/
main.go
338 lines (247 loc) · 7.58 KB
/
main.go
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package main
import (
"bytes"
"compress/flate"
"encoding/binary"
"errors"
"fmt"
"hash/crc32"
"io"
"io/ioutil"
"math"
"regexp"
"strings"
"os"
"path"
"github.com/Luzifer/rconfig/v2"
"github.com/darktohka/ets2-dlc-repacker/scs"
log "github.com/sirupsen/logrus"
)
var (
cfg = struct {
LogLevel string `flag:"log-level" default:"info" description:"Log level (debug, info, warn, error, fatal)"`
VersionAndExit bool `flag:"version" default:"false" description:"Prints current version and exits"`
}{}
Version = "v0.1.0"
DLCPrefix = "dlc_"
ExtensionSuffix = ".scs"
ManifestSuffix = ".manifest.sii"
DLCFiles = []string{"pcg", "rocket_league", "metallics", "phys_flags", "rims", "hs_schoch", "toys", "oversize"}
ZlibBestCompression = []byte{0x78, 0xDA}
NameRegexp = regexp.MustCompile("display_name:\\s+[\"']([^\"']+)[\"']")
VersionRegexp = regexp.MustCompile("(package|compatible)_version(s)?(\\[\\])?:\\s+[\"']([^\"']+)[\"']")
)
func init() {
if err := rconfig.ParseAndValidate(&cfg); err != nil {
log.Fatalf("Unable to parse commandline options: %s", err)
}
if cfg.VersionAndExit {
fmt.Printf("ets2-dlc-repacker %s by Disyer\n", Version)
os.Exit(0)
}
if l, err := log.ParseLevel(cfg.LogLevel); err != nil {
log.WithError(err).Fatal("Unable to parse log level")
} else {
log.SetLevel(l)
}
}
func IsInputPiped() bool {
stdin, err := os.Stdin.Stat()
return err != nil || (stdin.Mode()&os.ModeCharDevice) == 0
}
func WaitForKeyboard() {
if !IsInputPiped() {
log.Info("Press any key to close this window...")
fmt.Scanln()
}
os.Exit(0)
}
func FindVersionFromManifest(manifest []byte) []byte {
matches := VersionRegexp.FindSubmatch(manifest)
if matches == nil || len(matches) < 5 {
log.Fatal("No version found in DLC file")
}
return matches[4]
}
func FindDLCNameFromManifest(manifest []byte) string {
matches := NameRegexp.FindSubmatch(manifest)
if matches == nil || len(matches) < 2 {
return "Unknown DLC"
}
return string(matches[1])
}
func FindDLCVersion(folder string, dlcName string) []byte {
f, err := os.Open(path.Join(folder, DLCPrefix+dlcName+ExtensionSuffix))
if err != nil {
log.WithError(err).Fatal("Unable to open input DLC file")
}
defer f.Close()
reader, err := scs.NewReader(f, 0)
if err != nil {
log.WithError(err).Fatal("Unable to read SCS file headers")
}
for _, file := range reader.Files {
if !strings.HasSuffix(file.Name, ManifestSuffix) {
continue
}
src, err := file.Open()
if err != nil {
log.WithError(err).Fatal("Unable to open file from archive")
}
defer src.Close()
manifest := make([]byte, file.Size)
if _, err := src.Read(manifest); err != nil && !errors.Is(err, io.EOF) {
log.WithError(err).Fatal("Unable to copy byte array into memory")
}
return FindVersionFromManifest(manifest)
}
log.Fatal("Unable to find manifest in example DLC file")
return nil
}
func FindDLCVersionFromFolder(folder string) []byte {
for _, dlcName := range DLCFiles {
var dlcFilename = DLCPrefix + dlcName + ExtensionSuffix
if _, err := os.Stat(path.Join(folder, dlcFilename)); errors.Is(err, os.ErrNotExist) {
continue
}
return FindDLCVersion(folder, dlcName)
}
log.Warn("No DLC files have been found in " + folder + ". Are you sure this is a valid game installation?")
WaitForKeyboard()
return nil
}
func FindLargestOffset(reader *scs.Reader) int64 {
var largestOffset int64 = math.MinInt64
for _, file := range reader.Files {
if file.Offset > largestOffset {
largestOffset = file.Offset
}
}
return largestOffset
}
func DeflateBytes(data []byte) ([]byte, error) {
var compressedBuffer bytes.Buffer
compressedBuffer.Write(ZlibBestCompression)
writer, err := flate.NewWriter(&compressedBuffer, flate.BestCompression)
if err != nil {
return nil, err
}
_, err = io.Copy(writer, bytes.NewReader(data))
writer.Flush()
writer.Close()
return compressedBuffer.Bytes(), err
}
func RepackDLC(filename string, targetVersion []byte) {
f, err := os.Open(filename)
if err != nil {
log.WithError(err).Fatal("Unable to open input file")
}
defer f.Close()
reader, err := scs.NewReader(f, 0)
if err != nil {
log.WithField("filename", filename).WithError(err).Fatal("Unable to read SCS file headers")
}
for _, file := range reader.Files {
if !strings.HasSuffix(file.Name, ManifestSuffix) {
continue
}
src, err := file.Open()
if err != nil {
log.WithError(err).Fatal("Unable to open file from archive")
}
defer src.Close()
manifest := make([]byte, file.Size)
if _, err := src.Read(manifest); err != nil && !errors.Is(err, io.EOF) {
log.WithError(err).Fatal("Unable to copy byte array into memory")
}
version := FindVersionFromManifest(manifest)
if bytes.Equal(version, targetVersion) {
return
}
dlcName := FindDLCNameFromManifest(manifest)
log.Info("Updating " + dlcName + " (" + path.Base(filename) + ") from version " + string(version) + " to version " + string(targetVersion) + "...")
manifest = bytes.ReplaceAll(manifest, version, targetVersion)
compressed, err := DeflateBytes(manifest)
if err != nil {
log.WithError(err).Fatal("Failed to compress")
}
if file.ZSize < int32(len(compressed)) && file.Offset != FindLargestOffset(reader) {
stat, err := os.Stat(filename)
if err != nil {
log.WithError(err).Fatal("Failed to find the length of " + filename)
}
file.CatalogEntry.Offset = stat.Size()
}
file.CatalogEntry.CRC = crc32.ChecksumIEEE(manifest)
file.CatalogEntry.Size = int32(len(manifest))
file.CatalogEntry.ZSize = int32(len(compressed))
file.CatalogEntry.Type = scs.EntryTypeCompressedFileCopy
var headerBuffer bytes.Buffer
binary.Write(&headerBuffer, binary.LittleEndian, file.CatalogEntry)
header := headerBuffer.Bytes()
if len(header) != 32 {
log.Fatal("Generated catalog header size is not 32 bytes")
}
f, err := os.OpenFile(filename, os.O_RDWR, 0644)
if err != nil {
log.WithError(err).Fatal("Unable to open file for writing: " + filename)
}
n, err := f.WriteAt(compressed, file.CatalogEntry.Offset)
if err != nil {
log.WithError(err).Fatal("Error appending new manifest")
}
if n != len(compressed) {
log.WithField("expected", len(compressed)).WithField("wrote", n).Fatal("Did not write enough bytes for new manifest")
}
n, err = f.WriteAt(header, file.CatalogOffset)
if err != nil {
log.WithError(err).Fatal("Unable to patch manifest header")
}
if n != len(header) {
log.WithField("expected", len(header)).WithField("wrote", n).Fatal("Did not write enough bytes for new manifest")
}
break
}
}
func RepackDLCsInFolder(folder string) {
if _, err := os.Stat(folder); errors.Is(err, os.ErrNotExist) {
log.Fatal("Folder does not exist")
}
log.Info("Repacking DLC files in " + folder + "...")
version := FindDLCVersionFromFolder(folder)
if version == nil {
return
}
files, err := ioutil.ReadDir(folder)
if err != nil {
log.WithError(err).Fatal("Could not enumerate files in directory")
}
for _, file := range files {
if file.IsDir() {
continue
}
name := file.Name()
if !strings.HasPrefix(name, DLCPrefix) || !strings.HasSuffix(name, ExtensionSuffix) {
continue
}
RepackDLC(path.Join(folder, name), version)
}
log.Info("Updated all DLC files to version " + string(version) + ".")
WaitForKeyboard()
}
func main() {
var folder string
switch len(rconfig.Args()) {
case 0:
case 1:
// No positional arguments
dir, err := os.Getwd()
if err != nil {
log.WithError(err).Fatal("Unable to find current working directory")
}
folder = dir
default:
folder = rconfig.Args()[1]
}
RepackDLCsInFolder(folder)
}