Allow null algorithm for pools.

src/crypto/common/Algorithm.cpp

@@ -31,6 +31,7 @@
 
 
 #include "crypto/common/Algorithm.h"
+#include "rapidjson/document.h"
 
 
 #ifdef _MSC_VER
@@ -111,6 +112,14 @@ static AlgoName const algorithm_names[] = {
 } /* namespace xmrig */
 
 
+rapidjson::Value xmrig::Algorithm::toJSON() const
+{
+    using namespace rapidjson;
+
+    return isValid() ? Value(StringRef(shortName())) : Value(kNullType);
+}
+
+
 xmrig::Algorithm::Family xmrig::Algorithm::family(Id id)
 {
     switch (id) {

src/crypto/common/Algorithm.h

@@ -30,6 +30,9 @@
 #include <vector>
 
 
+#include "rapidjson/fwd.h"
+
+
 namespace xmrig {
 
 
@@ -91,6 +94,8 @@ public:
     inline bool operator==(const Algorithm &other) const  { return isEqual(other); }
     inline operator Algorithm::Id() const                 { return m_id; }
 
+    rapidjson::Value toJSON() const;
+
     static Family family(Id id);
     static Id parse(const char *name);