[VOL-1349] EPON ONU adapter (package B)
Change-Id: I609ba349c429bc7e87c74b66bb1121841f9caef6
diff --git a/vendor/golang.org/x/net/http2/flow.go b/vendor/golang.org/x/net/http2/flow.go
new file mode 100644
index 0000000..cea601f
--- /dev/null
+++ b/vendor/golang.org/x/net/http2/flow.go
@@ -0,0 +1,50 @@
+// Copyright 2014 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Flow control
+
+package http2
+
+// flow is the flow control window's size.
+type flow struct {
+ // n is the number of DATA bytes we're allowed to send.
+ // A flow is kept both on a conn and a per-stream.
+ n int32
+
+ // conn points to the shared connection-level flow that is
+ // shared by all streams on that conn. It is nil for the flow
+ // that's on the conn directly.
+ conn *flow
+}
+
+func (f *flow) setConnFlow(cf *flow) { f.conn = cf }
+
+func (f *flow) available() int32 {
+ n := f.n
+ if f.conn != nil && f.conn.n < n {
+ n = f.conn.n
+ }
+ return n
+}
+
+func (f *flow) take(n int32) {
+ if n > f.available() {
+ panic("internal error: took too much")
+ }
+ f.n -= n
+ if f.conn != nil {
+ f.conn.n -= n
+ }
+}
+
+// add adds n bytes (positive or negative) to the flow control window.
+// It returns false if the sum would exceed 2^31-1.
+func (f *flow) add(n int32) bool {
+ sum := f.n + n
+ if (sum > n) == (f.n > 0) {
+ f.n = sum
+ return true
+ }
+ return false
+}