Added simple hex encoder/decoder filter.

1 files changed, 69 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;
+}
+