/
cbor_message.go
199 lines (160 loc) · 4.1 KB
/
cbor_message.go
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// Code adapted from original generated by github.com/whyrusleeping/cbor-gen.
// This adapted code allows for an optional OrigPeer field.
//
// TODO: Convert Message into IPLD schema and use bindnode for serialization.
package message
import (
"fmt"
"io"
cbg "github.com/whyrusleeping/cbor-gen"
)
func (m *Message) MarshalCBOR(w io.Writer) error {
var err error
if m == nil {
_, err = w.Write(cbg.CborNull)
return err
}
var lengthBufMessage []byte
if m.OrigPeer == "" {
lengthBufMessage = []byte{131}
} else {
lengthBufMessage = []byte{132}
}
if _, err = w.Write(lengthBufMessage); err != nil {
return err
}
scratch := make([]byte, 9)
// Encode m.Cid.
if err = cbg.WriteCidBuf(scratch, w, m.Cid); err != nil {
return fmt.Errorf("failed to write cid field m.Cid: %w", err)
}
// Encode m.Addrs.
if len(m.Addrs) > cbg.MaxLength {
return fmt.Errorf("slice value in field m.Addrs was too long")
}
if err = cbg.WriteMajorTypeHeaderBuf(scratch, w, cbg.MajArray, uint64(len(m.Addrs))); err != nil {
return err
}
for _, v := range m.Addrs {
if len(v) > cbg.ByteArrayMaxLen {
return fmt.Errorf("byte array in field v was too long")
}
if err = cbg.WriteMajorTypeHeaderBuf(scratch, w, cbg.MajByteString, uint64(len(v))); err != nil {
return err
}
if _, err = w.Write(v[:]); err != nil {
return err
}
}
if len(m.ExtraData) > cbg.ByteArrayMaxLen {
return fmt.Errorf("byte array in field m.ExtraData was too long")
}
if err = cbg.WriteMajorTypeHeaderBuf(scratch, w, cbg.MajByteString, uint64(len(m.ExtraData))); err != nil {
return err
}
if _, err = w.Write(m.ExtraData[:]); err != nil {
return err
}
// OrigPeer is empty so do not encode it.
if len(m.OrigPeer) == 0 {
return nil
}
// Encode m.OrigPeer.
if len(m.OrigPeer) > cbg.MaxLength {
return fmt.Errorf("value in field m.OrigPeer was too long")
}
if err = cbg.WriteMajorTypeHeaderBuf(scratch, w, cbg.MajTextString, uint64(len(m.OrigPeer))); err != nil {
return err
}
if _, err = io.WriteString(w, string(m.OrigPeer)); err != nil {
return err
}
return nil
}
func (m *Message) UnmarshalCBOR(r io.Reader) error {
*m = Message{}
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 > 4 {
return fmt.Errorf("cbor input had too many fields")
}
if extra < 3 {
return fmt.Errorf("cbor input had too few fields")
}
var hasOrigPeer bool
if extra == 4 {
hasOrigPeer = true
}
// Decode m.Cid.
m.Cid, err = cbg.ReadCid(br)
if err != nil {
return fmt.Errorf("failed to read cid field m.Cid: %w", err)
}
// Decode m.Addrs.
maj, extra, err = cbg.CborReadHeaderBuf(br, scratch)
if err != nil {
return err
}
if extra > cbg.MaxLength {
return fmt.Errorf("m.Addrs: array too large (%d)", extra)
}
if maj != cbg.MajArray {
return fmt.Errorf("expected cbor array")
}
if extra > 0 {
m.Addrs = make([][]uint8, extra)
}
for i := 0; i < int(extra); i++ {
maj, extra, err := cbg.CborReadHeaderBuf(br, scratch)
if err != nil {
return err
}
if extra > cbg.ByteArrayMaxLen {
return fmt.Errorf("byte array too large (%d) for Addrs[%d]", extra, i)
}
if maj != cbg.MajByteString {
return fmt.Errorf("expected byte array")
}
if extra > 0 {
m.Addrs[i] = make([]uint8, extra)
}
if _, err = io.ReadFull(br, m.Addrs[i][:]); err != nil {
return err
}
}
// Decode m.ExtraData.
maj, extra, err = cbg.CborReadHeaderBuf(br, scratch)
if err != nil {
return err
}
if extra > cbg.ByteArrayMaxLen {
return fmt.Errorf("byte array too large (%d) for ExtraData", extra)
}
if maj != cbg.MajByteString {
return fmt.Errorf("expected byte array")
}
if extra > 0 {
m.ExtraData = make([]uint8, extra)
}
if _, err = io.ReadFull(br, m.ExtraData[:]); err != nil {
return err
}
// OrigPeer field does not exist, so nothing more to do.
if !hasOrigPeer {
return nil
}
// Decode m.OrigPeer.
sval, err := cbg.ReadString(br)
if err != nil {
return err
}
m.OrigPeer = string(sval)
return nil
}