/**
* Computes the checksum of the registered functions.
* The function name is used to compute the checksum.
*/
uint32_t compute_functions_checksum()
{
uint32_t checksum = 0;
for (int i = funcs.size(); i-->0; )
{
checksum += string_crc(funcs[i].userFuncKey);
}
return checksum;
}
/**
* Computes the checksum of the registered variables.
* The checksum is derived from the variable name and type.
*/
uint32_t compute_variables_checksum()
{
uint32_t checksum = 0;
for (int i = vars.size(); i-->0; )
{
checksum += string_crc(vars[i].userVarKey);
checksum += crc(vars[i].userVarType);
}
return checksum;
}
User_Var_Lookup_Table_t* find_var_by_key(const char* varKey)
{
for (int i = vars.size(); i-->0; )
{
if (0 == strncmp(vars[i].userVarKey, varKey, USER_VAR_KEY_LENGTH))
{
return &vars[i];
}
}
return NULL;
}
User_Func_Lookup_Table_t* find_func_by_key(const char* funcKey)
{
for (int i = funcs.size(); i-->0; )
{
if (0 == strncmp(funcs[i].userFuncKey, funcKey, USER_FUNC_KEY_LENGTH))
{
return &funcs[i];
}
}
return NULL;
}
/**
* Register a function.
* @param desc
* @param reserved
* @return
*/
bool spark_function_internal(const cloud_function_descriptor* desc, void* reserved)
{
User_Func_Lookup_Table_t* item = NULL;
if (NULL != desc->fn && NULL != desc->funcKey && strlen(desc->funcKey)<=USER_FUNC_KEY_LENGTH)
{
if ((item=find_func_by_key(desc->funcKey)) || (item = funcs.add()))
{
item->pUserFunc = desc->fn;
item->pUserFuncData = desc->data;
memset(item->userFuncKey, 0, USER_FUNC_KEY_LENGTH);
memcpy(item->userFuncKey, desc->funcKey, USER_FUNC_KEY_LENGTH);
}
}
return item!=NULL;
}
User_Func_Lookup_Table_t* find_func_by_key_or_add(const char* funcKey)
{
User_Func_Lookup_Table_t* result = find_func_by_key(funcKey);
return result ? result : funcs.add();
}
User_Var_Lookup_Table_t* find_var_by_key_or_add(const char* varKey)
{
User_Var_Lookup_Table_t* result = find_var_by_key(varKey);
return result ? result : vars.add();
}