Class: AppInfo::PngUncrush

Inherits:
Object show all
Defined in:
lib/app_info/png_uncrush.rb

Defined Under Namespace

Classes: Error, FormatError, PngReader

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(filename) ⇒ PngUncrush

Returns a new instance of PngUncrush.

Raises:



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# File 'lib/app_info/png_uncrush.rb', line 71

def initialize(filename)
  @io = PngReader.new(File.open(filename))
  raise FormatError, 'not a png file' unless @io.png?
end

Class Method Details

.decompress(input, output) ⇒ Object 



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# File 'lib/app_info/png_uncrush.rb', line 63

def self.decompress(input, output)
  new(input).decompress(output)
end

.dimensions(input) ⇒ Object 



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# File 'lib/app_info/png_uncrush.rb', line 67

def self.dimensions(input)
  new(input).dimensions
end

Instance Method Details

#decompress(output) ⇒ Object 



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# File 'lib/app_info/png_uncrush.rb', line 80

def decompress(output)
  content = _remap(_dump_sections)
  return false unless content

  write_file(output, content)
rescue Zlib::DataError
  # perhops thi is a normal png image file
  false
end

#dimensions ⇒ Object 



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# File 'lib/app_info/png_uncrush.rb', line 76

def dimensions
  _dump_sections(dimensions: true)
end