note
	description: "Serialize/Deserialize data from a medium."
	legal: "See notice at end of class."
	status: "See notice at end of class."
	date: "$Date: 2017-09-25 15:53:33 +0000 (Mon, 25 Sep 2017) $"
	revision: "$Revision: 100789 $"

class 
	SED_MEDIUM_READER_WRITER

create 
	make,
	make_for_reading,
	make_for_writing,
	make_with_buffer

feature {NONE} -- Initialization

	default_create
			-- Process instances of classes with no creation clause.
			-- (Default: do nothing.)
			-- (from ANY)
		do
		end

	make (a_medium: IO_MEDIUM)
			-- Initialize current to read or write from a_medium.
		require
			a_medium_not_void: a_medium /= Void
			a_medium_support_storable: a_medium.support_storable
		do
			make_with_buffer (a_medium, Default_buffer_size)
		ensure
			medium_set: medium = a_medium
			buffer_size_set: buffer_size = Default_buffer_size
		end

	make_for_reading (a_medium: IO_MEDIUM)
			-- Initialize current to read from a_medium.
		require
			a_medium_not_void: a_medium /= Void
			a_medium_open_for_reading: a_medium.is_open_read
			a_medium_support_storable: a_medium.support_storable
		do
			make (a_medium)
			set_for_reading
		ensure
			medium_set: medium = a_medium
			buffer_size_set: buffer_size = Default_buffer_size
		end

	make_for_writing (a_medium: IO_MEDIUM)
			-- Initialize current to write to a_medium.
		require
			a_medium_not_void: a_medium /= Void
			a_medium_open_for_writing: a_medium.is_open_write
			a_medium_support_storable: a_medium.support_storable
		do
			make (a_medium)
			set_for_writing
		ensure
			medium_set: medium = a_medium
			buffer_size_set: buffer_size = Default_buffer_size
		end

	make_with_buffer (a_medium: IO_MEDIUM; a_buffer_size: INTEGER_32)
			-- Initialize current to read or write from a_medium using a buffer of size a_buffer_size.
			-- buffer_size will be overriden during read operation by the value of buffer_size used
			-- when writing.
		require
			a_medium_not_void: a_medium /= Void
			a_buffer_size_non_negative: a_buffer_size >= 0
			a_medium_support_storable: a_medium.support_storable
		do
			medium := a_medium
			buffer_size := a_buffer_size
			create buffer.make (a_buffer_size)
		ensure
			medium_set: medium = a_medium
			buffer_size_set: buffer_size = a_buffer_size
			buffer_size_set: buffer.count = a_buffer_size
		end
	
feature -- Access

	generating_type: TYPE [detachable SED_MEDIUM_READER_WRITER]
			-- Type of current object
			-- (type of which it is a direct instance)
			-- (from ANY)
		external
			"built_in"
		ensure -- from ANY
			generating_type_not_void: Result /= Void
		end

	generator: STRING_8
			-- Name of current object's generating class
			-- (base class of the type of which it is a direct instance)
			-- (from ANY)
		external
			"built_in"
		ensure -- from ANY
			generator_not_void: Result /= Void
			generator_not_empty: not Result.is_empty
		end

	read_boolean: BOOLEAN
			-- Read next boolean
			-- (from SED_READER_WRITER)
		require -- from SED_READER_WRITER
			is_ready: is_ready_for_reading
		do
			Result := read_natural_8 = 1
		end

	read_character_32: CHARACTER_32
			-- Read next 32-bits character
			-- (from SED_READER_WRITER)
		require -- from SED_READER_WRITER
			is_ready: is_ready_for_reading
		do
			Result := read_natural_32.to_character_32
		end

	read_character_8: CHARACTER_8
			-- Read next 8-bits character
			-- (from SED_READER_WRITER)
		require -- from SED_READER_WRITER
			is_ready: is_ready_for_reading
		do
			Result := read_natural_8.to_character_8
		end

	read_compressed_integer_32: INTEGER_32
			-- Read next compressed integer_32.
			-- See read_compressed_natural_32 for more details about encoding.
			-- (from SED_READER_WRITER)
		require -- from SED_READER_WRITER
			is_ready: is_ready_for_reading
		do
			Result := read_compressed_natural_32.as_integer_32
		end

	read_compressed_natural_32: NATURAL_32
			-- Read next compressed natural_32.
			-- Depending on first natural_8 value read, it will tell how much more we need to read:
			-- 1 - Of the form 0xxxxxxx (0x00) for values between 0 and 127
			-- 2 - Of the form 10xxxxxx (0x80) for values between 128 and 16382 and one more to read.
			-- 3 - Of the form 110xxxxx (0xC0) for values between 16383 and 2097150 and 2 more to read.
			-- 4 - Of the form 1110xxxx (0xE0) for values between 2097151 and 268435454 and 3 more to read
			-- 5 - Otherwise a full natural_32 to read.
			-- (from SED_READER_WRITER)
		require -- from SED_READER_WRITER
			is_ready: is_ready_for_reading
		local
			l_nat8: NATURAL_8
		do
			l_nat8 := read_natural_8
			if l_nat8 & 128 = 0 then
				Result := l_nat8.to_natural_32
			elseif l_nat8 & 192 = 128 then
				Result := ((l_nat8.as_natural_32 & 63) |<< 8) | read_natural_8.as_natural_32
			elseif l_nat8 & 224 = 192 then
				Result := ((l_nat8.as_natural_32 & 31) |<< 16) | (read_natural_8.as_natural_32 |<< 8) | read_natural_8.as_natural_32
			elseif l_nat8 & 240 = 224 then
				Result := ((l_nat8.as_natural_32 & 15) |<< 24) | (read_natural_8.as_natural_32 |<< 16) | (read_natural_8.as_natural_32 |<< 8) | read_natural_8.as_natural_32
			else
				Result := read_natural_32
			end
		end

	read_immutable_string_32: IMMUTABLE_STRING_32
			-- Read next sequence of characters encoded in UTF-8 as an IMMUTABLE_STRING_32.
			-- (from SED_READER_WRITER)
		require -- from SED_READER_WRITER
			is_ready: is_ready_for_reading
		do
			create Result.make_from_string (read_string_32)
		ensure -- from SED_READER_WRITER
			read_string_8_not_void: Result /= Void
		end

	read_immutable_string_8: IMMUTABLE_STRING_8
			-- Read next 8-bits sequence of character as an IMMUTABLE_STRING_8
			-- (from SED_READER_WRITER)
		require -- from SED_READER_WRITER
			is_ready: is_ready_for_reading
		do
			create Result.make_from_string (read_string_8)
		ensure -- from SED_READER_WRITER
			read_immutable_string_8_not_void: Result /= Void
		end

	read_integer_16: INTEGER_16
			-- Read next integer_16
			-- (from SED_BINARY_READER_WRITER)
		require -- from SED_READER_WRITER
			is_ready: is_ready_for_reading
		do
			check
				correct_size: {PLATFORM}.natural_16_bytes = {PLATFORM}.integer_16_bytes
			end
			Result := read_natural_16.as_integer_16
		end

	read_integer_32: INTEGER_32
			-- Read next integer_32
			-- (from SED_BINARY_READER_WRITER)
		require -- from SED_READER_WRITER
			is_ready: is_ready_for_reading
		do
			check
				correct_size: {PLATFORM}.natural_32_bytes = {PLATFORM}.integer_32_bytes
			end
			Result := read_natural_32.as_integer_32
		end

	read_integer_64: INTEGER_64
			-- Read next integer_64
			-- (from SED_BINARY_READER_WRITER)
		require -- from SED_READER_WRITER
			is_ready: is_ready_for_reading
		do
			check
				correct_size: {PLATFORM}.natural_64_bytes = {PLATFORM}.integer_64_bytes
			end
			Result := read_natural_64.as_integer_64
		end

	read_integer_8: INTEGER_8
			-- Read next integer_8
			-- (from SED_BINARY_READER_WRITER)
		require -- from SED_READER_WRITER
			is_ready: is_ready_for_reading
		do
			check
				correct_size: {PLATFORM}.natural_8_bytes = {PLATFORM}.integer_8_bytes
			end
			Result := read_natural_8.as_integer_8
		end

	read_natural_16: NATURAL_16
			-- Read next natural_16
			-- (from SED_BINARY_READER_WRITER)
		require -- from SED_READER_WRITER
			is_ready: is_ready_for_reading
		local
			l_pos: INTEGER_32
		do
			check_buffer ({PLATFORM}.natural_16_bytes)
			l_pos := buffer_position
			if is_little_endian_storable then
				Result := buffer.read_natural_16_le (l_pos)
			else
				Result := buffer.read_natural_16_be (l_pos)
			end
			l_pos := l_pos + {PLATFORM}.natural_16_bytes
			buffer_position := l_pos
		end

	read_natural_32: NATURAL_32
			-- Read next natural_32
			-- (from SED_BINARY_READER_WRITER)
		require -- from SED_READER_WRITER
			is_ready: is_ready_for_reading
		local
			l_pos: INTEGER_32
		do
			check_buffer ({PLATFORM}.natural_32_bytes)
			l_pos := buffer_position
			if is_little_endian_storable then
				Result := buffer.read_natural_32_le (l_pos)
			else
				Result := buffer.read_natural_32_be (l_pos)
			end
			l_pos := l_pos + {PLATFORM}.natural_32_bytes
			buffer_position := l_pos
		end

	read_natural_64: NATURAL_64
			-- Read next natural_64
			-- (from SED_BINARY_READER_WRITER)
		require -- from SED_READER_WRITER
			is_ready: is_ready_for_reading
		local
			l_pos: INTEGER_32
		do
			check_buffer ({PLATFORM}.natural_64_bytes)
			l_pos := buffer_position
			if is_little_endian_storable then
				Result := buffer.read_natural_64_le (l_pos)
			else
				Result := buffer.read_natural_64_be (l_pos)
			end
			l_pos := l_pos + {PLATFORM}.natural_64_bytes
			buffer_position := l_pos
		end

	read_natural_8: NATURAL_8
			-- Read next natural_8
			-- (from SED_BINARY_READER_WRITER)
		require -- from SED_READER_WRITER
			is_ready: is_ready_for_reading
		local
			l_pos: INTEGER_32
		do
			check_buffer ({PLATFORM}.natural_8_bytes)
			l_pos := buffer_position
			Result := buffer.read_natural_8 (l_pos)
			l_pos := l_pos + {PLATFORM}.natural_8_bytes
			buffer_position := l_pos
		end

	read_pointer: POINTER
			-- Read next pointer
			-- (from SED_BINARY_READER_WRITER)
		require -- from SED_READER_WRITER
			is_ready: is_ready_for_reading
		local
			l_val32: NATURAL_32
			l_val64: NATURAL_64
		do
			if is_pointer_value_stored then
				check_buffer (stored_pointer_bytes)
				if {PLATFORM}.pointer_bytes = stored_pointer_bytes then
					if {PLATFORM}.pointer_bytes = {PLATFORM}.natural_32_bytes then
						l_val32 := read_natural_32;
						($Result).memory_copy ($l_val32.to_pointer, {PLATFORM}.natural_32_bytes)
					elseif {PLATFORM}.pointer_bytes = {PLATFORM}.natural_64_bytes then
						l_val64 := read_natural_64;
						($Result).memory_copy ($l_val64.to_pointer, {PLATFORM}.natural_64_bytes)
					else
						check
							not_supported: False
						end
					end
				elseif {PLATFORM}.pointer_bytes > stored_pointer_bytes then
					check
						expected_size: {PLATFORM}.pointer_bytes = {PLATFORM}.natural_64_bytes and stored_pointer_bytes = {PLATFORM}.natural_32_bytes
					end
					l_val32 := read_natural_32;
					($Result + {PLATFORM}.natural_32_bytes).memory_copy ($l_val32.to_pointer, {PLATFORM}.natural_32_bytes)
				else
					check
						expected_size: {PLATFORM}.pointer_bytes = {PLATFORM}.natural_32_bytes and stored_pointer_bytes = {PLATFORM}.natural_64_bytes
					end
					l_val32 := read_natural_64.as_natural_32;
					($Result).memory_copy ($l_val32.to_pointer, {PLATFORM}.natural_32_bytes)
				end
			end
		end

	read_real_32: REAL_32
			-- Read next real_32
			-- (from SED_BINARY_READER_WRITER)
		require -- from SED_READER_WRITER
			is_ready: is_ready_for_reading
		local
			l_pos: INTEGER_32
		do
			check_buffer ({PLATFORM}.real_32_bytes)
			l_pos := buffer_position
			if is_little_endian_storable then
				Result := buffer.read_real_32_le (l_pos)
			else
				Result := buffer.read_real_32_be (l_pos)
			end
			l_pos := l_pos + {PLATFORM}.real_32_bytes
			buffer_position := l_pos
		end

	read_real_64: REAL_64
			-- Read next real_64
			-- (from SED_BINARY_READER_WRITER)
		require -- from SED_READER_WRITER
			is_ready: is_ready_for_reading
		local
			l_pos: INTEGER_32
		do
			check_buffer ({PLATFORM}.real_64_bytes)
			l_pos := buffer_position
			if is_little_endian_storable then
				Result := buffer.read_real_64_le (l_pos)
			else
				Result := buffer.read_real_64_be (l_pos)
			end
			l_pos := l_pos + {PLATFORM}.real_64_bytes
			buffer_position := l_pos
		end

	read_string_32: STRING_32
			-- Read next sequence of characters encoded in UTF-8.
			-- (from SED_READER_WRITER)
		require -- from SED_READER_WRITER
			is_ready: is_ready_for_reading
		local
			u: UTF_CONVERTER
		do
			Result := u.utf_8_string_8_to_string_32 (read_string_8)
		ensure -- from SED_READER_WRITER
			read_string_8_not_void: Result /= Void
		end

	read_string_8: STRING_8
			-- Read next 8-bits sequence of character
			-- (from SED_READER_WRITER)
		require -- from SED_READER_WRITER
			is_ready: is_ready_for_reading
		local
			i, nb: INTEGER_32
		do
			nb := read_compressed_natural_32.to_integer_32
			create Result.make (nb)
			from
				i := 1
				nb := nb + 1
			until
				i = nb
			loop
				Result.append_character (read_character_8)
				i := i + 1
			end
		ensure -- from SED_READER_WRITER
			read_string_8_not_void: Result /= Void
		end

	Reader_writer_version_6_6: NATURAL_32 = 1
			-- Version of format used for reading/writing.
	
feature -- Comparison

	frozen deep_equal (a: detachable ANY; b: like arg #1): BOOLEAN
			-- Are a and b either both void
			-- or attached to isomorphic object structures?
			-- (from ANY)
		do
			if a = Void then
				Result := b = Void
			else
				Result := b /= Void and then a.is_deep_equal (b)
			end
		ensure -- from ANY
			instance_free: class
			shallow_implies_deep: standard_equal (a, b) implies Result
			both_or_none_void: (a = Void) implies (Result = (b = Void))
			same_type: (Result and (a /= Void)) implies (b /= Void and then a.same_type (b))
			symmetric: Result implies deep_equal (b, a)
		end

	frozen equal (a: detachable ANY; b: like arg #1): BOOLEAN
			-- Are a and b either both void or attached
			-- to objects considered equal?
			-- (from ANY)
		do
			if a = Void then
				Result := b = Void
			else
				Result := b /= Void and then a.is_equal (b)
			end
		ensure -- from ANY
			instance_free: class
			definition: Result = (a = Void and b = Void) or else ((a /= Void and b /= Void) and then a.is_equal (b))
		end

	frozen is_deep_equal alias "≡≡≡" (other: SED_MEDIUM_READER_WRITER): BOOLEAN
			-- Are Current and other attached to isomorphic object structures?
			-- (from ANY)
		require -- from ANY
			other_not_void: other /= Void
		external
			"built_in"
		ensure -- from ANY
			shallow_implies_deep: standard_is_equal (other) implies Result
			same_type: Result implies same_type (other)
			symmetric: Result implies other.is_deep_equal (Current)
		end

	is_equal (other: SED_MEDIUM_READER_WRITER): BOOLEAN
			-- Is other attached to an object considered
			-- equal to current object?
			-- (from ANY)
		require -- from ANY
			other_not_void: other /= Void
		external
			"built_in"
		ensure -- from ANY
			symmetric: Result implies other ~ Current
			consistent: standard_is_equal (other) implies Result
		end

	frozen standard_equal (a: detachable ANY; b: like arg #1): BOOLEAN
			-- Are a and b either both void or attached to
			-- field-by-field identical objects of the same type?
			-- Always uses default object comparison criterion.
			-- (from ANY)
		do
			if a = Void then
				Result := b = Void
			else
				Result := b /= Void and then a.standard_is_equal (b)
			end
		ensure -- from ANY
			instance_free: class
			definition: Result = (a = Void and b = Void) or else ((a /= Void and b /= Void) and then a.standard_is_equal (b))
		end

	frozen standard_is_equal alias "≜" (other: SED_MEDIUM_READER_WRITER): BOOLEAN
			-- Is other attached to an object of the same type
			-- as current object, and field-by-field identical to it?
			-- (from ANY)
		require -- from ANY
			other_not_void: other /= Void
		external
			"built_in"
		ensure -- from ANY
			same_type: Result implies same_type (other)
			symmetric: Result implies other.standard_is_equal (Current)
		end
	
feature -- Status report

	cleanup
			-- When a reading is stopped, perform the necessary cleanup to perform
			-- another reading or writing.
		require -- from SED_READER_WRITER
			is_ready: is_ready_for_reading
		do
			from
			until
				is_last_chunk
			loop
				read_buffer_from_medium
			end
		end

	conforms_to (other: ANY): BOOLEAN
			-- Does type of current object conform to type
			-- of other (as per Eiffel: The Language, chapter 13)?
			-- (from ANY)
		require -- from ANY
			other_not_void: other /= Void
		external
			"built_in"
		end

	is_for_reading: BOOLEAN
			-- Will current do a read operation?
			-- (from SED_BINARY_READER_WRITER)

	is_last_chunk: BOOLEAN
			-- Are we reading the last chunk?

	is_pointer_value_stored: BOOLEAN
			-- Is value of a POINTER stored?
			-- (from SED_READER_WRITER)

	is_ready_for_reading: BOOLEAN
			-- Is Current ready for future read operations?
		require -- from  SED_READER_WRITER
			True
		do
			Result := is_for_reading and then medium.exists and then medium.is_open_read and then medium.support_storable and then medium.readable
		end

	is_ready_for_writing: BOOLEAN
			-- Is Current ready for future write operations?
		require -- from  SED_READER_WRITER
			True
		do
			Result := not is_for_reading and then medium.exists and then medium.is_open_write and then medium.support_storable
		end

	same_type (other: ANY): BOOLEAN
			-- Is type of current object identical to type of other?
			-- (from ANY)
		require -- from ANY
			other_not_void: other /= Void
		external
			"built_in"
		ensure -- from ANY
			definition: Result = (conforms_to (other) and other.conforms_to (Current))
		end
	
feature -- Element change

	write_boolean (v: BOOLEAN)
			-- Write v.
			-- (from SED_READER_WRITER)
		require -- from SED_READER_WRITER
			is_ready: is_ready_for_writing
		do
			if v then
				write_natural_8 (1)
			else
				write_natural_8 (0)
			end
		end

	write_character_32 (v: CHARACTER_32)
			-- Write v.
			-- (from SED_READER_WRITER)
		require -- from SED_READER_WRITER
			is_ready: is_ready_for_writing
		do
			write_natural_32 (v.natural_32_code)
		end

	write_character_8 (v: CHARACTER_8)
			-- Write v.
			-- (from SED_READER_WRITER)
		require -- from SED_READER_WRITER
			is_ready: is_ready_for_writing
		do
			write_natural_8 (v.code.to_natural_8)
		end

	write_compressed_integer_32 (v: INTEGER_32)
			-- Write v as a compressed integer_32.
			-- See write_compressed_natural_32 for details about encoding.
			-- (from SED_READER_WRITER)
		require -- from SED_READER_WRITER
			is_ready: is_ready_for_writing
		do
			write_compressed_natural_32 (v.as_natural_32)
		end

	write_compressed_natural_32 (v: NATURAL_32)
			-- Write v as a compressed natural_32.
			-- Depending on value of v, it will tell how many natural_8 will
			-- be written. Below here is the actual encoding where x represents
			-- a meaningful bit for v and the last number in parenthesis is the
			-- marker value in hexadecimal which is added to the value of v.
			-- 1 - For values between 0 and 127, write 0xxxxxxx (0x00).
			-- 2 - For values between 128 and 16382, write 0x10xxxxxx xxxxxxxx (0xE0).
			-- 3 - For values between 16383 and 2097150, write 0x110xxxxx xxxxxxxx xxxxxxxx (0xC0).
			-- 4 - For values between 2097151 and 268435454, write 0x1110xxx xxxxxxxx xxxxxxxx xxxxxxxx (0xE0).
			-- 5 - Otherwise write v as a full natural_32.
			-- (from SED_READER_WRITER)
		require -- from SED_READER_WRITER
			is_ready: is_ready_for_writing
		do
			if v < 16384 then
				if v < 128 then
					write_natural_8 (v.as_natural_8)
				else
					write_natural_8 ((((v | 32768) & 65280) |>> 8).as_natural_8)
					write_natural_8 ((v & 255).as_natural_8)
				end
			elseif v < 2097152 then
				write_natural_8 ((((v | 12582912) & 16711680) |>> 16).as_natural_8)
				write_natural_8 (((v & 65280) |>> 8).as_natural_8)
				write_natural_8 ((v & 255).as_natural_8)
			elseif v < 268435456 then
				write_natural_8 ((((v | 3758096384) & 4278190080) |>> 24).as_natural_8)
				write_natural_8 (((v & 16711680) |>> 16).as_natural_8)
				write_natural_8 (((v & 65280) |>> 8).as_natural_8)
				write_natural_8 ((v & 255).as_natural_8)
			else
				write_natural_8 (240)
				write_natural_32 (v)
			end
		end

	write_immutable_string_8 (v: IMMUTABLE_STRING_8)
		obsolete "Use `write_string_8' instead. [2017-05-31]"
			-- Write v.
			-- (from SED_READER_WRITER)
		require -- from SED_READER_WRITER
			is_ready: is_ready_for_writing
			v_not_void: v /= Void
		do
			write_string_8 (v)
		end

	write_integer_16 (v: INTEGER_16)
			-- Write v.
			-- (from SED_BINARY_READER_WRITER)
		require -- from SED_READER_WRITER
			is_ready: is_ready_for_writing
		do
			check
				correct_size: {PLATFORM}.natural_16_bytes = {PLATFORM}.integer_16_bytes
			end
			write_natural_16 (v.as_natural_16)
		end

	write_integer_32 (v: INTEGER_32)
			-- Write v.
			-- (from SED_BINARY_READER_WRITER)
		require -- from SED_READER_WRITER
			is_ready: is_ready_for_writing
		do
			check
				correct_size: {PLATFORM}.natural_32_bytes = {PLATFORM}.integer_32_bytes
			end
			write_natural_32 (v.as_natural_32)
		end

	write_integer_64 (v: INTEGER_64)
			-- Write v.
			-- (from SED_BINARY_READER_WRITER)
		require -- from SED_READER_WRITER
			is_ready: is_ready_for_writing
		do
			check
				correct_size: {PLATFORM}.natural_64_bytes = {PLATFORM}.integer_64_bytes
			end
			write_natural_64 (v.as_natural_64)
		end

	write_integer_8 (v: INTEGER_8)
			-- Write v.
			-- (from SED_BINARY_READER_WRITER)
		require -- from SED_READER_WRITER
			is_ready: is_ready_for_writing
		do
			check
				correct_size: {PLATFORM}.natural_8_bytes = {PLATFORM}.integer_8_bytes
			end
			write_natural_8 (v.as_natural_8)
		end

	write_natural_16 (v: NATURAL_16)
			-- Write v.
			-- (from SED_BINARY_READER_WRITER)
		require -- from SED_READER_WRITER
			is_ready: is_ready_for_writing
		local
			l_pos: INTEGER_32
		do
			check_buffer ({PLATFORM}.natural_16_bytes)
			l_pos := buffer_position
			if is_little_endian_storable then
				buffer.put_natural_16_le (v, l_pos)
			else
				buffer.put_natural_16_be (v, l_pos)
			end
			l_pos := l_pos + {PLATFORM}.natural_16_bytes
			buffer_position := l_pos
		end

	write_natural_32 (v: NATURAL_32)
			-- Write v.
			-- (from SED_BINARY_READER_WRITER)
		require -- from SED_READER_WRITER
			is_ready: is_ready_for_writing
		local
			l_pos: INTEGER_32
		do
			check_buffer ({PLATFORM}.natural_32_bytes)
			l_pos := buffer_position
			if is_little_endian_storable then
				buffer.put_natural_32_le (v, l_pos)
			else
				buffer.put_natural_32_be (v, l_pos)
			end
			l_pos := l_pos + {PLATFORM}.natural_32_bytes
			buffer_position := l_pos
		end

	write_natural_64 (v: NATURAL_64)
			-- Write v.
			-- (from SED_BINARY_READER_WRITER)
		require -- from SED_READER_WRITER
			is_ready: is_ready_for_writing
		local
			l_pos: INTEGER_32
		do
			check_buffer ({PLATFORM}.natural_64_bytes)
			l_pos := buffer_position
			if is_little_endian_storable then
				buffer.put_natural_64_le (v, l_pos)
			else
				buffer.put_natural_64_be (v, l_pos)
			end
			l_pos := l_pos + {PLATFORM}.natural_64_bytes
			buffer_position := l_pos
		end

	write_natural_8 (v: NATURAL_8)
			-- Write v.
			-- (from SED_BINARY_READER_WRITER)
		require -- from SED_READER_WRITER
			is_ready: is_ready_for_writing
		local
			l_pos: INTEGER_32
		do
			check_buffer ({PLATFORM}.natural_8_bytes)
			l_pos := buffer_position;
			buffer.put_natural_8 (v, l_pos)
			l_pos := l_pos + {PLATFORM}.natural_8_bytes
			buffer_position := l_pos
		end

	write_pointer (v: POINTER)
			-- Write v.
			-- (from SED_BINARY_READER_WRITER)
		require -- from SED_READER_WRITER
			is_ready: is_ready_for_writing
		local
			l_val32: NATURAL_32
			l_val64: NATURAL_64
		do
			if is_pointer_value_stored then
				if {PLATFORM}.pointer_bytes = {PLATFORM}.natural_32_bytes then
					($l_val32).memory_copy ($v.to_pointer, {PLATFORM}.natural_32_bytes)
					write_natural_32 (l_val32)
				elseif {PLATFORM}.pointer_bytes = {PLATFORM}.natural_64_bytes then
					($l_val64).memory_copy ($v.to_pointer, {PLATFORM}.natural_64_bytes)
					write_natural_64 (l_val64)
				else
					check
						not_supported: False
					end
				end
			end
		end

	write_real_32 (v: REAL_32)
			-- Write v.
			-- (from SED_BINARY_READER_WRITER)
		require -- from SED_READER_WRITER
			is_ready: is_ready_for_writing
		local
			l_pos: INTEGER_32
		do
			check_buffer ({PLATFORM}.real_32_bytes)
			l_pos := buffer_position
			if is_little_endian_storable then
				buffer.put_real_32_le (v, l_pos)
			else
				buffer.put_real_32_be (v, l_pos)
			end
			l_pos := l_pos + {PLATFORM}.real_32_bytes
			buffer_position := l_pos
		end

	write_real_64 (v: REAL_64)
			-- Write v.
			-- (from SED_BINARY_READER_WRITER)
		require -- from SED_READER_WRITER
			is_ready: is_ready_for_writing
		local
			l_pos: INTEGER_32
		do
			check_buffer ({PLATFORM}.real_64_bytes)
			l_pos := buffer_position
			if is_little_endian_storable then
				buffer.put_real_64_le (v, l_pos)
			else
				buffer.put_real_64_be (v, l_pos)
			end
			l_pos := l_pos + {PLATFORM}.real_64_bytes
			buffer_position := l_pos
		end

	write_string_32 (v: READABLE_STRING_GENERAL)
			-- Write v in UTF-8 format.
			-- (from SED_READER_WRITER)
		require -- from SED_READER_WRITER
			is_ready: is_ready_for_writing
			v_not_void: v /= Void
		local
			u: UTF_CONVERTER
		do
			write_string_8 (u.utf_32_string_to_utf_8_string_8 (v))
		end

	write_string_8 (v: READABLE_STRING_8)
			-- Write v.
			-- (from SED_READER_WRITER)
		require -- from SED_READER_WRITER
			is_ready: is_ready_for_writing
			v_not_void: v /= Void
		local
			i, nb: INTEGER_32
		do
			write_compressed_natural_32 (v.count.to_natural_32)
			from
				i := 1
				nb := v.count + 1
			until
				i = nb
			loop
				write_character_8 (v.item (i))
				i := i + 1
			end
		end
	
feature -- Duplication

	frozen clone (other: detachable ANY): like other
		obsolete "Use `twin' instead. [2017-05-31]"
			-- Void if other is void; otherwise new object
			-- equal to other
			--
			-- For non-void other, clone calls copy;
			-- to change copying/cloning semantics, redefine copy.
			-- (from ANY)
		do
			if other /= Void then
				Result := other.twin
			end
		ensure -- from ANY
			instance_free: class
			equal: Result ~ other
		end

	copy (other: SED_MEDIUM_READER_WRITER)
			-- Update current object using fields of object attached
			-- to other, so as to yield equal objects.
			-- (from ANY)
		require -- from ANY
			other_not_void: other /= Void
			type_identity: same_type (other)
		external
			"built_in"
		ensure -- from ANY
			is_equal: Current ~ other
		end

	frozen deep_clone (other: detachable ANY): like other
		obsolete "Use `deep_twin' instead. [2017-05-31]"
			-- Void if other is void: otherwise, new object structure
			-- recursively duplicated from the one attached to other
			-- (from ANY)
		do
			if other /= Void then
				Result := other.deep_twin
			end
		ensure -- from ANY
			instance_free: class
			deep_equal: deep_equal (other, Result)
		end

	frozen deep_copy (other: SED_MEDIUM_READER_WRITER)
			-- Effect equivalent to that of:
			--		copy (other . deep_twin)
			-- (from ANY)
		require -- from ANY
			other_not_void: other /= Void
		do
			copy (other.deep_twin)
		ensure -- from ANY
			deep_equal: deep_equal (Current, other)
		end

	frozen deep_twin: SED_MEDIUM_READER_WRITER
			-- New object structure recursively duplicated from Current.
			-- (from ANY)
		external
			"built_in"
		ensure -- from ANY
			deep_twin_not_void: Result /= Void
			deep_equal: deep_equal (Current, Result)
		end

	frozen standard_clone (other: detachable ANY): like other
		obsolete "Use `standard_twin' instead. [2017-05-31]"
			-- Void if other is void; otherwise new object
			-- field-by-field identical to other.
			-- Always uses default copying semantics.
			-- (from ANY)
		do
			if other /= Void then
				Result := other.standard_twin
			end
		ensure -- from ANY
			instance_free: class
			equal: standard_equal (Result, other)
		end

	frozen standard_copy (other: SED_MEDIUM_READER_WRITER)
			-- Copy every field of other onto corresponding field
			-- of current object.
			-- (from ANY)
		require -- from ANY
			other_not_void: other /= Void
			type_identity: same_type (other)
		external
			"built_in"
		ensure -- from ANY
			is_standard_equal: standard_is_equal (other)
		end

	frozen standard_twin: SED_MEDIUM_READER_WRITER
			-- New object field-by-field identical to other.
			-- Always uses default copying semantics.
			-- (from ANY)
		external
			"built_in"
		ensure -- from ANY
			standard_twin_not_void: Result /= Void
			equal: standard_equal (Result, Current)
		end

	frozen twin: SED_MEDIUM_READER_WRITER
			-- New object equal to Current
			-- twin calls copy; to change copying/twinning semantics, redefine copy.
			-- (from ANY)
		external
			"built_in"
		ensure -- from ANY
			twin_not_void: Result /= Void
			is_equal: Result ~ Current
		end
	
feature -- Basic operations

	frozen as_attached: attached SED_MEDIUM_READER_WRITER
		obsolete "Remove calls to this feature. [2017-05-31]"
			-- Attached version of Current.
			-- (Can be used during transitional period to convert
			-- non-void-safe classes to void-safe ones.)
			-- (from ANY)
		do
			Result := Current
		end

	frozen default: detachable SED_MEDIUM_READER_WRITER
			-- Default value of object's type
			-- (from ANY)
		do
		end

	frozen default_pointer: POINTER
			-- Default value of type POINTER
			-- (Avoid the need to write p.default for
			-- some p of type POINTER.)
			-- (from ANY)
		do
		ensure -- from ANY
			instance_free: class
		end

	default_rescue
			-- Process exception for routines with no Rescue clause.
			-- (Default: do nothing.)
			-- (from ANY)
		do
		end

	frozen do_nothing
			-- Execute a null action.
			-- (from ANY)
		do
		ensure -- from ANY
			instance_free: class
		end
	
feature -- Access bits size

	boolean_bits: INTEGER_32
			-- Number of bits in a value of type BOOLEAN
			-- (from PLATFORM)
		do
			Result := boolean_bytes * 8
		ensure -- from PLATFORM
			instance_free: class
		end

	Character_32_bits: INTEGER_32 = 32
			-- Number of bits in a value of type CHARACTER_32
			-- (from PLATFORM)

	Character_8_bits: INTEGER_32 = 8
			-- Number of bits in a value of type CHARACTER_8
			-- (from PLATFORM)

	Integer_16_bits: INTEGER_32 = 16
			-- Number of bits in a value of type INTEGER_16
			-- (from PLATFORM)

	Integer_32_bits: INTEGER_32 = 32
			-- Number of bits in a value of type INTEGER_32
			-- (from PLATFORM)

	Integer_64_bits: INTEGER_32 = 64
			-- Number of bits in a value of type INTEGER_64
			-- (from PLATFORM)

	Integer_8_bits: INTEGER_32 = 8
			-- Number of bits in a value of type INTEGER_8
			-- (from PLATFORM)

	Natural_16_bits: INTEGER_32 = 16
			-- Number of bits in a value of type NATURAL_16
			-- (from PLATFORM)

	Natural_32_bits: INTEGER_32 = 32
			-- Number of bits in a value of type NATURAL_32
			-- (from PLATFORM)

	Natural_64_bits: INTEGER_32 = 64
			-- Number of bits in a value of type NATURAL_64
			-- (from PLATFORM)

	Natural_8_bits: INTEGER_32 = 8
			-- Number of bits in a value of type NATURAL_8
			-- (from PLATFORM)

	pointer_bits: INTEGER_32
			-- Number of bits in a value of type POINTER
			-- (from PLATFORM)
		do
			Result := pointer_bytes * 8
		ensure -- from PLATFORM
			instance_free: class
		end

	Real_32_bits: INTEGER_32 = 32
			-- Number of bits in a value of type REAL_32
			-- (from PLATFORM)

	Real_64_bits: INTEGER_32 = 64
			-- Number of bits in a value of type REAL_64
			-- (from PLATFORM)
	
feature -- Access bytes size

	boolean_bytes: INTEGER_32
			-- Number of bytes in a value of type BOOLEAN
			-- (from PLATFORM)
		external
			"built_in static"
		ensure -- from PLATFORM
			instance_free: class
		end

	Character_32_bytes: INTEGER_32 = 4
			-- Number of bytes in a value of type CHARACTER_32
			-- (from PLATFORM)

	Character_8_bytes: INTEGER_32 = 1
			-- Number of bytes in a value of type CHARACTER_8
			-- (from PLATFORM)

	Integer_16_bytes: INTEGER_32 = 2
			-- Number of bytes in a value of type INTEGER_16
			-- (from PLATFORM)

	Integer_32_bytes: INTEGER_32 = 4
			-- Number of bytes in a value of type INTEGER_32
			-- (from PLATFORM)

	Integer_64_bytes: INTEGER_32 = 8
			-- Number of bytes in a value of type INTEGER_64
			-- (from PLATFORM)

	Integer_8_bytes: INTEGER_32 = 1
			-- Number of bytes in a value of type INTEGER_8
			-- (from PLATFORM)

	Natural_16_bytes: INTEGER_32 = 2
			-- Number of bytes in a value of type NATURAL_16
			-- (from PLATFORM)

	Natural_32_bytes: INTEGER_32 = 4
			-- Number of bytes in a value of type NATURAL_32
			-- (from PLATFORM)

	Natural_64_bytes: INTEGER_32 = 8
			-- Number of bytes in a value of type NATURAL_64
			-- (from PLATFORM)

	Natural_8_bytes: INTEGER_32 = 1
			-- Number of bytes in a value of type NATURAL_8
			-- (from PLATFORM)

	pointer_bytes: INTEGER_32
			-- Number of bytes in a value of type POINTER
			-- (from PLATFORM)
		external
			"built_in static"
		ensure -- from PLATFORM
			instance_free: class
		end

	Real_32_bytes: INTEGER_32 = 4
			-- Number of bytes in a value of type REAL_32
			-- (from PLATFORM)

	Real_64_bytes: INTEGER_32 = 8
			-- Number of bytes in a value of type REAL_64
			-- (from PLATFORM)
	
feature {NONE} -- Buffer update

	check_buffer (n: INTEGER_32)
			-- If there is enough space in buffer to read n bytes, do nothing.
			-- Otherwise, read/write to medium to free some space.
		require -- from SED_BINARY_READER_WRITER
			n_non_negative: n >= 0
		do
			if n + buffer_position > buffer_size then
				if is_for_reading then
					read_buffer_from_medium
				else
					flush_buffer_to_medium (False)
				end
			end
		end

	flush_buffer_to_medium (last_chunk: BOOLEAN)
			-- Write next chunk of data to medium.
		require
			is_ready: is_ready_for_writing
		do
			buffer.put_integer_32_be (buffer_position, size_position (True));
			buffer.put_boolean (last_chunk, new_chunk_position);
			medium.put_managed_pointer (buffer, 0, buffer_position)
			write_chunk_header
		end

	read_buffer_from_medium
			-- Read next chunk of data.
		require
			is_ready: is_ready_for_reading
		local
			l_version: NATURAL_32
			l_is_new_format: BOOLEAN
			l_failure: SERIALIZATION_FAILURE
		do
			medium.read_to_managed_pointer (buffer, 0, {PLATFORM}.integer_32_bytes)
			if medium.bytes_read = {PLATFORM}.integer_32_bytes then
				buffer_size := buffer.read_integer_32_be (0)
				is_last_chunk := True
				if buffer_size = -1 then
					l_is_new_format := True;
					medium.read_to_managed_pointer (buffer, version_position, {PLATFORM}.integer_32_bytes)
					l_version := buffer.read_natural_32_be (version_position)
					if l_version = Reader_writer_version_6_6 then
						medium.read_to_managed_pointer (buffer, size_position (True), {PLATFORM}.integer_32_bytes)
						buffer_size := buffer.read_integer_32_be (size_position (True));
						medium.read_to_managed_pointer (buffer, new_chunk_position, {PLATFORM}.boolean_bytes)
						is_last_chunk := buffer.read_boolean (new_chunk_position)
					end
				else
					l_is_new_format := False
				end
				buffer_position := chunk_header_size (l_is_new_format)
				if buffer_size > buffer.count then
					buffer.resize (buffer_size)
				end
				if buffer_size > {PLATFORM}.integer_32_bytes then
					medium.read_to_managed_pointer (buffer, buffer_position, buffer_size - buffer_position)
					if medium.bytes_read /= buffer_size - buffer_position then
						buffer_position := 0
						buffer_size := buffer.count
						create l_failure;
						l_failure.set_description ("Read less than expected number of bytes in buffer.");
						l_failure.raise
					end
				else
					buffer_position := 0
					buffer_size := buffer.count
					create l_failure;
					l_failure.set_description ("Read less than 4 bytes in buffer's header.");
					l_failure.raise
				end
			else
				buffer_position := 0
				buffer_size := buffer.count
				create l_failure;
				l_failure.set_description ("Cannot read buffer size from header.");
				l_failure.raise
			end
		end
	
feature -- Header/Footer

	read_footer
			-- Action being executed after finishing to read data.
			-- (from SED_READER_WRITER)
		require -- from SED_READER_WRITER
			is_ready: is_ready_for_reading
		do
		end

	read_header
			-- Retrieve configuration of how data was stored.
		require -- from SED_READER_WRITER
			is_ready: is_ready_for_reading
		do
			read_buffer_from_medium
			is_little_endian_storable := read_boolean
			is_pointer_value_stored := read_boolean
			stored_pointer_bytes := read_integer_32
		end

	write_chunk_header
			-- Store information about chunks
		do
			buffer_position := 0;
			buffer.put_integer_32_be (-1, 0)
			buffer_position := buffer_position + {PLATFORM}.integer_32_bytes;
			buffer.put_natural_32_be (Reader_writer_version_6_6, buffer_position)
			buffer_position := buffer_position + {PLATFORM}.natural_32_bytes
			buffer_position := buffer_position + {PLATFORM}.integer_32_bytes
			buffer_position := buffer_position + {PLATFORM}.boolean_bytes
		end

	write_footer
			-- Store last buffered data.
		require -- from SED_READER_WRITER
			is_ready: is_ready_for_writing
		do
			flush_buffer_to_medium (True)
		end

	write_header
			-- Store configuration on how data will be stored.
		require -- from SED_READER_WRITER
			is_ready: is_ready_for_writing
		do
			buffer_size := buffer.count
			check
				enough_space: buffer.count > {PLATFORM}.integer_32_bytes * 4 + {PLATFORM}.boolean_bytes * 2
			end
			is_little_endian_storable := Is_little_endian
			write_chunk_header
			write_boolean (is_little_endian_storable)
			write_boolean (is_pointer_value_stored)
			write_integer_32 ({PLATFORM}.pointer_bytes)
		end
	
feature {NONE} -- Implementation: Access

	buffer: MANAGED_POINTER
			-- Buffer to store/fetch data from medium
			-- (from SED_BINARY_READER_WRITER)

	chunk_header_size (a_is_new_format: BOOLEAN): INTEGER_32
			-- Size of data
		do
			Result := {PLATFORM}.integer_32_bytes
			if a_is_new_format then
				Result := Result + {PLATFORM}.natural_32_bytes + {PLATFORM}.integer_32_bytes + {PLATFORM}.boolean_bytes
			end
		end

	medium: IO_MEDIUM
			-- Medium used for read/write operations

	new_chunk_position: INTEGER_32
			-- Position where presence or not of a next chunk is stored.
		do
			Result := size_position (True) + {PLATFORM}.integer_32_bytes
		end

	size_position (a_is_new_format: BOOLEAN): INTEGER_32
			-- Position where size information for current chunk is stored.
		do
			if a_is_new_format then
				Result := version_position + {PLATFORM}.natural_32_bytes
			else
				Result := 0
			end
		end

	version_position: INTEGER_32
			-- Position where information about version is stored
		do
			Result := size_position (False) + {PLATFORM}.integer_32_bytes
		end
	
feature {NONE} -- Implementation: Status report

	buffer_position: INTEGER_32
			-- Position in buffer for next read/write operation
			-- (from SED_BINARY_READER_WRITER)

	buffer_size: INTEGER_32
			-- Size for buffer to reduce access to medium
			-- (from SED_BINARY_READER_WRITER)

	Default_buffer_size: INTEGER_32 = 262144
			-- Default size for buffer
			-- (from SED_BINARY_READER_WRITER)

	is_little_endian_storable: BOOLEAN
			-- If is_for_reading, encoding used to write data.
			-- Otherwise encoding that will be used to write data.
			-- (from SED_BINARY_READER_WRITER)

	stored_pointer_bytes: INTEGER_32
			-- Size of pointers in bytes used to write data.
			-- (from SED_BINARY_READER_WRITER)
	
feature -- Obsoletes

	character_bits: INTEGER_32
		obsolete "Use `character_8_bits' instead. [2017-05-31]"
			-- Number of bits in a value of type CHARACTER_8
			-- (from PLATFORM)
		do
			Result := 8
		ensure -- from PLATFORM
			instance_free: class
		end

	character_bytes: INTEGER_32
		obsolete "Use `character_8_bytes' instead. [2017-05-31]"
			-- Number of bytes in a value of type CHARACTER_8
			-- (from PLATFORM)
		external
			"built_in static"
		ensure -- from PLATFORM
			instance_free: class
		end

	double_bits: INTEGER_32
		obsolete "Use `real_64_bits' instead. [2017-05-31]"
			-- Number of bits in a value of type REAL_64
			-- (from PLATFORM)
		do
			Result := 64
		ensure -- from PLATFORM
			instance_free: class
		end

	double_bytes: INTEGER_32
		obsolete "Use `real_64_bytes' instead. [2017-05-31]"
			-- Number of bytes in a value of type REAL_64
			-- (from PLATFORM)
		external
			"built_in static"
		ensure -- from PLATFORM
			instance_free: class
		end

	integer_bits: INTEGER_32
		obsolete "Use `integer_32_bits' instead. [2017-05-31]"
			-- Number of bits in a value of type INTEGER_32
			-- (from PLATFORM)
		do
			Result := 32
		ensure -- from PLATFORM
			instance_free: class
		end

	integer_bytes: INTEGER_32
		obsolete "Use `integer_32_bytes' instead. [2017-05-31]"
			-- Number of bytes in a value of type INTEGER_32
			-- (from PLATFORM)
		external
			"built_in static"
		ensure -- from PLATFORM
			instance_free: class
		end

	maximum_character_code: INTEGER_32
		obsolete "Use `{CHARACTER_8}.max_value' instead. [2017-05-31]"
			-- Largest supported code for CHARACTER_8 values
			-- (from PLATFORM)
		do
			Result := {CHARACTER_8}.max_value
		ensure -- from PLATFORM
			instance_free: class
			meaningful: Result >= 127
		end

	maximum_integer: INTEGER_32
		obsolete "Use `{INTEGER}.max_value' instead. [2017-05-31]"
			-- Largest supported value of type INTEGER_32
			-- (from PLATFORM)
		do
			Result := {INTEGER_32}.max_value
		ensure -- from PLATFORM
			instance_free: class
			meaningful: Result >= 0
		end

	minimum_character_code: INTEGER_32
		obsolete "Use `{CHARACTER_8}.min_value' instead. [2017-05-31]"
			-- Smallest supported code for CHARACTER_8 values
			-- (from PLATFORM)
		do
			Result := {CHARACTER_8}.min_value
		ensure -- from PLATFORM
			instance_free: class
			meaningful: Result <= 0
		end

	minimum_integer: INTEGER_32
		obsolete "Use `{INTEGER}.min_value' instead. [2017-05-31]"
			-- Smallest supported value of type INTEGER_32
			-- (from PLATFORM)
		do
			Result := {INTEGER_32}.min_value
		ensure -- from PLATFORM
			instance_free: class
			meaningful: Result <= 0
		end

	real_bits: INTEGER_32
		obsolete "Use `real_32_bits' instead. [2017-05-31]"
			-- Number of bits in a value of type REAL_32
			-- (from PLATFORM)
		do
			Result := 32
		ensure -- from PLATFORM
			instance_free: class
		end

	real_bytes: INTEGER_32
		obsolete "Use `real_32_bytes' instead. [2017-05-31]"
			-- Number of bytes in a value of type REAL_32
			-- (from PLATFORM)
		external
			"built_in static"
		ensure -- from PLATFORM
			instance_free: class
		end

	wide_character_bytes: INTEGER_32
		obsolete "Use `character_32_bytes' instead. [2017-05-31]"
			-- Number of bytes in a value of type CHARACTER_32
			-- (from PLATFORM)
		external
			"built_in static"
		ensure -- from PLATFORM
			instance_free: class
		end
	
feature -- Output

	Io: STD_FILES
			-- Handle to standard file setup
			-- (from ANY)
		once
			create Result;
			Result.set_output_default
		ensure -- from ANY
			instance_free: class
			io_not_void: Result /= Void
		end

	out: STRING_8
			-- New string containing terse printable representation
			-- of current object
			-- (from ANY)
		do
			Result := tagged_out
		ensure -- from ANY
			out_not_void: Result /= Void
		end

	print (o: detachable ANY)
			-- Write terse external representation of o
			-- on standard output.
			-- (from ANY)
		local
			s: READABLE_STRING_8
		do
			if attached o then
				s := o.out
				if attached {READABLE_STRING_32} s as s32 then
					Io.put_string_32 (s32)
				elseif attached {READABLE_STRING_8} s as s8 then
					Io.put_string (s8)
				else
					Io.put_string_32 (s.as_string_32)
				end
			end
		ensure -- from ANY
			instance_free: class
		end

	frozen tagged_out: STRING_8
			-- New string containing terse printable representation
			-- of current object
			-- (from ANY)
		external
			"built_in"
		ensure -- from ANY
			tagged_out_not_void: Result /= Void
		end
	
feature -- Platform

	is_64_bits: BOOLEAN
			-- Is the current process runing in 64-bit mode
			-- (from PLATFORM)
		external
			"built_in static"
		ensure -- from PLATFORM
			instance_free: class
		end

	is_dotnet: BOOLEAN
			-- Are we targetting .NET?
			-- (from PLATFORM)
		external
			"built_in static"
		ensure -- from PLATFORM
			instance_free: class
		end

	Is_little_endian: BOOLEAN
			-- Is current platform a little endian one?
			-- (from PLATFORM)
		local
			l_nat16: NATURAL_16
			l_nat8: NATURAL_8
			l_first: NATURAL_8
		once
			l_nat16 := 17185
			l_nat8 := 33;
			($l_first).memory_copy ($l_nat16.to_pointer, 1)
			Result := l_first = l_nat8
		ensure -- from PLATFORM
			instance_free: class
		end

	is_mac: BOOLEAN
			-- Are we running on Mac OS?
			-- (from PLATFORM)
		external
			"built_in static"
		ensure -- from PLATFORM
			instance_free: class
		end

	is_scoop_capable: BOOLEAN
			-- Is current platform capable of SCOOP?
			-- (from PLATFORM)
		external
			"built_in static"
		ensure -- from PLATFORM
			instance_free: class
		end

	is_thread_capable: BOOLEAN
			-- Is current platform capable of multi-threading?
			-- (from PLATFORM)
		external
			"built_in static"
		ensure -- from PLATFORM
			instance_free: class
		end

	is_unix: BOOLEAN
			-- Are we running on a Unix like platform?
			-- (from PLATFORM)
		external
			"built_in static"
		ensure -- from PLATFORM
			instance_free: class
		end

	is_vms: BOOLEAN
			-- Are we running on VMS?
			-- (from PLATFORM)
		external
			"built_in static"
		ensure -- from PLATFORM
			instance_free: class
		end

	is_vxworks: BOOLEAN
			-- Are we running on VxWorks?
			-- (from PLATFORM)
		external
			"built_in static"
		ensure -- from PLATFORM
			instance_free: class
		end

	is_windows: BOOLEAN
			-- Are we running on Windows platform?
			-- (from PLATFORM)
		external
			"built_in static"
		ensure -- from PLATFORM
			instance_free: class
		end

	Operating_environment: OPERATING_ENVIRONMENT
			-- Objects available from the operating system
			-- (from ANY)
		once
			create Result
		ensure -- from ANY
			instance_free: class
			operating_environment_not_void: Result /= Void
		end
	
feature {NONE} -- Retrieval

	frozen internal_correct_mismatch
			-- Called from runtime to perform a proper dynamic dispatch on correct_mismatch
			-- from MISMATCH_CORRECTOR.
			-- (from ANY)
		local
			l_msg: STRING_32
			l_exc: EXCEPTIONS
		do
			if attached {MISMATCH_CORRECTOR} Current as l_corrector then
				l_corrector.correct_mismatch
			else
				create l_msg.make_from_string ("Mismatch: ".as_string_32)
				create l_exc;
				l_msg.append (generating_type.name_32);
				l_exc.raise_retrieval_exception (l_msg)
			end
		end
	
feature -- Settings

	set_for_reading
			-- Set current for reading.
			-- (from SED_BINARY_READER_WRITER)
		do
			is_for_reading := True
		ensure -- from SED_BINARY_READER_WRITER
			is_for_reading: is_for_reading
		end

	set_for_writing
			-- Set current for writing.
			-- (from SED_BINARY_READER_WRITER)
		do
			is_for_reading := False
		ensure -- from SED_BINARY_READER_WRITER
			is_for_writing: not is_for_reading
		end

	set_is_pointer_value_stored (v: like is_pointer_value_stored)
			-- Set is_pointer_value_stored with v.
			-- (from SED_READER_WRITER)
		do
			is_pointer_value_stored := v
		ensure -- from SED_READER_WRITER
			is_pointer_value_stored_set: is_pointer_value_stored = v
		end
	
invariant
	medium_not_void: medium /= Void

		-- from SED_BINARY_READER_WRITER
	buffer_not_void: buffer /= Void
	buffer_size_non_negative: buffer_size >= 0
	buffer_position_non_negative: buffer_position >= 0
	stored_pointer_bytes_non_negative: stored_pointer_bytes >= 0

		-- from ANY
	reflexive_equality: standard_is_equal (Current)
	reflexive_conformance: conforms_to (Current)

note
	library: "EiffelBase: Library of reusable components for Eiffel."
	copyright: "Copyright (c) 1984-2017, Eiffel Software and others"
	license: "Eiffel Forum License v2 (see http://www.eiffel.com/licensing/forum.txt)"
	source: "[
		Eiffel Software
		5949 Hollister Ave., Goleta, CA 93117 USA
		Telephone 805-685-1006, Fax 805-685-6869
		Website http://www.eiffel.com
		Customer support http://support.eiffel.com
	]"

end -- class SED_MEDIUM_READER_WRITER

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