busybox/archival/libunarchive/get_header_cpio.c
Rob Landley d921b2ecc0 Remove bb_ prefixes from xfuncs.c (and a few other places), consolidate
things like xasprintf() into xfuncs.c, remove xprint_file_by_name() (it only
had one user), clean up lots of #includes...  General cleanup pass.  What I've
been doing for the last couple days.

And it conflicts!  I've removed httpd.c from this checkin due to somebody else
touching that file.  It builds for me.  I have to catch a bus.  (Now you know
why I'm looking forward to Mercurial.)
2006-08-03 15:41:12 +00:00

146 lines
4.2 KiB
C

/* vi: set sw=4 ts=4: */
/* Copyright 2002 Laurence Anderson
*
* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
*/
#include "libbb.h"
#include "unarchive.h"
typedef struct hardlinks_s {
file_header_t *entry;
int inode;
struct hardlinks_s *next;
} hardlinks_t;
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;
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 */
}
/* There can be padding before archive header */
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;
}
file_header->name = (char *) 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);
}
if (S_ISLNK(file_header->mode)) {
file_header->link_name = (char *) xzalloc(file_header->size + 1);
xread(archive_handle->src_fd, file_header->link_name, file_header->size);
archive_handle->offset += file_header->size;
file_header->size = 0; /* Stop possible seeks in future */
} else {
file_header->link_name = 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;
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) {
bb_error_msg("error resolving hardlink: did you create the archive with GNU cpio 2.0-2.2?");
}
}
}
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_name);
return (EXIT_SUCCESS);
}