英文:
How can I use gzip on a string?
问题
我想使用Go语言从文件中读取一块内容，将其视为字符串，并对该块内容进行gzip压缩。我知道如何从文件中读取并将其视为字符串，但是在使用compress/gzip时感到困惑。
我应该创建一个io.Writer，将其写入一个buf（字节切片），使用gzip.NewWriter(io.Writer)获取一个w *gzip.Writer，然后使用w.Write(chunk_of_file)将文件块写入buf吗？然后我需要将字符串视为字节切片。
英文:
I want to use Go to read out a chunk from a file, treat it as a string and gzip this chunk. I know how to read from the file and treat it as a string, but when it comes to compress/gzip I am lost.
Should I create an io.writer, which writes to a buf (byte slice), use gzip.NewWriter(io.writer) to get a w *gzip.Writer and then use w.Write(chunk_of_file) to write the chunk of file to buf? Then I would need to treat the string as a byte slice.
答案1
得分: 37
你可以使用gzip.Writer来编写代码，因为它实现了io.Writer接口。
示例：
package main
import (
"bytes"
"compress/gzip"
"fmt"
"log"
)
func main() {
var b bytes.Buffer
gz := gzip.NewWriter(&b)
if _, err := gz.Write([]byte("YourDataHere")); err != nil {
log.Fatal(err)
}
if err := gz.Close(); err != nil {
log.Fatal(err)
}
fmt.Println(b.Bytes())
}
如果你想设置压缩级别（默认为compress/flate中的-1），你可以使用gzip.NewWriterLevel。
英文:
You can just write using gzip.Writer as it implements io.Writer.
Example:
package main
import (
"bytes"
"compress/gzip"
"fmt"
"log"
)
func main() {
var b bytes.Buffer
gz := gzip.NewWriter(&b)
if _, err := gz.Write([]byte("YourDataHere")); err != nil {
log.Fatal(err)
}
if err := gz.Close(); err != nil {
log.Fatal(err)
}
fmt.Println(b.Bytes())
}
If you want to set the compression level (Default is -1 from compress/flate) you can use gzip.NewWriterLevel.
答案2
得分: 0
如果结果不需要返回到文件中，你可以直接使用Flate。这样可以减少使用Gzip时的一些开销。另一个选择是Brotli。以下是示例代码：
package main
import (
"bytes"
"compress/flate"
"github.com/andybalholm/brotli"
)
func compressFlate(data []byte) ([]byte, error) {
var b bytes.Buffer
w, err := flate.NewWriter(&b, 9)
if err != nil {
return nil, err
}
w.Write(data)
w.Close()
return b.Bytes(), nil
}
func compressBrotli(data []byte) []byte {
var b bytes.Buffer
w := brotli.NewWriterLevel(&b, brotli.BestCompression)
w.Write(data)
w.Close()
return b.Bytes()
}
结果代码：
package main
import (
"bytes"
"fmt"
)
func main() {
data := bytes.Repeat([]byte("hello world"), 999_999)
f, err := compressFlate(data)
if err != nil {
panic(err)
}
b := compressBrotli(data)
fmt.Println(len(f) == 21379, len(b) == 40)
}
你可以在以下链接中查看更多信息：
英文:
If the result is not going back into a file, then you could just use Flate
directly. You save a bit of overhead from Gzip. Another option is Brotli.
Examples:
package main
import (
"bytes"
"compress/flate"
"github.com/andybalholm/brotli"
)
func compressFlate(data []byte) ([]byte, error) {
var b bytes.Buffer
w, err := flate.NewWriter(&b, 9)
if err != nil {
return nil, err
}
w.Write(data)
w.Close()
return b.Bytes(), nil
}
func compressBrotli(data []byte) []byte {
var b bytes.Buffer
w := brotli.NewWriterLevel(&b, brotli.BestCompression)
w.Write(data)
w.Close()
return b.Bytes()
}
Result:
package main
import (
"bytes"
"fmt"
)
func main() {
data := bytes.Repeat([]byte("hello world"), 999_999)
f, err := compressFlate(data)
if err != nil {
panic(err)
}
b := compressBrotli(data)
fmt.Println(len(f) == 21379, len(b) == 40)
}
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