nextcloud-desktop/shell_integration/windows/OCUtil/StringUtil.h
Jocelyn Turcotte 47fbfbc006 shell/Windows: Avoid memory allocations and copies when querying icons
IsMemberOf is called for every file (in the ownCloud directory or not) and
with every instance of OCOverlay (we have 5) when displaying a list of
files in Explorer.

Refactor the code to avoid copying the list of watched directories, as
well as creating a wstring from a PWWSTR for files outside watched
directories.

Also change some calls of begin_with to use isDescendantOf since it
properly handles parent paths not ending with a backslash, which could
lead to SocketAPI queries for sibling folders with a name that starts with
a watched folder name.
2017-01-18 12:15:52 +01:00

49 lines
1.7 KiB
C++

/**
* Copyright (c) 2014 ownCloud GmbH. All rights reserved.
*
* This library is free software; you can redistribute it and/or modify it under
* the terms of the GNU Lesser General Public License as published by the Free
* Software Foundation; version 2.1 of the License
*
* This library is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
* FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
* details.
*/
#ifndef STRINGUTIL_H
#define STRINGUTIL_H
#pragma once
#include <string>
class __declspec(dllexport) StringUtil {
public:
static std::string toUtf8(const wchar_t* utf16, int len = -1);
static std::wstring toUtf16(const char* utf8, int len = -1);
template<class T>
static bool begins_with(const T& input, const T& match)
{
return input.size() >= match.size()
&& std::equal(match.begin(), match.end(), input.begin());
}
static bool isDescendantOf(const std::wstring& child, const std::wstring& parent) {
return isDescendantOf(child.c_str(), child.size(), parent.c_str(), parent.size());
}
static bool isDescendantOf(PCWSTR child, size_t childLength, const std::wstring& parent) {
return isDescendantOf(child, childLength, parent.c_str(), parent.size());
}
static bool isDescendantOf(PCWSTR child, size_t childLength, PCWSTR parent, size_t parentLength) {
if (!parentLength)
return false;
return (childLength == parentLength || childLength > parentLength && (child[parentLength] == L'\\' || child[parentLength - 1] == L'\\'))
&& wcsncmp(child, parent, parentLength) == 0;
}
};
#endif // STRINGUTIL_H