On 08/28/14 08:39, Gabor Puha wrote:
> All,
>
> I am developing an efi loader and having problem to write an allocated
> mem or text to a file on efi partition. I can create and del but I am
> not able to write a file. I have checked all doc but example with
> declaration was not found. Please, help with an example(or correct my
> one)...regards
> Gab..
>
> here my code:
Please post plaintext, not HTML; the code is near unreadable. But:
>
>
> static CHAR16 *PATH = L"\\TEST\\test.txt
>
> EFI_STATUS SavePass(EFI_DEVICE_PATH **LoaderDevicePath2)
> {
> EFI_FILE_IO_INTERFACE *Device_unit;
>
> EFI_FILE_HANDLE efi_hand_root,pass_file;
>
> EFI_HANDLE* efi_hand_array;
>
> UINTN handler,i;
>
> EFI_STATUS ferr,err;
>
>
> UINTN Size,wsize;
> VOID *OsKernelBuffer = NULL;
> *LoaderDevicePath2 = (EFI_DEVICE_PATH *)NULL;
>
> Size=0x00000012;
>
> BS->AllocatePool(EfiLoaderData, Size, &OsKernelBuffer);
>
>
> wsize=sizeof(OsKernelBuffer);
Not sure if this causes your problem, but "wsize" here is set to the
size of a *pointer*, not to the size of the pointed-to buffer. Then,
>
>
> err =
> efi_hand_root->Open(efi_hand_root,&pass_file,PATH,EFI_FILE_MODE_WRITE |
> EFI_FILE_MODE_CREATE | EFI_FILE_MODE_READ,0); //THIS IS OK. ITS CREATE
> IS SUCCESS
>
> if(err == EFI_SUCCESS)
>
> {
>
>
>
> Print(L"[*] File Opened..\r\n");
>
>
> ferr=efi_hand_root->Write(efi_hand_root,wsize,OsKernelBuffer);
> //IT returns with 8000000000002 means EFI_INVALID_PARAMETER
You try to write out the number of bytes inside the pointer, from the
buffer pointed-to by the pointer. That's not ideal.
Worse, you're trying to write through "efi_hand_root", which is a handle
to the root directory of the volume. (Well, I assume that anyway,
because your code doesn't show how "efi_hand_root" is populated at all.
But you said that the file was at least created, so I must assume
"efi_hand_root" was valid.)
Anyway, as I said, assuming "efi_hand_root" is valid: you just opened
the new file under handle "pass_file". But here you don't use
"pass_file" to write to the file, you're trying to write to it through
the root directory's handle.
Laszlo
>
>
> Print(L"\nPress [ENTER] to continue...\n");
> Input(NULL,Keypass,10);
>
> Print(L"Write ERROR: %lX \r\n",ferr);
> if(ferr == EFI_SUCCESS)
> {
> efi_hand_root->Flush(pass_file);
> efi_hand_root->Close(pass_file);
>
>
> Print(L"[*] Write Success...\r\n");
> }
>
> efi_hand_root->Close(pass_file);
>
> *LoaderDevicePath2 = FileDevicePath(efi_hand_array[i],PATH);
>
>
> break;
>
> }
>
>
>
> break;
>
> }
>
>
> }
>
>
>
> FreePool(OsKernelBuffer);
>
> return err;
> }
>
>
>
>
> ------------------------------------------------------------------------------
> Slashdot TV.
> Video for Nerds. Stuff that matters.
> http://tv.slashdot.org/
>
>
>
> _______________________________________________
> edk2-devel mailing list
> edk2-devel@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/edk2-devel
>
------------------------------------------------------------------------------
Slashdot TV.
Video for Nerds. Stuff that matters.
http://tv.slashdot.org/
_______________________________________________
edk2-devel mailing list
edk2-devel@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/edk2-devel
