meta:
  id: dat
  file-extension: dat
  endian: be
  # Derived from
  # https://web.archive.org/web/20090208111457/http://www.opera.com/docs/fileformats/
seq:
  - id: file_version_number
    type: u4
  - id: app_version_number
    type: u4
  - id: idtag_length
    # Asserted to always have a tag length of 1.
    contents: [0x00, 0x01]
  - id: length_length
    # Asserted to always have a length of 4.
    contents: [0x00, 0x04]
  - id: tags
    type: tag
    # repeat: eos

types:
  tag:
    seq:
      - id: tag_type
        type: u1
        enum: tag_types
      - id: tag_size
        type: u4
      - id: tag_contents
        type:
          switch-on: tag_type
          cases:
            'tag_types::ca_certificate': ca_tag

  # All of this should technically not be sequential, but it always is for our purposes.
  # If you wish to adapt this for other Opera usage, please adjust accordingly!
  ca_tag:
    seq:
      - id: cert_type_tag
        # 'tag_types::ssl_cert_type'
        contents: [0x20]
      - id: cert_type_length
        type: u4
      - id: cert_type
        type: u4
      - id: cert_name_tag
        contents: [0x21]
      - id: cert_name_length
        type: u4
      - id: cert_name
        type: str
        size: cert_name_length
        encoding: UTF-8
      - id: cert_subject_tag
        contents: [0x22]
      - id: cert_subject_length
        type: u4
      - id: cert_subject
        size: cert_subject_length
      - id: cert_contents_tag
        contents: [0x23]
      - id: cert_contents_length
        type: u4
      - id: cert_contents
        size: cert_contents_length

enums:
  tag_types:
    0x02: ca_certificate
    0x03: user_certificate
    0x04: user_password
    0x20: ssl_cert_type
    0x21: ssl_cert_name
    0x22: ssl_cert_subject