mini_magick v5.0 supoort and marcel gem added

Gemfile.rails5_mini_magick

@@ -1,4 +1,4 @@
-# Copyright (c) 2011-2023 NAITOH Jun
+# Copyright (c) 2011-2025 NAITOH Jun
 # Released under the MIT license
 # http://www.opensource.org/licenses/MIT
 
@@ -8,5 +8,6 @@ source 'https://rubygems.org'
 gemspec
 
 gem "actionpack", "~> 5.2.8.1"
-gem "mini_magick", "< 5.0"
+gem "mini_magick"
+gem 'marcel'
 gem 'loofah', '<= 2.20.0' if RUBY_VERSION < '2.5'

Gemfile.rails6_mini_magick

@@ -9,4 +9,5 @@ gemspec
 
 gem "actionpack", "~> 6.1.7.2"
 gem "concurrent-ruby", '1.3.4'
-gem "mini_magick", "< 5.0"
+gem "mini_magick"
+gem 'marcel'

Gemfile.rails7_mini_magick

@@ -8,4 +8,5 @@ source 'https://rubygems.org'
 gemspec
 
 gem "actionpack", "~> 7.2.2.1"
-gem "mini_magick", "< 5.0"
+gem "mini_magick"
+gem 'marcel'

Gemfile.rails8_mini_magick

@@ -8,5 +8,5 @@ source 'https://rubygems.org'
 gemspec
 
 gem "actionpack", "~> 8.0.2"
-gem "mini_magick", "< 5.0"
-
+gem "mini_magick"
+gem 'marcel'

README.md

@@ -29,7 +29,7 @@ RBPDF is distributed via RubyGems, and can be installed the usual way that you i
 
 If you are using image file, it is recommended you install:
 ```
-gem install mini_magick
+gem install mini_magick marcel
 ```
 or
 ```

lib/core/mini_magick.rb

@@ -51,18 +51,27 @@ def getimagesize(filename)
       return false
     end
 
+    unless Object.const_defined?(:Marcel)
+      Error('No Marcel: Non-PNG file is not supported.: ' + filename);
+      return false
+    end
+
     image = MiniMagick::Image.open(filename)
 
     width = image.width
     height = image.height
 
-    out['mime'] = image.mime_type
+    mime_type = File.open filename do |file|
+      ::Marcel::MimeType.for file
+    end
+
+    out['mime'] = mime_type
     out[0] = width
     out[1] = height
 
     # These are actually meant to return integer values But I couldn't seem to find anything saying what those values are.
     # So for now they return strings. The only place that uses this at the moment is the parsejpeg method, so I've changed that too.
-    case image.mime_type
+    case mime_type
     when "image/gif"
       out[2] = "GIF"
     when "image/jpeg"

lib/rbpdf.rb

@@ -59,6 +59,12 @@
   # MiniMagick is not available
 end
 
+begin
+  require 'marcel' unless Object.const_defined?(:Marcel)
+rescue LoadError
+  # Marcel is not available
+end
+
 unless Object.const_defined?(:MiniMagick)
   begin
     # RMagick 2.14.0