diff options
Diffstat (limited to 'matching/include/spdlog/fmt/bin_to_hex.h')
-rw-r--r-- | matching/include/spdlog/fmt/bin_to_hex.h | 172 |
1 files changed, 172 insertions, 0 deletions
diff --git a/matching/include/spdlog/fmt/bin_to_hex.h b/matching/include/spdlog/fmt/bin_to_hex.h new file mode 100644 index 0000000..3523380 --- /dev/null +++ b/matching/include/spdlog/fmt/bin_to_hex.h @@ -0,0 +1,172 @@ +// +// Copyright(c) 2015 Gabi Melman. +// Distributed under the MIT License (http://opensource.org/licenses/MIT) +// + +#pragma once + +// +// Support for logging binary data as hex +// format flags: +// {: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. + +// +// 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))); + +namespace spdlog { +namespace details { + +template<typename It> +class bytes_range +{ +public: + bytes_range(It range_begin, It range_end) + : begin_(range_begin) + , end_(range_end) + { + } + + It begin() const + { + return begin_; + } + It end() const + { + return end_; + } + +private: + It begin_, end_; +}; +} // namespace details + +// create a bytes_range that wraps the given container +template<typename Container> +inline details::bytes_range<typename Container::const_iterator> to_hex(const Container &container) +{ + static_assert(sizeof(typename Container::value_type) == 1, "sizeof(Container::value_type) != 1"); + using Iter = typename Container::const_iterator; + return details::bytes_range<Iter>(std::begin(container), std::end(container)); +} + +// create bytes_range from ranges +template<typename It> +inline details::bytes_range<It> to_hex(const It range_begin, const It range_end) +{ + return details::bytes_range<It>(range_begin, range_end); +} + +} // namespace spdlog + +namespace fmt { + +template<typename T> +struct formatter<spdlog::details::bytes_range<T>> +{ + const std::size_t line_size = 100; + 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 + + // parse the format string flags + template<typename ParseContext> + auto parse(ParseContext &ctx) -> decltype(ctx.begin()) + { + auto it = ctx.begin(); + while (*it && *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; + break; + } + + ++it; + } + return it; + } + + // format the given bytes range as hex + template<typename FormatContext, typename Container> + auto format(const spdlog::details::bytes_range<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; + + std::size_t pos = 0; + std::size_t column = line_size; + auto inserter = ctx.begin(); + + for (auto &item : the_range) + { + auto ch = static_cast<unsigned char>(item); + pos++; + + if (put_newlines && column >= line_size) + { + column = put_newline(inserter, pos); + + // put first byte without delimiter in front of it + *inserter++ = hex_chars[(ch >> 4) & 0x0f]; + *inserter++ = hex_chars[ch & 0x0f]; + column += 2; + continue; + } + + if (put_delimiters) + { + *inserter++ = delimiter; + ++column; + } + + *inserter++ = hex_chars[(ch >> 4) & 0x0f]; + *inserter++ = hex_chars[ch & 0x0f]; + column += 2; + } + return inserter; + } + + // put newline(and position header) + // return the next column + template<typename It> + std::size_t put_newline(It inserter, std::size_t pos) + { +#ifdef _WIN32 + *inserter++ = '\r'; +#endif + *inserter++ = '\n'; + + if (put_positions) + { + fmt::format_to(inserter, "{:<04X}: ", pos - 1); + return 7; + } + else + { + return 1; + } + } +}; +} // namespace fmt |