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/
rezfile.go
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/
rezfile.go
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package gorez
import (
"encoding/binary"
"fmt"
"io/ioutil"
"os"
"path/filepath"
"unsafe"
)
type REZFile struct {
// File reader
reader *os.File
// File name
name string
// File size
size int64
// File header
header REZMainHeader
// File File info entries
infoFiles []*REZEntryFileInfo
// File Dir info entries
infoDirs []*REZEntryDirInfo
}
func NewREZFile(filename string) *REZFile {
return &REZFile{
name: filename,
}
}
func (rf *REZFile) Filename() string {
return rf.name
}
func (rf *REZFile) Size() int64 {
return rf.size
}
func (rf *REZFile) Header() *REZMainHeader {
return &rf.header
}
func (rf *REZFile) Files() []*REZEntryFileInfo {
return rf.infoFiles
}
func (rf *REZFile) Dirs() []*REZEntryDirInfo {
return rf.infoDirs
}
func (rf *REZFile) Open() error {
var file, err = os.Open(rf.name)
if err != nil {
return err
}
rf.reader = file
rf.size, _ = rf.reader.Seek(0, 2)
_, _ = rf.reader.Seek(0, 0)
if err := binary.Read(rf.reader, binary.LittleEndian, &rf.header); err != nil {
rf.reader.Close()
return err
}
return nil
}
func (rf *REZFile) Close() error {
if rf.reader != nil {
return rf.reader.Close()
}
return fmt.Errorf("No file has been opened yet")
}
func (rf *REZFile) Read() (err error) {
var offset = int64(rf.header.RootDirPos)
var maxOffset = int64(rf.header.RootDirPos + rf.header.RootDirSize)
if _, err = rf.reader.Seek(offset, 0); err != nil {
return
}
if err = rf.readEntry(offset, maxOffset, ""); err != nil {
return
}
return nil
}
func (rf *REZFile) Extract(outputDir string) (count int, errors []error) {
for i := 0; i < len(rf.infoFiles); i++ {
var fileInfo = rf.infoFiles[i]
if fileInfo == nil {
continue
}
if err := rf.ExtractFile(fileInfo, filepath.Join(outputDir, fileInfo.FileFullName)); err != nil {
errors = append(errors, err)
continue
}
count++
}
return
}
func (rf *REZFile) ExtractFile(fileInfo *REZEntryFileInfo, destFile string) error {
var fileOutputDir = filepath.Dir(destFile)
if _, err := os.Stat(fileOutputDir); os.IsNotExist(err) {
if err := os.MkdirAll(fileOutputDir, os.ModePerm); err != nil {
return err
}
}
var buf = make([]byte, fileInfo.Size)
if _, err := rf.reader.ReadAt(buf, int64(fileInfo.Pos)); err != nil {
return err
}
if err := ioutil.WriteFile(destFile, buf, os.ModePerm); err != nil {
return err
}
return nil
}
// --------------------------------------------
func (rf *REZFile) readEntry(offset int64, maxOffset int64, dir string) (err error) {
if offset >= rf.size {
return fmt.Errorf("readEntry: Offset out of range: %d/%d", offset, rf.size)
}
var readOffset = offset
var entryType int32
if _, err = rf.reader.Seek(readOffset, 0); err != nil {
return
}
for readOffset < maxOffset {
entryType, err = rf.readEntryType(readOffset)
if err != nil {
return fmt.Errorf("readEntryType: %v", err)
}
readOffset += int64(unsafe.Sizeof(entryType))
switch entryType {
case 0: // File
var fileInfo, err = rf.readEntryFile(readOffset, dir)
if err != nil {
return fmt.Errorf("readEntryFile: %v", err)
}
// Ignores empty file such as DIRTYPETEXTURES
if fileInfo.Size > 0 {
rf.infoFiles = append(rf.infoFiles, fileInfo)
}
if fileInfo.DataSize > REZEntryDirHeaderSize {
readOffset += (fileInfo.DataSize - REZEntryDirHeaderSize)
}
case 1: // Directory
var dirInfo, err = rf.readEntryDir(readOffset, dir)
if err != nil {
return fmt.Errorf("readEntryDir: %v", err)
}
if dirInfo.Size > 0 {
rf.infoDirs = append(rf.infoDirs, dirInfo)
if err := rf.readEntry(int64(dirInfo.Pos), int64(dirInfo.Pos+dirInfo.Size), (dir + dirInfo.DirName + "\\")); err != nil {
return err
}
}
if dirInfo.DataSize > REZEntryDirHeaderSize {
readOffset += (dirInfo.DataSize - REZEntryDirHeaderSize)
}
}
readOffset += REZEntryDirHeaderSize
}
return nil
}
func (rf *REZFile) readEntryType(offset int64) (ret int32, err error) {
if offset >= 0 {
if _, err = rf.reader.Seek(offset, 0); err != nil {
return -1, err
}
}
if err = binary.Read(rf.reader, binary.LittleEndian, &ret); err != nil {
return -1, err
}
return
}
func (rf *REZFile) readEntryFile(offset int64, dir string) (*REZEntryFileInfo, error) {
if offset >= 0 {
if _, err := rf.reader.Seek(offset, 0); err != nil {
return nil, err
}
}
var info = REZEntryFileInfo{}
if err := binary.Read(rf.reader, binary.LittleEndian, &info.REZEntryRezHeader); err != nil {
return nil, err
}
info.FileName = rf.trimNTString(rf.readNTString(-1))
info.FileExt = rf.reverseString(rf.trimNTString(string(info.Type[:])))
info.FileFullName = (dir + info.FileName)
if len(info.FileExt) > 0 {
info.FileFullName += ("." + info.FileExt)
}
// (Pos + Size + Time + ID + NumKeys) + Type + FileName
info.DataSize = (20 + (int64(unsafe.Sizeof(info.Type)) + 1) + (int64(len(info.FileName) + 1)))
return &info, nil
}
func (rf *REZFile) readEntryDir(offset int64, dir string) (*REZEntryDirInfo, error) {
if offset >= 0 {
if _, err := rf.reader.Seek(offset, 0); err != nil {
return nil, err
}
}
var info = REZEntryDirInfo{}
if err := binary.Read(rf.reader, binary.LittleEndian, &info.REZEntryDirHeader); err != nil {
return nil, err
}
info.DirName = rf.trimNTString(rf.readNTString(-1))
info.DirFullName = (dir + info.DirName + "\\")
// (Pos + Size + Time) + DirName
info.DataSize = (12 + (int64(len(info.DirName) + 1)))
return &info, nil
}
func (rf *REZFile) readNTString(offset int64) (ret string) {
if offset >= 0 {
if _, err := rf.reader.Seek(offset, 0); err != nil {
return
}
}
var buf = []byte{1}
for buf[0] != 0 {
var _, err = rf.reader.Read(buf)
if err != nil {
return
}
ret += string(buf)
}
return
}
func (rf *REZFile) trimNTString(s string) (ret string) {
for i := 0; i < len(s); i++ {
if s[i] != 0 {
ret += string(s[i])
}
}
return
}
func (rf *REZFile) reverseString(s string) string {
var strLen = len(s)
if strLen <= 1 {
return s
}
var buf = make([]rune, strLen)
for _, c := range s {
strLen--
buf[strLen] = c
}
return string(buf[:])
}