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Add sub-version heuristics for v24

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This commit is contained in:
Katy Coe
2019-10-16 10:33:21 +02:00
parent 2e644a7c97
commit 93f98f5d43
1 changed files with 29 additions and 3 deletions
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32
Il2CppInspector/Metadata.cs
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@@ -1,6 +1,6 @@
/*
Copyright 2017 Perfare - https://github.com/Perfare/Il2CppDumper
Copyright 2017 Katy Coe - http://www.hearthcode.org - http://www.djkaty.com
Copyright 2017-2019 Katy Coe - http://www.hearthcode.org - http://www.djkaty.com
All rights reserved.
*/
@@ -41,15 +41,41 @@ namespace Il2CppInspector
Version = ReadInt32();
// Rewind and read metadata header in full
Position -= 8;
Header = ReadObject<Il2CppGlobalMetadataHeader>();
Header = ReadObject<Il2CppGlobalMetadataHeader>(0);
if (Version < 21 || Version > 24)
{
throw new Exception($"ERROR: Metadata file supplied is not a supported version ({Header.version}).");
}
// Sanity checking
// Unity.IL2CPP.MetadataCacheWriter.WriteLibIl2CppMetadata always writes the metadata information in the same order it appears in the header,
// 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
// detect sub-versions.
// For metadata v24, the header can either be either 0x108 (24.0) or 0x110 (24.1) bytes long. Since 'stringLiteralOffset' is the first thing
// 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,
// we can use this value to determine the actual header length and therefore the IL2CPP metadata sub-version used.
var realHeaderLength = Header.stringLiteralOffset;
if (realHeaderLength != Sizeof(typeof(Il2CppGlobalMetadataHeader))) {
if (Version == 24.0) {
Version = 24.1;
Header = ReadObject<Il2CppGlobalMetadataHeader>(0);
}
}
if (realHeaderLength != Sizeof(typeof(Il2CppGlobalMetadataHeader))) {
throw new Exception("ERROR: Could not verify the integrity of the metadata file or accurately identify the metadata sub-version");
}
// Load all the relevant metadata using offsets provided in the header
Images = ReadArray<Il2CppImageDefinition>(Header.imagesOffset, Header.imagesCount / Sizeof(typeof(Il2CppImageDefinition)));
// As an additional sanity check, all images in the metadata should have Mono.Cecil.MetadataToken == 1
foreach (var i in Images)
if (i.token != 1)
throw new Exception("ERROR: Could not verify the integrity of the metadata file image list");
Types = ReadArray<Il2CppTypeDefinition>(Header.typeDefinitionsOffset, Header.typeDefinitionsCount / Sizeof(typeof(Il2CppTypeDefinition)));
Methods = ReadArray<Il2CppMethodDefinition>(Header.methodsOffset, Header.methodsCount / Sizeof(typeof(Il2CppMethodDefinition)));
Params = ReadArray<Il2CppParameterDefinition>(Header.parametersOffset, Header.parametersCount / Sizeof(typeof(Il2CppParameterDefinition)));