make build records smaller

llarp/crypto/encrypted_frame.hpp

@@ -39,6 +39,16 @@ namespace llarp
       return *this;
     }
 
+    void
+    Resize(size_t sz)
+    {
+      if(sz <= EncryptedFrameSize)
+      {
+        _sz = sz;
+        UpdateBuffer();
+      }
+    }
+
     bool
     DecryptInPlace(const SecretKey& seckey, llarp::Crypto* crypto);
 

llarp/path/pathbuilder.cpp

@@ -89,17 +89,18 @@ namespace llarp
       record.nextHop     = hop.upstream;
       record.commkey     = seckey_topublic(hop.commkey);
 
-      auto buf = frame.Buffer();
-      buf->cur = buf->base + EncryptedFrameOverheadSize;
+      llarp_buffer_t buf(frame.data(), frame.size());
+      buf.cur = buf.base + EncryptedFrameOverheadSize;
       // encode record
-      if(!record.BEncode(buf))
+      if(!record.BEncode(&buf))
       {
         // failed to encode?
         LogError("Failed to generate Commit Record");
-        DumpBuffer(*buf);
+        DumpBuffer(buf);
         delete ctx;
         return;
       }
+      frame.Resize(buf.cur - buf.base);
       // use ephemeral keypair for frame
       SecretKey framekey;
       ctx->crypto->encryption_keygen(framekey);