reMarkable lines format (v3 and v5)

rm_lines.ksy

meta:
  id: remarkable_lines
  file-extension: rm
  endian: le
seq:
  - id: header
    type: header
  - id: page
    type: page
enums:
  version:
    0x33: v3
    0x35: v5
    
  pen_type:
    0x06: eraser
    0x08: eraser_area
    0x10: marker
    0x11: fineliner
    0x0C: paintbrush
    0x0D: mechanical_pencil
    0x0E: pencil
    0x0F: ballpoint
    0x12: highlighter
    0x15: calligraphy
    
  color:
    0: black
    1: grey
    2: white
    
types:
  header:
    seq:
      - id: magic
        contents: 'reMarkable .lines file, version='
      - id: version_tag
        type: u1
        enum: version
      - id: spaces
        contents: '          '
  page:
    seq:
      - id: num_layers
        type: s4
      - id: layers
        type: layer
        repeat: expr
        repeat-expr: num_layers
  layer:
    seq:
      - id: num_lines
        type: s4
      - id: lines
        type: line
        repeat: expr
        repeat-expr: num_lines
  line:
    seq:
      - id: pen
        type: s4
        enum: pen_type
      - id: color
        type: s4
        enum: color
      - id: unknown1
        type: s4
      - id: brush_size
        type: f4
      - id: unknown2
        type: f4
        if: _root.header.version_tag == version::v5
      - id: num_points
        type: s4
      - id: points
        type: point
        repeat: expr
        repeat-expr: num_points
  point:
    seq:
      - id: x
        type: f4
      - id: y
        type: f4
      - id: speed
        type: f4
      - id: direction
        type: f4
      - id: width
        type: f4 
      - id: pressure
        type: f4