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<?xml version="1.0" encoding="UTF-8"?>
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<Project Sdk="Microsoft.NET.Sdk">
<PropertyGroup>
<OutputType>Exe</OutputType>
<TargetFramework>net8.0</TargetFramework>
<RootNamespace>CHUNITHM_Patch_Finder</RootNamespace>
<ImplicitUsings>enable</ImplicitUsings>
<Nullable>enable</Nullable>
</PropertyGroup>
<ItemGroup>
<PackageReference Include="Reloaded.Memory.Sigscan" Version="3.1.8" />
<PackageReference Include="YamlDotNet" Version="15.1.2" />
</ItemGroup>
<ItemGroup>
<ContentWithTargetPath Include="patterns.yaml">
<CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
<TargetPath>%(Filename)%(Extension)</TargetPath>
</ContentWithTargetPath>
</ItemGroup>
</Project>

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Microsoft Visual Studio Solution File, Format Version 12.00
Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "CHUNITHM-Patch-Finder", "CHUNITHM-Patch-Finder.csproj", "{C5CCAA87-16B3-415F-824A-B7C95E645EE1}"
EndProject
Global
GlobalSection(SolutionConfigurationPlatforms) = preSolution
Debug|Any CPU = Debug|Any CPU
Release|Any CPU = Release|Any CPU
EndGlobalSection
GlobalSection(ProjectConfigurationPlatforms) = postSolution
{C5CCAA87-16B3-415F-824A-B7C95E645EE1}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
{C5CCAA87-16B3-415F-824A-B7C95E645EE1}.Debug|Any CPU.Build.0 = Debug|Any CPU
{C5CCAA87-16B3-415F-824A-B7C95E645EE1}.Release|Any CPU.ActiveCfg = Release|Any CPU
{C5CCAA87-16B3-415F-824A-B7C95E645EE1}.Release|Any CPU.Build.0 = Release|Any CPU
EndGlobalSection
EndGlobal

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namespace CHUNITHM_Patch_Finder;
public record Pattern
{
public required string Name;
public string? Signature = null;
public required PatternPatch[] Patches;
public string? Tooltip = null;
public string? Danger = null;
}

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namespace CHUNITHM_Patch_Finder;
public record PatternPatch
{
public string? Signature = null;
public required int Offset;
public required int[] Off;
public required int[] On;
}

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// See https://aka.ms/new-console-template for more information
using System.Text.Json;
using System.Text.Json.Nodes;
using CHUNITHM_Patch_Finder;
using Reloaded.Memory.Sigscan;
using Reloaded.Memory.Sigscan.Definitions.Structs;
using YamlDotNet.Serialization;
using YamlDotNet.Serialization.NamingConventions;
if (args.Length < 1)
{
Console.WriteLine($"Usage: {Environment.ProcessPath} <PATH TO EXE>");
Environment.Exit(22); // EINVAL
}
var deserializer = new DeserializerBuilder()
.WithNamingConvention(LowerCaseNamingConvention.Instance)
.Build();
var patches =
deserializer.Deserialize<Pattern[]>(
File.ReadAllText("patterns.yaml"));
var binary = File.ReadAllBytes(args[0]);
var scanner = new Scanner(binary);
var exportedPatches = new JsonArray();
// Other patches
foreach (var patch in patches)
{
var signatures = patch.Patches.Select(p => p.Signature ?? patch.Signature).ToList();
if (signatures.Any(s => s == null))
{
Console.WriteLine($"[ERROR] No signature provided for patch {patch.Name}");
continue;
}
var matches = signatures
.Zip(scanner.FindPatternsCached(signatures)!)
.GroupBy(p => p.First)
.ToDictionary(g => g.Key, g => g.First().Second);
if (matches.Any(p => !p.Value.Found))
{
Console.WriteLine($"No offset found for patch {patch.Name}");
continue;
}
var patchObject = new JsonObject()
{
{ "name", patch.Name },
};
if (patch.Tooltip != null)
patchObject.Add("tooltip", patch.Tooltip);
else if (patch.Danger != null)
patchObject.Add("danger", patch.Danger);
var patchArray = new JsonArray();
foreach (var p in patch.Patches)
{
var signature = (p.Signature ?? patch.Signature)!;
var off = new JsonArray();
var on = new JsonArray();
foreach (var b in p.Off)
off.Add(b);
foreach (var b in p.On)
on.Add(b);
var pObject = new JsonObject()
{
{ "offset", matches[signature].Offset + p.Offset },
{ "off", off },
{ "on", on },
};
patchArray.Add(pObject);
}
patchObject.Add("patches", patchArray);
exportedPatches.Add(patchObject);
}
// max track count patch
if (Path.GetFileName(args[0]) == "chusanApp.exe")
{
var offset = scanner
.FindPatterns([
"E8 ?? ?? ?? ?? 8D ?? 78 8B F0", // SDHD 2.00-2.20
"E8 ?? ?? ?? ?? 8B 4C 24 24 8B F0", // SDGS 1.30
])
.FirstOrDefault(o => o.Found, new PatternScanResult(-1));
if (offset.Found)
{
var trackCountRelativeAddress = BitConverter.ToInt32(binary, offset.Offset + 1);
var trackCountAddress = offset.Offset + 5 + trackCountRelativeAddress;
Console.WriteLine($"Found track count function at {trackCountAddress:X}");
var patch = new JsonObject
{
{ "type", "number" },
{ "name", "Maximum tracks" },
{ "offset", trackCountAddress + 1 },
{ "size", 4 },
{ "min", 3 },
{ "max", 12 }
};
exportedPatches.Add(patch);
}
else
{
Console.WriteLine("Track count function not found");
}
}
File.WriteAllText(
"patches.json",
JsonSerializer.Serialize(exportedPatches, new JsonSerializerOptions(JsonSerializerOptions.Default)
{
WriteIndented = true
}));
Console.WriteLine("Wrote patches to patches.json");

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README.md Normal file
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A shittily written patch finder hacked together with
[Reloaded.Memory.Sigscan](https://github.com/Reloaded-Project/Reloaded.Memory.SigScan).
Originally written for CHUNITHM, hence the name, but can be used
with pretty much anything as long as you have the signatures.
## Usage
```sh
./CHUNITHM-Patch-Finder <PATH TO EXE>
```
The program expects a file called `patterns.yaml` (see files in
repo for example) and outputs BemaniPatcher-compatible patches
to `patches.json`.

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# The patches.yaml format is basically the same thing as the BemaniPatcher format, with 2 major differences:
# - There's a global, as well as patch-specific, signature for the patch.
# - The `offset` here is the offset from the start of the signature. For example, if you want to modify the 4th byte in
# `12 34 56 ??`, the offset should be 0x03.
- name: "Disable shop close lockout"
tooltip: "Disables ~12-8am lockout. Does not disable maintenance lockout from 6:30-7am JST"
signature: "56 8B CB E8 ?? ?? ?? ?? 84 C0 ?? 0E"
patches:
- offset: 0x0A
off: [0x74]
on: [0xEB]
- name: "Force shared audio mode, system audio sample rate must be 48000Hz"
tooltip: "Improves compatibility, but may increase latency"
signature: "83 3D ?? ?? ?? ?? ?? 0F 85 ?? ?? ?? ?? 6A ?? E8 ?? ?? ?? ??"
patches:
- offset: 0x0E
off: [0x01]
on: [0x00]
- name: "Force 2 channel audio output"
signature: "56 E8 ?? ?? ?? ?? 83 C4 04 85 C0 ?? ?? 68 ?? ?? ?? ?? E8 ?? ?? ?? ??"
patches:
- offset: 0x0B
off: [0x75, 0x3F]
on: [0x90, 0x90]
- name: "Disable song select timer"
signature: "E8 ?? ?? ?? ?? 3C 01 74 71 8B 0D ?? ?? ?? ?? E8 ?? ?? ?? ?? 8B C8 E8 ?? ?? ?? ?? 8D 48 78 E8 ?? ?? ?? ?? 3C 01 ?? 53"
patches:
- offset: 0x25
off: [0x74]
on: [0xEB]
- name: "Set all timers to 999"
danger: "Breaks online matching functionality"
signature: "8B 44 24 04 69 C0 E8 03 00 00"
patches:
- offset: 0x00
off: [0x8B, 0x44, 0x24, 0x04, 0x69, 0xC0, 0xE8, 0x03, 0x00, 0x00]
on: [0xB8, 0x58, 0x3E, 0x0F, 0x00, 0x90, 0x90, 0x90, 0x90, 0x90]
- name: "Unlimited maximum tracks"
tooltip: "Must check to play more than 7 tracks per credit"
signature: "B8 07 00 00 00 3B F0 0F 47 ??"
patches:
- offset: 0x09
off: [0xF0]
on: [0xC0]
- name: "No encryption"
tooltip: "Will also disable TLS"
signature: "3F 41 56 44 65 66 6C 61 74 65 40 70 72 6F 6A 43 6C 69 65 6E 74 40 40 ?? ?? ?? ?? ?? ?? ?? ??"
# 0xDC should be set to whatever the current CHUNITHM integer version is, e.g. 220
patches:
- offset: 0x1B
off: [0xDC]
on: [0x00]
- offset: 0x1E
off: [0xDC]
on: [0x00]
- name: "No TLS"
tooltip: "Title server workaround"
signature: "E8 ?? ?? ?? ?? 85 C0 75 07 BE 00 00 ?? 00"
patches:
- offset: 0x0C
off: [0x80]
on: [0x00]
- name: "Patch for head-to-head play"
tooltip: "Fix infinite sync while trying to connect to head to head play"
signature: "50 68 ?? ?? ?? ?? FF 76 1C C7 44 24 ?? ?? ?? ?? ?? FF 15 ?? ?? ?? ??"
patches:
- offset: 0x0D
off: [0x01]
on: [0x00]
- name: "Disable 1080p check"
signature: "81 BC 24 B8 02 00 00 80 07 00 00 75 1F 81 BC 24 BC 02 00 00 38 04 00 00 75 12"
patches:
- offset: 0x00
off: [0x81, 0xBC, 0x24, 0xB8, 0x02, 0x00, 0x00, 0x80, 0x07, 0x00, 0x00, 0x75, 0x1F, 0x81, 0xBC, 0x24, 0xBC, 0x02, 0x00, 0x00, 0x38, 0x04, 0x00, 0x00, 0x75, 0x12]
on: [0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90]
- name: "Force 120Hz check"
tooltip: "Check to make the 120Hz check always pass (do not use with CVT mode)"
signature: "50 56 6A 00 FF D7 ?? ?? 74 3F"
patches:
- offset: 0x06
off: [0x85, 0xC0]
on: [0xEB, 0x30]
- name: "Bypass LED board check"
danger: "[DEPRECATED] Forces LED board check to good and auto continues"
signature: "E8 ?? ?? ?? ?? 39 44 24 18 7D 0C C6 86 ?? ?? ?? ?? ?? C6 44 24 ?? ??"
patches:
- offset: 0x11
off: [0x01]
on: [0x00]
- offset: 0x16
off: [0x00]
on: [0x01]
- name: "Ignore some errors from amdaemon"
danger: "[DEPRECATED] May relieve some errors like error 6401, but may also cause problems elsewhere."
signature: "8B F9 8B CE E8 ?? ?? ?? ?? 8B CE E8 ?? ?? ?? ?? 3C 01 ?? 14"
patches:
- offset: 0x12
off: [0x75]
on: [0xEB]

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- name: Allow 127.0.0.1/localhost as the network server
patches:
- signature: "31 32 37 2F 38 00"
offset: 0x00
off: [0x31, 0x32, 0x37, 0x2F]
on: [0x30, 0x2F, 0x38, 0x00]
- signature: "48 83 EC 28 FF 15 ?? ?? ?? ?? 8B C8 3D ?? ?? ?? ?? 77 0A"
offset: 0x04
# You probably want this for older versions of amdaemon
# off: [0xFF, 0x15, 0x3E, 0x79, 0x1A, 0x00, 0x8B]
off: [0xFF, 0x15, 0xC6, 0x2F, 0x1B, 0x00, 0x8B]
on: [0x33, 0xC0, 0x48, 0x83, 0xC4, 0x28, 0xC3]
- name: Infinite credits
signature: "74 23 40 28 7C 4A ?? 39 05 ?? ?? ?? ?? 74 05"
patches:
- offset: 0x03
off: [0x28]
on: [0x08]