summaryrefslogtreecommitdiffstats
path: root/src/core/file_sys/disk_filesystem.cpp
blob: 3a4b45721db3105a526e8ddd68153648059d784d (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
// Copyright 2018 yuzu emulator team
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.

#include <cstring>
#include <memory>
#include "common/common_types.h"
#include "common/logging/log.h"
#include "core/file_sys/disk_filesystem.h"
#include "core/file_sys/errors.h"

namespace FileSys {

static std::string ModeFlagsToString(Mode mode) {
    std::string mode_str;
    u32 mode_flags = static_cast<u32>(mode);

    // Calculate the correct open mode for the file.
    if ((mode_flags & static_cast<u32>(Mode::Read)) &&
        (mode_flags & static_cast<u32>(Mode::Write))) {
        if (mode_flags & static_cast<u32>(Mode::Append))
            mode_str = "a+";
        else
            mode_str = "r+";
    } else {
        if (mode_flags & static_cast<u32>(Mode::Read))
            mode_str = "r";
        else if (mode_flags & static_cast<u32>(Mode::Append))
            mode_str = "a";
        else if (mode_flags & static_cast<u32>(Mode::Write))
            mode_str = "w";
    }

    mode_str += "b";

    return mode_str;
}

std::string Disk_FileSystem::GetName() const {
    return "Disk";
}

ResultVal<std::unique_ptr<StorageBackend>> Disk_FileSystem::OpenFile(const std::string& path,
                                                                     Mode mode) const {

    // Calculate the correct open mode for the file.
    std::string mode_str = ModeFlagsToString(mode);

    std::string full_path = base_directory + path;
    auto file = std::make_shared<FileUtil::IOFile>(full_path, mode_str.c_str());

    if (!file->IsOpen()) {
        return ERROR_PATH_NOT_FOUND;
    }

    return MakeResult<std::unique_ptr<StorageBackend>>(
        std::make_unique<Disk_Storage>(std::move(file)));
}

ResultCode Disk_FileSystem::DeleteFile(const Path& path) const {
    LOG_WARNING(Service_FS, "(STUBBED) called");
    // TODO(bunnei): Use correct error code
    return ResultCode(-1);
}

ResultCode Disk_FileSystem::RenameFile(const Path& src_path, const Path& dest_path) const {
    LOG_WARNING(Service_FS, "(STUBBED) called");
    // TODO(wwylele): Use correct error code
    return ResultCode(-1);
}

ResultCode Disk_FileSystem::DeleteDirectory(const Path& path) const {
    LOG_WARNING(Service_FS, "(STUBBED) called");
    // TODO(wwylele): Use correct error code
    return ResultCode(-1);
}

ResultCode Disk_FileSystem::DeleteDirectoryRecursively(const Path& path) const {
    LOG_WARNING(Service_FS, "(STUBBED) called");
    // TODO(wwylele): Use correct error code
    return ResultCode(-1);
}

ResultCode Disk_FileSystem::CreateFile(const std::string& path, u64 size) const {
    LOG_WARNING(Service_FS, "(STUBBED) called");

    std::string full_path = base_directory + path;
    if (size == 0) {
        FileUtil::CreateEmptyFile(full_path);
        return RESULT_SUCCESS;
    }

    FileUtil::IOFile file(full_path, "wb");
    // Creates a sparse file (or a normal file on filesystems without the concept of sparse files)
    // We do this by seeking to the right size, then writing a single null byte.
    if (file.Seek(size - 1, SEEK_SET) && file.WriteBytes("", 1) == 1) {
        return RESULT_SUCCESS;
    }

    LOG_ERROR(Service_FS, "Too large file");
    // TODO(Subv): Find out the correct error code
    return ResultCode(-1);
}

ResultCode Disk_FileSystem::CreateDirectory(const std::string& path) const {
    // TODO(Subv): Perform path validation to prevent escaping the emulator sandbox.
    std::string full_path = base_directory + path;

    if (FileUtil::CreateDir(full_path)) {
        return RESULT_SUCCESS;
    }

    LOG_CRITICAL(Service_FS, "(unreachable) Unknown error creating %s", full_path.c_str());
    // TODO(wwylele): Use correct error code
    return ResultCode(-1);
}

ResultCode Disk_FileSystem::RenameDirectory(const Path& src_path, const Path& dest_path) const {
    LOG_WARNING(Service_FS, "(STUBBED) called");
    // TODO(wwylele): Use correct error code
    return ResultCode(-1);
}

ResultVal<std::unique_ptr<DirectoryBackend>> Disk_FileSystem::OpenDirectory(
    const std::string& path) const {

    std::string full_path = base_directory + path;

    if (!FileUtil::IsDirectory(full_path)) {
        // TODO(Subv): Find the correct error code for this.
        return ResultCode(-1);
    }

    auto directory = std::make_unique<Disk_Directory>(full_path);
    return MakeResult<std::unique_ptr<DirectoryBackend>>(std::move(directory));
}

u64 Disk_FileSystem::GetFreeSpaceSize() const {
    LOG_WARNING(Service_FS, "(STUBBED) called");
    return 0;
}

ResultVal<FileSys::EntryType> Disk_FileSystem::GetEntryType(const std::string& path) const {
    std::string full_path = base_directory + path;
    if (!FileUtil::Exists(full_path)) {
        return ERROR_PATH_NOT_FOUND;
    }

    if (FileUtil::IsDirectory(full_path))
        return MakeResult(EntryType::Directory);

    return MakeResult(EntryType::File);
}

ResultVal<size_t> Disk_Storage::Read(const u64 offset, const size_t length, u8* buffer) const {
    LOG_TRACE(Service_FS, "called offset=%llu, length=%zu", offset, length);
    file->Seek(offset, SEEK_SET);
    return MakeResult<size_t>(file->ReadBytes(buffer, length));
}

ResultVal<size_t> Disk_Storage::Write(const u64 offset, const size_t length, const bool flush,
                                      const u8* buffer) const {
    LOG_WARNING(Service_FS, "(STUBBED) called");
    file->Seek(offset, SEEK_SET);
    size_t written = file->WriteBytes(buffer, length);
    if (flush) {
        file->Flush();
    }
    return MakeResult<size_t>(written);
}

u64 Disk_Storage::GetSize() const {
    return file->GetSize();
}

bool Disk_Storage::SetSize(const u64 size) const {
    LOG_WARNING(Service_FS, "(STUBBED) called");
    return false;
}

Disk_Directory::Disk_Directory(const std::string& path) : directory() {
    unsigned size = FileUtil::ScanDirectoryTree(path, directory);
    directory.size = size;
    directory.isDirectory = true;
    children_iterator = directory.children.begin();
}

u64 Disk_Directory::Read(const u64 count, Entry* entries) {
    u64 entries_read = 0;

    while (entries_read < count && children_iterator != directory.children.cend()) {
        const FileUtil::FSTEntry& file = *children_iterator;
        const std::string& filename = file.virtualName;
        Entry& entry = entries[entries_read];

        LOG_TRACE(Service_FS, "File %s: size=%llu dir=%d", filename.c_str(), file.size,
                  file.isDirectory);

        // TODO(Link Mauve): use a proper conversion to UTF-16.
        for (size_t j = 0; j < FILENAME_LENGTH; ++j) {
            entry.filename[j] = filename[j];
            if (!filename[j])
                break;
        }

        if (file.isDirectory) {
            entry.file_size = 0;
            entry.type = EntryType::Directory;
        } else {
            entry.file_size = file.size;
            entry.type = EntryType::File;
        }

        ++entries_read;
        ++children_iterator;
    }
    return entries_read;
}

u64 Disk_Directory::GetEntryCount() const {
    // We convert the children iterator into a const_iterator to allow template argument deduction
    // in std::distance.
    std::vector<FileUtil::FSTEntry>::const_iterator current = children_iterator;
    return std::distance(current, directory.children.end());
}

} // namespace FileSys