1 files changed, 81 insertions, 0 deletions
diff --git a/src/dat.proto b/src/dat.proto
new file mode 100644
index 0000000..1b7bc2c
--- /dev/null
+++ b/src/dat.proto
@@ -0,0 +1,81 @@
+// wire format is <len>(<header><message>)
+// header is a varint, channel << 4 | <4-bit-type>
+
+// type=0, should be the first message sent on a channel
+message Feed {
+  required bytes discoveryKey = 1;
+  optional bytes nonce = 2;
+}
+
+// type=1, overall connection handshake. should be send just after the feed message on the first channel only
+message Handshake {
+  optional bytes id = 1;
+  optional bool live = 2; // keep the connection open forever? both ends have to agree
+  optional bytes userData = 3;
+  repeated string extensions = 4;
+}
+
+// type=2, message indicating state changes etc.
+// initial state for uploading/downloading is true
+// if both ends are not downloading and not live it is safe to consider the stream ended
+message Info {
+  optional bool uploading = 1;
+  optional bool downloading = 2;
+}
+
+// type=3, what do we have?
+message Have {
+  required uint64 start = 1;
+  optional uint64 length = 2 [default = 1]; // defaults to 1
+  optional bytes bitfield = 3;
+}
+
+// type=4, what did we lose?
+message Unhave {
+  required uint64 start = 1;
+  optional uint64 length = 2 [default = 1]; // defaults to 1
+}
+
+// type=5, what do we want? remote should start sending have messages in this range
+message Want {
+  required uint64 start = 1;
+  optional uint64 length = 2; // defaults to Infinity or feed.length (if not live)
+}
+
+// type=6, what don't we want anymore?
+message Unwant {
+  required uint64 start = 1;
+  optional uint64 length = 2; // defaults to Infinity or feed.length (if not live)
+}
+
+// type=7, ask for data
+message Request {
+  required uint64 index = 1;
+  optional uint64 bytes = 2;
+  optional bool hash = 3;
+  optional uint64 nodes = 4;
+}
+
+// type=8, cancel a request
+message Cancel {
+  required uint64 index = 1;
+  optional uint64 bytes = 2;
+  optional bool hash = 3;
+}
+
+// type=9, get some data
+message Data {
+  message Node {
+    required uint64 index = 1;
+    required bytes hash = 2;
+    required uint64 size = 3;
+  }
+
+  required uint64 index = 1;
+  optional bytes value = 2;
+  repeated Node nodes = 3;
+  optional bytes signature = 4;
+}
+
+// type=15 (last massage) is an extension message
+// that is encoded like this <varint user-type><payload>