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//
// 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
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