Class: DynamicImage::ImageReader

Inherits:
Object
  • Object
show all
Defined in:
lib/dynamic_image/image_reader.rb

Instance Method Summary collapse

Constructor Details

#initialize(data) ⇒ ImageReader

Returns a new instance of ImageReader.



5
6
7
 
# File 'lib/dynamic_image/image_reader.rb', line 5

def initialize(data)
  @data = data
end

Instance Method Details

#read ⇒ Object

Raises:



9
10
11
12
 
# File 'lib/dynamic_image/image_reader.rb', line 9

def read
  raise DynamicImage::Errors::InvalidHeader unless valid_header?
  MiniMagick::Image.read(@data)
end

#valid_header? ⇒ Boolean

Returns:

  • (Boolean) 


14
15
16
17
18
19
20
21
22
 
# File 'lib/dynamic_image/image_reader.rb', line 14

def valid_header?
  magic_bytes.each do |expr|
    if (expr.is_a?(Regexp) && file_header =~ /^#{expr}/) ||
       (expr.is_a?(String) && file_header.start_with?(expr))
      return true
    end
  end
  false
end