FIX: json decoder bug jdec was crashing when string had spaces

include/utils/json.h

@@ -49,6 +49,8 @@ struct json_dec_t {
         size_t pairs =0;
         char* begin = nullptr;
         int s =0;
+        bool str_value = false;     // flag to indicate the value is string
+
         for (size_t i=0 ; i<size ; ++i) {
             switch (state) {
                 case ST:
@@ -99,26 +101,46 @@ struct json_dec_t {
                         valid_ = false;
                         break;
                     }
-                    if (!begin && std::isspace(buffer[i]))
+                    if (!begin && std::isspace(buffer[i]))          // consume pre-spaces
                         continue;
-                    else if (!begin && !std::isspace(buffer[i]))
-                        begin = (buffer[i] != '\"') ? (char*)&buffer[i] : (char*)&buffer[i+1];
-                    else if (begin && (std::isspace(buffer[i]) || buffer[i] == ',' || buffer[i] == '}')) {
-                        s  = (char*)&buffer[i] - begin;
-                        s -= (buffer[i-1] == '\"') ? 1:0;
-                        if (s > 0)
-                            pairs_[pairs].value = std::string_view{begin, (size_t)s};
-                        else
-                            pairs_[pairs].value = std::string_view{};
-                        ++pairs;
-                        begin =nullptr;
-                        s =0;
-                        if (std::isspace(buffer[i]))
+                    else if (!begin && !std::isspace(buffer[i])) {  // first character
+                        if (buffer[i] == '\"') {
+                            begin = (char*)&buffer[i+1];
+                            str_value = true;
+                        }
+                        else {
+                            begin = (char*)&buffer[i];
+                            str_value = false;
+                        }
+                    }
+                    else if (begin) {
+                        if (str_value && (buffer[i] == '\"')) {
+                            s  = (char*)&buffer[i] - begin;
+                            if (s > 0)
+                                pairs_[pairs].value = std::string_view{begin, (size_t)s};
+                            else
+                                pairs_[pairs].value = std::string_view{};
+                            ++pairs;
+                            begin =nullptr;
+                            s =0;
                             state = SP;
-                        else if (buffer[i] == ',')
-                            state = KEY;
-                        else if (buffer[i] == '}')
-                            return;
+                        }
+                        else if (!str_value && (std::isspace(buffer[i]) || buffer[i] == ',' || buffer[i] == '}')) {
+                            s  = (char*)&buffer[i] - begin;
+                            if (s > 0)
+                                pairs_[pairs].value = std::string_view{begin, (size_t)s};
+                            else
+                                pairs_[pairs].value = std::string_view{};
+                            ++pairs;
+                            begin =nullptr;
+                            s =0;
+                            if (std::isspace(buffer[i]))
+                                state = SP;
+                            else if (buffer[i] == ',')
+                                state = KEY;
+                            else if (buffer[i] == '}')
+                                return;
+                        }
                     }
                     break;