1 files changed, 68 insertions, 0 deletions
diff --git a/common.go b/common.go
new file mode 100644
index 0000000..97c8fdc
--- /dev/null
+++ b/common.go
@@ -0,0 +1,68 @@
+// Package binproto provides functions to handle a simple binary protocol.
+package binproto
+
+import (
+	"errors"
+)
+
+type UnitType byte
+
+// Possible UnitType values
+const (
+	UTNil = iota
+	UTRequest
+	UTAnswer
+	UTEvent
+	UTBin
+	UTNumber
+	UTList
+	UTTextKVMap
+	UTIdKVMap
+	UTUKey
+	UTBinStream
+	UTTerm
+	UTBool
+	UTByte
+)
+
+func (ut UnitType) String() string {
+	switch ut {
+	case UTNil:
+		return "UTNil"
+	case UTRequest:
+		return "UTRequest"
+	case UTAnswer:
+		return "UTAnswer"
+	case UTEvent:
+		return "UTEvent"
+	case UTBin:
+		return "UTBin"
+	case UTNumber:
+		return "UTNumber"
+	case UTList:
+		return "UTList"
+	case UTTextKVMap:
+		return "UTTextKVMap"
+	case UTIdKVMap:
+		return "UTIdKVMap"
+	case UTUKey:
+		return "UTUKey"
+	case UTBinStream:
+		return "UTBinStream"
+	case UTTerm:
+		return "UTTerm"
+	case UTBool:
+		return "UTBool"
+	case UTByte:
+		return "UTByte"
+	}
+	return "Unknown unit"
+}
+
+// Errors
+var (
+	UnknownUnit     = errors.New("Unknown unit received")
+	UnexpectedUnit  = errors.New("Unexpected unit received")
+	Terminated      = errors.New("List or KVMap terminated")
+	TooDeeplyNested = errors.New("Received data is too deeply nested to skip")
+)