*** empty log message ***

1 files changed, 136 insertions, 0 deletions

diff --git a/archival/libunarchive/get_header_cpio.c b/archival/libunarchive/get_header_cpio.c
new file mode 100644
index 000000000..a2136e441
--- /dev/null
+++ b/archival/libunarchive/get_header_cpio.c
@@ -0,0 +1,136 @@
+/*
+ *  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 "unarchive.h"
+#include "libbb.h"
+
+struct hardlinks {
+	file_header_t *entry;
+	int inode;
+	struct hardlinks *next;
+};
+
+file_header_t *get_header_cpio(FILE *src_stream)
+{
+	file_header_t *cpio_entry = NULL;
+	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;
+
+	if (pending_hardlinks) { /* Deal with any pending hardlinks */
+		struct hardlinks *tmp = saved_hardlinks, *oldtmp = NULL;
+		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);
+			}
+			oldtmp = tmp;
+			tmp = tmp->next;
+		}
+		pending_hardlinks = 0; /* No more pending hardlinks, read next file entry */
+	}
+  
+	/* 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);
+		}
+		if (ferror(src_stream) || feof(src_stream)) {
+			perror_msg("Stream error");
+			return(NULL);
+		}
+	}
+	return(cpio_entry);
+}
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