Function structEncodeFuncOf

proto/struct.go:214–286

(t reflect.Type, fields []structField)

}

func structEncodeFuncOf(t reflect.Type, fields []structField) encodeFunc {
	inlined := inlined(t)
	var unique, repeated []*structField

	for i := range fields {
		f := &fields[i]
		if f.repeated() {
			repeated = append(repeated, f)
		} else {
			unique = append(unique, f)
		}
	}

	return func(b []byte, p unsafe.Pointer, flags flags) (int, error) {
		if p == nil {
			return 0, nil
		}

		if !inlined {
			flags = flags.without(inline | toplevel)
		} else {
			flags = flags.without(toplevel)
		}
		offset := 0

		for _, f := range unique {
			fieldFlags := f.makeFlags(flags)
			elem := f.pointer(p)
			size := f.codec.size(elem, fieldFlags)

			if size > 0 {
				n, err := encodeTag(b[offset:], f.fieldNumber(), f.wireType())
				offset += n
				if err != nil {
					return offset, err
				}

				if f.embedded() {
					n, err := encodeVarint(b[offset:], uint64(size))
					offset += n
					if err != nil {
						return offset, err
					}
				}

				if (len(b) - offset) < size {
					return len(b), io.ErrShortBuffer
				}

				n, err = f.codec.encode(b[offset:offset+size], elem, fieldFlags)
				offset += n
				if err != nil {
					return offset, err
				}

				flags = flags.without(wantzero)
			}
		}