Sha256: cd08a7a302881f9079b60b82d3b470f791fedc59957d4505cafca530b0d5d389
Contents?: true
Size: 1.73 KB
Versions: 9
Compression:
Stored size: 1.73 KB
Contents
require 'exifr/tiff'
require 'delegate'
module FormatParser::EXIFParser
ORIENTATIONS = [
:top_left,
:top_right,
:bottom_right,
:bottom_left,
:left_top,
:right_top,
:right_bottom,
:left_bottom
]
ROTATED_ORIENTATIONS = ORIENTATIONS - [
:bottom_left,
:bottom_right,
:top_left,
:top_right
]
module MethodsMethodFix
# Fix a little bug in EXIFR which breaks delegators
# https://github.com/remvee/exifr/pull/55
def methods(*)
super() # no args
end
end
EXIFR::TIFF.prepend(MethodsMethodFix)
# EXIFR kindly requests the presence of a few more methods than what our IOConstraint
# is willing to provide, but they can be derived from the available ones
class IOExt < SimpleDelegator
def readbyte
if byte = read(1)
byte.unpack('C').first
end
end
def seek(n, seek_mode = IO::SEEK_SET)
io = __getobj__
case seek_mode
when IO::SEEK_SET
io.seek(n)
when IO::SEEK_CUR
io.seek(io.pos + n)
when IO::SEEK_END
io.seek(io.size + n)
else
raise Errno::EINVAL
end
end
alias_method :getbyte, :readbyte
end
class EXIFResult < SimpleDelegator
def rotated?
ROTATED_ORIENTATIONS.include?(orientation)
end
def to_json(*maybe_coder)
__getobj__.to_hash.to_json(*maybe_coder)
end
def orientation
value = __getobj__.orientation.to_i
ORIENTATIONS.fetch(value - 1)
end
end
# Squash exifr's invalid date warning since we do not use that data.
EXIFR.logger = Logger.new(nil)
def exif_from_tiff_io(constrained_io)
raw_exif_data = EXIFR::TIFF.new(IOExt.new(constrained_io))
raw_exif_data ? EXIFResult.new(raw_exif_data) : nil
end
end
Version data entries
9 entries across 9 versions & 1 rubygems