begin work on multi tech

seader_hf_read_plan.c

@@ -0,0 +1,49 @@
+#include "seader_hf_read_plan.h"
+
+#define SEADER_HF_READ_PLAN_MAX_TYPES 3U
+
+static void seader_hf_read_plan_add_type(
+    SeaderHfReadPlan* plan,
+    SeaderCredentialType type) {
+    if(type == SeaderCredentialTypeNone) {
+        return;
+    }
+
+    for(size_t i = 0; i < plan->detected_type_count; i++) {
+        if(plan->detected_types[i] == type) {
+            return;
+        }
+    }
+
+    if(plan->detected_type_count < SEADER_HF_READ_PLAN_MAX_TYPES) {
+        plan->detected_types[plan->detected_type_count++] = type;
+    }
+}
+
+SeaderHfReadPlan seader_hf_read_plan_build(
+    SeaderCredentialType selected_type,
+    const SeaderCredentialType* detected_types,
+    size_t detected_type_count) {
+    SeaderHfReadPlan plan = {0};
+
+    if(selected_type != SeaderCredentialTypeNone) {
+        plan.decision = SeaderHfReadDecisionStartRead;
+        plan.type_to_read = selected_type;
+        return plan;
+    }
+
+    for(size_t i = 0; i < detected_type_count; i++) {
+        seader_hf_read_plan_add_type(&plan, detected_types[i]);
+    }
+
+    if(plan.detected_type_count == 1U) {
+        plan.decision = SeaderHfReadDecisionStartRead;
+        plan.type_to_read = plan.detected_types[0];
+    } else if(plan.detected_type_count > 1U) {
+        plan.decision = SeaderHfReadDecisionSelectType;
+    } else {
+        plan.decision = SeaderHfReadDecisionContinuePolling;
+    }
+
+    return plan;
+}