UefiFileHandleLib.c

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#include <Uefi.h>
 
#include <Protocol/SimpleFileSystem.h>
#include <Protocol/UnicodeCollation.h>
 
#include <Guid/FileInfo.h>
 
#include <Library/DebugLib.h>
#include <Library/MemoryAllocationLib.h>
#include <Library/BaseLib.h>
#include <Library/BaseMemoryLib.h>
#include <Library/FileHandleLib.h>
#include <Library/PcdLib.h>
#include <Library/PrintLib.h>
 
CONST UINT16  gUnicodeFileTag = EFI_UNICODE_BYTE_ORDER_MARK;
 
#define MAX_FILE_NAME_LEN            522// (20 * (6+5+2))+1) unicode characters from EFI FAT spec (doubled for bytes)
#define FIND_XXXXX_FILE_BUFFER_SIZE  (SIZE_OF_EFI_FILE_INFO + MAX_FILE_NAME_LEN)
 
EFI_FILE_INFO *
EFIAPI
FileHandleGetInfo (
  IN EFI_FILE_HANDLE  FileHandle
  )
{
  EFI_FILE_INFO  *FileInfo;
  UINTN          FileInfoSize;
  EFI_STATUS     Status;
 
  if (FileHandle == NULL) {
    return (NULL);
  }
 
  //
  // Get the required size to allocate
  //
  FileInfoSize = 0;
  FileInfo     = NULL;
  Status       = FileHandle->GetInfo (
                               FileHandle,
                               &gEfiFileInfoGuid,
                               &FileInfoSize,
                               NULL
                               );
  if (Status == EFI_BUFFER_TOO_SMALL) {
    //
    // error is expected.  getting size to allocate
    //
    FileInfo = AllocateZeroPool (FileInfoSize);
    if (FileInfo != NULL) {
      //
      // now get the information
      //
      Status = FileHandle->GetInfo (
                             FileHandle,
                             &gEfiFileInfoGuid,
                             &FileInfoSize,
                             FileInfo
                             );
      //
      // if we got an error free the memory and return NULL
      //
      if (EFI_ERROR (Status)) {
        FreePool (FileInfo);
        FileInfo = NULL;
      }
    }
  }
 
  return (FileInfo);
}
 
EFI_STATUS
EFIAPI
FileHandleSetInfo (
  IN EFI_FILE_HANDLE      FileHandle,
  IN CONST EFI_FILE_INFO  *FileInfo
  )
{
  if ((FileHandle == NULL) || (FileInfo == NULL)) {
    return (EFI_INVALID_PARAMETER);
  }
 
  //
  // Set the info
  //
  return (FileHandle->SetInfo (
                        FileHandle,
                        &gEfiFileInfoGuid,
                        (UINTN)FileInfo->Size,
                        (EFI_FILE_INFO *)FileInfo
                        ));
}
 
EFI_STATUS
EFIAPI
FileHandleRead (
  IN EFI_FILE_HANDLE  FileHandle,
  IN OUT UINTN        *BufferSize,
  OUT VOID            *Buffer
  )
{
  if (FileHandle == NULL) {
    return (EFI_INVALID_PARAMETER);
  }
 
  //
  // Perform the read based on EFI_FILE_PROTOCOL
  //
  return (FileHandle->Read (FileHandle, BufferSize, Buffer));
}
 
EFI_STATUS
EFIAPI
FileHandleWrite (
  IN EFI_FILE_HANDLE  FileHandle,
  IN OUT UINTN        *BufferSize,
  IN VOID             *Buffer
  )
{
  if (FileHandle == NULL) {
    return (EFI_INVALID_PARAMETER);
  }
 
  //
  // Perform the write based on EFI_FILE_PROTOCOL
  //
  return (FileHandle->Write (FileHandle, BufferSize, Buffer));
}
 
EFI_STATUS
EFIAPI
FileHandleClose (
  IN EFI_FILE_HANDLE  FileHandle
  )
{
  EFI_STATUS  Status;
 
  if (FileHandle == NULL) {
    return (EFI_INVALID_PARAMETER);
  }
 
  //
  // Perform the Close based on EFI_FILE_PROTOCOL
  //
  Status = FileHandle->Close (FileHandle);
  return Status;
}
 
EFI_STATUS
EFIAPI
FileHandleDelete (
  IN EFI_FILE_HANDLE  FileHandle
  )
{
  EFI_STATUS  Status;
 
  if (FileHandle == NULL) {
    return (EFI_INVALID_PARAMETER);
  }
 
  //
  // Perform the Delete based on EFI_FILE_PROTOCOL
  //
  Status = FileHandle->Delete (FileHandle);
  return Status;
}
 
EFI_STATUS
EFIAPI
FileHandleSetPosition (
  IN EFI_FILE_HANDLE  FileHandle,
  IN UINT64           Position
  )
{
  if (FileHandle == NULL) {
    return (EFI_INVALID_PARAMETER);
  }
 
  //
  // Perform the SetPosition based on EFI_FILE_PROTOCOL
  //
  return (FileHandle->SetPosition (FileHandle, Position));
}
 
EFI_STATUS
EFIAPI
FileHandleGetPosition (
  IN EFI_FILE_HANDLE  FileHandle,
  OUT UINT64          *Position
  )
{
  if ((Position == NULL) || (FileHandle == NULL)) {
    return (EFI_INVALID_PARAMETER);
  }
 
  //
  // Perform the GetPosition based on EFI_FILE_PROTOCOL
  //
  return (FileHandle->GetPosition (FileHandle, Position));
}
 
EFI_STATUS
EFIAPI
FileHandleFlush (
  IN EFI_FILE_HANDLE  FileHandle
  )
{
  if (FileHandle == NULL) {
    return (EFI_INVALID_PARAMETER);
  }
 
  //
  // Perform the Flush based on EFI_FILE_PROTOCOL
  //
  return (FileHandle->Flush (FileHandle));
}
 
EFI_STATUS
EFIAPI
FileHandleIsDirectory (
  IN EFI_FILE_HANDLE  DirHandle
  )
{
  EFI_FILE_INFO  *DirInfo;
 
  if (DirHandle == NULL) {
    return (EFI_INVALID_PARAMETER);
  }
 
  //
  // get the file information for DirHandle
  //
  DirInfo = FileHandleGetInfo (DirHandle);
 
  //
  // Parse DirInfo
  //
  if (DirInfo == NULL) {
    //
    // We got nothing...
    //
    return (EFI_INVALID_PARAMETER);
  }
 
  if ((DirInfo->Attribute & EFI_FILE_DIRECTORY) == 0) {
    //
    // Attributes say this is not a directory
    //
    FreePool (DirInfo);
    return (EFI_NOT_FOUND);
  }
 
  //
  // all good...
  //
  FreePool (DirInfo);
  return (EFI_SUCCESS);
}
 
EFI_STATUS
EFIAPI
FileHandleFindFirstFile (
  IN EFI_FILE_HANDLE  DirHandle,
  OUT EFI_FILE_INFO   **Buffer
  )
{
  EFI_STATUS  Status;
  UINTN       BufferSize;
 
  if ((Buffer == NULL) || (DirHandle == NULL)) {
    return (EFI_INVALID_PARAMETER);
  }
 
  //
  // verify that DirHandle is a directory
  //
  Status = FileHandleIsDirectory (DirHandle);
  if (EFI_ERROR (Status)) {
    return (Status);
  }
 
  //
  // Allocate a buffer sized to struct size + enough for the string at the end
  //
  BufferSize = FIND_XXXXX_FILE_BUFFER_SIZE;
  *Buffer    = AllocateZeroPool (BufferSize);
  if (*Buffer == NULL) {
    return (EFI_OUT_OF_RESOURCES);
  }
 
  //
  // reset to the beginning of the directory
  //
  Status = FileHandleSetPosition (DirHandle, 0);
  if (EFI_ERROR (Status)) {
    FreePool (*Buffer);
    *Buffer = NULL;
    return (Status);
  }
 
  //
  // read in the info about the first file
  //
  Status = FileHandleRead (DirHandle, &BufferSize, *Buffer);
  ASSERT (Status != EFI_BUFFER_TOO_SMALL);
  if (EFI_ERROR (Status) || (BufferSize == 0)) {
    FreePool (*Buffer);
    *Buffer = NULL;
    if (BufferSize == 0) {
      return (EFI_NOT_FOUND);
    }
 
    return (Status);
  }
 
  return (EFI_SUCCESS);
}
 
EFI_STATUS
EFIAPI
FileHandleFindNextFile (
  IN EFI_FILE_HANDLE  DirHandle,
  OUT EFI_FILE_INFO   *Buffer,
  OUT BOOLEAN         *NoFile
  )
{
  EFI_STATUS  Status;
  UINTN       BufferSize;
 
  if ((DirHandle == NULL) || (Buffer == NULL) || (NoFile == NULL)) {
    return (EFI_INVALID_PARAMETER);
  }
 
  //
  // This BufferSize MUST stay equal to the originally allocated one in GetFirstFile
  //
  BufferSize = FIND_XXXXX_FILE_BUFFER_SIZE;
 
  //
  // read in the info about the next file
  //
  Status = FileHandleRead (DirHandle, &BufferSize, Buffer);
  ASSERT (Status != EFI_BUFFER_TOO_SMALL);
  if (EFI_ERROR (Status)) {
    return (Status);
  }
 
  //
  // If we read 0 bytes (but did not have erros) we already read in the last file.
  //
  if (BufferSize == 0) {
    FreePool (Buffer);
    *NoFile = TRUE;
  }
 
  return (EFI_SUCCESS);
}
 
EFI_STATUS
EFIAPI
FileHandleGetSize (
  IN EFI_FILE_HANDLE  FileHandle,
  OUT UINT64          *Size
  )
{
  EFI_FILE_INFO  *FileInfo;
 
  if ((FileHandle == NULL) || (Size == NULL)) {
    return (EFI_INVALID_PARAMETER);
  }
 
  //
  // get the FileInfo structure
  //
  FileInfo = FileHandleGetInfo (FileHandle);
  if (FileInfo == NULL) {
    return (EFI_DEVICE_ERROR);
  }
 
  //
  // Assign the Size pointer to the correct value
  //
  *Size = FileInfo->FileSize;
 
  //
  // free the FileInfo memory
  //
  FreePool (FileInfo);
 
  return (EFI_SUCCESS);
}
 
EFI_STATUS
EFIAPI
FileHandleSetSize (
  IN EFI_FILE_HANDLE  FileHandle,
  IN UINT64           Size
  )
{
  EFI_FILE_INFO  *FileInfo;
  EFI_STATUS     Status;
 
  if (FileHandle == NULL) {
    return (EFI_INVALID_PARAMETER);
  }
 
  //
  // get the FileInfo structure
  //
  FileInfo = FileHandleGetInfo (FileHandle);
  if (FileInfo == NULL) {
    return (EFI_DEVICE_ERROR);
  }
 
  //
  // Assign the FileSize pointer to the new value
  //
  FileInfo->FileSize = Size;
 
  Status = FileHandleSetInfo (FileHandle, FileInfo);
  //
  // free the FileInfo memory
  //
  FreePool (FileInfo);
 
  return (Status);
}
 
CHAR16 *
EFIAPI
StrnCatGrowLeft (
  IN OUT CHAR16        **Destination,
  IN OUT UINTN         *CurrentSize,
  IN     CONST CHAR16  *Source,
  IN     UINTN         Count
  )
{
  UINTN  DestinationStartSize;
  UINTN  NewSize;
  UINTN  CopySize;
 
  if (Destination == NULL) {
    return (NULL);
  }
 
  //
  // If there's nothing to do then just return Destination
  //
  if (Source == NULL) {
    return (*Destination);
  }
 
  //
  // allow for NULL pointers address as Destination
  //
  if (*Destination != NULL) {
    ASSERT (CurrentSize != 0);
    DestinationStartSize = StrSize (*Destination);
    ASSERT (DestinationStartSize <= *CurrentSize);
  } else {
    DestinationStartSize = 0;
    //    ASSERT(*CurrentSize == 0);
  }
 
  //
  // Append all of Source?
  //
  if (Count == 0) {
    Count = StrSize (Source);
  }
 
  //
  // Test and grow if required
  //
  if (CurrentSize != NULL) {
    NewSize = *CurrentSize;
    while (NewSize < (DestinationStartSize + Count)) {
      NewSize += 2 * Count;
    }
 
    *Destination = ReallocatePool (*CurrentSize, NewSize, *Destination);
    *CurrentSize = NewSize;
  } else {
    *Destination = AllocateZeroPool (Count+sizeof (CHAR16));
  }
 
  if (*Destination == NULL) {
    return NULL;
  }
 
  CopySize = StrSize (*Destination);
  CopyMem ((*Destination)+((Count-2)/sizeof (CHAR16)), *Destination, CopySize);
  CopyMem (*Destination, Source, Count-2);
  return (*Destination);
}
 
EFI_STATUS
EFIAPI
FileHandleGetFileName (
  IN CONST EFI_FILE_HANDLE  Handle,
  OUT CHAR16                **FullFileName
  )
{
  EFI_STATUS       Status;
  UINTN            Size;
  EFI_FILE_HANDLE  CurrentHandle;
  EFI_FILE_HANDLE  NextHigherHandle;
  EFI_FILE_INFO    *FileInfo;
 
  Size = 0;
 
  //
  // Check our parameters
  //
  if ((FullFileName == NULL) || (Handle == NULL)) {
    return (EFI_INVALID_PARAMETER);
  }
 
  *FullFileName = NULL;
  CurrentHandle = NULL;
 
  Status = Handle->Open (Handle, &CurrentHandle, L".", EFI_FILE_MODE_READ, 0);
  if (!EFI_ERROR (Status)) {
    //
    // Reverse out the current directory on the device
    //
    for ( ; ;) {
      FileInfo = FileHandleGetInfo (CurrentHandle);
      if (FileInfo == NULL) {
        Status = EFI_OUT_OF_RESOURCES;
        break;
      } else {
        //
        // Prepare to move to the parent directory.
        // Also determine whether CurrentHandle refers to the Root directory.
        //
        Status = CurrentHandle->Open (CurrentHandle, &NextHigherHandle, L"..", EFI_FILE_MODE_READ, 0);
        //
        // We got info... do we have a name? if yes precede the current path with it...
        //
        if ((StrLen (FileInfo->FileName) == 0) || EFI_ERROR (Status)) {
          //
          // Both FileInfo->FileName being '\0' and EFI_ERROR() suggest that
          // CurrentHandle refers to the Root directory.  As this loop ensures
          // FullFileName is starting with '\\' at all times, signal success
          // and exit the loop.
          // While FileInfo->FileName could theoretically be a value other than
          // '\0' or '\\', '\\' is guaranteed to be supported by the
          // specification and hence its value can safely be ignored.
          //
          Status = EFI_SUCCESS;
          if (*FullFileName == NULL) {
            ASSERT ((*FullFileName == NULL && Size == 0) || (*FullFileName != NULL));
            *FullFileName = StrnCatGrowLeft (FullFileName, &Size, L"\\", 0);
          }
 
          FreePool (FileInfo);
          break;
        } else {
          if (*FullFileName == NULL) {
            ASSERT ((*FullFileName == NULL && Size == 0) || (*FullFileName != NULL));
            *FullFileName = StrnCatGrowLeft (FullFileName, &Size, L"\\", 0);
          }
 
          ASSERT ((*FullFileName == NULL && Size == 0) || (*FullFileName != NULL));
          *FullFileName = StrnCatGrowLeft (FullFileName, &Size, FileInfo->FileName, 0);
          *FullFileName = StrnCatGrowLeft (FullFileName, &Size, L"\\", 0);
          FreePool (FileInfo);
        }
      }
 
      FileHandleClose (CurrentHandle);
      //
      // Move to the parent directory
      //
      CurrentHandle = NextHigherHandle;
    }
  } else if (Status == EFI_NOT_FOUND) {
    Status = EFI_SUCCESS;
    ASSERT ((*FullFileName == NULL && Size == 0) || (*FullFileName != NULL));
    *FullFileName = StrnCatGrowLeft (FullFileName, &Size, L"\\", 0);
  }
 
  if ((*FullFileName != NULL) &&
      ((*FullFileName)[StrLen (*FullFileName) - 1] == L'\\') &&
      (StrLen (*FullFileName) > 1) &&
      (FileHandleIsDirectory (Handle) == EFI_NOT_FOUND)
      )
  {
    (*FullFileName)[StrLen (*FullFileName) - 1] = CHAR_NULL;
  }
 
  if (CurrentHandle != NULL) {
    CurrentHandle->Close (CurrentHandle);
  }
 
  if (EFI_ERROR (Status) && (*FullFileName != NULL)) {
    FreePool (*FullFileName);
  }
 
  return (Status);
}
 
CHAR16 *
EFIAPI
FileHandleReturnLine (
  IN EFI_FILE_HANDLE  Handle,
  IN OUT BOOLEAN      *Ascii
  )
{
  CHAR16      *RetVal;
  UINTN       Size;
  EFI_STATUS  Status;
 
  Size   = 0;
  RetVal = NULL;
 
  Status = FileHandleReadLine (Handle, RetVal, &Size, FALSE, Ascii);
  if (Status == EFI_BUFFER_TOO_SMALL) {
    RetVal = AllocateZeroPool (Size);
 
    if (RetVal == NULL) {
      return NULL;
    }
 
    Status = FileHandleReadLine (Handle, RetVal, &Size, FALSE, Ascii);
  }
 
  ASSERT_EFI_ERROR (Status);
  if (EFI_ERROR (Status) && (RetVal != NULL)) {
    FreePool (RetVal);
    RetVal = NULL;
  }
 
  return (RetVal);
}
 
EFI_STATUS
EFIAPI
FileHandleReadLine (
  IN EFI_FILE_HANDLE  Handle,
  IN OUT CHAR16       *Buffer,
  IN OUT UINTN        *Size,
  IN BOOLEAN          Truncate,
  IN OUT BOOLEAN      *Ascii
  )
{
  EFI_STATUS  Status;
  CHAR16      CharBuffer;
  UINT64      FileSize;
  UINTN       CharSize;
  UINTN       CountSoFar;
  UINTN       CrCount;
  UINTN       OldSize;
  UINT64      OriginalFilePosition;
 
  if (  (Handle == NULL)
     || (Size   == NULL)
     || ((Buffer == NULL) && (*Size != 0))
        )
  {
    return (EFI_INVALID_PARAMETER);
  }
 
  if ((Buffer != NULL) && (*Size != 0)) {
    *Buffer = CHAR_NULL;
  }
 
  Status = FileHandleGetSize (Handle, &FileSize);
  if (EFI_ERROR (Status)) {
    return Status;
  } else if (FileSize == 0) {
    *Ascii = TRUE;
    return EFI_SUCCESS;
  }
 
  FileHandleGetPosition (Handle, &OriginalFilePosition);
  if (OriginalFilePosition == 0) {
    CharSize = sizeof (CHAR16);
    Status   = FileHandleRead (Handle, &CharSize, &CharBuffer);
    ASSERT_EFI_ERROR (Status);
    if (CharBuffer == gUnicodeFileTag) {
      *Ascii = FALSE;
    } else {
      *Ascii = TRUE;
      FileHandleSetPosition (Handle, OriginalFilePosition);
    }
  }
 
  CrCount = 0;
  for (CountSoFar = 0; ; CountSoFar++) {
    CharBuffer = 0;
    if (*Ascii) {
      CharSize = sizeof (CHAR8);
    } else {
      CharSize = sizeof (CHAR16);
    }
 
    Status = FileHandleRead (Handle, &CharSize, &CharBuffer);
    if (  EFI_ERROR (Status)
       || (CharSize == 0)
       || ((CharBuffer == L'\n') && !(*Ascii))
       || ((CharBuffer ==  '\n') && *Ascii)
          )
    {
      break;
    } else if (
               ((CharBuffer == L'\r') && !(*Ascii)) ||
               ((CharBuffer ==  '\r') && *Ascii)
               )
    {
      CrCount++;
      continue;
    }
 
    //
    // if we have space save it...
    //
    if ((CountSoFar+1-CrCount)*sizeof (CHAR16) < *Size) {
      ASSERT (Buffer != NULL);
      ((CHAR16 *)Buffer)[CountSoFar-CrCount]   = CharBuffer;
      ((CHAR16 *)Buffer)[CountSoFar+1-CrCount] = CHAR_NULL;
    }
  }
 
  //
  // if we ran out of space tell when...
  //
  if ((CountSoFar+1-CrCount)*sizeof (CHAR16) > *Size) {
    OldSize = *Size;
    *Size   = (CountSoFar+1-CrCount)*sizeof (CHAR16);
    if (!Truncate) {
      if ((Buffer != NULL) && (OldSize != 0)) {
        ZeroMem (Buffer, OldSize);
      }
 
      FileHandleSetPosition (Handle, OriginalFilePosition);
      return (EFI_BUFFER_TOO_SMALL);
    } else {
      DEBUG ((DEBUG_WARN, "The line was truncated in FileHandleReadLine"));
      return (EFI_SUCCESS);
    }
  }
 
  return (Status);
}
 
EFI_STATUS
EFIAPI
FileHandleWriteLine (
  IN EFI_FILE_HANDLE  Handle,
  IN CHAR16           *Buffer
  )
{
  EFI_STATUS  Status;
  CHAR16      CharBuffer;
  UINTN       Size;
  UINTN       Index;
  UINTN       CharSize;
  UINT64      FileSize;
  UINT64      OriginalFilePosition;
  BOOLEAN     Ascii;
  CHAR8       *AsciiBuffer;
 
  if (Buffer == NULL) {
    return (EFI_SUCCESS);
  }
 
  if (Handle == NULL) {
    return (EFI_INVALID_PARAMETER);
  }
 
  Ascii       = FALSE;
  AsciiBuffer = NULL;
 
  Status = FileHandleGetPosition (Handle, &OriginalFilePosition);
  if (EFI_ERROR (Status)) {
    return Status;
  }
 
  Status = FileHandleSetPosition (Handle, 0);
  if (EFI_ERROR (Status)) {
    return Status;
  }
 
  Status = FileHandleGetSize (Handle, &FileSize);
  if (EFI_ERROR (Status)) {
    return Status;
  }
 
  if (FileSize == 0) {
    Ascii = TRUE;
  } else {
    CharSize = sizeof (CHAR16);
    Status   = FileHandleRead (Handle, &CharSize, &CharBuffer);
    ASSERT_EFI_ERROR (Status);
    if (CharBuffer == gUnicodeFileTag) {
      Ascii = FALSE;
    } else {
      Ascii = TRUE;
    }
  }
 
  Status = FileHandleSetPosition (Handle, OriginalFilePosition);
  if (EFI_ERROR (Status)) {
    return Status;
  }
 
  if (Ascii) {
    Size        = (StrSize (Buffer) / sizeof (CHAR16)) * sizeof (CHAR8);
    AsciiBuffer = (CHAR8 *)AllocateZeroPool (Size);
    if (AsciiBuffer == NULL) {
      return EFI_OUT_OF_RESOURCES;
    }
 
    UnicodeStrToAsciiStrS (Buffer, AsciiBuffer, Size);
    for (Index = 0; Index < Size; Index++) {
      if ((AsciiBuffer[Index] & BIT7) != 0) {
        FreePool (AsciiBuffer);
        return EFI_INVALID_PARAMETER;
      }
    }
 
    Size   = AsciiStrSize (AsciiBuffer) - sizeof (CHAR8);
    Status = FileHandleWrite (Handle, &Size, AsciiBuffer);
    if (EFI_ERROR (Status)) {
      FreePool (AsciiBuffer);
      return (Status);
    }
 
    Size   = AsciiStrSize ("\r\n") - sizeof (CHAR8);
    Status = FileHandleWrite (Handle, &Size, "\r\n");
  } else {
    if (OriginalFilePosition == 0) {
      Status = FileHandleSetPosition (Handle, sizeof (CHAR16));
      if (EFI_ERROR (Status)) {
        return Status;
      }
    }
 
    Size   = StrSize (Buffer) - sizeof (CHAR16);
    Status = FileHandleWrite (Handle, &Size, Buffer);
    if (EFI_ERROR (Status)) {
      return (Status);
    }
 
    Size   = StrSize (L"\r\n") - sizeof (CHAR16);
    Status = FileHandleWrite (Handle, &Size, L"\r\n");
  }
 
  if (AsciiBuffer != NULL) {
    FreePool (AsciiBuffer);
  }
 
  return Status;
}
 
EFI_STATUS
EFIAPI
FileHandlePrintLine (
  IN EFI_FILE_HANDLE  Handle,
  IN CONST CHAR16     *Format,
  ...
  )
{
  VA_LIST     Marker;
  CHAR16      *Buffer;
  EFI_STATUS  Status;
 
  //
  // Get a buffer to print into
  //
  Buffer = AllocateZeroPool (PcdGet16 (PcdUefiFileHandleLibPrintBufferSize));
  if (Buffer == NULL) {
    return (EFI_OUT_OF_RESOURCES);
  }
 
  //
  // Print into our buffer
  //
  VA_START (Marker, Format);
  UnicodeVSPrint (Buffer, PcdGet16 (PcdUefiFileHandleLibPrintBufferSize), Format, Marker);
  VA_END (Marker);
 
  //
  // Print buffer into file
  //
  Status = FileHandleWriteLine (Handle, Buffer);
 
  //
  // Cleanup and return
  //
  FreePool (Buffer);
  return (Status);
}
 
BOOLEAN
EFIAPI
FileHandleEof (
  IN EFI_FILE_HANDLE  Handle
  )
{
  EFI_FILE_INFO  *Info;
  UINT64         Pos;
  BOOLEAN        RetVal;
 
  if (Handle == NULL) {
    return (FALSE);
  }
 
  FileHandleGetPosition (Handle, &Pos);
  Info = FileHandleGetInfo (Handle);
 
  if (Info == NULL) {
    return (FALSE);
  }
 
  FileHandleSetPosition (Handle, Pos);
 
  if (Pos == Info->FileSize) {
    RetVal = TRUE;
  } else {
    RetVal = FALSE;
  }
 
  FreePool (Info);
 
  return (RetVal);
}