Class: FormatParser::CR2Parser
- Inherits:
-
Object
- Object
- FormatParser::CR2Parser
- Includes:
- EXIFParser, IOUtils
- Defined in:
- lib/parsers/cr2_parser.rb
Constant Summary collapse
- TIFF_HEADER =
[0x49, 0x49, 0x2a, 0x00]
- CR2_HEADER =
[0x43, 0x52, 0x02, 0x00]
- CR2_MIME_TYPE =
'image/x-canon-cr2'
Constants included from EXIFParser
Instance Method Summary collapse
Methods included from EXIFParser
Methods included from IOUtils
Instance Method Details
#call(io) ⇒ Object
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# File 'lib/parsers/cr2_parser.rb', line 15 def call(io) io = FormatParser::IOConstraint.new(io) tiff_header = safe_read(io, 8) # Check whether it's a CR2 file tiff_bytes = tiff_header[0..3].bytes magic_bytes = safe_read(io, 4).unpack('C4') return if !magic_bytes.eql?(CR2_HEADER) || !tiff_bytes.eql?(TIFF_HEADER) # The TIFF scanner in EXIFR is plenty good enough, # so why don't we use it? It does all the right skips # in all the right places. exif_data = exif_from_tiff_io(io) return unless exif_data w = exif_data.image_width h = exif_data.image_length FormatParser::Image.new( format: :cr2, width_px: w, height_px: h, display_width_px: exif_data.rotated? ? h : w, display_height_px: exif_data.rotated? ? w : h, orientation: exif_data.orientation_sym, intrinsics: {exif: exif_data}, content_type: CR2_MIME_TYPE, ) rescue EXIFR::MalformedTIFF nil end |
#likely_match?(filename) ⇒ Boolean
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# File 'lib/parsers/cr2_parser.rb', line 11 def likely_match?(filename) filename =~ /\.cr2$/i end |