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authorGlenn L McGrath2002-12-10 00:17:22 +0000
committerGlenn L McGrath2002-12-10 00:17:22 +0000
commitb72a735a320eb60d29bc1580138c06ae7c9d321c (patch)
tree4923918fadcaac4fdaa5d4197a4e5bafd22b9b2e /archival/libunarchive/get_header_cpio.c
parent62fae308a3d92d987711d08f3d36b0ad753c2e18 (diff)
downloadbusybox-b72a735a320eb60d29bc1580138c06ae7c9d321c.zip
busybox-b72a735a320eb60d29bc1580138c06ae7c9d321c.tar.gz
rpm applet by Laurence Anderson
Diffstat (limited to 'archival/libunarchive/get_header_cpio.c')
-rw-r--r--archival/libunarchive/get_header_cpio.c185
1 files changed, 185 insertions, 0 deletions
diff --git a/archival/libunarchive/get_header_cpio.c b/archival/libunarchive/get_header_cpio.c
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--- /dev/null
+++ b/archival/libunarchive/get_header_cpio.c
@@ -0,0 +1,185 @@
+/*
+ * 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.
+ *
+ * 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.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include "unarchive.h"
+#include "libbb.h"
+
+typedef struct hardlinks_s {
+ file_header_t *entry;
+ int inode;
+ struct hardlinks_s *next;
+} hardlinks_t;
+
+extern char get_header_cpio(archive_handle_t *archive_handle)
+{
+ static hardlinks_t *saved_hardlinks = NULL;
+ static unsigned short pending_hardlinks = 0;
+ file_header_t *file_header = archive_handle->file_header;
+ char cpio_header[110];
+ int namesize;
+ char dummy[16];
+ int major, minor, nlink, inode;
+ char extract_flag;
+
+ if (pending_hardlinks) { /* Deal with any pending hardlinks */
+ hardlinks_t *tmp;
+ hardlinks_t *oldtmp;
+
+ tmp = saved_hardlinks;
+ oldtmp = NULL;
+
+ while (tmp) {
+ 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 */
+ }
+
+ /* 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);
+ }
+ archive_handle->offset += 110;
+
+ if (strncmp(&cpio_header[0], "07070", 5) != 0) {
+ printf("cpio header is %x-%x-%x-%x-%x\n",
+ cpio_header[0],
+ cpio_header[1],
+ cpio_header[2],
+ cpio_header[3],
+ cpio_header[4]);
+ error_msg_and_die("Unsupported cpio format");
+ }
+
+ if ((cpio_header[5] != '1') && (cpio_header[5] != '2')) {
+ error_msg_and_die("Unsupported cpio format, use newc or crc");
+ }
+
+ 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, &file_header->size,
+ dummy, &major, &minor, &namesize, dummy);
+
+ file_header->name = (char *) xmalloc(namesize + 1);
+ archive_xread_all(archive_handle, file_header->name, namesize); /* Read in filename */
+ file_header->name[namesize] = '\0';
+ 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) {
+ 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);
+ }
+
+ 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';
+ archive_handle->offset += file_header->size;
+ file_header->size = 0; /* Stop possible seeks in future */
+ }
+ 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));
+ 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 = xstrdup(file_header->name);
+ nlink--;
+ }
+ tmp = tmp->next;
+ }
+ if (nlink > 1) {
+ error_msg("error resolving hardlink: did you create the archive with GNU cpio 2.0-2.2?");
+ }
+ }
+ }
+ file_header->device = (major << 8) | minor;
+
+ extract_flag = FALSE;
+ if (archive_handle->filter(archive_handle) == EXIT_SUCCESS) {
+ struct stat statbuf;
+
+ extract_flag = TRUE;
+
+ /* Check if the file already exists */
+ if (lstat (file_header->name, &statbuf) == 0) {
+ if ((archive_handle->flags & ARCHIVE_EXTRACT_UNCONDITIONAL) || (statbuf.st_mtime < file_header->mtime)) {
+ /* Remove file if flag set or its older than the file to be extracted */
+ if (unlink(file_header->name) == -1) {
+ perror_msg_and_die("Couldnt remove old file");
+ }
+ } else {
+ if (! archive_handle->flags & ARCHIVE_EXTRACT_QUIET) {
+ error_msg("%s not created: newer or same age file exists", file_header->name);
+ }
+ extract_flag = FALSE;
+ }
+ }
+ archive_handle->action_header(file_header);
+ }
+
+ archive_handle->action_header(file_header);
+ if (extract_flag) {
+ archive_handle->action_data(archive_handle);
+ } else {
+ data_skip(archive_handle);
+ }
+ archive_handle->offset += file_header->size;
+ return (EXIT_SUCCESS);
+}
+