Kaitai XCF

gimp_xcf.ksy

meta:
  id: gimp_xcf
  file-extension: xcf
  xref:
    justsolve: XCF
    pronom: fmt/615
    mime-type: image/x-xcf
    mime-type: image/xcf
    wikidata: Q261907
  encoding: utf8
  endian: be
doc-ref: http://henning.makholm.net/xcftools/xcfspec-saved
doc-ref: https://gitlab.gnome.org/GNOME/gimp/-/blob/master/devel-docs/xcf.txt
seq:
  - id: magic
    contents: "gimp xcf "
  - id: version
    type: str
    size: 4
  - id: magic_nul
    contents: [0]
  - id: canvas_width
    type: u4
  - id: canvas_height
    type: u4
  - id: base_type
    type: u4
    enum: base_type
  - id: precision
    type: u4
    if: numeric_version >= 4
  - id: properties
    type: prop
    repeat: until
    repeat-until: _.end
  - id: layer_refs
    type: layer_ref
    repeat: until
    repeat-until: _.end
  - id: channel_refs
    type: channel_ref
    repeat: until
    repeat-until: _.end
instances:
  numeric_version:
    value: 'version == "file" ? 0 : version.substring(1, 4).to_i'
types:
  string:
    seq:
      - id: length
        type: u4
      - id: data
        type: strz
        size: length
    -webide-representation: '"{data}"'
  pointer:
    seq:
      - id: pointer
        # up to version v010 pointers were 4 bytes
        type:
          switch-on: _root.numeric_version <= 10
          cases:
            true: u4
            false: u8
  prop:
    instances:
      end:
        value: type == prop_type::prop_end
    seq:
      - id: type
        type: u4
        enum: prop_type
      - id: length
        type: u4
      - id: data
        size: length
    -webide-representation: "{type}"
  layer_ref:
    instances:
      end:
        value: ptr.pointer == 0
      ref:
        pos: ptr.pointer
        type: layer
        if: not end
    seq:
      - id: ptr
        type: pointer
  channel_ref:
    instances:
      end:
        value: ptr.pointer == 0
      ref:
        pos: ptr.pointer
        type: channel
        if: not end
    seq:
      - id: ptr
        type: pointer
  hierarchy_ref:
    instances:
      end:
        value: ptr.pointer == 0
      ref:
        pos: ptr.pointer
        type: hierarchy
        if: not end
    seq:
      - id: ptr
        type: pointer
  level_ref:
    instances:
      end:
        value: ptr.pointer == 0
      ref:
        pos: ptr.pointer
        type: level
        if: not end
    seq:
      - id: ptr
        type: pointer
  dummy_level_ref:
    instances:
      end:
        value: ptr.pointer == 0
      ref:
        pos: ptr.pointer
        type: dummy_level
        if: not end
    seq:
      - id: ptr
        type: pointer
  level:
    seq:
      - id: width
        type: u4
      - id: height
        type: u4
      - id: tile_ptrs
        type: pointer
        repeat: until
        repeat-until: _.pointer == 0
  dummy_level:
    seq:
      - id: width
        type: u4
      - id: height
        type: u4
      - id: tile_ptrs
        type: u4
        repeat: until
        repeat-until: _ == 0
  hierarchy:
    seq:
      - id: width
        type: u4
      - id: height
        type: u4
      - id: bpp
        type: u4
      - id: level_ref
        type: level_ref
      - id: dummy_level_refs
        type: dummy_level_ref
        repeat: until
        repeat-until: _.end
  channel:
    seq:
      - id: width
        type: u4
      - id: height
        type: u4
      - id: name
        type: string
      - id: properties
        type: prop
        repeat: until
        repeat-until: _.end
      - id: hierarchy_ref
        type: hierarchy_ref
  layer:
    seq:
      - id: width
        type: u4
      - id: height
        type: u4
      - id: type
        type: u4
      - id: name
        type: string
      - id: properties
        type: prop
        repeat: until
        repeat-until: _.end
      - id: hierarchy_ref
        type: hierarchy_ref
      - id: mask_ref
        type: channel_ref
enums:
  base_type:
    0: rgb_color
    1: grayscale
    2: indexed_color
  prop_type:
    0: prop_end
    1: prop_colormap
    2: prop_active_layer
    3: prop_active_channel
    4: prop_selection
    5: prop_floating_selection
    6: prop_opacity
    7: prop_mode
    8: prop_visible
    9: prop_linked
    10: prop_lock_alpha
    11: prop_apply_mask
    12: prop_edit_mask
    13: prop_show_mask
    14: prop_show_masked
    15: prop_offsets
    16: prop_color
    17: prop_compression
    18: prop_guides
    19: prop_resolution
    20: prop_tattoo
    21: prop_parasites
    22: prop_unit
    23: prop_paths
    24: prop_user_unit
    25: prop_vectors
    26: prop_text_layer_flags
    27: prop_old_sample_points
    28: prop_lock_content
    29: prop_group_item
    30: prop_item_path
    31: prop_group_item_flags
    32: prop_lock_position
    33: prop_float_opacity
    34: prop_color_tag
    35: prop_composite_mode
    36: prop_composite_space
    37: prop_blend_space
    38: prop_float_color
    39: prop_sample_points