# package ascii85
`import "encoding/ascii85"`
ascii85包實現了ascii85數據編碼(5個ascii字符表示4個字節),該編碼用于btoa工具和Adobe的PostScript語言和PDF文檔格式。
## Index
* [type CorruptInputError](#CorruptInputError)
* [func (e CorruptInputError) Error() string](#CorruptInputError.Error)
* [func MaxEncodedLen(n int) int](#MaxEncodedLen)
* [func Encode(dst, src []byte) int](#Encode)
* [func Decode(dst, src []byte, flush bool) (ndst, nsrc int, err error)](#Decode)
* [func NewEncoder(w io.Writer) io.WriteCloser](#NewEncoder)
* [func NewDecoder(r io.Reader) io.Reader](#NewDecoder)
## type [CorruptInputError](https://github.com/golang/go/blob/master/src/encoding/ascii85/ascii85.go#L169 "View Source")
```
type CorruptInputError int64
```
### func (CorruptInputError) [Error](https://github.com/golang/go/blob/master/src/encoding/ascii85/ascii85.go#L171 "View Source")
```
func (e CorruptInputError) Error() string
```
## func [MaxEncodedLen](https://github.com/golang/go/blob/master/src/encoding/ascii85/ascii85.go#L86 "View Source")
```
func MaxEncodedLen(n int) int
```
返回n字節源數據編碼后的最大字節數。
## func [Encode](https://github.com/golang/go/blob/master/src/encoding/ascii85/ascii85.go#L27 "View Source")
```
func Encode(dst, src []byte) int
```
將src編碼成最多MaxEncodedLen(len(src))數據寫入dst,返回實際寫入的字節數。編碼每4字節一段進行一次,最后一個片段采用特殊的處理方式,因此不應將本函數用于處理大數據流的某一獨立數據塊。
一般來說ascii85編碼數據會被'<~'和'~>'包括起來,函數并未添加上它們。
## func [Decode](https://github.com/golang/go/blob/master/src/encoding/ascii85/ascii85.go#L189 "View Source")
```
func Decode(dst, src []byte, flush bool) (ndst, nsrc int, err error)
```
將src解碼后寫入dst,返回寫入dst的字節數、從src解碼的字節數。如果src含有非法數據,函數將返回成功執行的數據(兩個數字)和CorruptInputError。如果flush為真,則函數會認為src代表輸入流的結尾,完全處理src,而不會等待另一個32字節的數據塊。
函數會忽略src中的空格和控制字符,一般來說ascii85編碼數據會被'<~'和'~>'包括起來,但是調用者應自行去掉它們。
## func [NewEncoder](https://github.com/golang/go/blob/master/src/encoding/ascii85/ascii85.go#L93 "View Source")
```
func NewEncoder(w io.Writer) io.WriteCloser
```
創建一個將數據編碼為ascii85流寫入w的編碼器。Ascii85編碼算法操作32位塊,寫入結束后,必須調用Close方法將緩存中保留的不完整塊刷新到w里。
## func [NewDecoder](https://github.com/golang/go/blob/master/src/encoding/ascii85/ascii85.go#L246 "View Source")
```
func NewDecoder(r io.Reader) io.Reader
```
創建一個從r解碼ascii85流的解碼器。
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