lazarus/formats/mpq/mpq.go
2019-01-08 18:45:19 -08:00

159 lines
3.4 KiB
Go

package mpq
// #cgo windows CFLAGS: -D_MPQ_WINDOWS
// #cgo windows LDFLAGS: -Lstormlib -lstorm -lwininet -lz -lbz2 -lstdc++
// #cgo linux CFLAGS: -D_MPQ_LINUX
// #cgo linux LDFLAGS: -L./stormlib/ -lstorm -lz -lbz2 -lstdc++
// #ifdef _MPQ_WINDOWS
// #include "native_windows.h"
// #endif
// #ifdef _MPQ_LINUX
// #include "native_linux.h"
// #endif
import "C"
import (
"bytes"
"fmt"
"io"
"os"
"strings"
"unsafe"
)
type Archive struct {
handle unsafe.Pointer
paths map[string]string
}
func NewFromFile(path string) (*Archive, error) {
cs := C.CString(path)
defer C.free(unsafe.Pointer(cs))
a := new(Archive)
if result := C.SFileOpenArchive(cs, 0, 0, (*C.HANDLE)(&a.handle)); result == 0 {
return nil, fmt.Errorf("failed to open archive (%d)", getLastError())
}
if err := a.buildPathMap(); err != nil {
a.Close()
return nil, err
}
return a, nil
}
func (a *Archive) Close() error {
if result := C.SFileCloseArchive(C.HANDLE(a.handle)); result == 0 {
return fmt.Errorf("failed to close archive (%d)", getLastError())
}
a.handle = nil
a.paths = nil
return nil
}
func (a *Archive) OpenFile(path string) (*File, error) {
if pathInt, ok := a.paths[path]; ok {
path = pathInt
}
cs := C.CString(path)
defer C.free(unsafe.Pointer(cs))
file := new(File)
if result := C.SFileOpenFileEx(C.HANDLE(a.handle), cs, 0, (*C.HANDLE)(&file.handle)); result == 0 {
return nil, fmt.Errorf("failed to open file (%d)", getLastError())
}
return file, nil
}
func (a *Archive) GetPaths() []string {
var extPaths []string
for extPath := range a.paths {
extPaths = append(extPaths, extPath)
}
return extPaths
}
func (a *Archive) buildPathMap() error {
f, err := a.OpenFile("(listfile)")
if err != nil {
return err
}
defer f.Close()
var buff bytes.Buffer
if _, err := io.Copy(&buff, f); err != nil {
return err
}
a.paths = make(map[string]string)
lines := strings.Split(string(buff.Bytes()), "\r\n")
for _, line := range lines {
pathInt := strings.TrimSpace(line)
if len(pathInt) > 0 {
pathExt := sanitizePath(pathInt)
a.paths[pathExt] = pathInt
}
}
return nil
}
type File struct {
handle unsafe.Pointer
}
func (f *File) Read(data []byte) (int, error) {
var bytesRead int
if result := C.SFileReadFile(C.HANDLE(f.handle), unsafe.Pointer(&data[0]), C.ulong(len(data)), (*C.ulong)(unsafe.Pointer(&bytesRead)), nil); result == 0 {
lastError := getLastError()
if lastError == C.ERROR_HANDLE_EOF {
return bytesRead, io.EOF
}
return 0, fmt.Errorf("failed to read file (%d)", lastError)
}
return bytesRead, nil
}
func (f *File) Seek(offset int64, whence int) (int64, error) {
var method uint
switch whence {
case io.SeekStart:
method = C.FILE_BEGIN
case io.SeekCurrent:
method = C.FILE_CURRENT
case io.SeekEnd:
method = C.FILE_END
}
result := C.SFileSetFilePointer(C.HANDLE(f.handle), C.long(offset), nil, C.ulong(method))
if result == C.SFILE_INVALID_SIZE {
return 0, fmt.Errorf("failed to set file pointer (%d)", getLastError())
}
return int64(result), nil
}
func (f *File) Close() error {
if result := C.SFileCloseFile(C.HANDLE(f.handle)); result == 0 {
return fmt.Errorf("failed to close file (%d)", getLastError())
}
f.handle = nil
return nil
}
func sanitizePath(path string) string {
return strings.ToLower(strings.Replace(path, "\\", string(os.PathSeparator), -1))
}
func getLastError() uint {
return uint(C.GetLastError())
}