From 029b5d159023f4dad607359dbfaa2479e21fe9e5 Mon Sep 17 00:00:00 2001
From: Mike Buland <eichlan@xagasoft.com>
Date: Thu, 27 Oct 2011 04:01:46 +0000
Subject: Added simple hex encoder/decoder filter.

---
 src/hex.cpp | 69 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 src/hex.h   | 57 ++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 126 insertions(+)
 create mode 100644 src/hex.cpp
 create mode 100644 src/hex.h

diff --git a/src/hex.cpp b/src/hex.cpp
new file mode 100644
index 0000000..2a04c6f
--- /dev/null
+++ b/src/hex.cpp
@@ -0,0 +1,69 @@
+/*
+ * Copyright (C) 2007-2011 Xagasoft, All rights reserved.
+ *
+ * This file is part of the libbu++ library and is released under the
+ * terms of the license contained in the file LICENSE.
+ */
+
+#include "bu/hex.h"
+
+Bu::Hex::Hex( Bu::Stream &rNext, bool bUpperCase, int iChunk ) :
+	Bu::Filter( rNext ),
+	iChunk( iChunk ),
+	iPos( 0 ),
+	iIn( 0 ),
+	sChrs(bUpperCase?"0123456789ABCDEF":"0123456789abcdef")
+{
+}
+
+Bu::Hex::~Hex()
+{
+}
+
+void Bu::Hex::start()
+{
+	iPos = iIn = 0;
+}
+
+Bu::size Bu::Hex::stop()
+{
+	return iPos;
+}
+
+Bu::size Bu::Hex::read( void *pBuf, Bu::size iBytes )
+{
+	Bu::size j;
+	uint8_t *puBuf = (uint8_t *)pBuf;
+	for( j = 0; j < iBytes; j++ )
+	{
+		for(; iIn < 2; iIn++ )
+		{
+			if( rNext.read( &cIn[iIn], 1 ) == 0 )
+				return j;
+			if( cIn[iIn] == ' ' || cIn[iIn] == '\t' ||
+				cIn[iIn] == '\n' || cIn[iIn] == '\r' )
+				iIn--;
+		}
+#define chr2nibble( c ) ((c>='0'&&c<='9')?(c-'0'):((c|0x60)-'a'+10))
+		puBuf[j] = ((chr2nibble(cIn[0])<<4)|chr2nibble(cIn[1]));
+		iIn = 0;
+	}
+	return j;
+}
+
+Bu::size Bu::Hex::write( const void *pBuf, Bu::size iBytes )
+{
+	char cOut[2];
+	uint8_t *puBuf = (uint8_t *)pBuf;
+	for( Bu::size j = 0; j < iBytes; j++ )
+	{
+		cOut[0] = sChrs[(puBuf[j]&0xf0)>>4];
+		cOut[1] = sChrs[(puBuf[j]&0x0f)];
+		if( iChunk > 0 && iPos%iChunk == 0 && iPos>0 )
+			rNext.write(" ", 1 );
+		rNext.write( cOut, 2 );
+		iPos++;
+	}
+	return iBytes;
+}
+
diff --git a/src/hex.h b/src/hex.h
new file mode 100644
index 0000000..3595fae
--- /dev/null
+++ b/src/hex.h
@@ -0,0 +1,57 @@
+/*
+ * Copyright (C) 2007-2011 Xagasoft, All rights reserved.
+ *
+ * This file is part of the libbu++ library and is released under the
+ * terms of the license contained in the file LICENSE.
+ */
+
+#ifndef BU_HEX_H
+#define BU_HEX_H
+
+#include "bu/filter.h"
+
+namespace Bu
+{
+	/**
+	 * This very simple filter encodes to/decodes from hex encoded string data.
+	 * The primary use of this filter is in debugging, use it with
+	 * Bu::encodeStr to easily create hex dumps of string data, even other raw
+	 * structures.
+	 *
+	 *@code
+	 Bu::println("Hexdump: " + Bu::encodeStr<Bu::Hex>("Test data ;)") );
+	 @endcode
+	 * Or...
+	 *@code
+	 complex_struct data;
+	 ...
+	 Bu::println("Hexdump: " +
+	 	Bu::encodeStr<Bu::Hex>(
+	 		Bu::String( &data, sizeof(data) )
+			)
+		);
+	 @endcode
+	 **/
+	class Hex : public Bu::Filter
+	{
+	public:
+		Hex( Bu::Stream &rNext, bool bUpperCase=false, int iChunk=-1 );
+		virtual ~Hex();
+
+		virtual void start();
+		virtual Bu::size stop();
+
+		virtual Bu::size read( void *pBuf, Bu::size iBytes );
+		virtual Bu::size write( const void *pBuf, Bu::size iBytes );
+		using Bu::Stream::write;
+
+	private:
+		int iChunk;
+		Bu::size iPos;
+		char cIn[2];
+		int iIn;
+		const char *sChrs;
+	};
+};
+
+#endif
-- 
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