182 lines
10 KiB
C#
182 lines
10 KiB
C#
/*
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Copyright 2017 Perfare - https://github.com/Perfare/Il2CppDumper
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Copyright 2017-2020 Katy Coe - http://www.hearthcode.org - http://www.djkaty.com
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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.IO;
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using System.Linq;
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using System.Reflection;
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using NoisyCowStudios.Bin2Object;
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namespace Il2CppInspector
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{
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public class Metadata : BinaryObjectReader
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{
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public Il2CppGlobalMetadataHeader Header;
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public Il2CppAssemblyDefinition[] Assemblies { get; }
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public Il2CppImageDefinition[] Images { get; }
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public Il2CppTypeDefinition[] Types { get; }
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public Il2CppMethodDefinition[] Methods { get; }
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public Il2CppParameterDefinition[] Params { get; }
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public Il2CppFieldDefinition[] Fields { get; }
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public Il2CppFieldDefaultValue[] FieldDefaultValues { get; }
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public Il2CppParameterDefaultValue[] ParameterDefaultValues { get; }
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public Il2CppPropertyDefinition[] Properties { get; }
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public Il2CppEventDefinition[] Events { get; }
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public Il2CppGenericContainer[] GenericContainers { get; }
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public Il2CppGenericParameter[] GenericParameters { get; }
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public Il2CppCustomAttributeTypeRange[] AttributeTypeRanges { get; }
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public Il2CppInterfaceOffsetPair[] InterfaceOffsets { get; }
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public Il2CppMetadataUsageList[] MetadataUsageLists { get; }
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public Il2CppMetadataUsagePair[] MetadataUsagePairs { get; }
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public Il2CppFieldRef[] FieldRefs { get; }
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public int[] InterfaceUsageIndices { get; }
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public int[] NestedTypeIndices { get; }
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public int[] AttributeTypeIndices { get; }
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public int[] GenericConstraintIndices { get; }
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public uint[] VTableMethodIndices { get; }
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public string[] StringLiterals { get; }
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public Dictionary<int, string> Strings { get; } = new Dictionary<int, string>();
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public Metadata(Stream stream) : base(stream)
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{
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// Read magic bytes
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if (ReadUInt32() != 0xFAB11BAF) {
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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 = ReadInt32();
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// Rewind and read metadata header in full
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Header = ReadObject<Il2CppGlobalMetadataHeader>(0);
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if (Version < 16 || Version > 24)
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{
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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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// 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, 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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var realHeaderLength = Header.stringLiteralOffset;
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if (realHeaderLength != Sizeof(typeof(Il2CppGlobalMetadataHeader))) {
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if (Version == 24.0) {
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Version = 24.2;
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Header = ReadObject<Il2CppGlobalMetadataHeader>(0);
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}
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}
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if (realHeaderLength != Sizeof(typeof(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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// Load all the relevant metadata using offsets provided in the header
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if (Version >= 16)
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Images = ReadArray<Il2CppImageDefinition>(Header.imagesOffset, Header.imagesCount / Sizeof(typeof(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 >= 19 && Images.Any(x => x.token != 1))
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if (Version == 24.0) {
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Version = 24.1;
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// No need to re-read the header, it's the same for both sub-versions
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Images = ReadArray<Il2CppImageDefinition>(Header.imagesOffset, Header.imagesCount / Sizeof(typeof(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 = ReadArray<Il2CppTypeDefinition>(Header.typeDefinitionsOffset, Header.typeDefinitionsCount / Sizeof(typeof(Il2CppTypeDefinition)));
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Methods = ReadArray<Il2CppMethodDefinition>(Header.methodsOffset, Header.methodsCount / Sizeof(typeof(Il2CppMethodDefinition)));
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Params = ReadArray<Il2CppParameterDefinition>(Header.parametersOffset, Header.parametersCount / Sizeof(typeof(Il2CppParameterDefinition)));
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Fields = ReadArray<Il2CppFieldDefinition>(Header.fieldsOffset, Header.fieldsCount / Sizeof(typeof(Il2CppFieldDefinition)));
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FieldDefaultValues = ReadArray<Il2CppFieldDefaultValue>(Header.fieldDefaultValuesOffset, Header.fieldDefaultValuesCount / Sizeof(typeof(Il2CppFieldDefaultValue)));
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Properties = ReadArray<Il2CppPropertyDefinition>(Header.propertiesOffset, Header.propertiesCount / Sizeof(typeof(Il2CppPropertyDefinition)));
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Events = ReadArray<Il2CppEventDefinition>(Header.eventsOffset, Header.eventsCount / Sizeof(typeof(Il2CppEventDefinition)));
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InterfaceUsageIndices = ReadArray<int>(Header.interfacesOffset, Header.interfacesCount / sizeof(int));
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NestedTypeIndices = ReadArray<int>(Header.nestedTypesOffset, Header.nestedTypesCount / sizeof(int));
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GenericContainers = ReadArray<Il2CppGenericContainer>(Header.genericContainersOffset, Header.genericContainersCount / Sizeof(typeof(Il2CppGenericContainer)));
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GenericParameters = ReadArray<Il2CppGenericParameter>(Header.genericParametersOffset, Header.genericParametersCount / Sizeof(typeof(Il2CppGenericParameter)));
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GenericConstraintIndices = ReadArray<int>(Header.genericParameterConstraintsOffset, Header.genericParameterConstraintsCount / sizeof(int));
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InterfaceOffsets = ReadArray<Il2CppInterfaceOffsetPair>(Header.interfaceOffsetsOffset, Header.interfaceOffsetsCount / Sizeof(typeof(Il2CppInterfaceOffsetPair)));
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VTableMethodIndices = ReadArray<uint>(Header.vtableMethodsOffset, Header.vtableMethodsCount / sizeof(uint));
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if (Version >= 16) {
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Assemblies = ReadArray<Il2CppAssemblyDefinition>(Header.assembliesOffset, Header.assembliesCount / Sizeof(typeof(Il2CppAssemblyDefinition)));
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ParameterDefaultValues = ReadArray<Il2CppParameterDefaultValue>(Header.parameterDefaultValuesOffset, Header.parameterDefaultValuesCount / Sizeof(typeof(Il2CppParameterDefaultValue)));
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}
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if (Version >= 19) {
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MetadataUsageLists = ReadArray<Il2CppMetadataUsageList>(Header.metadataUsageListsOffset, Header.metadataUsageListsCount / Sizeof(typeof(Il2CppMetadataUsageList)));
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MetadataUsagePairs = ReadArray<Il2CppMetadataUsagePair>(Header.metadataUsagePairsOffset, Header.metadataUsagePairsCount / Sizeof(typeof(Il2CppMetadataUsagePair)));
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FieldRefs = ReadArray<Il2CppFieldRef>(Header.fieldRefsOffset, Header.fieldRefsCount / Sizeof(typeof(Il2CppFieldRef)));
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}
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if (Version >= 21) {
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AttributeTypeIndices = ReadArray<int>(Header.attributeTypesOffset, Header.attributeTypesCount / sizeof(int));
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AttributeTypeRanges = ReadArray<Il2CppCustomAttributeTypeRange>(Header.attributesInfoOffset, Header.attributesInfoCount / Sizeof(typeof(Il2CppCustomAttributeTypeRange)));
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}
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// Get all metadata string literals
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Position = Header.stringOffset;
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while (Position < Header.stringOffset + Header.stringCount)
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Strings.Add((int)Position - Header.stringOffset, ReadNullTerminatedString());
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// Get all managed code string literals
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var stringLiteralList = ReadArray<Il2CppStringLiteral>(Header.stringLiteralOffset, Header.stringLiteralCount / Sizeof(typeof(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, stringLiteralList[i].length);
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}
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private int Sizeof(Type type)
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{
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int size = 0;
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foreach (var i in type.GetTypeInfo().GetFields())
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{
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// Only process fields for our selected object versioning
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var versionAttr = i.GetCustomAttribute<VersionAttribute>(false);
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if (versionAttr != null) {
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if (versionAttr.Min != -1 && versionAttr.Min > Version)
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continue;
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if (versionAttr.Max != -1 && versionAttr.Max < Version)
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continue;
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}
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if (i.FieldType == typeof(int) || i.FieldType == typeof(uint))
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size += 4;
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else if (i.FieldType == typeof(short) || i.FieldType == typeof(ushort))
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size += 2;
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// Fixed-length array
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else if (i.FieldType.IsArray) {
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var attr = i.GetCustomAttribute<ArrayLengthAttribute>(false) ??
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throw new InvalidOperationException("Array field " + i.Name + " must have ArrayLength attribute");
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size += attr.FixedSize;
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}
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// Embedded object
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else
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size += Sizeof(i.FieldType);
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}
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return size;
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}
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}
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}
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