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decompress.go
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decompress.go
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package random
import (
"bufio"
"encoding/gob"
"fmt"
"io/ioutil"
"log"
"net/http"
"os"
"strings"
"github.com/klauspost/compress/zstd"
)
var defaultDir = ".random_base_data"
var sourceUrlPrefix = "https://raw.githubusercontent.com/474420502/random_data/master/"
func CheckAndDecompress(githuburl string, obj interface{}) {
if info, err := os.Stat(defaultDir); err != nil {
if os.IsNotExist(err) {
err = os.MkdirAll(defaultDir, os.ModePerm)
if err != nil {
panic(err)
}
}
} else {
if !info.IsDir() {
panic(fmt.Errorf("%s file exists and is not dir", defaultDir))
}
}
idx := strings.LastIndex(githuburl, "/")
filename := defaultDir + "/" + githuburl[idx+1:]
f, err := os.Open(filename)
if err != nil {
resp, err := http.DefaultClient.Get(githuburl)
if err != nil {
panic(err)
}
data, err := ioutil.ReadAll(resp.Body)
if err != nil {
panic(err)
}
log.Println(len(data))
f, err = os.OpenFile(filename, os.O_CREATE|os.O_WRONLY, 0664)
if err != nil {
panic(err)
}
if len(data) <= 100 {
panic("找不到该数据")
}
w := bufio.NewWriter(f)
_, err = w.Write(data)
if err != nil {
panic(err)
}
err = w.Flush()
if err != nil {
panic(err)
}
if err := f.Close(); err != nil {
panic(err)
}
f, err = os.Open(filename)
if err != nil {
panic(err)
}
}
dec, err := zstd.NewReader(f)
if err != nil {
panic(err)
}
err = gob.NewDecoder(dec).Decode(obj)
if err != nil {
panic(err)
}
}
func CompressData(filepath string, data interface{}) {
f, err := os.OpenFile(filepath, os.O_CREATE|os.O_RDWR|os.O_TRUNC, 0664)
if err != nil {
panic(err)
}
enc, err := zstd.NewWriter(f)
if err != nil {
panic(err)
}
genc := gob.NewEncoder(enc)
if err != nil {
panic(err)
}
err = genc.Encode(data)
if err != nil {
panic(err)
}
enc.Close()
f.Close()
}