C# MemoryReader.SkipBytes方法代码示例

 static int CountCilInstructions(MemoryReader memReader) {
   int count = 0;
   while (memReader.NotEndOfBytes) {
     count++;
     OperationCode cilOpCode = memReader.ReadOpcode();
     switch (cilOpCode) {
       case OperationCode.Ldarg_S:
       case OperationCode.Ldarga_S:
       case OperationCode.Starg_S:
       case OperationCode.Ldloc_S:
       case OperationCode.Ldloca_S:
       case OperationCode.Stloc_S:
       case OperationCode.Ldc_I4_S:
       case OperationCode.Br_S:
       case OperationCode.Brfalse_S:
       case OperationCode.Brtrue_S:
       case OperationCode.Beq_S:
       case OperationCode.Bge_S:
       case OperationCode.Bgt_S:
       case OperationCode.Ble_S:
       case OperationCode.Blt_S:
       case OperationCode.Bne_Un_S:
       case OperationCode.Bge_Un_S:
       case OperationCode.Bgt_Un_S:
       case OperationCode.Ble_Un_S:
       case OperationCode.Blt_Un_S:
       case OperationCode.Leave_S:
       case OperationCode.Unaligned_:
       case OperationCode.No_:
         memReader.SkipBytes(1);
         break;
       case OperationCode.Ldarg:
       case OperationCode.Ldarga:
       case OperationCode.Starg:
       case OperationCode.Ldloc:
       case OperationCode.Ldloca:
       case OperationCode.Stloc:
         memReader.SkipBytes(2);
         break;
       case OperationCode.Ldc_I4:
       case OperationCode.Jmp:
       case OperationCode.Call:
       case OperationCode.Calli:
       case OperationCode.Br:
       case OperationCode.Brfalse:
       case OperationCode.Brtrue:
       case OperationCode.Beq:
       case OperationCode.Bge:
       case OperationCode.Bgt:
       case OperationCode.Ble:
       case OperationCode.Blt:
       case OperationCode.Bne_Un:
       case OperationCode.Bge_Un:
       case OperationCode.Bgt_Un:
       case OperationCode.Ble_Un:
       case OperationCode.Blt_Un:
       case OperationCode.Callvirt:
       case OperationCode.Cpobj:
       case OperationCode.Ldobj:
       case OperationCode.Ldstr:
       case OperationCode.Newobj:
       case OperationCode.Castclass:
       case OperationCode.Isinst:
       case OperationCode.Unbox:
       case OperationCode.Ldfld:
       case OperationCode.Ldflda:
       case OperationCode.Stfld:
       case OperationCode.Ldsfld:
       case OperationCode.Ldsflda:
       case OperationCode.Stsfld:
       case OperationCode.Stobj:
       case OperationCode.Box:
       case OperationCode.Newarr:
       case OperationCode.Ldelema:
       case OperationCode.Ldelem:
       case OperationCode.Stelem:
       case OperationCode.Unbox_Any:
       case OperationCode.Refanyval:
       case OperationCode.Mkrefany:
       case OperationCode.Ldtoken:
       case OperationCode.Leave:
       case OperationCode.Ldftn:
       case OperationCode.Ldvirtftn:
       case OperationCode.Initobj:
       case OperationCode.Constrained_:
       case OperationCode.Sizeof:
       case OperationCode.Ldc_R4:
         memReader.SkipBytes(4);
         break;
       case OperationCode.Ldc_I8:
       case OperationCode.Ldc_R8:
         memReader.SkipBytes(8);
         break;
       case OperationCode.Switch:
         int numTargets = (int)memReader.ReadUInt32();
         memReader.SkipBytes(4*numTargets);
         break;
       default:
         break;
     }
//.........这里部分代码省略.........

 bool ReadMetadataHeader(
   ref MemoryReader memReader
 )
   //^ requires this.ReaderState >= ReaderState.PEFile;
 {
   if (memReader.RemainingBytes < COR20Constants.MinimumSizeofMetadataHeader) {
     this.ErrorContainer.AddDirectoryError(Directories.Cor20HeaderMetaData, 0, MetadataReaderErrorKind.MetadataHeaderTooSmall);
     return false;
   }
   this.MetadataHeader.Signature = memReader.ReadUInt32();
   if (this.MetadataHeader.Signature != COR20Constants.COR20MetadataSignature) {
     this.ErrorContainer.AddDirectoryError(Directories.Cor20HeaderMetaData, memReader.Offset - sizeof(uint), MetadataReaderErrorKind.MetadataSignature);
     return false;
   }
   this.MetadataHeader.MajorVersion = memReader.ReadUInt16();
   this.MetadataHeader.MinorVersion = memReader.ReadUInt16();
   this.MetadataHeader.ExtraData = memReader.ReadUInt32();
   this.MetadataHeader.VersionStringSize = memReader.ReadInt32();
   if (memReader.RemainingBytes < this.MetadataHeader.VersionStringSize) {
     this.ErrorContainer.AddDirectoryError(Directories.Cor20HeaderMetaData, memReader.Offset, MetadataReaderErrorKind.NotEnoughSpaceForVersionString);
     return false;
   }
   int numberOfBytesRead;
   this.MetadataHeader.VersionString = memReader.PeekUTF8NullTerminated(0, out numberOfBytesRead);
   memReader.SkipBytes(this.MetadataHeader.VersionStringSize);
   return true;
 }

 internal MethodIL/*?*/ GetMethodIL(
   uint methodDefRowId
 ) {
   MethodRow methodRow = this.MethodTable[methodDefRowId];
   if (
     (methodRow.ImplFlags & MethodImplFlags.CodeTypeMask) != MethodImplFlags.ILCodeType
     || methodRow.RVA == 0
   ) {
     return null;
   }
   MemoryBlock memBlock = this.RVAToMemoryBlock(methodRow.RVA);
   //  Error need to check if the Memory Block is empty. This is calse for all the calls...
   MemoryReader memReader = new MemoryReader(memBlock);
   byte headByte = memReader.ReadByte();
   if ((headByte & CILMethodFlags.ILFormatMask) == CILMethodFlags.ILTinyFormat) {
     int size = headByte >> CILMethodFlags.ILTinyFormatSizeShift;
     return new MethodIL(
       true,
       8,
       0x00000000,
       memReader.GetMemoryBlockAt(0, size),
       null
     );
   } else if ((headByte & CILMethodFlags.ILFormatMask) != CILMethodFlags.ILFatFormat) {
     //  PEFileFormat Error...
     return null;
   }
   //  FatILFormat
   byte headByte2 = memReader.ReadByte();
   if ((headByte2 >> CILMethodFlags.ILFatFormatHeaderSizeShift) != CILMethodFlags.ILFatFormatHeaderSize) {
     //  PEFile Format Error...
     return null;
   }
   bool localVarInited = (headByte & CILMethodFlags.ILInitLocals) == CILMethodFlags.ILInitLocals;
   bool moreSectsPresent = (headByte & CILMethodFlags.ILMoreSects) == CILMethodFlags.ILMoreSects;
   ushort maxStack = memReader.ReadUInt16();
   int codeSize = memReader.ReadInt32();
   uint localSignatureToken = memReader.ReadUInt32();
   MemoryBlock ilCodeMemBlock = memReader.GetMemoryBlockAt(0, codeSize);
   SEHTableEntry[]/*?*/ sehTableEntries = null;
   if (moreSectsPresent) {
     memReader.SkipBytes(codeSize);
     memReader.Align(4);
     byte sectHeader = memReader.ReadByte();
     if ((sectHeader & CILMethodFlags.SectEHTable) != CILMethodFlags.SectEHTable) {
       //  PEFile Format Error...
       return null;
     }
     bool sectFatFormat = (sectHeader & CILMethodFlags.SectFatFormat) == CILMethodFlags.SectFatFormat;
     int dataSize = memReader.ReadByte();
     if (sectFatFormat) {
       dataSize += (int)memReader.ReadUInt16() << 8;
       sehTableEntries = PEFileReader.GetFatSEHEntries(memReader, dataSize / 24);
     } else {
       memReader.SkipBytes(2); //skip over reserved field
       sehTableEntries = PEFileReader.GetSmallSEHEntries(memReader, dataSize / 12);
     }
   }
   return new MethodIL(
     localVarInited,
     maxStack,
     localSignatureToken,
     ilCodeMemBlock,
     sehTableEntries
   );
 }

    private PEFileDebugInformation ReadDebugInformationLocationFromDebugTableDirectoryData() {
      if (this.OptionalHeaderDirectoryEntries.DebugTableDirectory.Size != 0x1c) return new PEFileDebugInformation();
      var debugDirectoryReader = new MemoryReader(this.DirectoryToMemoryBlock(this.OptionalHeaderDirectoryEntries.DebugTableDirectory));
      PeDebugDirectory debugDir = new PeDebugDirectory();
      debugDir.Characteristics = debugDirectoryReader.ReadUInt32();
      debugDir.TimeDateStamp = debugDirectoryReader.ReadUInt32();
      debugDir.MajorVersion = debugDirectoryReader.ReadUInt16();
      debugDir.MinorVersion = debugDirectoryReader.ReadUInt16();
      debugDir.Type = debugDirectoryReader.ReadUInt32();
      debugDir.SizeOfData = debugDirectoryReader.ReadUInt32();
      debugDir.AddressOfRawData = debugDirectoryReader.ReadUInt32();
      debugDir.PointerToRawData = debugDirectoryReader.ReadUInt32();
      if (debugDir.SizeOfData == 0) return new PEFileDebugInformation();
      var dataBlock = new MemoryBlock(this.BinaryDocumentMemoryBlock.Pointer + debugDir.PointerToRawData, debugDir.SizeOfData);
      var ptrToDebugInfo = this.BinaryDocumentMemoryBlock.Pointer + debugDir.PointerToRawData;
      var ptrToDebugInfoEnd = this.BinaryDocumentMemoryBlock.Pointer + debugDir.PointerToRawData + debugDir.SizeOfData;
      if (ptrToDebugInfo >= this.BinaryDocumentMemoryBlock.Pointer + this.BinaryDocumentMemoryBlock.Length - 28) {
        //TODO: error
        return new PEFileDebugInformation();
      }
      if (ptrToDebugInfoEnd > this.BinaryDocumentMemoryBlock.Pointer + this.BinaryDocumentMemoryBlock.Length) {
        //TODO: error
        return new PEFileDebugInformation();
      }
      var debugDataReader = new MemoryReader(dataBlock);
      var magic = debugDataReader.ReadUInt32();
      if (magic != 0x53445352) { //RSDS in little endian format
        //TODO: error
        return new PEFileDebugInformation();
      }

      var guid = debugDataReader.PeekGuid(0);
      debugDataReader.SkipBytes(16);
      UInt32 age = debugDataReader.ReadUInt32();
      string fileName = debugDataReader.ReadASCIINullTerminated();

      var guidHex = guid.ToString("N");
      string ageHex = age.ToString("X");
      string version = guidHex + ageHex;

      PEFileDebugInformation information = new PEFileDebugInformation();
      information.Signature = guid;
      information.Age = age;
      information.PdbVersion = version;
      information.PdbFileName = fileName;
      return information;
    }