Sha256: c1ee96a0efd2cd54d51403e883d71d62fdfa76875eca8b898b86efcb55258bc8
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Size: 1.29 KB
Versions: 35
Compression:
Stored size: 1.29 KB
Contents
require_relative 'exif_parser'
class FormatParser::CR2Parser
include FormatParser::IOUtils
include FormatParser::EXIFParser
TIFF_HEADER = [0x49, 0x49, 0x2a, 0x00]
CR2_HEADER = [0x43, 0x52, 0x02, 0x00]
CR2_MIME_TYPE = 'image/x-canon-cr2'
def likely_match?(filename)
filename =~ /\.cr2$/i
end
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
FormatParser.register_parser new, natures: :image, formats: :cr2
end
Version data entries
35 entries across 35 versions & 1 rubygems