osd_file::error osd_file::open(std::string const &orig_path, UINT32 openflags, ptr &file, std::uint64_t &filesize)
{
std::string path;
try {
osd_subst_env(path, orig_path);
}
catch (...) {
return error::OUT_OF_MEMORY;
}
if (win_check_socket_path(path))
return win_open_socket(path, openflags, file, filesize);
else if (win_check_ptty_path(path))
return win_open_ptty(path, openflags, file, filesize);
// convert path to TCHAR
TCHAR *t_path = tstring_from_utf8(path.c_str());
osd_disposer<TCHAR> t_path_disposer(t_path);
if (!t_path)
return error::OUT_OF_MEMORY;
// convert the path into something Windows compatible
for (TCHAR *src = t_path; *src != 0; src++)
*src = /* ('/' == *src) ? '\\' : */ *src;
// select the file open modes
DWORD disposition, access, sharemode;
if (openflags & OPEN_FLAG_WRITE)
{
disposition = (!is_path_to_physical_drive(path.c_str()) && (openflags & OPEN_FLAG_CREATE)) ? CREATE_ALWAYS : OPEN_EXISTING;
access = (openflags & OPEN_FLAG_READ) ? (GENERIC_READ | GENERIC_WRITE) : GENERIC_WRITE;
sharemode = FILE_SHARE_READ;
}
else if (openflags & OPEN_FLAG_READ)
{
disposition = OPEN_EXISTING;
access = GENERIC_READ;
sharemode = FILE_SHARE_READ;
}
else
{
return error::INVALID_ACCESS;
}
// attempt to open the file
HANDLE h = CreateFile(t_path, access, sharemode, nullptr, disposition, 0, nullptr);
if (INVALID_HANDLE_VALUE == h)
{
DWORD err = GetLastError();
// create the path if necessary
if ((ERROR_PATH_NOT_FOUND == err) && (openflags & OPEN_FLAG_CREATE) && (openflags & OPEN_FLAG_CREATE_PATHS))
{
TCHAR *pathsep = _tcsrchr(t_path, '\\');
if (pathsep != nullptr)
{
// create the path up to the file
*pathsep = 0;
err = create_path_recursive(t_path);
*pathsep = '\\';
// attempt to reopen the file
if (err == NO_ERROR)
{
h = CreateFile(t_path, access, sharemode, nullptr, disposition, 0, nullptr);
err = GetLastError();
}
}
}
// if we still failed, clean up and free
if (INVALID_HANDLE_VALUE == h)
return win_error_to_file_error(err);
}
// get the file size
DWORD upper, lower;
lower = GetFileSize(h, &upper);
if (INVALID_FILE_SIZE == lower)
{
DWORD const err = GetLastError();
if (NO_ERROR != err)
{
CloseHandle(h);
return win_error_to_file_error(err);
}
}
try
{
file = std::make_unique<win_osd_file>(h);
filesize = (std::uint64_t(upper) << 32) | lower;
return error::NONE;
}
catch (...)
{
CloseHandle(h);
return error::OUT_OF_MEMORY;
}
}
osd_file::error osd_file::open(std::string const &orig_path, uint32_t openflags, ptr &file, std::uint64_t &filesize)
{
std::string path;
try {
osd_subst_env(path, orig_path);
}
catch (...) {
return error::OUT_OF_MEMORY;
}
if (win_check_socket_path(path))
return win_open_socket(path, openflags, file, filesize);
else if (win_check_ptty_path(path))
return win_open_ptty(path, openflags, file, filesize);
// convert path to TCHAR
osd::text::tstring t_path = osd::text::to_tstring(path);
// convert the path into something Windows compatible (the actual interesting part appears
// to have been commented out???)
for (auto iter = t_path.begin(); iter != t_path.end(); iter++)
*iter = /* ('/' == *iter) ? '\\' : */ *iter;
// select the file open modes
DWORD disposition, access, sharemode;
if (openflags & OPEN_FLAG_WRITE)
{
disposition = (!is_path_to_physical_drive(path.c_str()) && (openflags & OPEN_FLAG_CREATE)) ? CREATE_ALWAYS : OPEN_EXISTING;
access = (openflags & OPEN_FLAG_READ) ? (GENERIC_READ | GENERIC_WRITE) : GENERIC_WRITE;
sharemode = FILE_SHARE_READ;
}
else if (openflags & OPEN_FLAG_READ)
{
disposition = OPEN_EXISTING;
access = GENERIC_READ;
sharemode = FILE_SHARE_READ;
}
else
{
return error::INVALID_ACCESS;
}
// attempt to open the file
HANDLE h = CreateFile(t_path.c_str(), access, sharemode, nullptr, disposition, 0, nullptr);
if (INVALID_HANDLE_VALUE == h)
{
DWORD err = GetLastError();
// create the path if necessary
if ((ERROR_PATH_NOT_FOUND == err) && (openflags & OPEN_FLAG_CREATE) && (openflags & OPEN_FLAG_CREATE_PATHS))
{
auto pathsep = t_path.rfind('\\');
if (pathsep != decltype(t_path)::npos)
{
// create the path up to the file
t_path[pathsep] = 0;
err = create_path_recursive(&t_path[0]);
t_path[pathsep] = '\\';
// attempt to reopen the file
if (err == NO_ERROR)
{
h = CreateFile(t_path.c_str(), access, sharemode, nullptr, disposition, 0, nullptr);
err = GetLastError();
}
}
}
// if we still failed, clean up and free
if (INVALID_HANDLE_VALUE == h)
return win_error_to_file_error(err);
}
// get the file size
DWORD upper, lower;
lower = GetFileSize(h, &upper);
if (INVALID_FILE_SIZE == lower)
{
DWORD const err = GetLastError();
if (NO_ERROR != err)
{
CloseHandle(h);
return win_error_to_file_error(err);
}
}
try
{
file = std::make_unique<win_osd_file>(h);
filesize = (std::uint64_t(upper) << 32) | lower;
return error::NONE;
}
catch (...)
{
CloseHandle(h);
return error::OUT_OF_MEMORY;
}
}
