WASM Dumping Issue.

[pjsny]

• Il2CppDumper version - v6.6.2

• Target Unity version - Unknown, Metadata Version = 27

• Describe the issue

Initializing metadata...
Metadata Version: 27
Initializing il2cpp file...
Il2Cpp Version: 27
Searching...
System.IO.EndOfStreamException: Unable to read beyond the end of the stream.
at System.IO.__Error.EndOfFile()
at System.IO.BinaryReader.FillBuffer(Int32 numBytes)
at System.IO.BinaryReader.ReadUInt32()
at Il2CppDumper.PlusSearch.FindReference(UInt64 addr) in C:\projects\il2cppdumper\Il2CppDumper\Utils\PlusSearch.cs:line 359
at Il2CppDumper.PlusSearch.FindCodeRegistration2019() in C:\projects\il2cppdumper\Il2CppDumper\Utils\PlusSearch.cs:line 339
at Il2CppDumper.WebAssemblyMemory.PlusSearch(Int32 methodCount, Int32 typeDefinitionsCount, Int32 imageCount) in C:\projects\il2cppdumper\Il2CppDumper\ExecutableFormats\WebAssemblyMemory.cs:line 48
at Il2CppDumper.Program.Init(String il2cppPath, String metadataPath, Metadata& metadata, Il2Cpp& il2Cpp) in C:\projects\il2cppdumper\Il2CppDumper\Program.cs:line 197
ERROR: An error occurred while processing.

Files to reproduce

files.zip

[OdinVex]

I get EOF issues too but only when targetting the Linux build of a game versus the Windows one which works, Metadata 24.2. The Linux version will report "WARNING: find .init_proc" with CR and MR reporting 0. Looking into it on my own. I'll probably have to just hook "il2cpp_class_from_name" and "il2cpp_class_get_method_from_name".

[pjsny]

Yeah, this is targeting the Web-Assembly build. No native executable for this game, unfortunately.

[OdinVex]

Mine is a native build though, so I'll probably just clone and work on it myself sometime.

[Brian151]

how do i even get the global-metadata.dat file from a unity webgl game?

[pjsny]

Any update on this?

[soyasoya5]

Have you try setting offsetEnd and addressEnd in this file to STATICTOP?

Il2CppDumper/Il2CppDumper/ExecutableFormats/WebAssemblyMemory.cs

Line 59 in 1852783

offsetEnd = long.MaxValue, //hack

According to this answer by @Perfare , you'll have to find the STATICTOP variable in the Unity framework .js file.
#202 (comment)

It may look like this

    GLOBAL_BASE = 1024;
    STATIC_BASE = GLOBAL_BASE;
    STATICTOP = STATIC_BASE + 4397328;

As for obtaining the global-metadata.dat files for Unity WebGL builds, there are hints in the issue I linked above, it should be easy enough to obtain as the data files are usually sent alongside with the .wasm file.

Edit:
After some testing with some WASM dumping on my own and receiving the same error as OP, I've found that the error was not related to the stream processing at all. I managed to obtain a working set of dumps after inputting the correct CodeRegistration and MetadataRegistration. Is it possible that you did not input the correct CodeRegistration & MetadataRegistration?

[me0wday]

@soyasoya5 I was experimenting with this too, I noticed for me the tool had issues finding the MetadataRegistration address, any chance you can provide some information on how you found it manually in the wasm file?

[soyasoya5]

@soyasoya5 I was experimenting with this too, I noticed for me the tool had issues finding the MetadataRegistration address, any chance you can provide some information on how you found it manually in the wasm file?

I used wasm2wat to translate it into text format

[zonya1]

so I managed to dump a WebGL game. but do anyone know if its possible to "cross-reference" the methods from the DLLs containing the method names to the WASM file (to find the method in WAT text format)?