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cbor.go
132 lines (108 loc) · 2.54 KB
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cbor.go
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package backupds
import (
"fmt"
"io"
cbg "github.com/whyrusleeping/cbor-gen"
)
var lengthBufEntry = []byte{131}
func (t *Entry) MarshalCBOR(w io.Writer) error {
if t == nil {
_, err := w.Write(cbg.CborNull)
return err
}
if _, err := w.Write(lengthBufEntry); err != nil {
return err
}
scratch := make([]byte, 9)
if err := cbg.WriteMajorTypeHeaderBuf(scratch, w, cbg.MajByteString, uint64(len(t.Key))); err != nil {
return err
}
if _, err := w.Write(t.Key[:]); err != nil {
return err
}
if err := cbg.WriteMajorTypeHeaderBuf(scratch, w, cbg.MajByteString, uint64(len(t.Value))); err != nil {
return err
}
if _, err := w.Write(t.Value[:]); err != nil {
return err
}
// t.Timestamp (int64) (int64)
if t.Timestamp >= 0 {
if err := cbg.WriteMajorTypeHeaderBuf(scratch, w, cbg.MajUnsignedInt, uint64(t.Timestamp)); err != nil {
return err
}
} else {
if err := cbg.WriteMajorTypeHeaderBuf(scratch, w, cbg.MajNegativeInt, uint64(-t.Timestamp-1)); err != nil {
return err
}
}
return nil
}
func (t *Entry) UnmarshalCBOR(r io.Reader) error {
*t = Entry{}
br := cbg.GetPeeker(r)
scratch := make([]byte, 8)
maj, extra, err := cbg.CborReadHeaderBuf(br, scratch)
if err != nil {
return err
}
if maj != cbg.MajArray {
return fmt.Errorf("cbor input should be of type array")
}
if extra != 3 {
return fmt.Errorf("cbor input had wrong number of fields")
}
// t.Key ([]uint8) (slice)
maj, extra, err = cbg.CborReadHeaderBuf(br, scratch)
if err != nil {
return err
}
if maj != cbg.MajByteString {
return fmt.Errorf("expected byte array")
}
if extra > 0 {
t.Key = make([]uint8, extra)
}
if _, err := io.ReadFull(br, t.Key[:]); err != nil {
return err
}
// t.Value ([]uint8) (slice)
maj, extra, err = cbg.CborReadHeaderBuf(br, scratch)
if err != nil {
return err
}
if maj != cbg.MajByteString {
return fmt.Errorf("expected byte array")
}
if extra > 0 {
t.Value = make([]uint8, extra)
}
if _, err := io.ReadFull(br, t.Value[:]); err != nil {
return err
}
// t.Timestamp (int64) (int64)
{
maj, extra, err := cbg.CborReadHeaderBuf(br, scratch)
var extraI int64
if err != nil {
return err
}
switch maj {
case cbg.MajUnsignedInt:
extraI = int64(extra)
if extraI < 0 {
return fmt.Errorf("int64 positive overflow")
}
case cbg.MajNegativeInt:
extraI = int64(extra)
if extraI < 0 {
return fmt.Errorf("int64 negative oveflow")
}
extraI = -1 - extraI
default:
return fmt.Errorf("wrong type for int64 field: %d", maj)
}
t.Timestamp = extraI
}
return nil
}