mirror of https://github.com/tidwall/tile38.git
62 lines
1.4 KiB
Go
62 lines
1.4 KiB
Go
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package ndr
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import (
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"errors"
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"fmt"
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"reflect"
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"strconv"
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)
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// type MyBytes []byte
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// implement RawBytes interface
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const (
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sizeMethod = "Size"
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)
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// RawBytes interface should be implemented if reading just a number of bytes from the NDR stream
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type RawBytes interface {
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Size(interface{}) int
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}
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func rawBytesSize(parent reflect.Value, v reflect.Value) (int, error) {
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sf := v.MethodByName(sizeMethod)
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if !sf.IsValid() {
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return 0, fmt.Errorf("could not find a method called %s on the implementation of RawBytes", sizeMethod)
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}
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in := []reflect.Value{parent}
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f := sf.Call(in)
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if f[0].Kind() != reflect.Int {
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return 0, errors.New("the RawBytes size function did not return an integer")
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}
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return int(f[0].Int()), nil
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}
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func addSizeToTag(parent reflect.Value, v reflect.Value, tag reflect.StructTag) (reflect.StructTag, error) {
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size, err := rawBytesSize(parent, v)
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if err != nil {
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return tag, err
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}
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ndrTag := parseTags(tag)
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ndrTag.Map["size"] = strconv.Itoa(size)
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return ndrTag.StructTag(), nil
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}
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func (dec *Decoder) readRawBytes(v reflect.Value, tag reflect.StructTag) error {
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ndrTag := parseTags(tag)
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sizeStr, ok := ndrTag.Map["size"]
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if !ok {
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return errors.New("size tag not available")
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}
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size, err := strconv.Atoi(sizeStr)
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if err != nil {
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return fmt.Errorf("size not valid: %v", err)
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}
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b, err := dec.readBytes(size)
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if err != nil {
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return err
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}
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v.Set(reflect.ValueOf(b).Convert(v.Type()))
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return nil
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}
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