*: 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

3 files changed, 20 insertions, 18 deletions

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:" \