1 files changed, 47 insertions, 0 deletions
diff --git a/src/net/sendfile_windows.go b/src/net/sendfile_windows.go
new file mode 100644
index 0000000..59b1b0d
--- /dev/null
+++ b/src/net/sendfile_windows.go
@@ -0,0 +1,47 @@
+// Copyright 2011 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.
+
+package net
+
+import (
+	"internal/poll"
+	"io"
+	"os"
+	"syscall"
+)
+
+// sendFile copies the contents of r to c using the TransmitFile
+// system call to minimize copies.
+//
+// if handled == true, sendFile returns the number of bytes copied and any
+// non-EOF error.
+//
+// if handled == false, sendFile performed no work.
+func sendFile(fd *netFD, r io.Reader) (written int64, err error, handled bool) {
+	var n int64 = 0 // by default, copy until EOF.
+
+	lr, ok := r.(*io.LimitedReader)
+	if ok {
+		n, r = lr.N, lr.R
+		if n <= 0 {
+			return 0, nil, true
+		}
+	}
+
+	f, ok := r.(*os.File)
+	if !ok {
+		return 0, nil, false
+	}
+
+	written, err = poll.SendFile(&fd.pfd, syscall.Handle(f.Fd()), n)
+	if err != nil {
+		err = wrapSyscallError("transmitfile", err)
+	}
+
+	// If any byte was copied, regardless of any error
+	// encountered mid-way, handled must be set to true.
+	handled = written > 0
+
+	return
+}