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Plugins: Add PluginEventInfo and IPostProcessMetadata

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This commit is contained in:
Katy Coe
2020-12-20 23:24:09 +01:00
parent 64a7b26134
commit c6e9e26111
6 changed files with 153 additions and 23 deletions
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43
Il2CppInspector.Common/IL2CPP/Metadata.cs
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@@ -50,41 +50,50 @@ namespace Il2CppInspector
public Metadata(MemoryStream stream, EventHandler<string> statusCallback = null) : base(stream)
{
// Read magic bytes
if (ReadUInt32() != 0xFAB11BAF) {
// Pre-processing hook
var pluginResult = PluginHooks.PreProcessMetadata(stream);
IsModified = pluginResult.IsStreamModified;
// Read metadata header
Header = ReadObject<Il2CppGlobalMetadataHeader>(0);
// Check for correct magic bytes
if (Header.signature != Il2CppConstants.MetadataSignature) {
throw new InvalidOperationException("The supplied metadata file is not valid.");
}
// Set object versioning for Bin2Object from metadata version
Version = ReadInt32();
Version = Header.version;
// Rewind and read metadata header in full
Header = ReadObject<Il2CppGlobalMetadataHeader>(0);
if (Version < 16 || Version > 27)
{
if (Version < 16 || Version > 27) {
throw new InvalidOperationException($"The supplied metadata file is not of a supported version ({Header.version}).");
}
// Rewind and read metadata header with the correct version settings
Header = ReadObject<Il2CppGlobalMetadataHeader>(0);
// 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 0x110 (24.0, 24.1) or 0x108 (24.2) bytes long. Since 'stringLiteralOffset' is the first thing
// 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
// 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 narrow down the metadata version to 24.0/24.1 or 24.2.
var realHeaderLength = Header.stringLiteralOffset;
if (!pluginResult.AdditionalData.SkipValidation) {
var realHeaderLength = Header.stringLiteralOffset;
if (realHeaderLength != Sizeof(typeof(Il2CppGlobalMetadataHeader))) {
if (Version == 24.0) {
Version = 24.2;
Header = ReadObject<Il2CppGlobalMetadataHeader>(0);
if (realHeaderLength != Sizeof(typeof(Il2CppGlobalMetadataHeader))) {
if (Version == 24.0) {
Version = 24.2;
Header = ReadObject<Il2CppGlobalMetadataHeader>(0);
}
}
}
if (realHeaderLength != Sizeof(typeof(Il2CppGlobalMetadataHeader))) {
throw new InvalidOperationException("Could not verify the integrity of the metadata file or accurately identify the metadata sub-version");
if (realHeaderLength != Sizeof(typeof(Il2CppGlobalMetadataHeader))) {
throw new InvalidOperationException("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
@@ -219,7 +228,7 @@ namespace Il2CppInspector
StringLiterals[i] = ReadFixedLengthString(Header.stringLiteralDataOffset + stringLiteralList[i].dataIndex, stringLiteralList[i].length);
// Post-processing hook
PluginHooks.PostProcessMetadata(this);
IsModified |= PluginHooks.PostProcessMetadata(this).IsStreamModified;
}
// Save metadata to file, overwriting if necessary

2
Il2CppInspector.Common/IL2CPP/MetadataClasses.cs
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@@ -38,7 +38,7 @@ namespace Il2CppInspector
#pragma warning disable CS0649
public class Il2CppGlobalMetadataHeader
{
public uint sanity;
public uint signature;
public int version;
public int stringLiteralOffset; // string data for managed code
public int stringLiteralCount;