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-rw-r--r--src/net/sendfile_windows.go55
1 files changed, 55 insertions, 0 deletions
diff --git a/src/net/sendfile_windows.go b/src/net/sendfile_windows.go
new file mode 100644
index 000000000..b128ba27b
--- /dev/null
+++ b/src/net/sendfile_windows.go
@@ -0,0 +1,55 @@
+// 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 (
+ "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.
+//
+// Note that sendfile for windows does not suppport >2GB file.
+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
+ }
+
+ if err := fd.writeLock(); err != nil {
+ return 0, err, true
+ }
+ defer fd.writeUnlock()
+
+ o := &fd.wop
+ o.qty = uint32(n)
+ o.handle = syscall.Handle(f.Fd())
+ done, err := wsrv.ExecIO(o, "TransmitFile", func(o *operation) error {
+ return syscall.TransmitFile(o.fd.sysfd, o.handle, o.qty, 0, &o.o, nil, syscall.TF_WRITE_BEHIND)
+ })
+ if err != nil {
+ return 0, err, false
+ }
+ if lr != nil {
+ lr.N -= int64(done)
+ }
+ return int64(done), nil, true
+}