出错：Golang意外的EOF

Question

这是我的代码，我是Go新手。我试着在谷歌上搜索这个问题，但我不能完全理解它，我认为这与read()方法有关。

package main

import (
    ...
)

type compressor struct {
    content []byte
}

func (r *compressor) compress() []byte {
    ...
}

func (r *compressor) decompress() []byte {
    var buffer bytes.Buffer
    dc := flate.NewReader(&buffer)
    _, err := dc.Read(r.content)
    if err != nil {
        if err != io.EOF {
            log.Fatal(err)
        }
    }

    return buffer.Bytes()
}

func main() {
    fileName := os.Args[1]
    fmt.Println(os.Args)
    contents, err := ioutil.ReadFile(fileName)
    if err != nil {
        log.Fatal(err)
    }

    fmt.Print("Uncompressed data: ")
    fmt.Println(len(contents))

    comp := compressor{contents}
    buffer := comp.decompress()
    fmt.Print("Uncompressed data: ")
    fmt.Println(len(comp.decompress()))

    err = ioutil.WriteFile(fileName+".decjc", buffer, 0644)
    if err != nil {
        log.Fatal(err)
    }
}

输出如下：

dylan@skynet:~/Documents/EXP/jc$ ./jc data.txt.jc

[./jc data.txt.jc]

Uncompressed data: 2364480

2018/06/29 21:41:35 unexpected EOF

Answer 1

You got the in and outputs mixed up.

flate.NewReader takes the compressed input as a io.Reader and it returns a io.ReadCloser that can be used to get the uncompressed output:

func (r *compressor) decompress() []byte {
    dc := flate.NewReader(bytes.NewReader(r.content))
    defer dc.Close()
    rb, err := ioutil.ReadAll(dc)
    if err != nil {
        if err != io.EOF {
            log.Fatalf("Err %v
 read %v", err, rb)
        }
    }
    return rb
}