feat: add sniffing suite and dial_mode option (#16)

component/sniffing/internal/quicutils/binary.go

@@ -0,0 +1,25 @@
+/*
+ * SPDX-License-Identifier: AGPL-3.0-only
+ * Copyright (c) since 2023, v2rayA Organization <team@v2raya.org>
+ */
+
+package quicutils
+
+import "io"
+
+// BigEndianUvarint decodes a uint64 from buf and returns that value and the
+// number of bytes read (> 0).
+func BigEndianUvarint(buf []byte) (uint64, int, error) {
+	if len(buf) == 0 {
+		return 0, 0, io.ErrUnexpectedEOF
+	}
+	length := 1 << (buf[0] >> 6)
+	if length == 0 {
+		return 0, 0, io.ErrUnexpectedEOF
+	}
+	x := uint64(buf[0] & 0x3f)
+	for i := 1; i < length; i++ {
+		x = x<<8 | uint64(buf[i])
+	}
+	return x, length, nil
+}