dpkg_deb: slight code shrink
ar: reuse existing ar unpacking code
get_header_tar: handle autodetection for tiny .tar.gz files too
unarchive.h: do not include CONFIGed out things
function old new delta
get_header_tar 1521 1534 +13
dpkg_deb_main 400 380 -20
ar_main 260 196 -64
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 1/2 up/down: 13/-84) Total: -71 bytes
diff --git a/archival/Config.in b/archival/Config.in
index 4599b68..02daae1 100644
--- a/archival/Config.in
+++ b/archival/Config.in
@@ -90,10 +90,11 @@
bool "dpkg"
default n
help
- dpkg is a medium-level tool to install, build, remove and manage Debian packages.
+ dpkg is a medium-level tool to install, build, remove and manage
+ Debian packages.
- This implementation of dpkg has a number of limitations, you should use the
- official dpkg if possible.
+ This implementation of dpkg has a number of limitations,
+ you should use the official dpkg if possible.
config DPKG_DEB
bool "dpkg_deb"
@@ -103,8 +104,8 @@
This implementation of dpkg-deb cannot pack archives.
- Unless you have a specific application which requires dpkg-deb, you should
- probably say N here.
+ Unless you have a specific application which requires dpkg-deb,
+ say N here.
config FEATURE_DPKG_DEB_EXTRACT_ONLY
bool "Extract only (-x)"
diff --git a/archival/ar.c b/archival/ar.c
index d49329c..dbff677 100644
--- a/archival/ar.c
+++ b/archival/ar.c
@@ -45,7 +45,6 @@
archive_handle_t *archive_handle;
unsigned opt;
- char magic[8];
archive_handle = init_handle();
@@ -82,14 +81,7 @@
llist_add_to(&(archive_handle->accept), argv[optind++]);
}
- xread(archive_handle->src_fd, magic, 7);
- if (strncmp(magic, "!<arch>", 7) != 0) {
- bb_error_msg_and_die("invalid ar magic");
- }
- archive_handle->offset += 7;
-
- while (get_header_ar(archive_handle) == EXIT_SUCCESS)
- continue;
+ unpack_ar_archive(archive_handle);
return EXIT_SUCCESS;
}
diff --git a/archival/dpkg_deb.c b/archival/dpkg_deb.c
index cbacc91..9e6340f 100644
--- a/archival/dpkg_deb.c
+++ b/archival/dpkg_deb.c
@@ -20,8 +20,8 @@
archive_handle_t *tar_archive;
llist_t *control_tar_llist = NULL;
unsigned opt;
- const char *extract_dir = NULL;
- short argcount = 1;
+ const char *extract_dir;
+ int need_args;
/* Setup the tar archive handle */
tar_archive = init_handle();
@@ -43,17 +43,21 @@
opt_complementary = "c--efXx:e--cfXx:f--ceXx:X--cefx:x--cefX";
opt = getopt32(argv, "cefXx");
+ argv += optind;
+ argc -= optind;
if (opt & DPKG_DEB_OPT_CONTENTS) {
tar_archive->action_header = header_verbose_list;
}
+ extract_dir = NULL;
+ need_args = 1;
if (opt & DPKG_DEB_OPT_CONTROL) {
ar_archive->accept = control_tar_llist;
tar_archive->action_data = data_extract_all;
- if (optind + 1 == argc) {
+ if (1 == argc) {
extract_dir = "./DEBIAN";
} else {
- argcount++;
+ need_args++;
}
}
if (opt & DPKG_DEB_OPT_FIELD) {
@@ -70,28 +74,31 @@
}
if (opt & (DPKG_DEB_OPT_EXTRACT_VERBOSE | DPKG_DEB_OPT_EXTRACT)) {
tar_archive->action_data = data_extract_all;
- argcount = 2;
+ need_args = 2;
}
- if ((optind + argcount) != argc) {
+ if (need_args != argc) {
bb_show_usage();
}
- tar_archive->src_fd = ar_archive->src_fd = xopen(argv[optind++], O_RDONLY);
+ tar_archive->src_fd = ar_archive->src_fd = xopen(argv[0], O_RDONLY);
- /* Workout where to extract the files */
+ /* Work out where to extract the files */
/* 2nd argument is a dir name */
- if (argv[optind]) {
- extract_dir = argv[optind];
+ if (argv[1]) {
+ extract_dir = argv[1];
}
if (extract_dir) {
mkdir(extract_dir, 0777); /* bb_make_directory(extract_dir, 0777, 0) */
xchdir(extract_dir);
}
+
+ /* Do it */
unpack_ar_archive(ar_archive);
/* Cleanup */
- close(ar_archive->src_fd);
+ if (ENABLE_FEATURE_CLEAN_UP)
+ close(ar_archive->src_fd);
return EXIT_SUCCESS;
}
diff --git a/archival/libunarchive/filter_accept_list_reassign.c b/archival/libunarchive/filter_accept_list_reassign.c
index 4f2d4cd..4dbc2d1 100644
--- a/archival/libunarchive/filter_accept_list_reassign.c
+++ b/archival/libunarchive/filter_accept_list_reassign.c
@@ -8,6 +8,8 @@
#include "libbb.h"
#include "unarchive.h"
+/* Built and used only if ENABLE_DPKG || ENABLE_DPKG_DEB */
+
/*
* Reassign the subarchive metadata parser based on the filename extension
* e.g. if its a .tar.gz modify archive_handle->sub_archive to process a .tar.gz
@@ -19,23 +21,25 @@
if (find_list_entry(archive_handle->accept, archive_handle->file_header->name)) {
const char *name_ptr;
- /* Extract the last 2 extensions */
+ /* Find extension */
name_ptr = strrchr(archive_handle->file_header->name, '.');
/* Modify the subarchive handler based on the extension */
-#if ENABLE_FEATURE_DEB_TAR_GZ
- if (strcmp(name_ptr, ".gz") == 0) {
+ if (ENABLE_FEATURE_DEB_TAR_GZ
+ && strcmp(name_ptr, ".gz") == 0
+ ) {
archive_handle->action_data_subarchive = get_header_tar_gz;
return EXIT_SUCCESS;
}
-#endif
-#if ENABLE_FEATURE_DEB_TAR_BZ2
- if (strcmp(name_ptr, ".bz2") == 0) {
+ if (ENABLE_FEATURE_DEB_TAR_BZ2
+ && strcmp(name_ptr, ".bz2") == 0
+ ) {
archive_handle->action_data_subarchive = get_header_tar_bz2;
return EXIT_SUCCESS;
}
-#endif
- if (ENABLE_FEATURE_DEB_TAR_LZMA && !strcmp(name_ptr, ".lzma")) {
+ if (ENABLE_FEATURE_DEB_TAR_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_ar.c b/archival/libunarchive/get_header_ar.c
index 59fd34c..d476a9d 100644
--- a/archival/libunarchive/get_header_ar.c
+++ b/archival/libunarchive/get_header_ar.c
@@ -108,12 +108,13 @@
if (archive_handle->filter(archive_handle) == EXIT_SUCCESS) {
archive_handle->action_header(typed);
+#if ENABLE_DPKG || ENABLE_DPKG_DEB
if (archive_handle->sub_archive) {
while (archive_handle->action_data_subarchive(archive_handle->sub_archive) == EXIT_SUCCESS)
continue;
- } else {
+ } else
+#endif
archive_handle->action_data(archive_handle);
- }
} else {
data_skip(archive_handle);
}
diff --git a/archival/libunarchive/get_header_tar.c b/archival/libunarchive/get_header_tar.c
index 69362f1..cf35d41 100644
--- a/archival/libunarchive/get_header_tar.c
+++ b/archival/libunarchive/get_header_tar.c
@@ -92,22 +92,32 @@
again_after_align:
#if ENABLE_DESKTOP
+ /* to prevent misdetection of bz2 sig */
+ *(uint32_t*)(&tar) = 0;
i = full_read(archive_handle->src_fd, &tar, 512);
/* If GNU tar sees EOF in above read, it says:
* "tar: A lone zero block at N", where N = kilobyte
* where EOF was met (not EOF block, actual EOF!),
- * and tar will exit with error code 0.
+ * and exits with EXIT_SUCCESS.
* We will mimic exit(EXIT_SUCCESS), although we will not mimic
* the message and we don't check whether we indeed
* saw zero block directly before this. */
- if (i == 0)
+ if (i == 0) {
xfunc_error_retval = 0;
- if (i != 512)
+ short_read:
bb_error_msg_and_die("short read");
+ }
+ if (i != 512) {
+ if (ENABLE_FEATURE_TAR_AUTODETECT)
+ goto autodetect;
+ goto short_read;
+ }
+
#else
- xread(archive_handle->src_fd, &tar, 512);
+ i = 512;
+ xread(archive_handle->src_fd, &tar, i);
#endif
- archive_handle->offset += 512;
+ archive_handle->offset += i;
/* If there is no filename its an empty header */
if (tar.name[0] == 0 && tar.prefix[0] == 0) {
@@ -133,6 +143,7 @@
#if ENABLE_FEATURE_TAR_AUTODETECT
char FAST_FUNC (*get_header_ptr)(archive_handle_t *);
+ USE_DESKTOP(autodetect:)
/* tar gz/bz autodetect: check for gz/bz2 magic.
* If we see the magic, and it is the very first block,
* we can switch to get_header_tar_gz/bz2/lzma().
@@ -154,7 +165,7 @@
/* Two different causes for lseek() != 0:
* unseekable fd (would like to support that too, but...),
* or not first block (false positive, it's not .gz/.bz2!) */
- if (lseek(archive_handle->src_fd, -512, SEEK_CUR) != 0)
+ if (lseek(archive_handle->src_fd, -i, SEEK_CUR) != 0)
goto err;
while (get_header_ptr(archive_handle) == EXIT_SUCCESS)
continue;
@@ -328,7 +339,7 @@
p_linkname = NULL;
}
#endif
- if (!strncmp(file_header->name, "/../"+1, 3)
+ if (strncmp(file_header->name, "/../"+1, 3) == 0
|| strstr(file_header->name, "/../")
) {
bb_error_msg_and_die("name with '..' encountered: '%s'",
@@ -340,7 +351,7 @@
cp = last_char_is(file_header->name, '/');
if (archive_handle->filter(archive_handle) == EXIT_SUCCESS) {
- archive_handle->action_header(archive_handle->file_header);
+ archive_handle->action_header(/*archive_handle->*/ file_header);
/* Note that we kill the '/' only after action_header() */
/* (like GNU tar 1.15.1: verbose mode outputs "dir/dir/") */
if (cp) *cp = '\0';
diff --git a/archival/libunarchive/get_header_tar_gz.c b/archival/libunarchive/get_header_tar_gz.c
index 086c6df..e88b720 100644
--- a/archival/libunarchive/get_header_tar_gz.c
+++ b/archival/libunarchive/get_header_tar_gz.c
@@ -20,6 +20,7 @@
* need the header. */
#if BB_MMU
xread(archive_handle->src_fd, &magic, 2);
+ /* Can skip this check, but error message will be less clear */
if ((magic[0] != 0x1f) || (magic[1] != 0x8b)) {
bb_error_msg_and_die("invalid gzip magic");
}
diff --git a/archival/libunarchive/unpack_ar_archive.c b/archival/libunarchive/unpack_ar_archive.c
index 9c2f68b..dc2eec2 100644
--- a/archival/libunarchive/unpack_ar_archive.c
+++ b/archival/libunarchive/unpack_ar_archive.c
@@ -16,5 +16,6 @@
}
ar_archive->offset += 7;
- while (get_header_ar(ar_archive) == EXIT_SUCCESS);
+ while (get_header_ar(ar_archive) == EXIT_SUCCESS)
+ continue;
}
diff --git a/include/unarchive.h b/include/unarchive.h
index 0e380db..5b71d3e 100644
--- a/include/unarchive.h
+++ b/include/unarchive.h
@@ -47,11 +47,13 @@
/* Process the data component, e.g. extract to filesystem */
void FAST_FUNC (*action_data)(struct archive_handle_t *);
+#if ENABLE_DPKG || ENABLE_DPKG_DEB
+ /* "subarchive" is used only by dpkg[-deb] applets */
/* How to process any sub archive, e.g. get_header_tar_gz */
char FAST_FUNC (*action_data_subarchive)(struct archive_handle_t *);
-
/* Contains the handle to a sub archive */
struct archive_handle_t *sub_archive;
+#endif
/* The raw stream as read from disk or stdin */
int src_fd;
