add HexToBinary, move to RageUtil

stepmania/src/CryptManager.cpp

@@ -221,17 +221,6 @@ bool CryptManager::Verify( RString sPath, RString sSignature )
 }
 #endif
 
-static RString BinaryToHex( const unsigned char *string, int iNumBytes )
-{
-	RString s;
-	for( int i=0; i<iNumBytes; i++ )
-	{
-		unsigned val = string[i];
-		s += ssprintf( "%x", val );
-	}
-	return s;
-}
-
 RString CryptManager::GetMD5ForFile( RString fn )
 {
 	struct MD5Context md5c;

stepmania/src/RageUtil.cpp

@@ -113,6 +113,36 @@ bool IsHexVal( const RString &s )
 	return true;
 }
 
+RString BinaryToHex( const unsigned char *string, int iNumBytes )
+{
+       RString s;
+       for( int i=0; i<iNumBytes; i++ )
+       {
+               unsigned val = string[i];
+               s += ssprintf( "%x", val );
+       }
+       return s;
+}
+
+bool HexToBinary( const RString &s, unsigned char *stringOut )
+{
+       if( !IsHexVal(s) )
+               return false;
+
+       for( int i=0; true; i++ )
+       {
+               if( (int)s.size() <= i*2 )
+                       break;
+               RString sByte = s.substr( i*2, 2 );
+
+               uint8_t val = 0;
+               if( sscanf( sByte, "%hx", &val ) != 1 )
+                       return false;
+               stringOut[i] = val;
+       }
+       return true;
+}
+
 float HHMMSSToSeconds( const RString &sHHMMSS )
 {
 	vector<RString> arrayBits;

stepmania/src/RageUtil.h

@@ -241,6 +241,8 @@ float fmodfp( float x, float y );
 int power_of_two( int input );
 bool IsAnInt( const RString &s );
 bool IsHexVal( const RString &s );
+RString BinaryToHex( const unsigned char *string, int iNumBytes );
+bool HexToBinary( const RString &s, unsigned char *stringOut );
 float HHMMSSToSeconds( const RString &sHMS );
 RString SecondsToHHMMSS( float fSecs );
 RString SecondsToMSSMsMs( float fSecs );