DevicePathUtilities.c revision 4fd606d1f5abe38e1f42c38de1d2e895166bd0f4
/** @file
Implementation file for Device Path Utilities Protocol
Copyright (c) 2006 - 2008, 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
THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
**/
#include "DevicePath.h"
/**
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.
@param DevicePath A pointer to a device path data structure.
@return The size of a device path in bytes.
**/
)
{
return GetDevicePathSize (DevicePath);
}
/**
Creates a new device path by appending a second device path to a first device path.
This function allocates space for a new copy of the device path specified by DevicePath. If
DevicePath is NULL, then NULL is returned. If the memory is successfully allocated, then the
contents of DevicePath are copied to the newly allocated buffer, and a pointer to that buffer
is returned. Otherwise, NULL is returned.
@param DevicePath A pointer to a device path data structure.
@return A pointer to the duplicated device path.
**/
)
{
return DuplicateDevicePath (DevicePath);
}
/**
Creates a new device path by appending a second device path to a first device path.
This function creates a new device path by appending a copy of SecondDevicePath to a copy of
FirstDevicePath in a newly allocated buffer. Only the end-of-device-path device node from
SecondDevicePath is retained. The newly created device path is returned.
If FirstDevicePath is NULL, then it is ignored, and a duplicate of SecondDevicePath is returned.
If SecondDevicePath is NULL, then it is ignored, and a duplicate of FirstDevicePath is returned.
If both FirstDevicePath and SecondDevicePath are NULL, then a copy of an end-of-device-path is
returned.
If there is not enough memory for the newly allocated buffer, then NULL is 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.
@param FirstDevicePath A pointer to a device path data structure.
@param SecondDevicePath A pointer to a device path data structure.
@return A pointer to the new device path.
**/
)
{
}
/**
Creates a new path by appending the device node to the device path.
This function creates a new device path by appending a copy of the device node specified by
DevicePathNode to a copy of the device path specified by DevicePath in an allocated buffer.
The end-of-device-path device node is moved after the end of the appended device node.
If DevicePathNode is NULL then a copy of DevicePath is returned.
If DevicePath is NULL then a copy of DevicePathNode, followed by an end-of-device path device
node is returned.
If both DevicePathNode and DevicePath are NULL then a copy of an end-of-device-path device node
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 of the caller to
free the memory allocated.
@param DevicePath A pointer to a device path data structure.
@param DevicePathNode A pointer to a single device path node.
@return A pointer to the new device path.
**/
)
{
}
/**
Creates a new device path by appending the specified device path instance to the specified device
path.
This function creates a new device path by appending a copy of the device path instance specified
by DevicePathInstance to a copy of the device path specified by DevicePath in a allocated buffer.
The end-of-device-path device node is moved after the end of the appended device 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 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 of the caller to
free the memory allocated.
@param DevicePath A pointer to a device path data structure.
@param DevicePathInstance A pointer to a device path instance.
@return A pointer to the new device path.
**/
)
{
}
/**
Creates a copy of the current device path instance and returns a pointer to the next device path
instance.
This function creates a copy of the current device path instance. It also updates DevicePath to
point to the next device path instance in the device path (or NULL if no more) and updates Size
to hold the size of the device path instance copy.
If DevicePath is NULL, 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 of the caller to
free the memory allocated.
If Size is NULL, then ASSERT().
@param DevicePath On input, this holds the pointer to the current device path
instance. On output, this holds the pointer to the next device
path instance or NULL if there are no more device path
instances in the device path pointer to a device path data
structure.
@param Size On output, this holds the size of the device path instance, in
bytes or zero, if DevicePath is NULL.
@return A pointer to the current device path instance.
**/
)
{
}
/**
Determines if a device path is single or multi-instance.
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.
@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.
**/
)
{
return IsDevicePathMultiInstance (DevicePath);
}
/**
Creates a copy of the current device path instance and returns a pointer to the next device path
instance.
This function creates a new device node in a newly allocated buffer of size NodeLength and
initializes the device path node header with NodeType and NodeSubType. The new device path node
is returned.
If NodeLength is smaller than a device path header, 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 of the caller to
free the memory allocated.
@param NodeType The device node type for the new device node.
@param NodeSubType The device node sub-type for the new device node.
@param NodeLength The length of the new device node.
@return The new device path.
**/
)
{
}