Re: [edk2-staging][PATCH] BaseTools/Fmmt: Fix found the next FFS issue

["Ni, Ray" <ray.ni@intel.com>]

Ok can you add comments to explain:
1. Why 0xFF instead of 0x00 is used as a condition of break (I am not clear).
2. Why 0xFFFFFF is used (I am clear now thanks for the explanation. Please explain in comments).


> -----Original Message-----
> From: Feng, YunhuaX <yunhuax.feng@intel.com>
> Sent: Saturday, May 9, 2020 11:21 AM
> To: Ni, Ray <ray.ni@intel.com>; devel@edk2.groups.io
> Cc: Feng, Bob C <bob.c.feng@intel.com>; Gao, Liming <liming.gao@intel.com>
> Subject: RE: [edk2-staging][PATCH] BaseTools/Fmmt: Fix found the next FFS issue
> 
> Hi Ray,
>    I have checked the  EFI_FFS_FILE_HEADER, the Size only 3 bytes, GetFfsFileLength only return 0xFFFFFF.  I not found existing
> macro
> 
> typedef struct {
> EFI_GUID Name;
> EFI_FFS_INTEGRITY_CHECK IntegrityCheck;
> EFI_FV_FILETYPE Type;
> EFI_FFS_FILE_ATTRIBUTES Attributes;
> UINT8 Size[3];
> EFI_FFS_FILE_STATE State;
> } EFI_FFS_FILE_HEADER
> 
> 
> -----Original Message-----
> From: Ni, Ray <ray.ni@intel.com>
> Sent: Saturday, May 9, 2020 10:46 AM
> To: devel@edk2.groups.io; Feng, YunhuaX <yunhuax.feng@intel.com>
> Cc: Feng, Bob C <bob.c.feng@intel.com>; Gao, Liming <liming.gao@intel.com>
> Subject: RE: [edk2-staging][PATCH] BaseTools/Fmmt: Fix found the next FFS issue
> 
> Yunhua,
> Why the comparison is against 0xFFFFFF not 0xFFFFFFFF?
> 
> Is there any existing macro that you can use?
> 
> Thanks,
> Ray
> 
> > -----Original Message-----
> > From: devel@edk2.groups.io <devel@edk2.groups.io> On Behalf Of Feng, YunhuaX
> > Sent: Saturday, May 9, 2020 9:59 AM
> > To: devel@edk2.groups.io
> > Cc: Feng, Bob C <bob.c.feng@intel.com>; Gao, Liming <liming.gao@intel.com>
> > Subject: [edk2-devel] [edk2-staging][PATCH] BaseTools/Fmmt: Fix found the next FFS issue
> >
> > if found the next FFS size equal 0xFFFFFF, return NOT_FOUND
> >
> > Cc: Bob Feng <bob.c.feng@intel.com>
> > Cc: Liming Gao <liming.gao@intel.com>
> >
> > Signed-off-by: Yunhua Feng <yunhuax.feng@intel.com>
> > ---
> >  BaseTools/Source/C/FMMT/FmmtLib.c | 3 +++
> >  1 file changed, 3 insertions(+)
> >
> > diff --git a/BaseTools/Source/C/FMMT/FmmtLib.c b/BaseTools/Source/C/FMMT/FmmtLib.c
> > index cdbee3d629..4fb10ecfe6 100644
> > --- a/BaseTools/Source/C/FMMT/FmmtLib.c
> > +++ b/BaseTools/Source/C/FMMT/FmmtLib.c
> > @@ -1769,10 +1769,13 @@ FvBufFindNextFile (
> >        (*Key + sizeof (*fhdr)) < fvSize;
> >        *Key = (UINTN)ALIGN_POINTER (*Key, 8)
> >      ) {
> >      fhdr = (EFI_FFS_FILE_HEADER*) ((UINT8*)hdr + *Key);
> >      fsize = GetFfsFileLength (fhdr);
> > +    if (fsize == 0xffffff) {
> > +      break;
> > +    }
> >      if (!EFI_TEST_FFS_ATTRIBUTES_BIT(
> >            FvbAttributes,
> >            fhdr->State,
> >            EFI_FILE_HEADER_VALID
> >          ) ||
> > --
> > 2.12.2.windows.2
> >
> >
> > 
> 
>