2 Copyright (C) 2022 Carl Hetherington <cth@carlh.net>
4 This file is part of libdcp.
6 libdcp is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or
9 (at your option) any later version.
11 libdcp is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with libdcp. If not, see <http://www.gnu.org/licenses/>.
19 In addition, as a special exception, the copyright holders give
20 permission to link the code of portions of this program with the
21 OpenSSL library under certain conditions as described in each
22 individual source file, and distribute linked combinations
25 You must obey the GNU General Public License in all respects
26 for all of the code used other than OpenSSL. If you modify
27 file(s) with this exception, you may extend this exception to your
28 version of the file(s), but you are not obligated to do so. If you
29 do not wish to do so, delete this exception statement from your
30 version. If you delete this exception statement from all source
31 files in the program, then also delete it here.
35 #include "dcp_assert.h"
37 #include <boost/algorithm/string.hpp>
39 #include <errhandlingapi.h>
53 File::File(boost::filesystem::path path, std::string mode)
58 std::wstring mode_wide(mode.begin(), mode.end());
59 /* c_str() here should give a UTF-16 string */
60 _file = _wfopen(fix_long_path(path).c_str(), mode_wide.c_str());
62 _open_error = GetLastError();
65 _file = fopen(path.c_str(), mode.c_str());
73 File::File(File&& other)
76 , _open_error(other._open_error)
78 other._file = nullptr;
83 File::operator=(File&& other)
88 _open_error = other._open_error;
89 other._file = nullptr;
106 File::write(const void *ptr, size_t size, size_t nmemb)
109 return fwrite(ptr, size, nmemb, _file);
114 File::read(void *ptr, size_t size, size_t nmemb)
117 return fread(ptr, size, nmemb, _file);
130 File::gets(char* s, int size)
133 return fgets(s, size, _file);
138 File::puts(char const* s)
141 return fputs(s, _file);
145 File::operator bool() const
147 return _file != nullptr;
152 File::checked_write(void const * ptr, size_t size)
154 size_t N = write(ptr, 1, size);
157 throw FileError("fwrite error", _path, errno);
159 throw FileError("Unexpected short write", _path, 0);
166 File::checked_read(void* ptr, size_t size)
168 size_t N = read(ptr, 1, size);
171 throw FileError("fread error %1", _path, errno);
173 throw FileError("Unexpected short read", _path, 0);
189 File::seek(int64_t offset, int whence)
192 #ifdef LIBDCP_WINDOWS
193 return _fseeki64(_file, offset, whence);
195 return fseek(_file, offset, whence);
204 #ifdef LIBDCP_WINDOWS
205 return _ftelli64(_file);
217 return ferror(_file);
221 /** Windows can't "by default" cope with paths longer than 260 characters, so if you pass such a path to
222 * any boost::filesystem method it will fail. There is a "fix" for this, which is to prepend
223 * the string \\?\ to the path. This will make it work, so long as:
224 * - the path is absolute.
225 * - the path only uses backslashes.
226 * - individual path components are "short enough" (probably less than 255 characters)
228 * See https://www.boost.org/doc/libs/1_57_0/libs/filesystem/doc/reference.html under
229 * "Warning: Long paths on Windows" for some details.
231 * Our fopen_boost uses this method to get this fix, but any other calls to boost::filesystem
232 * will not unless this method is explicitly called to pre-process the pathname.
234 boost::filesystem::path
235 dcp::fix_long_path (boost::filesystem::path long_path)
237 #ifdef LIBDCP_WINDOWS
238 using namespace boost::filesystem;
240 if (boost::algorithm::starts_with(long_path.string(), "\\\\")) {
241 /* This could mean it starts with \\ (i.e. a SMB path) or \\?\ (a long path)
242 * or a variety of other things... anyway, we'll leave it alone.
247 /* We have to make the path canonical but we can't call canonical() on the long path
248 * as it will fail. So we'll sort of do it ourselves (possibly badly).
250 path fixed = "\\\\?\\";
251 if (long_path.is_absolute()) {
252 fixed += long_path.make_preferred();
254 fixed += boost::filesystem::current_path() / long_path.make_preferred();