Modern open-source C# .NET 10 Asheron's Call client. Faithful port of retail client behaviour to Silk.NET with a plugin API.
293584d6e8
First step of Phase 4 (networking). Adds a new AcDream.Core.Net project
for the AC UDP protocol implementation and a matching AcDream.Core.Net.Tests
project. Keeps networking isolated from rendering and the dat layer,
which also keeps the AGPL-reference-material hygiene cleaner.
AcDream.Core.Net/NOTICE.md documents the attribution policy: we read
ACE's AGPL network code (and holtburger's Rust ac-protocol crate) to
understand AC's wire format, but we reimplement everything in acdream's
own style. Wire-format facts aren't copyrightable; specific code is.
This commit adds one component: IsaacRandom — AC's variant of Bob
Jenkins' ISAAC PRNG, used to XOR a keystream into the CRC field of
every outbound packet for authentication. Clean-room reimplementation
based on reading:
- references/ACE/Source/ACE.Common/Cryptography/ISAAC.cs (AGPL oracle)
- Bob Jenkins' public ISAAC algorithm description
Implementation notes:
- 256 uint32 mm[] state, 256 uint32 rsl[] output buffer, a/b/c regs
- Initialize() runs 4 golden-ratio Mix() warmup rounds then two fold-in
passes over rsl[] and mm[] (fresh instance → both start as zeroes)
- AC variant: seed is exactly 4 bytes, interpreted as little-endian
uint32 assigned to a = b = c before the first Scramble()
- Scramble() produces 256 output words in one pass; Next() consumes
them backwards from offset 255 → 0, re-scrambling at offset -1
- Test seed 0x12345678 matches ACE's reference output byte-for-byte
across the first 16 values (golden vectors transcribed from a
throwaway oracle harness that compiled ACE's ISAAC.cs and printed
its output; the harness was deleted after extracting the values)
Tests (5, all passing):
- Next_Seed12345678_MatchesAceGoldenVectors: 16 golden uint32 values
- Next_TwoInstancesSameSeed_ProduceIdenticalSequence: 1000 outputs
- Next_DifferentSeeds_ProduceDifferentFirstOutput
- Next_512Calls_SpansTwoScrambleBatches: >400 distinct values in 512
outputs (catches all-zero / stuck-at-one bugs at scramble boundary)
- Ctor_ShortSeed_Throws
Both test projects still green: 77 core + 5 net = 82/82.
Phase 4.2 (packet framing + checksum) next.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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| docs/plans | ||
| src | ||
| tests | ||
| .gitignore | ||
| AcDream.slnx | ||
| CLAUDE.md | ||
| README.md | ||
acdream
Experimental modern open-source Asheron's Call client in C# / .NET 10.
Status: pre-alpha, not playable. Phase 0 only — dat file asset inventory.
Stack: .NET 10, Chorizite.DatReaderWriter for dat parsing. Silk.NET + Avalonia planned for rendering/UI (not yet wired up).
Requires: A retail Asheron's Call install (Turbine/Microsoft property — supply your own). Set ACDREAM_DAT_DIR environment variable to the directory containing client_portal.dat, client_cell_1.dat, client_highres.dat, and client_local_English.dat, or pass it as the first CLI argument.
Layout
src/AcDream.Cli/— console app that dumps asset counts from a dat directoryreferences/— local read-only reference material (ACE, ACViewer, WorldBuilder, DatReaderWriter, holtburger, retail AC install). Gitignored.
Run
dotnet run --project src/AcDream.Cli -- "C:\path\to\Asheron's Call"
Or set ACDREAM_DAT_DIR and run without args.