bolt-gen: add truncated uint support for TLV fields

TLV's have truncated values, add support for them. plus
some 'compilation' tests.

tools/generate-bolts.py

@@ -153,10 +153,12 @@ class Type(FieldSet):
         'u16',
         'u32',
         'u64',
+        'tu16',
+        'tu32',
+        'tu64',
         'bool',
         'amount_sat',
         'amount_msat',
-        # FIXME: omits var_int
     ]
 
     typedefs = [
@@ -168,6 +170,12 @@ class Type(FieldSet):
         'secp256k1_ecdsa_signature',
     ]
 
+    truncated_typedefs = [
+        'tu16',
+        'tu32',
+        'tu64',
+    ]
+
     # Externally defined variable size types (require a context)
     varsize_types = [
         'peer_features',
@@ -238,6 +246,8 @@ class Type(FieldSet):
     def type_name(self):
         if self.name in self.typedefs:
             return self.name
+        if self.name in self.truncated_typedefs:
+            return self.name[1:]
         if self.is_enum:
             prefix = 'enum '
         else:

tools/test/test_cases

@@ -96,6 +96,8 @@ subtypedata,test_features,globalfeatures,u8,len_gf
 
 # TLV's!
 tlvtype,n1,tlv1,1
+# a truncated u64
+tlvdata,n1,tlv1,amount_msat,tu64,
 tlvtype,n1,tlv2,2
 # neseted subtype
 tlvdata,n1,tlv2,scid,test_short_id,
@@ -106,7 +108,9 @@ tlvdata,n1,tlv3,amount_msat_2,u64,
 tlvtype,n1,tlv4,254
 tlvdata,n1,tlv4,cltv_delta,u16,
 tlvtype,n2,tlv1,0
+tlvdata,n2,tlv1,amount_msat,tu64,
 tlvtype,n2,tlv2,11
+tlvdata,n2,tlv2,cltv_expiry,tu32,
 # TLV with all varsized and array structs
 tlvtype,n3,tlv3,1
 tlvdata,n3,tlv3,subtype,test_short_id,