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fs: add long path support on Windows

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Extend path limit with \\?\ prefix.
This commit is contained in:
Nekotekina 2019-10-13 20:22:29 +03:00
parent 4d0291ed71
commit 6b1df1ce31
1 changed files with 13 additions and 3 deletions
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16
Utilities/File.cpp
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@ -27,9 +27,15 @@ static std::unique_ptr<wchar_t[]> to_wchar(const std::string& source)
const int size = narrow<int>(buf_size, "to_wchar" HERE);
// Buffer for max possible output length
std::unique_ptr<wchar_t[]> buffer(new wchar_t[buf_size]);
std::unique_ptr<wchar_t[]> buffer(new wchar_t[buf_size + 4 + 32768]);
verify("to_wchar" HERE), MultiByteToWideChar(CP_UTF8, 0, source.c_str(), size, buffer.get(), size);
// Prepend wide path prefix (4 characters)
std::memcpy(buffer.get() + 32768, L"\\\\\?\\", 4 * sizeof(wchar_t));
verify("to_wchar" HERE), MultiByteToWideChar(CP_UTF8, 0, source.c_str(), size, buffer.get() + 32768 + 4, size);
// Canonicalize wide path (replace '/', ".", "..", \\ repetitions, etc)
verify("to_wchar" HERE), GetFullPathNameW(buffer.get() + 32768, 32768, buffer.get(), nullptr) - 1 < 32768 - 1;
return buffer;
}
@ -486,7 +492,11 @@ bool fs::statfs(const std::string& path, fs::device_stat& info)
ULARGE_INTEGER total_size;
ULARGE_INTEGER total_free;
if (!GetDiskFreeSpaceExW(to_wchar(path).get(), &avail_free, &total_size, &total_free))
// Get disk letter from path (TODO)
std::wstring disk(L"C:");
disk[0] = path[0];
if (!GetDiskFreeSpaceExW(disk.c_str(), &avail_free, &total_size, &total_free))
{
g_tls_error = to_error(GetLastError());
return false;