#include "config.h"
#include "exceptions.h"
#include "dcpomatic_assert.h"
+#include "util.h"
#include <dcp/raw_convert.h>
#include <glib.h>
extern "C" {
#endif
+/** Windows can't "by default" cope with paths longer than 260 characters, so if you pass such a path to
+ * any boost::filesystem method it will fail. There is a "fix" for this, which is to prepend
+ * the string \\?\ to the path. This will make it work, so long as:
+ * - the path is absolute.
+ * - the path only uses backslashes.
+ * - individual path components are "short enough" (probably less than 255 characters)
+ *
+ * See https://www.boost.org/doc/libs/1_57_0/libs/filesystem/doc/reference.html under
+ * "Warning: Long paths on Windows" for some details.
+ *
+ * Our fopen_boost uses this method to get this fix, but any other calls to boost::filesystem
+ * will not unless this method is explicitly called to pre-process the pathname.
+ */
+boost::filesystem::path
+fix_long_path (boost::filesystem::path long_path)
+{
+ using namespace boost::filesystem;
+ path fixed = "\\\\?\\";
+ /* We have to make the path canonical but we can't call canonical() on the long path
+ * as it will fail. So we'll sort of do it ourselves (possibly badly).
+ */
+ if (long_path.is_absolute()) {
+ fixed += long_path.make_preferred();
+ } else {
+ fixed += boost::filesystem::current_path() / long_path.make_preferred();
+ }
+ return fixed;
+}
+
+
/* Apparently there is no way to create an ofstream using a UTF-8
filename under Windows. We are hence reduced to using fopen
with this wrapper.
fopen_boost (boost::filesystem::path p, string t)
{
wstring w (t.begin(), t.end());
- /* c_str() here should give a UTF-16 string */
- return _wfopen (p.c_str(), w.c_str ());
+ /* c_str() on fixed here should give a UTF-16 string */
+ return _wfopen (fix_long_path(p).c_str(), w.c_str());
}
--- /dev/null
+/*
+ Copyright (C) 2021 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 "lib/cross.h"
+#include "lib/util.h"
+#include <boost/filesystem.hpp>
+#include <boost/test/unit_test.hpp>
+#include <iostream>
+
+
+BOOST_AUTO_TEST_CASE (fix_long_path_test)
+{
+#ifdef DCPOMATIC_WINDOWS
+ BOOST_CHECK_EQUAL (fix_long_path("c:\\foo"), "\\\\?\\c:\\foo");
+ BOOST_CHECK_EQUAL (fix_long_path("c:\\foo\\bar"), "\\\\?\\c:\\foo\\bar");
+ boost::filesystem::path fixed_bar = "\\\\?\\";
+ fixed_bar += boost::filesystem::current_path();
+ fixed_bar /= "bar";
+ BOOST_CHECK_EQUAL (fix_long_path("bar"), fixed_bar);
+#else
+ BOOST_CHECK_EQUAL (fix_long_path("foo/bar/baz"), "foo/bar/baz");
+#endif
+}
+
+
+#ifdef DCPOMATIC_WINDOWS
+BOOST_AUTO_TEST_CASE (windows_long_filename_test)
+{
+ using namespace boost::filesystem;
+
+ path too_long = current_path() / "build\\test\\a\\really\\very\\long\\filesystem\\path\\indeed\\that\\will\\be\\so\\long\\that\\windows\\cannot\\normally\\cope\\with\\it\\unless\\we\\add\\this\\crazy\\prefix\\and\\then\\magically\\it\\can\\do\\it\\fine\\I\\dont\\really\\know\\why\\its\\like\\that\\but\\hey\\it\\is\\so\\here\\we\\are\\what\\can\\we\\do\\other\\than\\bodge\\it";
+
+ BOOST_CHECK (too_long.string().length() > 260);
+ boost::system::error_code ec;
+ create_directories (too_long, ec);
+ BOOST_CHECK (ec);
+
+ path fixed_path = fix_long_path(too_long);
+ create_directories (fixed_path, ec);
+ BOOST_CHECK (!ec);
+
+ auto file = fopen_boost(too_long / "hello", "w");
+ BOOST_REQUIRE (file);
+ fprintf (file, "Hello_world");
+ fclose (file);
+
+ file = fopen_boost(too_long / "hello", "r");
+ BOOST_REQUIRE (file);
+ char buffer[64];
+ fscanf (file, "%63s", buffer);
+ BOOST_CHECK_EQUAL (strcmp(buffer, "Hello_world"), 0);
+}
+#endif
+