void dng_info::Parse (dng_host &host,
dng_stream &stream)
{
fTIFFBlockOffset = stream.Position ();
fTIFFBlockOriginalOffset = stream.PositionInOriginalFile ();
// Check byte order indicator.
uint16 byteOrder = stream.Get_uint16 ();
if (byteOrder == byteOrderII)
{
fBigEndian = false;
#if qDNGValidate
if (gVerbose)
{
printf ("\nUses little-endian byte order\n");
}
#endif
stream.SetLittleEndian ();
}
else if (byteOrder == byteOrderMM)
{
fBigEndian = true;
#if qDNGValidate
if (gVerbose)
{
printf ("\nUses big-endian byte order\n");
}
#endif
stream.SetBigEndian ();
}
else
{
#if qDNGValidate
ReportError ("Unknown byte order");
#endif
ThrowBadFormat ();
}
// Check "magic number" indicator.
fMagic = stream.Get_uint16 ();
#if qDNGValidate
if (gVerbose)
{
printf ("Magic number = %u\n\n", (unsigned) fMagic);
}
#endif
ValidateMagic ();
// Parse IFD 0.
uint64 next_offset = stream.Get_uint32 ();
fExif.Reset (host.Make_dng_exif ());
fShared.Reset (host.Make_dng_shared ());
fIFD [0].Reset (host.Make_dng_ifd ());
ParseIFD (host,
stream,
fExif.Get (),
fShared.Get (),
fIFD [0].Get (),
fTIFFBlockOffset + next_offset,
fTIFFBlockOffset,
0);
next_offset = fIFD [0]->fNextIFD;
fIFDCount = 1;
// Parse chained IFDs.
while (next_offset)
{
if (next_offset >= stream.Length ())
{
#if qDNGValidate
{
ReportWarning ("Chained IFD offset past end of stream");
}
#endif
break;
}
// Some TIFF file writers forget about the next IFD offset, so
// validate the IFD at that offset before parsing it.
if (!ValidateIFD (stream,
fTIFFBlockOffset + next_offset,
fTIFFBlockOffset))
{
#if qDNGValidate
{
ReportWarning ("Chained IFD is not valid");
}
#endif
break;
}
if (fChainedIFDCount == kMaxChainedIFDs)
{
#if qDNGValidate
{
ReportWarning ("Chained IFD count exceeds DNG SDK parsing limit");
}
#endif
break;
}
fChainedIFD [fChainedIFDCount].Reset (host.Make_dng_ifd ());
ParseIFD (host,
stream,
NULL,
NULL,
fChainedIFD [fChainedIFDCount].Get (),
fTIFFBlockOffset + next_offset,
fTIFFBlockOffset,
tcFirstChainedIFD + fChainedIFDCount);
next_offset = fChainedIFD [fChainedIFDCount]->fNextIFD;
fChainedIFDCount++;
}
// Parse SubIFDs.
uint32 searchedIFDs = 0;
bool tooManySubIFDs = false;
while (searchedIFDs < fIFDCount && !tooManySubIFDs)
{
uint32 searchLimit = fIFDCount;
for (uint32 searchIndex = searchedIFDs;
searchIndex < searchLimit && !tooManySubIFDs;
searchIndex++)
{
for (uint32 subIndex = 0;
subIndex < fIFD [searchIndex]->fSubIFDsCount;
subIndex++)
{
if (fIFDCount == kMaxSubIFDs + 1)
{
tooManySubIFDs = true;
break;
}
stream.SetReadPosition (fIFD [searchIndex]->fSubIFDsOffset +
subIndex * 4);
uint32 sub_ifd_offset = stream.Get_uint32 ();
fIFD [fIFDCount].Reset (host.Make_dng_ifd ());
ParseIFD (host,
stream,
fExif.Get (),
fShared.Get (),
fIFD [fIFDCount].Get (),
fTIFFBlockOffset + sub_ifd_offset,
fTIFFBlockOffset,
tcFirstSubIFD + fIFDCount - 1);
fIFDCount++;
}
searchedIFDs = searchLimit;
}
}
#if qDNGValidate
{
if (tooManySubIFDs)
{
ReportWarning ("SubIFD count exceeds DNG SDK parsing limit");
}
}
#endif
// Parse EXIF IFD.
if (fShared->fExifIFD)
{
ParseIFD (host,
stream,
fExif.Get (),
fShared.Get (),
NULL,
fTIFFBlockOffset + fShared->fExifIFD,
fTIFFBlockOffset,
tcExifIFD);
}
// Parse GPS IFD.
if (fShared->fGPSInfo)
{
ParseIFD (host,
stream,
fExif.Get (),
fShared.Get (),
NULL,
fTIFFBlockOffset + fShared->fGPSInfo,
fTIFFBlockOffset,
tcGPSInfo);
}
// Parse Interoperability IFD.
if (fShared->fInteroperabilityIFD)
{
// Some Kodak KDC files have bogus Interoperability IFDs, so
// validate the IFD before trying to parse it.
if (ValidateIFD (stream,
fTIFFBlockOffset + fShared->fInteroperabilityIFD,
fTIFFBlockOffset))
{
ParseIFD (host,
stream,
fExif.Get (),
fShared.Get (),
NULL,
fTIFFBlockOffset + fShared->fInteroperabilityIFD,
fTIFFBlockOffset,
tcInteroperabilityIFD);
}
#if qDNGValidate
else
{
ReportWarning ("The Interoperability IFD is not a valid IFD");
}
#endif
}
// Parse Kodak DCR Private IFD.
if (fShared->fKodakDCRPrivateIFD)
{
ParseIFD (host,
stream,
fExif.Get (),
fShared.Get (),
NULL,
fTIFFBlockOffset + fShared->fKodakDCRPrivateIFD,
fTIFFBlockOffset,
tcKodakDCRPrivateIFD);
}
// Parse Kodak KDC Private IFD.
if (fShared->fKodakKDCPrivateIFD)
{
ParseIFD (host,
stream,
fExif.Get (),
fShared.Get (),
NULL,
fTIFFBlockOffset + fShared->fKodakKDCPrivateIFD,
fTIFFBlockOffset,
tcKodakKDCPrivateIFD);
}
// Parse MakerNote tag.
if (fShared->fMakerNoteCount)
{
ParseMakerNote (host,
stream,
(uint32) (fTIFFBlockOffset + fShared->fMakerNoteCount),
fShared->fMakerNoteOffset,
fTIFFBlockOffset,
0,
stream.Length ());
}
// Parse DNGPrivateData tag.
if (fShared->fDNGPrivateDataCount &&
fShared->fDNGVersion)
{
ParseDNGPrivateData (host, stream);
}
#if qDNGValidate
// If we are running dng_validate on stand-alone camera profile file,
// complete the validation of the profile.
if (fMagic == magicExtendedProfile)
{
dng_camera_profile_info &profileInfo = fShared->fCameraProfile;
dng_camera_profile profile;
profile.Parse (stream, profileInfo);
if (profileInfo.fColorPlanes < 3 || !profile.IsValid (profileInfo.fColorPlanes))
{
ReportError ("Invalid camera profile file");
}
}
#endif
}
