traefik/vendor/github.com/Shopify/sarama/length_field.go

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2018-01-10 16:48:04 +00:00
package sarama
import "encoding/binary"
// LengthField implements the PushEncoder and PushDecoder interfaces for calculating 4-byte lengths.
type lengthField struct {
startOffset int
}
func (l *lengthField) saveOffset(in int) {
l.startOffset = in
}
func (l *lengthField) reserveLength() int {
return 4
}
func (l *lengthField) run(curOffset int, buf []byte) error {
binary.BigEndian.PutUint32(buf[l.startOffset:], uint32(curOffset-l.startOffset-4))
return nil
}
func (l *lengthField) check(curOffset int, buf []byte) error {
if uint32(curOffset-l.startOffset-4) != binary.BigEndian.Uint32(buf[l.startOffset:]) {
return PacketDecodingError{"length field invalid"}
}
return nil
}