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lz4.go
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lz4.go
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package lz4
import (
"bytes"
"github.com/pierrec/lz4"
kafka "github.com/segmentio/kafka-go"
)
func init() {
kafka.RegisterCompressionCodec(func() kafka.CompressionCodec {
return NewCompressionCodec()
})
}
type CompressionCodec struct {
writer *lz4.Writer
reader *lz4.Reader
}
const Code = 3
func NewCompressionCodec() CompressionCodec {
return CompressionCodec{}
}
// Code implements the kafka.CompressionCodec interface.
func (c CompressionCodec) Code() int8 {
return Code
}
// Encode implements the kafka.CompressionCodec interface.
func (c CompressionCodec) Encode(dst, src []byte) (int, error) {
buf := buffer{data: dst}
if c.writer == nil {
c.writer = lz4.NewWriter(&buf)
} else {
c.writer.Reset(&buf)
}
_, err := c.writer.Write(src)
if err != nil {
return 0, err
}
err = c.writer.Close()
if err != nil {
return 0, err
}
return buf.size, err
}
// Decode implements the kafka.CompressionCodec interface.
func (c CompressionCodec) Decode(dst, src []byte) (int, error) {
if c.reader == nil {
c.reader = lz4.NewReader(bytes.NewReader(src))
} else {
c.reader.Reset(bytes.NewReader(src))
}
return c.reader.Read(dst)
}
type buffer struct {
data []byte
size int
}
func (buf *buffer) Write(b []byte) (int, error) {
n := copy(buf.data[buf.size:], b)
buf.size += n
if n != len(b) {
return n, bytes.ErrTooLarge
}
return n, nil
}