//
// Copyright(c) 2015 Gabi Melman.
// Distributed under the MIT License (http://opensource.org/licenses/MIT)
//
#pragma once
#include <cctype>
#include <spdlog/common.h>
#if defined(__has_include)
#if __has_include(<version>)
#include <version>
#endif
#endif
#if __cpp_lib_span >= 202002L
#include <span>
#endif
//
// Support for logging binary data as hex
// format flags, any combination of the following:
// {: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) {}
// do not use begin() and end() to avoid collision with fmt/ranges
It get_begin() const { return begin_; }
It get_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);
}
#if __cpp_lib_span >= 202002L
template <typename Value, size_t Extent>
inline details::dump_info<typename std::span<Value, Extent>::iterator> to_hex(
const std::span<Value, Extent> &container, size_t size_per_line = 32) {
using Container = std::span<Value, Extent>;
static_assert(sizeof(typename Container::value_type) == 1,
"sizeof(Container::value_type) != 1");
using Iter = typename Container::iterator;
return details::dump_info<Iter>(std::begin(container), std::end(container), size_per_line);
}
#endif
// 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
#ifdef SPDLOG_USE_STD_FORMAT
std
#else
fmt
#endif
{
template <typename T>
struct formatter<spdlog::details::dump_info<T>, char> {
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>
SPDLOG_CONSTEXPR_FUNC 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) const
-> 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 !defined(SPDLOG_USE_STD_FORMAT) && 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.get_begin();
for (auto i = the_range.get_begin(); i != the_range.get_end(); i++) {
auto ch = static_cast<unsigned char>(*i);
if (put_newlines &&
(i == the_range.get_begin() || i - start_of_line >= size_per_line)) {
if (show_ascii && i != the_range.get_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.get_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 && i != the_range.get_begin()) {
*inserter++ = delimiter;
}
*inserter++ = hex_chars[(ch >> 4) & 0x0f];
*inserter++ = hex_chars[ch & 0x0f];
}
if (show_ascii) // add ascii to last line
{
if (the_range.get_end() - the_range.get_begin() > size_per_line) {
auto blank_num = size_per_line - (the_range.get_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.get_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) const {
#ifdef _WIN32
*inserter++ = '\r';
#endif
*inserter++ = '\n';
if (put_positions) {
spdlog::fmt_lib::format_to(inserter, SPDLOG_FMT_STRING("{:04X}: "), pos);
}
}
};
} // namespace std