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"
48 File::File(boost::filesystem::path path, std::string mode)
52 std::wstring mode_wide(mode.begin(), mode.end());
53 /* c_str() here should give a UTF-16 string */
54 _file = _wfopen(fix_long_path(path).c_str(), mode_wide.c_str());
56 _file = fopen(path.c_str(), mode.c_str());
72 File::write(const void *ptr, size_t size, size_t nmemb)
75 return fwrite(ptr, size, nmemb, _file);
80 File::read(void *ptr, size_t size, size_t nmemb)
83 return fread(ptr, size, nmemb, _file);
96 File::gets(char *s, int size)
99 return fgets(s, size, _file);
103 File::operator bool() const
105 return _file != nullptr;
110 File::checked_write(void const * ptr, size_t size)
112 size_t N = write(ptr, 1, size);
115 throw FileError("fwrite error", _path, errno);
117 throw FileError("Unexpected short write", _path, 0);
124 File::checked_read(void* ptr, size_t size)
126 size_t N = read(ptr, 1, size);
129 throw FileError("fread error %1", _path, errno);
131 throw FileError("Unexpected short read", _path, 0);
147 File::seek(int64_t offset, int whence)
150 #ifdef LIBDCP_WINDOWS
151 return fseeki64(_file, offset, whence);
153 return fseek(_file, offset, whence);
158 /** Windows can't "by default" cope with paths longer than 260 characters, so if you pass such a path to
159 * any boost::filesystem method it will fail. There is a "fix" for this, which is to prepend
160 * the string \\?\ to the path. This will make it work, so long as:
161 * - the path is absolute.
162 * - the path only uses backslashes.
163 * - individual path components are "short enough" (probably less than 255 characters)
165 * See https://www.boost.org/doc/libs/1_57_0/libs/filesystem/doc/reference.html under
166 * "Warning: Long paths on Windows" for some details.
168 * Our fopen_boost uses this method to get this fix, but any other calls to boost::filesystem
169 * will not unless this method is explicitly called to pre-process the pathname.
171 boost::filesystem::path
172 dcp::fix_long_path (boost::filesystem::path long_path)
174 #ifdef LIBDCP_WINDOWS
175 using namespace boost::filesystem;
177 if (boost::algorithm::starts_with(long_path.string(), "\\\\")) {
178 /* This could mean it starts with \\ (i.e. a SMB path) or \\?\ (a long path)
179 * or a variety of other things... anyway, we'll leave it alone.
184 /* We have to make the path canonical but we can't call canonical() on the long path
185 * as it will fail. So we'll sort of do it ourselves (possibly badly).
187 path fixed = "\\\\?\\";
188 if (long_path.is_absolute()) {
189 fixed += long_path.make_preferred();
191 fixed += boost::filesystem::current_path() / long_path.make_preferred();