summaryrefslogtreecommitdiffstats
path: root/src/core/file_sys/vfs.cpp
blob: b915b4c11f51037699e07da9f30370533ce21f04 (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
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
// Copyright 2018 yuzu emulator team
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.

#include <algorithm>
#include <numeric>
#include <string>
#include "common/common_paths.h"
#include "common/file_util.h"
#include "common/logging/backend.h"
#include "core/file_sys/mode.h"
#include "core/file_sys/vfs.h"

namespace FileSys {

VfsFilesystem::VfsFilesystem(VirtualDir root_) : root(std::move(root_)) {}

VfsFilesystem::~VfsFilesystem() = default;

std::string VfsFilesystem::GetName() const {
    return root->GetName();
}

bool VfsFilesystem::IsReadable() const {
    return root->IsReadable();
}

bool VfsFilesystem::IsWritable() const {
    return root->IsWritable();
}

VfsEntryType VfsFilesystem::GetEntryType(std::string_view path_) const {
    const auto path = FileUtil::SanitizePath(path_);
    if (root->GetFileRelative(path) != nullptr)
        return VfsEntryType::File;
    if (root->GetDirectoryRelative(path) != nullptr)
        return VfsEntryType::Directory;

    return VfsEntryType::None;
}

VirtualFile VfsFilesystem::OpenFile(std::string_view path_, Mode perms) {
    const auto path = FileUtil::SanitizePath(path_);
    return root->GetFileRelative(path);
}

VirtualFile VfsFilesystem::CreateFile(std::string_view path_, Mode perms) {
    const auto path = FileUtil::SanitizePath(path_);
    return root->CreateFileRelative(path);
}

VirtualFile VfsFilesystem::CopyFile(std::string_view old_path_, std::string_view new_path_) {
    const auto old_path = FileUtil::SanitizePath(old_path_);
    const auto new_path = FileUtil::SanitizePath(new_path_);

    // VfsDirectory impls are only required to implement copy across the current directory.
    if (FileUtil::GetParentPath(old_path) == FileUtil::GetParentPath(new_path)) {
        if (!root->Copy(FileUtil::GetFilename(old_path), FileUtil::GetFilename(new_path)))
            return nullptr;
        return OpenFile(new_path, Mode::ReadWrite);
    }

    // Do it using RawCopy. Non-default impls are encouraged to optimize this.
    const auto old_file = OpenFile(old_path, Mode::Read);
    if (old_file == nullptr)
        return nullptr;
    auto new_file = OpenFile(new_path, Mode::Read);
    if (new_file != nullptr)
        return nullptr;
    new_file = CreateFile(new_path, Mode::Write);
    if (new_file == nullptr)
        return nullptr;
    if (!VfsRawCopy(old_file, new_file))
        return nullptr;
    return new_file;
}

VirtualFile VfsFilesystem::MoveFile(std::string_view old_path, std::string_view new_path) {
    const auto sanitized_old_path = FileUtil::SanitizePath(old_path);
    const auto sanitized_new_path = FileUtil::SanitizePath(new_path);

    // Again, non-default impls are highly encouraged to provide a more optimized version of this.
    auto out = CopyFile(sanitized_old_path, sanitized_new_path);
    if (out == nullptr)
        return nullptr;
    if (DeleteFile(sanitized_old_path))
        return out;
    return nullptr;
}

bool VfsFilesystem::DeleteFile(std::string_view path_) {
    const auto path = FileUtil::SanitizePath(path_);
    auto parent = OpenDirectory(FileUtil::GetParentPath(path), Mode::Write);
    if (parent == nullptr)
        return false;
    return parent->DeleteFile(FileUtil::GetFilename(path));
}

VirtualDir VfsFilesystem::OpenDirectory(std::string_view path_, Mode perms) {
    const auto path = FileUtil::SanitizePath(path_);
    return root->GetDirectoryRelative(path);
}

VirtualDir VfsFilesystem::CreateDirectory(std::string_view path_, Mode perms) {
    const auto path = FileUtil::SanitizePath(path_);
    return root->CreateDirectoryRelative(path);
}

VirtualDir VfsFilesystem::CopyDirectory(std::string_view old_path_, std::string_view new_path_) {
    const auto old_path = FileUtil::SanitizePath(old_path_);
    const auto new_path = FileUtil::SanitizePath(new_path_);

    // Non-default impls are highly encouraged to provide a more optimized version of this.
    auto old_dir = OpenDirectory(old_path, Mode::Read);
    if (old_dir == nullptr)
        return nullptr;
    auto new_dir = OpenDirectory(new_path, Mode::Read);
    if (new_dir != nullptr)
        return nullptr;
    new_dir = CreateDirectory(new_path, Mode::Write);
    if (new_dir == nullptr)
        return nullptr;

    for (const auto& file : old_dir->GetFiles()) {
        const auto x =
            CopyFile(old_path + DIR_SEP + file->GetName(), new_path + DIR_SEP + file->GetName());
        if (x == nullptr)
            return nullptr;
    }

    for (const auto& dir : old_dir->GetSubdirectories()) {
        const auto x =
            CopyDirectory(old_path + DIR_SEP + dir->GetName(), new_path + DIR_SEP + dir->GetName());
        if (x == nullptr)
            return nullptr;
    }

    return new_dir;
}

VirtualDir VfsFilesystem::MoveDirectory(std::string_view old_path, std::string_view new_path) {
    const auto sanitized_old_path = FileUtil::SanitizePath(old_path);
    const auto sanitized_new_path = FileUtil::SanitizePath(new_path);

    // Non-default impls are highly encouraged to provide a more optimized version of this.
    auto out = CopyDirectory(sanitized_old_path, sanitized_new_path);
    if (out == nullptr)
        return nullptr;
    if (DeleteDirectory(sanitized_old_path))
        return out;
    return nullptr;
}

bool VfsFilesystem::DeleteDirectory(std::string_view path_) {
    const auto path = FileUtil::SanitizePath(path_);
    auto parent = OpenDirectory(FileUtil::GetParentPath(path), Mode::Write);
    if (parent == nullptr)
        return false;
    return parent->DeleteSubdirectoryRecursive(FileUtil::GetFilename(path));
}

VfsFile::~VfsFile() = default;

std::string VfsFile::GetExtension() const {
    return std::string(FileUtil::GetExtensionFromFilename(GetName()));
}

VfsDirectory::~VfsDirectory() = default;

boost::optional<u8> VfsFile::ReadByte(size_t offset) const {
    u8 out{};
    size_t size = Read(&out, 1, offset);
    if (size == 1)
        return out;

    return boost::none;
}

std::vector<u8> VfsFile::ReadBytes(size_t size, size_t offset) const {
    std::vector<u8> out(size);
    size_t read_size = Read(out.data(), size, offset);
    out.resize(read_size);
    return out;
}

std::vector<u8> VfsFile::ReadAllBytes() const {
    return ReadBytes(GetSize());
}

bool VfsFile::WriteByte(u8 data, size_t offset) {
    return Write(&data, 1, offset) == 1;
}

size_t VfsFile::WriteBytes(const std::vector<u8>& data, size_t offset) {
    return Write(data.data(), data.size(), offset);
}

std::string VfsFile::GetFullPath() const {
    if (GetContainingDirectory() == nullptr)
        return "/" + GetName();

    return GetContainingDirectory()->GetFullPath() + "/" + GetName();
}

std::shared_ptr<VfsFile> VfsDirectory::GetFileRelative(std::string_view path) const {
    auto vec = FileUtil::SplitPathComponents(path);
    vec.erase(std::remove_if(vec.begin(), vec.end(), [](const auto& str) { return str.empty(); }),
              vec.end());
    if (vec.empty()) {
        return nullptr;
    }

    if (vec.size() == 1) {
        return GetFile(vec[0]);
    }

    auto dir = GetSubdirectory(vec[0]);
    for (size_t component = 1; component < vec.size() - 1; ++component) {
        if (dir == nullptr) {
            return nullptr;
        }

        dir = dir->GetSubdirectory(vec[component]);
    }

    if (dir == nullptr) {
        return nullptr;
    }

    return dir->GetFile(vec.back());
}

std::shared_ptr<VfsFile> VfsDirectory::GetFileAbsolute(std::string_view path) const {
    if (IsRoot()) {
        return GetFileRelative(path);
    }

    return GetParentDirectory()->GetFileAbsolute(path);
}

std::shared_ptr<VfsDirectory> VfsDirectory::GetDirectoryRelative(std::string_view path) const {
    auto vec = FileUtil::SplitPathComponents(path);
    vec.erase(std::remove_if(vec.begin(), vec.end(), [](const auto& str) { return str.empty(); }),
              vec.end());
    if (vec.empty()) {
        // TODO(DarkLordZach): Return this directory if path is '/' or similar. Can't currently
        // because of const-ness
        return nullptr;
    }

    auto dir = GetSubdirectory(vec[0]);
    for (size_t component = 1; component < vec.size(); ++component) {
        if (dir == nullptr) {
            return nullptr;
        }

        dir = dir->GetSubdirectory(vec[component]);
    }

    return dir;
}

std::shared_ptr<VfsDirectory> VfsDirectory::GetDirectoryAbsolute(std::string_view path) const {
    if (IsRoot()) {
        return GetDirectoryRelative(path);
    }

    return GetParentDirectory()->GetDirectoryAbsolute(path);
}

std::shared_ptr<VfsFile> VfsDirectory::GetFile(std::string_view name) const {
    const auto& files = GetFiles();
    const auto iter = std::find_if(files.begin(), files.end(),
                                   [&name](const auto& file1) { return name == file1->GetName(); });
    return iter == files.end() ? nullptr : *iter;
}

std::shared_ptr<VfsDirectory> VfsDirectory::GetSubdirectory(std::string_view name) const {
    const auto& subs = GetSubdirectories();
    const auto iter = std::find_if(subs.begin(), subs.end(),
                                   [&name](const auto& file1) { return name == file1->GetName(); });
    return iter == subs.end() ? nullptr : *iter;
}

bool VfsDirectory::IsRoot() const {
    return GetParentDirectory() == nullptr;
}

size_t VfsDirectory::GetSize() const {
    const auto& files = GetFiles();
    const auto sum_sizes = [](const auto& range) {
        return std::accumulate(range.begin(), range.end(), 0ULL,
                               [](const auto& f1, const auto& f2) { return f1 + f2->GetSize(); });
    };

    const auto file_total = sum_sizes(files);
    const auto& sub_dir = GetSubdirectories();
    const auto subdir_total = sum_sizes(sub_dir);

    return file_total + subdir_total;
}

std::shared_ptr<VfsFile> VfsDirectory::CreateFileRelative(std::string_view path) {
    auto vec = FileUtil::SplitPathComponents(path);
    vec.erase(std::remove_if(vec.begin(), vec.end(), [](const auto& str) { return str.empty(); }),
              vec.end());
    if (vec.empty()) {
        return nullptr;
    }

    if (vec.size() == 1) {
        return CreateFile(vec[0]);
    }

    auto dir = GetSubdirectory(vec[0]);
    if (dir == nullptr) {
        dir = CreateSubdirectory(vec[0]);
        if (dir == nullptr) {
            return nullptr;
        }
    }

    return dir->CreateFileRelative(FileUtil::GetPathWithoutTop(path));
}

std::shared_ptr<VfsFile> VfsDirectory::CreateFileAbsolute(std::string_view path) {
    if (IsRoot()) {
        return CreateFileRelative(path);
    }

    return GetParentDirectory()->CreateFileAbsolute(path);
}

std::shared_ptr<VfsDirectory> VfsDirectory::CreateDirectoryRelative(std::string_view path) {
    auto vec = FileUtil::SplitPathComponents(path);
    vec.erase(std::remove_if(vec.begin(), vec.end(), [](const auto& str) { return str.empty(); }),
              vec.end());
    if (vec.empty()) {
        return nullptr;
    }

    if (vec.size() == 1) {
        return CreateSubdirectory(vec[0]);
    }

    auto dir = GetSubdirectory(vec[0]);
    if (dir == nullptr) {
        dir = CreateSubdirectory(vec[0]);
        if (dir == nullptr) {
            return nullptr;
        }
    }

    return dir->CreateDirectoryRelative(FileUtil::GetPathWithoutTop(path));
}

std::shared_ptr<VfsDirectory> VfsDirectory::CreateDirectoryAbsolute(std::string_view path) {
    if (IsRoot()) {
        return CreateDirectoryRelative(path);
    }

    return GetParentDirectory()->CreateDirectoryAbsolute(path);
}

bool VfsDirectory::DeleteSubdirectoryRecursive(std::string_view name) {
    auto dir = GetSubdirectory(name);
    if (dir == nullptr) {
        return false;
    }

    bool success = true;
    for (const auto& file : dir->GetFiles()) {
        if (!DeleteFile(file->GetName())) {
            success = false;
        }
    }

    for (const auto& sdir : dir->GetSubdirectories()) {
        if (!dir->DeleteSubdirectoryRecursive(sdir->GetName())) {
            success = false;
        }
    }

    return success;
}

bool VfsDirectory::Copy(std::string_view src, std::string_view dest) {
    const auto f1 = GetFile(src);
    auto f2 = CreateFile(dest);
    if (f1 == nullptr || f2 == nullptr) {
        return false;
    }

    if (!f2->Resize(f1->GetSize())) {
        DeleteFile(dest);
        return false;
    }

    return f2->WriteBytes(f1->ReadAllBytes()) == f1->GetSize();
}

std::string VfsDirectory::GetFullPath() const {
    if (IsRoot())
        return GetName();

    return GetParentDirectory()->GetFullPath() + "/" + GetName();
}

bool ReadOnlyVfsDirectory::IsWritable() const {
    return false;
}

bool ReadOnlyVfsDirectory::IsReadable() const {
    return true;
}

std::shared_ptr<VfsDirectory> ReadOnlyVfsDirectory::CreateSubdirectory(std::string_view name) {
    return nullptr;
}

std::shared_ptr<VfsFile> ReadOnlyVfsDirectory::CreateFile(std::string_view name) {
    return nullptr;
}

bool ReadOnlyVfsDirectory::DeleteSubdirectory(std::string_view name) {
    return false;
}

bool ReadOnlyVfsDirectory::DeleteFile(std::string_view name) {
    return false;
}

bool ReadOnlyVfsDirectory::Rename(std::string_view name) {
    return false;
}

bool DeepEquals(const VirtualFile& file1, const VirtualFile& file2, size_t block_size) {
    if (file1->GetSize() != file2->GetSize())
        return false;

    std::vector<u8> f1_v(block_size);
    std::vector<u8> f2_v(block_size);
    for (size_t i = 0; i < file1->GetSize(); i += block_size) {
        auto f1_vs = file1->Read(f1_v.data(), block_size, i);
        auto f2_vs = file2->Read(f2_v.data(), block_size, i);

        if (f1_vs != f2_vs)
            return false;
        auto iters = std::mismatch(f1_v.begin(), f1_v.end(), f2_v.begin(), f2_v.end());
        if (iters.first != f1_v.end() && iters.second != f2_v.end())
            return false;
    }

    return true;
}

bool VfsRawCopy(VirtualFile src, VirtualFile dest) {
    if (src == nullptr || dest == nullptr)
        return false;
    if (!dest->Resize(src->GetSize()))
        return false;
    std::vector<u8> data = src->ReadAllBytes();
    return dest->WriteBytes(data, 0) == data.size();
}
} // namespace FileSys