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use min instead of if statement

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soypat
2026-09-07 07:36:35 -07:00
parent ffe7158053
commit d24f9cb362
1 changed files with 5 additions and 11 deletions
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tcp/handler.go
+5 -11
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@@ -658,7 +658,7 @@ func wndShiftFor(bufSize int) (shift uint8) {
return shift return shift
} }
// putSynOptions writes the option block shared by SYN and SYN-ACK segments: // putSynOptions writes the option block shared by SYN and SYN-ACK segments.
// MSS always, then the NOP-padded window-scale offer. An active SYN always // MSS always, then the NOP-padded window-scale offer. An active SYN always
// offers scaling, since a zero shift still lets the peer scale its own window // offers scaling, since a zero shift still lets the peer scale its own window
// (RFC 7323 §2.5). A SYN-ACK echoes the offer only when the peer's SYN carried // (RFC 7323 §2.5). A SYN-ACK echoes the offer only when the peer's SYN carried
@@ -674,19 +674,13 @@ func (h *Handler) putSynOptions(b []byte, mss uint16, isSynack bool) uint8 {
return words return words
} }
// wireWnd converts a segment's real window to its on-wire representation: SYN // wireWnd converts a segment's real window to its on-wire representation.
// windows are never scaled (RFC 7323 §2.2), other windows drop the low shift bits // SYN segments are never scaled (RFC7323 §2.2), we cap SYN windows at maxuint16.
// once both sides offered scaling, and a value still exceeding the 16-bit field
// saturates rather than wrapping to near zero.
func (h *Handler) wireWnd(seg Segment) Size { func (h *Handler) wireWnd(seg Segment) Size {
wnd := seg.WND
if h.peerOfferedWS && !seg.Flags.HasAny(FlagSYN) { if h.peerOfferedWS && !seg.Flags.HasAny(FlagSYN) {
wnd >>= h.wndShiftLocal return seg.WND >> h.wndShiftLocal
} }
if wnd > 0xFFFF { return min(seg.WND, 0xFFFF)
wnd = 0xFFFF
}
return wnd
} }
// AwaitingSynResponse returns true if the Handler is an active client opened with [Handler.OpenActive] and has already sent out the first SYN packet to the remote client. // AwaitingSynResponse returns true if the Handler is an active client opened with [Handler.OpenActive] and has already sent out the first SYN packet to the remote client.