[Proto] Fix InvalidBufferSize for String Writing

Linwenxuan04 · Linwenxuan04 · commit c5cf7d2cb2ca · 2025-11-21T10:46:18.000+08:00
diff --git a/Lagrange.Proto/Primitives/ProtoWriter.cs b/Lagrange.Proto/Primitives/ProtoWriter.cs
@@ -42,7 +42,7 @@ public void EncodeString(ReadOnlySpan<char> str)
         int min = ProtoHelper.GetVarIntMin(count);
         int max = ProtoHelper.GetVarIntMax(count);
         int utf16Max = ProtoConstants.MaxExpansionFactorWhileTranscoding * str.Length;
-        if (_memory.Length < utf16Max + count) Grow(utf16Max + count);
+        if (_memory.Length - BytesPending < utf16Max + count) Grow(utf16Max + count);
         
         if (str.Length + count > min && utf16Max + count < max) // falls within the range
         {

Original file line number	Diff line number	Diff line change
`@@ -42,7 +42,7 @@ public void EncodeString(ReadOnlySpan<char> str)`
`42`	`42`	`int min = ProtoHelper.GetVarIntMin(count);`
`43`	`43`	`int max = ProtoHelper.GetVarIntMax(count);`
`44`	`44`	`int utf16Max = ProtoConstants.MaxExpansionFactorWhileTranscoding * str.Length;`
`45`		`- if (_memory.Length < utf16Max + count) Grow(utf16Max + count);`
	`45`	`+ if (_memory.Length - BytesPending < utf16Max + count) Grow(utf16Max + count);`
`46`	`46`
`47`	`47`	`if (str.Length + count > min && utf16Max + count < max) // falls within the range`
`48`	`48`	`{`