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path.h
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path.h
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/**
* @file : path.h
* @target : windows or linux or mac os
* @details : 在on inux,Windows,MacOS平台上操作文件路径
* @author : cuixingxing
* @email : cuixingxing150@gmail.com
* @date : 17-Mar-2022 12:02:52
* @version : V1.0.0
* @copyright : Copyright (C) 2022 cuixingxing.All rights reserved.
*/
//////////////////////////////////Example////////////////////////////////////////////////////////////
// #include <iostream>
// #include "c_cpp_utils/path.h"
// using namespace std;
// using namespace filesystem;
// int main(int argc, char **argv) {
// #if !defined(WIN32)
// path path1("/dir 1/dir 2/");
// #else
// path path1("C:\\dir 1\\dir 2\\");
// #endif
// path path2("dir 3");
// cout << path1.exists() << endl;
// cout << path1 << endl;
// cout << (path1 / path2) << endl;
// cout << (path1 / path2).parent_path() << endl;
// cout << (path1 / path2).parent_path().parent_path() << endl;
// cout << (path1 / path2).parent_path().parent_path().parent_path() << endl;
// cout << (path1 / path2).parent_path().parent_path().parent_path().parent_path() << endl;
// cout << path().parent_path() << endl;
// cout << "some/path.ext:operator==() = " << (path("some/path.ext") == path("some/path.ext")) << endl;
// cout << "some/path.ext:operator==()
// (unequal) = " << (path(" some / path.ext ") == path(" another / path.ext ")) << endl;
// cout
// << "nonexistant:exists = " << path("nonexistant").exists() << endl;
// cout << "nonexistant:is_file = " << path("nonexistant").is_file() << endl;
// cout << "nonexistant:is_directory = " << path("nonexistant").is_directory() << endl;
// cout << "nonexistant:filename
// = " << path(" nonexistant
// ").filename() << endl; cout <<
// "nonexistant:extension = "
// << path("nonexistant").extension() << endl;
// cout << "filesystem/path.h:exists = " << path("filesystem/path.h").exists() << endl;
// cout << "filesystem/path.h:is_file = " << path("filesystem/path.h").is_file() << endl;
// cout << "filesystem/path.h:is_directory = " << path("filesystem/path.h").is_directory() << endl;
// cout << "filesystem/path.h:filename = " << path("filesystem/path.h").filename() << endl;
// cout << "filesystem/path.h:extension = " << path("filesystem/path.h").extension() << endl;
// cout << "filesystem/path.h:make_absolute = " << path("filesystem/path.h").make_absolute() << endl;
// cout << "../filesystem:exists = " << path("../filesystem").exists() << endl;
// cout
// << "../filesystem:is_file = " << path("../filesystem").is_file() << endl;
// cout << "../filesystem:is_directory = " << path("../filesystem").is_directory() << endl;
// cout << "../filesystem:extension = " << path("../filesystem").extension() << endl;
// cout << "../filesystem:filename = " << path("../filesystem").filename() << endl;
// cout << "../filesystem:make_absolute = " << path("../filesystem").make_absolute() << endl;
// cout << "resolve(filesystem/path.h) = " << resolver().resolve("filesystem/path.h") << endl;
// cout << "resolve(nonexistant) = " << resolver().resolve("nonexistant") << endl;
// return 0;
// }
//
////////////////////////////////////////////////////////////////////////////////////////////
#pragma once
#include <dirent.h>
#include <algorithm>
#include <cctype>
#include <cerrno>
#include <cstdlib>
#include <cstring>
#include <regex>
#include <sstream>
#include <stdexcept>
#include <string>
#include <vector>
//#include "fwd.h"
#if defined(_WIN32)
#include <ShlObj.h>
#include <windows.h>
#else
#include <unistd.h>
#endif
#include <sys/stat.h>
#if defined(__linux)
#include <linux/limits.h>
#endif
namespace filesystem {
/**
* @brief Simple class for manipulating paths on Linux/Windows/Mac OS
*
* This class is just a temporary workaround to avoid the heavy boost
* dependency until boost::filesystem is integrated into the standard template
* library at some point in the future.
*/
class path {
public:
enum path_type {
windows_path = 0,
posix_path = 1,
#if defined(_WIN32)
native_path = windows_path
#else
native_path = posix_path
#endif
};
path() : m_type(native_path), m_absolute(false), m_smb(false) {}
path(const path& path)
: m_type(path.m_type),
m_path(path.m_path),
m_absolute(path.m_absolute),
m_smb(path.m_smb) {}
path(path&& path)
: m_type(path.m_type),
m_path(std::move(path.m_path)),
m_absolute(path.m_absolute),
m_smb(path.m_smb) {}
path(const char* string) : m_smb(false) { set(string); }
path(const std::string& string) : m_smb(false) { set(string); }
#if defined(_WIN32)
path(const std::wstring& wstring) { set(wstring); }
path(const wchar_t* wstring) { set(wstring); }
#endif
// 获取path路径有多少个
size_t length() const { return m_path.size(); }
// 判断path是否有路径
bool empty() const { return m_path.empty(); }
//判断是否为绝对路径
bool is_absolute() const { return m_absolute; }
// 获取绝对路径
path make_absolute() const {
#if !defined(_WIN32)
char temp[PATH_MAX];
if (realpath(str().c_str(), temp) == NULL)
throw std::runtime_error("Internal error in realpath(): " +
std::string(strerror(errno)));
return path(temp);
#else
std::wstring value = wstr(), out(MAX_PATH_WINDOWS, '\0');
DWORD length =
GetFullPathNameW(value.c_str(), MAX_PATH_WINDOWS, &out[0], NULL);
if (length == 0)
throw std::runtime_error("Internal error in realpath(): " +
std::to_string(GetLastError()));
return path(out.substr(0, length));
#endif
}
// 判断路径或者文件是否存在
bool exists() const {
#if defined(_WIN32)
return GetFileAttributesW(wstr().c_str()) != INVALID_FILE_ATTRIBUTES;
#else
struct stat sb;
return stat(str().c_str(), &sb) == 0;
#endif
}
// 获取文件大小
size_t file_size() const {
#if defined(_WIN32)
struct _stati64 sb;
if (_wstati64(wstr().c_str(), &sb) != 0)
throw std::runtime_error("path::file_size(): cannot stat file \"" +
str() + "\"!");
#else
struct stat sb;
if (stat(str().c_str(), &sb) != 0)
throw std::runtime_error("path::file_size(): cannot stat file \"" +
str() + "\"!");
#endif
return (size_t)sb.st_size;
}
// 判断path是否为路径
bool is_directory() const {
#if defined(_WIN32)
DWORD result = GetFileAttributesW(wstr().c_str());
if (result == INVALID_FILE_ATTRIBUTES) return false;
return (result & FILE_ATTRIBUTE_DIRECTORY) != 0;
#else
struct stat sb;
if (stat(str().c_str(), &sb)) return false;
return S_ISDIR(sb.st_mode);
#endif
}
// 判断path是否为文件
bool is_file() const {
#if defined(_WIN32)
DWORD attr = GetFileAttributesW(wstr().c_str());
return (attr != INVALID_FILE_ATTRIBUTES &&
(attr & FILE_ATTRIBUTE_DIRECTORY) == 0);
#else
struct stat sb;
if (stat(str().c_str(), &sb)) return false;
return S_ISREG(sb.st_mode);
#endif
}
// 获取扩展名
std::string extension() const {
const std::string& name = filename();
size_t pos = name.find_last_of(".");
if (pos == std::string::npos) return "";
return name.substr(pos + 1);
}
// 获取文件名，包含扩展名
std::string filename() const {
if (empty()) return "";
const std::string& last = m_path[m_path.size() - 1];
return last;
}
// 获取文件名，不包含扩展名
std::string filenameNoExt() const {
if (empty()) return "";
const std::string& last = m_path[m_path.size() - 1];
size_t pos = last.find_last_of(".");
if (pos == std::string::npos) return "";
return last.substr(0, pos);
}
// 获取父路径
path parent_path() const {
path result;
result.m_absolute = m_absolute;
result.m_smb = m_smb;
if (m_path.empty()) {
if (!m_absolute) result.m_path.push_back("..");
}
else {
size_t until = m_path.size() - 1;
for (size_t i = 0; i < until; ++i) result.m_path.push_back(m_path[i]);
}
return result;
}
// 重载文件分隔符
path operator/(const path& other) const {
if (other.m_absolute)
throw std::runtime_error("path::operator/(): expected a relative path!");
if (m_type != other.m_type)
throw std::runtime_error(
"path::operator/(): expected a path of the same type!");
path result(*this);
for (size_t i = 0; i < other.m_path.size(); ++i)
result.m_path.push_back(other.m_path[i]);
return result;
}
// path对象转换为字符串路径
std::string str(path_type type = native_path) const {
std::ostringstream oss;
if (m_absolute) {
if (m_type == posix_path)
oss << "/";
else {
size_t length = 0;
for (size_t i = 0; i < m_path.size(); ++i)
// No special case for the last segment to count the NULL character
length += m_path[i].length() + 1;
if (m_smb) length += 2;
// Windows requires a \\?\ prefix to handle paths longer than MAX_PATH
// (including their null character). NOTE: relative paths >MAX_PATH are
// not supported at all in Windows.
if (length > MAX_PATH_WINDOWS_LEGACY) {
if (m_smb)
oss << "\\\\?\\UNC\\";
else
oss << "\\\\?\\";
}
else if (m_smb)
oss << "\\\\";
}
}
for (size_t i = 0; i < m_path.size(); ++i) {
oss << m_path[i];
if (i + 1 < m_path.size()) {
if (type == posix_path)
oss << '/';
else
oss << '\\';
}
}
return oss.str();
}
void set(const std::string& str, path_type type = native_path) {
m_type = type;
if (type == windows_path) {
std::string tmp = str;
// Long windows paths (sometimes) begin with the prefix \\?\. It should
// only be used when the path is >MAX_PATH characters long, so we remove
// it for convenience and add it back (if necessary) in str()/wstr().
static const std::string LONG_PATH_PREFIX = "\\\\?\\";
if (tmp.length() >= LONG_PATH_PREFIX.length() &&
std::mismatch(std::begin(LONG_PATH_PREFIX),
std::end(LONG_PATH_PREFIX), std::begin(tmp))
.first == std::end(LONG_PATH_PREFIX)) {
tmp.erase(0, LONG_PATH_PREFIX.length());
}
// Special-case handling of absolute SMB paths, which start with the
// prefix "\\".
if (tmp.length() >= 2 && tmp[0] == '\\' && tmp[1] == '\\') {
m_path = {};
tmp.erase(0, 2);
// Interestingly, there is a special-special case where relative paths
// may be specified as beginning with a "\\" when a non-SMB file with a
// more-than-260-characters-long absolute _local_ path is
// double-clicked. This seems to only happen with single-segment
// relative paths, so we can check for this condition by making sure no
// further path separators are present.
if (tmp.find_first_of("/\\") != std::string::npos)
m_absolute = m_smb = true;
else
m_absolute = m_smb = false;
// Special-case handling of absolute SMB paths, which start with the
// prefix "UNC\"
}
else if (tmp.length() >= 4 && tmp[0] == 'U' && tmp[1] == 'N' &&
tmp[2] == 'C' && tmp[3] == '\\') {
m_path = {};
tmp.erase(0, 4);
m_absolute = true;
m_smb = true;
// Special-case handling of absolute local paths, which start with the
// drive letter and a colon "X:\" So that UTF-8 works, do not call
// std::isalpha if the high bit is set, as that causes an assert on
// Windows.
}
else if (tmp.length() >= 3 && ((unsigned char)tmp[0] < 0x80) &&
std::isalpha(tmp[0]) && tmp[1] == ':' &&
(tmp[2] == '\\' || tmp[2] == '/')) {
m_path = { tmp.substr(0, 2) };
tmp.erase(0, 3);
m_absolute = true;
m_smb = false;
// Relative path
}
else {
m_path = {};
m_absolute = false;
m_smb = false;
}
std::vector<std::string> tokenized = tokenize(tmp, "/\\");
m_path.insert(std::end(m_path), std::begin(tokenized),
std::end(tokenized));
}
else {
m_path = tokenize(str, "/");
m_absolute = !str.empty() && str[0] == '/';
}
}
path& operator=(const path& path) {
m_type = path.m_type;
m_path = path.m_path;
m_absolute = path.m_absolute;
m_smb = path.m_smb;
return *this;
}
path& operator=(path&& path) {
if (this != &path) {
m_type = path.m_type;
m_path = std::move(path.m_path);
m_absolute = path.m_absolute;
m_smb = path.m_smb;
}
return *this;
}
friend std::ostream& operator<<(std::ostream& os, const path& path) {
os << path.str();
return os;
}
bool remove_file() {
#if !defined(_WIN32)
return std::remove(str().c_str()) == 0;
#else
return DeleteFileW(wstr().c_str()) != 0;
#endif
}
bool resize_file(size_t target_length) {
#if !defined(_WIN32)
return ::truncate(str().c_str(), (off_t)target_length) == 0;
#else
HANDLE handle = CreateFileW(wstr().c_str(), GENERIC_WRITE, 0, nullptr, 0,
FILE_ATTRIBUTE_NORMAL, nullptr);
if (handle == INVALID_HANDLE_VALUE) return false;
LARGE_INTEGER size;
size.QuadPart = (LONGLONG)target_length;
if (SetFilePointerEx(handle, size, NULL, FILE_BEGIN) == 0) {
CloseHandle(handle);
return false;
}
if (SetEndOfFile(handle) == 0) {
CloseHandle(handle);
return false;
}
CloseHandle(handle);
return true;
#endif
}
static path getcwd() {
#if !defined(_WIN32)
char temp[PATH_MAX];
if (::getcwd(temp, PATH_MAX) == NULL)
throw std::runtime_error("Internal error in getcwd(): " +
std::string(strerror(errno)));
return path(temp);
#else
std::wstring temp(MAX_PATH_WINDOWS, '\0');
if (!_wgetcwd(&temp[0], MAX_PATH_WINDOWS))
throw std::runtime_error("Internal error in getcwd(): " +
std::to_string(GetLastError()));
return path(temp.c_str());
#endif
}
#if defined(_WIN32)
std::wstring wstr(path_type type = native_path) const {
std::string temp = str(type);
int size =
MultiByteToWideChar(CP_UTF8, 0, &temp[0], (int)temp.size(), NULL, 0);
std::wstring result(size, 0);
MultiByteToWideChar(CP_UTF8, 0, &temp[0], (int)temp.size(), &result[0],
size);
return result;
}
void set(const std::wstring& wstring, path_type type = native_path) {
std::string string;
if (!wstring.empty()) {
int size = WideCharToMultiByte(CP_UTF8, 0, &wstring[0],
(int)wstring.size(), NULL, 0, NULL, NULL);
string.resize(size, 0);
WideCharToMultiByte(CP_UTF8, 0, &wstring[0], (int)wstring.size(),
&string[0], size, NULL, NULL);
}
set(string, type);
}
path& operator=(const std::wstring& str) {
set(str);
return *this;
}
#endif
bool operator==(const path& p) const { return p.m_path == m_path; }
bool operator!=(const path& p) const { return p.m_path != m_path; }
protected:
static std::vector<std::string> tokenize(const std::string& string,
const std::string& delim) {
std::string::size_type lastPos = 0,
pos = string.find_first_of(delim, lastPos);
std::vector<std::string> tokens;
while (lastPos != std::string::npos) {
if (pos != lastPos)
tokens.push_back(string.substr(lastPos, pos - lastPos));
lastPos = pos;
if (lastPos == std::string::npos || lastPos + 1 == string.length()) break;
pos = string.find_first_of(delim, ++lastPos);
}
return tokens;
}
protected:
#if defined(_WIN32)
static const size_t MAX_PATH_WINDOWS = 32767;
#endif
static const size_t MAX_PATH_WINDOWS_LEGACY =
260; // windows平台路径字符串最大长度
path_type m_type; // 特定平台的路径类型，枚举类型，0为windows，1为Linux
std::vector<std::string> m_path; // 按照文件分隔符分隔的字符串向量
bool m_absolute; // 是否为绝对路径
bool m_smb; // Unused, except for on Windows
};
// 创建单个目录
inline bool create_directory(const path& p) {
#if defined(_WIN32)
return CreateDirectoryW(p.wstr().c_str(), NULL) != 0;
#else
return mkdir(p.str().c_str(), S_IRWXU) == 0;
#endif
}
//创建多层目录级别
inline bool create_directories(const path& p) {
#if defined(_WIN32)
return SHCreateDirectory(nullptr, p.make_absolute().wstr().c_str()) ==
ERROR_SUCCESS;
#else
if (create_directory(p.str().c_str())) return true;
if (p.empty()) return false;
if (errno == ENOENT) {
if (create_directory(p.parent_path()))
return mkdir(p.str().c_str(), S_IRWXU) == 0;
else
return false;
}
return false;
#endif
}
// 获取path路径下（包含子路径、子孙路径）所有以wildchard为后缀的全路径图片名字,返回图片数量
inline size_t getFullNames(const path& p,
std::vector<std::string>& saveFileNames,
const char* wildchard = ".jpg") {
bool gIgnoreHidden = true; // 忽略隐藏文件
size_t numsFiles = 0;
saveFileNames.clear();
path fullpath = p.make_absolute();
std::string curr_path = p.str();
// std::stringstream stream;
// stream << fullpath;
// stream >> curr_path;
const char* srcPath = curr_path.c_str();
std::regex reg_obj(wildchard, std::regex::icase);
DIR* dirFile = opendir(srcPath);
if (dirFile) {
struct dirent* hFile;
while ((hFile = readdir(dirFile)) != NULL) {
if (!strcmp(hFile->d_name, ".")) continue;
if (!strcmp(hFile->d_name, "..")) continue;
if (gIgnoreHidden && (hFile->d_name[0] == '.'))
continue; // in linux hidden files all start with '.'
path tmp_path = path(curr_path + "/" + std::string(hFile->d_name));
if (!tmp_path.is_file()) {
std::vector<std::string> tempFileNames;
size_t tempNums = getFullNames(tmp_path, tempFileNames, wildchard);
numsFiles += tempNums;
saveFileNames.insert(saveFileNames.end(), tempFileNames.begin(),
tempFileNames.end());
}
else {
if (std::regex_search(hFile->d_name, reg_obj)) {
std::string full_path = curr_path + "/" + hFile->d_name;
saveFileNames.push_back(full_path);
}
}
}
closedir(dirFile);
}
return saveFileNames.size();
}
/**
* This convenience class looks for a file or directory given its name
* and a set of search paths. The implementation walks through the
* search paths in order and stops once the file is found.
*/
class resolver {
public:
typedef std::vector<path>::iterator iterator;
typedef std::vector<path>::const_iterator const_iterator;
resolver() { m_paths.push_back(path::getcwd()); }
size_t size() const { return m_paths.size(); }
iterator begin() { return m_paths.begin(); }
iterator end() { return m_paths.end(); }
const_iterator begin() const { return m_paths.begin(); }
const_iterator end() const { return m_paths.end(); }
void erase(iterator it) { m_paths.erase(it); }
void prepend(const path& path) { m_paths.insert(m_paths.begin(), path); }
void append(const path& path) { m_paths.push_back(path); }
const path& operator[](size_t index) const { return m_paths[index]; }
path& operator[](size_t index) { return m_paths[index]; }
path resolve(const path& value) const {
for (const_iterator it = m_paths.begin(); it != m_paths.end(); ++it) {
path combined = *it / value;
if (combined.exists()) return combined;
}
return value;
}
friend std::ostream& operator<<(std::ostream& os, const resolver& r) {
os << "resolver[" << std::endl;
for (size_t i = 0; i < r.m_paths.size(); ++i) {
os << " \"" << r.m_paths[i] << "\"";
if (i + 1 < r.m_paths.size()) os << ",";
os << std::endl;
}
os << "]";
return os;
}
private:
std::vector<path> m_paths;
};
} // namespace filesystem