github.com/deanMdreon/kafka-go@v0.4.32/crc32.go (about)

     1  package kafka
     2  
     3  import (
     4  	"encoding/binary"
     5  	"hash/crc32"
     6  )
     7  
     8  type crc32Writer struct {
     9  	table  *crc32.Table
    10  	buffer [8]byte
    11  	crc32  uint32
    12  }
    13  
    14  func (w *crc32Writer) update(b []byte) {
    15  	w.crc32 = crc32.Update(w.crc32, w.table, b)
    16  }
    17  
    18  func (w *crc32Writer) writeInt8(i int8) {
    19  	w.buffer[0] = byte(i)
    20  	w.update(w.buffer[:1])
    21  }
    22  
    23  func (w *crc32Writer) writeInt16(i int16) {
    24  	binary.BigEndian.PutUint16(w.buffer[:2], uint16(i))
    25  	w.update(w.buffer[:2])
    26  }
    27  
    28  func (w *crc32Writer) writeInt32(i int32) {
    29  	binary.BigEndian.PutUint32(w.buffer[:4], uint32(i))
    30  	w.update(w.buffer[:4])
    31  }
    32  
    33  func (w *crc32Writer) writeInt64(i int64) {
    34  	binary.BigEndian.PutUint64(w.buffer[:8], uint64(i))
    35  	w.update(w.buffer[:8])
    36  }
    37  
    38  func (w *crc32Writer) writeBytes(b []byte) {
    39  	n := len(b)
    40  	if b == nil {
    41  		n = -1
    42  	}
    43  	w.writeInt32(int32(n))
    44  	w.update(b)
    45  }
    46  
    47  func (w *crc32Writer) Write(b []byte) (int, error) {
    48  	w.update(b)
    49  	return len(b), nil
    50  }
    51  
    52  func (w *crc32Writer) WriteString(s string) (int, error) {
    53  	w.update([]byte(s))
    54  	return len(s), nil
    55  }