C++ dng_stream::Get_uint16方法代码示例

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 ();
	
	}

//.........这里部分代码省略.........
		
	// 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);
		
		bool bigEndian = false;
		
		uint16 endianMark = stream.Get_uint16 ();
		
		if (endianMark == byteOrderMM)
			{
			bigEndian = true;
			}
			
		else if (endianMark != byteOrderII)
			{
			return;
			}
			
		TempBigEndian temp_endian (stream, bigEndian);
		
		uint16 magic = stream.Get_uint16 ();
		
		if (magic != 42)
			{
			return;
			}
			
		uint32 ifd_offset = stream.Get_uint32 ();
		
		if (ifd_offset >= 8 && ifd_offset < makerNoteCount - 10)
			{
			
			ParseMakerNoteIFD (host,
							   stream,
							   makerNoteCount - 10 - ifd_offset,
							   makerNoteOffset + 10 + ifd_offset,
							   makerNoteOffset + 10,
							   minOffset,
							   maxOffset,

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::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::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.........

bool dng_camera_profile_info::ParseExtended (dng_stream &stream)
	{

	try
		{

		// Offsets are relative to the start of this structure, not the entire file.

		uint64 startPosition = stream.Position ();

		// Read header. Like a TIFF header, but with different magic number
		// Plus all offsets are relative to the start of the IFD, not to the
		// stream or file.

		uint16 byteOrder = stream.Get_uint16 ();

		if (byteOrder == byteOrderMM)
			fBigEndian = true;

		else if (byteOrder == byteOrderII)
			fBigEndian = false;

		else
			return false;

		TempBigEndian setEndianness (stream, fBigEndian);

		uint16 magicNumber = stream.Get_uint16 ();

		if (magicNumber != magicExtendedProfile)
			{
			return false;
			}

		uint32 offset = stream.Get_uint32 ();

		stream.Skip (offset - 8);

		// Start on IFD entries.

		uint32 ifdEntries = stream.Get_uint16 ();

		if (ifdEntries < 1)
			{
			return false;
			}

		for (uint32 tag_index = 0; tag_index < ifdEntries; tag_index++)
			{

			stream.SetReadPosition (startPosition + 8 + 2 + tag_index * 12);

			uint16 tagCode  = stream.Get_uint16 ();
			uint32 tagType  = stream.Get_uint16 ();
			uint32 tagCount = stream.Get_uint32 ();

			uint64 tagOffset = stream.Position ();

			if (TagTypeSize (tagType) * tagCount > 4)
				{

				tagOffset = startPosition + stream.Get_uint32 ();

				stream.SetReadPosition (tagOffset);

				}

			if (!ParseTag (stream,
						   0,
						   tagCode,
						   tagType,
						   tagCount,
						   tagOffset))
				{

				#if qDNGValidate

				if (gVerbose)
					{

					stream.SetReadPosition (tagOffset);

					printf ("*");

					DumpTagValues (stream,
								   LookupTagType (tagType),
								   0,
								   tagCode,
								   tagType,
								   tagCount);

					}

				#endif

				}

			}

		return true;
//.........这里部分代码省略.........

dng_opcode_MapTable::dng_opcode_MapTable (dng_host &host,
										  dng_stream &stream)

	:	dng_inplace_opcode (dngOpcode_MapTable,
							stream,
							"MapTable")

	,	fAreaSpec ()
	,	fTable    ()
	,	fCount    (0)

	{

	uint32 dataSize = stream.Get_uint32 ();

	fAreaSpec.GetData (stream);

	fCount = stream.Get_uint32 ();

	if (dataSize != dng_area_spec::kDataSize + 4 + fCount * 2)
		{
		ThrowBadFormat ();
		}

	if (fCount == 0 || fCount > 0x10000)
		{
		ThrowBadFormat ();
		}

	fTable.Reset (host.Allocate (0x10000 * sizeof (uint16)));

	uint16 *table = fTable->Buffer_uint16 ();

	for (uint32 index = 0; index < fCount; index++)
		{
		table [index] = stream.Get_uint16 ();
		}

	ReplicateLastEntry ();

	#if qDNGValidate

	if (gVerbose)
		{

		printf ("Count: %u\n", (unsigned) fCount);

		for (uint32 j = 0; j < fCount && j < gDumpLineLimit; j++)
			{
			printf ("    Table [%5u] = %5u\n", j, table [j]);
			}

		if (fCount > gDumpLineLimit)
			{
			printf ("    ... %u table entries skipped\n", fCount - gDumpLineLimit);
			}

		}

	#endif

	}