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Add 4 APIs to DevicePathLib: ConvertDeviceNodeToText, ConvertDevicePathToText, ConvertTextToDeviceNode and ConvertTextToDevicePath.

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Add a new instance of DevicePathLib which tries to locate the protocol and if it's not found, it uses the internal functions.

Signed-off-by: Ruiyu Ni <ruiyu.ni@intel.com>
Reviewed-by: Liming Gao <liming.gao@intel.com>

git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@14504 6f19259b-4bc3-4df7-8a09-765794883524
This commit is contained in:
Ruiyu Ni
2013-07-26 03:00:21 +00:00
committed by niruiyu
parent 1fd4578528
commit 4d0a30a494
15 changed files with 2490 additions and 1849 deletions
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689
MdePkg/Library/UefiDevicePathLib/UefiDevicePathLib.c
View File

@@ -8,7 +8,7 @@
environment varibles. Multi-instance device paths should never be placed
on a Handle.
Copyright (c) 2006 - 2012, Intel Corporation. All rights reserved.<BR>
Copyright (c) 2006 - 2013, Intel Corporation. All rights reserved.<BR>
This program and the accompanying materials
are licensed and made available under the terms and conditions of the BSD License
which accompanies this distribution. The full text of the license may be found at
@@ -20,319 +20,7 @@
**/
#include <Uefi.h>
#include <Library/DevicePathLib.h>
#include <Library/BaseMemoryLib.h>
#include <Library/DebugLib.h>
#include <Library/MemoryAllocationLib.h>
#include <Library/UefiBootServicesTableLib.h>
#include <Library/BaseLib.h>
#include <Library/PcdLib.h>
//
// Template for an end-of-device path node.
//
GLOBAL_REMOVE_IF_UNREFERENCED CONST EFI_DEVICE_PATH_PROTOCOL mUefiDevicePathLibEndDevicePath = {
END_DEVICE_PATH_TYPE,
END_ENTIRE_DEVICE_PATH_SUBTYPE,
{
END_DEVICE_PATH_LENGTH,
0
}
};
/**
Determine whether a given device path is valid.
If DevicePath is NULL, then ASSERT().
@param DevicePath A pointer to a device path data structure.
@param MaxSize The maximum size of the device path data structure.
@retval TRUE DevicePath is valid.
@retval FALSE The length of any node node in the DevicePath is less
than sizeof (EFI_DEVICE_PATH_PROTOCOL).
@retval FALSE If MaxSize is not zero, the size of the DevicePath
exceeds MaxSize.
@retval FALSE If PcdMaximumDevicePathNodeCount is not zero, the node
count of the DevicePath exceeds PcdMaximumDevicePathNodeCount.
**/
BOOLEAN
EFIAPI
IsDevicePathValid (
IN CONST EFI_DEVICE_PATH_PROTOCOL *DevicePath,
IN UINTN MaxSize
)
{
UINTN Count;
UINTN Size;
UINTN NodeLength;
ASSERT (DevicePath != NULL);
for (Count = 0, Size = 0; !IsDevicePathEnd (DevicePath); DevicePath = NextDevicePathNode (DevicePath)) {
NodeLength = DevicePathNodeLength (DevicePath);
if (NodeLength < sizeof (EFI_DEVICE_PATH_PROTOCOL)) {
return FALSE;
}
if (MaxSize > 0) {
Size += NodeLength;
if (Size + END_DEVICE_PATH_LENGTH > MaxSize) {
return FALSE;
}
}
if (PcdGet32 (PcdMaximumDevicePathNodeCount) > 0) {
Count++;
if (Count >= PcdGet32 (PcdMaximumDevicePathNodeCount)) {
return FALSE;
}
}
}
//
// Only return TRUE when the End Device Path node is valid.
//
return (BOOLEAN) (DevicePathNodeLength (DevicePath) == END_DEVICE_PATH_LENGTH);
}
/**
Returns the Type field of a device path node.
Returns the Type field of the device path node specified by Node.
If Node is NULL, then ASSERT().
@param Node A pointer to a device path node data structure.
@return The Type field of the device path node specified by Node.
**/
UINT8
EFIAPI
DevicePathType (
IN CONST VOID *Node
)
{
ASSERT (Node != NULL);
return ((EFI_DEVICE_PATH_PROTOCOL *)(Node))->Type;
}
/**
Returns the SubType field of a device path node.
Returns the SubType field of the device path node specified by Node.
If Node is NULL, then ASSERT().
@param Node A pointer to a device path node data structure.
@return The SubType field of the device path node specified by Node.
**/
UINT8
EFIAPI
DevicePathSubType (
IN CONST VOID *Node
)
{
ASSERT (Node != NULL);
return ((EFI_DEVICE_PATH_PROTOCOL *)(Node))->SubType;
}
/**
Returns the 16-bit Length field of a device path node.
Returns the 16-bit Length field of the device path node specified by Node.
Node is not required to be aligned on a 16-bit boundary, so it is recommended
that a function such as ReadUnaligned16() be used to extract the contents of
the Length field.
If Node is NULL, then ASSERT().
@param Node A pointer to a device path node data structure.
@return The 16-bit Length field of the device path node specified by Node.
**/
UINTN
EFIAPI
DevicePathNodeLength (
IN CONST VOID *Node
)
{
UINTN Length;
ASSERT (Node != NULL);
Length = ReadUnaligned16 ((UINT16 *)&((EFI_DEVICE_PATH_PROTOCOL *)(Node))->Length[0]);
ASSERT (Length >= sizeof (EFI_DEVICE_PATH_PROTOCOL));
return Length;
}
/**
Returns a pointer to the next node in a device path.
Returns a pointer to the device path node that follows the device path node
specified by Node.
If Node is NULL, then ASSERT().
@param Node A pointer to a device path node data structure.
@return a pointer to the device path node that follows the device path node
specified by Node.
**/
EFI_DEVICE_PATH_PROTOCOL *
EFIAPI
NextDevicePathNode (
IN CONST VOID *Node
)
{
ASSERT (Node != NULL);
return (EFI_DEVICE_PATH_PROTOCOL *)((UINT8 *)(Node) + DevicePathNodeLength(Node));
}
/**
Determines if a device path node is an end node of a device path.
This includes nodes that are the end of a device path instance and nodes that
are the end of an entire device path.
Determines if the device path node specified by Node is an end node of a device path.
This includes nodes that are the end of a device path instance and nodes that are the
end of an entire device path. If Node represents an end node of a device path,
then TRUE is returned. Otherwise, FALSE is returned.
If Node is NULL, then ASSERT().
@param Node A pointer to a device path node data structure.
@retval TRUE The device path node specified by Node is an end node of a
device path.
@retval FALSE The device path node specified by Node is not an end node of
a device path.
**/
BOOLEAN
EFIAPI
IsDevicePathEndType (
IN CONST VOID *Node
)
{
ASSERT (Node != NULL);
return (BOOLEAN) (DevicePathType (Node) == END_DEVICE_PATH_TYPE);
}
/**
Determines if a device path node is an end node of an entire device path.
Determines if a device path node specified by Node is an end node of an entire
device path. If Node represents the end of an entire device path, then TRUE is
returned. Otherwise, FALSE is returned.
If Node is NULL, then ASSERT().
@param Node A pointer to a device path node data structure.
@retval TRUE The device path node specified by Node is the end of an entire
device path.
@retval FALSE The device path node specified by Node is not the end of an
entire device path.
**/
BOOLEAN
EFIAPI
IsDevicePathEnd (
IN CONST VOID *Node
)
{
ASSERT (Node != NULL);
return (BOOLEAN) (IsDevicePathEndType (Node) && DevicePathSubType(Node) == END_ENTIRE_DEVICE_PATH_SUBTYPE);
}
/**
Determines if a device path node is an end node of a device path instance.
Determines if a device path node specified by Node is an end node of a device
path instance. If Node represents the end of a device path instance, then TRUE
is returned. Otherwise, FALSE is returned.
If Node is NULL, then ASSERT().
@param Node A pointer to a device path node data structure.
@retval TRUE The device path node specified by Node is the end of a device
path instance.
@retval FALSE The device path node specified by Node is not the end of a
device path instance.
**/
BOOLEAN
EFIAPI
IsDevicePathEndInstance (
IN CONST VOID *Node
)
{
ASSERT (Node != NULL);
return (BOOLEAN) (IsDevicePathEndType (Node) && DevicePathSubType(Node) == END_INSTANCE_DEVICE_PATH_SUBTYPE);
}
/**
Sets the length, in bytes, of a device path node.
Sets the length of the device path node specified by Node to the value specified
by NodeLength. NodeLength is returned. Node is not required to be aligned on
a 16-bit boundary, so it is recommended that a function such as WriteUnaligned16()
be used to set the contents of the Length field.
If Node is NULL, then ASSERT().
If NodeLength >= SIZE_64KB, then ASSERT().
If NodeLength < sizeof (EFI_DEVICE_PATH_PROTOCOL), then ASSERT().
@param Node A pointer to a device path node data structure.
@param Length The length, in bytes, of the device path node.
@return Length
**/
UINT16
EFIAPI
SetDevicePathNodeLength (
IN OUT VOID *Node,
IN UINTN Length
)
{
ASSERT (Node != NULL);
ASSERT ((Length >= sizeof (EFI_DEVICE_PATH_PROTOCOL)) && (Length < SIZE_64KB));
return WriteUnaligned16 ((UINT16 *)&((EFI_DEVICE_PATH_PROTOCOL *)(Node))->Length[0], (UINT16)(Length));
}
/**
Fills in all the fields of a device path node that is the end of an entire device path.
Fills in all the fields of a device path node specified by Node so Node represents
the end of an entire device path. The Type field of Node is set to
END_DEVICE_PATH_TYPE, the SubType field of Node is set to
END_ENTIRE_DEVICE_PATH_SUBTYPE, and the Length field of Node is set to
END_DEVICE_PATH_LENGTH. Node is not required to be aligned on a 16-bit boundary,
so it is recommended that a function such as WriteUnaligned16() be used to set
the contents of the Length field.
If Node is NULL, then ASSERT().
@param Node A pointer to a device path node data structure.
**/
VOID
EFIAPI
SetDevicePathEndNode (
OUT VOID *Node
)
{
ASSERT (Node != NULL);
CopyMem (Node, &mUefiDevicePathLibEndDevicePath, sizeof (mUefiDevicePathLibEndDevicePath));
}
#include "UefiDevicePathLib.h"
/**
Returns the size of a device path in bytes.
@@ -353,28 +41,7 @@ GetDevicePathSize (
IN CONST EFI_DEVICE_PATH_PROTOCOL *DevicePath
)
{
CONST EFI_DEVICE_PATH_PROTOCOL *Start;
if (DevicePath == NULL) {
return 0;
}
if (!IsDevicePathValid (DevicePath, 0)) {
return 0;
}
//
// Search for the end of the device path structure
//
Start = DevicePath;
while (!IsDevicePathEnd (DevicePath)) {
DevicePath = NextDevicePathNode (DevicePath);
}
//
// Compute the size and add back in the size of the end device path structure
//
return ((UINTN) DevicePath - (UINTN) Start) + DevicePathNodeLength (DevicePath);
return UefiDevicePathLibGetDevicePathSize (DevicePath);
}
/**
@@ -399,21 +66,7 @@ DuplicateDevicePath (
IN CONST EFI_DEVICE_PATH_PROTOCOL *DevicePath
)
{
UINTN Size;
//
// Compute the size
//
Size = GetDevicePathSize (DevicePath);
if (Size == 0) {
return NULL;
}
//
// Allocate space for duplicate device path
//
return AllocateCopyPool (Size, DevicePath);
return UefiDevicePathLibDuplicateDevicePath (DevicePath);
}
/**
@@ -447,48 +100,7 @@ AppendDevicePath (
IN CONST EFI_DEVICE_PATH_PROTOCOL *SecondDevicePath OPTIONAL
)
{
UINTN Size;
UINTN Size1;
UINTN Size2;
EFI_DEVICE_PATH_PROTOCOL *NewDevicePath;
EFI_DEVICE_PATH_PROTOCOL *DevicePath2;
//
// If there's only 1 path, just duplicate it.
//
if (FirstDevicePath == NULL) {
return DuplicateDevicePath ((SecondDevicePath != NULL) ? SecondDevicePath : &mUefiDevicePathLibEndDevicePath);
}
if (SecondDevicePath == NULL) {
return DuplicateDevicePath (FirstDevicePath);
}
if (!IsDevicePathValid (FirstDevicePath, 0) || !IsDevicePathValid (SecondDevicePath, 0)) {
return NULL;
}
//
// Allocate space for the combined device path. It only has one end node of
// length EFI_DEVICE_PATH_PROTOCOL.
//
Size1 = GetDevicePathSize (FirstDevicePath);
Size2 = GetDevicePathSize (SecondDevicePath);
Size = Size1 + Size2 - END_DEVICE_PATH_LENGTH;
NewDevicePath = AllocatePool (Size);
if (NewDevicePath != NULL) {
NewDevicePath = CopyMem (NewDevicePath, FirstDevicePath, Size1);
//
// Over write FirstDevicePath EndNode and do the copy
//
DevicePath2 = (EFI_DEVICE_PATH_PROTOCOL *) ((CHAR8 *) NewDevicePath +
(Size1 - END_DEVICE_PATH_LENGTH));
CopyMem (DevicePath2, SecondDevicePath, Size2);
}
return NewDevicePath;
return UefiDevicePathLibAppendDevicePath (FirstDevicePath, SecondDevicePath);
}
/**
@@ -526,37 +138,7 @@ AppendDevicePathNode (
IN CONST EFI_DEVICE_PATH_PROTOCOL *DevicePathNode OPTIONAL
)
{
EFI_DEVICE_PATH_PROTOCOL *TempDevicePath;
EFI_DEVICE_PATH_PROTOCOL *NextNode;
EFI_DEVICE_PATH_PROTOCOL *NewDevicePath;
UINTN NodeLength;
if (DevicePathNode == NULL) {
return DuplicateDevicePath ((DevicePath != NULL) ? DevicePath : &mUefiDevicePathLibEndDevicePath);
}
//
// Build a Node that has a terminator on it
//
NodeLength = DevicePathNodeLength (DevicePathNode);
TempDevicePath = AllocatePool (NodeLength + END_DEVICE_PATH_LENGTH);
if (TempDevicePath == NULL) {
return NULL;
}
TempDevicePath = CopyMem (TempDevicePath, DevicePathNode, NodeLength);
//
// Add and end device path node to convert Node to device path
//
NextNode = NextDevicePathNode (TempDevicePath);
SetDevicePathEndNode (NextNode);
//
// Append device paths
//
NewDevicePath = AppendDevicePath (DevicePath, TempDevicePath);
FreePool (TempDevicePath);
return NewDevicePath;
return UefiDevicePathLibAppendDevicePathNode (DevicePath, DevicePathNode);
}
/**
@@ -589,41 +171,7 @@ AppendDevicePathInstance (
IN CONST EFI_DEVICE_PATH_PROTOCOL *DevicePathInstance OPTIONAL
)
{
EFI_DEVICE_PATH_PROTOCOL *NewDevicePath;
EFI_DEVICE_PATH_PROTOCOL *TempDevicePath;
UINTN SrcSize;
UINTN InstanceSize;
if (DevicePath == NULL) {
return DuplicateDevicePath (DevicePathInstance);
}
if (DevicePathInstance == NULL) {
return NULL;
}
if (!IsDevicePathValid (DevicePath, 0) || !IsDevicePathValid (DevicePathInstance, 0)) {
return NULL;
}
SrcSize = GetDevicePathSize (DevicePath);
InstanceSize = GetDevicePathSize (DevicePathInstance);
NewDevicePath = AllocatePool (SrcSize + InstanceSize);
if (NewDevicePath != NULL) {
TempDevicePath = CopyMem (NewDevicePath, DevicePath, SrcSize);;
while (!IsDevicePathEnd (TempDevicePath)) {
TempDevicePath = NextDevicePathNode (TempDevicePath);
}
TempDevicePath->SubType = END_INSTANCE_DEVICE_PATH_SUBTYPE;
TempDevicePath = NextDevicePathNode (TempDevicePath);
CopyMem (TempDevicePath, DevicePathInstance, InstanceSize);
}
return NewDevicePath;
return UefiDevicePathLibAppendDevicePathInstance (DevicePath, DevicePathInstance);
}
/**
@@ -661,53 +209,7 @@ GetNextDevicePathInstance (
OUT UINTN *Size
)
{
EFI_DEVICE_PATH_PROTOCOL *DevPath;
EFI_DEVICE_PATH_PROTOCOL *ReturnValue;
UINT8 Temp;
ASSERT (Size != NULL);
if (DevicePath == NULL || *DevicePath == NULL) {
*Size = 0;
return NULL;
}
if (!IsDevicePathValid (*DevicePath, 0)) {
return NULL;
}
//
// Find the end of the device path instance
//
DevPath = *DevicePath;
while (!IsDevicePathEndType (DevPath)) {
DevPath = NextDevicePathNode (DevPath);
}
//
// Compute the size of the device path instance
//
*Size = ((UINTN) DevPath - (UINTN) (*DevicePath)) + sizeof (EFI_DEVICE_PATH_PROTOCOL);
//
// Make a copy and return the device path instance
//
Temp = DevPath->SubType;
DevPath->SubType = END_ENTIRE_DEVICE_PATH_SUBTYPE;
ReturnValue = DuplicateDevicePath (*DevicePath);
DevPath->SubType = Temp;
//
// If DevPath is the end of an entire device path, then another instance
// does not follow, so *DevicePath is set to NULL.
//
if (DevicePathSubType (DevPath) == END_ENTIRE_DEVICE_PATH_SUBTYPE) {
*DevicePath = NULL;
} else {
*DevicePath = NextDevicePathNode (DevPath);
}
return ReturnValue;
return UefiDevicePathLibGetNextDevicePathInstance (DevicePath, Size);
}
/**
@@ -737,23 +239,7 @@ CreateDeviceNode (
IN UINT16 NodeLength
)
{
EFI_DEVICE_PATH_PROTOCOL *DevicePath;
if (NodeLength < sizeof (EFI_DEVICE_PATH_PROTOCOL)) {
//
// NodeLength is less than the size of the header.
//
return NULL;
}
DevicePath = AllocateZeroPool (NodeLength);
if (DevicePath != NULL) {
DevicePath->Type = NodeType;
DevicePath->SubType = NodeSubType;
SetDevicePathNodeLength (DevicePath, NodeLength);
}
return DevicePath;
return UefiDevicePathLibCreateDeviceNode (NodeType, NodeSubType, NodeLength);
}
/**
@@ -777,115 +263,98 @@ IsDevicePathMultiInstance (
IN CONST EFI_DEVICE_PATH_PROTOCOL *DevicePath
)
{
CONST EFI_DEVICE_PATH_PROTOCOL *Node;
if (DevicePath == NULL) {
return FALSE;
}
if (!IsDevicePathValid (DevicePath, 0)) {
return FALSE;
}
Node = DevicePath;
while (!IsDevicePathEnd (Node)) {
if (IsDevicePathEndInstance (Node)) {
return TRUE;
}
Node = NextDevicePathNode (Node);
}
return FALSE;
return UefiDevicePathLibIsDevicePathMultiInstance (DevicePath);
}
/**
Converts a device node to its string representation.
@param DeviceNode A Pointer to the device node to be converted.
@param DisplayOnly If DisplayOnly is TRUE, then the shorter text representation
of the display node is used, where applicable. If DisplayOnly
is FALSE, then the longer text representation of the display node
is used.
@param AllowShortcuts If AllowShortcuts is TRUE, then the shortcut forms of text
representation for a device node can be used, where applicable.
@return A pointer to the allocated text representation of the device node or NULL if DeviceNode
is NULL or there was insufficient memory.
**/
CHAR16 *
EFIAPI
ConvertDeviceNodeToText (
IN CONST EFI_DEVICE_PATH_PROTOCOL *DeviceNode,
IN BOOLEAN DisplayOnly,
IN BOOLEAN AllowShortcuts
)
{
return UefiDevicePathLibConvertDeviceNodeToText (DeviceNode, DisplayOnly, AllowShortcuts);
}
/**
Retrieves the device path protocol from a handle.
Converts a device path to its text representation.
This function returns the device path protocol from the handle specified by Handle.
If Handle is NULL or Handle does not contain a device path protocol, then NULL
is returned.
@param Handle The handle from which to retrieve the device
path protocol.
@param DevicePath A Pointer to the device to be converted.
@param DisplayOnly If DisplayOnly is TRUE, then the shorter text representation
of the display node is used, where applicable. If DisplayOnly
is FALSE, then the longer text representation of the display node
is used.
@param AllowShortcuts If AllowShortcuts is TRUE, then the shortcut forms of text
representation for a device node can be used, where applicable.
@return The device path protocol from the handle specified by Handle.
@return A pointer to the allocated text representation of the device path or
NULL if DeviceNode is NULL or there was insufficient memory.
**/
CHAR16 *
EFIAPI
ConvertDevicePathToText (
IN CONST EFI_DEVICE_PATH_PROTOCOL *DevicePath,
IN BOOLEAN DisplayOnly,
IN BOOLEAN AllowShortcuts
)
{
return UefiDevicePathLibConvertDevicePathToText (DevicePath, DisplayOnly, AllowShortcuts);
}
/**
Convert text to the binary representation of a device node.
@param TextDeviceNode TextDeviceNode points to the text representation of a device
node. Conversion starts with the first character and continues
until the first non-device node character.
@return A pointer to the EFI device node or NULL if TextDeviceNode is NULL or there was
insufficient memory or text unsupported.
**/
EFI_DEVICE_PATH_PROTOCOL *
EFIAPI
DevicePathFromHandle (
IN EFI_HANDLE Handle
ConvertTextToDeviceNode (
IN CONST CHAR16 *TextDeviceNode
)
{
EFI_DEVICE_PATH_PROTOCOL *DevicePath;
EFI_STATUS Status;
Status = gBS->HandleProtocol (
Handle,
&gEfiDevicePathProtocolGuid,
(VOID *) &DevicePath
);
if (EFI_ERROR (Status)) {
DevicePath = NULL;
}
return DevicePath;
return UefiDevicePathLibConvertTextToDeviceNode (TextDeviceNode);
}
/**
Allocates a device path for a file and appends it to an existing device path.
Convert text to the binary representation of a device path.
If Device is a valid device handle that contains a device path protocol, then a device path for
the file specified by FileName is allocated and appended to the device path associated with the
handle Device. The allocated device path is returned. If Device is NULL or Device is a handle
that does not support the device path protocol, then a device path containing a single device
path node for the file specified by FileName is allocated and returned.
The memory for the new device path is allocated from EFI boot services memory. It is the responsibility
of the caller to free the memory allocated.
If FileName is NULL, then ASSERT().
If FileName is not aligned on a 16-bit boundary, then ASSERT().
@param Device A pointer to a device handle. This parameter
is optional and may be NULL.
@param FileName A pointer to a Null-terminated Unicode string.
@param TextDevicePath TextDevicePath points to the text representation of a device
path. Conversion starts with the first character and continues
until the first non-device node character.
@return The allocated device path.
@return A pointer to the allocated device path or NULL if TextDeviceNode is NULL or
there was insufficient memory.
**/
EFI_DEVICE_PATH_PROTOCOL *
EFIAPI
FileDevicePath (
IN EFI_HANDLE Device, OPTIONAL
IN CONST CHAR16 *FileName
ConvertTextToDevicePath (
IN CONST CHAR16 *TextDevicePath
)
{
UINTN Size;
FILEPATH_DEVICE_PATH *FilePath;
EFI_DEVICE_PATH_PROTOCOL *DevicePath;
EFI_DEVICE_PATH_PROTOCOL *FileDevicePath;
DevicePath = NULL;
Size = StrSize (FileName);
FileDevicePath = AllocatePool (Size + SIZE_OF_FILEPATH_DEVICE_PATH + END_DEVICE_PATH_LENGTH);
if (FileDevicePath != NULL) {
FilePath = (FILEPATH_DEVICE_PATH *) FileDevicePath;
FilePath->Header.Type = MEDIA_DEVICE_PATH;
FilePath->Header.SubType = MEDIA_FILEPATH_DP;
CopyMem (&FilePath->PathName, FileName, Size);
SetDevicePathNodeLength (&FilePath->Header, Size + SIZE_OF_FILEPATH_DEVICE_PATH);
SetDevicePathEndNode (NextDevicePathNode (&FilePath->Header));
if (Device != NULL) {
DevicePath = DevicePathFromHandle (Device);
}
DevicePath = AppendDevicePath (DevicePath, FileDevicePath);
FreePool (FileDevicePath);
}
return DevicePath;
return UefiDevicePathLibConvertTextToDevicePath (TextDevicePath);
}