From a83e9babede7ab5bc8e1ac6c7ee3784b91bd8452 Mon Sep 17 00:00:00 2001
From: Mike Buland <eichlan@xagasoft.com>
Date: Wed, 4 Aug 2010 15:17:11 +0000
Subject: Alright, NullStream compiles and works.

---
 src/nullstream.cpp | 114 +++++++++++++++++++++++++++++++++++++++++++----------
 src/nullstream.h   |  19 +++++++++
 2 files changed, 113 insertions(+), 20 deletions(-)

diff --git a/src/nullstream.cpp b/src/nullstream.cpp
index 364b58a..40c636c 100644
--- a/src/nullstream.cpp
+++ b/src/nullstream.cpp
@@ -1,6 +1,8 @@
 #include "bu/nullstream.h"
 
-Bu::NullStream::NullStream()
+Bu::NullStream::NullStream() :
+	sRead( 0 ),
+	sWrote( 0 )
 {
 }
 
@@ -8,24 +10,96 @@ Bu::NullStream::~NullStream()
 {
 }
 
-void Bu::NullStream::close();
-size_t Bu::NullStream::read( void *pBuf, size_t nBytes );
-Bu::FString Bu::NullStream::readLine();
-size_t Bu::NullStream::write( const void *pBuf, size_t nBytes );
-long Bu::NullStream::tell();
-void Bu::NullStream::seek( long offset );
-void Bu::NullStream::setPos( long pos );
-void Bu::NullStream::setPosEnd( long pos );
-bool Bu::NullStream::isEos();
-bool Bu::NullStream::isOpen();
-void Bu::NullStream::flush();
-bool Bu::NullStream::canRead();
-bool Bu::NullStream::canWrite();
-bool Bu::NullStream::isReadable();
-bool Bu::NullStream::isWritable();
-bool Bu::NullStream::isSeekable();
-bool Bu::NullStream::isBlocking();
-void Bu::NullStream::setBlocking( bool bBlocking=true );
-void Bu::NullStream::setSize( long iSize );
+void Bu::NullStream::close()
+{
+	sRead = sWrote = 0;
+}
+
+size_t Bu::NullStream::read( void *pBuf, size_t nBytes )
+{
+	memset( pBuf, 0, nBytes );
+	sRead += nBytes;
+	return nBytes;
+}
+
+Bu::FString Bu::NullStream::readLine()
+{
+	sRead++;
+	return Bu::FString("\0", 1 );
+}
+
+size_t Bu::NullStream::write( const void *, size_t nBytes )
+{
+	sWrote += nBytes;
+	return nBytes;
+}
+
+long Bu::NullStream::tell()
+{
+	return sRead + sWrote;
+}
 
+void Bu::NullStream::seek( long )
+{
+}
+
+void Bu::NullStream::setPos( long )
+{
+}
+
+void Bu::NullStream::setPosEnd( long )
+{
+}
+
+bool Bu::NullStream::isEos()
+{
+	return false;
+}
+
+bool Bu::NullStream::isOpen()
+{
+	return true;
+}
+
+void Bu::NullStream::flush()
+{
+}
+
+bool Bu::NullStream::canRead()
+{
+	return true;
+}
+
+bool Bu::NullStream::canWrite()
+{
+	return true;
+}
+
+bool Bu::NullStream::isReadable()
+{
+	return true;
+}
+
+bool Bu::NullStream::isWritable()
+{
+	return true;
+}
+
+bool Bu::NullStream::isSeekable()
+{
+	return false;
+}
+
+bool Bu::NullStream::isBlocking()
+{
+	return true;
+}
+
+void Bu::NullStream::setBlocking( bool )
+{
+}
+
+void Bu::NullStream::setSize( long )
+{
+}
 
diff --git a/src/nullstream.h b/src/nullstream.h
index 5440af6..1537ffb 100644
--- a/src/nullstream.h
+++ b/src/nullstream.h
@@ -5,6 +5,18 @@
 
 namespace Bu
 {
+	/**
+	 * Works a lot like /dev/null on *nix style systems.  This class allows
+	 * infinite reading and writing.  All operatorns "succeed" even if they
+	 * don't seem to do anything.  This is great for testing writing code or
+	 * doing dry runs.  When reading, it will produce NULL bytes, so any
+	 * application that would like the ability to produce null streams as a
+	 * snap-in replacement for any other Bu::Stream, this is the right option.
+	 *
+	 * As an added feature, the NullStream will track how many bytes it was
+	 * asked to read and write, allowing you to use it to determine how many
+	 * bytes a write opretion would use without actually writing anything.
+	 */
 	class NullStream : public Bu::Stream
 	{
 	public:
@@ -31,6 +43,13 @@ namespace Bu
 		virtual bool isBlocking();
 		virtual void setBlocking( bool bBlocking=true );
 		virtual void setSize( long iSize );
+
+		size_t getBytesRead() { return sRead; }
+		size_t getByetsWritten() { return sWrote; }
+
+	private:
+		size_t sRead;
+		size_t sWrote;
 	};
 };
 
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