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main.go
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main.go
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package main
import (
"flag"
"fmt"
"github.com/lico-n/unneko"
"os"
"path/filepath"
"strings"
"sync"
)
func main() {
outputDir := flag.String("o", "./output", "output directory")
flag.Parse()
args := flag.Args()
if len(args) == 0 {
fmt.Fprintln(os.Stderr, "unneko v1.17.0 by Lico#6969")
fmt.Fprintln(os.Stderr, "Usage: unneko <flags> input-file")
flag.PrintDefaults()
os.Exit(-1)
}
inputFiles, err := getInputFiles(args[0])
if err != nil {
fmt.Printf("unable to read input files: %v", err)
os.Exit(-1)
}
for _, v := range inputFiles {
fmt.Printf("extracting: %s\n", v)
if err := performExtraction(v, *outputDir); err != nil {
fmt.Printf("failed to extract nekodata: %v", err)
os.Exit(-1)
}
}
}
func performExtraction(inputFilePath string, outputDir string) error {
r, err := unneko.NewReaderFromFile(inputFilePath)
if err != nil {
return err
}
extractedChan := make(chan *unneko.ExtractedFile, 1)
// run extraction thread
go func() {
defer close(extractedChan)
for r.HasNext() {
file, err := r.Next()
if err != nil {
fmt.Fprintln(os.Stderr, err)
break
}
extractedChan <- file
}
}()
// run file storing threads
numOfSaveWorker := 16
wg := &sync.WaitGroup{}
wg.Add(numOfSaveWorker)
for i := 0; i < numOfSaveWorker; i++ {
go startFileSavingWorker(wg, inputFilePath, outputDir, extractedChan)
}
wg.Wait()
return nil
}
func startFileSavingWorker(wg *sync.WaitGroup, inputFile string, outputPath string, ch <-chan *unneko.ExtractedFile) {
defer wg.Done()
for file := range ch {
outputFilePath := filepath.Join(outputPath, getFileNameWithoutExt(inputFile), file.Path())
outputDir := filepath.Dir(outputFilePath)
if err := os.MkdirAll(outputDir, os.ModePerm); err != nil {
fmt.Fprintln(os.Stderr, fmt.Errorf("creating output dir %s: %v", outputDir, err))
continue
}
if err := os.WriteFile(outputFilePath, file.Data(), os.ModePerm); err != nil {
fmt.Fprintln(os.Stderr, fmt.Errorf("saving extracted file %s: %v", outputFilePath, err))
continue
}
}
}
func getFileNameWithoutExt(inputFile string) string {
baseFile := filepath.Base(inputFile)
splitted := strings.Split(baseFile, ".")
return splitted[0]
}
func getInputFiles(path string) ([]string, error) {
info, err := os.Stat(path)
if err != nil {
return nil, fmt.Errorf("stat input path: %v", err)
}
if !info.IsDir() {
return []string{path}, nil
}
var nekoFiles []string
dirFiles, err := os.ReadDir(path)
if err != nil {
return nil, fmt.Errorf("stat input dir: %v", err)
}
for _, v := range dirFiles {
if v.IsDir() {
continue
}
if strings.HasSuffix(v.Name(), ".nekodata") {
nekoPath := filepath.Join(path, v.Name())
nekoFiles = append(nekoFiles, nekoPath)
}
}
return nekoFiles, nil
}