sravan/system76-edk2
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity
Files
4354ec05faa3aa88a8064c0ff4d03fc03b15e70d
system76-edk2/MdeModulePkg/Library/UefiIfrSupportLib/UefiIfrForm.c
vanjeff 7174e04c2b 1.enhanced security check. 
2.remove un-necessary ASSERT.

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@7522 6f19259b-4bc3-4df7-8a09-765794883524
2009-02-13 06:39:44 +00:00

1655 lines
50 KiB
C
Raw Blame History

/** @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"
CONST EFI_FORM_BROWSER2_PROTOCOL *mFormBrowser2 = NULL;
CONST EFI_HII_CONFIG_ROUTING_PROTOCOL *mIfrSupportLibHiiConfigRouting = NULL;
GLOBAL_REMOVE_IF_UNREFERENCED CONST CHAR8 mIfrSupportLibHexStr[] = {'0','1','2','3','4','5','6','7','8','9','A','B','C','D','E','F'};
//
// Fake <ConfigHdr>
//
GLOBAL_REMOVE_IF_UNREFERENCED CONST UINT16 mFakeConfigHdr[] = L"GUID=00000000000000000000000000000000&NAME=0000&PATH=0";
/**
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 (mIfrSupportLibHiiConfigRouting == NULL) {
Status = gBS->LocateProtocol (&gEfiHiiConfigRoutingProtocolGuid, NULL, (VOID **) &mIfrSupportLibHiiConfigRouting);
if (EFI_ERROR (Status)) {
return Status;
}
}
return EFI_SUCCESS;
}
/**
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 The first String to be displayed in the Pop-Up.
@param Marker 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 CHAR16 *String,
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;
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, String);
Status = IfrLibCreatePopUp2 (NumberOfLines, KeyValue, String, Marker);
VA_END (Marker);
return Status;
}
/**
Extract block name from the array generated by VFR compiler. The name of
this array is "Vfr + <StorageName> + BlockName", e.g. "VfrMyIfrNVDataBlockName".
Format of this array is:
Array length | 4-bytes
Offset | 2-bytes
Width | 2-bytes
Offset | 2-bytes
Width | 2-bytes
... ...
@param Buffer Array generated by VFR compiler.
@param BlockName The returned <BlockName>
@retval EFI_OUT_OF_RESOURCES Run out of memory resource.
@retval EFI_INVALID_PARAMETER Buffer is NULL or BlockName is NULL.
@retval EFI_SUCCESS Operation successful.
**/
EFI_STATUS
ExtractBlockName (
IN UINT8 *Buffer,
OUT CHAR16 **BlockName
)
{
UINTN Index;
UINT32 Length;
UINT32 BlockNameNumber;
UINTN HexStringBufferLen;
CHAR16 *StringPtr;
if ((Buffer == NULL) || (BlockName == NULL)) {
return EFI_INVALID_PARAMETER;
}
//
// Calculate number of Offset/Width pair
//
CopyMem (&Length, Buffer, sizeof (UINT32));
BlockNameNumber = (Length - sizeof (UINT32)) / (sizeof (UINT16) * 2);
//
// <BlockName> ::= &OFFSET=1234&WIDTH=1234
// | 8 | 4 | 7 | 4 |
//
StringPtr = AllocateZeroPool ((BlockNameNumber * (8 + 4 + 7 + 4) + 1) * sizeof (CHAR16));
if (StringPtr == NULL) {
return EFI_OUT_OF_RESOURCES;
}
*BlockName = StringPtr;
Buffer += sizeof (UINT32);
for (Index = 0; Index < BlockNameNumber; Index++) {
StrCpy (StringPtr, L"&OFFSET=");
StringPtr += 8;
HexStringBufferLen = 5;
BufToHexString (StringPtr, &HexStringBufferLen, Buffer, sizeof (UINT16));
Buffer += sizeof (UINT16);
StringPtr += 4;
StrCpy (StringPtr, L"&WIDTH=");
StringPtr += 7;
HexStringBufferLen = 5;
BufToHexString (StringPtr, &HexStringBufferLen, Buffer, sizeof (UINT16));
Buffer += sizeof (UINT16);
StringPtr += 4;
}
return EFI_SUCCESS;
}
/**
Extract block config from the array generated by VFR compiler. The name of
this array is "Vfr + <StorageName> + Default<HexCh>4", e.g. "VfrMyIfrNVDataDefault0000".
@param Buffer - Array generated by VFR compiler.
@param BlockConfig - The returned <BlockConfig>
@retval EFI_OUT_OF_RESOURCES - Run out of memory resource.
@retval EFI_INVALID_PARAMETER - Buffer is NULL or BlockConfig is NULL.
@retval EFI_SUCCESS - Operation successful.
**/
EFI_STATUS
ExtractBlockConfig (
IN UINT8 *Buffer,
OUT CHAR16 **BlockConfig
)
{
UINT32 Length;
UINT16 Width;
UINTN HexStringBufferLen;
CHAR16 *StringPtr;
UINT8 *BufferEnd;
CHAR16 *StringEnd;
EFI_STATUS Status;
if ((Buffer == NULL) || (BlockConfig == NULL)) {
return EFI_INVALID_PARAMETER;
}
//
// Calculate length of AltResp string
// Format of Default value array is:
// Array length | 4-bytes
// Offset | 2-bytes
// Width | 2-bytes
// Value | Variable length
// Offset | 2-bytes
// Width | 2-bytes
// Value | Variable length
// ... ...
// When value is 1 byte in length, overhead of AltResp string will be maximum,
// BlockConfig ::= <&OFFSET=1234&WIDTH=1234&VALUE=12>+
// | 8 | 4 | 7 | 4 | 7 |2|
// so the maximum length of BlockConfig could be calculated as:
// (ArrayLength / 5) * (8 + 4 + 7 + 4 + 7 + 2) = ArrayLength * 6.4 < ArrayLength * 7
//
CopyMem (&Length, Buffer, sizeof (UINT32));
BufferEnd = Buffer + Length;
StringPtr = AllocatePool (Length * 7 * sizeof (CHAR16));
*BlockConfig = StringPtr;
if (StringPtr == NULL) {
return EFI_OUT_OF_RESOURCES;
}
StringEnd = StringPtr + (Length * 7);
Buffer += sizeof (UINT32);
while (Buffer < BufferEnd) {
StrCpy (StringPtr, L"&OFFSET=");
StringPtr += 8;
HexStringBufferLen = 5;
BufToHexString (StringPtr, &HexStringBufferLen, Buffer, sizeof (UINT16));
Buffer += sizeof (UINT16);
StringPtr += 4;
StrCpy (StringPtr, L"&WIDTH=");
StringPtr += 7;
HexStringBufferLen = 5;
BufToHexString (StringPtr, &HexStringBufferLen, Buffer, sizeof (UINT16));
CopyMem (&Width, Buffer, sizeof (UINT16));
Buffer += sizeof (UINT16);
StringPtr += 4;
StrCpy (StringPtr, L"&VALUE=");
StringPtr += 7;
HexStringBufferLen = StringEnd - StringPtr;
Status = BufToHexString (StringPtr, &HexStringBufferLen, Buffer, Width);
if (EFI_ERROR (Status)) {
return Status;
}
Buffer += Width;
StringPtr += (Width * 2);
}
return EFI_SUCCESS;
}
/**
Construct <ConfigAltResp> for a buffer storage.
@param ConfigRequest The Config request string. If set to NULL, all the
configurable elements will be extracted from BlockNameArray.
@param ConfigAltResp The returned <ConfigAltResp>.
@param Progress On return, points to a character in the Request.
@param Guid GUID of the buffer storage.
@param Name Name of the buffer storage.
@param DriverHandle The DriverHandle which is used to invoke HiiDatabase
protocol interface NewPackageList().
@param BufferStorage Content of the buffer storage.
@param BufferStorageSize Length in bytes of the buffer storage.
@param BlockNameArray Array generated by VFR compiler.
@param NumberAltCfg Number of Default value array generated by VFR compiler.
The sequential input parameters will be number of
AltCfgId and DefaultValueArray pairs. When set to 0,
there will be no <AltResp>.
retval EFI_OUT_OF_RESOURCES Run out of memory resource.
retval EFI_INVALID_PARAMETER ConfigAltResp is NULL.
retval EFI_SUCCESS Operation successful.
**/
EFI_STATUS
ConstructConfigAltResp (
IN EFI_STRING ConfigRequest, OPTIONAL
OUT EFI_STRING *Progress,
OUT EFI_STRING *ConfigAltResp,
IN EFI_GUID *Guid,
IN CHAR16 *Name,
IN EFI_HANDLE *DriverHandle,
IN VOID *BufferStorage,
IN UINTN BufferStorageSize,
IN VOID *BlockNameArray, OPTIONAL
IN UINTN NumberAltCfg,
...
//IN UINT16 AltCfgId,
//IN VOID *DefaultValueArray,
)
{
EFI_STATUS Status;
CHAR16 *ConfigHdr;
CHAR16 *BlockName;
CHAR16 *DescHdr;
CHAR16 *StringPtr;
CHAR16 **AltCfg;
UINT16 AltCfgId;
VOID *DefaultValueArray;
UINTN StrBufferLen;
EFI_STRING ConfigResp;
EFI_STRING TempStr;
VA_LIST Args;
UINTN AltRespLen;
UINTN Index;
BOOLEAN NeedFreeConfigRequest;
EFI_HII_CONFIG_ROUTING_PROTOCOL *HiiConfigRouting;
UINTN Len;
if (ConfigAltResp == NULL) {
return EFI_INVALID_PARAMETER;
}
DescHdr = NULL;
StringPtr = NULL;
AltCfg = NULL;
ConfigResp = NULL;
BlockName = NULL;
NeedFreeConfigRequest = FALSE;
//
// Construct <ConfigHdr> : "GUID=...&NAME=...&PATH=..."
//
ConfigHdr = NULL;
StrBufferLen = 0;
Status = ConstructConfigHdr (
ConfigHdr,
&StrBufferLen,
Guid,
Name,
DriverHandle
);
ASSERT (Status == EFI_BUFFER_TOO_SMALL);
ConfigHdr = AllocateZeroPool (StrBufferLen);
if (ConfigHdr == NULL) {
Status = EFI_OUT_OF_RESOURCES;
goto Exit;
}
Status = ConstructConfigHdr (
ConfigHdr,
&StrBufferLen,
Guid,
Name,
DriverHandle
);
if (EFI_ERROR (Status)) {
goto Exit;
}
//
// Construct <ConfigResp>
//
if (ConfigRequest == NULL) {
//
// If ConfigRequest is set to NULL, export all configurable elements in BlockNameArray
//
Status = ExtractBlockName (BlockNameArray, &BlockName);
if (EFI_ERROR (Status)) {
goto Exit;
}
Len = StrSize (ConfigHdr);
ConfigRequest = AllocateZeroPool (Len + StrSize (BlockName) - sizeof (CHAR16));
if (ConfigRequest == NULL) {
Status = EFI_OUT_OF_RESOURCES;
goto Exit;
}
StrCpy (ConfigRequest, ConfigHdr);
StrCat (ConfigRequest, BlockName);
NeedFreeConfigRequest = TRUE;
}
Status = gBS->LocateProtocol (&gEfiHiiConfigRoutingProtocolGuid, NULL, (VOID **) &HiiConfigRouting);
if (EFI_ERROR (Status)) {
return Status;
}
Status = HiiConfigRouting->BlockToConfig (
HiiConfigRouting,
ConfigRequest,
BufferStorage,
BufferStorageSize,
&ConfigResp,
(Progress == NULL) ? &TempStr : Progress
);
if (EFI_ERROR (Status)) {
return Status;
}
AltRespLen = 0;
//
// Construct <AltResp>
//
if (NumberAltCfg > 0) {
DescHdr = AllocateZeroPool (NumberAltCfg * 16 * sizeof (CHAR16));
if (DescHdr == NULL) {
Status = EFI_OUT_OF_RESOURCES;
goto Exit;
}
StringPtr = DescHdr;
AltCfg = AllocateZeroPool (NumberAltCfg * sizeof (CHAR16 *));
if (AltCfg == NULL) {
Status = EFI_OUT_OF_RESOURCES;
goto Exit;
}
VA_START (Args, NumberAltCfg);
for (Index = 0; Index < NumberAltCfg; Index++) {
AltCfgId = (UINT16) VA_ARG (Args, UINT16);
DefaultValueArray = (UINT8 *) VA_ARG (Args, VOID *);
//
// '&' <ConfigHdr>
//
AltRespLen += (StrLen (ConfigHdr) + 1);
StringPtr = DescHdr + Index * 16;
StrCpy (StringPtr, L"&ALTCFG=");
AltRespLen += (8 + sizeof (UINT16) * 2);
StrBufferLen = 5;
BufToHexString (StringPtr + 8, &StrBufferLen, (UINT8 *) &AltCfgId, sizeof (UINT16));
Status = ExtractBlockConfig (DefaultValueArray, &AltCfg[Index]);
if (EFI_ERROR (Status)) {
goto Exit;
}
AltRespLen += StrLen (AltCfg[Index]);
}
VA_END (Args);
}
//
// Generate the final <ConfigAltResp>
//
StrBufferLen = (StrLen ((CHAR16 *) ConfigResp) + AltRespLen + 1) * sizeof (CHAR16);
TempStr = AllocateZeroPool (StrBufferLen);
*ConfigAltResp = TempStr;
if (TempStr == NULL) {
goto Exit;
}
//
// <ConfigAltResp> ::= <ConfigResp> ['&' <AltResp>]*
//
StrCpy (TempStr, ConfigResp);
for (Index = 0; Index < NumberAltCfg; Index++) {
StrCat (TempStr, L"&");
StrCat (TempStr, ConfigHdr);
StrCat (TempStr, DescHdr + Index * 16);
StrCat (TempStr, AltCfg[Index]);
FreePool (AltCfg[Index]);
}
Exit:
if (NeedFreeConfigRequest) {
FreePool (ConfigRequest);
}
FreePool (ConfigHdr);
if (ConfigResp != NULL) {
FreePool (ConfigResp);
}
if (BlockName != NULL) {
FreePool (BlockName);
}
if (NumberAltCfg > 0) {
FreePool (DescHdr);
FreePool (AltCfg);
}
return EFI_SUCCESS;
}
/**
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
BufInReverseOrderToHexString (
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.
@retval RETURN_BUFFER_TOO_SMALL The input BufferSize is too small to hold the output. BufferSize
will be updated to the size required for the converstion.
**/
EFI_STATUS
EFIAPI
HexStringToBufInReverseOrder (
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 + 1) / 2);
}
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 Operation completes successfully.
@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 Operation completes successfully.
@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 Operation completes successfully.
@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;
//
// Make sure when ConfigHdr is NULL, StrBufferlen must be 0
//
ASSERT (!(ConfigHdr == NULL && *StrBufferLen != 0));
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 == 0) || *StrBufferLen < BufferSize) {
*StrBufferLen = BufferSize;
return EFI_BUFFER_TOO_SMALL;
}
*StrBufferLen = BufferSize;
StrPtr = ConfigHdr;
StrCpy (StrPtr, L"GUID=");
StrPtr += 5;
BufInReverseOrderToHexString (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;
BufInReverseOrderToHexString (StrPtr, (UINT8 *) DevicePath, DevicePathSize);
return EFI_SUCCESS;
}
/**
Determines if the Routing data (Guid and Name) is correct in <ConfigHdr>.
@param ConfigString Either <ConfigRequest> or <ConfigResp>.
@param StorageGuid GUID of the storage.
@param StorageName Name of the stoarge.
@retval TRUE Routing information is correct in ConfigString.
@retval FALSE Routing information is incorrect in ConfigString.
**/
BOOLEAN
IsConfigHdrMatch (
IN EFI_STRING ConfigString,
IN EFI_GUID *StorageGuid, OPTIONAL
IN CHAR16 *StorageName OPTIONAL
)
{
EFI_STATUS Status;
BOOLEAN Match;
EFI_GUID Guid;
CHAR16 *Name;
CHAR16 *StrPtr;
UINTN BufferSize;
//
// <ConfigHdr> ::=
// GUID=<HexCh>32&NAME=<Char>NameStrLen&PATH=<HexChar>DevicePathStrLen <NULL>
// | 5 | 32 | 6 | NameStrLen*4 | 6 | DevicePathStrLen | 1 |
//
if (StrLen (ConfigString) <= (5 + 32 + 6)) {
return FALSE;
}
//
// Compare GUID
//
if (StorageGuid != NULL) {
StrPtr = ConfigString + 5 + 32;
if (*StrPtr != L'&') {
return FALSE;
}
*StrPtr = L'\0';
BufferSize = sizeof (EFI_GUID);
Status = HexStringToBufInReverseOrder (
(UINT8 *) &Guid,
&BufferSize,
ConfigString + 5
);
*StrPtr = L'&';
if (EFI_ERROR (Status)) {
return FALSE;
}
if (!CompareGuid (&Guid, StorageGuid)) {
return FALSE;
}
}
//
// Compare Name
//
Match = TRUE;
if (StorageName != NULL) {
StrPtr = ConfigString + 5 + 32 + 6;
while (*StrPtr != L'\0' && *StrPtr != L'&') {
StrPtr++;
}
if (*StrPtr != L'&') {
return FALSE;
}
*StrPtr = L'\0';
BufferSize = (((UINTN) StrPtr) - ((UINTN) &ConfigString[5 + 32 + 6])) / 4 + sizeof (CHAR16);
Name = AllocatePool (BufferSize);
ASSERT (Name != NULL);
Status = ConfigStringToUnicode (
Name,
&BufferSize,
ConfigString + 5 + 32 + 6
);
*StrPtr = L'&';
if (EFI_ERROR (Status) || (StrCmp (Name, StorageName) != 0)) {
Match = FALSE;
}
FreePool (Name);
}
return Match;
}
/**
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 Operation completes successfully.
@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) {
return EFI_OUT_OF_RESOURCES;
}
StringPtr = ConfigResp + HeaderLen;
*StringPtr = L'&';
StringPtr++;
Status = mFormBrowser2->BrowserCallback (
mFormBrowser2,
&BufferLen,
StringPtr,
TRUE,
VariableGuid,
VariableName
);
if (Status == EFI_BUFFER_TOO_SMALL) {
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 = mIfrSupportLibHiiConfigRouting->ConfigToBlock (
mIfrSupportLibHiiConfigRouting,
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 Operation completes successfully.
@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 = mIfrSupportLibHiiConfigRouting->BlockToConfig (
mIfrSupportLibHiiConfigRouting,
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,
VariableGuid,
VariableName
);
FreePool (ConfigRequest);
return Status;
}
/**
Test if a Unicode character is a hexadecimal digit. If true, the input
Unicode character is converted to a byte.
This function tests if a Unicode character is a hexadecimal digit. If true, the input
Unicode character is converted to a byte. For example, Unicode character
L'A' will be converted to 0x0A.
If Digit is NULL, then ASSERT.
@param Digit The output hexadecimal digit.
@param Char The input Unicode character.
@retval TRUE Char is in the range of Hexadecimal number. Digit is updated
to the byte value of the number.
@retval FALSE Char is not in the range of Hexadecimal number. Digit is keep
intact.
**/
BOOLEAN
EFIAPI
IsHexDigit (
OUT UINT8 *Digit,
IN CHAR16 Char
)
{
ASSERT (Digit != NULL);
if ((Char >= L'0') && (Char <= L'9')) {
*Digit = (UINT8) (Char - L'0');
return TRUE;
}
if ((Char >= L'A') && (Char <= L'F')) {
*Digit = (UINT8) (Char - L'A' + 0x0A);
return TRUE;
}
if ((Char >= L'a') && (Char <= L'f')) {
*Digit = (UINT8) (Char - L'a' + 0x0A);
return TRUE;
}
return FALSE;
}
/**
Convert binary buffer to a Unicode String in a specified sequence.
This function converts bytes in the memory block pointed by Buffer to a Unicode String Str.
Each byte will be represented by two Unicode characters. For example, byte 0xA1 will
be converted into two Unicode character L'A' and L'1'. In the output String, the Unicode Character
for the Most Significant Nibble will be put before the Unicode Character for the Least Significant
Nibble. The output string for the buffer containing a single byte 0xA1 will be L"A1".
For a buffer with multiple bytes, the Unicode character produced by the first byte will be put into the
the last character in the output string. The one next to first byte will be put into the
character before the last character. This rules applies to the rest of the bytes. The Unicode
character by the last byte will be put into the first character in the output string. For example,
the input buffer for a 64-bits unsigned integer 0x12345678abcdef1234 will be converted to
a Unicode string equal to L"12345678abcdef1234".
@param String On input, String is pointed to the buffer allocated for the convertion.
@param StringLen The Length of String buffer to hold the output String. The length must include the tailing '\0' character.
The StringLen required to convert a N bytes Buffer will be a least equal to or greater
than 2*N + 1.
@param Buffer The pointer to a input buffer.
@param BufferSizeInBytes Length in bytes of the input buffer.
@retval EFI_SUCCESS The convertion is successful. All bytes in Buffer has been convert to the corresponding
Unicode character and placed into the right place in String.
@retval EFI_BUFFER_TOO_SMALL StringSizeInBytes is smaller than 2 * N + 1the number of bytes required to
complete the convertion.
**/
RETURN_STATUS
EFIAPI
BufToHexString (
IN OUT CHAR16 *String,
IN OUT UINTN *StringLen,
IN CONST UINT8 *Buffer,
IN UINTN BufferSizeInBytes
)
{
UINTN Idx;
UINT8 Byte;
UINTN StrLen;
//
// Make sure string is either passed or allocate enough.
// It takes 2 Unicode characters (4 bytes) to represent 1 byte of the binary buffer.
// Plus the Unicode termination character.
//
StrLen = BufferSizeInBytes * 2;
if (StrLen > ((*StringLen) - 1)) {
*StringLen = StrLen + 1;
return RETURN_BUFFER_TOO_SMALL;
}
*StringLen = StrLen + 1;
//
// Ends the string.
//
String[StrLen] = L'\0';
for (Idx = 0; Idx < BufferSizeInBytes; Idx++) {
Byte = Buffer[Idx];
String[StrLen - 1 - Idx * 2] = mIfrSupportLibHexStr [Byte & 0xF];
String[StrLen - 2 - Idx * 2] = mIfrSupportLibHexStr [Byte >> 4];
}
return RETURN_SUCCESS;
}
/**
Convert a Unicode string consisting of hexadecimal characters to a output byte buffer.
This function converts a Unicode string consisting of characters in the range of Hexadecimal
character (L'0' to L'9', L'A' to L'F' and L'a' to L'f') to a output byte buffer. The function will stop
at the first non-hexadecimal character or the NULL character. The convertion process can be
simply viewed as the reverse operations defined by BufToHexString. Two Unicode characters will be
converted into one byte. The first Unicode character represents the Most Significant Nibble and the
second Unicode character represents the Least Significant Nibble in the output byte.
The first pair of Unicode characters represents the last byte in the output buffer. The second pair of Unicode
characters represent the the byte preceding the last byte. This rule applies to the rest pairs of bytes.
The last pair represent the first byte in the output buffer.
For example, a Unciode String L"12345678" will be converted into a buffer wil the following bytes
(first byte is the byte in the lowest memory address): "0x78, 0x56, 0x34, 0x12".
If String has N valid hexadecimal characters for conversion, the caller must make sure Buffer is at least
N/2 (if N is even) or (N+1)/2 (if N if odd) bytes.
If either Buffer, BufferSizeInBytes or String is NULL, then ASSERT ().
@param Buffer The output buffer allocated by the caller.
@param BufferSizeInBytes On input, the size in bytes of Buffer. On output, it is updated to
contain the size of the Buffer which is actually used for the converstion.
For Unicode string with 2*N hexadecimal characters (not including the
tailing NULL character), N bytes of Buffer will be used for the output.
@param String The input hexadecimal string.
@param ConvertedStrLen The number of hexadecimal characters used to produce content in output
buffer Buffer.
@retval RETURN_BUFFER_TOO_SMALL The input BufferSizeInBytes is too small to hold the output. BufferSizeInBytes
will be updated to the size required for the converstion.
@retval RETURN_SUCCESS The convertion is successful or the first Unicode character from String
is hexadecimal. If ConvertedStrLen is not NULL, it is updated
to the number of hexadecimal character used for the converstion.
**/
RETURN_STATUS
EFIAPI
HexStringToBuf (
OUT UINT8 *Buffer,
IN OUT UINTN *BufferSizeInBytes,
IN CONST CHAR16 *String,
OUT UINTN *ConvertedStrLen OPTIONAL
)
{
UINTN HexCnt;
UINTN Idx;
UINTN BufferLength;
UINT8 Digit;
UINT8 Byte;
ASSERT (Buffer != NULL);
ASSERT (BufferSizeInBytes != NULL);
ASSERT (String != NULL);
//
// Find out how many hex characters the string has.
//
for (Idx = 0, HexCnt = 0; IsHexDigit (&Digit, String[Idx]); Idx++, HexCnt++);
if (HexCnt == 0) {
*ConvertedStrLen = 0;
return RETURN_SUCCESS;
}
//
// Two Unicode characters make up 1 buffer byte. Round up.
//
BufferLength = (HexCnt + 1) / 2;
//
// Test if buffer is passed enough.
//
if (BufferLength > (*BufferSizeInBytes)) {
*BufferSizeInBytes = BufferLength;
return RETURN_BUFFER_TOO_SMALL;
}
*BufferSizeInBytes = BufferLength;
for (Idx = 0; Idx < HexCnt; Idx++) {
IsHexDigit (&Digit, String[HexCnt - 1 - Idx]);
//
// For odd charaters, write the lower nibble for each buffer byte,
// and for even characters, the upper nibble.
//
if ((Idx & 1) == 0) {
Byte = Digit;
} else {
Byte = Buffer[Idx / 2];
Byte &= 0x0F;
Byte = (UINT8) (Byte | Digit << 4);
}
Buffer[Idx / 2] = Byte;
}
if (ConvertedStrLen != NULL) {
*ConvertedStrLen = HexCnt;
}
return RETURN_SUCCESS;
}
Reference in New Issue View Git Blame Copy Permalink