-/*
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
+/* vi: set sw=4 ts=4: */
+/* Copyright 2002 Laurence Anderson
*
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU Library General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
*/
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <unistd.h>
-#include "unarchive.h"
#include "libbb.h"
+#include "unarchive.h"
typedef struct hardlinks_s {
- file_header_t *entry;
- int inode;
struct hardlinks_s *next;
+ int inode; /* TODO: must match maj/min too! */
+ int mode ;
+ int mtime; /* These three are useful only in corner case */
+ int uid ; /* of hardlinks with zero size body */
+ int gid ;
+ char name[1];
} hardlinks_t;
-extern char get_header_cpio(archive_handle_t *archive_handle)
+char FAST_FUNC get_header_cpio(archive_handle_t *archive_handle)
{
static hardlinks_t *saved_hardlinks = NULL;
- static unsigned short pending_hardlinks = 0;
+ static hardlinks_t *saved_hardlinks_created = NULL;
+
file_header_t *file_header = archive_handle->file_header;
char cpio_header[110];
- int namesize;
char dummy[16];
- int major, minor, nlink, inode;
-
- if (pending_hardlinks) { /* Deal with any pending hardlinks */
- hardlinks_t *tmp;
- hardlinks_t *oldtmp;
-
- tmp = saved_hardlinks;
- oldtmp = NULL;
-
- while (tmp) {
- bb_error_msg_and_die("need to fix this\n");
- if (tmp->entry->link_name) { /* Found a hardlink ready to be extracted */
- file_header = tmp->entry;
- if (oldtmp) {
- oldtmp->next = tmp->next; /* Remove item from linked list */
- } else {
- saved_hardlinks = tmp->next;
- }
- free(tmp);
- continue;
- }
- oldtmp = tmp;
- tmp = tmp->next;
- }
- pending_hardlinks = 0; /* No more pending hardlinks, read next file entry */
- }
+ int namesize;
+ int major, minor, nlink, mode, inode;
+ unsigned size, uid, gid, mtime;
/* There can be padding before archive header */
data_align(archive_handle, 4);
- if (archive_xread_all_eof(archive_handle, cpio_header, 110) == 0) {
- return(EXIT_FAILURE);
+ if (archive_xread_all_eof(archive_handle, (unsigned char*)cpio_header, 110) == 0) {
+ goto create_hardlinks;
}
archive_handle->offset += 110;
- if ((strncmp(&cpio_header[0], "07070", 5) != 0) || ((cpio_header[5] != '1') && (cpio_header[5] != '2'))) {
- bb_error_msg_and_die("Unsupported cpio format, use newc or crc");
+ if (strncmp(&cpio_header[0], "07070", 5) != 0
+ || (cpio_header[5] != '1' && cpio_header[5] != '2')
+ ) {
+ bb_error_msg_and_die("unsupported cpio format, use newc or crc");
}
- {
- unsigned long tmpsize;
- sscanf(cpio_header, "%6c%8x%8x%8x%8x%8x%8lx%8lx%16c%8x%8x%8x%8c",
- dummy, &inode, (unsigned int*)&file_header->mode,
- (unsigned int*)&file_header->uid, (unsigned int*)&file_header->gid,
- &nlink, &file_header->mtime, &tmpsize,
- dummy, &major, &minor, &namesize, dummy);
- file_header->size = tmpsize;
- }
-
- file_header->name = (char *) xmalloc(namesize + 1);
- archive_xread_all(archive_handle, file_header->name, namesize); /* Read in filename */
- file_header->name[namesize] = '\0';
+ sscanf(cpio_header + 6,
+ "%8x" "%8x" "%8x" "%8x"
+ "%8x" "%8x" "%8x" /*maj,min:*/ "%16c"
+ /*rmaj,rmin:*/"%8x" "%8x" "%8x" /*chksum:*/ "%8c",
+ &inode, &mode, &uid, &gid,
+ &nlink, &mtime, &size, dummy,
+ &major, &minor, &namesize, dummy);
+ file_header->mode = mode;
+ file_header->uid = uid;
+ file_header->gid = gid;
+ file_header->mtime = mtime;
+ file_header->size = size;
+
+ file_header->name = xzalloc(namesize + 1);
+ /* Read in filename */
+ xread(archive_handle->src_fd, file_header->name, namesize);
archive_handle->offset += namesize;
/* Update offset amount and skip padding before file contents */
data_align(archive_handle, 4);
if (strcmp(file_header->name, "TRAILER!!!") == 0) {
- printf("%d blocks\n", (int) (archive_handle->offset % 512 ? (archive_handle->offset / 512) + 1 : archive_handle->offset / 512)); /* Always round up */
- if (saved_hardlinks) { /* Bummer - we still have unresolved hardlinks */
- hardlinks_t *tmp = saved_hardlinks;
- hardlinks_t *oldtmp = NULL;
- while (tmp) {
- bb_error_msg("%s not created: cannot resolve hardlink", tmp->entry->name);
- oldtmp = tmp;
- tmp = tmp->next;
- free (oldtmp->entry->name);
- free (oldtmp->entry);
- free (oldtmp);
- }
- saved_hardlinks = NULL;
- pending_hardlinks = 0;
- }
- return(EXIT_FAILURE);
+ /* Always round up. ">> 9" divides by 512 */
+ printf("%"OFF_FMT"u blocks\n", (archive_handle->offset + 511) >> 9);
+ goto create_hardlinks;
}
if (S_ISLNK(file_header->mode)) {
- file_header->link_name = (char *) xmalloc(file_header->size + 1);
- archive_xread_all(archive_handle, file_header->link_name, file_header->size);
- file_header->link_name[file_header->size] = '\0';
+ file_header->link_target = xzalloc(file_header->size + 1);
+ xread(archive_handle->src_fd, file_header->link_target, file_header->size);
archive_handle->offset += file_header->size;
file_header->size = 0; /* Stop possible seeks in future */
+ } else {
+ file_header->link_target = NULL;
}
- if (nlink > 1 && !S_ISDIR(file_header->mode)) {
- if (file_header->size == 0) { /* Put file on a linked list for later */
- hardlinks_t *new = xmalloc(sizeof(hardlinks_t));
+
+// TODO: data_extract_all can't deal with hardlinks to non-files...
+// (should be !S_ISDIR instead of S_ISREG here)
+
+ if (nlink > 1 && S_ISREG(file_header->mode)) {
+ hardlinks_t *new = xmalloc(sizeof(*new) + namesize);
+ new->inode = inode;
+ new->mode = mode ;
+ new->mtime = mtime;
+ new->uid = uid ;
+ new->gid = gid ;
+ strcpy(new->name, file_header->name);
+ /* Put file on a linked list for later */
+ if (size == 0) {
new->next = saved_hardlinks;
- new->inode = inode;
- new->entry = file_header;
saved_hardlinks = new;
- return(EXIT_SUCCESS); // Skip this one
- } else { /* Found the file with data in */
- hardlinks_t *tmp = saved_hardlinks;
- pending_hardlinks = 1;
- while (tmp) {
- if (tmp->inode == inode) {
- tmp->entry->link_name = bb_xstrdup(file_header->name);
- nlink--;
- }
- tmp = tmp->next;
- }
- if (nlink > 1) {
- bb_error_msg("error resolving hardlink: did you create the archive with GNU cpio 2.0-2.2?");
- }
+ return EXIT_SUCCESS; /* Skip this one */
+ /* TODO: this breaks cpio -t (it does not show hardlinks) */
}
+ new->next = saved_hardlinks_created;
+ saved_hardlinks_created = new;
}
- file_header->device = (major << 8) | minor;
+ file_header->device = makedev(major, minor);
if (archive_handle->filter(archive_handle) == EXIT_SUCCESS) {
archive_handle->action_data(archive_handle);
- archive_handle->action_header(archive_handle->file_header);
+ archive_handle->action_header(file_header);
} else {
data_skip(archive_handle);
}
archive_handle->offset += file_header->size;
- return (EXIT_SUCCESS);
+
+ free(file_header->link_target);
+ free(file_header->name);
+ file_header->link_target = NULL;
+ file_header->name = NULL;
+
+ return EXIT_SUCCESS;
+
+ create_hardlinks:
+ free(file_header->link_target);
+ free(file_header->name);
+
+ while (saved_hardlinks) {
+ hardlinks_t *cur;
+ hardlinks_t *make_me = saved_hardlinks;
+ saved_hardlinks = make_me->next;
+
+ memset(file_header, 0, sizeof(*file_header));
+ file_header->name = make_me->name;
+ file_header->mode = make_me->mode;
+ /*file_header->size = 0;*/
+
+ /* Try to find a file we are hardlinked to */
+ cur = saved_hardlinks_created;
+ while (cur) {
+ /* TODO: must match maj/min too! */
+ if (cur->inode == make_me->inode) {
+ file_header->link_target = cur->name;
+ /* link_target != NULL, size = 0: "I am a hardlink" */
+ if (archive_handle->filter(archive_handle) == EXIT_SUCCESS)
+ archive_handle->action_data(archive_handle);
+ free(make_me);
+ goto next_link;
+ }
+ }
+ /* Oops... no file with such inode was created... do it now
+ * (happens when hardlinked files are empty (zero length)) */
+ file_header->mtime = make_me->mtime;
+ file_header->uid = make_me->uid ;
+ file_header->gid = make_me->gid ;
+ if (archive_handle->filter(archive_handle) == EXIT_SUCCESS)
+ archive_handle->action_data(archive_handle);
+ /* Move to the list of created hardlinked files */
+ make_me->next = saved_hardlinks_created;
+ saved_hardlinks_created = make_me;
+ next_link: ;
+ }
+
+ while (saved_hardlinks_created) {
+ hardlinks_t *p = saved_hardlinks_created;
+ saved_hardlinks_created = p->next;
+ free(p);
+ }
+
+ return EXIT_FAILURE; /* "No more files to process" */
}
projects / oweals / busybox.git / blobdiff