+/*
+ 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/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;
+ _zip = zip_open(dcp::filesystem::fix_long_path(file).string().c_str(), ZIP_RDONLY, &error);
+ if (!_zip) {
+ throw FileError("could not open ZIP file", file);
+ }
+}
+
+
+Unzipper::~Unzipper()
+{
+ zip_close(_zip);
+}
+
+
+string
+Unzipper::get(string const& filename)
+{
+ auto file = zip_fopen(_zip, filename.c_str(), 0);
+ if (!file) {
+ throw runtime_error(String::compose(_("Could not find file %1 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);
+}
+