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// Copyright 2008 Dolphin Emulator Project
// SPDX-License-Identifier: GPL-2.0-or-later
#include "Common/FileSearch.h"
#include <algorithm>
#include <functional>
#include <iterator>
#include "Common/CommonPaths.h"
#include "Common/StringUtil.h"
#ifdef _MSC_VER
#include <Windows.h>
#include <filesystem>
namespace fs = std::filesystem;
#define HAS_STD_FILESYSTEM
#else
#ifdef ANDROID
#include "jni/AndroidCommon/AndroidCommon.h"
#endif
#include <cstring>
#include "Common/CommonFuncs.h"
#include "Common/FileUtil.h"
#endif
namespace Common
{
#ifndef HAS_STD_FILESYSTEM
static void FileSearchWithTest(const std::string& directory, bool recursive,
std::vector<std::string>* result_out,
std::function<bool(const File::FSTEntry&)> callback)
{
File::FSTEntry top = File::ScanDirectoryTree(directory, recursive);
const std::function<void(File::FSTEntry&)> DoEntry = [&](File::FSTEntry& entry) {
if (callback(entry))
result_out->push_back(entry.physicalName);
for (auto& child : entry.children)
DoEntry(child);
};
for (auto& child : top.children)
DoEntry(child);
}
std::vector<std::string> DoFileSearch(const std::vector<std::string>& directories,
const std::vector<std::string>& exts, bool recursive)
{
std::vector<std::string> result;
bool accept_all = exts.empty();
const auto callback = [&exts, accept_all](const File::FSTEntry& entry) {
if (accept_all)
return true;
if (entry.isDirectory)
return false;
return std::any_of(exts.begin(), exts.end(), [&](const std::string& ext) {
const std::string& name = entry.virtualName;
return name.length() >= ext.length() &&
strcasecmp(name.c_str() + name.length() - ext.length(), ext.c_str()) == 0;
});
};
for (const std::string& directory : directories)
{
#ifdef ANDROID
// While File::ScanDirectoryTree (which is called in FileSearchWithTest) does handle Android
// content correctly, having a specialized implementation of DoFileSearch for Android content
// provides a much needed performance boost. Also, this specialized implementation will be
// required if we in the future replace the use of File::ScanDirectoryTree with std::filesystem.
if (IsPathAndroidContent(directory))
{
const std::vector<std::string> partial_result =
DoFileSearchAndroidContent(directory, exts, recursive);
result.insert(result.end(), std::make_move_iterator(partial_result.begin()),
std::make_move_iterator(partial_result.end()));
}
else
#endif
{
FileSearchWithTest(directory, recursive, &result, callback);
}
}
// remove duplicates
std::sort(result.begin(), result.end());
result.erase(std::unique(result.begin(), result.end()), result.end());
return result;
}
#else
std::vector<std::string> DoFileSearch(const std::vector<std::string>& directories,
const std::vector<std::string>& exts, bool recursive)
{
bool accept_all = exts.empty();
std::vector<fs::path> native_exts;
for (const auto& ext : exts)
native_exts.push_back(StringToPath(ext));
// N.B. This avoids doing any copies
auto ext_matches = [&native_exts](const fs::path& path) {
const auto& native_path = path.native();
return std::any_of(native_exts.cbegin(), native_exts.cend(), [&native_path](const auto& ext) {
// TODO provide cross-platform compat for the comparison function, once more platforms
// support std::filesystem
int compare_len = static_cast<int>(ext.native().length());
return native_path.length() >= compare_len &&
CompareStringOrdinal(&native_path.c_str()[native_path.length() - compare_len],
compare_len, ext.c_str(), compare_len, TRUE) == CSTR_EQUAL;
});
};
std::vector<std::string> result;
auto add_filtered = [&](const fs::directory_entry& entry) {
auto& path = entry.path();
if (accept_all || (ext_matches(path) && !fs::is_directory(path)))
result.emplace_back(PathToString(path));
};
for (const auto& directory : directories)
{
fs::path directory_path = StringToPath(directory);
if (fs::is_directory(directory_path)) // Can't create iterators for non-existant directories
{
if (recursive)
{
// TODO use fs::directory_options::follow_directory_symlink ?
for (auto& entry : fs::recursive_directory_iterator(std::move(directory_path)))
add_filtered(entry);
}
else
{
for (auto& entry : fs::directory_iterator(std::move(directory_path)))
add_filtered(entry);
}
}
}
// Remove duplicates (occurring because caller gave e.g. duplicate or overlapping directories -
// not because std::filesystem returns duplicates). Also note that this pathname-based uniqueness
// isn't as thorough as std::filesystem::equivalent.
std::sort(result.begin(), result.end());
result.erase(std::unique(result.begin(), result.end()), result.end());
// Dolphin expects to be able to use "/" (DIR_SEP) everywhere.
// std::filesystem uses the OS separator.
constexpr fs::path::value_type os_separator = fs::path::preferred_separator;
static_assert(os_separator == DIR_SEP_CHR || os_separator == '\\', "Unsupported path separator");
if constexpr (os_separator != DIR_SEP_CHR)
{
for (auto& path : result)
std::replace(path.begin(), path.end(), '\\', DIR_SEP_CHR);
}
return result;
}
#endif
} // namespace Common
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