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multicodec.go
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/
multicodec.go
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package multi
import (
"fmt"
"github.com/multiformats/go-multicodec"
"github.com/multiformats/go-varint"
)
func MulticodecEncode(codec multicodec.Code, payload []byte) ([]byte, error) {
c := uint64(codec)
codecBytes := varint.ToUvarint(c)
encoded := append(codecBytes, payload...)
return encoded, nil
}
// Returns the codec, payload and error of a multicodec encoded byte array
func MulticodecDecode(encoded []byte) (multicodec.Code, []byte, error) {
var codec multicodec.Code
if len(encoded) < 1 {
return codec, nil, ErrNoInput
}
// log.Debugf("mutlticodecdecode: encoded: %x", encoded)
code, n, err := varint.FromUvarint(encoded)
if err != nil {
return codec, nil, fmt.Errorf("error decoding varint: %w", err)
}
if n < 1 || n >= len(encoded) {
return codec, nil, ErrInvalidSize
}
codec = multicodec.Code(code)
if codec == 0 {
return codec, nil, ErrUnknownCodec
}
return codec, encoded[n:], nil
}