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diff --git a/backend/plustek-pp_dbg.h b/backend/plustek-pp_dbg.h
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+/** @file plustek-pp_dbg.c
+ *  @brief definition of some debug macros
+ *
+ * Copyright (C) 2000-2004 Gerhard Jaeger <gerhard@gjaeger.de>
+ *
+ * This file is part of the SANE package.
+ *
+ * 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
+ * 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.
+ *
+ * As a special exception, the authors of SANE give permission for
+ * additional uses of the libraries contained in this release of SANE.
+ *
+ * The exception is that, if you link a SANE library with other files
+ * to produce an executable, this does not by itself cause the
+ * resulting executable to be covered by the GNU General Public
+ * License.  Your use of that executable is in no way restricted on
+ * account of linking the SANE library code into it.
+ *
+ * This exception does not, however, invalidate any other reasons why
+ * the executable file might be covered by the GNU General Public
+ * License.
+ *
+ * If you submit changes to SANE to the maintainers to be included in
+ * a subsequent release, you agree by submitting the changes that
+ * those changes may be distributed with this exception intact.
+ *
+ * If you write modifications of your own for SANE, it is your choice
+ * whether to permit this exception to apply to your modifications.
+ * If you do not wish that, delete this exception notice.
+ * <hr>
+ */
+#ifndef __DEBUG_H__
+#define __DEBUG_H__
+
+/* uncomment this to have an SW-simulatet 98001 device - don't expect to scan*/
+/* #define _ASIC_98001_SIM */
+
+/*
+ * the print macros
+ */
+#ifdef __KERNEL__
+# define _PRINT	printk
+#endif
+
+/*
+ * some debug definitions
+ */
+#ifdef DEBUG
+# ifndef __KERNEL__
+#  include <assert.h>
+#  define _ASSERT(x) assert(x)
+# else
+#  define _ASSERT(x)
+# endif
+
+# ifndef DBG
+#  define DBG(level, msg, args...)		if ((dbg_level) & (level)) {	\
+											_PRINT(msg, ##args);		\
+										}
+# endif
+#else
+# define _ASSERT(x)
+# ifndef DBG
+#  define DBG(level, msg, args...)
+# endif
+#endif
+
+/* different debug level */
+#define DBG_LOW         0x01
+#define DBG_MEDIUM      0x02
+#define DBG_HIGH        0x04
+#define DBG_HELPERS     0x08
+#define DBG_TIMEOUT     0x10
+#define DBG_SCAN        0x20
+#define DBG_IO          0x40
+#define DBG_IOF         0x80
+#define DBG_ALL         0xFF
+
+/*
+ * standard debug level
+ */
+#ifdef DEBUG
+static int dbg_level=(DBG_ALL & ~(DBG_IO | DBG_IOF));
+#endif
+
+#endif /* guard __DEBUG_H__ */
+
+/* END PLUSTEK-PP_DBG.H .....................................................*/