FFI: Add function rnp_signature_get_trust_level().

Author: ni4

include/rnp/rnp.h

@@ -2101,6 +2101,21 @@ RNP_API rnp_result_t rnp_signature_get_revocation_reason(rnp_signature_handle_t
                                                          char **                code,
                                                          char **                reason);
 
+/**
+ * @brief Get the signature trust level and amount. See OpenPGP specification for the details
+ *        on their interpretation ('Trust Signature' signature subpacket).
+ *
+ * @param sig signature handle, cannot be NULL.
+ * @param level trust level will be stored here if non-NULL. If corresponding value is not
+ *              available then 0 will be stored.
+ * @param amount trust amount will be stored here if non-NULL. If corresponding value is not
+ *               available then 0 will be stored.
+ * @return RNP_SUCCESS or error code if failed.
+ */
+RNP_API rnp_result_t rnp_signature_get_trust_level(rnp_signature_handle_t sig,
+                                                   uint8_t *              level,
+                                                   uint8_t *              amount);
+
 /**
  * @brief Get signature validity, revalidating it if didn't before.
  *

src/lib/rnp.cpp

@@ -6915,6 +6915,25 @@ try {
 }
 FFI_GUARD
 
+rnp_result_t
+rnp_signature_get_trust_level(rnp_signature_handle_t sig, uint8_t *level, uint8_t *amount)
+try {
+    if (!sig) {
+        return RNP_ERROR_NULL_POINTER;
+    }
+    if (!sig->sig) {
+        return RNP_ERROR_BAD_PARAMETERS;
+    }
+    if (level) {
+        *level = sig->sig->sig.trust_level();
+    }
+    if (amount) {
+        *amount = sig->sig->sig.trust_amount();
+    }
+    return RNP_SUCCESS;
+}
+FFI_GUARD
+
 rnp_result_t
 rnp_signature_is_valid(rnp_signature_handle_t sig, uint32_t flags)
 try {