int dst_fd) FAST_FUNC;
-IF_DESKTOP(long long) int unpack_xz_stream(transformer_aux_data_t *aux, int src_fd, int dst_fd) FAST_FUNC;
+IF_DESKTOP(long long) int inflate_unzip(transformer_state_t *xstate, int src_fd, int dst_fd) FAST_FUNC;
+IF_DESKTOP(long long) int unpack_Z_stream(transformer_state_t *xstate, int src_fd, int dst_fd) FAST_FUNC;
+IF_DESKTOP(long long) int unpack_gz_stream(transformer_state_t *xstate, int src_fd, int dst_fd) FAST_FUNC;
+IF_DESKTOP(long long) int unpack_bz2_stream(transformer_state_t *xstate, int src_fd, int dst_fd) FAST_FUNC;
+IF_DESKTOP(long long) int unpack_lzma_stream(transformer_state_t *xstate, int src_fd, int dst_fd) FAST_FUNC;
+IF_DESKTOP(long long) int unpack_xz_stream(transformer_state_t *xstate, int src_fd, int dst_fd) FAST_FUNC;
 
 char* append_ext(char *filename, const char *expected_ext) FAST_FUNC;
 int bbunpack(char **argv,
-		IF_DESKTOP(long long) int FAST_FUNC (*unpacker)(transformer_aux_data_t *aux),
+		IF_DESKTOP(long long) int FAST_FUNC (*unpacker)(transformer_state_t *xstate),
 		char* FAST_FUNC (*make_new_name)(char *filename, const char *expected_ext),
 		const char *expected_ext
 ) FAST_FUNC;
@@ -232,7 +232,7 @@ void check_errors_in_children(int signo);
 #if BB_MMU
 void open_transformer(int fd,
 	int check_signature,
-	IF_DESKTOP(long long) int FAST_FUNC (*transformer)(transformer_aux_data_t *aux, int src_fd, int dst_fd)
+	IF_DESKTOP(long long) int FAST_FUNC (*transformer)(transformer_state_t *xstate, int src_fd, int dst_fd)
 ) FAST_FUNC;
 #define open_transformer_with_sig(fd, transformer, transform_prog) open_transformer((fd), 1, (transformer))
 #define open_transformer_with_no_sig(fd, transformer)              open_transformer((fd), 0, (transformer))