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snappy_gob_codec.go
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/
snappy_gob_codec.go
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// SPDX-License-Identifier: AGPL-3.0-only
package storegateway
import (
"bytes"
"encoding/gob"
"github.com/golang/snappy"
"github.com/pkg/errors"
)
const gobCodecPrefix = "gob:"
var snappyEncodingCheckFn = snappy.MaxEncodedLen
func encodeSnappyGob(value interface{}) ([]byte, error) {
buf := bytes.Buffer{}
buf.WriteString(gobCodecPrefix)
err := gob.NewEncoder(&buf).Encode(value)
if err != nil {
return nil, err
}
if maxEncodedLen := snappyEncodingCheckFn(len(buf.Bytes())); maxEncodedLen == -1 {
return nil, errors.New("data too large")
}
encoded := snappy.Encode(nil, buf.Bytes())
return encoded, nil
}
func decodeSnappyGob(input []byte, value interface{}) error {
decoded, err := snappy.Decode(nil, input)
if err != nil {
return errors.Wrap(err, "snappy decode")
}
if len(decoded) < len(gobCodecPrefix) || string(decoded[:len(gobCodecPrefix)]) != gobCodecPrefix {
return errors.New("no gob codec prefix")
}
decoder := gob.NewDecoder(bytes.NewBuffer(decoded[len(gobCodecPrefix):]))
if err := decoder.Decode(value); err != nil {
return errors.Wrap(err, "gob decode")
}
return nil
}