lazarus/formats/mpq/mpq.go

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package mpq
// #cgo LDFLAGS: -L./stormlib/ -lstorm -lz -lbz2 -lstdc++
// #include <stdlib.h>
// #define WINAPI
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// #define DWORD unsigned int
// #define HANDLE void *
// #define LPDWORD unsigned int *
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// #define LPOVERLAPPED void *
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// #define TCHAR char
// #define bool unsigned char
// bool WINAPI SFileOpenArchive(const TCHAR * szMpqName, DWORD dwPriority, DWORD dwFlags, HANDLE * phMpq);
// bool WINAPI SFileCloseArchive(HANDLE hMpq);
// bool WINAPI SFileOpenFileEx(HANDLE hMpq, const char * szFileName, DWORD dwSearchScope, HANDLE * phFile);
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// DWORD WINAPI SFileGetFileSize(HANDLE hFile, LPDWORD pdwFileSizeHigh);
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// bool WINAPI SFileReadFile(HANDLE hFile, void * lpBuffer, DWORD dwToRead, LPDWORD pdwRead, LPOVERLAPPED lpOverlapped);
// bool WINAPI SFileCloseFile(HANDLE hFile);
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// DWORD GetLastError();
import "C"
import (
"bytes"
"fmt"
"io"
"math"
"os"
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"strings"
"unsafe"
)
type File interface {
Read(data []byte) (int, error)
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GetSize() int
Close() error
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}
type Archive interface {
OpenFile(path string) (File, error)
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GetPaths() []string
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Close() error
}
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func NewFromFile(path string) (Archive, error) {
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cs := C.CString(path)
defer C.free(unsafe.Pointer(cs))
a := new(archive)
if result := C.SFileOpenArchive(cs, 0, 0, &a.handle); result == 0 {
return nil, fmt.Errorf("failed to open archive (%d)", getLastError())
}
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if err := a.buildPathMap(); err != nil {
a.Close()
return nil, err
}
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return a, nil
}
type file struct {
handle unsafe.Pointer
offset int
size int
}
func (f *file) Read(data []byte) (int, error) {
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bytesRemaining := f.size - f.offset
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if bytesRemaining == 0 {
return 0, io.EOF
}
bytesRequested := len(data)
if bytesRequested > bytesRemaining {
bytesRequested = bytesRemaining
}
var bytesRead int
if result := C.SFileReadFile(f.handle, unsafe.Pointer(&data[0]), C.unsigned(bytesRequested), (*C.unsigned)(unsafe.Pointer(&bytesRead)), nil); result == 0 {
return 0, fmt.Errorf("failed to read file (%d)", getLastError())
}
f.offset += bytesRead
return bytesRead, nil
}
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func (f *file) GetSize() int {
return f.size
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}
func (f *file) Close() error {
if result := C.SFileCloseFile(f.handle); result == 0 {
return fmt.Errorf("failed to close file (%d)", getLastError())
}
f.handle = nil
f.offset = 0
f.size = 0
return nil
}
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func (f *file) buildSize() error {
size := int(C.SFileGetFileSize(f.handle, nil))
if size == -1 {
return fmt.Errorf("failed to get file size (%d)", getLastError())
}
f.size = size
return nil
}
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type archive struct {
handle unsafe.Pointer
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paths map[string]string
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}
func (a *archive) Close() error {
if result := C.SFileCloseArchive(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) {
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if pathInt, ok := a.paths[path]; ok {
path = pathInt
}
cs := C.CString(path)
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defer C.free(unsafe.Pointer(cs))
file := &file{size: math.MaxUint32}
if result := C.SFileOpenFileEx(a.handle, cs, 0, &file.handle); result == 0 {
return nil, fmt.Errorf("failed to open file (%d)", getLastError())
}
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if err := file.buildSize(); err != nil {
file.Close()
return nil, err
}
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return file, nil
}
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func (a *archive) GetPaths() []string {
var extPaths []string
for extPath := range a.paths {
extPaths = append(extPaths, extPath)
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}
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return extPaths
}
func (a *archive) buildPathMap() error {
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f, err := a.OpenFile("(listfile)")
if err != nil {
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return err
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}
defer f.Close()
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var buff bytes.Buffer
if _, err := io.Copy(&buff, f); err != nil {
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return err
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}
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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 := santizePath(pathInt)
a.paths[pathExt] = pathInt
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}
}
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return nil
}
func santizePath(path string) string {
return strings.ToLower(strings.Replace(path, "\\", string(os.PathSeparator), -1))
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}
func getLastError() uint {
return uint(C.GetLastError())
}