237 lines
14 KiB
C#
237 lines
14 KiB
C#
/*
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Copyright 2017 Perfare - https://github.com/Perfare/Il2CppDumper
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Copyright 2017-2021 Katy Coe - http://www.djkaty.com - https://github.com/djkaty
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All rights reserved.
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*/
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using System;
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using System.Collections.Generic;
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using System.Collections.Immutable;
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using System.IO;
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using System.Linq;
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using System.Reflection;
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using Il2CppInspector.Next;
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using Il2CppInspector.Next.Metadata;
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using NoisyCowStudios.Bin2Object;
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using VersionedSerialization;
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namespace Il2CppInspector
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{
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public class Metadata : BinaryObjectStreamReader
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{
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public Il2CppGlobalMetadataHeader Header { get; set; }
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public ImmutableArray<Il2CppAssemblyDefinition> Assemblies { get; set; }
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public ImmutableArray<Il2CppImageDefinition> Images { get; set; }
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public ImmutableArray<Il2CppTypeDefinition> Types { get; set; }
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public ImmutableArray<Il2CppMethodDefinition> Methods { get; set; }
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public ImmutableArray<Il2CppParameterDefinition> Params { get; set; }
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public ImmutableArray<Il2CppFieldDefinition> Fields { get; set; }
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public ImmutableArray<Il2CppFieldDefaultValue> FieldDefaultValues { get; set; }
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public ImmutableArray<Il2CppParameterDefaultValue> ParameterDefaultValues { get; set; }
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public ImmutableArray<Il2CppPropertyDefinition> Properties { get; set; }
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public ImmutableArray<Il2CppEventDefinition> Events { get; set; }
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public ImmutableArray<Il2CppGenericContainer> GenericContainers { get; set; }
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public ImmutableArray<Il2CppGenericParameter> GenericParameters { get; set; }
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public ImmutableArray<Il2CppCustomAttributeTypeRange> AttributeTypeRanges { get; set; }
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public ImmutableArray<Il2CppCustomAttributeDataRange> AttributeDataRanges { get; set; }
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public ImmutableArray<Il2CppInterfaceOffsetPair> InterfaceOffsets { get; set; }
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public ImmutableArray<Il2CppMetadataUsageList> MetadataUsageLists { get; set; }
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public ImmutableArray<Il2CppMetadataUsagePair> MetadataUsagePairs { get; set; }
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public ImmutableArray<Il2CppFieldRef> FieldRefs { get; set; }
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public ImmutableArray<int> InterfaceUsageIndices { get; set; }
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public ImmutableArray<int> NestedTypeIndices { get; set; }
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public ImmutableArray<int> AttributeTypeIndices { get; set; }
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public ImmutableArray<int> GenericConstraintIndices { get; set; }
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public ImmutableArray<uint> VTableMethodIndices { get; set; }
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public string[] StringLiterals { get; set; }
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public Dictionary<int, string> Strings { get; private set; } = new Dictionary<int, string>();
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// Set if something in the metadata has been modified / decrypted
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public bool IsModified { get; private set; } = false;
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// Status update callback
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private EventHandler<string> OnStatusUpdate { get; set; }
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private void StatusUpdate(string status) => OnStatusUpdate?.Invoke(this, status);
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// Initialize metadata object from a stream
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public static Metadata FromStream(MemoryStream stream, EventHandler<string> statusCallback = null) {
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// TODO: This should really be placed before the Metadata object is created,
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// but for now this ensures it is called regardless of which client is in use
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PluginHooks.LoadPipelineStarting();
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var metadata = new Metadata(statusCallback);
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stream.Position = 0;
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stream.CopyTo(metadata);
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metadata.Position = 0;
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metadata.Initialize();
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return metadata;
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}
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private Metadata(EventHandler<string> statusCallback = null) : base() => OnStatusUpdate = statusCallback;
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private void Initialize()
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{
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// Pre-processing hook
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var pluginResult = PluginHooks.PreProcessMetadata(this);
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IsModified = pluginResult.IsStreamModified;
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StatusUpdate("Processing metadata");
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// Read metadata header
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Header = ReadVersionedObject<Il2CppGlobalMetadataHeader>(0);
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// Check for correct magic bytes
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if (!Header.SanityValid) {
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throw new InvalidOperationException("The supplied metadata file is not valid.");
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}
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// Set object versioning for Bin2Object from metadata version
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Version = new StructVersion(Header.Version);
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if (Version < MetadataVersions.V160 || Version > MetadataVersions.V310) {
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throw new InvalidOperationException($"The supplied metadata file is not of a supported version ({Header.Version}).");
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}
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// Rewind and read metadata header with the correct version settings
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Header = ReadVersionedObject<Il2CppGlobalMetadataHeader>(0);
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// Sanity checking
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// Unity.IL2CPP.MetadataCacheWriter.WriteLibIl2CppMetadata always writes the metadata information in the same order it appears in the header,
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// with each block always coming directly after the previous block, 4-byte aligned. We can use this to check the integrity of the data and
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// detect sub-versions.
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// For metadata v24.0, the header can either be either 0x110 (24.0, 24.1) or 0x108 (24.2) bytes long. Since 'stringLiteralOffset' is the first thing
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// in the header after the sanity and version fields, and since it will always point directly to the first byte after the end of the header,
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// we can use this value to determine the actual header length and therefore narrow down the metadata version to 24.0/24.1 or 24.2.
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if (!pluginResult.SkipValidation) {
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var realHeaderLength = Header.StringLiteralOffset;
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if (realHeaderLength != Sizeof<Il2CppGlobalMetadataHeader>()) {
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if (Version == MetadataVersions.V240) {
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Version = MetadataVersions.V242;
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Header = ReadVersionedObject<Il2CppGlobalMetadataHeader>(0);
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}
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}
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if (realHeaderLength != Sizeof<Il2CppGlobalMetadataHeader>()) {
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throw new InvalidOperationException("Could not verify the integrity of the metadata file or accurately identify the metadata sub-version");
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}
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}
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// Load all the relevant metadata using offsets provided in the header
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if (Version >= MetadataVersions.V160)
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Images = ReadVersionedObjectArray<Il2CppImageDefinition>(Header.ImagesOffset, Header.ImagesSize / Sizeof<Il2CppImageDefinition>());
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// As an additional sanity check, all images in the metadata should have Mono.Cecil.MetadataToken == 1
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// In metadata v24.1, two extra fields were added which will cause the below test to fail.
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// In that case, we can then adjust the version number and reload
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// Tokens were introduced in v19 - we don't bother testing earlier versions
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if (Version >= MetadataVersions.V190 && Images.Any(x => x.Token != 1))
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if (Version == MetadataVersions.V240) {
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Version = MetadataVersions.V241;
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// No need to re-read the header, it's the same for both sub-versions
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Images = ReadVersionedObjectArray<Il2CppImageDefinition>(Header.ImagesOffset, Header.ImagesSize / Sizeof<Il2CppImageDefinition>());
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if (Images.Any(x => x.Token != 1))
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throw new InvalidOperationException("Could not verify the integrity of the metadata file image list");
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}
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Types = ReadVersionedObjectArray<Il2CppTypeDefinition>(Header.TypeDefinitionsOffset, Header.TypeDefinitionsSize / Sizeof<Il2CppTypeDefinition>());
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Methods = ReadVersionedObjectArray<Il2CppMethodDefinition>(Header.MethodsOffset, Header.MethodsSize / Sizeof<Il2CppMethodDefinition>());
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Params = ReadVersionedObjectArray<Il2CppParameterDefinition>(Header.ParametersOffset, Header.ParametersSize / Sizeof<Il2CppParameterDefinition>());
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Fields = ReadVersionedObjectArray<Il2CppFieldDefinition>(Header.FieldsOffset, Header.FieldsSize / Sizeof<Il2CppFieldDefinition>());
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FieldDefaultValues = ReadVersionedObjectArray<Il2CppFieldDefaultValue>(Header.FieldDefaultValuesOffset, Header.FieldDefaultValuesSize / Sizeof<Il2CppFieldDefaultValue>());
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Properties = ReadVersionedObjectArray<Il2CppPropertyDefinition>(Header.PropertiesOffset, Header.PropertiesSize / Sizeof<Il2CppPropertyDefinition>());
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Events = ReadVersionedObjectArray<Il2CppEventDefinition>(Header.EventsOffset, Header.EventsSize / Sizeof<Il2CppEventDefinition>());
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InterfaceUsageIndices = ReadPrimitiveArray<int>(Header.InterfacesOffset, Header.InterfacesSize / sizeof(int));
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NestedTypeIndices = ReadPrimitiveArray<int>(Header.NestedTypesOffset, Header.NestedTypesSize / sizeof(int));
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GenericContainers = ReadVersionedObjectArray<Il2CppGenericContainer>(Header.GenericContainersOffset, Header.GenericContainersSize / Sizeof<Il2CppGenericContainer>());
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GenericParameters = ReadVersionedObjectArray<Il2CppGenericParameter>(Header.GenericParametersOffset, Header.GenericParametersSize / Sizeof<Il2CppGenericParameter>());
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GenericConstraintIndices = ReadPrimitiveArray<int>(Header.GenericParameterConstraintsOffset, Header.GenericParameterConstraintsSize / sizeof(int));
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InterfaceOffsets = ReadVersionedObjectArray<Il2CppInterfaceOffsetPair>(Header.InterfaceOffsetsOffset, Header.InterfaceOffsetsSize / Sizeof<Il2CppInterfaceOffsetPair>());
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VTableMethodIndices = ReadPrimitiveArray<uint>(Header.VTableMethodsOffset, Header.VTableMethodsSize / sizeof(uint));
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if (Version >= MetadataVersions.V160) {
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// In v24.4 hashValueIndex was removed from Il2CppAssemblyNameDefinition, which is a field in Il2CppAssemblyDefinition
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// The number of images and assemblies should be the same. If they are not, we deduce that we are using v24.4
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// Note the version comparison matches both 24.2 and 24.3 here since 24.3 is tested for during binary loading
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var assemblyCount = Header.AssembliesSize / Sizeof<Il2CppAssemblyDefinition>();
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var changedAssemblyDefStruct = false;
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if ((Version == MetadataVersions.V241 || Version == MetadataVersions.V242 || Version == MetadataVersions.V243) && assemblyCount < Images.Length)
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{
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if (Version == MetadataVersions.V241)
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changedAssemblyDefStruct = true;
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Version = MetadataVersions.V244;
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}
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Assemblies = ReadVersionedObjectArray<Il2CppAssemblyDefinition>(Header.AssembliesOffset, Images.Length);
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if (changedAssemblyDefStruct)
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Version = MetadataVersions.V241;
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ParameterDefaultValues = ReadVersionedObjectArray<Il2CppParameterDefaultValue>(Header.ParameterDefaultValuesOffset, Header.ParameterDefaultValuesSize / Sizeof<Il2CppParameterDefaultValue>());
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}
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if (Version >= MetadataVersions.V190 && Version < MetadataVersions.V270) {
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MetadataUsageLists = ReadVersionedObjectArray<Il2CppMetadataUsageList>(Header.MetadataUsageListsOffset, Header.MetadataUsageListsCount / Sizeof<Il2CppMetadataUsageList>());
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MetadataUsagePairs = ReadVersionedObjectArray<Il2CppMetadataUsagePair>(Header.MetadataUsagePairsOffset, Header.MetadataUsagePairsCount / Sizeof<Il2CppMetadataUsagePair>());
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}
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if (Version >= MetadataVersions.V190) {
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FieldRefs = ReadVersionedObjectArray<Il2CppFieldRef>(Header.FieldRefsOffset, Header.FieldRefsSize / Sizeof<Il2CppFieldRef>());
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}
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if (Version >= MetadataVersions.V210 && Version < MetadataVersions.V290) {
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AttributeTypeIndices = ReadPrimitiveArray<int>(Header.AttributesTypesOffset, Header.AttributesTypesCount / sizeof(int));
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AttributeTypeRanges = ReadVersionedObjectArray<Il2CppCustomAttributeTypeRange>(Header.AttributesInfoOffset, Header.AttributesInfoCount / Sizeof<Il2CppCustomAttributeTypeRange>());
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}
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if (Version >= MetadataVersions.V290)
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{
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AttributeDataRanges = ReadVersionedObjectArray<Il2CppCustomAttributeDataRange>(Header.AttributeDataRangeOffset,
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Header.AttributeDataRangeSize / Sizeof<Il2CppCustomAttributeDataRange>());
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}
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// Get all metadata strings
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var pluginGetStringsResult = PluginHooks.GetStrings(this);
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if (pluginGetStringsResult.IsDataModified && !pluginGetStringsResult.IsInvalid)
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Strings = pluginGetStringsResult.Strings;
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else {
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Position = Header.StringOffset;
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while (Position < Header.StringOffset + Header.StringSize)
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Strings.Add((int) Position - Header.StringOffset, ReadNullTerminatedString());
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}
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// Get all string literals
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var pluginGetStringLiteralsResult = PluginHooks.GetStringLiterals(this);
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if (pluginGetStringLiteralsResult.IsDataModified)
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StringLiterals = pluginGetStringLiteralsResult.StringLiterals.ToArray();
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else {
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var stringLiteralList = ReadVersionedObjectArray<Il2CppStringLiteral>(Header.StringLiteralOffset, Header.StringLiteralSize / Sizeof<Il2CppStringLiteral>());
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StringLiterals = new string[stringLiteralList.Length];
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for (var i = 0; i < stringLiteralList.Length; i++)
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StringLiterals[i] = ReadFixedLengthString(Header.StringLiteralDataOffset + stringLiteralList[i].DataIndex, (int)stringLiteralList[i].Length);
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}
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// Post-processing hook
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IsModified |= PluginHooks.PostProcessMetadata(this).IsStreamModified;
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}
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// Save metadata to file, overwriting if necessary
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public void SaveToFile(string pathname) {
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Position = 0;
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using (var outFile = new FileStream(pathname, FileMode.Create, FileAccess.Write))
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CopyTo(outFile);
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}
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public int Sizeof<T>() where T : IReadable => T.Size(Version, Is32Bit);
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}
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}
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