summaryrefslogtreecommitdiffstats
path: root/src/common/file_util.h
blob: ff01bf0ff7d61cedbebc5de23aa8517e7c18e8af (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
// Copyright 2013 Dolphin Emulator Project / 2014 Citra Emulator Project
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.

#pragma once

#include <array>
#include <cstdio>
#include <fstream>
#include <functional>
#include <string>
#include <type_traits>
#include <vector>
#include "common/common_types.h"
#ifdef _MSC_VER
#include "common/string_util.h"
#endif

namespace FileUtil {

// User paths for GetUserPath
enum class UserPath {
    CacheDir,
    ConfigDir,
    LogDir,
    NANDDir,
    RootDir,
    SDMCDir,
    SysDataDir,
    UserDir,
};

// FileSystem tree node/
struct FSTEntry {
    bool isDirectory;
    u64 size;                 // file length or number of entries from children
    std::string physicalName; // name on disk
    std::string virtualName;  // name in FST names table
    std::vector<FSTEntry> children;
};

// Returns true if file filename exists
bool Exists(const std::string& filename);

// Returns true if filename is a directory
bool IsDirectory(const std::string& filename);

// Returns the size of filename (64bit)
u64 GetSize(const std::string& filename);

// Overloaded GetSize, accepts file descriptor
u64 GetSize(const int fd);

// Overloaded GetSize, accepts FILE*
u64 GetSize(FILE* f);

// Returns true if successful, or path already exists.
bool CreateDir(const std::string& filename);

// Creates the full path of fullPath returns true on success
bool CreateFullPath(const std::string& fullPath);

// Deletes a given filename, return true on success
// Doesn't supports deleting a directory
bool Delete(const std::string& filename);

// Deletes a directory filename, returns true on success
bool DeleteDir(const std::string& filename);

// renames file srcFilename to destFilename, returns true on success
bool Rename(const std::string& srcFilename, const std::string& destFilename);

// copies file srcFilename to destFilename, returns true on success
bool Copy(const std::string& srcFilename, const std::string& destFilename);

// creates an empty file filename, returns true on success
bool CreateEmptyFile(const std::string& filename);

/**
 * @param num_entries_out to be assigned by the callable with the number of iterated directory
 * entries, never null
 * @param directory the path to the enclosing directory
 * @param virtual_name the entry name, without any preceding directory info
 * @return whether handling the entry succeeded
 */
using DirectoryEntryCallable = std::function<bool(
    unsigned* num_entries_out, const std::string& directory, const std::string& virtual_name)>;

/**
 * Scans a directory, calling the callback for each file/directory contained within.
 * If the callback returns failure, scanning halts and this function returns failure as well
 * @param num_entries_out assigned by the function with the number of iterated directory entries,
 * can be null
 * @param directory the directory to scan
 * @param callback The callback which will be called for each entry
 * @return whether scanning the directory succeeded
 */
bool ForeachDirectoryEntry(unsigned* num_entries_out, const std::string& directory,
                           DirectoryEntryCallable callback);

/**
 * Scans the directory tree, storing the results.
 * @param directory the parent directory to start scanning from
 * @param parent_entry FSTEntry where the filesystem tree results will be stored.
 * @param recursion Number of children directories to read before giving up.
 * @return the total number of files/directories found
 */
unsigned ScanDirectoryTree(const std::string& directory, FSTEntry& parent_entry,
                           unsigned int recursion = 0);

// deletes the given directory and anything under it. Returns true on success.
bool DeleteDirRecursively(const std::string& directory, unsigned int recursion = 256);

// Returns the current directory
std::string GetCurrentDir();

// Create directory and copy contents (does not overwrite existing files)
void CopyDir(const std::string& source_path, const std::string& dest_path);

// Set the current directory to given directory
bool SetCurrentDir(const std::string& directory);

// Returns a pointer to a string with a yuzu data dir in the user's home
// directory. To be used in "multi-user" mode (that is, installed).
const std::string& GetUserPath(UserPath path, const std::string& new_path = "");

// Returns the path to where the sys file are
std::string GetSysDirectory();

#ifdef __APPLE__
std::string GetBundleDirectory();
#endif

#ifdef _WIN32
const std::string& GetExeDirectory();
std::string AppDataRoamingDirectory();
#endif

size_t WriteStringToFile(bool text_file, const std::string& str, const char* filename);
size_t ReadFileToString(bool text_file, const char* filename, std::string& str);

/**
 * Splits the filename into 8.3 format
 * Loosely implemented following https://en.wikipedia.org/wiki/8.3_filename
 * @param filename The normal filename to use
 * @param short_name A 9-char array in which the short name will be written
 * @param extension A 4-char array in which the extension will be written
 */
void SplitFilename83(const std::string& filename, std::array<char, 9>& short_name,
                     std::array<char, 4>& extension);

// Splits the path on '/' or '\' and put the components into a vector
// i.e. "C:\Users\Yuzu\Documents\save.bin" becomes {"C:", "Users", "Yuzu", "Documents", "save.bin" }
std::vector<std::string> SplitPathComponents(const std::string& filename);

// Gets all of the text up to the last '/' or '\' in the path.
std::string GetParentPath(const std::string& path);

// Gets all of the text after the first '/' or '\' in the path.
std::string GetPathWithoutTop(std::string path);

// Gets the filename of the path
std::string GetFilename(std::string path);

// Gets the extension of the filename
std::string GetExtensionFromFilename(const std::string& name);

// Removes the final '/' or '\' if one exists
std::string RemoveTrailingSlash(const std::string& path);

// Creates a new vector containing indices [first, last) from the original.
template <typename T>
std::vector<T> SliceVector(const std::vector<T>& vector, size_t first, size_t last) {
    if (first >= last)
        return {};
    last = std::min<size_t>(last, vector.size());
    return std::vector<T>(vector.begin() + first, vector.begin() + first + last);
}

// simple wrapper for cstdlib file functions to
// hopefully will make error checking easier
// and make forgetting an fclose() harder
class IOFile : public NonCopyable {
public:
    IOFile();
    // flags is used for windows specific file open mode flags, which
    // allows yuzu to open the logs in shared write mode, so that the file
    // isn't considered "locked" while yuzu is open and people can open the log file and view it
    IOFile(const std::string& filename, const char openmode[], int flags = 0);

    ~IOFile();

    IOFile(IOFile&& other) noexcept;
    IOFile& operator=(IOFile&& other) noexcept;

    void Swap(IOFile& other) noexcept;

    bool Open(const std::string& filename, const char openmode[], int flags = 0);
    bool Close();

    template <typename T>
    size_t ReadArray(T* data, size_t length) const {
        static_assert(std::is_trivially_copyable<T>(),
                      "Given array does not consist of trivially copyable objects");

        if (!IsOpen())
            return -1;

        return std::fread(data, sizeof(T), length, m_file);
    }

    template <typename T>
    size_t WriteArray(const T* data, size_t length) {
        static_assert(std::is_trivially_copyable<T>(),
                      "Given array does not consist of trivially copyable objects");
        if (!IsOpen())
            return -1;
        return std::fwrite(data, sizeof(T), length, m_file);
    }

    template <typename T>
    size_t ReadBytes(T* data, size_t length) const {
        static_assert(std::is_trivially_copyable<T>(), "T must be trivially copyable");
        return ReadArray(reinterpret_cast<char*>(data), length);
    }

    template <typename T>
    size_t WriteBytes(const T* data, size_t length) {
        static_assert(std::is_trivially_copyable<T>(), "T must be trivially copyable");
        return WriteArray(reinterpret_cast<const char*>(data), length);
    }

    template <typename T>
    size_t WriteObject(const T& object) {
        static_assert(!std::is_pointer<T>::value, "Given object is a pointer");
        return WriteArray(&object, 1);
    }

    size_t WriteString(const std::string& str) {
        return WriteArray(str.c_str(), str.length());
    }

    bool IsOpen() const {
        return nullptr != m_file;
    }

    bool Seek(s64 off, int origin) const;
    u64 Tell() const;
    u64 GetSize() const;
    bool Resize(u64 size);
    bool Flush();

    // clear error state
    void Clear() {
        std::clearerr(m_file);
    }

private:
    std::FILE* m_file = nullptr;
};

} // namespace FileUtil

// To deal with Windows being dumb at unicode:
template <typename T>
void OpenFStream(T& fstream, const std::string& filename, std::ios_base::openmode openmode) {
#ifdef _MSC_VER
    fstream.open(Common::UTF8ToTStr(filename).c_str(), openmode);
#else
    fstream.open(filename.c_str(), openmode);
#endif
}