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IL2CPP: Use mapped objects for Sizeof

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This commit is contained in:
Katy Coe
2020-12-21 22:03:43 +01:00
parent c60eca4ec7
commit fbc8e0950c
3 changed files with 12 additions and 9 deletions
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4
Il2CppInspector.Common/IL2CPP/ImageScan.cs
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@@ -116,7 +116,7 @@ namespace Il2CppInspector
throw new InvalidOperationException("More than one valid pointer chain found during data heuristics");
// pCodeGenModules is the last field in CodeRegistration so we subtract the size of one pointer from the struct size
codeRegistration = codeRegVas.First() - ((ulong) Metadata.Sizeof(typeof(Il2CppCodeRegistration), Image.Version, Image.Bits / 8) - ptrSize);
codeRegistration = codeRegVas.First() - ((ulong) metadata.Sizeof(typeof(Il2CppCodeRegistration), Image.Version, Image.Bits / 8) - ptrSize);
// In v24.3, windowsRuntimeFactoryTable collides with codeGenModules. So far no samples have had windowsRuntimeFactoryCount > 0;
// if this changes we'll have to get smarter about disambiguating these two.
@@ -157,7 +157,7 @@ namespace Il2CppInspector
// Find TypeDefinitionsSizesCount (4th last field) then work back to the start of the struct
// This saves us from guessing where metadataUsagesCount is later
var mrSize = (ulong) Metadata.Sizeof(typeof(Il2CppMetadataRegistration), Image.Version, Image.Bits / 8);
var mrSize = (ulong) metadata.Sizeof(typeof(Il2CppMetadataRegistration), Image.Version, Image.Bits / 8);
vas = FindAllMappedWords(imageBytes, (ulong) metadata.Types.Length).Select(a => a - mrSize + ptrSize * 4);
// >= 19 && < 27

9
Il2CppInspector.Common/IL2CPP/Metadata.cs
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@@ -198,7 +198,7 @@ namespace Il2CppInspector
// Now confirm that all the keys are present
// If they aren't, that means one or more of the null terminators wasn't null, indicating potential encryption
// Only do this if we need to because it's very slow
if (stringOffsets.Except(Strings.Keys).Any()) {
if (Header.stringCount > 0 && stringOffsets.Except(Strings.Keys).Any()) {
Console.WriteLine("Decrypting strings...");
StatusUpdate("Decrypting strings");
@@ -251,9 +251,12 @@ namespace Il2CppInspector
CopyTo(outFile);
}
internal int Sizeof(Type type) => Sizeof(type, Version);
public int Sizeof(Type type) => Sizeof(type, Version);
public int Sizeof(Type type, double metadataVersion, int longSizeBytes = 8) {
public static int Sizeof(Type type, double metadataVersion, int longSizeBytes = 8) {
if (Reader.ObjectMappings.TryGetValue(type, out var streamType))
type = streamType;
int size = 0;
foreach (var i in type.GetTypeInfo().GetFields())

8
Il2CppInspector.Common/IL2CPP/ReconstructMetadata.cs
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@@ -22,10 +22,10 @@ namespace Il2CppInspector
// optinally constrained by the highest count in the IL2CPP metadata type and by the end of the nearest section in the image.
// Returns an array of the pointers in sorted order and an array of maximum byte/word counts with corresponding indexes
private (List<ulong> ptrs, List<int> limits, List<int> originalCounts)
preparePointerList(Type type, ulong typePtr, IEnumerable<Section> sections, bool itemsAreWords = false) {
preparePointerList(Metadata metadata, Type type, ulong typePtr, IEnumerable<Section> sections, bool itemsAreWords = false) {
// Get number of pointer/count pairs in each structure
var itemsCount = Metadata.Sizeof(type, Image.Version, Image.Bits / 8) / (Image.Bits / 8) / 2;
var itemsCount = metadata.Sizeof(type, Image.Version, Image.Bits / 8) / (Image.Bits / 8) / 2;
// Read pointers and counts as two lists
var itemArray = Image.ReadMappedArray<ulong>(typePtr, itemsCount * 2);
@@ -101,8 +101,8 @@ namespace Il2CppInspector
}
// Fetch and sanitize our pointer and count lists
var (codePtrsOrdered, codeCountLimits, codeCounts) = preparePointerList(typeof(Il2CppCodeRegistration), CodeRegistrationPointer, dataSections, true);
var (metaPtrsOrdered, metaCountLimits, metaCounts) = preparePointerList(typeof(Il2CppMetadataRegistration), MetadataRegistrationPointer, dataSections);
var (codePtrsOrdered, codeCountLimits, codeCounts) = preparePointerList(metadata, typeof(Il2CppCodeRegistration), CodeRegistrationPointer, dataSections, true);
var (metaPtrsOrdered, metaCountLimits, metaCounts) = preparePointerList(metadata, typeof(Il2CppMetadataRegistration), MetadataRegistrationPointer, dataSections);
// Progress updater
var maxProgress = codeCounts.Sum() + metaCounts.Sum();