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compression.go
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compression.go
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package method
import (
"compress/flate"
"compress/gzip"
"git.golaxy.org/framework/net/gtp"
"github.com/andybalholm/brotli"
"github.com/golang/snappy"
"github.com/pierrec/lz4/v4"
"io"
)
var (
GzipCompressionLevel = gzip.DefaultCompression // gzip压缩级别
DeflateCompressionLevel = flate.DefaultCompression // deflate压缩级别
BrotliCompressionLevel = brotli.DefaultCompression // brotli压缩级别
LZ4CompressionLevel = lz4.Level4 // lz4压缩级别
)
// CompressionStream 压缩/解压缩流
type CompressionStream interface {
// WrapReader 包装解压缩流
WrapReader(r io.Reader) (io.Reader, error)
// WrapWriter 包装压缩流
WrapWriter(w io.Writer) (io.WriteCloser, error)
}
// NewCompressionStream 创建压缩/解压缩流
func NewCompressionStream(c gtp.Compression) (CompressionStream, error) {
switch c {
case gtp.Compression_Gzip:
return &_GzipStream{}, nil
case gtp.Compression_Deflate:
return &_DeflateStream{}, nil
case gtp.Compression_Brotli:
return &_BrotliStream{}, nil
case gtp.Compression_LZ4:
return &_LZ4Stream{}, nil
case gtp.Compression_Snappy:
return &_SnappyStream{}, nil
default:
return nil, ErrInvalidMethod
}
}
type _GzipStream struct {
reader *gzip.Reader
writer *gzip.Writer
}
func (s *_GzipStream) WrapReader(r io.Reader) (io.Reader, error) {
if s.reader == nil {
cr, err := gzip.NewReader(r)
if err != nil {
return nil, err
}
s.reader = cr
} else {
err := s.reader.Reset(r)
if err != nil {
return nil, err
}
}
return s.reader, nil
}
func (s *_GzipStream) WrapWriter(w io.Writer) (io.WriteCloser, error) {
if s.writer == nil {
cw, err := gzip.NewWriterLevel(w, GzipCompressionLevel)
if err != nil {
return nil, err
}
s.writer = cw
} else {
s.writer.Reset(w)
}
return s.writer, nil
}
type _DeflateStream struct {
reader io.Reader
resetter flate.Resetter
writer *flate.Writer
}
func (s *_DeflateStream) WrapReader(r io.Reader) (io.Reader, error) {
if s.reader == nil {
s.reader = flate.NewReader(r)
s.resetter = s.reader.(flate.Resetter)
} else {
s.resetter.Reset(r, nil)
}
return s.reader, nil
}
func (s *_DeflateStream) WrapWriter(w io.Writer) (io.WriteCloser, error) {
if s.writer == nil {
cw, err := flate.NewWriter(w, DeflateCompressionLevel)
if err != nil {
return nil, err
}
s.writer = cw
} else {
s.writer.Reset(w)
}
return s.writer, nil
}
type _BrotliStream struct {
reader *brotli.Reader
writer *brotli.Writer
}
func (s *_BrotliStream) WrapReader(r io.Reader) (io.Reader, error) {
if s.reader == nil {
s.reader = brotli.NewReader(r)
} else {
err := s.reader.Reset(r)
if err != nil {
return nil, err
}
}
return s.reader, nil
}
func (s *_BrotliStream) WrapWriter(w io.Writer) (io.WriteCloser, error) {
if s.writer == nil {
s.writer = brotli.NewWriterLevel(w, BrotliCompressionLevel)
} else {
s.writer.Reset(w)
}
return s.writer, nil
}
type _LZ4Stream struct {
reader *lz4.Reader
writer *lz4.Writer
}
func (s *_LZ4Stream) WrapReader(r io.Reader) (io.Reader, error) {
if s.reader == nil {
s.reader = lz4.NewReader(r)
} else {
s.reader.Reset(r)
}
return s.reader, nil
}
func (s *_LZ4Stream) WrapWriter(w io.Writer) (io.WriteCloser, error) {
if s.writer == nil {
s.writer = lz4.NewWriter(w)
s.writer.Apply(lz4.CompressionLevelOption(LZ4CompressionLevel))
} else {
s.writer.Reset(w)
}
return s.writer, nil
}
type _SnappyStream struct {
reader *snappy.Reader
writer *snappy.Writer
}
func (s *_SnappyStream) WrapReader(r io.Reader) (io.Reader, error) {
if s.reader == nil {
s.reader = snappy.NewReader(r)
} else {
s.reader.Reset(r)
}
return s.reader, nil
}
func (s *_SnappyStream) WrapWriter(w io.Writer) (io.WriteCloser, error) {
if s.writer == nil {
s.writer = snappy.NewWriter(w)
} else {
s.writer.Reset(w)
}
return s.writer, nil
}