Fix handling of \b, \f, \n, \r, \t

Author: webmaster128

types/json_size.go

@@ -10,6 +10,9 @@ func ExpectedJSONSizeString(s string) int {
 	for _, r := range s {
 		if r == '"' || r == '\\' {
 			out += 1
+		} else if r == '\b' || r == '\f' || r == '\n' || r == '\r' || r == '\t' {
+			// https://cs.opensource.google/go/go/+/master:src/encoding/json/encode.go;l=992-1001;drc=0909bcd9e4acb01089d588d608d669d69710e50a
+			out += 1
 		} else if r <= 0x1F {
 			// control codes \u0000 - \u001f
 			out += 5

types/json_size_test.go

@@ -44,6 +44,21 @@ func TestExpectedJSONSizeString(t *testing.T) {
 		"control character DEL": {
 			input: "\x7F",
 		},
+		"control character LF": {
+			input: "\n",
+		},
+		"control character CR": {
+			input: "\r",
+		},
+		"control character BS": {
+			input: "\b",
+		},
+		"control character HT": {
+			input: "\t",
+		},
+		"control character FF": {
+			input: "\f",
+		},
 		"emoji": {
 			input: "😮😗🧝🏾‍♀️",
 		},