class CFPropertyList::Binary

def array_to_binary(val)
  saved_object_count = @written_object_count
  @written_object_count += 1
  #@object_refs += val.value.size
  values = val.value.map { |v| v.to_binary(self) }
  bdata = Binary.type_bytes(0b1010, val.value.size) <<
    Binary.pack_int_array_with_size(object_ref_size(@object_refs),
                                    values)
  @object_table[saved_object_count] = bdata
  saved_object_count
end

def bool_to_binary(val)
  @object_table[@written_object_count] = val ? "\x9" : "\x8" # 0x9 is 1001, type indicator for true; 0x8 is 1000, type indicator for false
  @written_object_count += 1
  @written_object_count - 1
end

def count_object_refs(object)
  case object
  when CFArray
    contained_refs = 0
    object.value.each do |element|
      if CFArray === element || CFDictionary === element
        contained_refs += count_object_refs(element)
      end
    end
    return object.value.size + contained_refs
  when CFDictionary
    contained_refs = 0
    object.value.each_value do |value|
      if CFArray === value || CFDictionary === value
        contained_refs += count_object_refs(value)
      end
    end
    return object.value.keys.size * 2 + contained_refs
  else
    return 0
  end
end

def data_to_binary(val)
  @object_table[@written_object_count] =
    (Binary.type_bytes(0b0100, val.bytesize) << val)
  @written_object_count += 1
  @written_object_count - 1
end

def date_to_binary(val)
  val = val.getutc.to_f - CFDate::DATE_DIFF_APPLE_UNIX # CFDate is a real, number of seconds since 01/01/2001 00:00:00 GMT
  @object_table[@written_object_count] =
    (Binary.type_bytes(0b0011, 3) << [val].pack("E").reverse)
  @written_object_count += 1
  @written_object_count - 1
end

def dict_to_binary(val)
  saved_object_count = @written_object_count
  @written_object_count += 1
  #@object_refs += val.value.keys.size * 2
  keys_and_values = val.value.keys.map { |k| CFString.new(k).to_binary(self) }
  keys_and_values.concat(val.value.values.map { |v| v.to_binary(self) })
  bdata = Binary.type_bytes(0b1101,val.value.size) <<
    Binary.pack_int_array_with_size(object_ref_size(@object_refs), keys_and_values)
  @object_table[saved_object_count] = bdata
  return saved_object_count
end

def int_to_binary(value)
  nbytes = 0
  nbytes = 1  if value > 0xFF # 1 byte integer
  nbytes += 1 if value > 0xFFFF # 4 byte integer
  nbytes += 1 if value > 0xFFFFFFFF # 8 byte integer
  nbytes = 3  if value < 0 # 8 byte integer, since signed
  Binary.type_bytes(0b0001, nbytes) <<
    if nbytes < 3
      [value].pack(
        if nbytes == 0    then "C"
        elsif nbytes == 1 then "n"
        else "N"
        end
      )
    else
      # 64 bit signed integer; we need the higher and the lower 32 bit of the value
      high_word = value >> 32
      low_word = value & 0xFFFFFFFF
      [high_word,low_word].pack("NN")
    end
end

def load(opts)
  @unique_table = {}
  @count_objects = 0
  @object_refs = 0
  @written_object_count = 0
  @object_table = []
  @object_ref_size = 0
  @offsets = []
  fd = nil
  if(opts.has_key?(:file))
    fd = File.open(opts[:file],"rb")
    file = opts[:file]
  else
    fd = StringIO.new(opts[:data],"rb")
    file = "<string>"
  end
  # first, we read the trailer: 32 byte from the end
  fd.seek(-32,IO::SEEK_END)
  buff = fd.read(32)
  offset_size, object_ref_size, number_of_objects, top_object, table_offset = buff.unpack "x6CCx4Nx4Nx4N"
  # after that, get the offset table
  fd.seek(table_offset, IO::SEEK_SET)
  coded_offset_table = fd.read(number_of_objects * offset_size)
  raise CFFormatError.new("#{file}: Format error!") unless coded_offset_table.bytesize == number_of_objects * offset_size
  @count_objects = number_of_objects
  # decode offset table
  if(offset_size != 3)
    formats = ["","C*","n*","","N*"]
    @offsets = coded_offset_table.unpack(formats[offset_size])
  else
    @offsets = coded_offset_table.unpack("C*").each_slice(3).map {
      |x,y,z| (x << 16) | (y << 8) | z
    }
  end
  @object_ref_size = object_ref_size
  val = read_binary_object_at(file,fd,top_object)
  fd.close
  val
end

def num_to_binary(value)
  @object_table[@written_object_count] =
    if value.is_a?(CFInteger)
      int_to_binary(value.value)
    else
      real_to_binary(value.value)
    end
  @written_object_count += 1
  @written_object_count - 1
end

def object_ref_size object_refs
  Binary.bytes_needed(object_refs)
end

def read_binary_array(fname,fd,length)
  ary = []
  # first: read object refs
  if(length != 0)
    buff = fd.read(length * @object_ref_size)
    objects = unpack_with_size(@object_ref_size, buff) #buff.unpack(@object_ref_size == 1 ? "C*" : "n*")
    # now: read objects
    0.upto(length-1) do |i|
      object = read_binary_object_at(fname,fd,objects[i])
      ary.push object
    end
  end
  CFArray.new(ary)
end

def read_binary_data(fname,fd,length)
  CFData.new(read_fd(fd, length), CFData::DATA_RAW)
end

def read_binary_date(fname,fd,length)
  raise CFFormatError.new("Date greater than 8 bytes: #{length}") if length > 3
  nbytes = 1 << length
  buff = fd.read(nbytes)
  CFDate.new(
    case length
    when 0 then # 1 byte CFDate is an error
      raise CFFormatError.new("#{length+1} byte CFDate, error")
    when 1 then # 2 byte CFDate is an error
      raise CFFormatError.new("#{length+1} byte CFDate, error")
    when 2 then
      buff.reverse.unpack("e")[0]
    when 3 then
      buff.reverse.unpack("E")[0]
    end,
    CFDate::TIMESTAMP_APPLE
  )
end

def read_binary_dict(fname,fd,length)
  dict = {}
  # first: read keys
  if(length != 0) then
    buff = fd.read(length * @object_ref_size)
    keys = unpack_with_size(@object_ref_size, buff)
    # second: read object refs
    buff = fd.read(length * @object_ref_size)
    objects = unpack_with_size(@object_ref_size, buff)
    # read real keys and objects
    0.upto(length-1) do |i|
      key = read_binary_object_at(fname,fd,keys[i])
      object = read_binary_object_at(fname,fd,objects[i])
      dict[key.value] = object
    end
  end
  CFDictionary.new(dict)
end

def read_binary_int(fname,fd,length)
  if length > 3
    raise CFFormatError.new("Integer greater than 8 bytes: #{length}")
  end
  nbytes = 1 << length
  buff = fd.read(nbytes)
  CFInteger.new(
    case length
    when 0 then buff.unpack("C")[0]
    when 1 then buff.unpack("n")[0]
    when 2 then buff.unpack("N")[0]
    when 3
      hiword,loword = buff.unpack("NN")
      if (hiword & 0x80000000) != 0
        # 8 byte integers are always signed, and are negative when bit 63 is
        # set. Decoding into either a Fixnum or Bignum is tricky, however,
        # because the size of a Fixnum varies among systems, and Ruby
        # doesn't consider the number to be negative, and won't sign extend.
        -(2**63 - ((hiword & 0x7fffffff) << 32 | loword))
      else
        hiword << 32 | loword
      end
    end
  )
end

def read_binary_null_type(length)
  case length
  when 0  then 0 # null byte
  when 8  then CFBoolean.new(false)
  when 9  then CFBoolean.new(true)
  when 15 then 15 # fill type
  else
    raise CFFormatError.new("unknown null type: #{length}")
  end
end

def read_binary_object(fname,fd)
  # first: read the marker byte
  buff = fd.read(1)
  object_length = buff.unpack("C*")
  object_length = object_length[0] & 0xF
  buff = buff.unpack("H*")
  object_type = buff[0][0].chr
  if(object_type != "0" && object_length == 15) then
    object_length = read_binary_object(fname,fd)
    object_length = object_length.value
  end
  case object_type
  when '0' # null, false, true, fillbyte
    read_binary_null_type(object_length)
  when '1' # integer
    read_binary_int(fname,fd,object_length)
  when '2' # real
    read_binary_real(fname,fd,object_length)
  when '3' # date
    read_binary_date(fname,fd,object_length)
  when '4' # data
    read_binary_data(fname,fd,object_length)
  when '5' # byte string, usually utf8 encoded
    read_binary_string(fname,fd,object_length)
  when '6' # unicode string (utf16be)
    read_binary_unicode_string(fname,fd,object_length)
  when '8'
    CFUid.new(read_binary_int(fname, fd, object_length).value)
  when 'a' # array
    read_binary_array(fname,fd,object_length)
  when 'd' # dictionary
    read_binary_dict(fname,fd,object_length)
  end
end

def read_binary_object_at(fname,fd,pos)
  position = @offsets[pos]
  fd.seek(position,IO::SEEK_SET)
  read_binary_object(fname,fd)
end

def read_binary_real(fname,fd,length)
  raise CFFormatError.new("Real greater than 8 bytes: #{length}") if length > 3
  nbytes = 1 << length
  buff = fd.read(nbytes)
  CFReal.new(
    case length
    when 0 # 1 byte float? must be an error
      raise CFFormatError.new("got #{length+1} byte float, must be an error!")
    when 1 # 2 byte float? must be an error
      raise CFFormatError.new("got #{length+1} byte float, must be an error!")
    when 2 then
      buff.reverse.unpack("e")[0]
    when 3 then
      buff.reverse.unpack("E")[0]
    else
      fail "unexpected length: #{length}"
    end
  )
end

def read_binary_string(fname,fd,length)
  buff = read_fd fd, length
  @unique_table[buff] = true unless @unique_table.has_key?(buff)
  CFString.new(buff)
end

def read_binary_unicode_string(fname,fd,length)
  # The problem is: we get the length of the string IN CHARACTERS;
  # since a char in UTF-16 can be 16 or 32 bit long, we don't really know
  # how long the string is in bytes
  buff = fd.read(2*length)
  @unique_table[buff] = true unless @unique_table.has_key?(buff)
  CFString.new(Binary.charset_convert(buff,"UTF-16BE","UTF-8"))
end

def read_fd fd, length
  length > 0 ? fd.read(length) : ""
end

def real_to_binary(val)
  Binary.type_bytes(0b0010,3) << [val].pack("E").reverse
end

def string_to_binary(val)
  val = val.to_s
  @unique_table[val] ||= begin
    if !Binary.ascii_string?(val)
      val = Binary.charset_convert(val,"UTF-8","UTF-16BE")
      bdata = Binary.type_bytes(0b0110, Binary.charset_strlen(val,"UTF-16BE"))
      val.force_encoding("ASCII-8BIT") if val.respond_to?("encode")
      @object_table[@written_object_count] = bdata << val
    else
      bdata = Binary.type_bytes(0b0101,val.bytesize)
      @object_table[@written_object_count] = bdata << val
    end
    @written_object_count += 1
    @written_object_count - 1
  end
end

def to_str(opts={})
  @unique_table = {}
  @count_objects = 0
  @object_refs = 0
  @written_object_count = 0
  @object_table = []
  @offsets = []
  binary_str = "bplist00"
  @object_refs = count_object_refs(opts[:root])
  opts[:root].to_binary(self)
  next_offset = 8
  offsets = @object_table.map do |object|
    offset = next_offset
    next_offset += object.bytesize
    offset
  end
  binary_str << @object_table.join
  table_offset = next_offset
  offset_size = Binary.bytes_needed(table_offset)
  if offset_size < 8
    # Fast path: encode the entire offset array at once.
    binary_str << offsets.pack((%w(C n N N)[offset_size - 1]) + '*')
  else
    # Slow path: host may be little or big endian, must pack each offset
    # separately.
    offsets.each do |offset|
      binary_str << "#{Binary.pack_it_with_size(offset_size,offset)}"
    end
  end
  binary_str << [offset_size, object_ref_size(@object_refs)].pack("x6CC")
  binary_str << [@object_table.size].pack("x4N")
  binary_str << [0].pack("x4N")
  binary_str << [table_offset].pack("x4N")
  binary_str
end

def uid_to_binary(value)
  nbytes = 0
  nbytes = 1  if value > 0xFF # 1 byte integer
  nbytes += 1 if value > 0xFFFF # 4 byte integer
  nbytes += 1 if value > 0xFFFFFFFF # 8 byte integer
  nbytes = 3  if value < 0 # 8 byte integer, since signed
  @object_table[@written_object_count] = Binary.type_bytes(0b1000, nbytes) <<
    if nbytes < 3
      [value].pack(
        if nbytes == 0    then "C"
        elsif nbytes == 1 then "n"
        else "N"
        end
      )
    else
      # 64 bit signed integer; we need the higher and the lower 32 bit of the value
      high_word = value >> 32
      low_word = value & 0xFFFFFFFF
      [high_word,low_word].pack("NN")
    end
  @written_object_count += 1
  @written_object_count - 1
end

def unpack_with_size(nbytes, buff)
  format = ["C*", "n*", "N*", "N*"][nbytes - 1];
  if nbytes == 3
    buff = "\0" + buff.scan(/.{1,3}/).join("\0")
  end
  return buff.unpack(format)
end