extend file streaming cache to support range-based file stream queries; begin plugging in file stream queries as alternative to ctrl stream queries; further bugfixes & unification in eval system

src/df/core/df_core.c

@@ -3905,6 +3905,48 @@ df_eval_space_write(void *u, E_Space space, void *in, Rng1U64 range)
   return result;
 }
 
+internal Rng1U64
+df_range_from_eval_cfg(E_Eval eval, DF_CfgNode *cfg)
+{
+  Temp scratch = scratch_begin(0, 0);
+  E_Eval value_eval = e_value_eval_from_eval(eval);
+  DF_CfgNode *size_cfg = df_cfg_node_child_from_string(cfg, str8_lit("size"), 0);
+  String8 size_expr = df_string_from_cfg_node_children(scratch.arena, size_cfg);
+  E_Eval size_eval = e_eval_from_string(scratch.arena, size_expr);
+  E_Eval size_value_eval = e_value_eval_from_eval(size_eval);
+  Rng1U64 result = {0};
+  result.min = value_eval.value.u64;
+  result.max = max_U64;
+  if(size_eval.msgs.max_kind == E_MsgKind_Null)
+  {
+    result.max = result.min + size_value_eval.value.u64;
+  }
+  scratch_end(scratch);
+  return result;
+}
+
+internal U128
+df_key_from_eval_space_range(E_Space space, Rng1U64 range)
+{
+  U128 result = {0};
+  DF_Entity *entity = df_entity_from_eval_space(space);
+  switch(entity->kind)
+  {
+    //- rjf: nil space -> filesystem key encoded inside of `space`
+    case DF_EntityKind_Nil:
+    {
+      result = space;
+    }break;
+    
+    //- rjf: process space -> query 
+    case DF_EntityKind_Process:
+    {
+      result = ctrl_hash_store_key_from_process_vaddr_range(entity->ctrl_machine_id, entity->ctrl_handle, range, 0);
+    }break;
+  }
+  return result;
+}
+
 internal E_Eval
 df_eval_from_eval_cfg_table(Arena *arena, E_Eval eval, DF_CfgTable *cfg)
 {

src/df/core/df_core.h

@@ -1577,6 +1577,8 @@ internal DF_Entity *df_entity_from_eval_space(E_Space space);
 internal E_Space df_eval_space_from_entity(DF_Entity *entity);
 internal B32 df_eval_space_read(void *u, E_Space space, void *out, Rng1U64 range);
 internal B32 df_eval_space_write(void *u, E_Space space, void *in, Rng1U64 range);
+internal Rng1U64 df_range_from_eval_cfg(E_Eval eval, DF_CfgNode *cfg);
+internal U128 df_key_from_eval_space_range(E_Space space, Rng1U64 range);
 internal E_Eval df_eval_from_eval_cfg_table(Arena *arena, E_Eval eval, DF_CfgTable *cfg);
 
 ////////////////////////////////