英文:
Zip a slice of byte into another slice in Golang
问题
我想要实现与这里给出的解决方案完全相反的功能，将一个字节切片压缩到另一个字节切片中 -
类似于 -
func ZipBytes(unippedBytes []byte) ([]byte, error) {
// ...
}
[我将以多部分表单数据的形式上传该压缩文件以进行POST请求]
英文:
I want to achieve exactly opposite of the solution given here, zipping a slice of byte into another slice of byte -
Something like -
func ZipBytes(unippedBytes []byte) ([]byte, error) {
// ...
}
[I am going to upload that zipped file as multipart form data for a POST request]
答案1
得分: 3
你可以直接使用bytes.Buffer将数据压缩到内存中。
以下示例使用compress/zlib，因为它与问题中给出的示例相反。根据你的用例，你也可以很容易地将其更改为compress/gzip（API非常相似）。
package data_test
import (
"bytes"
"compress/zlib"
"io"
"testing"
)
func compress(buf []byte) ([]byte, error) {
var out bytes.Buffer
w := zlib.NewWriter(&out)
if _, err := w.Write(buf); err != nil {
return nil, err
}
if err := w.Close(); err != nil {
return nil, err
}
return out.Bytes(), nil
}
func decompress(buf []byte) (_ []byte, e error) {
r, err := zlib.NewReader(bytes.NewReader(buf))
if err != nil {
return nil, err
}
defer func() {
if err := r.Close(); e == nil {
e = err
}
}()
return io.ReadAll(r)
}
func TestRoundtrip(t *testing.T) {
want := []byte("test data")
zdata, err := compress(want)
if err != nil {
t.Fatalf("compress: %v", err)
}
got, err := decompress(zdata)
if err != nil {
t.Fatalf("decompress: %v", err)
}
if !bytes.Equal(want, got) {
t.Errorf("roundtrip: got = %q; want = %q", got, want)
}
}
希望对你有帮助！
英文:
You can compress directly into memory using a bytes.Buffer.
The following example uses compress/zlib since it is the opposite of the example given in the question. Depending on your use case you could easily change it to compress/gzip as well (very similar APIs).
package data_test
import (
"bytes"
"compress/zlib"
"io"
"testing"
)
func compress(buf []byte) ([]byte, error) {
var out bytes.Buffer
w := zlib.NewWriter(&out)
if _, err := w.Write(buf); err != nil {
return nil, err
}
if err := w.Close(); err != nil {
return nil, err
}
return out.Bytes(), nil
}
func decompress(buf []byte) (_ []byte, e error) {
r, err := zlib.NewReader(bytes.NewReader(buf))
if err != nil {
return nil, err
}
defer func() {
if err := r.Close(); e == nil {
e = err
}
}()
return io.ReadAll(r)
}
func TestRoundtrip(t *testing.T) {
want := []byte("test data")
zdata, err := compress(want)
if err != nil {
t.Fatalf("compress: %v", err)
}
got, err := decompress(zdata)
if err != nil {
t.Fatalf("decompress: %v", err)
}
if !bytes.Equal(want, got) {
t.Errorf("roundtrip: got = %q; want = %q", got, want)
}
}
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