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#ifdef _WIN32
#include <shlwapi.h>
#else
#include <fnmatch.h>
#endif
#include <unistd.h>
#include <cstdint>
#include <exception>
#include <filesystem>
#include <fstream>
#include <functional>
#include <iostream>
#include <memory>
#include <ostream>
#include <string>
#include <system_error>
#include <vector>
#include <Archive.h>
namespace fs = std::filesystem;
enum class Action
{
NOTHING,
LIST,
BLOCKS,
UPDATE,
EXTRACT,
};
struct Options
{
bool help {false};
Action action {Action::NOTHING};
bool create {false};
const char* archive {nullptr};
std::vector<std::string> files {};
};
class ArgsError : std::exception
{
public:
ArgsError(int opt, const char* msg) : option {opt}, message {msg} {}
int option;
const char* message;
};
class ExtractError : std::exception {};
static Options ParseArgs(int argc, char* argv[]);
static void PrintUsage(std::ostream& out=std::cerr);
static void PrintHelp(std::ostream& out=std::cout);
static auto FilterFile(const std::vector<std::string>& patterns, std::function<void(const char*)> func) ->
std::function<void(const char*)>;
static void UpdateFile(ArchiveEx::Archive& archive, const std::string& path, bool warn=true);
static void ExtractFile(ArchiveEx::Archive& archive, const char* filepath);
static const char* program {"dat"};
int
main(int argc, char* argv[])
try {
program = argv[0];
const auto opts = ParseArgs(argc, argv);
if (opts.help) {
PrintUsage(std::cout);
PrintHelp();
return 0;
}
ArchiveEx::Archive archive(opts.archive, opts.create);
std::size_t i = 0;
switch (opts.action) {
case Action::NOTHING:
break;
case Action::LIST:
archive.ForEachEntry(FilterFile(opts.files, [](const char* name){ std::cout << name << std::endl; }));
break;
case Action::BLOCKS:
archive.ForEachBlock([&i](const char* name){ std::cout << i++ << "\t" << name << std::endl; });
break;
case Action::UPDATE:
for (const auto& file : opts.files)
UpdateFile(archive, file);
break;
case Action::EXTRACT:
archive.ForEachEntry(FilterFile(opts.files, [&archive](const char* name){ ExtractFile(archive, name); }));
break;
}
}
catch (const ArgsError& err) {
std::cerr << err.message;
if (err.option > 0)
std::cerr << ": " << static_cast<char>(err.option);
std::cerr << std::endl;
PrintUsage();
return 1;
}
catch (const char* err) {
std::cerr << err << std::endl;
return 1;
}
Options
ParseArgs(int argc, char* argv[])
{
int opt;
Options opts;
while (-1 != (opt = getopt(argc, argv, ":hlbuxc"))) {
switch (opt) {
case 'h':
opts.help = true;
return opts; // No need to waste time as program won't do anything else anyway.
case 'l':
opts.action = Action::LIST;
break;
case 'b':
opts.action = Action::BLOCKS;
break;
case 'u':
opts.action = Action::UPDATE;
break;
case 'x':
opts.action = Action::EXTRACT;
break;
case 'c':
opts.create = true;
break;
case ':':
throw ArgsError(optopt, "missing argument for option");
default:
throw ArgsError(optopt, "invalid option");
}
}
if (optind >= argc)
throw ArgsError(0, "missing archive name");
opts.archive = argv[optind++];
for (; optind < argc; ++optind)
opts.files.emplace_back(argv[optind]);
return opts;
}
void
PrintUsage(std::ostream& out)
{
out << "Usage: " << program << " [-hlbuxc] archive [file [files...]]" << std::endl;
}
void
PrintHelp(std::ostream& out)
{
out << "Options:" << std::endl;
out << " -h\tPrints this help message and exits." << std::endl;
out << " -l\tLists files in the archive." << std::endl;
out << " -b\tLists content of each block in archive." << std::endl;
out << " -u\tInserts files from file system into archive." << std::endl;
out << " -x\tExtracts files from the archive." << std::endl;
out << " -c\tCreate the archive if it does not exist." << std::endl;
}
std::function<void(const char*)>
FilterFile(const std::vector<std::string>& patterns, std::function<void(const char*)> func)
{
return [&patterns, func](const char* name) -> void {
if (patterns.empty())
return func(name);
for (const auto& pattern : patterns) {
#ifdef _WIN32
if (PathMatchSpecA(name, pattern.c_str()))
#else
if (0 == fnmatch(pattern.c_str(), name, FNM_PATHNAME | FNM_LEADING_DIR))
#endif
return func(name);
}
};
}
void
UpdateFile(ArchiveEx::Archive& archive, const std::string& path, bool warn)
{
const auto status = fs::status(path);
switch (status.type()) {
case fs::file_type::regular:
archive.Insert(path.c_str());
break;
case fs::file_type::directory:
for (const auto& entry : fs::directory_iterator{path})
UpdateFile(archive, entry.path().string(), false);
break;
default:
if (warn)
std::cerr << "unsupported file type: " << path << std::endl;
break;
}
}
void
ExtractFile(ArchiveEx::Archive& archive, const char* filepath)
try {
fs::path path{filepath};
std::uint8_t* tmp{nullptr};
const int length = archive.Extract(filepath, tmp);
if (0 > length)
throw ExtractError();
std::unique_ptr<std::uint8_t[]> buf{tmp};
std::error_code err{};
if (path.has_parent_path())
fs::create_directories(path.parent_path(), err);
if (err)
throw ExtractError();
std::ofstream file{path};
if (!file.is_open())
throw ExtractError();
file.write(reinterpret_cast<const char*>(buf.get()), length);
}
catch (const ExtractError& err) {
std::cerr << "could not extract: " << filepath << std::endl;
}
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