added option to skip last symbol to addAll()

src/lib/ebus/symbol.cpp

@@ -47,12 +47,16 @@ static const unsigned char CRC_LOOKUP_TABLE[] =
 };
 
 
-void SymbolString::addAll(const SymbolString& str)
+void SymbolString::addAll(const SymbolString& str, bool skipLastSymbol)
 {
 	bool addCrc = m_unescapeState == 0;
 	bool isEscaped = str.m_unescapeState == 0;
 	vector<unsigned char> data = str.m_data;
-	for (size_t i = 0; i < data.size(); i++) {
+	size_t end = data.size();
+	if (end>0 && skipLastSymbol) {
+		end--;
+	}
+	for (size_t i = 0; i < end; i++) {
 		push_back(data[i], isEscaped, addCrc);
 	}
 	if (addCrc)

src/lib/ebus/symbol.h

@@ -86,8 +86,9 @@ public:
 	/**
 	 * Add all symbols from the other @a SymbolString and the calculated CRC if escaped.
 	 * @param str the @a SymbolString to copy from.
+	 * @param skipLastSymbol whether to skip the last symbol (probably the CRC).
 	 */
-	void addAll(const SymbolString& str);
+	void addAll(const SymbolString& str, const bool skipLastSymbol=false);
 
 	/**
 	 * Parse the escaped or unescaped hex @a string, add all symbols, and add the calculated CRC if escaped.