class FileData::ExifReader
Returns the exif data from a jpeg file
Public Class Methods
new(exif_stream)
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# File lib/file_data/formats/exif/exif_reader.rb, line 9 def initialize(exif_stream) @exif_stream = exif_stream end
Public Instance Methods
all_data()
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# File lib/file_data/formats/exif/exif_reader.rb, line 21 def all_data exif_tags_internal(0, 1) end
image_data_only()
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# File lib/file_data/formats/exif/exif_reader.rb, line 13 def image_data_only exif_tags_internal(0).image end
only_image_tag(tag_id)
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# File lib/file_data/formats/exif/exif_reader.rb, line 25 def only_image_tag(tag_id) exif_tag_internal(0, tag_id) end
only_thumbnail_tag(tag_id)
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# File lib/file_data/formats/exif/exif_reader.rb, line 29 def only_thumbnail_tag(tag_id) exif_tag_internal(1, tag_id) end
thumbnail_data_only()
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# File lib/file_data/formats/exif/exif_reader.rb, line 17 def thumbnail_data_only exif_tags_internal(1).thumbnail end
Private Instance Methods
exif_tag_internal(ifd_index, tag_to_find)
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# File lib/file_data/formats/exif/exif_reader.rb, line 48 def exif_tag_internal(ifd_index, tag_to_find) @exif_stream.read_tag_value if find_tag(ifd_index, tag_to_find) end
find_tag(ifd_index, tag_to_find)
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# File lib/file_data/formats/exif/exif_reader.rb, line 52 def find_tag(ifd_index, tag_to_find) tags(@exif_stream, ifd_index).find do |_, ifd_id, tag_num| tag_to_find == [ifd_id, tag_num] end end