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                # package zlib `import "compress/zlib"` zlib包實現了對zlib格式壓縮數據的讀寫,參見[RFC 1950](http://tools.ietf.org/html/rfc1950)。 本包的實現提供了在讀取時解壓和寫入時壓縮的濾鏡。例如,將壓縮數據寫入一個bytes.Buffer: ``` var b bytes.Buffer w := zlib.NewWriter(&b) w.Write([]byte("hello, world\n")) w.Close() ``` 然后將數據讀取回來: ``` r, err := zlib.NewReader(&b) io.Copy(os.Stdout, r) r.Close() ``` ## Index * [Constants](#pkg-constants) * [Variables](#pkg-variables) * [func NewReader(r io.Reader) (io.ReadCloser, error)](#NewReader) * [func NewReaderDict(r io.Reader, dict []byte) (io.ReadCloser, error)](#NewReaderDict) * [type Writer](#Writer) * [func NewWriter(w io.Writer) \*Writer](#NewWriter) * [func NewWriterLevel(w io.Writer, level int) (\*Writer, error)](#NewWriterLevel) * [func NewWriterLevelDict(w io.Writer, level int, dict []byte) (\*Writer, error)](#NewWriterLevelDict) * [func (z \*Writer) Close() error](#Writer.Close) * [func (z \*Writer) Flush() error](#Writer.Flush) * [func (z \*Writer) Reset(w io.Writer)](#Writer.Reset) * [func (z \*Writer) Write(p []byte) (n int, err error)](#Writer.Write) ### Examples * [NewReader](#example-NewReader) * [NewWriter](#example-NewWriter) ## Constants ``` const ( NoCompression = flate.NoCompression BestSpeed = flate.BestSpeed BestCompression = flate.BestCompression DefaultCompression = flate.DefaultCompression ) ``` 這些常量都是拷貝自flate包,因此導入"compress/zlib"后,就不必再導入"compress/flate"了。 ## Variables ``` var ( // 當讀取的zlib數據的校驗和錯誤時,會返回ErrChecksum ErrChecksum = errors.New("zlib: invalid checksum") // 當讀取的zlib數據的目錄錯誤時,會返回ErrDictionary ErrDictionary = errors.New("zlib: invalid dictionary") // 當讀取的zlib數據的頭域錯誤時,會返回ErrHeader ErrHeader = errors.New("zlib: invalid header") ) ``` ## func [NewReader](https://github.com/golang/go/blob/master/src/compress/zlib/reader.go#L58 "View Source") ``` func NewReader(r io.Reader) (io.ReadCloser, error) ``` NewReader返回一個從r讀取并解壓數據的io.ReadCloser。其實現會緩沖輸入流的數據,并可能從r中讀取比需要的更多的數據。調用者有責任在讀取完畢后調用返回值的Close方法。 Example ``` buff := []byte{120, 156, 202, 72, 205, 201, 201, 215, 81, 40, 207, 47, 202, 73, 225, 2, 4, 0, 0, 255, 255, 33, 231, 4, 147} b := bytes.NewReader(buff) r, err := zlib.NewReader(b) if err != nil { panic(err) } io.Copy(os.Stdout, r) ``` Output: ``` hello, world ``` ## func [NewReaderDict](https://github.com/golang/go/blob/master/src/compress/zlib/reader.go#L64 "View Source") ``` func NewReaderDict(r io.Reader, dict []byte) (io.ReadCloser, error) ``` NewReaderDict類似NewReader,但會使用預設的字典初始化返回的Reader。 如果壓縮數據沒有采用字典,本函數會忽略該參數。 ## type [Writer](https://github.com/golang/go/blob/master/src/compress/zlib/writer.go#L26 "View Source") ``` type Writer struct { // 內含隱藏或非導出字段 } ``` Writer將提供給它的數據壓縮后寫入下層io.Writer接口。 ### func [NewWriter](https://github.com/golang/go/blob/master/src/compress/zlib/writer.go#L42 "View Source") ``` func NewWriter(w io.Writer) *Writer ``` NewWriter創建并返回一個Writer。寫入返回值的數據都會在壓縮后寫入w。 調用者有責任在結束寫入后調用返回值的Close方法。因為寫入的數據可能保存在緩沖中沒有刷新入下層。 Example ``` var b bytes.Buffer w := zlib.NewWriter(&b) w.Write([]byte("hello, world\n")) w.Close() fmt.Println(b.Bytes()) ``` Output: ``` [120 156 202 72 205 201 201 215 81 40 207 47 202 73 225 2 4 0 0 255 255 33 231 4 147] ``` ### func [NewWriterLevel](https://github.com/golang/go/blob/master/src/compress/zlib/writer.go#L53 "View Source") ``` func NewWriterLevel(w io.Writer, level int) (*Writer, error) ``` NewWriterLevel類似NewWriter但指定了壓縮水平而不是采用默認的DefaultCompression。 參數level可以是DefaultCompression、NoCompression或BestSpeed與BestCompression之間包括二者的任何整數。如果level合法,返回的錯誤值為nil。 ### func [NewWriterLevelDict](https://github.com/golang/go/blob/master/src/compress/zlib/writer.go#L62 "View Source") ``` func NewWriterLevelDict(w io.Writer, level int, dict []byte) (*Writer, error) ``` NewWriterLevelDict類似NewWriterLevel但還指定了用于壓縮的字典。dict參數可以為nil;否則,在返回的Writer關閉之前,其內容不可被修改。 ### func (\*Writer) [Reset](https://github.com/golang/go/blob/master/src/compress/zlib/writer.go#L76 "View Source") ``` func (z *Writer) Reset(w io.Writer) ``` Reset將w重置,丟棄當前的寫入狀態,并將下層輸出目標設為dst。效果上等價于將w設為使用dst和w的壓縮水平、字典重新調用NewWriterLevel或NewWriterLevelDict返回的\*Writer。 ### func (\*Writer) [Write](https://github.com/golang/go/blob/master/src/compress/zlib/writer.go#L146 "View Source") ``` func (z *Writer) Write(p []byte) (n int, err error) ``` Write將p壓縮后寫入下層io.Writer接口。壓縮后的數據不一定會立刻刷新,除非Writer被關閉或者顯式的刷新。 ### func (\*Writer) [Flush](https://github.com/golang/go/blob/master/src/compress/zlib/writer.go#L166 "View Source") ``` func (z *Writer) Flush() error ``` Flush將緩沖中的壓縮數據刷新到下層io.Writer接口中。 ### func (\*Writer) [Close](https://github.com/golang/go/blob/master/src/compress/zlib/writer.go#L179 "View Source") ``` func (z *Writer) Close() error ``` 調用Close會刷新緩沖并關閉w,但不會關閉下層io.Writer接口。
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