86 lines
3.0 KiB
C#
86 lines
3.0 KiB
C#
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// dnlib: See LICENSE.txt for more info
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using System;
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using System.Runtime.InteropServices;
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using System.Threading;
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using dnlib.DotNet.MD;
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namespace dnlib.DotNet.Pdb.Dss {
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sealed unsafe class ReaderMetaDataImport : MetaDataImport, IDisposable {
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Metadata metadata;
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byte* blobPtr;
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IntPtr addrToFree;
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public ReaderMetaDataImport(Metadata metadata) {
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this.metadata = metadata ?? throw new ArgumentNullException(nameof(metadata));
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var reader = metadata.BlobStream.CreateReader();
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addrToFree = Marshal.AllocHGlobal((int)reader.BytesLeft);
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blobPtr = (byte*)addrToFree;
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if (blobPtr is null)
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throw new OutOfMemoryException();
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reader.ReadBytes(blobPtr, (int)reader.BytesLeft);
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}
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~ReaderMetaDataImport() => Dispose(false);
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public override void GetTypeRefProps(uint tr, uint* ptkResolutionScope, ushort* szName, uint cchName, uint* pchName) {
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var token = new MDToken(tr);
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if (token.Table != Table.TypeRef)
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throw new ArgumentException();
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if (!metadata.TablesStream.TryReadTypeRefRow(token.Rid, out var row))
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throw new ArgumentException();
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if (ptkResolutionScope is not null)
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*ptkResolutionScope = row.ResolutionScope;
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if (szName is not null || pchName is not null) {
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var typeNamespace = metadata.StringsStream.ReadNoNull(row.Namespace);
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var typeName = metadata.StringsStream.ReadNoNull(row.Name);
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CopyTypeName(typeNamespace, typeName, szName, cchName, pchName);
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}
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}
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public override void GetTypeDefProps(uint td, ushort* szTypeDef, uint cchTypeDef, uint* pchTypeDef, uint* pdwTypeDefFlags, uint* ptkExtends) {
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var token = new MDToken(td);
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if (token.Table != Table.TypeDef)
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throw new ArgumentException();
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if (!metadata.TablesStream.TryReadTypeDefRow(token.Rid, out var row))
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throw new ArgumentException();
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if (pdwTypeDefFlags is not null)
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*pdwTypeDefFlags = row.Flags;
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if (ptkExtends is not null)
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*ptkExtends = row.Extends;
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if (szTypeDef is not null || pchTypeDef is not null) {
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var typeNamespace = metadata.StringsStream.ReadNoNull(row.Namespace);
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var typeName = metadata.StringsStream.ReadNoNull(row.Name);
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CopyTypeName(typeNamespace, typeName, szTypeDef, cchTypeDef, pchTypeDef);
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}
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}
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public override void GetSigFromToken(uint mdSig, byte** ppvSig, uint* pcbSig) {
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var token = new MDToken(mdSig);
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if (token.Table != Table.StandAloneSig)
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throw new ArgumentException();
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if (!metadata.TablesStream.TryReadStandAloneSigRow(token.Rid, out var row))
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throw new ArgumentException();
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if (!metadata.BlobStream.TryCreateReader(row.Signature, out var reader))
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throw new ArgumentException();
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if (ppvSig is not null)
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*ppvSig = blobPtr + (reader.StartOffset - (uint)metadata.BlobStream.StartOffset);
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if (pcbSig is not null)
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*pcbSig = reader.Length;
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}
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public void Dispose() {
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Dispose(true);
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GC.SuppressFinalize(this);
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}
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void Dispose(bool disposing) {
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metadata = null;
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var addrToFreeTmp = Interlocked.Exchange(ref addrToFree, IntPtr.Zero);
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blobPtr = null;
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if (addrToFreeTmp != IntPtr.Zero)
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Marshal.FreeHGlobal(addrToFreeTmp);
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}
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}
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}
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