From 2ada69fe971ecc8881d5eb01dfbf337996472c40 Mon Sep 17 00:00:00 2001
From: Tobias Klauser <tklauser@distanz.ch>
Date: Tue, 1 Jul 2008 16:45:28 +0200
Subject: Initial import

---
 cursor.hpp | 71 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 71 insertions(+)
 create mode 100755 cursor.hpp

(limited to 'cursor.hpp')

diff --git a/cursor.hpp b/cursor.hpp
new file mode 100755
index 0000000..eca4ac0
--- /dev/null
+++ b/cursor.hpp
@@ -0,0 +1,71 @@
+/* $Id: cursor.hpp,v 1.4 2006/11/05 04:42:43 ganzhorn Exp $
+ * This file is part of lfhex.
+ * Copyright (C) 2006 Salem Ganzhorn <eyekode@yahoo.com>
+ *
+ * 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 version 2.
+ *
+ * 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., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+ */
+
+#ifndef _CURSOR_HPP_
+#define _CURSOR_HPP_
+
+#include <sys/types.h>
+#include <limits.h>
+#include <stdexcept>
+
+#ifdef _LARGEFILE_SOURCE
+#define MAX_OFFSET LONG_LONG_MAX
+#else
+#define MAX_OFFSET LONG_MAX
+#endif
+
+class  Cursor {
+public:
+  Cursor( off_t byteOffset = 0,
+	  off_t charOffset = 0,
+	  off_t low        = 0,
+	  off_t high       = 1,
+	  off_t charsPerByte = 2 ); // defaults to hex
+  Cursor( const Cursor& c);
+
+  off_t incrByChar( off_t n );
+  off_t incrByByte( off_t n );
+  off_t decrByChar( off_t n );
+  off_t decrByByte( off_t n );
+
+  off_t   byteOffset() const; //returns the current byte offset
+  off_t   charOffset() const; //returns the current char offset. (relative)
+  off_t   charOffsetAbsolute() const; //returns the current absolute offset.
+
+  bool   setRange( off_t low, off_t high );
+  // setCharsPerByte:
+  // sideEffect: sets charOffset to min(_charsPerByte-1,_charOffset)
+  off_t   setCharsPerByte( off_t charsPerByte );
+  void    setOffset( off_t byteOffset, off_t charOffset );
+
+protected:
+  // performs: dst = src; and clamps the value to [low,high)
+  void assignClamped(off_t& dst,off_t src,off_t low,off_t high);
+
+  enum {
+    OutOfRange = -1,
+  };
+protected:
+  off_t _byteOffset;
+  off_t _charOffset;
+  off_t _low;
+  off_t _high;
+  off_t _charsPerByte;
+};
+
+#endif
-- 
cgit v1.2.3-54-g00ecf