class_name ByteStream


var bytes: PackedByteArray

var position: int = 0


@warning_ignore("shadowed_variable")
static func from_bytes(bytes: PackedByteArray) -> ByteStream:
	var byte_stream = ByteStream.new()
	
	byte_stream.bytes = bytes
	
	return byte_stream


@warning_ignore("shadowed_variable")
func seek(position: int) -> void:
	if position > 0:
		assert(position <= bytes.size())
	
	self.position = position


func advance(jumps: int) -> void:
	position += jumps


func available() -> int:
	return bytes.size() - position


func get_buffer(length: int) -> ByteStream:
	var byte_stream = ByteStream.from_bytes(
		bytes.slice(position, position + length)
	)
	
	seek(position + length)
	
	return byte_stream


func decode_u8() -> int:
	var result = bytes.decode_u8(position)
	seek(position + 1)
	
	return result

func decode_u16() -> int:
	var result = bytes.decode_u16(position)
	seek(position + 2)
	
	return result

func decode_u32() -> int:
	var result = bytes.decode_u32(position)
	seek(position + 4)
	
	return result

func decode_u64() -> int:
	var result = bytes.decode_u64(position)
	seek(position + 8)
	
	return result

func decode_s8() -> int:
	var result = bytes.decode_s8(position)
	seek(position + 1)
	
	return result

func decode_s16() -> int:
	var result = bytes.decode_s16(position)
	seek(position + 2)
	
	return result

func decode_s32() -> int:
	var result = bytes.decode_s32(position)
	seek(position + 4)
	
	return result

func decode_s64() -> int:
	var result = bytes.decode_s64(position)
	seek(position + 8)
	
	return result

func decode_float() -> float:
	var result = bytes.decode_float(position)
	seek(position + 4)
	
	return result

func get_string_from_utf8(length: int) -> String:
	return get_buffer(length).bytes.get_string_from_utf8()