DCX is a simple extension of PCX image format allowing to bundle many PCX images (typically, pages of a document) in one file. It saw some limited use in DOS-era fax software, but was largely superseded with multi-page TIFFs and PDFs since then.
This page hosts a formal specification of .dcx file format using Kaitai Struct. This specification can be automatically translated into a variety of programming languages to get a parsing library.
All parsing code for Ruby generated by Kaitai Struct depends on the Ruby runtime library. You have to install it before you can parse data.
The Ruby runtime library can be installed from RubyGems:
gem install kaitai-structParse a local file and get structure in memory:
data = PcxDcx.from_file("path/to/local/file.dcx")
Or parse structure from a string of bytes:
bytes = "\x00\x01\x02..."
data = PcxDcx.new(Kaitai::Struct::Stream.new(bytes))
After that, one can get various attributes from the structure by invoking getter methods like:
data.magic # => get magic
# This is a generated file! Please edit source .ksy file and use kaitai-struct-compiler to rebuild
require 'kaitai/struct/struct'
unless Gem::Version.new(Kaitai::Struct::VERSION) >= Gem::Version.new('0.9')
raise "Incompatible Kaitai Struct Ruby API: 0.9 or later is required, but you have #{Kaitai::Struct::VERSION}"
end
##
# DCX is a simple extension of PCX image format allowing to bundle
# many PCX images (typically, pages of a document) in one file. It saw
# some limited use in DOS-era fax software, but was largely
# superseded with multi-page TIFFs and PDFs since then.
class PcxDcx < Kaitai::Struct::Struct
def initialize(_io, _parent = nil, _root = self)
super(_io, _parent, _root)
_read
end
def _read
@magic = @_io.read_bytes(4)
raise Kaitai::Struct::ValidationNotEqualError.new([177, 104, 222, 58].pack('C*'), magic, _io, "/seq/0") if not magic == [177, 104, 222, 58].pack('C*')
@files = []
i = 0
begin
_ = PcxOffset.new(@_io, self, @_root)
@files << _
i += 1
end until _.ofs_body == 0
self
end
class PcxOffset < Kaitai::Struct::Struct
def initialize(_io, _parent = nil, _root = self)
super(_io, _parent, _root)
_read
end
def _read
@ofs_body = @_io.read_u4le
self
end
def body
return @body unless @body.nil?
if ofs_body != 0
_pos = @_io.pos
@_io.seek(ofs_body)
@body = Pcx.new(@_io)
@_io.seek(_pos)
end
@body
end
attr_reader :ofs_body
end
attr_reader :magic
attr_reader :files
end