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/*
Copyright (C) 2024 Carl Hetherington <cth@carlh.net>
This file is part of DCP-o-matic.
DCP-o-matic is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
DCP-o-matic is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with DCP-o-matic. If not, see <http://www.gnu.org/licenses/>.
*/
#include "dcpomatic_assert.h"
#include "exceptions.h"
#include "unzipper.h"
#include <dcp/array_data.h>
#include <dcp/filesystem.h>
#include <dcp/scope_guard.h>
#include <zip.h>
#include <boost/filesystem.hpp>
#include <stdexcept>
#include "i18n.h"
using std::runtime_error;
using std::shared_ptr;
using std::string;
Unzipper::Unzipper(boost::filesystem::path file)
{
int error;
#ifdef DCPOMATIC_HAVE_ZIP_RDONLY
_zip = zip_open(dcp::filesystem::fix_long_path(file).string().c_str(), ZIP_RDONLY, &error);
#else
_zip = zip_open(dcp::filesystem::fix_long_path(file).string().c_str(), 0, &error);
#endif
if (!_zip) {
throw FileError("could not open ZIP file", file);
}
}
Unzipper::~Unzipper()
{
zip_close(_zip);
}
bool
Unzipper::contains(string const& filename) const
{
auto file = zip_fopen(_zip, filename.c_str(), 0);
bool exists = file != nullptr;
if (file) {
zip_fclose(file);
}
return exists;
}
string
Unzipper::get(string const& filename) const
{
auto file = zip_fopen(_zip, filename.c_str(), 0);
if (!file) {
throw runtime_error(fmt::format(_("Could not find file {} in ZIP file"), filename));
}
dcp::ScopeGuard sg = [file]() { zip_fclose(file); };
int constexpr maximum = 65536;
dcp::ArrayData data(maximum);
int remaining = maximum;
uint8_t* next = data.data();
while (remaining > 0) {
auto read = zip_fread(file, next, remaining);
if (read == 0) {
break;
} else if (read == -1) {
throw runtime_error("Could not read from ZIP file");
}
next += read;
remaining -= read;
}
if (remaining == 0) {
throw runtime_error("File from ZIP is too big");
}
return string(reinterpret_cast<char*>(data.data()), maximum - remaining);
}
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