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package errors
import (
"encoding/binary"
"log"
)
func (e *Error) MarshalAppend(b []byte) []byte {
if e == nil {
return b
}
b = appendString(b, string(e.Op))
var tmp [16]byte
N := binary.PutVarint(tmp[:], int64(e.Kind))
b = append(b, tmp[:N]...)
b = MarshalErrorAppend(e.Err, b)
return b
}
func (e *Error) MarshalBinary() ([]byte, error) {
return e.MarshalAppend(nil), nil
}
func MarshalErrorAppend(err error, b []byte) []byte {
if err == nil {
return b
}
if e, ok := err.(*Error); ok {
b = append(b, 'E')
return e.MarshalAppend(b)
}
// Ordinary error.
b = append(b, 'e')
b = appendString(b, err.Error())
return b
}
func MarshalError(err error) []byte {
return MarshalErrorAppend(err, nil)
}
func (e *Error) UnmarshalBinary(b []byte) error {
if len(b) == 0 {
return nil
}
data, b := getBytes(b)
if data != nil {
e.Op = Op(data)
}
k, N := binary.Varint(b)
e.Kind = Kind(k)
b = b[N:]
e.Err = UnmarshalError(b)
return nil
}
func UnmarshalError(b []byte) error {
if len(b) == 0 {
return nil
}
code := b[0]
b = b[1:]
switch code {
case 'e':
var data []byte
data, b = getBytes(b)
if len(b) != 0 {
log.Printf("Unmarshal error: trailing bytes")
}
return Str(string(data))
case 'E':
var err Error
err.UnmarshalBinary(b)
return &err
default:
log.Printf("Unmarshal error: corrupt data %q", b)
return Str(string(b))
}
}
func appendString(b []byte, str string) []byte {
var tmp [16]byte
N := binary.PutUvarint(tmp[:], uint64(len(str)))
b = append(b, tmp[:N]...)
b = append(b, str...)
return b
}
func getBytes(b []byte) (data, remaining []byte) {
u, N := binary.Uvarint(b)
if len(b) < N+int(u) {
log.Printf("Unmarshal error: bad encoding")
return nil, nil
}
if N == 0 {
log.Printf("Unmarshal error: bad encoding")
return nil, b
}
return b[N : N+int(u)], b[N+int(u):]
}
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