[WIP] Initial attempt to validate >256kb ipfs files

.gitignore

@@ -114,3 +114,4 @@ crashlytics.properties
 crashlytics-build.properties
 fabric.properties
 
+.python-version

ethpm/_utils/protobuf/merkledag.proto

@@ -0,0 +1,39 @@
+package merkledag.pb;
+
+import "github.com/gogo/protobuf/gogoproto/gogo.proto";
+
+option (gogoproto.gostring_all) = true;
+option (gogoproto.equal_all) = true;
+option (gogoproto.verbose_equal_all) = true;
+option (gogoproto.goproto_stringer_all) = false;
+option (gogoproto.stringer_all) =  true;
+option (gogoproto.populate_all) = true;
+option (gogoproto.testgen_all) = true;
+option (gogoproto.benchgen_all) = true;
+option (gogoproto.marshaler_all) = true;
+option (gogoproto.sizer_all) = true;
+option (gogoproto.unmarshaler_all) = true;
+
+
+// An IPFS MerkleDAG Link
+message PBLink {
+
+  // multihash of the target object
+  optional bytes Hash = 1;
+
+  // utf string name. should be unique per object
+  optional string Name = 2;
+
+  // cumulative size of target object
+  optional uint64 Tsize = 3;
+}
+
+// An IPFS MerkleDAG Node
+message PBNode {
+
+  // refs to other objects
+  repeated PBLink Links = 2;
+
+  // opaque user data
+  optional bytes Data = 1;
+}