Class: FormatParser::TIFFParser
- Inherits:
-
Object
- Object
- FormatParser::TIFFParser
show all
- Includes:
- EXIFParser, IOUtils
- Defined in:
- lib/parsers/tiff_parser.rb
Constant Summary
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- MAGIC_LE =
[0x49, 0x49, 0x2A, 0x0].pack('C4')
- MAGIC_BE =
[0x4D, 0x4D, 0x0, 0x2A].pack('C4')
[MAGIC_LE, MAGIC_BE]
- TIFF_MIME_TYPE =
'image/tiff'
Constants included
from EXIFParser
EXIFParser::ORIENTATIONS
Constants included
from IOUtils
IOUtils::INTEGER_DIRECTIVES
Instance Method Summary
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Methods included from EXIFParser
#exif_from_tiff_io
Methods included from IOUtils
#read_bytes, #read_fixed_point, #read_int, #safe_read, #safe_skip, #skip_bytes
Instance Method Details
#arw?(exif_data) ⇒ Boolean
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# File 'lib/parsers/tiff_parser.rb', line 56
def arw?(exif_data)
exif_data.compression == 6 && exif_data.new_subfile_type == 1 && exif_data.make&.start_with?('SONY')
end
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#call(io) ⇒ Object
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# File 'lib/parsers/tiff_parser.rb', line 14
def call(io)
io = FormatParser::IOConstraint.new(io)
return unless HEADER_BYTES.include?(safe_read(io, 4))
io.seek(io.pos + 2)
return if cr2?(io)
exif_data = exif_from_tiff_io(io)
return unless exif_data
return if arw?(exif_data)
w = exif_data.width || exif_data.pixel_x_dimension
h = exif_data.height || exif_data.pixel_y_dimension
FormatParser::Image.new(
format: :tif,
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: TIFF_MIME_TYPE,
)
rescue EXIFR::MalformedTIFF
nil
end
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#cr2?(io) ⇒ Boolean
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# File 'lib/parsers/tiff_parser.rb', line 49
def cr2?(io)
io.seek(8)
safe_read(io, 2) == 'CR'
end
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#likely_match?(filename) ⇒ Boolean
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# File 'lib/parsers/tiff_parser.rb', line 10
def likely_match?(filename)
filename =~ /\.tiff?$/i
end
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