Class: GBTiles::GBM::Import::GBMFile

Inherits:
Object
  • Object
show all
Defined in:
lib/gbtiles/gbm/import/gbm_file.rb

Constant Summary collapse

OBJECT_MARKER = 
"HPJMTL"

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ GBMFile

Returns a new instance of GBMFile.



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# File 'lib/gbtiles/gbm/import/gbm_file.rb', line 25

def initialize
  @map_set = GBTiles::GBM::Map::MapSet.new
end

Instance Attribute Details

#map_set ⇒ Object

Returns the value of attribute map_set.



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# File 'lib/gbtiles/gbm/import/gbm_file.rb', line 23

def map_set
  @map_set
end

#version ⇒ Object

Returns the value of attribute version.



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# File 'lib/gbtiles/gbm/import/gbm_file.rb', line 22

def version
  @version
end

Class Method Details

.open(file) ⇒ Object 



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# File 'lib/gbtiles/gbm/import/gbm_file.rb', line 29

def self.open file
  import = GBTiles::GBM::Import::GBMFile.new

  # Check to see if this is a valid file type
  if (file.read(3) != "GBO") then
    raise IOError, "Not a valid file (expected: GBO)"
  end

  # Version number
  import.version = file.read(1)

  if import.version != "1" then
    raise IOError, "Cannot import version #{import.version}"
  end

  # For each object
  while !file.eof?
    # Check the marker
    marker = GBTiles::DataType.string(file.read(6))

    if !OBJECT_MARKER.eql? marker then
      raise "Malformed file, expected marker #{OBJECT_MARKER}, got #{marker}"
    end

    object_type = GBTiles::DataType.word(file.read(2))
    object_id   = GBTiles::DataType.word(file.read(2))
    master_id   = GBTiles::DataType.word(file.read(2))
    object_crc  = GBTiles::DataType.long(file.read(4))
    object_len  = GBTiles::DataType.long(file.read(4))
    object_data = file.read(object_len)

    case GBTiles::GBM::Map::OBJECT_TYPE.key(object_type)
    when :producer
      object = GBTiles::GBM::Map::Objects::Producer.initFromBitString object_data

    when :map
      object = GBTiles::GBM::Map::Objects::Map.initFromBitString object_data

    when :map_tile_data
      object = GBTiles::GBM::Map::Objects::MapTileData.initFromBitString object_data

    when :map_settings
      object = GBTiles::GBM::Map::Objects::MapSettings.initFromBitString object_data

    when :map_export_settings
      object = GBTiles::GBM::Map::Objects::MapExportSettings.initFromBitString object_data

    else
      object = GBTiles::GBM::Map::Objects::Unknown.new object_type
      object.object_data = object_data

    end

    object.object_id = object_id
    object.master_id = master_id

    import.map_set.objects << object
  end

  import
end