From 5b8ba12cb35d3dfaad52fa3c0f1f1f39aca5d175 Mon Sep 17 00:00:00 2001
From: funnywwh <funnywwh@qq.com>
Date: Sat, 12 Nov 2022 09:21:34 +0000
Subject: [PATCH] fix slave output over buffersize

---
 webtty/webtty.go | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/webtty/webtty.go b/webtty/webtty.go
index 90c8c31..78116cf 100644
--- a/webtty/webtty.go
+++ b/webtty/webtty.go
@@ -72,7 +72,12 @@ func (wt *WebTTY) Run(ctx context.Context) error {
 		errs <- func() error {
 			buffer := make([]byte, wt.bufferSize)
 			for {
-				n, err := wt.slave.Read(buffer)
+				//base64 length
+				effectiveBufferSize := wt.bufferSize - 1
+				//max raw data length
+				maxChunkSize := int(effectiveBufferSize/4) * 3
+
+				n, err := wt.slave.Read(buffer[:maxChunkSize])
 				if err != nil {
 					return ErrSlaveClosed
 				}