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Add new API IsDevicePathValid() to UefiDevicePathLib.

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Signed-off-by: Ruiyu Ni<ruiyu.ni@intel.com>
Reviewed-by: Liming Gao<liming.gao@intel.com>
Reviewed-by: Kinney Michael D<michael.d.kinney@intel.com>

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@13737 6f19259b-4bc3-4df7-8a09-765794883524
This commit is contained in:
niruiyu
2012-09-24 03:20:35 +00:00
parent 7f446eba26
commit 771729c77f
6 changed files with 233 additions and 46 deletions
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95
MdePkg/Library/UefiDevicePathLibDevicePathProtocol/UefiDevicePathLib.c
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@ -2,7 +2,7 @@
Library instance that implement UEFI Device Path Library class based on protocol
gEfiDevicePathUtilitiesProtocolGuid.
Copyright (c) 2006 - 2010, Intel Corporation. All rights reserved.<BR>
Copyright (c) 2006 - 2012, 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
@ -24,6 +24,7 @@
#include <Library/MemoryAllocationLib.h>
#include <Library/BaseMemoryLib.h>
#include <Library/UefiBootServicesTableLib.h>
#include <Library/PcdLib.h>
EFI_DEVICE_PATH_UTILITIES_PROTOCOL *mDevicePathUtilities = NULL;
@ -71,6 +72,61 @@ DevicePathLibConstructor (
return Status;
}
/**
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.
@ -136,8 +192,12 @@ DevicePathNodeLength (
IN CONST VOID *Node
)
{
UINTN Length;
ASSERT (Node != NULL);
return ReadUnaligned16 ((UINT16 *)&((EFI_DEVICE_PATH_PROTOCOL *)(Node))->Length[0]);
Length = ReadUnaligned16 ((UINT16 *)&((EFI_DEVICE_PATH_PROTOCOL *)(Node))->Length[0]);
ASSERT (Length >= sizeof (EFI_DEVICE_PATH_PROTOCOL));
return Length;
}
/**
@ -256,7 +316,8 @@ IsDevicePathEndInstance (
be used to set the contents of the Length field.
If Node is NULL, then ASSERT().
If NodeLength >= 0x10000, 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.
@ -272,7 +333,7 @@ SetDevicePathNodeLength (
)
{
ASSERT (Node != NULL);
ASSERT (Length < 0x10000);
ASSERT ((Length >= sizeof (EFI_DEVICE_PATH_PROTOCOL)) && (Length < SIZE_64KB));
return WriteUnaligned16 ((UINT16 *)&((EFI_DEVICE_PATH_PROTOCOL *)(Node))->Length[0], (UINT16)(Length));
}
@ -305,13 +366,14 @@ SetDevicePathEndNode (
/**
Returns the size of a device path in bytes.
This function returns the size, in bytes, of the device path data structure specified by
DevicePath including the end of device path node. If DevicePath is NULL, then 0 is returned.
This function returns the size, in bytes, of the device path data structure
specified by DevicePath including the end of device path node.
If DevicePath is NULL or invalid, then 0 is returned.
@param DevicePath A pointer to a device path data structure.
@retval 0 If DevicePath is NULL.
@retval Others The size of a device path in bytes.
@param DevicePath A pointer to a device path data structure.
@retval 0 If DevicePath is NULL or invalid.
@retval Others The size of a device path in bytes.
**/
UINTN
@ -336,7 +398,7 @@ GetDevicePathSize (
@param DevicePath A pointer to a device path data structure.
@retval NULL If DevicePath is NULL.
@retval NULL If DevicePath is NULL or invalid.
@retval Others A pointer to the duplicated device path.
**/
@ -367,6 +429,7 @@ DuplicateDevicePath (
@param SecondDevicePath A pointer to a device path data structure.
@retval NULL If there is not enough memory for the newly allocated buffer.
@retval NULL If FirstDevicePath or SecondDevicePath is invalid.
@retval Others A pointer to the new device path if success.
Or a copy an end-of-device-path if both FirstDevicePath and
SecondDevicePath are NULL.
@ -431,6 +494,7 @@ AppendDevicePathNode (
path instance and a new end-of-device-path-instance node is inserted between.
If DevicePath is NULL, then a copy if DevicePathInstance is returned.
If DevicePathInstance is NULL, then NULL is returned.
If DevicePath or DevicePathInstance is invalid, then NULL is returned.
If there is not enough memory to allocate space for the new device path, then
NULL is returned.
The memory is allocated from EFI boot services memory. It is the responsibility
@ -524,15 +588,16 @@ CreateDeviceNode (
/**
Determines if a device path is single or multi-instance.
This function returns TRUE if the device path specified by DevicePath is
This function returns TRUE if the device path specified by DevicePath is
multi-instance.
Otherwise, FALSE is returned. If DevicePath is NULL, then FALSE is returned.
Otherwise, FALSE is returned.
If DevicePath is NULL or invalid, then FALSE is returned.
@param DevicePath A pointer to a device path data structure.
@retval TRUE DevicePath is multi-instance.
@retval FALSE DevicePath is not multi-instance or DevicePath
is NULL.
@retval FALSE DevicePath is not multi-instance, or DevicePath
is NULL or invalid.
**/
BOOLEAN