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//
// 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
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