136 lines
4.7 KiB
C
136 lines
4.7 KiB
C
/*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Library General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "unarchive.h"
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#include "libbb.h"
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struct hardlinks {
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file_header_t *entry;
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int inode;
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struct hardlinks *next;
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};
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file_header_t *get_header_cpio(FILE *src_stream)
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{
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file_header_t *cpio_entry = NULL;
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char cpio_header[110];
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int namesize;
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char dummy[16];
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int major, minor, nlink, inode;
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static struct hardlinks *saved_hardlinks = NULL;
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static int pending_hardlinks = 0;
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if (pending_hardlinks) { /* Deal with any pending hardlinks */
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struct hardlinks *tmp = saved_hardlinks, *oldtmp = NULL;
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while (tmp) {
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if (tmp->entry->link_name) { /* Found a hardlink ready to be extracted */
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cpio_entry = tmp->entry;
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if (oldtmp) oldtmp->next = tmp->next; /* Remove item from linked list */
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else saved_hardlinks = tmp->next;
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free(tmp);
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return (cpio_entry);
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}
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oldtmp = tmp;
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tmp = tmp->next;
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}
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pending_hardlinks = 0; /* No more pending hardlinks, read next file entry */
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}
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/* There can be padding before archive header */
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seek_sub_file(src_stream, (4 - (archive_offset % 4)) % 4);
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if (fread(cpio_header, 1, 110, src_stream) == 110) {
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archive_offset += 110;
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if (strncmp(cpio_header, "07070", 5) != 0) {
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error_msg("Unsupported format or invalid magic");
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return(NULL);
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}
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switch (cpio_header[5]) {
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case '2': /* "crc" header format */
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/* Doesnt do the crc check yet */
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case '1': /* "newc" header format */
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cpio_entry = (file_header_t *) xcalloc(1, sizeof(file_header_t));
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sscanf(cpio_header, "%6c%8x%8x%8x%8x%8x%8lx%8lx%16c%8x%8x%8x%8c",
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dummy, &inode, (unsigned int*)&cpio_entry->mode,
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(unsigned int*)&cpio_entry->uid, (unsigned int*)&cpio_entry->gid,
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&nlink, &cpio_entry->mtime, &cpio_entry->size,
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dummy, &major, &minor, &namesize, dummy);
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cpio_entry->name = (char *) xcalloc(1, namesize);
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fread(cpio_entry->name, 1, namesize, src_stream); /* Read in filename */
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archive_offset += namesize;
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/* Skip padding before file contents */
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seek_sub_file(src_stream, (4 - (archive_offset % 4)) % 4);
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if (strcmp(cpio_entry->name, "TRAILER!!!") == 0) {
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printf("%d blocks\n", (int) (archive_offset % 512 ? (archive_offset / 512) + 1 : archive_offset / 512)); /* Always round up */
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if (saved_hardlinks) { /* Bummer - we still have unresolved hardlinks */
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struct hardlinks *tmp = saved_hardlinks, *oldtmp = NULL;
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while (tmp) {
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error_msg("%s not created: cannot resolve hardlink", tmp->entry->name);
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oldtmp = tmp;
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tmp = tmp->next;
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free (oldtmp->entry->name);
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free (oldtmp->entry);
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free (oldtmp);
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}
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saved_hardlinks = NULL;
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pending_hardlinks = 0;
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}
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return(NULL);
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}
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if (S_ISLNK(cpio_entry->mode)) {
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cpio_entry->link_name = (char *) xcalloc(1, cpio_entry->size + 1);
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fread(cpio_entry->link_name, 1, cpio_entry->size, src_stream);
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archive_offset += cpio_entry->size;
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cpio_entry->size = 0; /* Stop possiable seeks in future */
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}
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if (nlink > 1 && !S_ISDIR(cpio_entry->mode)) {
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if (cpio_entry->size == 0) { /* Put file on a linked list for later */
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struct hardlinks *new = xmalloc(sizeof(struct hardlinks));
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new->next = saved_hardlinks;
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new->inode = inode;
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new->entry = cpio_entry;
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saved_hardlinks = new;
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return(get_header_cpio(src_stream)); /* Recurse to next file */
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} else { /* Found the file with data in */
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struct hardlinks *tmp = saved_hardlinks;
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pending_hardlinks = 1;
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while (tmp) {
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if (tmp->inode == inode) {
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tmp->entry->link_name = xstrdup(cpio_entry->name);
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nlink--;
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}
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tmp = tmp->next;
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}
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if (nlink > 1) error_msg("error resolving hardlink: did you create the archive with GNU cpio 2.0-2.2?");
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}
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}
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cpio_entry->device = (major << 8) | minor;
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break;
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default:
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error_msg("Unsupported format");
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return(NULL);
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}
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if (ferror(src_stream) || feof(src_stream)) {
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perror_msg("Stream error");
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return(NULL);
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}
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}
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return(cpio_entry);
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} |