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Fix long path support on Windows for UNC path

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Such as network locations.
This commit is contained in:
Nekotekina 2019-10-27 18:39:29 +03:00
parent 65e47490c4
commit 839e088ae5
1 changed files with 11 additions and 2 deletions
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13
Utilities/File.cpp
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@ -27,12 +27,21 @@ static std::unique_ptr<wchar_t[]> to_wchar(const std::string& source)
const int size = narrow<int>(buf_size, "to_wchar" HERE); const int size = narrow<int>(buf_size, "to_wchar" HERE);
// Buffer for max possible output length // Buffer for max possible output length
std::unique_ptr<wchar_t[]> buffer(new wchar_t[buf_size + 4 + 32768]); std::unique_ptr<wchar_t[]> buffer(new wchar_t[buf_size + 8 + 32768]);
// Prepend wide path prefix (4 characters) // Prepend wide path prefix (4 characters)
std::memcpy(buffer.get() + 32768, L"\\\\\?\\", 4 * sizeof(wchar_t)); 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); // Test whether additional UNC prefix is required
const bool unc = source.size() > 2 && (source[0] == '\\' || source[0] == '/') && source[1] == source[0];
if (unc)
{
// Use \\?\UNC\ prefix
std::memcpy(buffer.get() + 32768 + 4, L"UNC\\", 4 * sizeof(wchar_t));
}
verify("to_wchar" HERE), MultiByteToWideChar(CP_UTF8, 0, source.c_str(), size, buffer.get() + 32768 + (unc ? 8 : 4), size);
// Canonicalize wide path (replace '/', ".", "..", \\ repetitions, etc) // Canonicalize wide path (replace '/', ".", "..", \\ repetitions, etc)
verify("to_wchar" HERE), GetFullPathNameW(buffer.get() + 32768, 32768, buffer.get(), nullptr) - 1 < 32768 - 1; verify("to_wchar" HERE), GetFullPathNameW(buffer.get() + 32768, 32768, buffer.get(), nullptr) - 1 < 32768 - 1;