+++ /dev/null
-/*++\r
-\r
-Copyright (c) 2004 - 2006, Intel Corporation \r
-All rights reserved. This program and the accompanying materials \r
-are licensed and made available under the terms and conditions of the BSD License \r
-which accompanies this distribution. The full text of the license may be found at \r
-http://opensource.org/licenses/bsd-license.php \r
- \r
-THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, \r
-WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. \r
-\r
-Module Name:\r
-\r
- FvLib.c\r
-\r
-Abstract:\r
-\r
- These functions assist in parsing and manipulating a Firmware Volume.\r
-\r
---*/\r
-\r
-//\r
-// Include files\r
-//\r
-#include "FvLib.h"\r
-#include "CommonLib.h"\r
-#include "EfiUtilityMsgs.h"\r
-\r
-//\r
-// Module global variables\r
-//\r
-EFI_FIRMWARE_VOLUME_HEADER *mFvHeader = NULL;\r
-UINT32 mFvLength = 0;\r
-\r
-//\r
-// External function implementations\r
-//\r
-EFI_STATUS\r
-InitializeFvLib (\r
- IN VOID *Fv,\r
- IN UINT32 FvLength\r
- )\r
-/*++\r
-\r
-Routine Description:\r
-\r
- This initializes the FV lib with a pointer to the FV and length. It does not\r
- verify the FV in any way.\r
-\r
-Arguments:\r
-\r
- Fv Buffer containing the FV.\r
- FvLength Length of the FV\r
- \r
-Returns:\r
- \r
- EFI_SUCCESS Function Completed successfully.\r
- EFI_INVALID_PARAMETER A required parameter was NULL.\r
-\r
---*/\r
-{\r
- //\r
- // Verify input arguments\r
- //\r
- if (Fv == NULL) {\r
- return EFI_INVALID_PARAMETER;\r
- }\r
-\r
- mFvHeader = (EFI_FIRMWARE_VOLUME_HEADER *) Fv;\r
- mFvLength = FvLength;\r
-\r
- return EFI_SUCCESS;\r
-}\r
-\r
-EFI_STATUS\r
-GetFvHeader (\r
- OUT EFI_FIRMWARE_VOLUME_HEADER **FvHeader,\r
- OUT UINT32 *FvLength\r
- )\r
-/*++\r
-\r
-Routine Description:\r
-\r
- This function returns a pointer to the current FV and the size.\r
-\r
-Arguments:\r
-\r
- FvHeader Pointer to the FV buffer.\r
- FvLength Length of the FV\r
- \r
-Returns:\r
- \r
- EFI_SUCCESS Function Completed successfully.\r
- EFI_INVALID_PARAMETER A required parameter was NULL.\r
- EFI_ABORTED The library needs to be initialized.\r
-\r
---*/\r
-{\r
- //\r
- // Verify library has been initialized.\r
- //\r
- if (mFvHeader == NULL || mFvLength == 0) {\r
- return EFI_ABORTED;\r
- }\r
- //\r
- // Verify input arguments\r
- //\r
- if (FvHeader == NULL) {\r
- return EFI_INVALID_PARAMETER;\r
- }\r
-\r
- *FvHeader = mFvHeader;\r
- return EFI_SUCCESS;\r
-}\r
-\r
-EFI_STATUS\r
-GetNextFile (\r
- IN EFI_FFS_FILE_HEADER *CurrentFile,\r
- OUT EFI_FFS_FILE_HEADER **NextFile\r
- )\r
-/*++\r
-\r
-Routine Description:\r
-\r
- This function returns the next file. If the current file is NULL, it returns\r
- the first file in the FV. If the function returns EFI_SUCCESS and the file \r
- pointer is NULL, then there are no more files in the FV.\r
-\r
-Arguments:\r
-\r
- CurrentFile Pointer to the current file, must be within the current FV.\r
- NextFile Pointer to the next file in the FV.\r
- \r
-Returns:\r
- \r
- EFI_SUCCESS Function completed successfully.\r
- EFI_INVALID_PARAMETER A required parameter was NULL or is out of range.\r
- EFI_ABORTED The library needs to be initialized.\r
-\r
---*/\r
-{\r
- EFI_STATUS Status;\r
-\r
- //\r
- // Verify library has been initialized.\r
- //\r
- if (mFvHeader == NULL || mFvLength == 0) {\r
- return EFI_ABORTED;\r
- }\r
- //\r
- // Verify input arguments\r
- //\r
- if (NextFile == NULL) {\r
- return EFI_INVALID_PARAMETER;\r
- }\r
- //\r
- // Verify FV header\r
- //\r
- Status = VerifyFv (mFvHeader);\r
- if (EFI_ERROR (Status)) {\r
- return EFI_ABORTED;\r
- }\r
- //\r
- // Get first file\r
- //\r
- if (CurrentFile == NULL) {\r
- CurrentFile = (EFI_FFS_FILE_HEADER *) ((UINTN) mFvHeader + mFvHeader->HeaderLength);\r
-\r
- //\r
- // Verify file is valid\r
- //\r
- Status = VerifyFfsFile (CurrentFile);\r
- if (EFI_ERROR (Status)) {\r
- //\r
- // no files in this FV\r
- //\r
- *NextFile = NULL;\r
- return EFI_SUCCESS;\r
- } else {\r
- //\r
- // Verify file is in this FV.\r
- //\r
- if ((UINTN) CurrentFile + GetLength (CurrentFile->Size) > (UINTN) mFvHeader + mFvLength) {\r
- *NextFile = NULL;\r
- return EFI_SUCCESS;\r
- }\r
-\r
- *NextFile = CurrentFile;\r
- return EFI_SUCCESS;\r
- }\r
- }\r
- //\r
- // Verify current file is in range\r
- //\r
- if (((UINTN) CurrentFile < (UINTN) mFvHeader + mFvHeader->HeaderLength) ||\r
- ((UINTN) CurrentFile + GetLength (CurrentFile->Size) > (UINTN) mFvHeader + mFvLength)\r
- ) {\r
- return EFI_INVALID_PARAMETER;\r
- }\r
- //\r
- // Get next file, compensate for 8 byte alignment if necessary.\r
- //\r
- *NextFile = (EFI_FFS_FILE_HEADER *) (((UINTN) CurrentFile + GetLength (CurrentFile->Size) + 0x07) & (-1 << 3));\r
-\r
- //\r
- // Verify file is in this FV.\r
- //\r
- if (((UINTN) *NextFile + sizeof (EFI_FFS_FILE_HEADER) >= (UINTN) mFvHeader + mFvLength) ||\r
- ((UINTN) *NextFile + GetLength ((*NextFile)->Size) > (UINTN) mFvHeader + mFvLength)\r
- ) {\r
- *NextFile = NULL;\r
- return EFI_SUCCESS;\r
- }\r
- //\r
- // Verify file is valid\r
- //\r
- Status = VerifyFfsFile (*NextFile);\r
- if (EFI_ERROR (Status)) {\r
- //\r
- // no more files in this FV\r
- //\r
- *NextFile = NULL;\r
- return EFI_SUCCESS;\r
- }\r
-\r
- return EFI_SUCCESS;\r
-}\r
-\r
-EFI_STATUS\r
-GetFileByName (\r
- IN EFI_GUID *FileName,\r
- OUT EFI_FFS_FILE_HEADER **File\r
- )\r
-/*++\r
-\r
-Routine Description:\r
-\r
- Find a file by name. The function will return NULL if the file is not found.\r
-\r
-Arguments:\r
-\r
- FileName The GUID file name of the file to search for.\r
- File Return pointer. In the case of an error, contents are undefined.\r
-\r
-Returns:\r
-\r
- EFI_SUCCESS The function completed successfully.\r
- EFI_ABORTED An error was encountered.\r
- EFI_INVALID_PARAMETER One of the parameters was NULL.\r
-\r
---*/\r
-{\r
- EFI_FFS_FILE_HEADER *CurrentFile;\r
- EFI_STATUS Status;\r
-\r
- //\r
- // Verify library has been initialized.\r
- //\r
- if (mFvHeader == NULL || mFvLength == 0) {\r
- return EFI_ABORTED;\r
- }\r
- //\r
- // Verify input parameters\r
- //\r
- if (FileName == NULL || File == NULL) {\r
- return EFI_INVALID_PARAMETER;\r
- }\r
- //\r
- // Verify FV header\r
- //\r
- Status = VerifyFv (mFvHeader);\r
- if (EFI_ERROR (Status)) {\r
- return EFI_ABORTED;\r
- }\r
- //\r
- // Get the first file\r
- //\r
- Status = GetNextFile (NULL, &CurrentFile);\r
- if (EFI_ERROR (Status)) {\r
- Error (NULL, 0, 0, "error parsing the FV", NULL);\r
- return EFI_ABORTED;\r
- }\r
- //\r
- // Loop as long as we have a valid file\r
- //\r
- while (CurrentFile) {\r
- if (!CompareGuid (&CurrentFile->Name, FileName)) {\r
- *File = CurrentFile;\r
- return EFI_SUCCESS;\r
- }\r
-\r
- Status = GetNextFile (CurrentFile, &CurrentFile);\r
- if (EFI_ERROR (Status)) {\r
- Error (NULL, 0, 0, "error parsing the FV", NULL);\r
- return EFI_ABORTED;\r
- }\r
- }\r
- //\r
- // File not found in this FV.\r
- //\r
- *File = NULL;\r
- return EFI_SUCCESS;\r
-}\r
-\r
-EFI_STATUS\r
-GetFileByType (\r
- IN EFI_FV_FILETYPE FileType,\r
- IN UINTN Instance,\r
- OUT EFI_FFS_FILE_HEADER **File\r
- )\r
-/*++\r
-\r
-Routine Description:\r
-\r
- Find a file by type and instance. An instance of 1 is the first instance.\r
- The function will return NULL if a matching file cannot be found.\r
- File type EFI_FV_FILETYPE_ALL means any file type is valid.\r
-\r
-Arguments:\r
-\r
- FileType Type of file to search for.\r
- Instance Instace of the file type to return.\r
- File Return pointer. In the case of an error, contents are undefined.\r
-\r
-Returns:\r
-\r
- EFI_SUCCESS The function completed successfully.\r
- EFI_ABORTED An error was encountered.\r
- EFI_INVALID_PARAMETER One of the parameters was NULL.\r
-\r
---*/\r
-{\r
- EFI_FFS_FILE_HEADER *CurrentFile;\r
- EFI_STATUS Status;\r
- UINTN FileCount;\r
-\r
- //\r
- // Verify library has been initialized.\r
- //\r
- if (mFvHeader == NULL || mFvLength == 0) {\r
- return EFI_ABORTED;\r
- }\r
- //\r
- // Verify input parameters\r
- //\r
- if (File == NULL) {\r
- return EFI_INVALID_PARAMETER;\r
- }\r
- //\r
- // Verify FV header\r
- //\r
- Status = VerifyFv (mFvHeader);\r
- if (EFI_ERROR (Status)) {\r
- return EFI_ABORTED;\r
- }\r
- //\r
- // Initialize the number of matching files found.\r
- //\r
- FileCount = 0;\r
-\r
- //\r
- // Get the first file\r
- //\r
- Status = GetNextFile (NULL, &CurrentFile);\r
- if (EFI_ERROR (Status)) {\r
- Error (NULL, 0, 0, "error parsing FV", NULL);\r
- return EFI_ABORTED;\r
- }\r
- //\r
- // Loop as long as we have a valid file\r
- //\r
- while (CurrentFile) {\r
- if (FileType == EFI_FV_FILETYPE_ALL || CurrentFile->Type == FileType) {\r
- FileCount++;\r
- }\r
-\r
- if (FileCount == Instance) {\r
- *File = CurrentFile;\r
- return EFI_SUCCESS;\r
- }\r
-\r
- Status = GetNextFile (CurrentFile, &CurrentFile);\r
- if (EFI_ERROR (Status)) {\r
- Error (NULL, 0, 0, "error parsing the FV", NULL);\r
- return EFI_ABORTED;\r
- }\r
- }\r
-\r
- *File = NULL;\r
- return EFI_SUCCESS;\r
-}\r
-\r
-EFI_STATUS\r
-GetSectionByType (\r
- IN EFI_FFS_FILE_HEADER *File,\r
- IN EFI_SECTION_TYPE SectionType,\r
- IN UINTN Instance,\r
- OUT EFI_FILE_SECTION_POINTER *Section\r
- )\r
-/*++\r
-\r
-Routine Description:\r
-\r
- Find a section in a file by type and instance. An instance of 1 is the first \r
- instance. The function will return NULL if a matching section cannot be found.\r
- The function will not handle encapsulating sections.\r
-\r
-Arguments:\r
-\r
- File The file to search.\r
- SectionType Type of file to search for.\r
- Instance Instace of the section to return.\r
- Section Return pointer. In the case of an error, contents are undefined.\r
-\r
-Returns:\r
-\r
- EFI_SUCCESS The function completed successfully.\r
- EFI_ABORTED An error was encountered.\r
- EFI_INVALID_PARAMETER One of the parameters was NULL.\r
- EFI_NOT_FOUND No found.\r
---*/\r
-{\r
- EFI_FILE_SECTION_POINTER CurrentSection;\r
- EFI_STATUS Status;\r
- UINTN SectionCount;\r
-\r
- //\r
- // Verify input parameters\r
- //\r
- if (File == NULL || Instance == 0) {\r
- return EFI_INVALID_PARAMETER;\r
- }\r
- //\r
- // Verify FFS header\r
- //\r
- Status = VerifyFfsFile (File);\r
- if (EFI_ERROR (Status)) {\r
- Error (NULL, 0, 0, "invalid FFS file", NULL);\r
- return EFI_ABORTED;\r
- }\r
- //\r
- // Initialize the number of matching sections found.\r
- //\r
- SectionCount = 0;\r
-\r
- //\r
- // Get the first section\r
- //\r
- CurrentSection.CommonHeader = (EFI_COMMON_SECTION_HEADER *) ((UINTN) File + sizeof (EFI_FFS_FILE_HEADER));\r
-\r
- //\r
- // Loop as long as we have a valid file\r
- //\r
- while ((UINTN) CurrentSection.CommonHeader < (UINTN) File + GetLength (File->Size)) {\r
- if (CurrentSection.CommonHeader->Type == SectionType) {\r
- SectionCount++;\r
- }\r
-\r
- if (SectionCount == Instance) {\r
- *Section = CurrentSection;\r
- return EFI_SUCCESS;\r
- }\r
- //\r
- // Find next section (including compensating for alignment issues.\r
- //\r
- CurrentSection.CommonHeader = (EFI_COMMON_SECTION_HEADER *) ((((UINTN) CurrentSection.CommonHeader) + GetLength (CurrentSection.CommonHeader->Size) + 0x03) & (-1 << 2));\r
- }\r
- //\r
- // Section not found\r
- //\r
- (*Section).Code16Section = NULL;\r
- return EFI_NOT_FOUND;\r
-}\r
-//\r
-// will not parse compressed sections\r
-//\r
-EFI_STATUS\r
-VerifyFv (\r
- IN EFI_FIRMWARE_VOLUME_HEADER *FvHeader\r
- )\r
-/*++\r
-\r
-Routine Description:\r
-\r
- Verify the current pointer points to a valid FV header.\r
-\r
-Arguments:\r
-\r
- FvHeader Pointer to an alleged FV file.\r
-\r
-Returns:\r
-\r
- EFI_SUCCESS The FV header is valid.\r
- EFI_VOLUME_CORRUPTED The FV header is not valid.\r
- EFI_INVALID_PARAMETER A required parameter was NULL.\r
- EFI_ABORTED Operation aborted.\r
-\r
---*/\r
-{\r
- UINT16 Checksum;\r
-\r
- //\r
- // Verify input parameters\r
- //\r
- if (FvHeader == NULL) {\r
- return EFI_INVALID_PARAMETER;\r
- }\r
-\r
- if (FvHeader->Signature != EFI_FVH_SIGNATURE) {\r
- Error (NULL, 0, 0, "invalid FV header signature", NULL);\r
- return EFI_VOLUME_CORRUPTED;\r
- }\r
- //\r
- // Verify header checksum\r
- //\r
- Checksum = CalculateSum16 ((UINT16 *) FvHeader, FvHeader->HeaderLength / sizeof (UINT16));\r
-\r
- if (Checksum != 0) {\r
- Error (NULL, 0, 0, "invalid FV header checksum", NULL);\r
- return EFI_ABORTED;\r
- }\r
-\r
- return EFI_SUCCESS;\r
-}\r
-\r
-EFI_STATUS\r
-VerifyFfsFile (\r
- IN EFI_FFS_FILE_HEADER *FfsHeader\r
- )\r
-/*++\r
-\r
-Routine Description:\r
-\r
- Verify the current pointer points to a FFS file header.\r
-\r
-Arguments:\r
-\r
- FfsHeader Pointer to an alleged FFS file.\r
-\r
-Returns:\r
-\r
- EFI_SUCCESS The Ffs header is valid.\r
- EFI_NOT_FOUND This "file" is the beginning of free space.\r
- EFI_VOLUME_CORRUPTED The Ffs header is not valid.\r
- EFI_ABORTED The erase polarity is not known.\r
-\r
---*/\r
-{\r
- BOOLEAN ErasePolarity;\r
- EFI_STATUS Status;\r
- EFI_FFS_FILE_HEADER BlankHeader;\r
- UINT8 Checksum;\r
- UINT32 FileLength;\r
- UINT32 OccupiedFileLength;\r
- EFI_FFS_FILE_TAIL *Tail;\r
- UINT8 SavedChecksum;\r
- UINT8 SavedState;\r
- UINT8 FileGuidString[80];\r
- UINT32 TailSize;\r
- //\r
- // Verify library has been initialized.\r
- //\r
- if (mFvHeader == NULL || mFvLength == 0) {\r
- return EFI_ABORTED;\r
- }\r
- //\r
- // Verify FV header\r
- //\r
- Status = VerifyFv (mFvHeader);\r
- if (EFI_ERROR (Status)) {\r
- return EFI_ABORTED;\r
- }\r
- //\r
- // Get the erase polarity.\r
- //\r
- Status = GetErasePolarity (&ErasePolarity);\r
- if (EFI_ERROR (Status)) {\r
- return EFI_ABORTED;\r
- }\r
- //\r
- // Check if we have free space\r
- //\r
- if (ErasePolarity) {\r
- memset (&BlankHeader, -1, sizeof (EFI_FFS_FILE_HEADER));\r
- } else {\r
- memset (&BlankHeader, 0, sizeof (EFI_FFS_FILE_HEADER));\r
- }\r
-\r
- if (memcmp (&BlankHeader, FfsHeader, sizeof (EFI_FFS_FILE_HEADER)) == 0) {\r
- return EFI_NOT_FOUND;\r
- }\r
- //\r
- // Convert the GUID to a string so we can at least report which file\r
- // if we find an error.\r
- //\r
- PrintGuidToBuffer (&FfsHeader->Name, FileGuidString, sizeof (FileGuidString), TRUE);\r
- if (FfsHeader->Attributes & FFS_ATTRIB_TAIL_PRESENT) {\r
- TailSize = sizeof (EFI_FFS_FILE_TAIL);\r
- } else {\r
- TailSize = 0;\r
- }\r
- //\r
- // Verify file header checksum\r
- //\r
- SavedState = FfsHeader->State;\r
- FfsHeader->State = 0;\r
- SavedChecksum = FfsHeader->IntegrityCheck.Checksum.File;\r
- FfsHeader->IntegrityCheck.Checksum.File = 0;\r
- Checksum = CalculateSum8 ((UINT8 *) FfsHeader, sizeof (EFI_FFS_FILE_HEADER));\r
- FfsHeader->State = SavedState;\r
- FfsHeader->IntegrityCheck.Checksum.File = SavedChecksum;\r
- if (Checksum != 0) {\r
- Error (NULL, 0, 0, FileGuidString, "invalid FFS file header checksum");\r
- return EFI_ABORTED;\r
- }\r
- //\r
- // Verify file checksum\r
- //\r
- if (FfsHeader->Attributes & FFS_ATTRIB_CHECKSUM) {\r
- //\r
- // Verify file data checksum\r
- //\r
- FileLength = GetLength (FfsHeader->Size);\r
- OccupiedFileLength = (FileLength + 0x07) & (-1 << 3);\r
- Checksum = CalculateSum8 ((UINT8 *) FfsHeader, FileLength - TailSize);\r
- Checksum = (UINT8) (Checksum - FfsHeader->State);\r
- if (Checksum != 0) {\r
- Error (NULL, 0, 0, FileGuidString, "invalid FFS file checksum");\r
- return EFI_ABORTED;\r
- }\r
- } else {\r
- //\r
- // File does not have a checksum\r
- // Verify contents are 0x5A as spec'd\r
- //\r
- if (FfsHeader->IntegrityCheck.Checksum.File != FFS_FIXED_CHECKSUM) {\r
- Error (NULL, 0, 0, FileGuidString, "invalid fixed FFS file header checksum");\r
- return EFI_ABORTED;\r
- }\r
- }\r
- //\r
- // Check if the tail is present and verify it if it is.\r
- //\r
- if (FfsHeader->Attributes & FFS_ATTRIB_TAIL_PRESENT) {\r
- //\r
- // Verify tail is complement of integrity check field in the header.\r
- //\r
- Tail = (EFI_FFS_FILE_TAIL *) ((UINTN) FfsHeader + GetLength (FfsHeader->Size) - sizeof (EFI_FFS_FILE_TAIL));\r
- if (FfsHeader->IntegrityCheck.TailReference != (EFI_FFS_FILE_TAIL)~(*Tail)) {\r
- Error (NULL, 0, 0, FileGuidString, "invalid FFS file tail");\r
- return EFI_ABORTED;\r
- }\r
- }\r
-\r
- return EFI_SUCCESS;\r
-}\r
-\r
-UINT32\r
-GetLength (\r
- UINT8 *ThreeByteLength\r
- )\r
-/*++\r
-\r
-Routine Description:\r
-\r
- Converts a three byte length value into a UINT32.\r
-\r
-Arguments:\r
-\r
- ThreeByteLength Pointer to the first of the 3 byte length.\r
-\r
-Returns:\r
-\r
- UINT32 Size of the section\r
-\r
---*/\r
-{\r
- UINT32 Length;\r
-\r
- if (ThreeByteLength == NULL) {\r
- return 0;\r
- }\r
-\r
- Length = *((UINT32 *) ThreeByteLength);\r
- Length = Length & 0x00FFFFFF;\r
-\r
- return Length;\r
-}\r
-\r
-EFI_STATUS\r
-GetErasePolarity (\r
- OUT BOOLEAN *ErasePolarity\r
- )\r
-/*++\r
-\r
-Routine Description:\r
-\r
- This function returns with the FV erase polarity. If the erase polarity\r
- for a bit is 1, the function return TRUE.\r
-\r
-Arguments:\r
-\r
- ErasePolarity A pointer to the erase polarity.\r
-\r
-Returns:\r
-\r
- EFI_SUCCESS The function completed successfully.\r
- EFI_INVALID_PARAMETER One of the input parameters was invalid.\r
- EFI_ABORTED Operation aborted.\r
- \r
---*/\r
-{\r
- EFI_STATUS Status;\r
-\r
- //\r
- // Verify library has been initialized.\r
- //\r
- if (mFvHeader == NULL || mFvLength == 0) {\r
- return EFI_ABORTED;\r
- }\r
- //\r
- // Verify FV header\r
- //\r
- Status = VerifyFv (mFvHeader);\r
- if (EFI_ERROR (Status)) {\r
- return EFI_ABORTED;\r
- }\r
- //\r
- // Verify input parameters.\r
- //\r
- if (ErasePolarity == NULL) {\r
- return EFI_INVALID_PARAMETER;\r
- }\r
-\r
- if (mFvHeader->Attributes & EFI_FVB_ERASE_POLARITY) {\r
- *ErasePolarity = TRUE;\r
- } else {\r
- *ErasePolarity = FALSE;\r
- }\r
-\r
- return EFI_SUCCESS;\r
-}\r
-\r
-UINT8\r
-GetFileState (\r
- IN BOOLEAN ErasePolarity,\r
- IN EFI_FFS_FILE_HEADER *FfsHeader\r
- )\r
-/*++\r
-\r
-Routine Description:\r
-\r
- This function returns a the highest state bit in the FFS that is set.\r
- It in no way validate the FFS file.\r
-\r
-Arguments:\r
- \r
- ErasePolarity The erase polarity for the file state bits.\r
- FfsHeader Pointer to a FFS file.\r
-\r
-Returns:\r
-\r
- UINT8 The hightest set state of the file.\r
-\r
---*/\r
-{\r
- UINT8 FileState;\r
- UINT8 HighestBit;\r
-\r
- FileState = FfsHeader->State;\r
-\r
- if (ErasePolarity) {\r
- FileState = (UINT8)~FileState;\r
- }\r
-\r
- HighestBit = 0x80;\r
- while (HighestBit != 0 && (HighestBit & FileState) == 0) {\r
- HighestBit >>= 1;\r
- }\r
-\r
- return HighestBit;\r
-}\r
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