// // Copyright Aliaksei Levin (levlam@telegram.org), Arseny Smirnov (arseny30@gmail.com) 2014-2023 // // Distributed under the Boost Software License, Version 1.0. (See accompanying // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) // #pragma once #include "td/utils/common.h" #include "td/utils/logging.h" #include "td/utils/Slice.h" #include "td/utils/SliceBuilder.h" #include "td/utils/Status.h" #include "td/utils/StringBuilder.h" #include <cstdint> #include <limits> #include <type_traits> #include <utility> namespace td { char *str_dup(Slice str); template <class T> std::pair<T, T> split(T s, char delimiter = ' ') { auto delimiter_pos = s.find(delimiter); if (delimiter_pos == string::npos) { return {std::move(s), T()}; } else { return {s.substr(0, delimiter_pos), s.substr(delimiter_pos + 1)}; } } template <class T> vector<T> full_split(T s, char delimiter = ' ', size_t max_parts = std::numeric_limits<size_t>::max()) { vector<T> result; if (s.empty()) { return result; } while (result.size() + 1 < max_parts) { auto delimiter_pos = s.find(delimiter); if (delimiter_pos == string::npos) { break; } result.push_back(s.substr(0, delimiter_pos)); s = s.substr(delimiter_pos + 1); } result.push_back(std::move(s)); return result; } string implode(const vector<string> &v, char delimiter = ' '); inline bool begins_with(Slice str, Slice prefix) { return prefix.size() <= str.size() && prefix == Slice(str.data(), prefix.size()); } inline bool ends_with(Slice str, Slice suffix) { return suffix.size() <= str.size() && suffix == Slice(str.data() + str.size() - suffix.size(), suffix.size()); } inline char to_lower(char c) { if ('A' <= c && c <= 'Z') { return static_cast<char>(c - 'A' + 'a'); } return c; } inline MutableSlice to_lower_inplace(MutableSlice slice) { for (auto &c : slice) { c = to_lower(c); } return slice; } inline string to_lower(Slice slice) { auto result = slice.str(); to_lower_inplace(result); return result; } inline char to_upper(char c) { if ('a' <= c && c <= 'z') { return static_cast<char>(c - 'a' + 'A'); } return c; } inline void to_upper_inplace(MutableSlice slice) { for (auto &c : slice) { c = to_upper(c); } } inline string to_upper(Slice slice) { auto result = slice.str(); to_upper_inplace(result); return result; } inline bool is_space(char c) { return c == ' ' || c == '\t' || c == '\r' || c == '\n' || c == '\0' || c == '\v'; } inline bool is_alpha(char c) { c |= 0x20; return 'a' <= c && c <= 'z'; } inline bool is_digit(char c) { return '0' <= c && c <= '9'; } inline bool is_alnum(char c) { return is_alpha(c) || is_digit(c); } inline bool is_hex_digit(char c) { if (is_digit(c)) { return true; } c |= 0x20; return 'a' <= c && c <= 'f'; } template <class T> T trim(T str) { auto begin = str.data(); auto end = begin + str.size(); while (begin < end && is_space(*begin)) { begin++; } while (begin < end && is_space(end[-1])) { end--; } if (static_cast<size_t>(end - begin) == str.size()) { return std::move(str); } return T(begin, end); } string lpad(string str, size_t size, char c); string lpad0(string str, size_t size); string rpad(string str, size_t size, char c); string oneline(Slice str); template <class T> std::enable_if_t<std::is_signed<T>::value, T> to_integer(Slice str) { using unsigned_T = typename std::make_unsigned<T>::type; unsigned_T integer_value = 0; auto begin = str.begin(); auto end = str.end(); bool is_negative = false; if (begin != end && *begin == '-') { is_negative = true; begin++; } while (begin != end && is_digit(*begin)) { integer_value = static_cast<unsigned_T>(integer_value * 10 + static_cast<unsigned_T>(*begin++ - '0')); } if (integer_value > static_cast<unsigned_T>(std::numeric_limits<T>::max())) { static_assert(~0 + 1 == 0, "Two's complement"); // Use ~x + 1 instead of -x to suppress Visual Studio warning. integer_value = static_cast<unsigned_T>(~integer_value + 1); is_negative = !is_negative; if (integer_value > static_cast<unsigned_T>(std::numeric_limits<T>::max())) { return std::numeric_limits<T>::min(); } } return is_negative ? static_cast<T>(-static_cast<T>(integer_value)) : static_cast<T>(integer_value); } template <class T> std::enable_if_t<std::is_unsigned<T>::value, T> to_integer(Slice str) { T integer_value = 0; auto begin = str.begin(); auto end = str.end(); while (begin != end && is_digit(*begin)) { integer_value = static_cast<T>(integer_value * 10 + static_cast<T>(*begin++ - '0')); } return integer_value; } namespace detail { Status get_to_integer_safe_error(Slice str); } // namespace detail template <class T> Result<T> to_integer_safe(Slice str) { auto res = to_integer<T>(str); if ((PSLICE() << res) != str) { return detail::get_to_integer_safe_error(str); } return res; } inline int hex_to_int(char c) { if (is_digit(c)) { return c - '0'; } c |= 0x20; if ('a' <= c && c <= 'f') { return c - 'a' + 10; } return 16; } template <class T> typename std::enable_if<std::is_unsigned<T>::value, T>::type hex_to_integer(Slice str) { T integer_value = 0; auto begin = str.begin(); auto end = str.end(); while (begin != end && is_hex_digit(*begin)) { integer_value = static_cast<T>(integer_value * 16 + hex_to_int(*begin++)); } return integer_value; } template <class T> Result<typename std::enable_if<std::is_unsigned<T>::value, T>::type> hex_to_integer_safe(Slice str) { T integer_value = 0; auto begin = str.begin(); auto end = str.end(); if (begin == end) { return Status::Error("String is empty"); } while (begin != end) { T digit = hex_to_int(*begin++); if (digit == 16) { return Status::Error("String contains non-hex digit"); } if (integer_value > std::numeric_limits<T>::max() / 16) { return Status::Error("String hex number overflows"); } integer_value = integer_value * 16 + digit; } return integer_value; } double to_double(Slice str); template <class T> T clamp(T value, T min_value, T max_value) { if (value < min_value) { return min_value; } if (value > max_value) { return max_value; } return value; } Result<string> hex_decode(Slice hex); string hex_encode(Slice data); string url_encode(Slice data); size_t url_decode(Slice from, MutableSlice to, bool decode_plus_sign_as_space); string url_decode(Slice from, bool decode_plus_sign_as_space); MutableSlice url_decode_inplace(MutableSlice str, bool decode_plus_sign_as_space); // run-time checked narrowing cast (type conversion): namespace detail { template <class T, class U> struct is_same_signedness final : public std::integral_constant<bool, std::is_signed<T>::value == std::is_signed<U>::value> {}; template <class T, class Enable = void> struct safe_undeflying_type { using type = T; }; template <class T> struct safe_undeflying_type<T, std::enable_if_t<std::is_enum<T>::value>> { using type = std::underlying_type_t<T>; }; class NarrowCast { const char *file_; int line_; public: NarrowCast(const char *file, int line) : file_(file), line_(line) { } template <class R, class A> R cast(const A &a) { using RT = typename safe_undeflying_type<R>::type; using AT = typename safe_undeflying_type<A>::type; static_assert(std::is_integral<RT>::value, "expected integral type to cast to"); static_assert(std::is_integral<AT>::value, "expected integral type to cast from"); auto r = R(a); LOG_CHECK(A(r) == a) << static_cast<AT>(a) << " " << static_cast<RT>(r) << " " << file_ << " " << line_; LOG_CHECK((is_same_signedness<RT, AT>::value) || ((static_cast<RT>(r) < RT{}) == (static_cast<AT>(a) < AT{}))) << static_cast<AT>(a) << " " << static_cast<RT>(r) << " " << file_ << " " << line_; return r; } }; } // namespace detail #define narrow_cast detail::NarrowCast(__FILE__, __LINE__).cast template <class R, class A> Result<R> narrow_cast_safe(const A &a) { using RT = typename detail::safe_undeflying_type<R>::type; using AT = typename detail::safe_undeflying_type<A>::type; static_assert(std::is_integral<RT>::value, "expected integral type to cast to"); static_assert(std::is_integral<AT>::value, "expected integral type to cast from"); auto r = R(a); if (!(A(r) == a)) { return Status::Error("Narrow cast failed"); } if (!((detail::is_same_signedness<RT, AT>::value) || ((static_cast<RT>(r) < RT{}) == (static_cast<AT>(a) < AT{})))) { return Status::Error("Narrow cast failed"); } return r; } template <int Alignment, class T> bool is_aligned_pointer(const T *pointer) { static_assert(Alignment > 0 && (Alignment & (Alignment - 1)) == 0, "Wrong alignment"); return (reinterpret_cast<std::uintptr_t>(static_cast<const void *>(pointer)) & (Alignment - 1)) == 0; } string buffer_to_hex(Slice buffer); string zero_encode(Slice data); string zero_decode(Slice data); string zero_one_encode(Slice data); string zero_one_decode(Slice data); } // namespace td