Added simple hex encoder/decoder filter.

2 files changed, 126 insertions, 0 deletions

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