55 lines
903 B
Go
55 lines
903 B
Go
//go:build windows
|
|
|
|
package edge
|
|
|
|
import (
|
|
"io"
|
|
"syscall"
|
|
"unsafe"
|
|
|
|
"golang.org/x/sys/windows"
|
|
)
|
|
|
|
type _IStreamVtbl struct {
|
|
_IUnknownVtbl
|
|
Read ComProc
|
|
Write ComProc
|
|
}
|
|
|
|
type IStream struct {
|
|
vtbl *_IStreamVtbl
|
|
}
|
|
|
|
func (i *IStream) Release() error {
|
|
return i.vtbl.CallRelease(unsafe.Pointer(i))
|
|
}
|
|
|
|
func (i *IStream) Read(p []byte) (int, error) {
|
|
bufLen := len(p)
|
|
if bufLen == 0 {
|
|
return 0, nil
|
|
}
|
|
|
|
var n int
|
|
res, _, err := i.vtbl.Read.Call(
|
|
uintptr(unsafe.Pointer(i)),
|
|
uintptr(unsafe.Pointer(&p[0])),
|
|
uintptr(bufLen),
|
|
uintptr(unsafe.Pointer(&n)),
|
|
)
|
|
if err != windows.ERROR_SUCCESS {
|
|
return 0, err
|
|
}
|
|
|
|
switch windows.Handle(res) {
|
|
case windows.S_OK:
|
|
// The buffer has been completely filled
|
|
return n, nil
|
|
case windows.S_FALSE:
|
|
// The buffer has been filled with less than len data and the stream is EOF
|
|
return n, io.EOF
|
|
default:
|
|
return 0, syscall.Errno(res)
|
|
}
|
|
}
|