TUN-5261: Collect QUIC metrics about RTT, packets and bytes transfered and log events at tracing level

vendor/github.com/francoispqt/gojay/encode_builder.go

@@ -0,0 +1,65 @@
+package gojay
+
+const hex = "0123456789abcdef"
+
+// grow grows b's capacity, if necessary, to guarantee space for
+// another n bytes. After grow(n), at least n bytes can be written to b
+// without another allocation. If n is negative, grow panics.
+func (enc *Encoder) grow(n int) {
+	if cap(enc.buf)-len(enc.buf) < n {
+		Buf := make([]byte, len(enc.buf), 2*cap(enc.buf)+n)
+		copy(Buf, enc.buf)
+		enc.buf = Buf
+	}
+}
+
+// Write appends the contents of p to b's Buffer.
+// Write always returns len(p), nil.
+func (enc *Encoder) writeBytes(p []byte) {
+	enc.buf = append(enc.buf, p...)
+}
+
+func (enc *Encoder) writeTwoBytes(b1 byte, b2 byte) {
+	enc.buf = append(enc.buf, b1, b2)
+}
+
+// WriteByte appends the byte c to b's Buffer.
+// The returned error is always nil.
+func (enc *Encoder) writeByte(c byte) {
+	enc.buf = append(enc.buf, c)
+}
+
+// WriteString appends the contents of s to b's Buffer.
+// It returns the length of s and a nil error.
+func (enc *Encoder) writeString(s string) {
+	enc.buf = append(enc.buf, s...)
+}
+
+func (enc *Encoder) writeStringEscape(s string) {
+	l := len(s)
+	for i := 0; i < l; i++ {
+		c := s[i]
+		if c >= 0x20 && c != '\\' && c != '"' {
+			enc.writeByte(c)
+			continue
+		}
+		switch c {
+		case '\\', '"':
+			enc.writeTwoBytes('\\', c)
+		case '\n':
+			enc.writeTwoBytes('\\', 'n')
+		case '\f':
+			enc.writeTwoBytes('\\', 'f')
+		case '\b':
+			enc.writeTwoBytes('\\', 'b')
+		case '\r':
+			enc.writeTwoBytes('\\', 'r')
+		case '\t':
+			enc.writeTwoBytes('\\', 't')
+		default:
+			enc.writeString(`\u00`)
+			enc.writeTwoBytes(hex[c>>4], hex[c&0xF])
+		}
+		continue
+	}
+}