Description of Roblox attributes binary format.

attributes-format.txt

#endian:little

main Dictionary

type Value struct {
	Type uint:8
	if .Type == 00 {}
	if .Type == 01 {}
	if .Type == 02 {Value String}
	if .Type == 03 {Value Bool}
	if .Type == 04 {Value Int}
	if .Type == 05 {Value Float}
	if .Type == 06 {Value Double}
	if .Type == 07 {Value Array}
	if .Type == 08 {Value Dictionary}
	if .Type == 09 {Value UDim}
	if .Type == 10 {Value UDim2}
	if .Type == 11 {Value Ray}
	if .Type == 12 {Value Faces}
	if .Type == 13 {Value Axes}
	if .Type == 14 {Value BrickColor}
	if .Type == 15 {Value Color3}
	if .Type == 16 {Value Vector2}
	if .Type == 17 {Value Vector3}
	if .Type == 18 {Value Vector2int16}
	if .Type == 19 {Value Vector3int16}
	if .Type == 20 {Value CFrame}
	if .Type == 21 {Value EnumItem}
	if .Type == 22 {}
	if .Type == 23 {Value NumberSequence}
	if .Type == 24 {Value NumberSequenceKeypoint}
	if .Type == 25 {Value ColorSequence}
	if .Type == 26 {Value ColorSequenceKeypoint}
	if .Type == 27 {Value NumberRange}
	if .Type == 28 {Value Rect}
	if .Type == 29 {Value PhysicalProperties}
	if .Type == 30 {}
	if .Type == 31 {Value Region3}
	if .Type == 32 {Value Region3int16}
}

type String struct {
	Size  uint:32
	Value [.Size]uint:8
}

type Bool uint:8

type Int int:32

type Float float:32

type Double float:64

type Array struct {
	Size uint:32
	Entries [.Size]Value
}

type Dictionary struct {
	Size    uint:32
	Entries [.Size]Entry
}

type Entry struct {
	Key   String
	Value Value
}

type UDim struct {
	Scale  float:32
	Offset int:32
}

type UDim2 struct {
	X UDim
	Y UDim
}

type Ray struct {
	Origin    Vector3
	Direction Vector3
}

type Faces uint:32

type Axes uint:32

type BrickColor uint:32

type Color3 struct {
	R float:32
	G float:32
	B float:32
}

type Vector2 struct {
	X float:32
	Y float:32
}

type Vector3 struct {
	X float:32
	Y float:32
	Z float:32
}

type Vector2int16 struct {
	X int:16
	Y int:16
}

type Vector3int16 struct {
	X int:16
	Y int:16
	Z int:16
}

type CFrame struct {
	Position Vector3
	Special  uint:8
	if .Special == 0 {
		Rotation [9]float:32
	}
}

type EnumItem struct {
	Enum  String
	Value uint:32
}

type NumberSequence struct {
	Size uint:32
	Values [.Size]NumberSequenceKeypoint
}

type NumberSequenceKeypoint struct {
	Envelope float:32
	Time     float:32
	Value    float:32
}

type ColorSequence struct {
	Size uint:32
	Values [.Size]ColorSequenceKeypoint
}

type ColorSequenceKeypoint struct {
	Envelope float:32
	Time     float:32
	Value    Color3
}

type NumberRange struct {
	Min float:32
	Max float:32
}

type Rect struct {
	Min Vector2
	Max Vector2
}

type PhysicalProperties struct {
	CustomPhysics    uint:8
	Density          float:32
	Friction         float:32
	Elasticity       float:32
	FrictionWeight   float:32
	ElasticityWeight float:32
}

type Region3 struct {
	Min Vector3
	Max Vector3
}

type Region3int16 struct {
	Min Vector3int16
	Max Vector3int16
}