Added CreateFile to the FS_USER service

Tested with hwtests.

src/core/file_sys/archive_backend.h

@@ -199,6 +199,14 @@ public:
      */
     virtual bool DeleteDirectory(const FileSys::Path& path) const = 0;
 
+    /**
+     * Create a file specified by its path
+     * @param path Path relative to the Archive
+     * @param size The size of the new file, filled with zeroes
+     * @return File creation result code
+     */
+    virtual ResultCode CreateFile(const Path& path, u32 size) const = 0;
+
     /**
      * Create a directory specified by its path
      * @param path Path relative to the archive

src/core/file_sys/archive_romfs.cpp

@@ -58,6 +58,12 @@ bool Archive_RomFS::DeleteDirectory(const FileSys::Path& path) const {
     return false;
 }
 
+ResultCode Archive_RomFS::CreateFile(const Path& path, u32 size) const {
+    LOG_WARNING(Service_FS, "Attempted to create a file in ROMFS.");
+    // TODO: Verify error code
+    return ResultCode(ErrorDescription::NotAuthorized, ErrorModule::FS, ErrorSummary::NotSupported, ErrorLevel::Permanent);
+}
+
 /**
  * Create a directory specified by its path
  * @param path Path relative to the archive

src/core/file_sys/archive_romfs.h

@@ -53,6 +53,14 @@ public:
      */
     bool DeleteDirectory(const FileSys::Path& path) const override;
 
+    /**
+     * Create a file specified by its path
+     * @param path Path relative to the Archive
+     * @param size The size of the new file, filled with zeroes
+     * @return File creation result code
+     */
+    ResultCode CreateFile(const Path& path, u32 size) const override;
+
     /**
      * Create a directory specified by its path
      * @param path Path relative to the archive

src/core/file_sys/disk_archive.cpp

@@ -35,6 +35,27 @@ bool DiskArchive::DeleteDirectory(const FileSys::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());
 }

src/core/file_sys/disk_archive.h

@@ -28,6 +28,7 @@ public:
     bool DeleteFile(const FileSys::Path& path) const override;
     bool RenameFile(const FileSys::Path& src_path, const FileSys::Path& dest_path) const override;
     bool DeleteDirectory(const FileSys::Path& path) const override;
+    ResultCode CreateFile(const Path& path, u32 size) const override;
     bool CreateDirectory(const Path& path) const override;
     bool RenameDirectory(const FileSys::Path& src_path, const FileSys::Path& dest_path) const override;
     std::unique_ptr<DirectoryBackend> OpenDirectory(const Path& path) const override;