1 files changed, 188 insertions, 0 deletions
diff --git a/src/core/file_sys/disk_archive.cpp b/src/core/file_sys/disk_archive.cpp
new file mode 100644
index 00000000..0197f727
--- /dev/null
+++ b/src/core/file_sys/disk_archive.cpp
@@ -0,0 +1,188 @@
+// Copyright 2014 Citra Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#include <sys/stat.h>
+
+#include "common/common_types.h"
+#include "common/file_util.h"
+
+#include "core/file_sys/disk_archive.h"
+#include "core/settings.h"
+
+////////////////////////////////////////////////////////////////////////////////////////////////////
+// FileSys namespace
+
+namespace FileSys {
+
+std::unique_ptr<FileBackend> DiskArchive::OpenFile(const Path& path, const Mode mode) const {
+    LOG_DEBUG(Service_FS, "called path=%s mode=%01X", path.DebugStr().c_str(), mode.hex);
+    DiskFile* file = new DiskFile(this, path, mode);
+    if (!file->Open())
+        return nullptr;
+    return std::unique_ptr<FileBackend>(file);
+}
+
+bool DiskArchive::DeleteFile(const Path& path) const {
+    return FileUtil::Delete(GetMountPoint() + path.AsString());
+}
+
+bool DiskArchive::RenameFile(const Path& src_path, const Path& dest_path) const {
+    return FileUtil::Rename(GetMountPoint() + src_path.AsString(), GetMountPoint() + dest_path.AsString());
+}
+
+bool DiskArchive::DeleteDirectory(const Path& path) const {
+    return FileUtil::DeleteDir(GetMountPoint() + path.AsString());
+}
+
+ResultCode DiskArchive::CreateFile(const FileSys::Path& path, u32 size) const {
+    std::string full_path = GetMountPoint() + path.AsString();
+
+    if (FileUtil::Exists(full_path))
+        return ResultCode(ErrorDescription::AlreadyExists, ErrorModule::FS, ErrorSummary::NothingHappened, ErrorLevel::Info);
+
+    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;
+
+    return ResultCode(ErrorDescription::TooLarge, ErrorModule::FS, ErrorSummary::OutOfResource, ErrorLevel::Info);
+}
+
+
+bool DiskArchive::CreateDirectory(const Path& path) const {
+    return FileUtil::CreateDir(GetMountPoint() + path.AsString());
+}
+
+bool DiskArchive::RenameDirectory(const Path& src_path, const Path& dest_path) const {
+    return FileUtil::Rename(GetMountPoint() + src_path.AsString(), GetMountPoint() + dest_path.AsString());
+}
+
+std::unique_ptr<DirectoryBackend> DiskArchive::OpenDirectory(const Path& path) const {
+    LOG_DEBUG(Service_FS, "called path=%s", path.DebugStr().c_str());
+    DiskDirectory* directory = new DiskDirectory(this, path);
+    if (!directory->Open())
+        return nullptr;
+    return std::unique_ptr<DirectoryBackend>(directory);
+}
+
+////////////////////////////////////////////////////////////////////////////////////////////////////
+
+DiskFile::DiskFile(const DiskArchive* archive, const Path& path, const Mode mode) {
+    // TODO(Link Mauve): normalize path into an absolute path without "..", it can currently bypass
+    // the root directory we set while opening the archive.
+    // For example, opening /../../etc/passwd can give the emulated program your users list.
+    this->path = archive->GetMountPoint() + path.AsString();
+    this->mode.hex = mode.hex;
+    this->archive = archive;
+}
+
+bool DiskFile::Open() {
+    if (!mode.create_flag && !FileUtil::Exists(path)) {
+        LOG_ERROR(Service_FS, "Non-existing file %s can't be open without mode create.", path.c_str());
+        return false;
+    }
+
+    std::string mode_string;
+    if (mode.create_flag)
+        mode_string = "w+";
+    else if (mode.write_flag)
+        mode_string = "r+"; // Files opened with Write access can be read from
+    else if (mode.read_flag)
+        mode_string = "r";
+
+    // Open the file in binary mode, to avoid problems with CR/LF on Windows systems
+    mode_string += "b";
+
+    file = new FileUtil::IOFile(path, mode_string.c_str());
+    return true;
+}
+
+size_t DiskFile::Read(const u64 offset, const u32 length, u8* buffer) const {
+    file->Seek(offset, SEEK_SET);
+    return file->ReadBytes(buffer, length);
+}
+
+size_t DiskFile::Write(const u64 offset, const u32 length, const u32 flush, const u8* buffer) const {
+    file->Seek(offset, SEEK_SET);
+    size_t written = file->WriteBytes(buffer, length);
+    if (flush)
+        file->Flush();
+    return written;
+}
+
+size_t DiskFile::GetSize() const {
+    return static_cast<size_t>(file->GetSize());
+}
+
+bool DiskFile::SetSize(const u64 size) const {
+    file->Resize(size);
+    file->Flush();
+    return true;
+}
+
+bool DiskFile::Close() const {
+    return file->Close();
+}
+
+////////////////////////////////////////////////////////////////////////////////////////////////////
+
+DiskDirectory::DiskDirectory(const DiskArchive* archive, const Path& path) {
+    // TODO(Link Mauve): normalize path into an absolute path without "..", it can currently bypass
+    // the root directory we set while opening the archive.
+    // For example, opening /../../usr/bin can give the emulated program your installed programs.
+    this->path = archive->GetMountPoint() + path.AsString();
+    this->archive = archive;
+}
+
+bool DiskDirectory::Open() {
+    if (!FileUtil::IsDirectory(path))
+        return false;
+    FileUtil::ScanDirectoryTree(path, directory);
+    children_iterator = directory.children.begin();
+    return true;
+}
+
+u32 DiskDirectory::Read(const u32 count, Entry* entries) {
+    u32 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;
+        }
+
+        FileUtil::SplitFilename83(filename, entry.short_name, entry.extension);
+
+        entry.is_directory = file.isDirectory;
+        entry.is_hidden = (filename[0] == '.');
+        entry.is_read_only = 0;
+        entry.file_size = file.size;
+
+        // We emulate a SD card where the archive bit has never been cleared, as it would be on
+        // most user SD cards.
+        // Some homebrews (blargSNES for instance) are known to mistakenly use the archive bit as a
+        // file bit.
+        entry.is_archive = !file.isDirectory;
+
+        ++entries_read;
+        ++children_iterator;
+    }
+    return entries_read;
+}
+
+} // namespace FileSys