Sha256: 9be81bd608b41e21825f4c2e3ad7f9294a3dfb36318f9a62fc9a4ad1962d2768
Contents?: true
Size: 713 Bytes
Versions: 5
Compression:
Stored size: 713 Bytes
Contents
require 'file_data/file_types/jpeg'
require_relative 'exif_stream'
module FileData
# Retrieves an ExifStream from a jpeg stream
class ExifJpeg
APP1_BYTES = [255, 225].freeze
EXIF_ID = "Exif\0\0".bytes.to_a.freeze
def initialize(stream)
@stream = stream
end
def exif
ExifStream.new(@stream) if seek_exif
end
private
def seek_exif
Jpeg.each_section(@stream)
.select { |section| exif_section?(section) }
.first
end
def exif_section?(section)
section.marker == APP1_BYTES && read_exif_id(section)
end
def read_exif_id(section)
section.content_stream.each_byte.take(EXIF_ID.size) == EXIF_ID
end
end
end
Version data entries
5 entries across 5 versions & 1 rubygems