Function ZL_Output_stringLens 

pub unsafe extern "C" fn ZL_Output_stringLens(
    output: *mut ZL_Output,
) -> *mut u32

This method is only valid for ZL_Type_string Data. It requests write access into StringLens array. Only valid if StringLens array has already been allocated. @return pointer to array position to resume writing. or NULL if any of above conditions is violated.

Array’s capacity is supposed known from reservation request. After writing into the array, the nb of Strings, which is also the nb of String Lengths written, must be provided using ZL_Data_commit().