[iso] initial ISO image support (EXPERIMENTAL)

* from libcdio: http://www.gnu.org/software/libcdio/

src/libcdio/driver/portable.h

@@ -0,0 +1,54 @@
+/*
+  Copyright (C) 2006, 2008, 2011 Rocky Bernstein <rocky@gnu.org>
+
+  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 3 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 General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+/* 
+   This file contains definitions to fill in for differences or
+   deficiencies to OS or compiler irregularities.  If this file is
+   included other routines can be more portable.
+*/
+
+#ifndef __CDIO_PORTABLE_H__
+#define __CDIO_PORTABLE_H__
+
+#if defined(HAVE_CONFIG_H) && !defined(__CDIO_CONFIG_H__)
+# include "config.h"
+# define __CDIO_CONFIG_H__ 1
+#endif
+
+#if !defined(HAVE_FTRUNCATE)
+# if defined (_WIN32)
+#  define ftruncate chsize
+# endif
+#endif /*HAVE_FTRUNCATE*/
+
+#if !defined(HAVE_SNPRINTF)
+# if defined (_MSC_VER)
+#  define snprintf _snprintf
+# endif
+#endif /*HAVE_SNPRINTF*/
+
+#if !defined(HAVE_VSNPRINTF)
+# if defined (_MSC_VER)
+#  define vsnprintf _vsnprintf
+# endif
+#endif /*HAVE_SNPRINTF*/
+
+#if !defined(HAVE_DRAND48) && defined(HAVE_RAND)
+# define drand48()   (rand() / (double)RAND_MAX)
+#endif
+
+#endif /* __CDIO_PORTABLE_H__ */