Disk Copy 4.2 Kaitai

disccopy42.key.yaml

meta:
  id: diskcopy42
  file-extension: img
  endian: be
  bit-endian: be
doc-ref: https://web.archive.org/web/20201028142058/https://wiki.68kmla.org/DiskCopy_4.2_format_specification
seq:
  - id: name
    type: pstring
  - id: padding
    size: 63 - name.len
  - id: data_size
    type: u4
  - id: tag_size
    type: u4
  - id: data_checksum
    type: u4
  - id: tag_checksum
    type: u4
  - id: disk_encoding
    type: u1
    enum: disk_encodings
  - id: format_byte
    type: 
      switch-on: disk_encoding
      cases:
        'disk_encodings::gcr_ssdd': gcr_format_data
        'disk_encodings::gcr_dsdd': gcr_format_data
        'disk_encodings::mfm_dsdd': mfm_format_data
        'disk_encodings::mfm_dshd': mfm_format_data
  - id: magic
    contents: [0x01, 0x00]
  - id: image_data
    size: data_size
  - id: tag_data
    size: tag_size
enums:
  disk_encodings:
    0: gcr_ssdd
    1: gcr_dsdd
    2: mfm_dsdd
    3: mfm_dshd
types:
  mfm_format_data:
    seq:
      - id: unused
        type: b2
      - id: double_sided
        type: b1
      - id: sector_size
        type: b5
  gcr_format_data:
    seq:
      - id: unused
        type: b2
      - id: double_sided
        type: b1
      - id: interleave_factor
        type: b5
  pstring:
    seq:
      - id: len
        type: u1
      - id: value
        size: len
        type: str
        encoding: mac