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https://github.com/MidnightCommander/mc
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* vfs/tar.c (PREFIX_SIZE): New macro definition.
(union unused): New union which describes better the trailing bytes of the tar record header. (union record): Do not assume that all tar archives follow the GNU tar archive format. (tar_open_archive_int): Initialize the variable holding the type fo the archive format. (tar_read_header): Try to determine the archive format using the `magic' field of the tar record header. Use the `linkflag' field as a fallback. Add support for pathnames of upto 256 characters as stored in ustar archives. Do not access GNU specific fields of the tar record header if the archive is not a GNU one. (tar_fill_stat): Pass pointer to vfs_s_super instead of pointer ot vfs_class as the first argument. Do not access GNU specific fields of the tar record header if the archive is not a GNU one.
This commit is contained in:
Pavel Tsekov
parent
488ac0c5f9
commit
17696f8d13
@ -1,3 +1,24 @@
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2006-04-17 Pavel Tsekov <ptsekov@gmx.net>
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* tar.c (PREFIX_SIZE): New macro definition.
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(union unused): New union which describes better the trailing bytes
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of the tar record header.
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(union record): Do not assume that all tar archives follow the GNU
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tar archive format.
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(tar_open_archive_int): Initialize the variable holding the type fo the
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archive format.
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(tar_read_header): Try to determine the archive format using the
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`magic' field of the tar record header. Use the `linkflag' field
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as a fallback.
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Add support for pathnames of upto 256 characters as stored in ustar
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archives.
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Do not access GNU specific fields of the tar record header if the
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archive is not a GNU one.
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(tar_fill_stat): Pass pointer to vfs_s_super instead of pointer ot
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vfs_class as the first argument.
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Do not access GNU specific fields of the tar record header if the
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archive is not a GNU one.
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2006-04-14 Pavel Tsekov <ptsekov@gmx.net>
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* tar.c (OLDGNU_MAGIC): New macro definition.
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124
vfs/tar.c
124
vfs/tar.c
@ -40,6 +40,14 @@
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static struct vfs_class vfs_tarfs_ops;
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enum {
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TAR_UNKNOWN = 0,
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TAR_V7,
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TAR_USTAR,
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TAR_POSIX,
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TAR_GNU
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};
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/*
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* Header block on tape.
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*
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@ -50,6 +58,7 @@ static struct vfs_class vfs_tarfs_ops;
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*/
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#define RECORDSIZE 512
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#define NAMSIZ 100
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#define PREFIX_SIZE 155
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#define TUNMLEN 32
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#define TGNMLEN 32
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#define SPARSE_EXT_HDR 21
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@ -82,8 +91,17 @@ union record {
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char gname[TGNMLEN];
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char devmajor[8];
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char devminor[8];
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/* these following fields were added by JF for gnu */
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/* and are NOT standard */
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/* The following bytes of the tar header record were originally unused.
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Archives following the ustar specification use almost all of those
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bytes to support pathnames of 256 characters in length.
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GNU tar archives use the "unused" space to support incremental
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archives and sparse files. */
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union unused {
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char prefix[PREFIX_SIZE];
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/* GNU extensions to the ustar (POSIX.1-1988) archive format. */
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struct oldgnu {
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char atime[12];
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char ctime[12];
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char offset[12];
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@ -92,8 +110,8 @@ union record {
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struct sparse sp[SPARSE_IN_HDR];
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char isextended;
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char realsize[12]; /* true size of the sparse file */
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/* char ending_blanks[12];*//* number of nulls at the
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end of the file, if any */
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} oldgnu;
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} unused;
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} header;
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struct extended_header {
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struct sparse sp[21];
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@ -223,6 +241,7 @@ tar_open_archive_int (struct vfs_class *me, const char *name,
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archive->name = g_strdup (name);
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mc_stat (name, &(archive->u.arch.st));
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archive->u.arch.fd = -1;
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archive->u.arch.type = TAR_UNKNOWN;
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/* Find out the method to handle this tar file */
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type = get_compression_type (result);
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@ -285,15 +304,9 @@ static void tar_skip_n_records (struct vfs_s_super *archive, int tard, int n)
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}
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static void
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tar_fill_stat (struct vfs_class *me, struct stat *st, union record *header,
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tar_fill_stat (struct vfs_s_super *archive, struct stat *st, union record *header,
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size_t h_size)
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{
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int is_gnu;
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(void) me;
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is_gnu = !strcmp (header->header.magic, OLDGNU_MAGIC);
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st->st_mode = tar_from_oct (8, header->header.mode);
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/* Adjust st->st_mode because there are tar-files with
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@ -315,7 +328,10 @@ tar_fill_stat (struct vfs_class *me, struct stat *st, union record *header,
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st->st_mode |= S_IFREG;
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st->st_rdev = 0;
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if (!strcmp (header->header.magic, TMAGIC) || is_gnu != 0) {
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switch (archive->u.arch.type) {
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case TAR_USTAR:
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case TAR_POSIX:
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case TAR_GNU:
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st->st_uid =
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*header->header.uname ? vfs_finduid (header->header.
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uname) : tar_from_oct (8,
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@ -335,14 +351,20 @@ tar_fill_stat (struct vfs_class *me, struct stat *st, union record *header,
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(tar_from_oct (8, header->header.devmajor) << 8) |
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tar_from_oct (8, header->header.devminor);
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}
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} else { /* Old Unix tar */
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default:
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st->st_uid = tar_from_oct (8, header->header.uid);
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st->st_gid = tar_from_oct (8, header->header.gid);
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}
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st->st_size = h_size;
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st->st_mtime = tar_from_oct (1 + 12, header->header.mtime);
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st->st_atime = tar_from_oct (1 + 12, header->header.atime);
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st->st_ctime = tar_from_oct (1 + 12, header->header.ctime);
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st->st_atime = 0;
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st->st_ctime = 0;
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if (archive->u.arch.type == TAR_GNU) {
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st->st_atime = tar_from_oct (1 + 12,
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header->header.unused.oldgnu.atime);
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st->st_ctime = tar_from_oct (1 + 12,
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header->header.unused.oldgnu.ctime);
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}
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}
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@ -405,6 +427,20 @@ tar_read_header (struct vfs_class *me, struct vfs_s_super *archive,
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if (sum != recsum && signed_sum != recsum)
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return STATUS_BADCHECKSUM;
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/*
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* Try to determine the archive format.
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*/
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if (archive->u.arch.type == TAR_UNKNOWN) {
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if (!strcmp (header->header.magic, TMAGIC)) {
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if (header->header.linkflag == LF_GLOBAL_EXTHDR)
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archive->u.arch.type = TAR_POSIX;
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else
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archive->u.arch.type = TAR_USTAR;
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} else if (!strcmp (header->header.magic, OLDGNU_MAGIC)) {
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archive->u.arch.type = TAR_GNU;
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}
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}
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/*
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* linkflag on BSDI tar (pax) always '\000'
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*/
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@ -431,16 +467,22 @@ tar_read_header (struct vfs_class *me, struct vfs_s_super *archive,
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* Skip over directory snapshot info records that
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* are stored in incremental tar archives.
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*/
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if (header->header.linkflag == LF_DUMPDIR)
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if (header->header.linkflag == LF_DUMPDIR) {
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if (archive->u.arch.type == TAR_UNKNOWN)
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archive->u.arch.type = TAR_GNU;
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return STATUS_SUCCESS;
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}
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/*
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* Skip over pax extended header and global extended
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* header records.
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*/
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if (header->header.linkflag == LF_EXTHDR ||
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header->header.linkflag == LF_GLOBAL_EXTHDR)
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header->header.linkflag == LF_GLOBAL_EXTHDR) {
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if (archive->u.arch.type == TAR_UNKNOWN)
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archive->u.arch.type = TAR_POSIX;
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return STATUS_SUCCESS;
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}
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if (header->header.linkflag == LF_LONGNAME
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|| header->header.linkflag == LF_LONGLINK) {
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@ -448,6 +490,9 @@ tar_read_header (struct vfs_class *me, struct vfs_s_super *archive,
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char *bp, *data;
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int size, written;
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if (archive->u.arch.type == TAR_UNKNOWN)
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archive->u.arch.type = TAR_GNU;
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if (*h_size > MC_MAXPATHLEN) {
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message (1, MSG_ERROR, _("Inconsistent tar archive"));
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return STATUS_BADCHECKSUM;
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@ -500,9 +545,43 @@ tar_read_header (struct vfs_class *me, struct vfs_s_super *archive,
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if (len > 1 && current_link_name[len - 1] == '/')
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current_link_name[len - 1] = 0;
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current_file_name =
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(next_long_name ? next_long_name :
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g_strndup (header->header.arch_name, NAMSIZ));
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current_file_name = NULL;
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switch (archive->u.arch.type) {
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case TAR_USTAR:
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case TAR_POSIX:
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/* The ustar archive format supports pathnames of upto 256
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* characters in length. This is achieved by concatenating
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* the contents of the `prefix' and `arch_name' fields like
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* this:
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*
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* prefix + path_separator + arch_name
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*
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* If the `prefix' field contains an empty string i.e. its
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* first characters is '\0' the prefix field is ignored.
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*/
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if (header->header.unused.prefix[0] != '\0') {
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char *temp_name, *temp_prefix;
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temp_name = g_strndup (header->header.arch_name, NAMSIZ);
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temp_prefix = g_strndup (header->header.unused.prefix,
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PREFIX_SIZE);
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current_file_name = g_strconcat (temp_prefix, PATH_SEP_STR,
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temp_name, (char *) NULL);
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g_free (temp_name);
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g_free (temp_prefix);
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}
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break;
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case TAR_GNU:
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if (next_long_name != NULL)
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current_file_name = next_long_name;
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break;
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default:
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break;
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}
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if (current_file_name == NULL)
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current_file_name = g_strndup (header->header.arch_name, NAMSIZ);
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canonicalize_pathname (current_file_name);
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len = strlen (current_file_name);
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@ -538,7 +617,7 @@ tar_read_header (struct vfs_class *me, struct vfs_s_super *archive,
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}
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}
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tar_fill_stat (me, &st, header, *h_size);
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tar_fill_stat (archive, &st, header, *h_size);
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inode = vfs_s_new_inode (me, archive, &st);
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inode->data_offset = data_position;
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@ -555,7 +634,8 @@ tar_read_header (struct vfs_class *me, struct vfs_s_super *archive,
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done:
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next_long_link = next_long_name = NULL;
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if (header->header.isextended) {
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if (archive->u.arch.type == TAR_GNU &&
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header->header.unused.oldgnu.isextended) {
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while (tar_get_next_record (archive, tard)->ext_hdr.
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isextended);
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inode->data_offset = current_tar_position;
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