feat: add internal/zecall

internal/zecall/zecall_windows.go

@@ -0,0 +1,59 @@
+package gozel
+
+import (
+	"errors"
+	"syscall"
+)
+
+const (
+	zeLibraryName = "ze_loader.dll"
+)
+
+var (
+	// ErrZeCallNotInit please call Init() first
+	ErrZeCallNotInit = errors.New("zecall not init")
+	// ErrNoSuchProcess please register the process first
+	ErrNoSuchProcess = errors.New("no such process")
+)
+
+var (
+	libZeLoader *syscall.DLL
+	procMap     = map[string]*syscall.Proc{}
+)
+
+// Init load lib using syscall
+func Init() error {
+	h, err := syscall.LoadLibrary(zeLibraryName)
+	if err != nil {
+		return err
+	}
+	libZeLoader = &syscall.DLL{Handle: h, Name: zeLibraryName}
+
+	return nil
+}
+
+// Register a process for calling
+func Register(name string) error {
+	if libZeLoader == nil {
+		return ErrZeCallNotInit
+	}
+	proc, err := libZeLoader.FindProc(name)
+	if err != nil {
+		return err
+	}
+	procMap[name] = proc
+	return nil
+}
+
+// Call a process
+func Call(name string, args ...uintptr) (r1, r2 uintptr, err error) {
+	fn, ok := procMap[name]
+	if !ok {
+		return 0, 0, ErrNoSuchProcess
+	}
+	r1, r2, err = fn.Call(args...)
+	if r1 == 0 {
+		err = nil
+	}
+	return
+}