shithub: mcfs

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don't treat every file as a container

--- a/iso.c

+++ b/iso.c

@@ -1,6 +1,7 @@

 #include <u.h>

 #include <libc.h>

 #include <bio.h>

+#include <ctype.h>

 #define MIN(a,b) ((a)<=(b)?(a):(b))

@@ -1483,6 +1484,9 @@

 		b->version = d[0];

 		b->flags = d[1]<<16 | d[2]<<8 | d[3];

 		b->dstart += 4;

+	}else if(!isalnum(b->type&0xff) || !isalnum((b->type>>8)&0xff) || !isalnum((b->type>>16)&0xff) || !isalnum((b->type>>24)&0xff)){

+		werrstr("not an ISO container");

+		return -1;

 	}

 	b->dsz -= b->dstart - start;