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// Copyright 2013 Chrisname. All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
// 1. Redistributions of source code must retain the above copyright notice,
// this list of conditions and the following disclaimer.
// 2. Redistributions in binary form must reproduce the above copyright notice,
// this list of conditions and the following disclaimer in the documentation
// and/or other materials provided with the distribution.
//
// THIS SOFTWARE IS PROVIDED BY CHRISNAME ``AS IS'' AND ANY EXPRESS OR IMPLIED
// WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
// EVENT SHALL CHRISNAME OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
// INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
// OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
// LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
// NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
// EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#include <array>
#include <cctype>
#include <cstdint>
#include <cstdlib>
#include <exception>
#include <fstream>
#include <iomanip>
#include <iostream>
#include <sstream>
#include <stdexcept>
#include <string>
#include <vector>
namespace ansi {
std::string escape(const std::string& seq)
{
#ifdef NO_COLOR
return "";
#else
return "\033[" + seq;
#endif
}
std::string reset()
{
return escape("0m");
}
namespace colors {
enum t { black, red, green, yellow, blue, magenta, cyan, white };
}
typedef colors::t color_t;
std::string color(color_t col, bool bright = true, bool is_fg = true)
{
std::stringstream sstream;
if (bright)
sstream << "1;";
sstream << (unsigned(col) + ((is_fg) ? 30 : 40)) << "m";
return escape(sstream.str());
}
}
namespace hexview {
static void print_offset(unsigned long offset)
{
static const std::array<std::string, 2> colors = {
ansi::color(ansi::colors::white),
ansi::color(ansi::colors::red, false, false)
};
std::cout << colors[0] << colors[1] << std::hex << std::setw(8)
<< std::setfill('0') << offset << std::dec << std::setw(0)
<< std::setfill(' ') << ansi::reset();
}
static void print_hex(const std::vector <uint8_t>& bytes)
{
static const std::array<std::string, 2> colors = {
ansi::color(ansi::colors::white),
ansi::color(ansi::colors::green, false, false)
};
size_t i = bytes.size();
for (const auto& byte : bytes) {
std::cout << colors[0] << colors[1] << std::hex << std::setw(2)
<< std::setfill('0') << unsigned(byte) << ansi::reset();
if (--i > 0)
std::cout.put(' ');
}
std::cout << std::dec << std::setw(0) << std::setfill(' ');
}
static void print_ascii(const std::vector <uint8_t>& bytes)
{
static const std::array<std::string, 2> colors = {
ansi::color(ansi::colors::white),
ansi::color(ansi::colors::blue, false, false)
};
std::cout << colors[0] << colors[1];
for (const auto& byte : bytes) {
if (std::isprint(byte) && byte != '\n')
std::cout.put(char(byte));
else
std::cout << '.';
}
std::cout << ansi::reset();
}
static const std::array<std::string, 2> error_colors = {
ansi::color(ansi::colors::red),
ansi::color(ansi::colors::black, false, false)
};
static unsigned long read_bytes(std::vector<uint8_t>& bytes,
unsigned long count, std::ifstream& file, const std::string& path)
{
unsigned long i;
uint8_t byte;
for (i = 0; (i < count); ++i) {
byte = (uint8_t)file.get();
if (file.bad()) {
std::stringstream sstream;
sstream << error_colors[0] << error_colors[1]
<< "Read error in file \"" << path << "\"";
throw std::runtime_error(sstream.str().c_str());
} else if (file.eof()) {
break;
} else {
bytes[i] = byte;
}
}
return i;
}
static int viewhex(std::ifstream& file, const std::string& path)
{
static const unsigned long bytes_per_line = 16;
unsigned long offset = 0;
while (true) {
std::vector<uint8_t> bytes(bytes_per_line);
print_offset(offset);
std::cout << " ";
offset += read_bytes(bytes, bytes_per_line, file, path);
print_hex(bytes);
std::cout << " ";
print_ascii(bytes);
std::cout.put('\n');
if (file.eof())
break;
}
std::cout << "Above file: " << path << std::endl;
return 0;
}
static int viewhex(const std::string& path)
{
std::ifstream file(path.c_str());
if (!(file.is_open())) {
std::stringstream sstream;
sstream << error_colors[0] << error_colors[1]
<< "Error opening file \"" << path << "\"";
throw std::runtime_error(sstream.str().c_str());
}
int ret = viewhex(file, path);
file.close();
return ret;
}
}
int main (int argc, char* argv[])
{
int i;
if (argc < 2) {
std::cerr << ansi::color(ansi::colors::red) << "Usage: " << argv[0]
<< " [file [file 2 [... [file n]]]]" << ansi::reset()
<< std::endl;
std::exit(EXIT_FAILURE);
}
for (i = 1; i < argc; ++i)
hexview::viewhex(argv[i]);
return 0;
}
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