-/*
- * 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 "unarchive.h"
#include "libbb.h"
+#include "unarchive.h"
-struct hardlinks {
- file_header_t *entry;
+typedef struct hardlinks_s {
+ char *name;
int inode;
- struct hardlinks *next;
-};
+ struct hardlinks_s *next;
+} hardlinks_t;
-file_header_t *get_header_cpio(FILE *src_stream)
+char get_header_cpio(archive_handle_t *archive_handle)
{
- file_header_t *cpio_entry = NULL;
+ static hardlinks_t *saved_hardlinks = NULL;
+ static unsigned pending_hardlinks = 0;
+ static int inode;
+
+ file_header_t *file_header = archive_handle->file_header;
char cpio_header[110];
int namesize;
- char dummy[16];
- int major, minor, nlink, inode;
- static struct hardlinks *saved_hardlinks = NULL;
- static int pending_hardlinks = 0;
+ char dummy[16];
+ int major, minor, nlink;
if (pending_hardlinks) { /* Deal with any pending hardlinks */
- struct hardlinks *tmp = saved_hardlinks, *oldtmp = NULL;
+ hardlinks_t *tmp, *oldtmp;
+
+ tmp = saved_hardlinks;
+ oldtmp = NULL;
+
+ file_header->link_target = file_header->name;
+ file_header->size = 0;
+
while (tmp) {
- if (tmp->entry->link_name) { /* Found a hardlink ready to be extracted */
- cpio_entry = tmp->entry;
- if (oldtmp) oldtmp->next = tmp->next; /* Remove item from linked list */
- else saved_hardlinks = tmp->next;
- free(tmp);
- return (cpio_entry);
+ if (tmp->inode != inode) {
+ tmp = tmp->next;
+ continue;
+ }
+
+ file_header->name = tmp->name;
+
+ if (archive_handle->filter(archive_handle) == EXIT_SUCCESS) {
+ archive_handle->action_data(archive_handle);
+ archive_handle->action_header(archive_handle->file_header);
}
+
+ pending_hardlinks--;
+
oldtmp = tmp;
tmp = tmp->next;
+ free(oldtmp->name);
+ free(oldtmp);
+ if (oldtmp == saved_hardlinks)
+ saved_hardlinks = tmp;
+ }
+
+ file_header->name = file_header->link_target;
+
+ if (pending_hardlinks > 1) {
+ bb_error_msg("error resolving hardlink: archive made by GNU cpio 2.0-2.2?");
}
- pending_hardlinks = 0; /* No more pending hardlinks, read next file entry */
+
+ /* No more pending hardlinks, read next file entry */
+ pending_hardlinks = 0;
}
-
+
/* There can be padding before archive header */
- seek_sub_file(src_stream, (4 - (archive_offset % 4)) % 4);
- if (fread(cpio_header, 1, 110, src_stream) == 110) {
- archive_offset += 110;
- if (strncmp(cpio_header, "07070", 5) != 0) {
- error_msg("Unsupported format or invalid magic");
- return(NULL);
- }
- switch (cpio_header[5]) {
- case '2': /* "crc" header format */
- /* Doesnt do the crc check yet */
- case '1': /* "newc" header format */
- cpio_entry = (file_header_t *) xcalloc(1, sizeof(file_header_t));
- sscanf(cpio_header, "%6c%8x%8x%8x%8x%8x%8lx%8lx%16c%8x%8x%8x%8c",
- dummy, &inode, (unsigned int*)&cpio_entry->mode,
- (unsigned int*)&cpio_entry->uid, (unsigned int*)&cpio_entry->gid,
- &nlink, &cpio_entry->mtime, &cpio_entry->size,
- dummy, &major, &minor, &namesize, dummy);
-
- cpio_entry->name = (char *) xcalloc(1, namesize);
- fread(cpio_entry->name, 1, namesize, src_stream); /* Read in filename */
- archive_offset += namesize;
- /* Skip padding before file contents */
- seek_sub_file(src_stream, (4 - (archive_offset % 4)) % 4);
- if (strcmp(cpio_entry->name, "TRAILER!!!") == 0) {
- printf("%d blocks\n", (int) (archive_offset % 512 ? (archive_offset / 512) + 1 : archive_offset / 512)); /* Always round up */
- if (saved_hardlinks) { /* Bummer - we still have unresolved hardlinks */
- struct hardlinks *tmp = saved_hardlinks, *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(NULL);
- }
-
- if (S_ISLNK(cpio_entry->mode)) {
- cpio_entry->link_name = (char *) xcalloc(1, cpio_entry->size + 1);
- fread(cpio_entry->link_name, 1, cpio_entry->size, src_stream);
- archive_offset += cpio_entry->size;
- cpio_entry->size = 0; /* Stop possiable seeks in future */
- }
- if (nlink > 1 && !S_ISDIR(cpio_entry->mode)) {
- if (cpio_entry->size == 0) { /* Put file on a linked list for later */
- struct hardlinks *new = xmalloc(sizeof(struct hardlinks));
- new->next = saved_hardlinks;
- new->inode = inode;
- new->entry = cpio_entry;
- saved_hardlinks = new;
- return(get_header_cpio(src_stream)); /* Recurse to next file */
- } else { /* Found the file with data in */
- struct hardlinks *tmp = saved_hardlinks;
- pending_hardlinks = 1;
- while (tmp) {
- if (tmp->inode == inode) {
- tmp->entry->link_name = xstrdup(cpio_entry->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?");
- }
- }
- cpio_entry->device = (major << 8) | minor;
- break;
- default:
- error_msg("Unsupported format");
- return(NULL);
+ data_align(archive_handle, 4);
+
+ if (archive_xread_all_eof(archive_handle, (unsigned char*)cpio_header, 110) == 0) {
+ return EXIT_FAILURE;
+ }
+ 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");
+ }
+
+ {
+ 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;
+ }
+
+ free(file_header->name);
+ 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) {
+ /* Always round up */
+ printf("%d blocks\n", (int) (archive_handle->offset % 512 ?
+ archive_handle->offset / 512 + 1 :
+ archive_handle->offset / 512
+ ));
+ 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->name);
+ oldtmp = tmp;
+ tmp = tmp->next;
+ free(oldtmp->name);
+ free(oldtmp);
+ }
+ saved_hardlinks = NULL;
+ pending_hardlinks = 0;
}
- if (ferror(src_stream) || feof(src_stream)) {
- perror_msg("Stream error");
- return(NULL);
+ return EXIT_FAILURE;
+ }
+
+ if (S_ISLNK(file_header->mode)) {
+ 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));
+ new->next = saved_hardlinks;
+ new->inode = inode;
+ /* name current allocated, freed later */
+ new->name = file_header->name;
+ file_header->name = NULL;
+ saved_hardlinks = new;
+ return EXIT_SUCCESS; /* Skip this one */
}
+ /* Found the file with data in */
+ pending_hardlinks = nlink;
}
- return(cpio_entry);
-}
+ 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);
+ } else {
+ data_skip(archive_handle);
+ }
+
+ archive_handle->offset += file_header->size;
+
+ free(file_header->link_target);
+
+ return EXIT_SUCCESS;
+}
projects / oweals / busybox.git / blobdiff