--- /dev/null
+/** @file
+ Serialize Variables Library implementation
+
+ Copyright (c) 2004 - 2011, 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
+ http://opensource.org/licenses/bsd-license.php
+
+ 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 "SerializeVariablesLib.h"
+
+/**
+ Serialization format:
+
+ The SerializeVariablesLib interface does not specify a format
+ for the serialization of the variable data. This library uses
+ a packed array of a non-uniformly sized data structure elements.
+
+ Each variable is stored (packed) as:
+ UINT32 VendorNameSize; // Name size in bytes
+ CHAR16 VendorName[?]; // The variable unicode name including the
+ // null terminating character.
+ EFI_GUID VendorGuid; // The variable GUID
+ UINT32 DataSize; // The size of variable data in bytes
+ UINT8 Data[?]; // The variable data
+
+**/
+
+
+/**
+ Unpacks the next variable from the buffer
+
+ @param[in] Buffer - Buffer pointing to the next variable instance
+ On subsequent calls, the pointer should be incremented
+ by the returned SizeUsed value.
+ @param[in] MaxSize - Max allowable size for the variable data
+ On subsequent calls, this should be decremented
+ by the returned SizeUsed value.
+ @param[out] Name - Variable name string (address in Buffer)
+ @param[out] NameSize - Size of Name in bytes
+ @param[out] Guid - GUID of variable (address in Buffer)
+ @param[out] Attributes - Attributes of variable
+ @param[out] Data - Buffer containing Data for variable (address in Buffer)
+ @param[out] DataSize - Size of Data in bytes
+ @param[out] SizeUsed - Total size used for this variable instance in Buffer
+
+ @return EFI_STATUS based on the success or failure of the operation
+
+**/
+STATIC
+EFI_STATUS
+UnpackVariableFromBuffer (
+ IN VOID *Buffer,
+ IN UINTN MaxSize,
+ OUT CHAR16 **Name,
+ OUT UINT32 *NameSize,
+ OUT EFI_GUID **Guid,
+ OUT UINT32 *Attributes,
+ OUT UINT32 *DataSize,
+ OUT VOID **Data,
+ OUT UINTN *SizeUsed
+ )
+{
+ UINT8 *BytePtr;
+ UINTN Offset;
+
+ BytePtr = (UINT8*)Buffer;
+ Offset = 0;
+
+ *NameSize = *(UINT32*) (BytePtr + Offset);
+ Offset = Offset + sizeof (UINT32);
+
+ if (Offset > MaxSize) {
+ return EFI_INVALID_PARAMETER;
+ }
+
+ *Name = (CHAR16*) (BytePtr + Offset);
+ Offset = Offset + *(UINT32*)BytePtr;
+ if (Offset > MaxSize) {
+ return EFI_INVALID_PARAMETER;
+ }
+
+ *Guid = (EFI_GUID*) (BytePtr + Offset);
+ Offset = Offset + sizeof (EFI_GUID);
+ if (Offset > MaxSize) {
+ return EFI_INVALID_PARAMETER;
+ }
+
+ *Attributes = *(UINT32*) (BytePtr + Offset);
+ Offset = Offset + sizeof (UINT32);
+ if (Offset > MaxSize) {
+ return EFI_INVALID_PARAMETER;
+ }
+
+ *DataSize = *(UINT32*) (BytePtr + Offset);
+ Offset = Offset + sizeof (UINT32);
+ if (Offset > MaxSize) {
+ return EFI_INVALID_PARAMETER;
+ }
+
+ *Data = (VOID*) (BytePtr + Offset);
+ Offset = Offset + *DataSize;
+ if (Offset > MaxSize) {
+ return EFI_INVALID_PARAMETER;
+ }
+
+ *SizeUsed = Offset;
+
+ return EFI_SUCCESS;
+}
+
+
+/**
+ Iterates through the variables in the buffer, and calls a callback
+ function for each variable found.
+
+ @param[in] CallbackFunction - Function called for each variable instance
+ @param[in] Context - Passed to each call of CallbackFunction
+ @param[in] Buffer - Buffer containing serialized variables
+ @param[in] MaxSize - Size of Buffer in bytes
+
+ @return EFI_STATUS based on the success or failure of the operation
+
+**/
+STATIC
+EFI_STATUS
+IterateVariablesInBuffer (
+ IN VARIABLE_SERIALIZATION_ITERATION_CALLBACK CallbackFunction,
+ IN VOID *CallbackContext,
+ IN VOID *Buffer,
+ IN UINTN MaxSize
+ )
+{
+ RETURN_STATUS Status;
+ UINTN Count;
+ UINTN TotalSizeUsed;
+ UINTN SizeUsed;
+
+ CHAR16 *Name;
+ UINT32 NameSize;
+ CHAR16 *AlignedName;
+ UINT32 AlignedNameMaxSize;
+ EFI_GUID *Guid;
+ UINT32 Attributes;
+ UINT32 DataSize;
+ VOID *Data;
+
+ SizeUsed = 0;
+ AlignedName = NULL;
+ AlignedNameMaxSize = 0;
+ Name = NULL;
+ Guid = NULL;
+ Attributes = 0;
+ DataSize = 0;
+ Data = NULL;
+
+ for (
+ Status = EFI_SUCCESS, Count = 0, TotalSizeUsed = 0;
+ !EFI_ERROR (Status) && (TotalSizeUsed < MaxSize);
+ ) {
+ Status = UnpackVariableFromBuffer (
+ (VOID*) ((UINT8*) Buffer + TotalSizeUsed),
+ (MaxSize - TotalSizeUsed),
+ &Name,
+ &NameSize,
+ &Guid,
+ &Attributes,
+ &DataSize,
+ &Data,
+ &SizeUsed
+ );
+ if (EFI_ERROR (Status)) {
+ return Status;
+ }
+
+ //
+ // We copy the name to a separately allocated buffer,
+ // to be sure it is 16-bit aligned.
+ //
+ if (NameSize > AlignedNameMaxSize) {
+ if (AlignedName != NULL) {
+ FreePool (AlignedName);
+ }
+ AlignedName = AllocatePool (NameSize);
+ }
+ if (AlignedName == NULL) {
+ return EFI_OUT_OF_RESOURCES;
+ }
+ CopyMem (AlignedName, Name, NameSize);
+
+ TotalSizeUsed = TotalSizeUsed + SizeUsed;
+
+ //
+ // Run the callback function
+ //
+ Status = (*CallbackFunction) (
+ CallbackContext,
+ AlignedName,
+ Guid,
+ Attributes,
+ DataSize,
+ Data
+ );
+
+ }
+
+ if (AlignedName != NULL) {
+ FreePool (AlignedName);
+ }
+
+ //
+ // Make sure the entire buffer was used, or else return an error
+ //
+ if (TotalSizeUsed != MaxSize) {
+ DEBUG ((
+ EFI_D_ERROR,
+ "Deserialize variables error: TotalSizeUsed(%d) != MaxSize(%d)\n",
+ TotalSizeUsed,
+ MaxSize
+ ));
+ return EFI_INVALID_PARAMETER;
+ }
+
+ return EFI_SUCCESS;
+}
+
+
+STATIC
+RETURN_STATUS
+EFIAPI
+IterateVariablesCallbackNop (
+ IN VOID *Context,
+ IN CHAR16 *VariableName,
+ IN EFI_GUID *VendorGuid,
+ IN UINT32 Attributes,
+ IN UINTN DataSize,
+ IN VOID *Data
+ )
+{
+ return RETURN_SUCCESS;
+}
+
+
+STATIC
+RETURN_STATUS
+EFIAPI
+IterateVariablesCallbackSetInInstance (
+ IN VOID *Context,
+ IN CHAR16 *VariableName,
+ IN EFI_GUID *VendorGuid,
+ IN UINT32 Attributes,
+ IN UINTN DataSize,
+ IN VOID *Data
+ )
+{
+ EFI_HANDLE Instance;
+
+ Instance = (EFI_HANDLE) Context;
+
+ return SerializeVariablesAddVariable (
+ Instance,
+ VariableName,
+ VendorGuid,
+ Attributes,
+ DataSize,
+ Data
+ );
+}
+
+
+STATIC
+RETURN_STATUS
+EFIAPI
+IterateVariablesCallbackSetSystemVariable (
+ IN VOID *Context,
+ IN CHAR16 *VariableName,
+ IN EFI_GUID *VendorGuid,
+ IN UINT32 Attributes,
+ IN UINTN DataSize,
+ IN VOID *Data
+ )
+{
+ return gRT->SetVariable (
+ VariableName,
+ VendorGuid,
+ Attributes,
+ DataSize,
+ Data
+ );
+}
+
+
+STATIC
+RETURN_STATUS
+EnsureExtraBufferSpace (
+ IN SV_INSTANCE *Instance,
+ IN UINTN Size
+ )
+{
+ VOID *NewBuffer;
+ UINTN NewSize;
+
+ NewSize = Instance->DataSize + Size;
+ if (NewSize <= Instance->BufferSize) {
+ return RETURN_SUCCESS;
+ }
+
+ //
+ // Double the required size to lessen the need to re-allocate in the future
+ //
+ NewSize = 2 * NewSize;
+
+ NewBuffer = AllocatePool (NewSize);
+ if (NewBuffer == NULL) {
+ return RETURN_OUT_OF_RESOURCES;
+ }
+
+ if (Instance->BufferPtr != NULL) {
+ CopyMem (NewBuffer, Instance->BufferPtr, Instance->DataSize);
+ FreePool (Instance->BufferPtr);
+ }
+
+ Instance->BufferPtr = NewBuffer;
+ Instance->BufferSize = NewSize;
+
+ return RETURN_SUCCESS;
+}
+
+
+STATIC
+VOID
+AppendToBuffer (
+ IN SV_INSTANCE *Instance,
+ IN VOID *Data,
+ IN UINTN Size
+ )
+{
+ UINTN NewSize;
+
+ ASSERT (Instance != NULL);
+ ASSERT (Data != NULL);
+
+ NewSize = Instance->DataSize + Size;
+ ASSERT ((Instance->DataSize + Size) <= Instance->BufferSize);
+
+ CopyMem (
+ (VOID*) (((UINT8*) (Instance->BufferPtr)) + Instance->DataSize),
+ Data,
+ Size
+ );
+
+ Instance->DataSize = NewSize;
+}
+
+
+/**
+ Creates a new variable serialization instance
+
+ @param[out] Handle - Handle for a variable serialization instance
+
+ @retval RETURN_SUCCESS - The variable serialization instance was
+ successfully created.
+ @retval RETURN_OUT_OF_RESOURCES - There we not enough resources to
+ create the variable serialization instance.
+
+**/
+RETURN_STATUS
+EFIAPI
+SerializeVariablesNewInstance (
+ OUT EFI_HANDLE *Handle
+ )
+{
+ SV_INSTANCE *New;
+
+ New = AllocateZeroPool (sizeof (*New));
+ if (New == NULL) {
+ return RETURN_OUT_OF_RESOURCES;
+ }
+
+ New->Signature = SV_SIGNATURE;
+
+ *Handle = (EFI_HANDLE) New;
+ return RETURN_SUCCESS;
+}
+
+
+/**
+ Free memory associated with a variable serialization instance
+
+ @param[in] Handle - Handle for a variable serialization instance
+
+ @retval RETURN_SUCCESS - The variable serialization instance was
+ successfully freed.
+ @retval RETURN_INVALID_PARAMETER - Handle was not a valid
+ variable serialization instance.
+
+**/
+RETURN_STATUS
+EFIAPI
+SerializeVariablesFreeInstance (
+ IN EFI_HANDLE Handle
+ )
+{
+ SV_INSTANCE *Instance;
+
+ Instance = SV_FROM_HANDLE (Handle);
+
+ if (Instance->Signature != SV_SIGNATURE) {
+ return RETURN_INVALID_PARAMETER;
+ }
+
+ Instance->Signature = 0;
+
+ if (Instance->BufferPtr != NULL) {
+ FreePool (Instance->BufferPtr);
+ }
+
+ FreePool (Instance);
+
+ return RETURN_SUCCESS;
+}
+
+
+/**
+ Creates a new variable serialization instance using the given
+ binary representation of the variables to fill the new instance
+
+ @param[out] Handle - Handle for a variable serialization instance
+ @param[in] Buffer - A buffer with the serialized representation
+ of the variables. Must be the same format as produced
+ by SerializeVariablesToBuffer.
+ @param[in] Size - This is the size of the binary representation
+ of the variables.
+
+ @retval RETURN_SUCCESS - The binary representation was successfully
+ imported into a new variable serialization instance
+ @retval RETURN_OUT_OF_RESOURCES - There we not enough resources to
+ create the new variable serialization instance
+
+**/
+RETURN_STATUS
+EFIAPI
+SerializeVariablesNewInstanceFromBuffer (
+ OUT EFI_HANDLE *Handle,
+ IN VOID *Buffer,
+ IN UINTN Size
+ )
+{
+ RETURN_STATUS Status;
+
+ Status = SerializeVariablesNewInstance (Handle);
+ if (RETURN_ERROR (Status)) {
+ return Status;
+ }
+
+ Status = IterateVariablesInBuffer (
+ IterateVariablesCallbackNop,
+ NULL,
+ Buffer,
+ Size
+ );
+ if (RETURN_ERROR (Status)) {
+ SerializeVariablesFreeInstance (*Handle);
+ return Status;
+ }
+
+ Status = IterateVariablesInBuffer (
+ IterateVariablesCallbackSetInInstance,
+ (VOID*) *Handle,
+ Buffer,
+ Size
+ );
+ if (RETURN_ERROR (Status)) {
+ SerializeVariablesFreeInstance (*Handle);
+ return Status;
+ }
+
+ return Status;
+}
+
+
+/**
+ Iterates all variables found with RuntimeServices GetNextVariableName
+
+ @param[in] CallbackFunction - Function called for each variable instance
+ @param[in] Context - Passed to each call of CallbackFunction
+
+ @retval RETURN_SUCCESS - All variables were iterated without the
+ CallbackFunction returning an error
+ @retval RETURN_OUT_OF_RESOURCES - There we not enough resources to
+ iterate through the variables
+ @return Any of RETURN_ERROR indicates an error reading the variable
+ or an error was returned from CallbackFunction
+
+**/
+RETURN_STATUS
+EFIAPI
+SerializeVariablesIterateSystemVariables (
+ IN VARIABLE_SERIALIZATION_ITERATION_CALLBACK CallbackFunction,
+ IN VOID *Context
+ )
+{
+ RETURN_STATUS Status;
+ UINTN VariableNameBufferSize;
+ UINTN VariableNameSize;
+ CHAR16 *VariableName;
+ EFI_GUID VendorGuid;
+ UINTN VariableDataBufferSize;
+ UINTN VariableDataSize;
+ VOID *VariableData;
+ UINT32 VariableAttributes;
+ VOID *NewBuffer;
+
+ //
+ // Initialize the variable name and data buffer variables.
+ //
+ VariableNameBufferSize = sizeof (CHAR16);
+ VariableName = AllocateZeroPool (VariableNameBufferSize);
+
+ VariableDataBufferSize = 0;
+ VariableData = NULL;
+
+ for (;;) {
+ //
+ // Get the next variable name and guid
+ //
+ VariableNameSize = VariableNameBufferSize;
+ Status = gRT->GetNextVariableName (
+ &VariableNameSize,
+ VariableName,
+ &VendorGuid
+ );
+ if (Status == EFI_BUFFER_TOO_SMALL) {
+ //
+ // The currently allocated VariableName buffer is too small,
+ // so we allocate a larger buffer, and copy the old buffer
+ // to it.
+ //
+ NewBuffer = AllocatePool (VariableNameSize);
+ if (NewBuffer == NULL) {
+ Status = EFI_OUT_OF_RESOURCES;
+ break;
+ }
+ CopyMem (NewBuffer, VariableName, VariableNameBufferSize);
+ if (VariableName != NULL) {
+ FreePool (VariableName);
+ }
+ VariableName = NewBuffer;
+ VariableNameBufferSize = VariableNameSize;
+
+ //
+ // Try to get the next variable name again with the larger buffer.
+ //
+ Status = gRT->GetNextVariableName (
+ &VariableNameSize,
+ VariableName,
+ &VendorGuid
+ );
+ }
+
+ if (EFI_ERROR (Status)) {
+ if (Status == EFI_NOT_FOUND) {
+ Status = EFI_SUCCESS;
+ }
+ break;
+ }
+
+ //
+ // Get the variable data and attributes
+ //
+ VariableDataSize = VariableDataBufferSize;
+ Status = gRT->GetVariable (
+ VariableName,
+ &VendorGuid,
+ &VariableAttributes,
+ &VariableDataSize,
+ VariableData
+ );
+ if (Status == EFI_BUFFER_TOO_SMALL) {
+ //
+ // The currently allocated VariableData buffer is too small,
+ // so we allocate a larger buffer.
+ //
+ if (VariableDataBufferSize != 0) {
+ FreePool (VariableData);
+ VariableData = NULL;
+ VariableDataBufferSize = 0;
+ }
+ VariableData = AllocatePool (VariableDataSize);
+ if (VariableData == NULL) {
+ Status = EFI_OUT_OF_RESOURCES;
+ break;
+ }
+ VariableDataBufferSize = VariableDataSize;
+
+ //
+ // Try to read the variable again with the larger buffer.
+ //
+ Status = gRT->GetVariable (
+ VariableName,
+ &VendorGuid,
+ &VariableAttributes,
+ &VariableDataSize,
+ VariableData
+ );
+ }
+ if (EFI_ERROR (Status)) {
+ break;
+ }
+
+ //
+ // Run the callback function
+ //
+ Status = (*CallbackFunction) (
+ Context,
+ VariableName,
+ &VendorGuid,
+ VariableAttributes,
+ VariableDataSize,
+ VariableData
+ );
+ if (EFI_ERROR (Status)) {
+ break;
+ }
+
+ }
+
+ if (VariableName != NULL) {
+ FreePool (VariableName);
+ }
+
+ if (VariableData != NULL) {
+ FreePool (VariableData);
+ }
+
+ return Status;
+}
+
+
+/**
+ Iterates all variables found in the variable serialization instance
+
+ @param[in] Handle - Handle for a variable serialization instance
+ @param[in] CallbackFunction - Function called for each variable instance
+ @param[in] Context - Passed to each call of CallbackFunction
+
+ @retval RETURN_SUCCESS - All variables were iterated without the
+ CallbackFunction returning an error
+ @retval RETURN_OUT_OF_RESOURCES - There we not enough resources to
+ iterate through the variables
+ @return Any of RETURN_ERROR indicates an error reading the variable
+ or an error was returned from CallbackFunction
+
+**/
+RETURN_STATUS
+EFIAPI
+SerializeVariablesIterateInstanceVariables (
+ IN EFI_HANDLE Handle,
+ IN VARIABLE_SERIALIZATION_ITERATION_CALLBACK CallbackFunction,
+ IN VOID *Context
+ )
+{
+ SV_INSTANCE *Instance;
+
+ Instance = SV_FROM_HANDLE (Handle);
+
+ if ((Instance->BufferPtr != NULL) && (Instance->DataSize != 0)) {
+ return IterateVariablesInBuffer (
+ CallbackFunction,
+ Context,
+ Instance->BufferPtr,
+ Instance->DataSize
+ );
+ } else {
+ return RETURN_SUCCESS;
+ }
+}
+
+
+/**
+ Sets all variables found in the variable serialization instance
+
+ @param[in] Handle - Handle for a variable serialization instance
+
+ @retval RETURN_SUCCESS - All variables were set successfully
+ @retval RETURN_OUT_OF_RESOURCES - There we not enough resources to
+ set all the variables
+ @return Any of RETURN_ERROR indicates an error reading the variables
+ or in attempting to set a variable
+
+**/
+RETURN_STATUS
+EFIAPI
+SerializeVariablesSetSerializedVariables (
+ IN EFI_HANDLE Handle
+ )
+{
+ return SerializeVariablesIterateInstanceVariables (
+ Handle,
+ IterateVariablesCallbackSetSystemVariable,
+ NULL
+ );
+}
+
+
+/**
+ Adds a variable to the variable serialization instance
+
+ @param[in] Handle - Handle for a variable serialization instance
+ @param[in] VariableName - Refer to RuntimeServices GetVariable
+ @param[in] VendorGuid - Refer to RuntimeServices GetVariable
+ @param[in] Attributes - Refer to RuntimeServices GetVariable
+ @param[in] DataSize - Refer to RuntimeServices GetVariable
+ @param[in] Data - Refer to RuntimeServices GetVariable
+
+ @retval RETURN_SUCCESS - All variables were set successfully
+ @retval RETURN_OUT_OF_RESOURCES - There we not enough resources to
+ add the variable
+ @retval RETURN_INVALID_PARAMETER - Handle was not a valid
+ variable serialization instance or
+ VariableName, VariableGuid or Data are NULL.
+
+**/
+RETURN_STATUS
+EFIAPI
+SerializeVariablesAddVariable (
+ IN EFI_HANDLE Handle,
+ IN CHAR16 *VariableName,
+ IN EFI_GUID *VendorGuid,
+ IN UINT32 Attributes,
+ IN UINTN DataSize,
+ IN VOID *Data
+ )
+{
+ RETURN_STATUS Status;
+ SV_INSTANCE *Instance;
+ UINT32 SerializedNameSize;
+ UINT32 SerializedDataSize;
+ UINTN SerializedSize;
+
+ Instance = SV_FROM_HANDLE (Handle);
+
+ if ((Instance->Signature != SV_SIGNATURE) ||
+ (VariableName == NULL) || (VendorGuid == NULL) || (Data == NULL)) {
+ }
+
+ SerializedNameSize = (UINT32) StrSize (VariableName);
+
+ SerializedSize =
+ sizeof (SerializedNameSize) +
+ SerializedNameSize +
+ sizeof (*VendorGuid) +
+ sizeof (Attributes) +
+ sizeof (SerializedDataSize) +
+ DataSize;
+
+ Status = EnsureExtraBufferSpace (
+ Instance,
+ SerializedSize
+ );
+ if (RETURN_ERROR (Status)) {
+ return Status;
+ }
+
+ //
+ // Add name size (UINT32)
+ //
+ AppendToBuffer (Instance, (VOID*) &SerializedNameSize, sizeof (SerializedNameSize));
+
+ //
+ // Add variable unicode name string
+ //
+ AppendToBuffer (Instance, (VOID*) VariableName, SerializedNameSize);
+
+ //
+ // Add variable GUID
+ //
+ AppendToBuffer (Instance, (VOID*) VendorGuid, sizeof (*VendorGuid));
+
+ //
+ // Add variable attributes
+ //
+ AppendToBuffer (Instance, (VOID*) &Attributes, sizeof (Attributes));
+
+ //
+ // Add variable data size (UINT32)
+ //
+ SerializedDataSize = (UINT32) DataSize;
+ AppendToBuffer (Instance, (VOID*) &SerializedDataSize, sizeof (SerializedDataSize));
+
+ //
+ // Add variable data
+ //
+ AppendToBuffer (Instance, Data, DataSize);
+
+ return RETURN_SUCCESS;
+}
+
+
+/**
+ Serializes the variables known to this instance into the
+ provided buffer.
+
+ @param[in] Handle - Handle for a variable serialization instance
+ @param[out] Buffer - A buffer to store the binary representation
+ of the variables.
+ @param[in,out] Size - On input this is the size of the buffer.
+ On output this is the size of the binary representation
+ of the variables.
+
+ @retval RETURN_SUCCESS - The binary representation was successfully
+ completed and returned in the buffer.
+ @retval RETURN_OUT_OF_RESOURCES - There we not enough resources to
+ save the variables to the buffer.
+ @retval RETURN_INVALID_PARAMETER - Handle was not a valid
+ variable serialization instance or
+ Size or Buffer were NULL.
+ @retval RETURN_BUFFER_TOO_SMALL - The Buffer size as indicated by
+ the Size parameter was too small for the serialized
+ variable data. Size is returned with the required size.
+
+**/
+RETURN_STATUS
+EFIAPI
+SerializeVariablesToBuffer (
+ IN EFI_HANDLE Handle,
+ OUT VOID *Buffer,
+ IN OUT UINTN *Size
+ )
+{
+ SV_INSTANCE *Instance;
+
+ Instance = SV_FROM_HANDLE (Handle);
+
+ if (Size == NULL) {
+ return RETURN_INVALID_PARAMETER;
+ }
+
+ if (*Size < Instance->DataSize) {
+ *Size = Instance->DataSize;
+ return RETURN_BUFFER_TOO_SMALL;
+ }
+
+ if (Buffer == NULL) {
+ return RETURN_INVALID_PARAMETER;
+ }
+
+ *Size = Instance->DataSize;
+ CopyMem (Buffer, Instance->BufferPtr, Instance->DataSize);
+
+ return RETURN_SUCCESS;
+}
+
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