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$NetBSD: patch-al,v 1.2 2009/04/25 23:46:47 gdt Exp $
--- zooext.c.orig 1993-05-01 05:58:50.000000000 +0200
+++ zooext.c
@@ -89,6 +89,7 @@ int alloc_size;
#endif
struct direntry direntry; /* directory entry */
int first_dir = 1; /* first dir entry seen? */
+unsigned long zoo_pointer = 0; /* Track our position in the file */
static char extract_ver[] = "Zoo %d.%d is needed to extract %s.\n";
static char no_space[] = "Insufficient disk space to extract %s.\n";
@@ -169,6 +170,9 @@ if (fiz_ofs != 0L) { /* i
exit_status = 1;
}
zooseek (zoo_file, zoo_header.zoo_start, 0); /* seek to where data begins */
+
+ /* Begin tracking our position in the file */
+ zoo_pointer = zoo_header.zoo_start;
}
#ifndef PORTABLE
@@ -597,6 +601,12 @@ bit 23==0 and bit 22==1. */
} /* end if */
loop_again:
+
+ /* Make sure we are not seeking to already processed data */
+ if (next_ptr <= zoo_pointer)
+ prterror ('f', "ZOO chain structure is corrupted\n");
+ zoo_pointer = next_ptr;
+
zooseek (zoo_file, next_ptr, 0); /* ..seek to next dir entry */
} /* end while */
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