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Formats: Add option for multiple load strategies per sub-image

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This commit is contained in:
Katy Coe
2020-12-14 02:52:57 +01:00
parent 14f4e034b0
commit 7878193f74
3 changed files with 30 additions and 16 deletions
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12
Il2CppInspector.Common/FileFormatReaders/FileFormatReader.cs
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@@ -21,15 +21,16 @@ namespace Il2CppInspector
long Length { get; }
uint NumImages { get; }
string DefaultFilename { get; }
bool IsModified { get; }
IEnumerable<IFileFormatReader> Images { get; }
IFileFormatReader this[uint index] { get; }
bool IsModified { get; }
IEnumerable<IFileFormatReader> Images { get; } // Each child image of this object (eg. 32/64-bit versions in Fat MachO file)
IFileFormatReader this[uint index] { get; } // With no additional override, one object = one file, this[0] == this
long Position { get; set; }
string Format { get; }
string Arch { get; }
int Bits { get; }
ulong GlobalOffset { get; } // The virtual address where the code section (.text) would be loaded in memory
ulong ImageBase { get; } // The virtual address of where the image would be loaded in memory (same as GlobalOffset except for PE)
IEnumerable<IFileFormatReader> TryNextLoadStrategy(); // Some images can be loaded multiple ways, eg. default, packed
Dictionary<string, Symbol> GetSymbolTable();
uint[] GetFunctionTable();
IEnumerable<Export> GetExports();
@@ -184,9 +185,12 @@ namespace Il2CppInspector
// Confirm file is valid and set up RVA mappings
protected virtual bool Init() => throw new NotImplementedException();
// Choose a sub-binary within the image for multi-architecture binaries
// Choose an image within the file for multi-architecture binaries
public virtual IFileFormatReader this[uint index] => (index == 0)? this : throw new IndexOutOfRangeException("Binary image index out of bounds");
// For images that can be loaded and then tested with Il2CppBinary in multiple ways, get the next possible version of the image
public virtual IEnumerable<IFileFormatReader> TryNextLoadStrategy() { yield return this; }
// Find search locations in the symbol table for Il2Cpp data
public virtual Dictionary<string, Symbol> GetSymbolTable() => new Dictionary<string, Symbol>();

32
Il2CppInspector.Common/IL2CPP/Il2CppBinary.cs
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@@ -95,12 +95,16 @@ namespace Il2CppInspector
protected Il2CppBinary(IFileFormatReader stream, EventHandler<string> statusCallback = null) {
Image = stream;
OnStatusUpdate = statusCallback;
StatusUpdate($"Analyzing IL2CPP data for {Image.Format}/{Image.Arch} image");
DiscoverAPIExports();
}
protected Il2CppBinary(IFileFormatReader stream, uint codeRegistration, uint metadataRegistration, EventHandler<string> statusCallback = null) {
Image = stream;
OnStatusUpdate = statusCallback;
StatusUpdate($"Analyzing IL2CPP data for {Image.Format}/{Image.Arch} image");
DiscoverAPIExports();
PrepareMetadata(codeRegistration, metadataRegistration);
}
@@ -123,8 +127,12 @@ namespace Il2CppInspector
// Load binary without a global-metadata.dat available
public static Il2CppBinary Load(IFileFormatReader stream, double metadataVersion, EventHandler<string> statusCallback = null) {
var inst = LoadImpl(stream, statusCallback);
return inst.FindRegistrationStructs(metadataVersion) ? inst : null;
foreach (var loadedImage in stream.TryNextLoadStrategy()) {
var inst = LoadImpl(stream, statusCallback);
if (inst.FindRegistrationStructs(metadataVersion))
return inst;
}
return null;
}
// Load binary with a global-metadata.dat available
@@ -133,8 +141,12 @@ namespace Il2CppInspector
// Metadata will be used to try to find the required structures with data analysis
// If it is not specified, data analysis will not be performed
public static Il2CppBinary Load(IFileFormatReader stream, Metadata metadata, EventHandler<string> statusCallback = null) {
var inst = LoadImpl(stream, statusCallback);
return inst.FindRegistrationStructs(metadata) ? inst : null;
foreach (var loadedImage in stream.TryNextLoadStrategy()) {
var inst = LoadImpl(stream, statusCallback);
if (inst.FindRegistrationStructs(metadata))
return inst;
}
return null;
}
// Save binary to file, overwriting if necessary
@@ -146,24 +158,24 @@ namespace Il2CppInspector
}
// Initialize binary without a global-metadata.dat available
public bool FindRegistrationStructs(double metadataVersion, EventHandler<string> statusCallback = null) {
public bool FindRegistrationStructs(double metadataVersion) {
Image.Version = metadataVersion;
if (!((FindMetadataFromSymbols() ?? FindMetadataFromCode()) is var ptrs))
if (!((FindMetadataFromSymbols() ?? FindMetadataFromCode()) is (ulong code, ulong meta)))
return false;
PrepareMetadata(ptrs.Value.Item1, ptrs.Value.Item2);
PrepareMetadata(code, meta);
return true;
}
// Initialize binary with a global-metadata.dat available
public bool FindRegistrationStructs(Metadata metadata, EventHandler<string> statusCallback = null) {
public bool FindRegistrationStructs(Metadata metadata) {
Image.Version = metadata.Version;
if (!((FindMetadataFromSymbols() ?? FindMetadataFromCode() ?? FindMetadataFromData(metadata)) is var ptrs))
if (!((FindMetadataFromSymbols() ?? FindMetadataFromCode() ?? FindMetadataFromData(metadata)) is (ulong code, ulong meta)))
return false;
PrepareMetadata(ptrs.Value.Item1, ptrs.Value.Item2, metadata);
PrepareMetadata(code, meta);
return true;
}