This closes #1519, escape XML characters after checking cell value length

cell.go

@@ -451,17 +451,22 @@ func (f *File) setSharedString(val string) (int, error) {
 	sst.Count++
 	sst.UniqueCount++
 	t := xlsxT{Val: val}
-	val, t.Space = trimCellValue(val)
+	val, t.Space = trimCellValue(val, false)
 	sst.SI = append(sst.SI, xlsxSI{T: &t})
 	f.sharedStringsMap[val] = sst.UniqueCount - 1
 	return sst.UniqueCount - 1, nil
 }
 
 // trimCellValue provides a function to set string type to cell.
-func trimCellValue(value string) (v string, ns xml.Attr) {
+func trimCellValue(value string, escape bool) (v string, ns xml.Attr) {
 	if utf8.RuneCountInString(value) > TotalCellChars {
 		value = string([]rune(value)[:TotalCellChars])
 	}
+	buf := &bytes.Buffer{}
+	if escape {
+		_ = xml.EscapeText(buf, []byte(value))
+		value = buf.String()
+	}
 	if len(value) > 0 {
 		prefix, suffix := value[0], value[len(value)-1]
 		for _, ascii := range []byte{9, 10, 13, 32} {
@@ -492,15 +497,13 @@ func (c *xlsxC) setCellValue(val string) {
 // string.
 func (c *xlsxC) setInlineStr(val string) {
 	c.T, c.V, c.IS = "inlineStr", "", &xlsxSI{T: &xlsxT{}}
-	buf := &bytes.Buffer{}
+	c.IS.T.Val, c.IS.T.Space = trimCellValue(val, true)
-	_ = xml.EscapeText(buf, []byte(val))
-	c.IS.T.Val, c.IS.T.Space = trimCellValue(buf.String())
 }
 
 // setStr set cell data type and value which containing a formula string.
 func (c *xlsxC) setStr(val string) {
 	c.T, c.IS = "str", nil
-	c.V, c.XMLSpace = trimCellValue(val)
+	c.V, c.XMLSpace = trimCellValue(val, false)
 }
 
 // getCellDate parse cell value which containing a boolean.
@@ -1031,7 +1034,7 @@ func setRichText(runs []RichTextRun) ([]xlsxR, error) {
 			return textRuns, ErrCellCharsLength
 		}
 		run := xlsxR{T: &xlsxT{}}
-		run.T.Val, run.T.Space = trimCellValue(textRun.Text)
+		run.T.Val, run.T.Space = trimCellValue(textRun.Text, false)
 		fnt := textRun.Font
 		if fnt != nil {
 			run.RPr = newRpr(fnt)

cell_test.go

@@ -177,16 +177,36 @@ func TestSetCellFloat(t *testing.T) {
 }
 
 func TestSetCellValuesMultiByte(t *testing.T) {
-	value := strings.Repeat("\u042B", TotalCellChars+1)
-
 	f := NewFile()
-	err := f.SetCellValue("Sheet1", "A1", value)
+	row := []interface{}{
+		// Test set cell value with multi byte characters value
+		strings.Repeat("\u4E00", TotalCellChars+1),
+		// Test set cell value with XML escape characters
+		strings.Repeat("<>", TotalCellChars/2),
+		strings.Repeat(">", TotalCellChars-1),
+		strings.Repeat(">", TotalCellChars+1),
+	}
+	assert.NoError(t, f.SetSheetRow("Sheet1", "A1", &row))
+	// Test set cell value with XML escape characters in stream writer
+	_, err := f.NewSheet("Sheet2")
 	assert.NoError(t, err)
-
+	streamWriter, err := f.NewStreamWriter("Sheet2")
-	v, err := f.GetCellValue("Sheet1", "A1")
 	assert.NoError(t, err)
-	assert.NotEqual(t, value, v)
+	assert.NoError(t, streamWriter.SetRow("A1", row))
-	assert.Equal(t, TotalCellChars, len([]rune(v)))
+	assert.NoError(t, streamWriter.Flush())
+	for _, sheetName := range []string{"Sheet1", "Sheet2"} {
+		for cell, expected := range map[string]int{
+			"A1": TotalCellChars,
+			"B1": TotalCellChars - 1,
+			"C1": TotalCellChars - 1,
+			"D1": TotalCellChars,
+		} {
+			result, err := f.GetCellValue(sheetName, cell)
+			assert.NoError(t, err)
+			assert.Len(t, []rune(result), expected)
+		}
+	}
+	assert.NoError(t, f.SaveAs(filepath.Join("test", "TestSetCellValuesMultiByte.xlsx")))
 }
 
 func TestSetCellValue(t *testing.T) {