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audk/MdePkg/Library/IfrSupportLib/UefiIfrForm.c

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/** @file
Utility functions which helps in opcode creation, HII configuration string manipulations,
pop up window creations, setup browser persistence data set and get.
Copyright (c) 2007- 2008, Intel Corporation
All rights reserved. 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 "UefiIfrLibraryInternal.h"
STATIC CONST EFI_FORM_BROWSER2_PROTOCOL *mFormBrowser2 = NULL;
STATIC CONST EFI_HII_CONFIG_ROUTING_PROTOCOL *mHiiConfigRouting = NULL;
/**
This function locate FormBrowser2 protocols for later usage.
@return Status the status to locate protocol.
**/
EFI_STATUS
LocateFormBrowser2Protocols (
VOID
)
{
EFI_STATUS Status;
//
// Locate protocols for later usage
//
if (mFormBrowser2 == NULL) {
Status = gBS->LocateProtocol (&gEfiFormBrowser2ProtocolGuid, NULL, (VOID **) &mFormBrowser2);
if (EFI_ERROR (Status)) {
return Status;
}
}
if (mHiiConfigRouting == NULL) {
Status = gBS->LocateProtocol (&gEfiHiiConfigRoutingProtocolGuid, NULL, (VOID **) &mHiiConfigRouting);
if (EFI_ERROR (Status)) {
return Status;
}
}
return EFI_SUCCESS;
}
//
// Fake <ConfigHdr>
//
GLOBAL_REMOVE_IF_UNREFERENCED CONST UINT16 mFakeConfigHdr[] = L"GUID=00000000000000000000000000000000&NAME=0000&PATH=0";
/**
Draw a dialog and return the selected key.
@param NumberOfLines The number of lines for the dialog box
@param KeyValue The EFI_KEY value returned if HotKey is TRUE..
@param String Pointer to the first string in the list
@param ... A series of (quantity == NumberOfLines - 1) text
strings which will be used to construct the dialog
box
@retval EFI_SUCCESS Displayed dialog and received user interaction
@retval EFI_INVALID_PARAMETER One of the parameters was invalid.
@retval EFI_OUT_OF_RESOURCES There is no enough available memory space.
**/
EFI_STATUS
EFIAPI
IfrLibCreatePopUp2 (
IN UINTN NumberOfLines,
OUT EFI_INPUT_KEY *KeyValue,
IN VA_LIST Marker
)
{
UINTN Index;
UINTN Count;
UINTN Start;
UINTN Top;
CHAR16 *StringPtr;
UINTN LeftColumn;
UINTN RightColumn;
UINTN TopRow;
UINTN BottomRow;
UINTN DimensionsWidth;
UINTN DimensionsHeight;
EFI_INPUT_KEY Key;
UINTN LargestString;
CHAR16 *StackString;
EFI_STATUS Status;
UINTN StringLen;
CHAR16 *LineBuffer;
CHAR16 **StringArray;
EFI_EVENT TimerEvent;
EFI_EVENT WaitList[2];
UINTN CurrentAttribute;
EFI_SIMPLE_TEXT_OUTPUT_PROTOCOL *ConOut;
CHAR16 *String;
String = VA_ARG (Marker, CHAR16 *);
if ((KeyValue == NULL) || (String == NULL)) {
return EFI_INVALID_PARAMETER;
}
TopRow = 0;
BottomRow = 0;
LeftColumn = 0;
RightColumn = 0;
ConOut = gST->ConOut;
ConOut->QueryMode (ConOut, ConOut->Mode->Mode, &RightColumn, &BottomRow);
DimensionsWidth = RightColumn - LeftColumn;
DimensionsHeight = BottomRow - TopRow;
CurrentAttribute = ConOut->Mode->Attribute;
LineBuffer = AllocateZeroPool (DimensionsWidth * sizeof (CHAR16));
if (LineBuffer == NULL) {
return EFI_OUT_OF_RESOURCES;
}
//
// Determine the largest string in the dialog box
// Notice we are starting with 1 since String is the first string
//
StringArray = AllocateZeroPool (NumberOfLines * sizeof (CHAR16 *));
if (StringArray == NULL) {
FreePool (LineBuffer);
return EFI_OUT_OF_RESOURCES;
}
LargestString = StrLen (String);
StringArray[0] = String;
for (Index = 1; Index < NumberOfLines; Index++) {
StackString = VA_ARG (Marker, CHAR16 *);
if (StackString == NULL) {
FreePool (LineBuffer);
FreePool (StringArray);
return EFI_INVALID_PARAMETER;
}
StringArray[Index] = StackString;
StringLen = StrLen (StackString);
if (StringLen > LargestString) {
LargestString = StringLen;
}
}
if ((LargestString + 2) > DimensionsWidth) {
LargestString = DimensionsWidth - 2;
}
//
// Subtract the PopUp width from total Columns, allow for one space extra on
// each end plus a border.
//
Start = (DimensionsWidth - LargestString - 2) / 2 + LeftColumn + 1;
Top = ((DimensionsHeight - NumberOfLines - 2) / 2) + TopRow - 1;
//
// Disable cursor
//
ConOut->EnableCursor (ConOut, FALSE);
ConOut->SetAttribute (ConOut, EFI_LIGHTGRAY | EFI_BACKGROUND_BLUE);
StringPtr = &LineBuffer[0];
*StringPtr++ = BOXDRAW_DOWN_RIGHT;
for (Index = 0; Index < LargestString; Index++) {
*StringPtr++ = BOXDRAW_HORIZONTAL;
}
*StringPtr++ = BOXDRAW_DOWN_LEFT;
*StringPtr = L'\0';
ConOut->SetCursorPosition (ConOut, Start, Top);
ConOut->OutputString (ConOut, LineBuffer);
for (Index = 0; Index < NumberOfLines; Index++) {
StringPtr = &LineBuffer[0];
*StringPtr++ = BOXDRAW_VERTICAL;
for (Count = 0; Count < LargestString; Count++) {
StringPtr[Count] = L' ';
}
StringLen = StrLen (StringArray[Index]);
if (StringLen > LargestString) {
StringLen = LargestString;
}
CopyMem (
StringPtr + ((LargestString - StringLen) / 2),
StringArray[Index],
StringLen * sizeof (CHAR16)
);
StringPtr += LargestString;
*StringPtr++ = BOXDRAW_VERTICAL;
*StringPtr = L'\0';
ConOut->SetCursorPosition (ConOut, Start, Top + 1 + Index);
ConOut->OutputString (ConOut, LineBuffer);
}
StringPtr = &LineBuffer[0];
*StringPtr++ = BOXDRAW_UP_RIGHT;
for (Index = 0; Index < LargestString; Index++) {
*StringPtr++ = BOXDRAW_HORIZONTAL;
}
*StringPtr++ = BOXDRAW_UP_LEFT;
*StringPtr = L'\0';
ConOut->SetCursorPosition (ConOut, Start, Top + NumberOfLines + 1);
ConOut->OutputString (ConOut, LineBuffer);
do {
Status = gBS->CreateEvent (EVT_TIMER, 0, NULL, NULL, &TimerEvent);
//
// Set a timer event of 1 second expiration
//
gBS->SetTimer (
TimerEvent,
TimerRelative,
10000000
);
//
// Wait for the keystroke event or the timer
//
WaitList[0] = gST->ConIn->WaitForKey;
WaitList[1] = TimerEvent;
Status = gBS->WaitForEvent (2, WaitList, &Index);
//
// Check for the timer expiration
//
if (!EFI_ERROR (Status) && Index == 1) {
Status = EFI_TIMEOUT;
}
gBS->CloseEvent (TimerEvent);
} while (Status == EFI_TIMEOUT);
Status = gST->ConIn->ReadKeyStroke (gST->ConIn, &Key);
CopyMem (KeyValue, &Key, sizeof (EFI_INPUT_KEY));
ConOut->SetAttribute (ConOut, CurrentAttribute);
ConOut->EnableCursor (ConOut, TRUE);
FreePool (LineBuffer);
FreePool (StringArray);
return Status;
}
/**
Draw a dialog and return the selected key.
@param NumberOfLines The number of lines for the dialog box
@param KeyValue The EFI_KEY value returned if HotKey is TRUE..
@param String Pointer to the first string in the list
@param ... A series of (quantity == NumberOfLines - 1) text
strings which will be used to construct the dialog
box
@retval EFI_SUCCESS Displayed dialog and received user interaction
@retval EFI_INVALID_PARAMETER One of the parameters was invalid.
**/
EFI_STATUS
EFIAPI
IfrLibCreatePopUp (
IN UINTN NumberOfLines,
OUT EFI_INPUT_KEY *KeyValue,
IN CHAR16 *String,
...
)
{
EFI_STATUS Status;
VA_LIST Marker;
VA_START (Marker, KeyValue);
Status = IfrLibCreatePopUp2 (NumberOfLines, KeyValue, Marker);
VA_END (Marker);
return Status;
}
/**
Swap bytes in the buffer. This is a internal function.
@param Buffer Binary buffer.
@param BufferSize Size of the buffer in bytes.
@return None.
**/
VOID
SwapBuffer (
IN OUT UINT8 *Buffer,
IN UINTN BufferSize
)
{
UINTN Index;
UINT8 Temp;
UINTN SwapCount;
SwapCount = BufferSize / 2;
for (Index = 0; Index < SwapCount; Index++) {
Temp = Buffer[Index];
Buffer[Index] = Buffer[BufferSize - 1 - Index];
Buffer[BufferSize - 1 - Index] = Temp;
}
}
/**
Converts the unicode character of the string from uppercase to lowercase.
This is a internal function.
@param Str String to be converted
**/
VOID
EFIAPI
ToLower (
IN OUT CHAR16 *Str
)
{
CHAR16 *Ptr;
for (Ptr = Str; *Ptr != L'\0'; Ptr++) {
if (*Ptr >= L'A' && *Ptr <= L'Z') {
*Ptr = (CHAR16) (*Ptr - L'A' + L'a');
}
}
}
/**
Converts binary buffer to Unicode string in reversed byte order from BufToHexString().
@param Str String for output
@param Buffer Binary buffer.
@param BufferSize Size of the buffer in bytes.
@retval EFI_SUCCESS The function completed successfully.
@retval EFI_OUT_OF_RESOURCES There is no enough available memory space.
**/
EFI_STATUS
EFIAPI
BufferToHexString (
IN OUT CHAR16 *Str,
IN UINT8 *Buffer,
IN UINTN BufferSize
)
{
EFI_STATUS Status;
UINT8 *NewBuffer;
UINTN StrBufferLen;
NewBuffer = AllocateCopyPool (BufferSize, Buffer);
if (NewBuffer == NULL) {
return EFI_OUT_OF_RESOURCES;
}
SwapBuffer (NewBuffer, BufferSize);
StrBufferLen = BufferSize * sizeof (CHAR16) + 1;
Status = BufToHexString (Str, &StrBufferLen, NewBuffer, BufferSize);
FreePool (NewBuffer);
//
// Convert the uppercase to lowercase since <HexAf> is defined in lowercase format.
//
ToLower (Str);
return Status;
}
/**
Converts Hex String to binary buffer in reversed byte order from HexStringToBuf().
@param Buffer Pointer to buffer that receives the data.
@param BufferSize Length in bytes of the buffer to hold converted
data. If routine return with EFI_SUCCESS,
containing length of converted data. If routine
return with EFI_BUFFER_TOO_SMALL, containg length
of buffer desired.
@param Str String to be converted from.
@retval EFI_SUCCESS The function completed successfully.
**/
EFI_STATUS
EFIAPI
HexStringToBuffer (
IN OUT UINT8 *Buffer,
IN OUT UINTN *BufferSize,
IN CHAR16 *Str
)
{
EFI_STATUS Status;
UINTN ConvertedStrLen;
ConvertedStrLen = 0;
Status = HexStringToBuf (Buffer, BufferSize, Str, &ConvertedStrLen);
if (!EFI_ERROR (Status)) {
SwapBuffer (Buffer, ConvertedStrLen);
}
return Status;
}
/**
Convert binary representation Config string (e.g. "0041004200430044") to the
original string (e.g. "ABCD"). Config string appears in <ConfigHdr> (i.e.
"&NAME=<string>"), or Name/Value pair in <ConfigBody> (i.e. "label=<string>").
@param UnicodeString Original Unicode string.
@param StrBufferLen On input: Length in bytes of buffer to hold the Unicode string.
Includes tailing '\0' character.
On output:
If return EFI_SUCCESS, containing length of Unicode string buffer.
If return EFI_BUFFER_TOO_SMALL, containg length of string buffer desired.
@param ConfigString Binary representation of Unicode String, <string> := (<HexCh>4)+
@retval EFI_SUCCESS Routine success.
@retval EFI_BUFFER_TOO_SMALL The string buffer is too small.
**/
EFI_STATUS
EFIAPI
ConfigStringToUnicode (
IN OUT CHAR16 *UnicodeString,
IN OUT UINTN *StrBufferLen,
IN CHAR16 *ConfigString
)
{
UINTN Index;
UINTN Len;
UINTN BufferSize;
CHAR16 BackupChar;
Len = StrLen (ConfigString) / 4;
BufferSize = (Len + 1) * sizeof (CHAR16);
if (*StrBufferLen < BufferSize) {
*StrBufferLen = BufferSize;
return EFI_BUFFER_TOO_SMALL;
}
*StrBufferLen = BufferSize;
for (Index = 0; Index < Len; Index++) {
BackupChar = ConfigString[4];
ConfigString[4] = L'\0';
HexStringToBuf ((UINT8 *) UnicodeString, &BufferSize, ConfigString, NULL);
ConfigString[4] = BackupChar;
ConfigString += 4;
UnicodeString += 1;
}
//
// Add tailing '\0' character
//
*UnicodeString = L'\0';
return EFI_SUCCESS;
}
/**
Convert Unicode string to binary representation Config string, e.g.
"ABCD" => "0041004200430044". Config string appears in <ConfigHdr> (i.e.
"&NAME=<string>"), or Name/Value pair in <ConfigBody> (i.e. "label=<string>").
@param ConfigString Binary representation of Unicode String, <string> := (<HexCh>4)+
@param StrBufferLen On input: Length in bytes of buffer to hold the Unicode string.
Includes tailing '\0' character.
On output:
If return EFI_SUCCESS, containing length of Unicode string buffer.
If return EFI_BUFFER_TOO_SMALL, containg length of string buffer desired.
@param UnicodeString Original Unicode string.
@retval EFI_SUCCESS Routine success.
@retval EFI_BUFFER_TOO_SMALL The string buffer is too small.
**/
EFI_STATUS
EFIAPI
UnicodeToConfigString (
IN OUT CHAR16 *ConfigString,
IN OUT UINTN *StrBufferLen,
IN CHAR16 *UnicodeString
)
{
UINTN Index;
UINTN Len;
UINTN BufferSize;
CHAR16 *String;
Len = StrLen (UnicodeString);
BufferSize = (Len * 4 + 1) * sizeof (CHAR16);
if (*StrBufferLen < BufferSize) {
*StrBufferLen = BufferSize;
return EFI_BUFFER_TOO_SMALL;
}
*StrBufferLen = BufferSize;
String = ConfigString;
for (Index = 0; Index < Len; Index++) {
BufToHexString (ConfigString, &BufferSize, (UINT8 *) UnicodeString, 2);
ConfigString += 4;
UnicodeString += 1;
}
//
// Add tailing '\0' character
//
*ConfigString = L'\0';
//
// Convert the uppercase to lowercase since <HexAf> is defined in lowercase format.
//
ToLower (String);
return EFI_SUCCESS;
}
/**
Construct <ConfigHdr> using routing information GUID/NAME/PATH.
@param ConfigHdr Pointer to the ConfigHdr string.
@param StrBufferLen On input: Length in bytes of buffer to hold the
ConfigHdr string. Includes tailing '\0' character.
On output: If return EFI_SUCCESS, containing
length of ConfigHdr string buffer. If return
EFI_BUFFER_TOO_SMALL, containg length of string
buffer desired.
@param Guid Routing information: GUID.
@param Name Routing information: NAME.
@param DriverHandle Driver handle which contains the routing
information: PATH.
@retval EFI_SUCCESS Routine success.
@retval EFI_BUFFER_TOO_SMALL The ConfigHdr string buffer is too small.
**/
EFI_STATUS
EFIAPI
ConstructConfigHdr (
IN OUT CHAR16 *ConfigHdr,
IN OUT UINTN *StrBufferLen,
IN CONST EFI_GUID *Guid,
IN CHAR16 *Name, OPTIONAL
IN EFI_HANDLE *DriverHandle
)
{
EFI_STATUS Status;
UINTN NameStrLen;
UINTN DevicePathSize;
UINTN BufferSize;
CHAR16 *StrPtr;
EFI_DEVICE_PATH_PROTOCOL *DevicePath;
if (Name == NULL) {
//
// There will be no "NAME" in <ConfigHdr> for Name/Value storage
//
NameStrLen = 0;
} else {
//
// For buffer storage
//
NameStrLen = StrLen (Name);
}
//
// Retrieve DevicePath Protocol associated with this HiiPackageList
//
Status = gBS->HandleProtocol (
DriverHandle,
&gEfiDevicePathProtocolGuid,
(VOID **) &DevicePath
);
if (EFI_ERROR (Status)) {
return Status;
}
DevicePathSize = GetDevicePathSize (DevicePath);
//
// GUID=<HexCh>32&NAME=<Char>NameStrLen&PATH=<HexChar>DevicePathStrLen <NULL>
// | 5 | 32 | 6 | NameStrLen*4 | 6 | DevicePathStrLen | 1 |
//
BufferSize = (5 + 32 + 6 + NameStrLen * 4 + 6 + DevicePathSize * 2 + 1) * sizeof (CHAR16);
if (*StrBufferLen < BufferSize) {
*StrBufferLen = BufferSize;
return EFI_BUFFER_TOO_SMALL;
}
*StrBufferLen = BufferSize;
StrPtr = ConfigHdr;
StrCpy (StrPtr, L"GUID=");
StrPtr += 5;
BufferToHexString (StrPtr, (UINT8 *) Guid, sizeof (EFI_GUID));
StrPtr += 32;
//
// Convert name string, e.g. name "ABCD" => "&NAME=0041004200430044"
//
StrCpy (StrPtr, L"&NAME=");
StrPtr += 6;
if (Name != NULL) {
BufferSize = (NameStrLen * 4 + 1) * sizeof (CHAR16);
UnicodeToConfigString (StrPtr, &BufferSize, Name);
StrPtr += (NameStrLen * 4);
}
StrCpy (StrPtr, L"&PATH=");
StrPtr += 6;
BufferToHexString (StrPtr, (UINT8 *) DevicePath, DevicePathSize);
return EFI_SUCCESS;
}
/**
Search BlockName "&OFFSET=Offset&WIDTH=Width" in a string.
@param String The string to be searched in.
@param Offset Offset in BlockName.
@param Width Width in BlockName.
@retval TRUE Block name found.
@retval FALSE Block name not found.
**/
BOOLEAN
EFIAPI
FindBlockName (
IN OUT CHAR16 *String,
IN UINTN Offset,
IN UINTN Width
)
{
EFI_STATUS Status;
UINTN Data;
UINTN BufferSize;
UINTN ConvertedStrLen;
while ((String = StrStr (String, L"&OFFSET=")) != NULL) {
//
// Skip '&OFFSET='
//
String = String + 8;
Data = 0;
BufferSize = sizeof (UINTN);
Status = HexStringToBuf ((UINT8 *) &Data, &BufferSize, String, &ConvertedStrLen);
if (EFI_ERROR (Status)) {
return FALSE;
}
String = String + ConvertedStrLen;
if (Data != Offset) {
continue;
}
if (StrnCmp (String, L"&WIDTH=", 7) != 0) {
return FALSE;
}
String = String + 7;
Data = 0;
BufferSize = sizeof (UINTN);
Status = HexStringToBuf ((UINT8 *) &Data, &BufferSize, String, &ConvertedStrLen);
if (EFI_ERROR (Status)) {
return FALSE;
}
if (Data == Width) {
return TRUE;
}
String = String + ConvertedStrLen;
}
return FALSE;
}
/**
This routine is invoked by ConfigAccess.Callback() to retrived uncommitted data from Form Browser.
@param VariableGuid An optional field to indicate the target variable
GUID name to use.
@param VariableName An optional field to indicate the target
human-readable variable name.
@param BufferSize On input: Length in bytes of buffer to hold
retrived data. On output: If return
EFI_BUFFER_TOO_SMALL, containg length of buffer
desired.
@param Buffer Buffer to hold retrived data.
@retval EFI_SUCCESS Routine success.
@retval EFI_BUFFER_TOO_SMALL The intput buffer is too small.
@retval EFI_OUT_OF_RESOURCES There is no enough available memory space.
**/
EFI_STATUS
EFIAPI
GetBrowserData (
IN CONST EFI_GUID *VariableGuid, OPTIONAL
IN CONST CHAR16 *VariableName, OPTIONAL
IN OUT UINTN *BufferSize,
IN OUT UINT8 *Buffer
)
{
EFI_STATUS Status;
CONST CHAR16 *ConfigHdr;
CHAR16 *ConfigResp;
CHAR16 *StringPtr;
UINTN HeaderLen;
UINTN BufferLen;
CHAR16 *Progress;
//
// Locate protocols for use
//
Status = LocateFormBrowser2Protocols ();
if (EFI_ERROR (Status)) {
return Status;
}
//
// Retrive formset storage data from Form Browser
//
ConfigHdr = mFakeConfigHdr;
HeaderLen = StrLen (ConfigHdr);
//
// First try allocate 0x4000 buffer for the formet storage data.
//
BufferLen = 0x4000;
ConfigResp = AllocateZeroPool (BufferLen + HeaderLen);
if (ConfigResp == NULL) {
BufferLen = 0;
}
StringPtr = ConfigResp + HeaderLen;
*StringPtr = L'&';
StringPtr++;
Status = mFormBrowser2->BrowserCallback (
mFormBrowser2,
&BufferLen,
StringPtr,
TRUE,
VariableGuid,
VariableName
);
if (Status == EFI_BUFFER_TOO_SMALL) {
if (ConfigResp != NULL) {
FreePool (ConfigResp);
}
ConfigResp = AllocateZeroPool (BufferLen + HeaderLen);
if (ConfigResp == NULL) {
return EFI_OUT_OF_RESOURCES;
}
StringPtr = ConfigResp + HeaderLen;
*StringPtr = L'&';
StringPtr++;
Status = mFormBrowser2->BrowserCallback (
mFormBrowser2,
&BufferLen,
StringPtr,
TRUE,
VariableGuid,
VariableName
);
}
if (EFI_ERROR (Status)) {
FreePool (ConfigResp);
return Status;
}
CopyMem (ConfigResp, ConfigHdr, HeaderLen * sizeof (UINT16));
//
// Convert <ConfigResp> to buffer data
//
Status = mHiiConfigRouting->ConfigToBlock (
mHiiConfigRouting,
ConfigResp,
Buffer,
BufferSize,
&Progress
);
FreePool (ConfigResp);
return Status;
}
/**
This routine is invoked by ConfigAccess.Callback() to update uncommitted data of Form Browser.
@param VariableGuid An optional field to indicate the target variable
GUID name to use.
@param VariableName An optional field to indicate the target
human-readable variable name.
@param BufferSize Length in bytes of buffer to hold retrived data.
@param Buffer Buffer to hold retrived data.
@param RequestElement An optional field to specify which part of the
buffer data will be send back to Browser. If NULL,
the whole buffer of data will be committed to
Browser. <RequestElement> ::=
&OFFSET=<Number>&WIDTH=<Number>*
@retval EFI_SUCCESS Routine success.
@retval EFI_OUT_OF_RESOURCES There is no enough available memory space.
@retval Other Updating Browser uncommitted data failed.
**/
EFI_STATUS
EFIAPI
SetBrowserData (
IN CONST EFI_GUID *VariableGuid, OPTIONAL
IN CONST CHAR16 *VariableName, OPTIONAL
IN UINTN BufferSize,
IN CONST UINT8 *Buffer,
IN CONST CHAR16 *RequestElement OPTIONAL
)
{
EFI_STATUS Status;
CONST CHAR16 *ConfigHdr;
CHAR16 *ConfigResp;
CHAR16 *StringPtr;
UINTN HeaderLen;
UINTN BufferLen;
CHAR16 *Progress;
CHAR16 BlockName[33];
CHAR16 *ConfigRequest;
CONST CHAR16 *Request;
//
// Locate protocols for use
//
Status = LocateFormBrowser2Protocols ();
if (EFI_ERROR (Status)) {
return Status;
}
//
// Prepare <ConfigRequest>
//
ConfigHdr = mFakeConfigHdr;
HeaderLen = StrLen (ConfigHdr);
if (RequestElement == NULL) {
//
// RequestElement not specified, use "&OFFSET=0&WIDTH=<BufferSize>" as <BlockName>
//
BlockName[0] = L'\0';
StrCpy (BlockName, L"&OFFSET=0&WIDTH=");
//
// String lenghth of L"&OFFSET=0&WIDTH=" is 16
//
StringPtr = BlockName + 16;
BufferLen = sizeof (BlockName) - (16 * sizeof (CHAR16));
BufToHexString (StringPtr, &BufferLen, (UINT8 *) &BufferSize, sizeof (UINTN));
Request = BlockName;
} else {
Request = RequestElement;
}
BufferLen = HeaderLen * sizeof (CHAR16) + StrSize (Request);
ConfigRequest = AllocateZeroPool (BufferLen);
if (ConfigRequest == NULL) {
return EFI_OUT_OF_RESOURCES;
}
CopyMem (ConfigRequest, ConfigHdr, HeaderLen * sizeof (CHAR16));
StringPtr = ConfigRequest + HeaderLen;
StrCpy (StringPtr, Request);
//
// Convert buffer to <ConfigResp>
//
Status = mHiiConfigRouting->BlockToConfig (
mHiiConfigRouting,
ConfigRequest,
Buffer,
BufferSize,
&ConfigResp,
&Progress
);
if (EFI_ERROR (Status)) {
FreePool (ConfigRequest);
return Status;
}
//
// Skip <ConfigHdr> and '&'
//
StringPtr = ConfigResp + HeaderLen + 1;
//
// Change uncommitted data in Browser
//
Status = mFormBrowser2->BrowserCallback (
mFormBrowser2,
&BufferSize,
StringPtr,
FALSE,
NULL,
NULL
);
FreePool (ConfigRequest);
return Status;
}
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