void dng_gain_map::PutStream (dng_stream &stream) const
	{
	
	stream.Put_uint32 (fPoints.v);
	stream.Put_uint32 (fPoints.h);
	
	stream.Put_real64 (fSpacing.v);
	stream.Put_real64 (fSpacing.h);
	
	stream.Put_real64 (fOrigin.v);
	stream.Put_real64 (fOrigin.h);
	
	stream.Put_uint32 (fPlanes);
	
	for (int32 rowIndex = 0; rowIndex < fPoints.v; rowIndex++)
		{
		
		for (int32 colIndex = 0; colIndex < fPoints.h; colIndex++)
			{
			
			for (uint32 plane = 0; plane < fPlanes; plane++)
				{
				
				stream.Put_real32 (Entry (rowIndex,
										  colIndex,
										  plane));
										  
				}
				
			}
			
		}
	
	}

dng_opcode_GainMap::dng_opcode_GainMap (dng_host &host,
										dng_stream &stream)
												
	:	dng_inplace_opcode (dngOpcode_GainMap,
							stream,
							"GainMap")
							
	,	fAreaSpec ()
							
	,	fGainMap ()
							
	{
	
	uint32 byteCount = stream.Get_uint32 ();
	
	uint64 startPosition = stream.Position ();
	
	fAreaSpec.GetData (stream);
	
	fGainMap.Reset (dng_gain_map::GetStream (host, stream));
	
	if (stream.Position () != startPosition + byteCount)
		{
		ThrowBadFormat ();
		}
		
	}

void dng_stream::DuplicateStream (dng_stream &dstStream)
	{
	
	// Turn off sniffers for this operation.
	
	TempStreamSniffer noSniffer1 (*this    , NULL);
	TempStreamSniffer noSniffer2 (dstStream, NULL);
		
	// First grow the destination stream if required, in an attempt to
	// reserve any needed space before overwriting the existing data.
	
	if (dstStream.Length () < Length ())
		{
		dstStream.SetLength (Length ());
		}
		
	SetReadPosition (0);
	
	dstStream.SetWritePosition (0);
	
	CopyToStream (dstStream, Length ());
	
	dstStream.Flush ();
							
	dstStream.SetLength (Length ());

	}

void dng_camera_profile::ReadHueSatMap (dng_stream &stream,
										dng_hue_sat_map &hueSatMap,
										uint32 hues,
										uint32 sats,
										uint32 vals,
										bool skipSat0)
	{

	hueSatMap.SetDivisions (hues, sats, vals);

	for (uint32 val = 0; val < vals; val++)
		{

		for (uint32 hue = 0; hue < hues; hue++)
			{

			for (uint32 sat = skipSat0 ? 1 : 0; sat < sats; sat++)
				{

				dng_hue_sat_map::HSBModify modify;

				modify.fHueShift = stream.Get_real32 ();
				modify.fSatScale = stream.Get_real32 ();
				modify.fValScale = stream.Get_real32 ();

				hueSatMap.SetDelta (hue, sat, val, modify);
				
				}
				
			}
			
		}
	
	}

dng_opcode_MapPolynomial::dng_opcode_MapPolynomial (dng_stream &stream)

	:	dng_inplace_opcode (dngOpcode_MapPolynomial,
							stream,
							"MapPolynomial")

	,	fAreaSpec ()
	,	fDegree   (0)

	{

	uint32 dataSize = stream.Get_uint32 ();

	fAreaSpec.GetData (stream);

	fDegree = stream.Get_uint32 ();

	if (dataSize != dng_area_spec::kDataSize + 4 + (fDegree + 1) * 8)
		{
		ThrowBadFormat ();
		}

	if (fDegree > kMaxDegree)
		{
		ThrowBadFormat ();
		}

	for (uint32 j = 0; j <= kMaxDegree; j++)
		{

		if (j <= fDegree)
			{
			fCoefficient [j] = stream.Get_real64 ();
			}
		else
			{
			fCoefficient [j] = 0.0;
			}

		}

	#if qDNGValidate

	if (gVerbose)
		{

		for (uint32 k = 0; k <= fDegree; k++)
			{
			printf ("    Coefficient [%u] = %f\n", k, fCoefficient [k]);
			}

		}

	#endif

	}

void dng_opcode_TrimBounds::PutData (dng_stream &stream) const
	{

	stream.Put_uint32 (16);

	stream.Put_int32 (fBounds.t);
	stream.Put_int32 (fBounds.l);
	stream.Put_int32 (fBounds.b);
	stream.Put_int32 (fBounds.r);

	}

void dng_area_spec::GetData (dng_stream &stream)
	{

	fArea.t = stream.Get_int32 ();
	fArea.l = stream.Get_int32 ();
	fArea.b = stream.Get_int32 ();
	fArea.r = stream.Get_int32 ();

	fPlane  = stream.Get_uint32 ();
	fPlanes = stream.Get_uint32 ();

	fRowPitch = stream.Get_uint32 ();
	fColPitch = stream.Get_uint32 ();

	if (fPlanes < 1)
		{
		ThrowBadFormat ();
		}

	if (fRowPitch < 1 || fColPitch < 1)
		{
		ThrowBadFormat ();
		}

	if (fArea.IsEmpty () && (fRowPitch != 1 || fColPitch != 1))
		{
		ThrowBadFormat ();
		}

	#if qDNGValidate

	if (gVerbose)
		{

		printf ("AreaSpec: t=%d, l=%d, b=%d, r=%d, p=%u:%u, rp=%u, cp=%u\n",
				(int) fArea.t,
				(int) fArea.l,
				(int) fArea.b,
				(int) fArea.r,
				(unsigned) fPlane,
				(unsigned) fPlanes,
				(unsigned) fRowPitch,
				(unsigned) fColPitch);

		}

	#endif

	}

void dng_jpeg_preview::WriteData (dng_host & /* host */,
								  dng_image_writer & /* writer */,
								  dng_basic_tag_set &basic,
								  dng_stream &stream) const
	{
	
	basic.SetTileOffset (0, (uint32) stream.Position ());
	
	basic.SetTileByteCount (0, fCompressedData->LogicalSize ());
	
	stream.Put (fCompressedData->Buffer      (),
				fCompressedData->LogicalSize ());

	if (fCompressedData->LogicalSize () & 1)
		{
		stream.Put_uint8 (0);
		}
			
	}

void dng_stream::CopyToStream (dng_stream &dstStream,
							   uint64 count)
	{
	
	uint8 smallBuffer [1024];
		
	if (count <= sizeof (smallBuffer))
		{
		
		Get (smallBuffer, (uint32) count);
		
		dstStream.Put (smallBuffer, (uint32) count);
		
		}
		
	else
		{
	
		const uint32 bigBufferSize = (uint32) Min_uint64 (kBigBufferSize,
													      count);
		
		dng_memory_data bigBuffer (bigBufferSize);
		
		while (count)
			{
			
			uint32 blockCount = (uint32) Min_uint64 (bigBufferSize,
													 count);
													 
			Get (bigBuffer.Buffer (),
				 blockCount);
			
			dstStream.Put (bigBuffer.Buffer (),
						   blockCount);
						   
			count -= blockCount;
			
			}
	
		}

	}

void dng_opcode_GainMap::PutData (dng_stream &stream) const
	{
	
	stream.Put_uint32 (dng_area_spec::kDataSize +
					   fGainMap->PutStreamSize ());
					   
	fAreaSpec.PutData (stream);
	
	fGainMap->PutStream (stream);
	
	}

TempStreamSniffer::TempStreamSniffer (dng_stream &stream,
									  dng_abort_sniffer *sniffer)
	
	:	fStream     (stream)
	,	fOldSniffer (stream.Sniffer ())
	
	{
	
	fStream.SetSniffer (sniffer);
	
	}

void dng_iptc::ParseString (dng_stream &stream,
						    dng_string &s,
						    CharSet charSet)
	{
	
	uint32 length = stream.Get_uint16 ();
	
	dng_memory_data buffer (length + 1);
	
	char *c = buffer.Buffer_char ();
	
	stream.Get (c, length);
	
	c [length] = 0;
	
	switch (charSet)
		{
		
		case kCharSetUTF8:
			{
			s.Set_UTF8 (c);
			break;
			}
			
		default:
			{
			s.Set_SystemEncoding (c);
			}
			
		}
	
	s.SetLineEndingsToNewLines ();
	
	s.StripLowASCII ();
	
	s.TrimTrailingBlanks ();
	
	}

void dng_memory_stream::CopyToStream (dng_stream &dstStream,
									  uint64 count)
	{
	
	if (count < kBigBufferSize)
		{
	
		dng_stream::CopyToStream (dstStream, count);
		
		}
		
	else
		{
		
		Flush ();
		
		uint64 offset = Position ();
		
		if (offset + count > Length ())
			{
			
			ThrowEndOfFile ();
			
			}
			
		while (count)
			{
			
			uint32 pageIndex  = (uint32) (offset / fPageSize);
			uint32 pageOffset = (uint32) (offset % fPageSize);
			
			uint32 blockCount = (uint32) Min_uint64 (fPageSize - pageOffset, count);
			
			const uint8 *sPtr = fPageList [pageIndex]->Buffer_uint8 () +
								pageOffset;
								
			dstStream.Put (sPtr, blockCount);
			
			offset += blockCount;
			count  -= blockCount;
			
			}
			
		SetReadPosition (offset);
	
		}
	
	}

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.
//.........这里部分代码省略.........

void dng_info::ParseTag (dng_host &host,
						 dng_stream &stream,
						 dng_exif *exif,
						 dng_shared *shared,
						 dng_ifd *ifd,
						 uint32 parentCode,
						 uint32 tagCode,
						 uint32 tagType,
						 uint32 tagCount,
						 uint64 tagOffset,
						 int64 offsetDelta)
	{
	
	bool isSubIFD = parentCode >= tcFirstSubIFD &&
					parentCode <= tcLastSubIFD;
					  
	bool isMainIFD = (parentCode == 0 || isSubIFD) &&
					 ifd &&
					 ifd->fUsesNewSubFileType &&
			 		 ifd->fNewSubFileType == sfMainImage;
			 		 
	// Panasonic RAW format stores private tags using tag codes < 254 in
	// IFD 0.  Redirect the parsing of these tags into a logical
	// "PanasonicRAW" IFD.
	
	// Panasonic is starting to use some higher numbers also (280..283).
			 		 
	if (fMagic == 85 && parentCode == 0 && (tagCode < tcNewSubFileType ||
											(tagCode >= 280 && tagCode <= 283)))
		{
		
		parentCode = tcPanasonicRAW;
		
		ifd = NULL;
		
		}
	
	stream.SetReadPosition (tagOffset);
		
	if (ifd && ifd->ParseTag (stream,
						 	  parentCode,
						 	  tagCode,
						 	  tagType,
						 	  tagCount,
						 	  tagOffset))
		{
		
		return;
		
		}
		
	stream.SetReadPosition (tagOffset);
		
	if (exif && shared && exif->ParseTag (stream,
										  *shared,
										  parentCode,
										  isMainIFD,
										  tagCode,
										  tagType,
										  tagCount,
										  tagOffset))
		{
		
		return;
		
		}
		
	stream.SetReadPosition (tagOffset);
		
	if (shared && exif && shared->ParseTag (stream,
											*exif,
								    		parentCode,
								    		isMainIFD,
								    		tagCode,
								    		tagType,
								    		tagCount,
								    		tagOffset,
								    		offsetDelta))
		{
		
		return;
		
		}
		
	if (parentCode == tcOlympusMakerNote &&
		tagType == ttUndefined &&
		tagCount >= 14)
		{
		
		uint32 olympusMakerParent = 0;
		
		switch (tagCode)
			{
			
			case 8208:
				olympusMakerParent = tcOlympusMakerNote8208;
				break;
				
			case 8224:
				olympusMakerParent = tcOlympusMakerNote8224;
//.........这里部分代码省略.........

void dng_info::ParseMakerNote (dng_host &host,
							   dng_stream &stream,
							   uint32 makerNoteCount,
							   uint64 makerNoteOffset,
							   int64 offsetDelta,
							   uint64 minOffset,
							   uint64 maxOffset)
	{
	
	uint8 firstBytes [16];
	
	memset (firstBytes, 0, sizeof (firstBytes));
	
	stream.SetReadPosition (makerNoteOffset);
	
	stream.Get (firstBytes, (uint32) Min_uint64 (sizeof (firstBytes),
												 makerNoteCount));
	
	// Epson MakerNote with header.
	
	if (memcmp (firstBytes, "EPSON\000\001\000", 8) == 0)
		{
		
		if (makerNoteCount > 8)
			{
		
			ParseMakerNoteIFD (host,
							   stream,
							   makerNoteCount - 8,
				   	  		   makerNoteOffset + 8,
				   	  		   offsetDelta,
				   	  		   minOffset,
				   	  		   maxOffset,
				   	  		   tcEpsonMakerNote);
				   	  		   
			}
			
		return;
		
		}
		
	// Fujifilm MakerNote.
	
	if (memcmp (firstBytes, "FUJIFILM", 8) == 0)
		{
		
		stream.SetReadPosition (makerNoteOffset + 8);
		
		TempLittleEndian tempEndian (stream);
		
		uint32 ifd_offset = stream.Get_uint32 ();
		
		if (ifd_offset >= 12 && ifd_offset < makerNoteCount)
			{
			
			ParseMakerNoteIFD (host,
							   stream,
							   makerNoteCount - ifd_offset,
							   makerNoteOffset + ifd_offset,
							   makerNoteOffset,
							   minOffset,
							   maxOffset,
							   tcFujiMakerNote);
			
			}
			
		return;
					
		}
		
	// Leica MakerNote.
	
	if (memcmp (firstBytes, "LEICA\000\000\000", 8) == 0)
		{
		
		if (makerNoteCount > 8)
			{
		
			ParseMakerNoteIFD (host,
							   stream,
							   makerNoteCount - 8,
							   makerNoteOffset + 8,
							   makerNoteOffset,
							   minOffset,
							   maxOffset,
							   tcLeicaMakerNote);
							   
			}
		
		return;
		
		}
		
	// Nikon version 2 MakerNote with header.
	
	if (memcmp (firstBytes, "Nikon\000\002", 7) == 0)
		{
		
		stream.SetReadPosition (makerNoteOffset + 10);
		
//.........这里部分代码省略.........

bool dng_info::ParseMakerNoteIFD (dng_host &host,
								  dng_stream &stream,
								  uint64 ifdSize,
						 		  uint64 ifdOffset,
								  int64 offsetDelta,
								  uint64 minOffset,
								  uint64 maxOffset,
						 		  uint32 parentCode)
	{
	
	uint32 tagIndex;
	uint32 tagCode;
	uint32 tagType;
	uint32 tagCount;
	
	// Assume there is no next IFD pointer.
	
	fMakerNoteNextIFD = 0;
	
	// If size is too small to hold a single entry IFD, abort.
	
	if (ifdSize < 14)
		{
		return false;
		}
		
	// Get entry count.
	
	stream.SetReadPosition (ifdOffset);
	
	uint32 ifdEntries = stream.Get_uint16 ();
	
	// Make the entry count if reasonable for the MakerNote size.
	
	if (ifdEntries < 1 || 2 + ifdEntries * 12 > ifdSize)
		{
		return false;
		}
		
	// Scan IFD to verify all the tag types are all valid.
		
	for (tagIndex = 0; tagIndex < ifdEntries; tagIndex++)
		{
		
		stream.SetReadPosition (ifdOffset + 2 + tagIndex * 12 + 2);
		
		tagType = stream.Get_uint16 ();
		
		// Kludge: Some Canon MakerNotes contain tagType = 0 tags, so we
		// need to ignore them.  This was a "firmware 1.0.4" Canon 40D raw file.
		
		if (parentCode == tcCanonMakerNote && tagType == 0)
			{
			continue;
			}
		
		if (TagTypeSize (tagType) == 0)
			{
			return false;
			}
		
		}
		
	// OK, the IFD looks reasonable enough to parse.
	
	#if qDNGValidate
	
	if (gVerbose)
		{
		
		printf ("%s: Offset = %u, Entries = %u\n\n",
				LookupParentCode (parentCode),
			    (unsigned) ifdOffset, 
			    (unsigned) ifdEntries);
		
		}
		
	#endif
		
	for (tagIndex = 0; tagIndex < ifdEntries; tagIndex++)
		{
		
		stream.SetReadPosition (ifdOffset + 2 + tagIndex * 12);
		
		tagCode  = stream.Get_uint16 ();
		tagType  = stream.Get_uint16 ();
		tagCount = stream.Get_uint32 ();
		
		if (tagType == 0)
			{
			continue;
			}
		
		uint32 tagSize = tagCount * TagTypeSize (tagType);
		
		uint64 tagOffset = ifdOffset + 2 + tagIndex * 12 + 8;
		
		if (tagSize > 4)
			{
			
//.........这里部分代码省略.........

void dng_info::ParseIFD (dng_host &host,
						 dng_stream &stream,
						 dng_exif *exif,
						 dng_shared *shared,
						 dng_ifd *ifd,
						 uint64 ifdOffset,
						 int64 offsetDelta,
						 uint32 parentCode)
	{
	
	#if qDNGValidate

	bool isMakerNote = (parentCode >= tcFirstMakerNoteIFD &&
						parentCode <= tcLastMakerNoteIFD);
	
	#endif

	stream.SetReadPosition (ifdOffset);
	
	if (ifd)
		{
		ifd->fThisIFD = ifdOffset;
		}
	
	uint32 ifdEntries = stream.Get_uint16 ();
	
	#if qDNGValidate
	
	if (gVerbose)
		{
		
		printf ("%s: Offset = %u, Entries = %u\n\n",
				LookupParentCode (parentCode),
			    (unsigned) ifdOffset, 
			    (unsigned) ifdEntries);
		
		}
		
	if ((ifdOffset & 1) && !isMakerNote)
		{
		
		char message [256];
	
		sprintf (message,
				 "%s has odd offset (%u)",
				 LookupParentCode (parentCode),
				 (unsigned) ifdOffset);
					 
		ReportWarning (message);
		
		}
		
	#endif
		
	uint32 prev_tag_code = 0;
		
	for (uint32 tag_index = 0; tag_index < ifdEntries; tag_index++)
		{
		
		stream.SetReadPosition (ifdOffset + 2 + tag_index * 12);
		
		uint32 tagCode  = stream.Get_uint16 ();
		uint32 tagType  = stream.Get_uint16 ();
		
		// Minolta 7D files have a bug in the EXIF block where the count
		// is wrong, and we run off into next IFD link.  So if abort parsing
		// if we get a zero code/type combinations.
		
		if (tagCode == 0 && tagType == 0)
			{
			
			#if qDNGValidate
			
			char message [256];
	
			sprintf (message,
					 "%s had zero/zero tag code/type entry",
					 LookupParentCode (parentCode));
					 
			ReportWarning (message);
			
			#endif
			
			return;
			
			}
		
		uint32 tagCount = stream.Get_uint32 ();
		
		#if qDNGValidate

			{
		
			if (tag_index > 0 && tagCode <= prev_tag_code && !isMakerNote)
				{
				
				char message [256];
		
				sprintf (message,
						 "%s tags are not sorted in ascending numerical order",
//.........这里部分代码省略.........

bool dng_info::ValidateIFD (dng_stream &stream,
						    uint64 ifdOffset,
						    int64 offsetDelta)
	{
	
	// Make sure we have a count.
	
	if (ifdOffset + 2 > stream.Length ())
		{
		return false;
		}
		
	// Get entry count.
		
	stream.SetReadPosition (ifdOffset);
	
	uint32 ifdEntries = stream.Get_uint16 ();
	
	if (ifdEntries < 1)
		{
		return false;
		}
		
	// Make sure we have room for all entries and next IFD link.
		
	if (ifdOffset + 2 + ifdEntries * 12 + 4 > stream.Length ())
		{
		return false;
		}
		
	// Check each entry.
	
	for (uint32 tag_index = 0; tag_index < ifdEntries; tag_index++)
		{
		
		stream.SetReadPosition (ifdOffset + 2 + tag_index * 12);
		
		stream.Skip (2);		// Ignore tag code.
		
		uint32 tagType  = stream.Get_uint16 ();
		uint32 tagCount = stream.Get_uint32 ();
		
		uint32 tag_type_size = TagTypeSize (tagType);
		
		if (tag_type_size == 0)
			{
			return false;
			}
			
		uint32 tag_data_size = tagCount * tag_type_size;
						
		if (tag_data_size > 4)
			{
			
			uint64 tagOffset = stream.Get_uint32 ();
							
			tagOffset += offsetDelta;
			
			if (tagOffset + tag_data_size > stream.Length ())
				{
				return false;
				}
			
			}
			
		}
		
	return true;
	
	}

void dng_info::ParseDNGPrivateData (dng_host &host,
									dng_stream &stream)
	{
	
	if (fShared->fDNGPrivateDataCount < 2)
		{
		return;
		}
	
	// DNG private data should always start with a null-terminated 
	// company name, to define the format of the private data.
			
	dng_string privateName;
			
		{
			
		char buffer [64];
		
		stream.SetReadPosition (fShared->fDNGPrivateDataOffset);
	
		uint32 readLength = Min_uint32 (fShared->fDNGPrivateDataCount,
										sizeof (buffer) - 1);
		
		stream.Get (buffer, readLength);
		
		buffer [readLength] = 0;
		
		privateName.Set (buffer);
		
		}
		
	// Pentax is storing their MakerNote in the DNGPrivateData data.
	
	if (privateName.StartsWith ("PENTAX" ) ||
		privateName.StartsWith ("SAMSUNG"))
		{
		
		#if qDNGValidate
		
		if (gVerbose)
			{
			printf ("Parsing Pentax/Samsung DNGPrivateData\n\n");
			}
			
		#endif

		stream.SetReadPosition (fShared->fDNGPrivateDataOffset + 8);
		
		bool bigEndian = stream.BigEndian ();
		
		uint16 endianMark = stream.Get_uint16 ();
		
		if (endianMark == byteOrderMM)
			{
			bigEndian = true;
			}
			
		else if (endianMark == byteOrderII)
			{
			bigEndian = false;
			}
			
		TempBigEndian temp_endian (stream, bigEndian);
	
		ParseMakerNoteIFD (host,
						   stream,
						   fShared->fDNGPrivateDataCount - 10,
						   fShared->fDNGPrivateDataOffset + 10,
						   fShared->fDNGPrivateDataOffset,
						   fShared->fDNGPrivateDataOffset,
						   fShared->fDNGPrivateDataOffset + fShared->fDNGPrivateDataCount,
						   tcPentaxMakerNote);
						   
		return;
		
		}
				
	// Stop parsing if this is not an Adobe format block.
	
	if (!privateName.Matches ("Adobe"))
		{
		return;
		}
	
	TempBigEndian temp_order (stream);
	
	uint32 section_offset = 6;
	
	while (section_offset + 8 < fShared->fDNGPrivateDataCount)
		{
		
		stream.SetReadPosition (fShared->fDNGPrivateDataOffset + section_offset);
		
		uint32 section_key   = stream.Get_uint32 ();
		uint32 section_count = stream.Get_uint32 ();
		
		if (section_key == DNG_CHAR4 ('M','a','k','N') && section_count > 6)
			{
			
			#if qDNGValidate
//.........这里部分代码省略.........