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// Copyright 2021 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// Source for various utility functions related to reading and writing files
// and vectors. Would be much simpler if Android and Windows supported File.
#include "sparse_matmul/layers/utils.h"
#ifdef _WIN32
#include <Windows.h>
#include <codecvt>
#include <mutex> // NOLINT
#else
#include <dirent.h>
#endif // _WIN32
#include <string>
#include <vector>
#include "absl/status/status.h"
#include "absl/strings/str_cat.h"
#include "absl/strings/substitute.h"
namespace csrblocksparse {
namespace {
// Helper to test if a filename is "." or "..".
template <typename CharType>
bool IsDotOrDotDot(const CharType* filename) {
if (filename[0] == '.') {
if (filename[1] == '\0') {
return true;
}
if (filename[1] == '.' && filename[2] == '\0') {
return true;
}
}
return false;
}
#ifdef _WIN32 // We only define these conversion routines on Win32.
static std::mutex g_converter_mutex;
static std::wstring_convert<std::codecvt_utf8_utf16<wchar_t>> g_converter;
std::string Narrow(const std::wstring& wide) {
std::lock_guard<std::mutex> auto_lock(g_converter_mutex);
return g_converter.to_bytes(wide);
}
std::wstring Widen(const std::string& narrow) {
std::lock_guard<std::mutex> auto_lock(g_converter_mutex);
return g_converter.from_bytes(narrow);
}
inline constexpr char kLongPathPrefix[] = R"(\\?\)";
std::wstring ConvertToWindowsPathFormat(const std::string& path,
int max_path_length = MAX_PATH) {
if (path.length() + 1 > max_path_length &&
!absl::StartsWith(path, kLongPathPrefix)) {
return Widen(absl::StrCat(kLongPathPrefix, path));
}
return Widen(path);
}
#endif // _WIN32
} // namespace
// Return all files in a given directory.
absl::Status FilesInDirectory(const std::string& path,
const std::string& must_contain,
std::vector<std::string>* result) {
#ifdef _WIN32
WIN32_FIND_DATAW child_data;
HANDLE find_handle = FindFirstFileW(
ConvertToWindowsPathFormat(absl::StrCat(path, "\\*")).c_str(),
&child_data);
if (find_handle == INVALID_HANDLE_VALUE) {
return absl::UnknownError(
absl::Substitute("Couldn't open: $0 (error $1)", path, GetLastError()));
}
do {
if (IsDotOrDotDot(child_data.cFileName)) continue;
const std::string name = Narrow(child_data.cFileName);
if (name.find(must_contain) == std::string::npos) continue;
result->push_back(name);
} while (FindNextFileW(find_handle, &child_data) != 0);
const auto err = GetLastError();
FindClose(find_handle);
if (err != ERROR_NO_MORE_FILES)
return absl::UnknownError(
absl::Substitute("Error in FindNextFileW: $0", err));
#else
DIR* dirp = opendir(path.c_str());
if (dirp == nullptr) {
return absl::UnknownError(absl::Substitute("Couldn't open: $0", path));
}
dirent* dp;
errno = 0;
while ((dp = readdir(dirp)) != nullptr) {
if (IsDotOrDotDot(dp->d_name)) continue;
const std::string name(dp->d_name);
if (name.find(must_contain) == std::string::npos) continue;
result->push_back(name);
}
closedir(dirp);
if (errno != 0)
return absl::UnknownError(absl::Substitute("Error in readdir: $0", errno));
#endif // _WIN32
return absl::OkStatus();
}
} // namespace csrblocksparse
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