Golang BinaryReader.ReadInterface方法代码示例

func (a *attribute_info) String(c *ConstantPool) (ret string) {
	ret = c.Lut(a.Attribute_name_index).String()
	switch n := c.Lut(a.Attribute_name_index).String(); n {
	case "Signature", "SourceFile":
		ret += "="
		br := util.BinaryReader{bytes.NewReader(a.Info), util.BigEndian}
		if i16, err := br.Uint16(); err != nil {
			ret += err.Error()
		} else {
			ret += c.Lut(u2(i16)).String()
		}
	case "Code":
		ret += " ("
		var cl Code_attribute
		br := util.BinaryReader{bytes.NewReader(a.Info), util.BigEndian}
		if err := br.ReadInterface(&cl); err != nil {
			ret += err.Error()
		} else {
			for _, a2 := range cl.Attributes {
				ret += fmt.Sprintf(" %s", c.Lut(a2.Attribute_name_index))
			}
		}
		ret += " )"
	}
	return ret
}

func NewClass(reader io.ReadSeeker) (*Class, error) {
	r := util.BinaryReader{reader, binary.BigEndian}
	var c Class
	if err := r.ReadInterface(&c); err != nil {
		return nil, err
	} else if c.Magic != magic {
		return nil, errors.New(fmt.Sprintf("Magic isn't what's expected: %x", c.Magic))
	}
	return &c, nil
}

func (c *ConstantPool) Read(br *util.BinaryReader) error {
	var count uint16
	if err := br.ReadInterface(&count); err != nil {
		return err
	} else {
		ic := int(count)
		ic--
		c.constants = make([]Constant, ic, ic)

		for i := 0; i < len(c.constants); i++ {
			cc := &c.constants[i]
			cc.cp = c
			if err := c.readConstant(cc, br); err != nil {
				return err
			}

			if cc.Tag == CONSTANT_Double || cc.Tag == CONSTANT_Long {
				// All 8-byte constants take up two entries in the constant_pool table of the class file.
				i++
			}
		}
	}
	return nil
}

func LoadAssembly(r io.ReadSeeker) (*Assembly, error) {

	var (
		br        = util.BinaryReader{r, binary.LittleEndian}
		err       error
		pe_offset uint32
		coff      coff_file_header
		cor20     image_cor20
		t         MetadataHeader
	)

	if _, err := r.Seek(pe_signature_offset, 0); err != nil {
		return nil, err
	}

	if pe_offset, err = br.Uint32(); err != nil {
		return nil, err
	} else if _, err := r.Seek(int64(pe_offset), 0); err != nil {
		return nil, err
	}

	if err := br.ReadInterface(&coff); err != nil {
		return nil, err
	}
	net := coff.OptionalHeader.RVAS[14]
	off := coff.VirtualToFileOffset(net.VirtualAddress)
	if _, err := br.Seek(int64(off), 0); err != nil {
		return nil, err
	}

	if err := br.ReadInterface(&cor20); err != nil {
		return nil, err
	}
	off = coff.VirtualToFileOffset(cor20.MetaData.VirtualAddress)
	if _, err := br.Seek(int64(off), 0); err != nil {
		return nil, err
	}
	if err := br.ReadInterface(&t); err != nil {
		return nil, err
	}
	if _, err := br.Seek(int64(off), 0); err != nil {
		return nil, err
	}
	if md, err := t.MetadataUtil(&br); err != nil {
		return nil, err
	} else {
		return &Assembly{*md}, nil
	}
}

func (m *MetadataUtil) Create(br *util.BinaryReader, v interface{}) error {
	t := reflect.ValueOf(v)
	if t.Kind() != reflect.Ptr {
		return errors.New(fmt.Sprintf("Expected a pointer not %s", t.Kind()))
	}
	v2 := t.Elem()
	name := v2.Type().Name()

	if name == "StringIndex" {
		size := m.StringHeap.RowSize
		index, err := m.ReadIndex(br, uint(size))
		if err != nil {
			return err
		}
		data := m.StringHeap.data[index:m.StringHeap.Rows]

		for i := range data {
			if data[i] == '\u0000' {
				data = data[:i]
				break
			}
		}
		v2.SetString(string(data))
	} else if name == "Guid" {
		size := m.GuidHeap.RowSize
		if index, err := m.ReadIndex(br, uint(size)); err != nil {
			return err
		} else if index != 0 {
			index = (index - 1) * 16
			g := Guid(m.GuidHeap.data[index : index+16])
			v2.Set(reflect.ValueOf(g))
		}
	} else if strings.HasSuffix(name, "EncodedIndex") {
		if size, err := m.Size(v2.Type()); err != nil {
			return err
		} else {
			idx, err := m.ReadIndex(br, size)
			if err != nil {
				return err
			}
			var (
				tables = enc_lut[idx_name_lut[name]]
				b      = util.Bits(len(tables))
				mask   = uint32(0xffff << b)
				tbl    = idx &^ mask
				ti     ConcreteTableIndex
			)
			idx = idx >> b
			ti.index = idx
			ti.table = tables[int(tbl)]
			ti.metadataUtil = m
			v2.Set(reflect.ValueOf(&ti))
		}
	} else if strings.HasSuffix(name, "Index") {
		if size, err := m.Size(v2.Type()); err != nil {
			return err
		} else {
			var ti ConcreteTableIndex
			if ti.index, err = m.ReadIndex(br, size); err != nil {
				return err
			}
			if name == "BlobIndex" {
				ti.table = id_Blob
			} else {
				ti.table = idx_name_lut[name]
			}
			ti.metadataUtil = m
			v2.Set(reflect.ValueOf(&ti))
		}
	} else {
		switch v2.Kind() {
		case reflect.Struct:
			for i := 0; i < v2.NumField(); i++ {
				f := v2.Field(i)
				a := f.Addr()
				if err := m.Create(br, a.Interface()); err != nil {
					return err
				}
			}
		default:
			return br.ReadInterface(v)
		}
	}
	return nil
}

func (mh *MetadataHeader) MetadataUtil(br *util.BinaryReader) (*MetadataUtil, error) {
	var (
		ret MetadataUtil
	)

	off, err := br.Seek(0, 1)
	if err != nil {
		return nil, err
	}
	base := off
	for _, h := range mh.StreamHeaders {
		switch h.Name {
		case "#~":
			off += int64(h.Offset)
		case "#Strings":
			if _, err := br.Seek(base+int64(h.Offset), 0); err != nil {
				return nil, err
			} else if ret.StringHeap.data, err = br.Read(int(h.Size)); err != nil {
				return nil, err
			}
			ret.StringHeap.Rows = h.Size
		case "#Blob":
			if _, err := br.Seek(base+int64(h.Offset), 0); err != nil {
				return nil, err
			} else if ret.BlobHeap.data, err = br.Read(int(h.Size)); err != nil {
				return nil, err
			}
			ret.BlobHeap.Rows = h.Size
		case "#GUID":
			if _, err := br.Seek(base+int64(h.Offset), 0); err != nil {
				return nil, err
			} else if ret.GuidHeap.data, err = br.Read(int(h.Size)); err != nil {
				return nil, err
			}
			ret.GuidHeap.Rows = h.Size
		}
	}
	if _, err := br.Seek(off, 0); err != nil {
		return nil, err
	}
	h := hash_tilde_stream_header{}
	if err := br.ReadInterface(&h); err != nil {
		return nil, err
	}

	if h.HeapSizes&bit_stringHeapIndexSize != 0 {
		ret.StringHeap.RowSize = 4
	} else {
		ret.StringHeap.RowSize = 2
	}
	if h.HeapSizes&bit_blobHeapIndexSize != 0 {
		ret.BlobHeap.RowSize = 4
	} else {
		ret.BlobHeap.RowSize = 2
	}
	if h.HeapSizes&bit_guidHeapIndexSize != 0 {
		ret.GuidHeap.RowSize = 4
	} else {
		ret.GuidHeap.RowSize = 2
	}

	for i := range ret.Tables {
		if valid := (h.Valid >> uint(i)) & 1; valid != 0 {
			if ret.Tables[i].Rows, err = br.Uint32(); err != nil {
				return nil, err
			}
			ret.Tables[i].RowType = table_row_type_lut[i]
		}
	}

	for i := range ret.Tables {
		if ret.Tables[i].Rows != 0 {
			if size, err := ret.Size(ret.Tables[i].RowType); err != nil {
				return nil, err
			} else {
				ret.Tables[i].RowSize = uint32(size)
				if ret.Tables[i].data, err = br.Read(int(ret.Tables[i].RowSize * ret.Tables[i].Rows)); err != nil {
					return nil, err
				}
			}
		}
	}
	return &ret, nil
}

func (cp *ConstantPool) readConstant(c *Constant, br *util.BinaryReader) error {
	if err := br.ReadInterface(&c.Tag); err != nil {
		return err
	} else {
		switch c.Tag {
		case CONSTANT_String:
			fallthrough
		case CONSTANT_MethodType:
			fallthrough
		case CONSTANT_Class:
			return br.ReadInterface(&c.Index[0])
		case CONSTANT_Fieldref:
			fallthrough
		case CONSTANT_Methodref:
			fallthrough
		case CONSTANT_NameAndType:
			fallthrough
		case CONSTANT_InvokeDynamic:
			fallthrough
		case CONSTANT_InterfaceMethodref:
			if err := br.ReadInterface(&c.Index[0]); err != nil {
				return err
			} else {
				return br.ReadInterface(&c.Index[1])
			}
		case CONSTANT_Integer:
			var v int32
			return br.ReadInterface(&v)
		case CONSTANT_Float:
			var v float32
			return br.ReadInterface(&v)
		case CONSTANT_Long:
			var v int64
			return br.ReadInterface(&v)
		case CONSTANT_Double:
			var v float64
			return br.ReadInterface(&v)
		case CONSTANT_Utf8:
			var length u2
			if err := br.ReadInterface(&length); err != nil {
				return err
			} else if d, err := br.Read(int(length)); err != nil {
				return err
			} else {
				c.Value = string(d)
			}
		case CONSTANT_MethodHandle:
			var ref_kind u1
			if err := br.ReadInterface(&ref_kind); err != nil {
				return err
			} else {
				c.Index[0] = u2(ref_kind)
				return br.ReadInterface(&c.Index[1])
			}
		default:
			return errors.New(fmt.Sprintf("Unimplemented tag: %d", c.Tag))
		}
	}
	return nil
}