From dd318ef67b0c683c8306da0abf806e99cff346e9 Mon Sep 17 00:00:00 2001
From: Mikko Rasa <tdb@tdb.fi>
Date: Sat, 16 Aug 2008 08:50:23 +0000
Subject: [PATCH] Add Filtered class Make do_write and do_read protected
 everywhere so Filtered can use the base class versions

---
 source/buffered.h |  1 +
 source/console.h  |  2 +-
 source/file.h     |  5 ++++
 source/filtered.h | 66 +++++++++++++++++++++++++++++++++++++++++++++++
 source/pipe.h     |  1 +
 5 files changed, 74 insertions(+), 1 deletion(-)
 create mode 100644 source/filtered.h

diff --git a/source/buffered.h b/source/buffered.h
index 092be19..8d52d1d 100644
--- a/source/buffered.h
+++ b/source/buffered.h
@@ -35,6 +35,7 @@ public:
 	unsigned get_current_size() const;
 private:
 	void set_op(Mode);
+protected:
 	unsigned do_write(const char *, unsigned);
 	unsigned do_read(char *, unsigned);
 };
diff --git a/source/console.h b/source/console.h
index 439ee7b..06fa603 100644
--- a/source/console.h
+++ b/source/console.h
@@ -40,7 +40,7 @@ public:
 	void set_line_buffer(bool);
 
 	virtual Handle get_event_handle();
-private:
+protected:
 	virtual unsigned do_write(const char *, unsigned);
 	virtual unsigned do_read(char *, unsigned);
 public:
diff --git a/source/file.h b/source/file.h
index f2271d0..df5105d 100644
--- a/source/file.h
+++ b/source/file.h
@@ -9,6 +9,8 @@ Distributed under the LGPL
 
 #include <string>
 #include "base.h"
+#include "buffered.h"
+#include "filtered.h"
 #include "seek.h"
 
 namespace Msp {
@@ -47,6 +49,7 @@ private:
 	Handle handle;
 
 	void              check_access(Mode) const;
+protected:
 	virtual unsigned  do_write(const char *, unsigned);
 	virtual unsigned  do_read(char *, unsigned);
 };
@@ -60,6 +63,8 @@ inline File::CreateMode operator&(File::CreateMode m, File::CreateMode n)
 inline File::CreateMode operator~(File::CreateMode m)
 { return File::CreateMode(~(int)m); }
 
+typedef Filtered<File, Buffered> BufferedFile;
+
 } // namespace IO
 } // namespace Msp
 
diff --git a/source/filtered.h b/source/filtered.h
new file mode 100644
index 0000000..0575175
--- /dev/null
+++ b/source/filtered.h
@@ -0,0 +1,66 @@
+/* $Id$
+
+This file is part of libmspio
+Copyright © 2008  Mikko Rasa, Mikkosoft Productions
+Distributed under the LGPL
+*/
+
+#ifndef MSP_IO_FILTERED_H_
+#define MSP_IO_FILTERED_H_
+
+namespace Msp {
+namespace IO {
+
+template<typename B, typename F>
+class Filtered: public B
+{
+private:
+	struct Activator
+	{
+		Filtered &f;
+
+		Activator(Filtered &f_): f(f_) { f.active=true; }
+		~Activator() { f.active=false; }
+	};
+
+	F filter;
+	bool active;
+
+public:
+	Filtered(): filter(*this), active(false) { }
+
+	template<typename A0>
+	Filtered(A0 a0): B(a0), filter(*this), active(false) { }
+
+	template<typename A0, typename A1>
+	Filtered(A0 a0, A1 a1): B(a0, a1), filter(*this), active(false) { }
+
+	F &get_filter() { return filter; }
+protected:
+	virtual unsigned do_write(const char *b, unsigned s)
+	{
+		if(!active)
+		{
+			Activator a(*this);
+			return filter.write(b, s);
+		}
+		else
+			return B::do_write(b, s);
+	}
+
+	virtual unsigned do_read(char *b, unsigned s)
+	{
+		if(!active)
+		{
+			Activator a(*this);
+			return filter.read(b, s);
+		}
+		else
+			return B::do_read(b, s);
+	}
+};
+
+} // namespace IO
+} // namespace Msp
+
+#endif
diff --git a/source/pipe.h b/source/pipe.h
index e8e1f53..2ad83f8 100644
--- a/source/pipe.h
+++ b/source/pipe.h
@@ -31,6 +31,7 @@ private:
 	char       *buf_next;
 #endif
 
+protected:
 	unsigned do_write(const char *, unsigned);
 	unsigned do_read(char *, unsigned);
 };
-- 
2.43.0