GetStream() private method

private GetStream ( ) : Stream
return Stream
		internal MethodBody(ModuleReader module, int rva, IGenericContext context)
		{
			const byte CorILMethod_TinyFormat = 0x02;
			const byte CorILMethod_FatFormat = 0x03;
			const byte CorILMethod_MoreSects = 0x08;
			const byte CorILMethod_InitLocals = 0x10;
			const byte CorILMethod_Sect_EHTable = 0x01;
			const byte CorILMethod_Sect_FatFormat = 0x40;
			const byte CorILMethod_Sect_MoreSects = 0x80;

			List<ExceptionHandlingClause> exceptionClauses = new List<ExceptionHandlingClause>();
			List<LocalVariableInfo> locals = new List<LocalVariableInfo>();
			Stream stream = module.GetStream();
			module.SeekRVA(rva);
			BinaryReader br = new BinaryReader(stream);
			byte b = br.ReadByte();
			if ((b & 3) == CorILMethod_TinyFormat)
			{
				initLocals = true;
				body = br.ReadBytes(b >> 2);
				maxStack = 8;
			}
			else if ((b & 3) == CorILMethod_FatFormat)
			{
				initLocals = (b & CorILMethod_InitLocals) != 0;
				short flagsAndSize = (short)(b | (br.ReadByte() << 8));
				if ((flagsAndSize >> 12) != 3)
				{
					throw new BadImageFormatException("Fat format method header size should be 3");
				}
				maxStack = br.ReadUInt16();
				int codeLength = br.ReadInt32();
				localVarSigTok = br.ReadInt32();
				body = br.ReadBytes(codeLength);
				if ((b & CorILMethod_MoreSects) != 0)
				{
					stream.Position = (stream.Position + 3) & ~3;
					int hdr = br.ReadInt32();
					if ((hdr & CorILMethod_Sect_MoreSects) != 0 || (hdr & CorILMethod_Sect_EHTable) == 0)
					{
						throw new NotImplementedException();
					}
					else if ((hdr & CorILMethod_Sect_FatFormat) != 0)
					{
						int count = ComputeExceptionCount((hdr >> 8) & 0xFFFFFF, 24);
						for (int i = 0; i < count; i++)
						{
							int flags = br.ReadInt32();
							int tryOffset = br.ReadInt32();
							int tryLength = br.ReadInt32();
							int handlerOffset = br.ReadInt32();
							int handlerLength = br.ReadInt32();
							int classTokenOrFilterOffset = br.ReadInt32();
							exceptionClauses.Add(new ExceptionHandlingClause(module, flags, tryOffset, tryLength, handlerOffset, handlerLength, classTokenOrFilterOffset, context));
						}
					}
					else
					{
						int count = ComputeExceptionCount((hdr >> 8) & 0xFF, 12);
						for (int i = 0; i < count; i++)
						{
							int flags = br.ReadUInt16();
							int tryOffset = br.ReadUInt16();
							int tryLength = br.ReadByte();
							int handlerOffset = br.ReadUInt16();
							int handlerLength = br.ReadByte();
							int classTokenOrFilterOffset = br.ReadInt32();
							exceptionClauses.Add(new ExceptionHandlingClause(module, flags, tryOffset, tryLength, handlerOffset, handlerLength, classTokenOrFilterOffset, context));
						}
					}
				}
				if (localVarSigTok != 0)
				{
					ByteReader sig = module.GetStandAloneSig((localVarSigTok & 0xFFFFFF) - 1);
					Signature.ReadLocalVarSig(module, sig, context, locals);
				}
			}
			else
			{
				throw new BadImageFormatException();
			}
			this.exceptionClauses = exceptionClauses.AsReadOnly();
			this.locals = locals.AsReadOnly();
		}