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This commit is contained in:
François Pinard
1994-11-16 02:45:55 +00:00
parent 67766d811b
commit 5b394b2c7e
1 changed files with 299 additions and 274 deletions
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573
src/extract.c
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@@ -145,6 +145,9 @@ extract_archive()
union record *exhdr;
struct saved_dir_info *tmp;
/* int end_nulls; */
char **longp;
static char *longname;
static char *longlink;
saverec(&head); /* Make sure it sticks around */
userec(head); /* And go past it in the archive */
@@ -177,298 +180,298 @@ extract_archive()
skipcrud++; /* Force relative path */
if (!warned_once++) {
msg("Removing leading / from absolute path names in the archive.");
}
}
}
}
switch (head->header.linkflag) {
switch (head->header.linkflag) {
default:
msg("Unknown file type '%c' for %s, extracted as normal file",
head->header.linkflag, skipcrud+head->header.name);
/* FALL THRU */
default:
msg("Unknown file type '%c' for %s, extracted as normal file",
head->header.linkflag, skipcrud+head->header.name);
/* FALL THRU */
/*
* JK - What we want to do if the file is sparse is loop through
* the array of sparse structures in the header and read in
* and translate the character strings representing 1) the offset
* at which to write and 2) how many bytes to write into numbers,
* which we store into the scratch array, "sparsearray". This
* array makes our life easier the same way it did in creating
* the tar file that had to deal with a sparse file.
*
* After we read in the first five (at most) sparse structures,
* we check to see if the file has an extended header, i.e.,
* if more sparse structures are needed to describe the contents
* of the new file. If so, we read in the extended headers
* and continue to store their contents into the sparsearray.
*/
case LF_SPARSE:
sp_array_size = 10;
sparsearray = (struct sp_array *) malloc(sp_array_size * sizeof(struct sp_array));
for (i = 0; i < SPARSE_IN_HDR; i++) {
sparsearray[i].offset =
from_oct(1+12, head->header.sp[i].offset);
sparsearray[i].numbytes =
from_oct(1+12, head->header.sp[i].numbytes);
if (!sparsearray[i].numbytes)
break;
}
/* end_nulls = from_oct(1+12, head->header.ending_blanks);*/
if (head->header.isextended) {
/* read in the list of extended headers
and translate them into the sparsearray
as before */
/*
* JK - What we want to do if the file is sparse is loop through
* the array of sparse structures in the header and read in
* and translate the character strings representing 1) the offset
* at which to write and 2) how many bytes to write into numbers,
* which we store into the scratch array, "sparsearray". This
* array makes our life easier the same way it did in creating
* the tar file that had to deal with a sparse file.
*
* After we read in the first five (at most) sparse structures,
* we check to see if the file has an extended header, i.e.,
* if more sparse structures are needed to describe the contents
* of the new file. If so, we read in the extended headers
* and continue to store their contents into the sparsearray.
*/
case LF_SPARSE:
sp_array_size = 10;
sparsearray = (struct sp_array *) malloc(sp_array_size * sizeof(struct sp_array));
for (i = 0; i < SPARSE_IN_HDR; i++) {
sparsearray[i].offset =
from_oct(1+12, head->header.sp[i].offset);
sparsearray[i].numbytes =
from_oct(1+12, head->header.sp[i].numbytes);
if (!sparsearray[i].numbytes)
break;
}
/* static */ int ind = SPARSE_IN_HDR;
for (;;) {
exhdr = findrec();
for (i = 0; i < SPARSE_EXT_HDR; i++) {
if (i+ind > sp_array_size-1) {
/*
* realloc the scratch area
* since we've run out of room --
*/
sparsearray = (struct sp_array *)
realloc(sparsearray,
2 * sp_array_size * (sizeof(struct sp_array)));
sp_array_size *= 2;
}
if (!exhdr->ext_hdr.sp[i].numbytes)
break;
sparsearray[i+ind].offset =
from_oct(1+12, exhdr->ext_hdr.sp[i].offset);
sparsearray[i+ind].numbytes =
from_oct(1+12, exhdr->ext_hdr.sp[i].numbytes);
}
if (!exhdr->ext_hdr.isextended)
break;
else {
ind += SPARSE_EXT_HDR;
userec(exhdr);
}
}
userec(exhdr);
}
/* FALL THRU */
case LF_OLDNORMAL:
case LF_NORMAL:
case LF_CONTIG:
/*
* Appears to be a file.
* See if it's really a directory.
*/
namelen = strlen(skipcrud+head->header.name)-1;
if (head->header.name[skipcrud+namelen] == '/')
goto really_dir;
/* end_nulls = from_oct(1+12, head->header.ending_blanks);*/
/* FIXME, deal with protection issues */
again_file:
openflag = (f_keep?
O_BINARY|O_NDELAY|O_WRONLY|O_CREAT|O_EXCL:
O_BINARY|O_NDELAY|O_WRONLY|O_CREAT|O_TRUNC)
| ((head->header.linkflag == LF_SPARSE) ? 0 : O_APPEND);
/*
* JK - The last | is a kludge to solve the problem
* the O_APPEND flag causes with files we are
* trying to make sparse: when a file is opened
* with O_APPEND, it writes to the last place
* that something was written, thereby ignoring
* any lseeks that we have done. We add this
* extra condition to make it able to lseek when
* a file is sparse, i.e., we don't open the new
* file with this flag. (Grump -- this bug caused
* me to waste a good deal of time, I might add)
*/
if (head->header.isextended) {
/* read in the list of extended headers
and translate them into the sparsearray
as before */
if(f_exstdout) {
fd = 1;
goto extract_file;
}
#ifdef O_CTG
/*
* Contiguous files (on the Masscomp) have to specify
* the size in the open call that creates them.
*/
if (head->header.linkflag == LF_CONTIG)
fd = open(skipcrud+head->header.name, openflag | O_CTG,
hstat.st_mode, hstat.st_size);
else
#endif
{
#ifdef NO_OPEN3
/*
* On raw V7 we won't let them specify -k (f_keep), but
* we just bull ahead and create the files.
*/
fd = creat(skipcrud+head->header.name,
hstat.st_mode);
#else
/*
* With 3-arg open(), we can do this up right.
*/
fd = open(skipcrud+head->header.name, openflag,
hstat.st_mode);
#endif
}
/* static */ int ind = SPARSE_IN_HDR;
if (fd < 0) {
if (make_dirs(skipcrud+head->header.name))
goto again_file;
msg_perror("Could not create file %s",skipcrud+head->header.name);
if (head->header.isextended)
skip_extended_headers();
skip_file((long)hstat.st_size);
goto quit;
}
for (;;) {
extract_file:
if (head->header.linkflag == LF_SPARSE) {
char *name;
int namelen;
exhdr = findrec();
for (i = 0; i < SPARSE_EXT_HDR; i++) {
/*
* Kludge alert. NAME is assigned to header.name
* because during the extraction, the space that
* contains the header will get scribbled on, and
* the name will get munged, so any error messages
* that happen to contain the filename will look
* REAL interesting unless we do this.
*/
namelen = strlen(skipcrud+head->header.name);
name = (char *) malloc((sizeof(char)) * namelen);
bcopy(skipcrud+head->header.name, name, namelen);
size = hstat.st_size;
extract_sparse_file(fd, &size, hstat.st_size,
name);
}
else
for (size = hstat.st_size;
size > 0;
size -= written) {
if (i+ind > sp_array_size-1) {
/*
* realloc the scratch area
* since we've run out of room --
*/
sparsearray = (struct sp_array *)
realloc(sparsearray,
2 * sp_array_size * (sizeof(struct sp_array)));
sp_array_size *= 2;
}
if (!exhdr->ext_hdr.sp[i].numbytes)
break;
sparsearray[i+ind].offset =
from_oct(1+12, exhdr->ext_hdr.sp[i].offset);
sparsearray[i+ind].numbytes =
from_oct(1+12, exhdr->ext_hdr.sp[i].numbytes);
}
if (!exhdr->ext_hdr.isextended)
break;
else {
ind += SPARSE_EXT_HDR;
userec(exhdr);
}
}
userec(exhdr);
}
/* long offset,
numbytes;*/
/* FALL THRU */
case LF_OLDNORMAL:
case LF_NORMAL:
case LF_CONTIG:
/*
* Appears to be a file.
* See if it's really a directory.
*/
namelen = strlen(skipcrud+head->header.name)-1;
if (head->header.name[skipcrud+namelen] == '/')
goto really_dir;
if(f_multivol) {
save_name=head->header.name;
save_totsize=hstat.st_size;
save_sizeleft=size;
}
/*
* Locate data, determine max length
* writeable, write it, record that
* we have used the data, then check
* if the write worked.
*/
data = findrec()->charptr;
if (data == NULL) { /* Check it... */
msg("Unexpected EOF on archive file");
break;
}
/*
* JK - If the file is sparse, use the sparsearray
* that we created before to lseek into the new
* file the proper amount, and to see how many
* bytes we want to write at that position.
*/
/* if (head->header.linkflag == LF_SPARSE) {
off_t pos;
pos = lseek(fd, (off_t) sparsearray[sparse_ind].offset, 0);
printf("%d at %d\n", (int) pos, sparse_ind);
written = sparsearray[sparse_ind++].numbytes;
} else*/
written = endofrecs()->charptr - data;
if (written > size)
written = size;
errno = 0;
check = write(fd, data, written);
/*
* The following is in violation of strict
* typing, since the arg to userec
* should be a struct rec *. FIXME.
*/
userec((union record *)(data + written - 1));
if (check == written) continue;
/*
* Error in writing to file.
* Print it, skip to next file in archive.
*/
if(check<0)
msg_perror("couldn't write to file %s",skipcrud+head->header.name);
else
msg("could only write %d of %d bytes to file %s",written,check,skipcrud+head->header.name);
skip_file((long)(size - written));
break; /* Still do the close, mod time, chmod, etc */
}
/* FIXME, deal with protection issues */
again_file:
openflag = (f_keep?
O_BINARY|O_NDELAY|O_WRONLY|O_CREAT|O_EXCL:
O_BINARY|O_NDELAY|O_WRONLY|O_CREAT|O_TRUNC)
| ((head->header.linkflag == LF_SPARSE) ? 0 : O_APPEND);
/*
* JK - The last | is a kludge to solve the problem
* the O_APPEND flag causes with files we are
* trying to make sparse: when a file is opened
* with O_APPEND, it writes to the last place
* that something was written, thereby ignoring
* any lseeks that we have done. We add this
* extra condition to make it able to lseek when
* a file is sparse, i.e., we don't open the new
* file with this flag. (Grump -- this bug caused
* me to waste a good deal of time, I might add)
*/
if(f_multivol)
save_name = 0;
if(f_exstdout) {
fd = 1;
goto extract_file;
}
#ifdef O_CTG
/*
* Contiguous files (on the Masscomp) have to specify
* the size in the open call that creates them.
*/
if (head->header.linkflag == LF_CONTIG)
fd = open(skipcrud+head->header.name, openflag | O_CTG,
hstat.st_mode, hstat.st_size);
else
#endif
{
#ifdef NO_OPEN3
/*
* On raw V7 we won't let them specify -k (f_keep), but
* we just bull ahead and create the files.
*/
fd = creat(skipcrud+head->header.name,
hstat.st_mode);
#else
/*
* With 3-arg open(), we can do this up right.
*/
fd = open(skipcrud+head->header.name, openflag,
hstat.st_mode);
#endif
}
/* If writing to stdout, don't try to do anything
to the filename; it doesn't exist, or we don't
want to touch it anyway */
if(f_exstdout)
break;
/* if (head->header.isextended) {
register union record *exhdr;
register int i;
for (i = 0; i < 21; i++) {
long offset;
if (!exhdr->ext_hdr.sp[i].numbytes)
break;
offset = from_oct(1+12,
exhdr->ext_hdr.sp[i].offset);
written = from_oct(1+12,
exhdr->ext_hdr.sp[i].numbytes);
lseek(fd, offset, 0);
check = write(fd, data, written);
if (check == written) continue;
if (fd < 0) {
if (make_dirs(skipcrud+head->header.name))
goto again_file;
msg_perror("Could not create file %s",skipcrud+head->header.name);
if (head->header.isextended)
skip_extended_headers();
skip_file((long)hstat.st_size);
goto quit;
}
}
extract_file:
if (head->header.linkflag == LF_SPARSE) {
char *name;
int namelen;
}*/
check = close(fd);
if (check < 0) {
msg_perror("Error while closing %s",skipcrud+head->header.name);
}
/*
* Kludge alert. NAME is assigned to header.name
* because during the extraction, the space that
* contains the header will get scribbled on, and
* the name will get munged, so any error messages
* that happen to contain the filename will look
* REAL interesting unless we do this.
*/
namelen = strlen(skipcrud+head->header.name);
name = (char *) malloc((sizeof(char)) * namelen);
bcopy(skipcrud+head->header.name, name, namelen);
size = hstat.st_size;
extract_sparse_file(fd, &size, hstat.st_size,
name);
}
else
for (size = hstat.st_size;
size > 0;
size -= written) {
set_filestat:
/* long offset,
numbytes;*/
/*
* If we are root, set the owner and group of the extracted
* file. This does what is wanted both on real Unix and on
* System V. If we are running as a user, we extract as that
* user; if running as root, we extract as the original owner.
*/
if (we_are_root || f_do_chown) {
if (chown(skipcrud+head->header.name, hstat.st_uid,
hstat.st_gid) < 0) {
msg_perror("cannot chown file %s to uid %d gid %d",skipcrud+head->header.name,hstat.st_uid,hstat.st_gid);
}
}
if(f_multivol) {
save_name=head->header.name;
save_totsize=hstat.st_size;
save_sizeleft=size;
}
/*
* Set the modified time of the file.
*
* Note that we set the accessed time to "now", which
* is really "the time we started extracting files".
* unless f_gnudump is used, in which case .st_atime is used
*/
if (!f_modified) {
/* fixme if f_gnudump should set ctime too, but how? */
/*
* Locate data, determine max length
* writeable, write it, record that
* we have used the data, then check
* if the write worked.
*/
data = findrec()->charptr;
if (data == NULL) { /* Check it... */
msg("Unexpected EOF on archive file");
break;
}
/*
* JK - If the file is sparse, use the sparsearray
* that we created before to lseek into the new
* file the proper amount, and to see how many
* bytes we want to write at that position.
*/
/* if (head->header.linkflag == LF_SPARSE) {
off_t pos;
pos = lseek(fd, (off_t) sparsearray[sparse_ind].offset, 0);
printf("%d at %d\n", (int) pos, sparse_ind);
written = sparsearray[sparse_ind++].numbytes;
} else*/
written = endofrecs()->charptr - data;
if (written > size)
written = size;
errno = 0;
check = write(fd, data, written);
/*
* The following is in violation of strict
* typing, since the arg to userec
* should be a struct rec *. FIXME.
*/
userec((union record *)(data + written - 1));
if (check == written) continue;
/*
* Error in writing to file.
* Print it, skip to next file in archive.
*/
if(check<0)
msg_perror("couldn't write to file %s",skipcrud+head->header.name);
else
msg("could only write %d of %d bytes to file %s",written,check,skipcrud+head->header.name);
skip_file((long)(size - written));
break; /* Still do the close, mod time, chmod, etc */
}
if(f_multivol)
save_name = 0;
/* If writing to stdout, don't try to do anything
to the filename; it doesn't exist, or we don't
want to touch it anyway */
if(f_exstdout)
break;
/* if (head->header.isextended) {
register union record *exhdr;
register int i;
for (i = 0; i < 21; i++) {
long offset;
if (!exhdr->ext_hdr.sp[i].numbytes)
break;
offset = from_oct(1+12,
exhdr->ext_hdr.sp[i].offset);
written = from_oct(1+12,
exhdr->ext_hdr.sp[i].numbytes);
lseek(fd, offset, 0);
check = write(fd, data, written);
if (check == written) continue;
}
}*/
check = close(fd);
if (check < 0) {
msg_perror("Error while closing %s",skipcrud+head->header.name);
}
set_filestat:
/*
* If we are root, set the owner and group of the extracted
* file. This does what is wanted both on real Unix and on
* System V. If we are running as a user, we extract as that
* user; if running as root, we extract as the original owner.
*/
if (we_are_root || f_do_chown) {
if (chown(skipcrud+head->header.name, hstat.st_uid,
hstat.st_gid) < 0) {
msg_perror("cannot chown file %s to uid %d gid %d",skipcrud+head->header.name,hstat.st_uid,hstat.st_gid);
}
}
/*
* Set the modified time of the file.
*
* Note that we set the accessed time to "now", which
* is really "the time we started extracting files".
* unless f_gnudump is used, in which case .st_atime is used
*/
if (!f_modified) {
/* fixme if f_gnudump should set ctime too, but how? */
if(f_gnudump)
acc_upd_times[0]=hstat.st_atime;
else acc_upd_times[0] = now; /* Accessed now */
@@ -649,6 +652,28 @@ extract_archive()
skip_file((long)hstat.st_size);
break;
case LF_LONGNAME:
longp = &longname;
goto extract_long;
case LF_LONGLINK
longp = &longlink;
extract_long:
if (*longp)
free (*longp);
*longp = ck_malloc (hstat.st_size);
/* This loop is copied from the extract_file label above;
as a result, some of the variable names (like `written')
might be confusing. */
for (size = hstat.st_size;
size > 0;
size -= written)
{
}
/* We don't need to save it any longer. */