net: do not call Windows TransmitFile for large files
TransmitFile does not allow for number of bytes that can be
transmitted to be larger than 2147483646. See
https://docs.microsoft.com/en-us/windows/win32/api/mswsock/nf-mswsock-transmitfile
for details. So adjust sendFile accordingly.
No test added, because this would require creating large file
(more than 2GB file).
Fixes #33193.
Change-Id: I82e0cb104d112264e4ea363bb20b6d02ac30b38e
Reviewed-on: https://go-review.googlesource.com/c/go/+/187037
Run-TryBot: Alex Brainman <alex.brainman@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Emmanuel Odeke <emm.odeke@gmail.com>
diff --git a/src/net/sendfile_windows.go b/src/net/sendfile_windows.go
index bccd8b1..a223e25 100644
--- a/src/net/sendfile_windows.go
+++ b/src/net/sendfile_windows.go
@@ -29,6 +29,13 @@
if n <= 0 {
return 0, nil, true
}
+ // TransmitFile can be invoked in one call with at most
+ // 2,147,483,646 bytes: the maximum value for a 32-bit integer minus 1.
+ // See https://docs.microsoft.com/en-us/windows/win32/api/mswsock/nf-mswsock-transmitfile
+ const maxSendBytes = 0x7fffffff - 1
+ if n > maxSendBytes {
+ return 0, nil, false
+ }
}
f, ok := r.(*os.File)
if !ok {
