Position.c

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#include "NTFS.h"
#include "Driver.h"
 
EFI_STATUS
EFIAPI
FileGetPosition (
  IN  EFI_FILE_PROTOCOL  *This,
  OUT UINT64             *Position
  )
{
  EFI_NTFS_FILE  *File;
 
  ASSERT (This != NULL);
  ASSERT (Position != NULL);
 
  File = (EFI_NTFS_FILE *)This;
 
  *Position = File->IsDir ? File->DirIndex : File->Offset;
 
  return EFI_SUCCESS;
}
 
EFI_STATUS
EFIAPI
FileSetPosition (
  IN EFI_FILE_PROTOCOL  *This,
  IN UINT64             Position
  )
{
  EFI_NTFS_FILE  *File;
  UINT64         FileSize;
 
  ASSERT (This != NULL);
 
  File = (EFI_NTFS_FILE *)This;
 
  if (File->IsDir) {
    if (Position != 0) {
      return EFI_INVALID_PARAMETER;
    }
 
    File->DirIndex = 0;
    return EFI_SUCCESS;
  }
 
  FileSize = File->RootFile.DataAttributeSize;
 
  if (Position == 0xFFFFFFFFFFFFFFFFULL) {
    Position = FileSize;
  } else if (Position > FileSize) {
    DEBUG ((DEBUG_INFO, "NTFS: '%s': Cannot seek to #%Lx of %Lx\n", File->Path, Position, FileSize));
    return EFI_UNSUPPORTED;
  }
 
  File->Offset = Position;
 
  return EFI_SUCCESS;
}