27 const std::string WHITESPACE = " \n\r\t\f\v";
32 std::string_view LTrim(const std::string_view s) {  in LTrim()
34   return (start == std::string::npos) ? "" : s.substr(start);  in LTrim()
37 std::string_view RTrim(const std::string_view s) {  in RTrim()
39   return (end == std::string::npos) ? "" : s.substr(0, end + 1);  in RTrim()
42 std::string_view Trim(const std::string_view s) { return RTrim(LTrim(s)); }  in Trim()
44 std::vector<std::string_view> Split(const std::string_view s,  in Split()
45                                     const std::string_view &delimiters) {  in Split()
46   std::vector<std::string_view> result;  in Split()
48   while ((start = s.find_first_not_of(delimiters, end)) != std::string::npos) {  in Split()
55 std::vector<std::string> Split(const std::string s,  in Split()
56                                const std::string &delimiters) {  in Split()
57   std::vector<std::string> result;  in Split()
59   while ((start = s.find_first_not_of(delimiters, end)) != std::string::npos) {  in Split()
66 std::string ToHexString(uint8_t x, uint8_t y) {  in ToHexString()
75 std::string ToHexString(uint8_t x) {  in ToHexString()
79 std::string ToHexString(const uint8_t *buf, size_t len) {  in ToHexString()
80   std::stringstream ss;  in ToHexString()
90 std::string ToHexString(const std::vector<uint8_t> &data, int max_length) {  in ToHexString()
91   std::string result;  in ToHexString()