package sarama import ( "encoding/binary" "github.com/klauspost/crc32" ) // crc32Field implements the pushEncoder and pushDecoder interfaces for calculating CRC32s. type crc32Field struct { startOffset int } func (c *crc32Field) saveOffset(in int) { c.startOffset = in } func (c *crc32Field) reserveLength() int { return 4 } func (c *crc32Field) run(curOffset int, buf []byte) error { crc := crc32.ChecksumIEEE(buf[c.startOffset+4 : curOffset]) binary.BigEndian.PutUint32(buf[c.startOffset:], crc) return nil } func (c *crc32Field) check(curOffset int, buf []byte) error { crc := crc32.ChecksumIEEE(buf[c.startOffset+4 : curOffset]) if crc != binary.BigEndian.Uint32(buf[c.startOffset:]) { return PacketDecodingError{"CRC didn't match"} } return nil }