diff options
author | Denis Vlasenko <vda.linux@googlemail.com> | 2008-06-28 09:04:09 +0400 |
---|---|---|
committer | Denis Vlasenko <vda.linux@googlemail.com> | 2008-06-28 09:04:09 +0400 |
commit | a60936da062fc569328cd643c460dcf215ed9966 (patch) | |
tree | f67e12d028c68c40d6ece445420cd5ab4046ff61 /archival/libunarchive/get_header_tar.c | |
parent | 9579d87be4ab9b02195749c15a2112e2a4466ab4 (diff) |
libunarchive: stop using static data in archivers - archive_handle_t
can trivially provide space for that.
rpm: code shrink
tar: simplify autodetection of bz2/.gz
function old new delta
static.not_first 1 - -1
static.end 1 - -1
bb_makedev 51 49 -2
static.saved_hardlinks_created 4 - -4
static.saved_hardlinks 4 - -4
longname 4 - -4
linkname 4 - -4
hash_file 251 247 -4
get_header_tar 1528 1521 -7
rpm_main 1711 1697 -14
get_header_cpio 965 944 -21
------------------------------------------------------------------------------
(add/remove: 0/6 grow/shrink: 0/5 up/down: 0/-66) Total: -66 bytes
text data bss dec hex filename
804926 611 6868 812405 c6575 busybox_old
804878 611 6852 812341 c6535 busybox_unstripped
Diffstat (limited to 'archival/libunarchive/get_header_tar.c')
-rw-r--r-- | archival/libunarchive/get_header_tar.c | 93 |
1 files changed, 44 insertions, 49 deletions
diff --git a/archival/libunarchive/get_header_tar.c b/archival/libunarchive/get_header_tar.c index a0a53c908..69362f1cc 100644 --- a/archival/libunarchive/get_header_tar.c +++ b/archival/libunarchive/get_header_tar.c @@ -14,26 +14,13 @@ #include "libbb.h" #include "unarchive.h" -#if ENABLE_FEATURE_TAR_GNU_EXTENSIONS -static char *longname; -static char *linkname; -#else -enum { - longname = 0, - linkname = 0, -}; -#endif - /* NB: _DESTROYS_ str[len] character! */ static unsigned long long getOctal(char *str, int len) { unsigned long long v; - /* Actually, tar header allows leading spaces also. - * Oh well, we will be liberal and skip this... - * The only downside probably is that we allow "-123" too :) - if (*str < '0' || *str > '7') - bb_error_msg_and_die("corrupted octal value in tar header"); - */ + /* NB: leading spaces are allowed. Using strtoull to handle that. + * The downside is that we accept e.g. "-123" too :) + */ str[len] = '\0'; v = strtoull(str, &str, 8); if (*str && (!ENABLE_FEATURE_TAR_OLDGNU_COMPATIBILITY || *str != ' ')) @@ -45,11 +32,6 @@ static unsigned long long getOctal(char *str, int len) void BUG_tar_header_size(void); char FAST_FUNC get_header_tar(archive_handle_t *archive_handle) { - static smallint end; -#if ENABLE_FEATURE_TAR_AUTODETECT - static smallint not_first; -#endif - file_header_t *file_header = archive_handle->file_header; struct { /* ustar header, Posix 1003.1 */ @@ -65,7 +47,7 @@ char FAST_FUNC get_header_tar(archive_handle_t *archive_handle) /* POSIX: "ustar" NUL "00" */ /* GNU tar: "ustar " NUL */ /* Normally it's defined as magic[6] followed by - * version[2], but we put them together to save code. + * version[2], but we put them together to simplify code */ char magic[8]; /* 257-264 */ char uname[32]; /* 265-296 */ @@ -82,6 +64,22 @@ char FAST_FUNC get_header_tar(archive_handle_t *archive_handle) #endif int parse_names; + /* Our "private data" */ +#define p_end (*(smallint *)(&archive_handle->ah_priv[0])) +#if ENABLE_FEATURE_TAR_GNU_EXTENSIONS +#define p_longname (*(char* *)(&archive_handle->ah_priv[1])) +#define p_linkname (*(char* *)(&archive_handle->ah_priv[2])) +#else +#define p_longname 0 +#define p_linkname 0 +#endif +// if (!archive_handle->ah_priv_inited) { +// archive_handle->ah_priv_inited = 1; +// p_end = 0; +// USE_FEATURE_TAR_GNU_EXTENSIONS(p_longname = NULL;) +// USE_FEATURE_TAR_GNU_EXTENSIONS(p_linkname = NULL;) +// } + if (sizeof(tar) != 512) BUG_tar_header_size(); @@ -95,7 +93,7 @@ char FAST_FUNC get_header_tar(archive_handle_t *archive_handle) #if ENABLE_DESKTOP i = full_read(archive_handle->src_fd, &tar, 512); - /* if GNU tar sees EOF in above read, it says: + /* 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. @@ -113,18 +111,18 @@ char FAST_FUNC get_header_tar(archive_handle_t *archive_handle) /* If there is no filename its an empty header */ if (tar.name[0] == 0 && tar.prefix[0] == 0) { - if (end) { - /* This is the second consecutive empty header! End of archive! + if (p_end) { + /* Second consecutive empty header - end of archive. * Read until the end to empty the pipe from gz or bz2 */ while (full_read(archive_handle->src_fd, &tar, 512) == 512) continue; return EXIT_FAILURE; } - end = 1; + p_end = 1; return EXIT_SUCCESS; } - end = 0; + p_end = 0; /* Check header has valid magic, "ustar" is for the proper tar, * five NULs are for the old tar format */ @@ -136,12 +134,10 @@ char FAST_FUNC get_header_tar(archive_handle_t *archive_handle) char FAST_FUNC (*get_header_ptr)(archive_handle_t *); /* tar gz/bz autodetect: check for gz/bz2 magic. - * If it is the very first block, and we see the magic, + * If we see the magic, and it is the very first block, * we can switch to get_header_tar_gz/bz2/lzma(). * Needs seekable fd. I wish recv(MSG_PEEK) works * on any fd... */ - if (not_first) - goto err; #if ENABLE_FEATURE_TAR_GZIP if (tar.name[0] == 0x1f && tar.name[1] == (char)0x8b) { /* gzip */ get_header_ptr = get_header_tar_gz; @@ -155,6 +151,9 @@ char FAST_FUNC get_header_tar(archive_handle_t *archive_handle) } else #endif goto err; + /* 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) goto err; while (get_header_ptr(archive_handle) == EXIT_SUCCESS) @@ -165,10 +164,6 @@ char FAST_FUNC get_header_tar(archive_handle_t *archive_handle) bb_error_msg_and_die("invalid tar magic"); } -#if ENABLE_FEATURE_TAR_AUTODETECT - not_first = 1; -#endif - /* Do checksum on headers. * POSIX says that checksum is done on unsigned bytes, but * Sun and HP-UX gets it wrong... more details in @@ -219,7 +214,7 @@ char FAST_FUNC get_header_tar(archive_handle_t *archive_handle) tar.prefix[0] = t; } file_header->link_target = NULL; - if (!linkname && parse_names && tar.linkname[0]) { + if (!p_linkname && parse_names && tar.linkname[0]) { file_header->link_target = xstrndup(tar.linkname, sizeof(tar.linkname)); /* FIXME: what if we have non-link object with link_target? */ /* Will link_target be free()ed? */ @@ -236,7 +231,7 @@ char FAST_FUNC get_header_tar(archive_handle_t *archive_handle) file_header->mode = 07777 & GET_OCTAL(tar.mode); file_header->name = NULL; - if (!longname && parse_names) { + if (!p_longname && parse_names) { /* we trash mode[0] here, it's ok */ //tar.name[sizeof(tar.name)] = '\0'; - gcc 4.3.0 would complain tar.mode[0] = '\0'; @@ -284,20 +279,20 @@ char FAST_FUNC get_header_tar(archive_handle_t *archive_handle) #if ENABLE_FEATURE_TAR_GNU_EXTENSIONS case 'L': /* free: paranoia: tar with several consecutive longnames */ - free(longname); + free(p_longname); /* For paranoia reasons we allocate extra NUL char */ - longname = xzalloc(file_header->size + 1); + p_longname = xzalloc(file_header->size + 1); /* We read ASCIZ string, including NUL */ - xread(archive_handle->src_fd, longname, file_header->size); + xread(archive_handle->src_fd, p_longname, file_header->size); archive_handle->offset += file_header->size; /* return get_header_tar(archive_handle); */ /* gcc 4.1.1 didn't optimize it into jump */ /* so we will do it ourself, this also saves stack */ goto again; case 'K': - free(linkname); - linkname = xzalloc(file_header->size + 1); - xread(archive_handle->src_fd, linkname, file_header->size); + free(p_linkname); + p_linkname = xzalloc(file_header->size + 1); + xread(archive_handle->src_fd, p_linkname, file_header->size); archive_handle->offset += file_header->size; /* return get_header_tar(archive_handle); */ goto again; @@ -324,13 +319,13 @@ char FAST_FUNC get_header_tar(archive_handle_t *archive_handle) } #if ENABLE_FEATURE_TAR_GNU_EXTENSIONS - if (longname) { - file_header->name = longname; - longname = NULL; + if (p_longname) { + file_header->name = p_longname; + p_longname = NULL; } - if (linkname) { - file_header->link_target = linkname; - linkname = NULL; + if (p_linkname) { + file_header->link_target = p_linkname; + p_linkname = NULL; } #endif if (!strncmp(file_header->name, "/../"+1, 3) @@ -349,7 +344,7 @@ char FAST_FUNC get_header_tar(archive_handle_t *archive_handle) /* Note that we kill the '/' only after action_header() */ /* (like GNU tar 1.15.1: verbose mode outputs "dir/dir/") */ if (cp) *cp = '\0'; - archive_handle->flags |= ARCHIVE_EXTRACT_QUIET; + archive_handle->ah_flags |= ARCHIVE_EXTRACT_QUIET; archive_handle->action_data(archive_handle); llist_add_to(&(archive_handle->passed), file_header->name); } else { |