// // Copyright(c) 2015 Gabi Melman. // Distributed under the MIT License (http://opensource.org/licenses/MIT) // #pragma once #include <cctype> // // Support for logging binary data as hex // format flags, any combination of the followng: // {:X} - print in uppercase. // {:s} - don't separate each byte with space. // {:p} - don't print the position on each line start. // {:n} - don't split the output to lines. // {:a} - show ASCII if :n is not set // // Examples: // // std::vector<char> v(200, 0x0b); // logger->info("Some buffer {}", spdlog::to_hex(v)); // char buf[128]; // logger->info("Some buffer {:X}", spdlog::to_hex(std::begin(buf), std::end(buf))); // logger->info("Some buffer {:X}", spdlog::to_hex(std::begin(buf), std::end(buf), 16)); namespace spdlog { namespace details { template<typename It> class dump_info { public: dump_info(It range_begin, It range_end, size_t size_per_line) : begin_(range_begin) , end_(range_end) , size_per_line_(size_per_line) {} It begin() const { return begin_; } It end() const { return end_; } size_t size_per_line() const { return size_per_line_; } private: It begin_, end_; size_t size_per_line_; }; } // namespace details // create a dump_info that wraps the given container template<typename Container> inline details::dump_info<typename Container::const_iterator> to_hex(const Container &container, size_t size_per_line = 32) { static_assert(sizeof(typename Container::value_type) == 1, "sizeof(Container::value_type) != 1"); using Iter = typename Container::const_iterator; return details::dump_info<Iter>(std::begin(container), std::end(container), size_per_line); } // create dump_info from ranges template<typename It> inline details::dump_info<It> to_hex(const It range_begin, const It range_end, size_t size_per_line = 32) { return details::dump_info<It>(range_begin, range_end, size_per_line); } } // namespace spdlog namespace fmt { template<typename T> struct formatter<spdlog::details::dump_info<T>> { const char delimiter = ' '; bool put_newlines = true; bool put_delimiters = true; bool use_uppercase = false; bool put_positions = true; // position on start of each line bool show_ascii = false; // parse the format string flags template<typename ParseContext> auto parse(ParseContext &ctx) -> decltype(ctx.begin()) { auto it = ctx.begin(); while (it != ctx.end() && *it != '}') { switch (*it) { case 'X': use_uppercase = true; break; case 's': put_delimiters = false; break; case 'p': put_positions = false; break; case 'n': put_newlines = false; show_ascii = false; break; case 'a': if (put_newlines) { show_ascii = true; } break; } ++it; } return it; } // format the given bytes range as hex template<typename FormatContext, typename Container> auto format(const spdlog::details::dump_info<Container> &the_range, FormatContext &ctx) -> decltype(ctx.out()) { SPDLOG_CONSTEXPR const char *hex_upper = "0123456789ABCDEF"; SPDLOG_CONSTEXPR const char *hex_lower = "0123456789abcdef"; const char *hex_chars = use_uppercase ? hex_upper : hex_lower; #if FMT_VERSION < 60000 auto inserter = ctx.begin(); #else auto inserter = ctx.out(); #endif int size_per_line = static_cast<int>(the_range.size_per_line()); auto start_of_line = the_range.begin(); for (auto i = the_range.begin(); i != the_range.end(); i++) { auto ch = static_cast<unsigned char>(*i); if (put_newlines && (i == the_range.begin() || i - start_of_line >= size_per_line)) { if (show_ascii && i != the_range.begin()) { *inserter++ = delimiter; *inserter++ = delimiter; for (auto j = start_of_line; j < i; j++) { auto pc = static_cast<unsigned char>(*j); *inserter++ = std::isprint(pc) ? static_cast<char>(*j) : '.'; } } put_newline(inserter, static_cast<size_t>(i - the_range.begin())); // put first byte without delimiter in front of it *inserter++ = hex_chars[(ch >> 4) & 0x0f]; *inserter++ = hex_chars[ch & 0x0f]; start_of_line = i; continue; } if (put_delimiters) { *inserter++ = delimiter; } *inserter++ = hex_chars[(ch >> 4) & 0x0f]; *inserter++ = hex_chars[ch & 0x0f]; } if (show_ascii) // add ascii to last line { if (the_range.end() - the_range.begin() > size_per_line) { auto blank_num = size_per_line - (the_range.end() - start_of_line); while (blank_num-- > 0) { *inserter++ = delimiter; *inserter++ = delimiter; if (put_delimiters) { *inserter++ = delimiter; } } } *inserter++ = delimiter; *inserter++ = delimiter; for (auto j = start_of_line; j != the_range.end(); j++) { auto pc = static_cast<unsigned char>(*j); *inserter++ = std::isprint(pc) ? static_cast<char>(*j) : '.'; } } return inserter; } // put newline(and position header) template<typename It> void put_newline(It inserter, std::size_t pos) { #ifdef _WIN32 *inserter++ = '\r'; #endif *inserter++ = '\n'; if (put_positions) { fmt::format_to(inserter, "{:<04X}: ", pos); } } }; } // namespace fmt