Release version 2.0.0

.gitattributes

@@ -0,0 +1,2 @@
+/lib/db/*.db text eol=lf
+/test/fixtures/*.db text eol=lf

.github/workflows/ci.yml

@@ -7,42 +7,44 @@ on:
       - main
 
 jobs:
-  build:
-    runs-on: ${{ matrix.os }}-latest
-    name: "Ruby ${{ matrix.ruby }} / ${{ matrix.os }} / Failure allowed: ${{ matrix.experimental }}"
-    continue-on-error: ${{ matrix.experimental }}
-    timeout-minutes: 5
+  test:
+    runs-on: ${{ matrix.os }}
+    name: "${{ matrix.ruby }} / ${{ matrix.os }}"
+    timeout-minutes: 10
 
     strategy:
       fail-fast: false
       matrix:
-        os: ["ubuntu"]
-        ruby: ["3.1", "3.2"]
-        experimental: [false]
+        os: [ubuntu-24.04]
+        ruby:
+          - "3.3"
+          - "3.4"
+          - "4.0"
+          - "jruby-10.0"
+          - "jruby-10.1"
+          - "truffleruby-34.0"
         include:
-          - ruby: "3.2"
-            os: "windows"
-            experimental: false
-          - ruby: "ruby-head"
-            os: "ubuntu"
-            experimental: true
-          - ruby: "truffleruby-head"
-            os: "ubuntu"
-            experimental: true
-          - ruby: "jruby-head"
-            os: "ubuntu"
-            experimental: true
-          - ruby: "jruby-9.4.0.0"
-            os: "ubuntu"
-            experimental: true
+          - ruby: "4.0"
+            os: windows-2025
+
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v6
       - uses: ruby/setup-ruby@v1
         with:
           ruby-version: ${{ matrix.ruby }}
           bundler-cache: true
-      - name: Rubocop
-        run: bundle exec rubocop
-        if: "!contains(matrix.ruby, 'jruby')"
       - name: Tests
         run: bundle exec rake test
+
+  lint:
+    runs-on: ubuntu-24.04
+    timeout-minutes: 5
+
+    steps:
+      - uses: actions/checkout@v6
+      - uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: "4.0"
+          bundler-cache: true
+      - name: Rubocop
+        run: bundle exec rubocop

.github/workflows/db.yml

@@ -6,21 +6,27 @@ on:
     - cron: "0 10 1 * *"
   workflow_dispatch:
 
+permissions:
+  contents: write
+  pull-requests: write
+
 jobs:
   update_db:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-24.04
     name: "Update MIME type DB"
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v6
       - uses: ruby/setup-ruby@v1
         with:
-          ruby-version: "2.7"
+          ruby-version: "4.0"
           bundler-cache: true
       - name: Update mime-types-data
         run: bundle update mime-types-data
       - name: Update DB
         run: bundle exec rake rebuild_db
+      - name: Test updated DB
+        run: bundle exec rake test
       - name: Create PR
         run: bin/db_pull_request
         env:
-          GITHUB_TOKEN: ${{secrets.GITHUB_TOKEN}}
+          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}

.gitignore

@@ -1,6 +1,7 @@
 /.bundle/
 /.yardoc
 /Gemfile.lock
+/mise.toml
 /_yardoc/
 /coverage/
 /doc/

.ruby-version

@@ -0,0 +1 @@
+4.0.6

CHANGELOG

@@ -1,3 +1,13 @@
+02-09-2026
+  - Version 2.0.0
+  - Require Ruby 3.3 or newer
+  - Update the bundled MIME database from mime-types-data 3.2026.0701; some extension and content-type mappings changed to match current upstream priorities
+  - Use byte offsets for reliable lookups in Unicode custom databases (#65, thanks @OskarEichler)
+  - Avoid duplicate database reads for lowercase extension misses (#64, thanks @OskarEichler)
+  - Preserve preferred extensions and extension-specific priorities when rebuilding the database (#66, thanks @OskarEichler)
+  - Reload custom MIME databases when their configured paths change
+  - Validate custom database row widths, row structure, and UTF-8 encoding
+
 08-08-2023
   - Version 1.1.5
   - Update mime types from upstream

Gemfile

@@ -4,6 +4,8 @@ source 'https://rubygems.org'
 # Specify your gem's dependencies in mini_mime.gemspec
 gemspec
 
-gem "mime-types", "~> 3" if RUBY_VERSION > '2'
+gem "mime-types", "~> 3.7.0"
 gem "memory_profiler"
 gem "benchmark-ips"
+gem "rubocop", platforms: :mri
+gem "rubocop-discourse", platforms: :mri

README.md

@@ -4,6 +4,8 @@ Minimal mime type implementation for use with the mail and rest-client gem.
 
 ## Installation
 
+MiniMime 2.0 requires Ruby 3.3 or newer. Supported JRuby and TruffleRuby releases must implement a maintained Ruby language version.
+
 Add this line to your application's Gemfile:
 
 ```ruby
@@ -46,6 +48,8 @@ MiniMime::Configuration.ext_db_path = "path_to_file_extension_db"
 MiniMime::Configuration.content_type_db_path = "path_to_content_type_db"
 ```
 
+Configuration is process-global and should normally be set during application startup. Changing either path resets the lookup database so subsequent lookups use the new files. Custom databases must contain UTF-8 rows with three whitespace-separated columns, a final newline, and a consistent byte width.
+
 Check out the [default databases](lib/db) for proper formatting and structure hints.
 
 ## Performance

Rakefile

@@ -16,15 +16,15 @@ def pad(array)
   array.each do |row|
     i = 0
     row.each do |col|
-      max[i] = [max[i] || 0, col.length].max
+      max[i] = [max[i] || 0, col.bytesize].max
       i += 1
     end
   end
 
   array.each do |row|
     i = 0
     row.each do |col|
-      col << " " * (max[i] - col.length)
+      col << " " * (max[i] - col.bytesize)
       i += 1
     end
   end
@@ -36,13 +36,14 @@ task :rebuild_db do
   puts "Generating mime type DB"
   require 'mime/types'
   index = {}
+  preferred_extensions = {}
 
   MIME::Types.each do |type|
     type.extensions.each { |ext| (index[ext.downcase] ||= []) << type }
   end
 
-  index.each do |k, list|
-    list.sort! { |a, b| a.priority_compare(b) }
+  index.each do |extension, list|
+    list.sort! { |a, b| a.__extension_priority_compare(b, [extension]) }
   end
 
   buffer = []
@@ -51,14 +52,15 @@ task :rebuild_db do
     mime_type = list.detect { |t| !t.obsolete? }
     mime_type ||= list.detect(&:registered)
     mime_type ||= list.first
+    preferred_extensions[mime_type.content_type] ||= mime_type.preferred_extension
     buffer << [ext.dup, mime_type.content_type.dup, mime_type.encoding.dup]
   end
 
   pad(buffer)
 
   buffer.sort! { |a, b| a[0] <=> b[0] }
 
-  File.open("lib/db/ext_mime.db", File::CREAT | File::TRUNC | File::RDWR) do |f|
+  File.open("lib/db/ext_mime.db", File::BINARY | File::CREAT | File::TRUNC | File::RDWR) do |f|
     buffer.each do |row|
       f.write "#{row[0]} #{row[1]} #{row[2]}\n"
     end
@@ -77,12 +79,12 @@ task :rebuild_db do
 
   # we got to confirm we pick the right extension for each type
   buffer.each do |row|
-    row[0] = MIME::Types.type_for("xyz.#{row[0].strip}")[0].extensions[0].dup
+    row[0] = preferred_extensions.fetch(row[1]).dup
   end
 
   pad(buffer)
 
-  File.open("lib/db/content_type_mime.db", File::CREAT | File::TRUNC | File::RDWR) do |f|
+  File.open("lib/db/content_type_mime.db", File::BINARY | File::CREAT | File::TRUNC | File::RDWR) do |f|
     last = nil
     count = 0
     buffer.each do |row|