Highly Performant & Scalable Ultima Online Server Emulator
https://www.modernuo.com
c-sharpcsharpcsharp-coredotnetdotnet-coreemulatorgplgplv3mmommo-enginemmorpgmmorpg-serveronlinerpgrunuoserverservuoultimaultima-onlineuo
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## Summary - Adds proper Latin1 encoding support, replacing CP1252 usage throughout the codebase - Adds specialized, optimized string decoding methods with safe string filtering for each encoding type - Filters invalid Unicode characters (C0/C1 control codes, non-characters) by removal rather than replacement since the UO client renders nothing for these characters - Fixes UTF-16 null terminator position handling to correctly advance by 2 bytes ## Changes TextEncoding.cs - Added SearchValues-based invalid byte/char detection for efficient filtering - Added encoding-specific GetString methods: GetStringAscii, GetStringLatin1, GetStringUtf8, GetStringBigUni, GetStringLittleUni - Each method supports a safeString parameter for filtering invalid characters - Little-endian UTF-16 uses direct memory cast for zero-copy decoding on LE systems - Invalid characters are removed (not replaced with U+FFFD) since the client renders nothing for them SpanReader.cs - Added ReadLatin1() and ReadLatin1Safe() methods - Rewrote encoding-specific read methods to use optimized TextEncoding.GetString* methods - Fixed UTF-16 null terminator handling: position now correctly advances by byteLength (2) instead of 1 SpanWriter.cs - Added WriteLatin1 and WriteLatin1Null methods ## Packet Updates - Updated all packet code to use Latin1 encoding instead of CP1252 - Affected: account packets, equipment packets, menu packets, message packets, mobile packets, player packets, secure trade packets, vendor packets, gump packets, book packets, mahjong packets ## Filtering Behavior Invalid characters filtered in safe mode: ``` ┌───────────────┬────────────────────────┐ │ Range │ Description │ ├───────────────┼────────────────────────┤ │ 0x00-0x1F │ C0 control codes │ ├───────────────┼────────────────────────┤ │ 0x7F │ DEL │ ├───────────────┼────────────────────────┤ │ 0x80-0x9F │ C1 control codes │ ├───────────────┼────────────────────────┤ │ 0xFFFE-0xFFFF │ Unicode non-characters │ └───────────────┴────────────────────────┘ ``` Note: Surrogate pairs (0xD800-0xDFFF) are not filtered because proper validation requires context checking for paired vs unpaired surrogates. The UO client renders nothing for these anyway. ## Test Plan - All 631 Server.Tests pass - Verified client rendering behavior using TestUnicodeGump command (pages 1-5) - Confirmed U+FFFD, unpaired surrogates, and non-characters all render as blank in client - Verified Latin1 characters (0xA0-0xFF) display correctly - Verified C1 control codes (0x80-0x9F) are filtered and don't display |
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| .github | ||
| Distribution/Data | ||
| docs | ||
| Projects | ||
| .editorconfig | ||
| .gitattributes | ||
| .gitignore | ||
| azure-pipelines.yml | ||
| CODE_OF_CONDUCT.md | ||
| CONTRIBUTING.md | ||
| Directory.Build.props | ||
| FAQ.md | ||
| global.json | ||
| LICENSE | ||
| mkdocs.yml | ||
| ModernUO.sln | ||
| publish.cmd | ||
| publish.sh | ||
| README.md | ||
| rider-settings.zip | ||
| Rules.ruleset | ||
| SPONSORS.md | ||
| stylecop.json | ||
| THIRD-PARTY-NOTICES | ||
| version.json | ||
ModernUO 
Ultima Online Server Emulator for the modern era!
Requirements
Supported Operating Systems
Required Frameworks
All Operating Systems
Windows
Development
Supported IDEs
Getting Started
- Install prerequisite requirements
- Clone this repository (or download the latest):
git clone https://github.com/modernuo/ModernUO.git
- Open
ModernUO.slnto start developing
Building/Publishing
- Run
./publish.cmd [release|debug (default: release)] [os] [arch (default: x64)]os- Supported operating systemsarchx64- Intel/AMD 64-bitarm64- ARM 64-bit (Windows not supported)
Linux Prerequisites
Fedora, CentOS, RHEL, etc
dnf upgrade --refresh -y
# CentOS does not come with EPEL enabled
dnf install -y epel-release epel-next-release
dnf install -y findutils libicu libdeflate-devel zstd libargon2-devel
Ubuntu, Debian, etc
apt-get update -y
apt-get install -y libicu-dev libdeflate-dev zstd libargon2-dev
OSX Requirements
brew install icu4c libdeflate zstd argon2
Running the Server
- Follow the publish instructions
- Run
ModernUO.exeordotnet ModernUO.dllfrom theDistributiondirectory
Troubleshooting / FAQ
- See FAQ
Want to sponsor?
Thank you for supporting us! You can find out how by visiting the sponsors page.
Collaborators
Thanks
- RunUO Team & Community
- Voxpire, the ServUO Team & Community
- Karasho, Jaedan and the ClassicUO Community
Development Tools & Plugins provided with ♥ by
