Ffs.c revision 4fd606d1f5abe38e1f42c38de1d2e895166bd0f4
/** @file
FFS file access utilities.
Copyright (c) 2006 - 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
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 "DxeMain.h"
#include "FwVolDriver.h"
/**
Get the FFS file state by checking the highest bit set in the header's state field.
@param ErasePolarity Erase polarity attribute of the firmware volume
@param FfsHeader Points to the FFS file header
@return FFS File state
**/
)
{
if (ErasePolarity != 0) {
}
HighestBit = 0x80;
HighestBit >>= 1;
}
return (EFI_FFS_FILE_STATE) HighestBit;
}
/**
Check if a block of buffer is erased.
@param ErasePolarity Erase polarity attribute of the firmware volume
@param InBuffer The buffer to be checked
@param BufferSize Size of the buffer in bytes
@retval TRUE The block of buffer is erased
@retval FALSE The block of buffer is not erased
**/
)
{
if(ErasePolarity == 1) {
EraseByte = 0xFF;
} else {
EraseByte = 0;
}
return FALSE;
}
}
return TRUE;
}
/**
Verify checksum of the firmware volume header.
@param FvHeader Points to the firmware volume header to be checked
@retval TRUE Checksum verification passed
@retval FALSE Checksum verification failed
**/
)
{
if (Checksum == 0) {
return TRUE;
} else {
return FALSE;
}
}
/**
Verify checksum of the FFS file header.
@param FfsHeader Points to the FFS file header to be checked
@retval TRUE Checksum verification passed
@retval FALSE Checksum verification failed
**/
)
{
if (IS_FFS_FILE2 (FfsHeader)) {
} else {
}
HeaderChecksum = (UINT8) (HeaderChecksum - FfsHeader->State - FfsHeader->IntegrityCheck.Checksum.File);
if (HeaderChecksum == 0) {
return TRUE;
} else {
return FALSE;
}
}
/**
Check if it's a valid FFS file header.
@param ErasePolarity Erase polarity attribute of the firmware volume
@param FfsHeader Points to the FFS file header to be checked
@param FileState FFS file state to be returned
@retval TRUE Valid FFS file header
@retval FALSE Invalid FFS file header
**/
)
{
switch (*FileState) {
case EFI_FILE_HEADER_VALID:
case EFI_FILE_DATA_VALID:
case EFI_FILE_DELETED:
//
// Here we need to verify header checksum
//
return VerifyHeaderChecksum (FfsHeader);
case EFI_FILE_HEADER_INVALID:
default:
return FALSE;
}
}
/**
Check if it's a valid FFS file.
Here we are sure that it has a valid FFS file header since we must call IsValidFfsHeader() first.
@param ErasePolarity Erase polarity attribute of the firmware volume
@param FfsHeader Points to the FFS file to be checked
@retval TRUE Valid FFS file
@retval FALSE Invalid FFS file
**/
)
{
switch (FileState) {
case EFI_FILE_DELETED:
case EFI_FILE_DATA_VALID:
if (IS_FFS_FILE2 (FfsHeader)) {
DataCheckSum = CalculateCheckSum8 ((CONST UINT8 *) FfsHeader + sizeof (EFI_FFS_FILE_HEADER2), FFS_FILE2_SIZE (FfsHeader) - sizeof(EFI_FFS_FILE_HEADER2));
} else {
DataCheckSum = CalculateCheckSum8 ((CONST UINT8 *) FfsHeader + sizeof (EFI_FFS_FILE_HEADER), FFS_FILE_SIZE (FfsHeader) - sizeof(EFI_FFS_FILE_HEADER));
}
}
return TRUE;
}
default:
return FALSE;
}
}