summaryrefslogtreecommitdiff
path: root/i/pc104/initrd/conf/busybox/archival/libunarchive/get_header_cpio.c
diff options
context:
space:
mode:
Diffstat (limited to 'i/pc104/initrd/conf/busybox/archival/libunarchive/get_header_cpio.c')
-rw-r--r--i/pc104/initrd/conf/busybox/archival/libunarchive/get_header_cpio.c160
1 files changed, 160 insertions, 0 deletions
diff --git a/i/pc104/initrd/conf/busybox/archival/libunarchive/get_header_cpio.c b/i/pc104/initrd/conf/busybox/archival/libunarchive/get_header_cpio.c
new file mode 100644
index 0000000..6fd1340
--- /dev/null
+++ b/i/pc104/initrd/conf/busybox/archival/libunarchive/get_header_cpio.c
@@ -0,0 +1,160 @@
+/* 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 {
+ char *name;
+ 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;
+ 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;
+
+ if (pending_hardlinks) { /* Deal with any pending hardlinks */
+ hardlinks_t *tmp, *oldtmp;
+
+ tmp = saved_hardlinks;
+ oldtmp = NULL;
+
+ file_header->link_name = file_header->name;
+ file_header->size = 0;
+
+ while (tmp) {
+ 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_name;
+
+ if (pending_hardlinks > 1) {
+ bb_error_msg("error resolving hardlink: archive made by GNU cpio 2.0-2.2?");
+ }
+
+ /* No more pending hardlinks, read next file entry */
+ pending_hardlinks = 0;
+ }
+
+ /* 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;
+ }
+
+ 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;
+ }
+ return EXIT_FAILURE;
+ }
+
+ if (S_ISLNK(file_header->mode)) {
+ file_header->link_name = 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;
+ /* 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;
+ }
+ 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;
+}