Class: PropertyList::BinaryGenerator

Inherits:
Object
  • Object
show all
Includes:
BinaryMarkers
Defined in:
lib/property-list/binary_generator.rb

Overview

Modified from:

https://github.com/jarib/plist/blob/master/lib/plist/binary.rb

With improved performance

Constant Summary

Constants included from BinaryMarkers

PropertyList::BinaryMarkers::MARKER_ARRAY, PropertyList::BinaryMarkers::MARKER_ASCII_STRING, PropertyList::BinaryMarkers::MARKER_DATA, PropertyList::BinaryMarkers::MARKER_DATE, PropertyList::BinaryMarkers::MARKER_DICT, PropertyList::BinaryMarkers::MARKER_FALSE, PropertyList::BinaryMarkers::MARKER_FILL, PropertyList::BinaryMarkers::MARKER_INT, PropertyList::BinaryMarkers::MARKER_NO_BASE_URL, PropertyList::BinaryMarkers::MARKER_NULL, PropertyList::BinaryMarkers::MARKER_ORD_SET, PropertyList::BinaryMarkers::MARKER_REAL, PropertyList::BinaryMarkers::MARKER_SET, PropertyList::BinaryMarkers::MARKER_TRUE, PropertyList::BinaryMarkers::MARKER_UID, PropertyList::BinaryMarkers::MARKER_UTF16BE_STRING, PropertyList::BinaryMarkers::MARKER_UTF8_STRING, PropertyList::BinaryMarkers::MARKER_UUID, PropertyList::BinaryMarkers::MARKER_WITH_BASE_URL, PropertyList::BinaryMarkers::TIME_INTERVAL_SINCE_1970

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(opts) ⇒ BinaryGenerator

Returns a new instance of BinaryGenerator.



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# File 'lib/property-list/binary_generator.rb', line 18

def initialize opts
  @output = []
  @offset = 0
end

Instance Attribute Details

#output ⇒ Object (readonly)

Returns the value of attribute output.



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# File 'lib/property-list/binary_generator.rb', line 22

def output
  @output
end

Instance Method Details

#generate(object) ⇒ Object

Encodes obj as a binary property list. If obj is an Array, Hash, or Set, the property list includes its contents.



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# File 'lib/property-list/binary_generator.rb', line 26

def generate object
  flatten_objects = flatten_collection object
  ref_byte_size = min_byte_size flatten_objects.size - 1

  # Write header and encoded objects.
  # TODO use bplist10 when there are version 1x elements
  add_output "bplist00"
  offset_table = []
  flatten_objects.each do |o|
    offset_table << @offset
    binary_object o, ref_byte_size
  end

  # Write offset table.
  offset_table_addr = @offset
  offset_byte_size = min_byte_size @offset
  offset_table.each do |offset|
    binary_integer offset, offset_byte_size
  end

  # Write trailer. (6 + 2 + 24 = 32 bytes)
  add_output [
    "\0\0\0\0\0\0", # padding
    offset_byte_size, ref_byte_size,
    flatten_objects.size,
    0, # index of root object
    offset_table_addr
  ].pack("a*C2Q>3")
end