You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
82 lines
1.8 KiB
82 lines
1.8 KiB
package sarama |
|
|
|
import "encoding/binary" |
|
|
|
// LengthField implements the PushEncoder and PushDecoder interfaces for calculating 4-byte lengths. |
|
type lengthField struct { |
|
startOffset int |
|
length int32 |
|
} |
|
|
|
func (l *lengthField) decode(pd packetDecoder) error { |
|
var err error |
|
l.length, err = pd.getInt32() |
|
if err != nil { |
|
return err |
|
} |
|
if l.length > int32(pd.remaining()) { |
|
return ErrInsufficientData |
|
} |
|
return nil |
|
} |
|
|
|
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 int32(curOffset-l.startOffset-4) != l.length { |
|
return PacketDecodingError{"length field invalid"} |
|
} |
|
|
|
return nil |
|
} |
|
|
|
type varintLengthField struct { |
|
startOffset int |
|
length int64 |
|
} |
|
|
|
func (l *varintLengthField) decode(pd packetDecoder) error { |
|
var err error |
|
l.length, err = pd.getVarint() |
|
return err |
|
} |
|
|
|
func (l *varintLengthField) saveOffset(in int) { |
|
l.startOffset = in |
|
} |
|
|
|
func (l *varintLengthField) adjustLength(currOffset int) int { |
|
oldFieldSize := l.reserveLength() |
|
l.length = int64(currOffset - l.startOffset - oldFieldSize) |
|
|
|
return l.reserveLength() - oldFieldSize |
|
} |
|
|
|
func (l *varintLengthField) reserveLength() int { |
|
var tmp [binary.MaxVarintLen64]byte |
|
return binary.PutVarint(tmp[:], l.length) |
|
} |
|
|
|
func (l *varintLengthField) run(curOffset int, buf []byte) error { |
|
binary.PutVarint(buf[l.startOffset:], l.length) |
|
return nil |
|
} |
|
|
|
func (l *varintLengthField) check(curOffset int, buf []byte) error { |
|
if int64(curOffset-l.startOffset-l.reserveLength()) != l.length { |
|
return PacketDecodingError{"length field invalid"} |
|
} |
|
|
|
return nil |
|
}
|
|
|