module FileStorage
	def self.message_buffer_size
	def self.file_reading_buffer_size
	def self.data_digest(data : Bytes)
	def self.file_digest(file : File)
end

class FileStorage::Chunk
	n      : Int32   # chunk's number
	on     : Int32   # number of chunks
	digest : String  # digest of the current chunk

	initialize(@n, @on, data)
end

class FileStorage::FileInfo
	name      : String
	size      : UInt64
	nb_chunks : Int32
	digest    : String
	tags      : Array(String)

	initialize(file : File, tags = nil)
end

class TransferInfo
	owner : Int32
	file_info : FileStorage::FileInfo
	chunks : Array(Int32)

	initialize(@owner, @file_info)
end

# Keep track of connected users and their requests.
class FileStorage::UserData
	property uid       : Int32
	property uploads   : Array(Upload)   # NOT USED.
	property downloads : Array(Download) # NOT USED.

	initialize(@uid, @uploads = Array(Upload).new,
		@downloads = Array(Download).new)
end

root/
	files/ : actual files
	meta/  : DODB TransferInfo
	users/ : DODP UserData (for later use: quotas, rights)