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#include <iostream>
#include <string>
#include <vector>
#include <memory>
#include "zstr.hpp"
void usage(std::ostream& os, const std::string& prog_name)
{
os << "Use: " << prog_name << " [-c] [-o output_file] files..." << std::endl
<< "Synposis:" << std::endl
<< " Decompress (with `-c`, compress) files to stdout (with `-o`, to output_file)." << std::endl;
}
void cat_stream(std::istream& is, std::ostream& os)
{
const std::streamsize buff_size = 1 << 16;
char * buff = new char [buff_size];
while (true)
{
is.read(buff, buff_size);
std::streamsize cnt = is.gcount();
if (cnt == 0) break;
os.write(buff, cnt);
}
delete [] buff;
} // cat_stream
void decompress_files(const std::vector< std::string >& file_v, const std::string& output_file)
{
//
// Set up sink ostream
//
std::unique_ptr< std::ofstream > ofs_p;
std::ostream * os_p = &std::cout;
if (not output_file.empty())
{
ofs_p = std::unique_ptr< std::ofstream >(new strict_fstream::ofstream(output_file));
os_p = ofs_p.get();
}
//
// Process files
//
for (const auto& f : file_v)
{
//
// If `f` is a file, create a zstr::ifstream, else (it is stdin) create a zstr::istream wrapper
//
std::unique_ptr< std::istream > is_p =
(f != "-"
? std::unique_ptr< std::istream >(new zstr::ifstream(f))
: std::unique_ptr< std::istream >(new zstr::istream(std::cin)));
//
// Cat stream
//
cat_stream(*is_p, *os_p);
}
} // decompress_files
void compress_files(const std::vector< std::string >& file_v, const std::string& output_file)
{
//
// Set up compression sink ostream
//
std::unique_ptr< std::ostream > os_p =
(not output_file.empty()
? std::unique_ptr< std::ostream >(new zstr::ofstream(output_file))
: std::unique_ptr< std::ostream >(new zstr::ostream(std::cout)));
//
// Process files
//
for (const auto& f : file_v)
{
//
// If `f` is a file, create an ifstream, else read stdin
//
std::unique_ptr< std::ifstream > ifs_p;
std::istream * is_p = &std::cin;
if (f != "-")
{
ifs_p = std::unique_ptr< std::ifstream >(new strict_fstream::ifstream(f));
is_p = ifs_p.get();
}
//
// Cat stream
//
cat_stream(*is_p, *os_p);
}
} // compress_files
int main(int argc, char * argv[])
{
bool compress = false;
std::string output_file;
int c;
while ((c = getopt(argc, argv, "co:h?")) != -1)
{
switch (c)
{
case 'c':
compress = true;
break;
case 'o':
if (std::string("-") != optarg)
{
output_file = optarg;
}
break;
case '?':
case 'h':
usage(std::cout, argv[0]);
std::exit(EXIT_SUCCESS);
break;
default:
usage(std::cerr, argv[0]);
std::exit(EXIT_FAILURE);
}
}
//
// Gather files to process
//
std::vector< std::string > file_v(&argv[optind], &argv[argc]);
//
// With no other arguments, process stdin
//
if (file_v.empty()) file_v.push_back("-");
//
// Perform compression/decompression
//
if (compress)
{
compress_files(file_v, output_file);
}
else
{
decompress_files(file_v, output_file);
}
}
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