Sha256: 7379a496f59cf64e32d2bd0feea9897b39f5d13703f7c90e288d3d92a60e1580
Contents?: true
Size: 1.05 KB
Versions: 6
Compression:
Stored size: 1.05 KB
Contents
# frozen_string_literal: true
module DynamicImage
class ImageReader
class << self
def magic_bytes
@magic_bytes ||= [
"\x47\x49\x46\x38\x37\x61", # GIF
"\x47\x49\x46\x38\x39\x61",
"\x89\x50\x4e\x47\x0d\x0a\x1a\x0a", # PNG
"\xff\xd8", # JPEG
"\x49\x49\x2a\x00", # TIFF
"\x4d\x4d\x00\x2a",
"\x42\x4d", # BMP
"\x52\x49\x46\x46" # WEBP
].map { |s| s.dup.force_encoding("binary") }
end
end
def initialize(data)
@data = data
end
def read
raise DynamicImage::Errors::InvalidHeader unless valid_header?
MiniMagick::Image.read(@data)
end
def valid_header?
return false if file_header.blank?
self.class.magic_bytes.each do |str|
return true if file_header.start_with?(str)
end
false
end
private
def file_header
@file_header ||= StringIO.new(@data, "rb").read(8)
end
end
end
Version data entries
6 entries across 6 versions & 1 rubygems