/**
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.
**/
UINTN
EFIAPI
GlueGetDevicePathSize (
IN CONST EFI_DEVICE_PATH_PROTOCOL *DevicePath
)
{
CONST EFI_DEVICE_PATH_PROTOCOL *Start;
if (DevicePath == NULL) {
return 0;
}
//
// Search for the end of the device path structure
//
Start = DevicePath;
while (!EfiIsDevicePathEnd (DevicePath)) {
DevicePath = EfiNextDevicePathNode (DevicePath);
}
//
// Compute the size and add back in the size of the end device path structure
//
return ((UINTN) DevicePath - (UINTN) Start) + sizeof (EFI_DEVICE_PATH_PROTOCOL);
}
//
// get node count
//
UINTN DevPathGetNodeCount(EFI_DEVICE_PATH_PROTOCOL* devicePath)
{
if(!devicePath)
return 0;
UINTN retValue = 0;
for(; !EfiIsDevicePathEnd(devicePath); retValue += 1)
devicePath = EfiNextDevicePathNode(devicePath);
return retValue;
}
//
// get node
//
EFI_DEVICE_PATH_PROTOCOL* DevPathGetNode(EFI_DEVICE_PATH_PROTOCOL* devicePath, UINT8 type, UINT8 subType)
{
while(!EfiIsDevicePathEnd(devicePath))
{
if(EfiDevicePathType(devicePath) == type && devicePath->SubType == subType)
return devicePath;
devicePath = EfiNextDevicePathNode(devicePath);
}
return nullptr;
}
//
// check net
//
BOOLEAN DevPathHasMacAddressNode(EFI_DEVICE_PATH_PROTOCOL* devicePath)
{
while(!EfiIsDevicePathEnd(devicePath))
{
if(EfiDevicePathType(devicePath) == MESSAGING_DEVICE_PATH && devicePath->SubType == MSG_MAC_ADDR_DP)
return TRUE;
devicePath = EfiNextDevicePathNode(devicePath);
}
return FALSE;
}
//
// get device path size
//
UINTN DevPathGetSize(EFI_DEVICE_PATH_PROTOCOL* devicePath)
{
if(!devicePath)
return 0;
EFI_DEVICE_PATH_PROTOCOL* start = devicePath;
while(!EfiIsDevicePathEnd(devicePath))
devicePath = EfiNextDevicePathNode(devicePath);
return ArchConvertPointerToAddress(devicePath) - ArchConvertPointerToAddress(start) + sizeof (EFI_DEVICE_PATH_PROTOCOL);
}
//
// get partition number
//
UINT32 DevPathGetPartitionNumber(EFI_DEVICE_PATH_PROTOCOL* devicePath)
{
while(!EfiIsDevicePathEnd(devicePath))
{
if(EfiDevicePathType(devicePath) == MEDIA_DEVICE_PATH && devicePath->SubType == MEDIA_HARDDRIVE_DP)
{
HARDDRIVE_DEVICE_PATH* hardDriveDevicePath = _CR(devicePath, HARDDRIVE_DEVICE_PATH, Header);
if(hardDriveDevicePath->SignatureType == SIGNATURE_TYPE_GUID && hardDriveDevicePath->MBRType == MBR_TYPE_EFI_PARTITION_TABLE_HEADER)
return hardDriveDevicePath->PartitionNumber;
}
devicePath = EfiNextDevicePathNode(devicePath);
}
return static_cast<UINT32>(-1);
}
std::string getCanonicalEfiDevicePath(const CFDataRef& data) {
std::string path;
// Iterate through the EFI_DEVICE_PATH_PROTOCOL stacked structs.
auto bytes = CFDataGetBytePtr((CFDataRef)data);
size_t length = CFDataGetLength((CFDataRef)data);
size_t search_offset = 0;
while ((search_offset + sizeof(EFI_DEVICE_PATH_PROTOCOL)) < length) {
auto node = (const EFI_DEVICE_PATH_PROTOCOL*)(bytes + search_offset);
if (EfiIsDevicePathEnd(node)) {
// End of the EFI device path stacked structs.
break;
}
if (EfiDevicePathNodeLength(node) + search_offset > length) {
// Malformed EFI device header.
break;
}
// Only support paths and hard drive partitions.
if (EfiDevicePathType(node) == MEDIA_DEVICE_PATH) {
if (node->SubType == MEDIA_FILEPATH_DP) {
for (int i = 0; i < EfiDevicePathNodeLength(node); i += 2) {
// Strip UTF16 characters to UTF8.
path += (((char*)(node)) + sizeof(EFI_DEVICE_PATH_PROTOCOL))[i];
}
} else if (node->SubType == MEDIA_HARDDRIVE_DP) {
// Extract the device UUID to later join with block devices.
auto uuid = ((const HARDDRIVE_DEVICE_PATH*)node)->Signature;
boost::uuids::uuid hdd_signature = {{
uuid[3], uuid[2], uuid[1], uuid[0],
uuid[5], uuid[4],
uuid[7], uuid[6],
uuid[8], uuid[9],
uuid[10], uuid[11], uuid[12], uuid[13], uuid[14], uuid[15],
}};
path += boost::to_upper_copy(boost::uuids::to_string(hdd_signature));
}
}
search_offset += EfiDevicePathNodeLength(node);
}
return path;
}
//
// get partition handle by number
//
EFI_HANDLE DevPathGetPartitionHandleByNumber(EFI_DEVICE_PATH_PROTOCOL* referencePath, UINT32 number)
{
UINTN nodeCount = DevPathGetNodeCount(referencePath);
if(!nodeCount)
return nullptr;
UINTN count = 0;
EFI_HANDLE* handleArray = nullptr;
if(EFI_ERROR(EfiBootServices->LocateHandleBuffer(ByProtocol, &EfiBlockIoProtocolGuid, nullptr, &count, &handleArray)))
return nullptr;
EFI_HANDLE retValue = nullptr;
for(UINTN i = 0; i < count; i ++)
{
EFI_HANDLE theHandle = handleArray[i];
if(!theHandle)
continue;
EFI_DEVICE_PATH_PROTOCOL* devicePath = DevPathGetDevicePathProtocol(theHandle);
if(!devicePath)
continue;
if(DevPathGetNodeCount(devicePath) != nodeCount)
continue;
EFI_DEVICE_PATH_PROTOCOL* pathA = referencePath;
EFI_DEVICE_PATH_PROTOCOL* pathB = devicePath;
BOOLEAN checkResult = TRUE;
for(UINTN i = 0; i < nodeCount && !EfiIsDevicePathEnd(pathA) && !EfiIsDevicePathEnd(pathB); i ++)
{
if(EfiDevicePathNodeLength(pathA) != EfiDevicePathNodeLength(pathB))
{
checkResult = FALSE;
break;
}
#if 0
if(pathA->Type == MESSAGING_DEVICE_PATH && pathA->SubType == MSG_VENDOR_DP && !memcmp(pathA + 1, &EfiDevicePathMessagingSASGuid, sizeof(EFI_GUID)))
{
SAS_DEVICE_PATH* sasA = _CR(pathA, SAS_DEVICE_PATH, Header);
SAS_DEVICE_PATH* sasB = _CR(pathB, SAS_DEVICE_PATH, Header);
if(sasA->SasAddress != sasB->SasAddress || sasA->Lun != sasB->Lun || sasA->RelativeTargetPort != sasB->RelativeTargetPort)
{
checkResult = FALSE;
break;
}
}
#endif
if(memcmp(pathA, pathB, EfiDevicePathNodeLength(pathA)))
{
checkResult = FALSE;
break;
}
}
if(!checkResult)
continue;
if(DevPathGetPartitionNumber(devicePath) != number)
continue;
retValue = theHandle;
break;
}
MmFreePool(handleArray);
return retValue;
}
//
// get utf8 name
//
CHAR8* DevPathExtractFilePathName(EFI_DEVICE_PATH_PROTOCOL* devicePath, BOOLEAN fullPath)
{
FILEPATH_DEVICE_PATH* startFilePath = nullptr;
FILEPATH_DEVICE_PATH* endFilePath = nullptr;
UINTN totalLength = 0;
while(!EfiIsDevicePathEnd(devicePath))
{
if(devicePath->Type == MEDIA_DEVICE_PATH && devicePath->SubType == MEDIA_FILEPATH_DP)
{
endFilePath = _CR(devicePath, FILEPATH_DEVICE_PATH, Header);
totalLength += DevicePathNodeLength(devicePath) - SIZE_OF_FILEPATH_DEVICE_PATH + sizeof(CHAR16);
if(!startFilePath)
startFilePath = endFilePath;
}
else if(startFilePath)
{
break;
}
devicePath = EfiNextDevicePathNode(devicePath);
}
if(!startFilePath)
return nullptr;
CHAR16* pathName = nullptr;
CHAR16* allocatedPathName = nullptr;
UINTN pathLength = 0;
if(startFilePath != endFilePath)
{
allocatedPathName = static_cast<CHAR16*>(MmAllocatePool(totalLength));
if(!allocatedPathName)
return nullptr;
pathName = allocatedPathName;
while(TRUE)
{
UINTN length = (DevicePathNodeLength(&startFilePath->Header) - SIZE_OF_FILEPATH_DEVICE_PATH) / sizeof(CHAR16);
for(UINTN i = 0; i < length && startFilePath->PathName[i]; i ++, pathLength ++)
pathName[pathLength] = startFilePath->PathName[i];
if(startFilePath == endFilePath)
break;
startFilePath = _CR(EfiNextDevicePathNode(&startFilePath->Header), FILEPATH_DEVICE_PATH, Header);
}
}
else
{
pathName = startFilePath->PathName;
pathLength = (DevicePathNodeLength(&startFilePath->Header) - SIZE_OF_FILEPATH_DEVICE_PATH) / sizeof(CHAR16);
while(!pathName[pathLength - 1] && pathLength)
pathLength -= 1;
}
CHAR16* lastDirectory = nullptr;
for(UINTN i = 0; i < pathLength && pathName[i]; i ++)
{
if(pathName[i] == L'\\' || pathName[i] == L'/')
lastDirectory = pathName + i;
}
if(lastDirectory && !fullPath)
lastDirectory += 1;
else
lastDirectory = pathName;
CHAR8* retValue = BlAllocateUtf8FromUnicode(lastDirectory, pathName + pathLength - lastDirectory);
if(retValue)
BlConvertPathSeparator(retValue, '/', '\\');
if(allocatedPathName)
MmFreePool(allocatedPathName);
return retValue;
}
//
// append file path
//
EFI_DEVICE_PATH_PROTOCOL* DevPathAppendLastComponent(EFI_DEVICE_PATH_PROTOCOL* devicePath, CHAR8 CONST* fileName, BOOLEAN replaceLastComponent)
{
UINTN fileNameLength = strlen(fileName);
UINTN length = DevPathGetSize(devicePath) + (fileNameLength + 1) * sizeof(CHAR16);
EFI_DEVICE_PATH_PROTOCOL* newDevicePath = static_cast<EFI_DEVICE_PATH_PROTOCOL*>(MmAllocatePool(length));
if(!newDevicePath)
return nullptr;
EFI_DEVICE_PATH_PROTOCOL* dstDevicePath = newDevicePath;
EFI_DEVICE_PATH_PROTOCOL* srcDevicePath = devicePath;
FILEPATH_DEVICE_PATH* srcFilePath = nullptr;
FILEPATH_DEVICE_PATH* dstFilePath = nullptr;
while(!EfiIsDevicePathEnd(srcDevicePath))
{
if(EfiDevicePathType(srcDevicePath) == MEDIA_DEVICE_PATH && srcDevicePath->SubType == MEDIA_FILEPATH_DP)
{
srcFilePath = _CR(srcDevicePath, FILEPATH_DEVICE_PATH, Header);
dstFilePath = _CR(dstDevicePath, FILEPATH_DEVICE_PATH, Header);
}
memcpy(dstDevicePath, srcDevicePath, DevicePathNodeLength(srcDevicePath));
srcDevicePath = EfiNextDevicePathNode(srcDevicePath);
dstDevicePath = EfiNextDevicePathNode(dstDevicePath);
}
if(!srcFilePath || !dstFilePath)
{
MmFreePool(newDevicePath);
return nullptr;
}
dstFilePath->Header.Type = MEDIA_DEVICE_PATH;
dstFilePath->Header.SubType = MEDIA_FILEPATH_DP;
UINTN writePosition = 0;
if(replaceLastComponent)
{
CHAR16* pathName = srcFilePath->PathName;
CHAR16* lastDirectory = nullptr;
UINTN pathLength = (DevicePathNodeLength(&srcFilePath->Header) - SIZE_OF_FILEPATH_DEVICE_PATH) / sizeof(CHAR16);
for(UINTN i = 0; i < pathLength && pathName[i]; i ++)
{
if(pathName[i] == L'\\' || pathName[i] == L'/')
lastDirectory = pathName + i;
}
if(lastDirectory)
lastDirectory += 1;
else
lastDirectory = pathName;
writePosition = lastDirectory - pathName;
}
else
{
writePosition = (DevicePathNodeLength(&srcFilePath->Header) - SIZE_OF_FILEPATH_DEVICE_PATH) / sizeof(CHAR16);
while(!srcFilePath->PathName[writePosition - 1] && writePosition)
writePosition -= 1;
}
UINTN usedLength = ArchConvertPointerToAddress(dstFilePath->PathName + writePosition) - ArchConvertPointerToAddress(newDevicePath);
BlUtf8ToUnicode(fileName, fileNameLength, dstFilePath->PathName + writePosition, (length - usedLength - END_DEVICE_PATH_LENGTH) / sizeof(CHAR16));
UINTN nodeLength = SIZE_OF_FILEPATH_DEVICE_PATH + (wcslen(dstFilePath->PathName) + 1) * sizeof(CHAR16);
SetDevicePathNodeLength(&dstFilePath->Header, nodeLength);
EFI_DEVICE_PATH_PROTOCOL* endOfPath = NextDevicePathNode(&dstFilePath->Header);
SetDevicePathEndNode(endOfPath);
return newDevicePath;
}
