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#include <cstring>
#include <iostream>
#include <fstream>
#include <sstream>
#include "grey.hpp"
#include "huffman.hpp"
std::vector<std::uint8_t> read_file(char *filename)
{
std::ifstream input_file{ filename, std::ios::binary | std::ios::in };
input_file.exceptions(std::ios::badbit | std::ios::failbit);
return std::vector<std::uint8_t>{ std::istreambuf_iterator<char>(input_file), {} };
}
int show_usage()
{
std::cerr << "Usage: grey (compress|decompress) input_file output_file." << std::endl;
return 1;
}
enum class direction {
compress,
decompress
};
int main(int argc, char **argv)
{
direction operation;
if (argc != 4)
{
return show_usage();
}
if (std::strcmp(argv[1], "compress") == 0)
{
operation = direction::compress;
}
else if (std::strcmp(argv[1], "decompress") == 0)
{
operation = direction::decompress;
}
else
{
return show_usage();
}
switch (operation)
{
case direction::compress:
try {
std::ofstream output_file{ argv[3], std::ios::binary | std::ios::out | std::ios::trunc };
output_file.exceptions(std::ios::badbit | std::ios::failbit);
auto rle_stream = to_rle(argv[2]);
compress(rle_stream, output_file);
break;
}
catch (const std::runtime_error& e)
{
std::cerr << "Error decoding \"" << argv[2] << "\": " << e.what() << '.' << std::endl;
return 2;
}
case direction::decompress:
{
auto input = read_file(argv[2]);
std::stringstream rle_stream;
decompress(input, rle_stream);
from_rle(rle_stream.str(), argv[3]);
}
break;
}
return 0;
}
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