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/**
* @file hexdump.h
* @author Nat Goodspeed
* @date 2023-09-08
* @brief Provide hexdump() and hexmix() ostream formatters
*
* $LicenseInfo:firstyear=2023&license=viewerlgpl$
* Copyright (c) 2023, Linden Research, Inc.
* $/LicenseInfo$
*/
#if ! defined(LL_HEXDUMP_H)
#define LL_HEXDUMP_H
#include <cctype>
#include <iomanip>
#include <iostream>
#include <string_view>
// Format a given byte string as 2-digit hex values, no separators
// Usage: std::cout << hexdump(somestring) << ...
class hexdump
{
public:
hexdump(const std::string_view& data):
hexdump(data.data(), data.length())
{}
hexdump(const char* data, size_t len):
hexdump(reinterpret_cast<const unsigned char*>(data), len)
{}
hexdump(const unsigned char* data, size_t len):
mData(data, data + len)
{}
friend std::ostream& operator<<(std::ostream& out, const hexdump& self)
{
auto oldfmt{ out.flags() };
auto oldfill{ out.fill() };
out.setf(std::ios_base::hex, std::ios_base::basefield);
out.fill('0');
for (auto c : self.mData)
{
out << std::setw(2) << unsigned(c);
}
out.setf(oldfmt, std::ios_base::basefield);
out.fill(oldfill);
return out;
}
private:
std::vector<unsigned char> mData;
};
// Format a given byte string as a mix of printable characters and, for each
// non-printable character, "\xnn"
// Usage: std::cout << hexmix(somestring) << ...
class hexmix
{
public:
hexmix(const std::string_view& data):
mData(data)
{}
hexmix(const char* data, size_t len):
mData(data, len)
{}
friend std::ostream& operator<<(std::ostream& out, const hexmix& self)
{
auto oldfmt{ out.flags() };
auto oldfill{ out.fill() };
out.setf(std::ios_base::hex, std::ios_base::basefield);
out.fill('0');
for (auto c : self.mData)
{
// std::isprint() must be passed an unsigned char!
if (std::isprint(static_cast<unsigned char>(c)))
{
out << c;
}
else
{
out << "\\x" << std::setw(2) << unsigned(c);
}
}
out.setf(oldfmt, std::ios_base::basefield);
out.fill(oldfill);
return out;
}
private:
std::string mData;
};
#endif /* ! defined(LL_HEXDUMP_H) */
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