private static void printField(Stream fd, TiffFieldInfo fip, int value_count, object raw_data)
{
fprintf(fd, " {0}: ", fip.Name);
byte[] bytes = raw_data as byte[];
sbyte[] sbytes = raw_data as sbyte[];
short[] shorts = raw_data as short[];
ushort[] ushorts = raw_data as ushort[];
int[] ints = raw_data as int[];
uint[] uints = raw_data as uint[];
float[] floats = raw_data as float[];
double[] doubles = raw_data as double[];
string s = raw_data as string;
for (int j = 0; j < value_count; j++)
{
if (fip.Type == TiffType.Byte || fip.Type == TiffType.SByte)
{
if (bytes != null)
fprintf(fd, "{0}", bytes[j]);
else if (sbytes != null)
fprintf(fd, "{0}", sbytes[j]);
}
else if (fip.Type == TiffType.Undefined)
{
if (bytes != null)
fprintf(fd, "0x{0:x}", bytes[j]);
}
else if (fip.Type == TiffType.Short || fip.Type == TiffType.SShort)
{
if (shorts != null)
fprintf(fd, "{0}", shorts[j]);
else if (ushorts != null)
fprintf(fd, "{0}", ushorts[j]);
}
else if (fip.Type == TiffType.Long || fip.Type == TiffType.SLong)
{
if (ints != null)
fprintf(fd, "{0}", ints[j]);
else if (uints != null)
fprintf(fd, "{0}", uints[j]);
}
else if (fip.Type == TiffType.Rational ||
fip.Type == TiffType.SRational ||
fip.Type == TiffType.Float)
{
if (floats != null)
fprintf(fd, "{0}", floats[j]);
}
else if (fip.Type == TiffType.IFD)
{
if (ints != null)
fprintf(fd, "0x{0:x}", ints[j]);
else if (uints != null)
fprintf(fd, "0x{0:x}", uints[j]);
}
else if (fip.Type == TiffType.ASCII)
{
if (s != null)
fprintf(fd, "{0}", s);
break;
}
else if (fip.Type == TiffType.Double || fip.Type == TiffType.Float)
{
if (floats != null)
fprintf(fd, "{0}", floats[j]);
else if (doubles != null)
fprintf(fd, "{0}", doubles[j]);
}
else
{
fprintf(fd, "<unsupported data type in printField>");
break;
}
if (j < value_count - 1)
fprintf(fd, ",");
}
fprintf(fd, "\r\n");
}
/// <summary>
/// Reads the contents of the next TIFF directory in an open TIFF file/stream and makes
/// it the current directory.
/// </summary>
/// <returns><c>true</c> if directory was successfully read; otherwise, <c>false</c> if an
/// error was encountered, or if there are no more directories to be read.</returns>
/// <remarks><para>Directories are read sequentially.</para>
/// <para>Applications only need to call <see cref="ReadDirectory"/> to read multiple
/// subfiles in a single TIFF file/stream - the first directory in a file/stream is
/// automatically read when <see cref="Open"/> or <see cref="ClientOpen"/> is called.
/// </para><para>
/// The images that have a single uncompressed strip or tile of data are automatically
/// treated as if they were made up of multiple strips or tiles of approximately 8
/// kilobytes each. This operation is done only in-memory; it does not alter the contents
/// of the file/stream. However, the construction of the "chopped strips" is visible to
/// the application through the number of strips returned by <see cref="NumberOfStrips"/>
/// or the number of tiles returned by <see cref="NumberOfTiles"/>.</para>
/// </remarks>
public bool ReadDirectory()
{
const string module = "ReadDirectory";
m_diroff = m_nextdiroff;
if (m_diroff == 0)
{
// no more directories
return false;
}
// Check whether we have the last offset or bad offset (IFD looping).
if (!checkDirOffset(m_nextdiroff))
return false;
// Cleanup any previous compression state.
m_currentCodec.Cleanup();
m_curdir++;
TiffDirEntry[] dir;
short dircount = fetchDirectory(m_nextdiroff, out dir, out m_nextdiroff);
if (dircount == 0)
{
ErrorExt(this, m_clientdata, module, "{0}: Failed to read directory at offset {1}", m_name, m_nextdiroff);
return false;
}
// reset before new dir
m_flags &= ~TiffFlags.BeenWriting;
// Setup default value and then make a pass over the fields to check type and tag
// information, and to extract info required to size data structures. A second pass is
// made afterwards to read in everthing not taken in the first pass.
// free any old stuff and reinit
FreeDirectory();
setupDefaultDirectory();
// Electronic Arts writes gray-scale TIFF files without a PlanarConfiguration
// directory entry. Thus we setup a default value here, even though the TIFF spec says
// there is no default value.
SetField(TiffTag.PlanarConfig, PlanarConfig.Contig);
// Sigh, we must make a separate pass through the directory for the following reason:
//
// We must process the Compression tag in the first pass in order to merge in
// codec-private tag definitions (otherwise we may get complaints about unknown tags).
// However, the Compression tag may be dependent on the SamplesPerPixel tag value
// because older TIFF specs permited Compression to be written as a
// SamplesPerPixel-count tag entry. Thus if we don't first figure out the correct
// SamplesPerPixel tag value then we may end up ignoring the Compression tag value
// because it has an incorrect count value (if the true value of SamplesPerPixel is not 1).
//
// It sure would have been nice if Aldus had really thought this stuff through carefully.
for (int i = 0; i < dircount; i++)
{
TiffDirEntry dp = dir[i];
if ((m_flags & TiffFlags.Swab) == TiffFlags.Swab)
{
short temp = (short)dp.tdir_tag;
SwabShort(ref temp);
dp.tdir_tag = (TiffTag)(ushort)temp;
temp = (short)dp.tdir_type;
SwabShort(ref temp);
dp.tdir_type = (TiffType)temp;
SwabLong(ref dp.tdir_count);
SwabUInt(ref dp.tdir_offset);
}
if (dp.tdir_tag == TiffTag.SamplesPerPixel)
{
if (!fetchNormalTag(dir[i]))
return false;
dp.tdir_tag = TiffTag.Ignore;
}
}
// First real pass over the directory.
int fix = 0;
bool diroutoforderwarning = false;
bool haveunknowntags = false;
for (int i = 0; i < dircount; i++)
{
if (dir[i].tdir_tag == TiffTag.Ignore)
continue;
if (fix >= m_nfields)
fix = 0;
// Silicon Beach (at least) writes unordered directory tags (violating the spec).
// Handle it here, but be obnoxious (maybe they'll fix it?).
if (dir[i].tdir_tag < m_fieldinfo[fix].Tag)
{
if (!diroutoforderwarning)
{
WarningExt(this, m_clientdata, module,
"{0}: invalid TIFF directory; tags are not sorted in ascending order", m_name);
diroutoforderwarning = true;
}
fix = 0; // O(n^2)
}
while (fix < m_nfields && m_fieldinfo[fix].Tag < dir[i].tdir_tag)
fix++;
if (fix >= m_nfields || m_fieldinfo[fix].Tag != dir[i].tdir_tag)
{
// Unknown tag ... we'll deal with it below
haveunknowntags = true;
continue;
}
// null out old tags that we ignore.
if (m_fieldinfo[fix].Bit == FieldBit.Ignore)
{
dir[i].tdir_tag = TiffTag.Ignore;
continue;
}
// Check data type.
TiffFieldInfo fip = m_fieldinfo[fix];
while (dir[i].tdir_type != fip.Type && fix < m_nfields)
{
if (fip.Type == TiffType.Any)
{
// wildcard
break;
}
fip = m_fieldinfo[++fix];
if (fix >= m_nfields || fip.Tag != dir[i].tdir_tag)
{
WarningExt(this, m_clientdata, module,
"{0}: wrong data type {1} for \"{2}\"; tag ignored",
m_name, dir[i].tdir_type, m_fieldinfo[fix - 1].Name);
dir[i].tdir_tag = TiffTag.Ignore;
continue;
}
}
// Check count if known in advance.
if (fip.ReadCount != TiffFieldInfo.Variable &&
fip.ReadCount != TiffFieldInfo.Variable2)
{
int expected = fip.ReadCount;
if (fip.ReadCount == TiffFieldInfo.Spp)
expected = m_dir.td_samplesperpixel;
if (!checkDirCount(dir[i], expected))
{
dir[i].tdir_tag = TiffTag.Ignore;
continue;
}
}
switch (dir[i].tdir_tag)
{
case TiffTag.Compression:
// The 5.0 spec says the Compression tag has one value,
// while earlier specs say it has one value per sample.
// Because of this, we accept the tag if one value is supplied.
if (dir[i].tdir_count == 1)
{
int v = extractData(dir[i]);
if (!SetField(dir[i].tdir_tag, v))
return false;
break;
// XXX: workaround for broken TIFFs
}
else if (dir[i].tdir_type == TiffType.Long)
{
int v;
if (!fetchPerSampleLongs(dir[i], out v) || !SetField(dir[i].tdir_tag, v))
return false;
}
else
{
short iv;
if (!fetchPerSampleShorts(dir[i], out iv) || !SetField(dir[i].tdir_tag, iv))
return false;
}
dir[i].tdir_tag = TiffTag.Ignore;
break;
case TiffTag.StripOffsets:
case TiffTag.StripByteCounts:
case TiffTag.TileOffsets:
case TiffTag.TileByteCounts:
setFieldBit(fip.Bit);
break;
case TiffTag.ImageWidth:
case TiffTag.ImageLength:
case TiffTag.IMAGEDEPTH:
case TiffTag.TileLength:
case TiffTag.TileWidth:
case TiffTag.TILEDEPTH:
case TiffTag.PlanarConfig:
case TiffTag.RowsPerStrip:
case TiffTag.ExtraSamples:
if (!fetchNormalTag(dir[i]))
return false;
dir[i].tdir_tag = TiffTag.Ignore;
break;
}
}
// If we saw any unknown tags, make an extra pass over the directory to deal with
// them. This must be done separately because the tags could have become known when we
// registered a codec after finding the Compression tag. In a correctly-sorted
// directory there's no problem because Compression will come before any codec-private
// tags, but if the sorting is wrong that might not hold.
if (haveunknowntags)
{
fix = 0;
for (int i = 0; i < dircount; i++)
{
if (dir[i].tdir_tag == TiffTag.Ignore)
continue;
if (fix >= m_nfields || dir[i].tdir_tag < m_fieldinfo[fix].Tag)
{
// O(n^2)
fix = 0;
}
while (fix < m_nfields && m_fieldinfo[fix].Tag < dir[i].tdir_tag)
fix++;
if (fix >= m_nfields || m_fieldinfo[fix].Tag != dir[i].tdir_tag)
{
Tiff.WarningExt(this, m_clientdata, module,
"{0}: unknown field with tag {1} (0x{2:x}) encountered",
m_name, (ushort)dir[i].tdir_tag, (ushort)dir[i].tdir_tag);
TiffFieldInfo[] arr = new TiffFieldInfo[1];
arr[0] = createAnonFieldInfo(dir[i].tdir_tag, dir[i].tdir_type);
MergeFieldInfo(arr, 1);
fix = 0;
while (fix < m_nfields && m_fieldinfo[fix].Tag < dir[i].tdir_tag)
fix++;
}
// Check data type.
TiffFieldInfo fip = m_fieldinfo[fix];
while (dir[i].tdir_type != fip.Type && fix < m_nfields)
{
if (fip.Type == TiffType.Any)
{
// wildcard
break;
}
fip = m_fieldinfo[++fix];
if (fix >= m_nfields || fip.Tag != dir[i].tdir_tag)
{
Tiff.WarningExt(this, m_clientdata, module,
"{0}: wrong data type {1} for \"{2}\"; tag ignored",
m_name, dir[i].tdir_type, m_fieldinfo[fix - 1].Name);
dir[i].tdir_tag = TiffTag.Ignore;
break;
}
}
}
}
// XXX: OJPEG hack.
// If a) compression is OJPEG, b) planarconfig tag says it's separate, c) strip
// offsets/bytecounts tag are both present and d) both contain exactly one value, then
// we consistently find that the buggy implementation of the buggy compression scheme
// matches contig planarconfig best. So we 'fix-up' the tag here
if ((m_dir.td_compression == Compression.OJPEG) && (m_dir.td_planarconfig == PlanarConfig.Separate))
{
int dpIndex = readDirectoryFind(dir, dircount, TiffTag.StripOffsets);
if (dpIndex != -1 && dir[dpIndex].tdir_count == 1)
{
dpIndex = readDirectoryFind(dir, dircount, TiffTag.StripByteCounts);
if (dpIndex != -1 && dir[dpIndex].tdir_count == 1)
{
m_dir.td_planarconfig = PlanarConfig.Contig;
WarningExt(this, m_clientdata, "ReadDirectory",
"Planarconfig tag value assumed incorrect, assuming data is contig instead of chunky");
}
}
}
// Allocate directory structure and setup defaults.
if (!fieldSet(FieldBit.ImageDimensions))
{
missingRequired("ImageLength");
return false;
}
// Setup appropriate structures (by strip or by tile)
if (!fieldSet(FieldBit.TileDimensions))
{
m_dir.td_nstrips = NumberOfStrips();
m_dir.td_tilewidth = m_dir.td_imagewidth;
m_dir.td_tilelength = m_dir.td_rowsperstrip;
m_dir.td_tiledepth = m_dir.td_imagedepth;
m_flags &= ~TiffFlags.IsTiled;
}
else
{
m_dir.td_nstrips = NumberOfTiles();
m_flags |= TiffFlags.IsTiled;
}
if (m_dir.td_nstrips == 0)
{
ErrorExt(this, m_clientdata, module,
"{0}: cannot handle zero number of {1}", m_name, IsTiled() ? "tiles" : "strips");
return false;
}
m_dir.td_stripsperimage = m_dir.td_nstrips;
if (m_dir.td_planarconfig == PlanarConfig.Separate)
m_dir.td_stripsperimage /= m_dir.td_samplesperpixel;
if (!fieldSet(FieldBit.StripOffsets))
{
if ((m_dir.td_compression == Compression.OJPEG) && !IsTiled() && (m_dir.td_nstrips == 1))
{
// XXX: OJPEG hack.
// If a) compression is OJPEG, b) it's not a tiled TIFF, and c) the number of
// strips is 1, then we tolerate the absence of stripoffsets tag, because,
// presumably, all required data is in the JpegInterchangeFormat stream.
setFieldBit(FieldBit.StripOffsets);
}
else
{
missingRequired(IsTiled() ? "TileOffsets" : "StripOffsets");
return false;
}
}
// Second pass: extract other information.
for (int i = 0; i < dircount; i++)
{
if (dir[i].tdir_tag == TiffTag.Ignore)
continue;
switch (dir[i].tdir_tag)
{
case TiffTag.MinSampleValue:
case TiffTag.MaxSampleValue:
case TiffTag.BitsPerSample:
case TiffTag.DATATYPE:
case TiffTag.SampleFormat:
// The 5.0 spec says the Compression tag has one value, while earlier
// specs say it has one value per sample. Because of this, we accept the
// tag if one value is supplied.
//
// The MinSampleValue, MaxSampleValue, BitsPerSample DataType and
// SampleFormat tags are supposed to be written as one value/sample, but
// some vendors incorrectly write one value only - so we accept that as
// well (yech). Other vendors write correct value for NumberOfSamples, but
// incorrect one for BitsPerSample and friends, and we will read this too.
if (dir[i].tdir_count == 1)
{
int v = extractData(dir[i]);
if (!SetField(dir[i].tdir_tag, v))
return false;
// XXX: workaround for broken TIFFs
}
else if (dir[i].tdir_tag == TiffTag.BitsPerSample && dir[i].tdir_type == TiffType.Long)
{
int v;
if (!fetchPerSampleLongs(dir[i], out v) || !SetField(dir[i].tdir_tag, v))
return false;
}
else
{
short iv;
if (!fetchPerSampleShorts(dir[i], out iv) || !SetField(dir[i].tdir_tag, iv))
return false;
}
break;
case TiffTag.SMinSampleValue:
case TiffTag.SMaxSampleValue:
double dv;
if (!fetchPerSampleAnys(dir[i], out dv) || !SetField(dir[i].tdir_tag, dv))
return false;
break;
case TiffTag.StripOffsets:
case TiffTag.TileOffsets:
if (!fetchStripThing(dir[i], m_dir.td_nstrips, ref m_dir.td_stripoffset))
return false;
break;
case TiffTag.StripByteCounts:
case TiffTag.TileByteCounts:
if (!fetchStripThing(dir[i], m_dir.td_nstrips, ref m_dir.td_stripbytecount))
return false;
break;
case TiffTag.Colormap:
case TiffTag.TransferFunction:
{
// TransferFunction can have either 1x or 3x data values;
// Colormap can have only 3x items.
int v = 1 << m_dir.td_bitspersample;
if (dir[i].tdir_tag == TiffTag.Colormap || dir[i].tdir_count != v)
{
if (!checkDirCount(dir[i], 3 * v))
break;
}
byte[] cp = new byte[dir[i].tdir_count * sizeof(short)];
if (fetchData(dir[i], cp) != 0)
{
int c = 1 << m_dir.td_bitspersample;
if (dir[i].tdir_count == c)
{
// This deals with there being only one array to apply to all samples.
short[] u = ByteArrayToShorts(cp, 0, dir[i].tdir_count * sizeof(short));
SetField(dir[i].tdir_tag, u, u, u);
}
else
{
v *= sizeof(short);
short[] u0 = ByteArrayToShorts(cp, 0, v);
short[] u1 = ByteArrayToShorts(cp, v, v);
short[] u2 = ByteArrayToShorts(cp, 2 * v, v);
SetField(dir[i].tdir_tag, u0, u1, u2);
}
}
break;
}
case TiffTag.PageNumber:
case TiffTag.HalfToneHints:
case TiffTag.YCBCRSUBSAMPLING:
case TiffTag.DotRange:
fetchShortPair(dir[i]);
break;
case TiffTag.REFERENCEBLACKWHITE:
fetchRefBlackWhite(dir[i]);
break;
// BEGIN REV 4.0 COMPATIBILITY
case TiffTag.OSubFileType:
FileType ft = 0;
switch ((SubFileType)extractData(dir[i]))
{
case SubFileType.ReducedSizeImage:
ft = FileType.ReducedResImage;
break;
case SubFileType.Page:
ft = FileType.Page;
break;
}
if (ft != 0)
SetField(TiffTag.SubFileType, ft);
break;
// END REV 4.0 COMPATIBILITY
default:
fetchNormalTag(dir[i]);
break;
}
}
// OJPEG hack:
// - If a) compression is OJPEG, and b) photometric tag is missing, then we
// consistently find that photometric should be YCbCr
// - If a) compression is OJPEG, and b) photometric tag says it's RGB, then we
// consistently find that the buggy implementation of the buggy compression scheme
// matches photometric YCbCr instead.
// - If a) compression is OJPEG, and b) bitspersample tag is missing, then we
// consistently find bitspersample should be 8.
// - If a) compression is OJPEG, b) samplesperpixel tag is missing, and c) photometric
// is RGB or YCbCr, then we consistently find samplesperpixel should be 3
// - If a) compression is OJPEG, b) samplesperpixel tag is missing, and c) photometric
// is MinIsWhite or MinIsBlack, then we consistently find samplesperpixel should be 3
if (m_dir.td_compression == Compression.OJPEG)
{
if (!fieldSet(FieldBit.Photometric))
{
WarningExt(this, m_clientdata,
"ReadDirectory", "Photometric tag is missing, assuming data is YCbCr");
if (!SetField(TiffTag.Photometric, Photometric.YCBCR))
return false;
}
else if (m_dir.td_photometric == Photometric.RGB)
{
m_dir.td_photometric = Photometric.YCBCR;
WarningExt(this, m_clientdata, "ReadDirectory",
"Photometric tag value assumed incorrect, assuming data is YCbCr instead of RGB");
}
if (!fieldSet(FieldBit.BitsPerSample))
{
WarningExt(this, m_clientdata, "ReadDirectory",
"BitsPerSample tag is missing, assuming 8 bits per sample");
if (!SetField(TiffTag.BitsPerSample, 8))
return false;
}
if (!fieldSet(FieldBit.SamplesPerPixel))
{
if ((m_dir.td_photometric == Photometric.RGB) ||
(m_dir.td_photometric == Photometric.YCBCR))
{
WarningExt(this, m_clientdata, "ReadDirectory",
"SamplesPerPixel tag is missing, assuming correct SamplesPerPixel value is 3");
if (!SetField(TiffTag.SamplesPerPixel, 3))
return false;
}
else if ((m_dir.td_photometric == Photometric.MinIsWhite) ||
(m_dir.td_photometric == Photometric.MinIsBlack))
{
WarningExt(this, m_clientdata, "ReadDirectory",
"SamplesPerPixel tag is missing, assuming correct SamplesPerPixel value is 1");
if (!SetField(TiffTag.SamplesPerPixel, 1))
return false;
}
}
}
// Verify Palette image has a Colormap.
if (m_dir.td_photometric == Photometric.Palette && !fieldSet(FieldBit.ColorMap))
{
missingRequired("Colormap");
return false;
}
// OJPEG hack:
// We do no further messing with strip/tile offsets/bytecounts in OJPEG TIFFs
if (m_dir.td_compression != Compression.OJPEG)
{
// Attempt to deal with a missing StripByteCounts tag.
if (!fieldSet(FieldBit.StripByteCounts))
{
// Some manufacturers violate the spec by not giving the size of the strips.
// In this case, assume there is one uncompressed strip of data.
if ((m_dir.td_planarconfig == PlanarConfig.Contig && m_dir.td_nstrips > 1) ||
(m_dir.td_planarconfig == PlanarConfig.Separate && m_dir.td_nstrips != m_dir.td_samplesperpixel))
{
missingRequired("StripByteCounts");
return false;
}
WarningExt(this, m_clientdata, module,
"{0}: TIFF directory is missing required \"{1}\" field, calculating from imagelength",
m_name, FieldWithTag(TiffTag.StripByteCounts).Name);
if (!estimateStripByteCounts(dir, dircount))
return false;
}
else if (m_dir.td_nstrips == 1 && m_dir.td_stripoffset[0] != 0 && byteCountLooksBad(m_dir))
{
// XXX: Plexus (and others) sometimes give a value of zero for a tag when
// they don't know what the correct value is! Try and handle the simple case
// of estimating the size of a one strip image.
WarningExt(this, m_clientdata, module,
"{0}: Bogus \"{1}\" field, ignoring and calculating from imagelength",
m_name, FieldWithTag(TiffTag.StripByteCounts).Name);
if (!estimateStripByteCounts(dir, dircount))
return false;
}
else if (m_dir.td_planarconfig == PlanarConfig.Contig && m_dir.td_nstrips > 2 &&
m_dir.td_compression == Compression.None &&
m_dir.td_stripbytecount[0] != m_dir.td_stripbytecount[1])
{
// XXX: Some vendors fill StripByteCount array with absolutely wrong values
// (it can be equal to StripOffset array, for example). Catch this case here.
WarningExt(this, m_clientdata, module,
"{0}: Wrong \"{1}\" field, ignoring and calculating from imagelength",
m_name, FieldWithTag(TiffTag.StripByteCounts).Name);
if (!estimateStripByteCounts(dir, dircount))
return false;
}
}
dir = null;
if (!fieldSet(FieldBit.MaxSampleValue))
m_dir.td_maxsamplevalue = (short)((1 << m_dir.td_bitspersample) - 1);
// Setup default compression scheme.
// XXX: We can optimize checking for the strip bounds using the sorted bytecounts
// array. See also comments for appendToStrip() function.
if (m_dir.td_nstrips > 1)
{
m_dir.td_stripbytecountsorted = true;
for (int strip = 1; strip < m_dir.td_nstrips; strip++)
{
if (m_dir.td_stripoffset[strip - 1] > m_dir.td_stripoffset[strip])
{
m_dir.td_stripbytecountsorted = false;
break;
}
}
}
if (!fieldSet(FieldBit.Compression))
SetField(TiffTag.Compression, Compression.None);
// Some manufacturers make life difficult by writing large amounts of uncompressed
// data as a single strip. This is contrary to the recommendations of the spec. The
// following makes an attempt at breaking such images into strips closer to the
// recommended 8k bytes. A side effect, however, is that the RowsPerStrip tag value
// may be changed.
if (m_dir.td_nstrips == 1 && m_dir.td_compression == Compression.None &&
(m_flags & TiffFlags.StripChop) == TiffFlags.StripChop &&
(m_flags & TiffFlags.IsTiled) != TiffFlags.IsTiled)
{
chopUpSingleUncompressedStrip();
}
// Reinitialize i/o since we are starting on a new directory.
m_row = -1;
m_curstrip = -1;
m_col = -1;
m_curtile = -1;
m_tilesize = -1;
m_scanlinesize = ScanlineSize();
if (m_scanlinesize == 0)
{
ErrorExt(this, m_clientdata, module, "{0}: cannot handle zero scanline size", m_name);
return false;
}
if (IsTiled())
{
m_tilesize = TileSize();
if (m_tilesize == 0)
{
ErrorExt(this, m_clientdata, module, "{0}: cannot handle zero tile size", m_name);
return false;
}
}
else
{
if (StripSize() == 0)
{
ErrorExt(this, m_clientdata, module, "{0}: cannot handle zero strip size", m_name);
return false;
}
}
return true;
}
/// <summary>
/// Reads a custom directory from the arbitrary offset within file/stream.
/// </summary>
/// <param name="offset">The directory offset.</param>
/// <param name="info">The array of <see cref="TiffFieldInfo"/> objects to merge to
/// existing field information.</param>
/// <param name="count">The number of items to use from
/// the <paramref name="info"/> array.</param>
/// <returns><c>true</c> if a custom directory was read successfully;
/// otherwise, <c>false</c></returns>
public bool ReadCustomDirectory(long offset, TiffFieldInfo[] info, int count)
{
const string module = "ReadCustomDirectory";
setupFieldInfo(info, count);
uint dummyNextDirOff;
TiffDirEntry[] dir;
short dircount = fetchDirectory((uint)offset, out dir, out dummyNextDirOff);
if (dircount == 0)
{
ErrorExt(this, m_clientdata, module,
"{0}: Failed to read custom directory at offset {1}", m_name, offset);
return false;
}
FreeDirectory();
m_dir = new TiffDirectory();
int fix = 0;
for (short i = 0; i < dircount; i++)
{
if ((m_flags & TiffFlags.Swab) == TiffFlags.Swab)
{
short temp = (short)dir[i].tdir_tag;
SwabShort(ref temp);
dir[i].tdir_tag = (TiffTag)(ushort)temp;
temp = (short)dir[i].tdir_type;
SwabShort(ref temp);
dir[i].tdir_type = (TiffType)temp;
SwabLong(ref dir[i].tdir_count);
SwabUInt(ref dir[i].tdir_offset);
}
if (fix >= m_nfields || dir[i].tdir_tag == TiffTag.Ignore)
continue;
while (fix < m_nfields && m_fieldinfo[fix].Tag < dir[i].tdir_tag)
fix++;
if (fix >= m_nfields || m_fieldinfo[fix].Tag != dir[i].tdir_tag)
{
WarningExt(this, m_clientdata, module,
"{0}: unknown field with tag {1} (0x{2:x}) encountered",
m_name, (ushort)dir[i].tdir_tag, (ushort)dir[i].tdir_tag);
TiffFieldInfo[] arr = new TiffFieldInfo[1];
arr[0] = createAnonFieldInfo(dir[i].tdir_tag, dir[i].tdir_type);
MergeFieldInfo(arr, 1);
fix = 0;
while (fix < m_nfields && m_fieldinfo[fix].Tag < dir[i].tdir_tag)
fix++;
}
// null out old tags that we ignore.
if (m_fieldinfo[fix].Bit == FieldBit.Ignore)
{
dir[i].tdir_tag = TiffTag.Ignore;
continue;
}
// Check data type.
TiffFieldInfo fip = m_fieldinfo[fix];
while (dir[i].tdir_type != fip.Type && fix < m_nfields)
{
if (fip.Type == TiffType.Any)
{
// wildcard
break;
}
fip = m_fieldinfo[++fix];
if (fix >= m_nfields || fip.Tag != dir[i].tdir_tag)
{
WarningExt(this, m_clientdata, module,
"{0}: wrong data type {1} for \"{2}\"; tag ignored",
m_name, dir[i].tdir_type, m_fieldinfo[fix - 1].Name);
dir[i].tdir_tag = TiffTag.Ignore;
continue;
}
}
// Check count if known in advance.
if (fip.ReadCount != TiffFieldInfo.Variable &&
fip.ReadCount != TiffFieldInfo.Variable2)
{
int expected = fip.ReadCount;
if (fip.ReadCount == TiffFieldInfo.Spp)
expected = m_dir.td_samplesperpixel;
if (!checkDirCount(dir[i], expected))
{
dir[i].tdir_tag = TiffTag.Ignore;
continue;
}
}
// EXIF tags which need to be specifically processed.
switch (dir[i].tdir_tag)
{
case TiffTag.EXIF_SUBJECTDISTANCE:
fetchSubjectDistance(dir[i]);
break;
default:
fetchNormalTag(dir[i]);
break;
}
}
return true;
}
/// <summary>
/// Merges given field information to existing one.
/// </summary>
/// <param name="info">The array of <see cref="TiffFieldInfo"/> objects.</param>
/// <param name="count">The number of items to use from the <paramref name="info"/> array.</param>
public void MergeFieldInfo(TiffFieldInfo[] info, int count)
{
m_foundfield = null;
if (m_nfields > 0)
m_fieldinfo = Realloc(m_fieldinfo, m_nfields, m_nfields + count);
else
m_fieldinfo = new TiffFieldInfo[count];
for (int i = 0; i < count; i++)
{
TiffFieldInfo fip = FindFieldInfo(info[i].Tag, info[i].Type);
// only add definitions that aren't already present
if (fip == null)
{
m_fieldinfo[m_nfields] = info[i];
m_nfields++;
}
}
// Sort the field info by tag number
IComparer myComparer = new TagCompare();
Array.Sort(m_fieldinfo, 0, m_nfields, myComparer);
}
/// <summary>
/// Retrieves field information for the tag with specified name.
/// </summary>
/// <param name="name">The name of the tag to retrieve field information for.</param>
/// <param name="type">The tiff data type to use us additional filter.</param>
/// <returns>The field information for specified tag with specified type or <c>null</c> if
/// the field information wasn't found.</returns>
public TiffFieldInfo FindFieldInfoByName(string name, TiffType type)
{
if (m_foundfield != null && m_foundfield.Name == name &&
(type == TiffType.Any || type == m_foundfield.Type))
{
return m_foundfield;
}
// If we are invoked with no field information, then just return.
if (m_fieldinfo == null)
return null;
m_foundfield = null;
foreach (TiffFieldInfo info in m_fieldinfo)
{
if (info != null && info.Name == name &&
(type == TiffType.Any || type == info.Type))
{
m_foundfield = info;
break;
}
}
return m_foundfield;
}
/*
* Setup a default directory structure.
*/
private void setupDefaultDirectory()
{
int tiffFieldInfoCount;
TiffFieldInfo[] tiffFieldInfo = getFieldInfo(out tiffFieldInfoCount);
setupFieldInfo(tiffFieldInfo, tiffFieldInfoCount);
m_dir = new TiffDirectory();
m_postDecodeMethod = PostDecodeMethodType.pdmNone;
m_foundfield = null;
m_tagmethods = m_defaultTagMethods;
/*
* Give client code a chance to install their own
* tag extensions & methods, prior to compression overloads.
*/
if (m_extender != null)
m_extender(this);
SetField(TiffTag.Compression, Compression.None);
/*
* NB: The directory is marked dirty as a result of setting
* up the default compression scheme. However, this really
* isn't correct -- we want DirtyDirect to be set only
* if the user does something. We could just do the setup
* by hand, but it seems better to use the normal mechanism
* (i.e. SetField).
*/
m_flags &= ~TiffFlags.DirtyDirect;
/*
* we clear the IsTiled flag when setting up a new directory.
* Should we also be clearing stuff like InSubIFD?
*/
m_flags &= ~TiffFlags.IsTiled;
/*
* Clear other directory-specific fields.
*/
m_tilesize = -1;
m_scanlinesize = -1;
}
private static TiffFieldInfo createAnonFieldInfo(TiffTag tag, TiffType field_type)
{
TiffFieldInfo fld = new TiffFieldInfo(tag, TiffFieldInfo.Variable2,
TiffFieldInfo.Variable2, field_type, FieldBit.Custom, true, true, null);
// note that this name is a special sign to Close() and
// setupFieldInfo() to free the field
fld.Name = string.Format(CultureInfo.InvariantCulture, "Tag {0}", tag);
return fld;
}
private void setupFieldInfo(TiffFieldInfo[] info, int n)
{
m_nfields = 0;
MergeFieldInfo(info, n);
}
/// <summary>
/// Writes tags that are not special cased.
/// </summary>
private bool writeNormalTag(ref TiffDirEntry dir, TiffFieldInfo fip)
{
short wc = fip.WriteCount;
dir.tdir_tag = fip.Tag;
dir.tdir_type = fip.Type;
dir.tdir_count = wc;
switch (fip.Type)
{
case TiffType.Short:
case TiffType.SShort:
if (fip.PassCount)
{
short[] wp;
int wc2;
if (wc == TiffFieldInfo.Variable2)
{
FieldValue[] result = GetField(fip.Tag);
wc2 = result[0].ToInt();
wp = result[1].ToShortArray();
dir.tdir_count = wc2;
}
else
{
// Assume TiffFieldInfo.Variable
FieldValue[] result = GetField(fip.Tag);
wc = result[0].ToShort();
wp = result[1].ToShortArray();
dir.tdir_count = wc;
}
if (!writeShortArray(ref dir, wp))
return false;
}
else
{
if (wc == 1)
{
FieldValue[] result = GetField(fip.Tag);
short sv = result[0].ToShort();
dir.tdir_offset = insertData(dir.tdir_type, sv);
}
else
{
FieldValue[] result = GetField(fip.Tag);
short[] wp = result[0].ToShortArray();
if (!writeShortArray(ref dir, wp))
return false;
}
}
break;
case TiffType.Long:
case TiffType.SLong:
case TiffType.IFD:
if (fip.PassCount)
{
int[] lp;
int wc2;
if (wc == TiffFieldInfo.Variable2)
{
FieldValue[] result = GetField(fip.Tag);
wc2 = result[0].ToInt();
lp = result[1].ToIntArray();
dir.tdir_count = wc2;
}
else
{
// Assume TiffFieldInfo.Variable
FieldValue[] result = GetField(fip.Tag);
wc = result[0].ToShort();
lp = result[1].ToIntArray();
dir.tdir_count = wc;
}
if (!writeLongArray(ref dir, lp))
return false;
}
else
{
if (wc == 1)
{
// XXX handle Long->Short conversion
FieldValue[] result = GetField(fip.Tag);
dir.tdir_offset = result[0].ToUInt();
}
else
{
int[] lp;
FieldValue[] result = GetField(fip.Tag);
lp = result[0].ToIntArray();
if (!writeLongArray(ref dir, lp))
return false;
}
}
break;
case TiffType.Rational:
case TiffType.SRational:
if (fip.PassCount)
{
float[] fp;
int wc2;
if (wc == TiffFieldInfo.Variable2)
{
FieldValue[] result = GetField(fip.Tag);
wc2 = result[0].ToInt();
fp = result[1].ToFloatArray();
dir.tdir_count = wc2;
}
else
{
// Assume TiffFieldInfo.Variable
FieldValue[] result = GetField(fip.Tag);
wc = result[0].ToShort();
fp = result[1].ToFloatArray();
dir.tdir_count = wc;
}
if (!writeRationalArray(ref dir, fp))
return false;
}
else
{
if (wc == 1)
{
float[] fv = new float[1];
FieldValue[] result = GetField(fip.Tag);
fv[0] = result[0].ToFloat();
if (!writeRationalArray(ref dir, fv))
return false;
}
else
{
FieldValue[] result = GetField(fip.Tag);
float[] fp = result[0].ToFloatArray();
if (!writeRationalArray(ref dir, fp))
return false;
}
}
break;
case TiffType.Float:
if (fip.PassCount)
{
float[] fp;
int wc2;
if (wc == TiffFieldInfo.Variable2)
{
FieldValue[] result = GetField(fip.Tag);
wc2 = result[0].ToInt();
fp = result[1].ToFloatArray();
dir.tdir_count = wc2;
}
else
{
// Assume TiffFieldInfo.Variable
FieldValue[] result = GetField(fip.Tag);
wc = result[0].ToShort();
fp = result[1].ToFloatArray();
dir.tdir_count = wc;
}
if (!writeFloatArray(ref dir, fp))
return false;
}
else
{
if (wc == 1)
{
float[] fv = new float[1];
FieldValue[] result = GetField(fip.Tag);
fv[0] = result[0].ToFloat();
if (!writeFloatArray(ref dir, fv))
return false;
}
else
{
FieldValue[] result = GetField(fip.Tag);
float[] fp = result[0].ToFloatArray();
if (!writeFloatArray(ref dir, fp))
return false;
}
}
break;
case TiffType.Double:
if (fip.PassCount)
{
double[] dp;
int wc2;
if (wc == TiffFieldInfo.Variable2)
{
FieldValue[] result = GetField(fip.Tag);
wc2 = result[0].ToInt();
dp = result[1].ToDoubleArray();
dir.tdir_count = wc2;
}
else
{
// Assume TiffFieldInfo.Variable
FieldValue[] result = GetField(fip.Tag);
wc = result[0].ToShort();
dp = result[1].ToDoubleArray();
dir.tdir_count = wc;
}
if (!writeDoubleArray(ref dir, dp))
return false;
}
else
{
if (wc == 1)
{
double[] dv = new double[1];
FieldValue[] result = GetField(fip.Tag);
dv[0] = result[0].ToDouble();
if (!writeDoubleArray(ref dir, dv))
return false;
}
else
{
FieldValue[] result = GetField(fip.Tag);
double[] dp = result[0].ToDoubleArray();
if (!writeDoubleArray(ref dir, dp))
return false;
}
}
break;
case TiffType.ASCII:
{
FieldValue[] result = GetField(fip.Tag);
string cp;
if (fip.PassCount)
cp = result[1].ToString();
else
cp = result[0].ToString();
// add zero ('\0') at the end of the byte array
byte[] stringBytes = Latin1Encoding.GetBytes(cp);
byte[] totalBytes = new byte[stringBytes.Length + 1];
Buffer.BlockCopy(stringBytes, 0, totalBytes, 0, stringBytes.Length);
dir.tdir_count = totalBytes.Length;
if (!writeByteArray(ref dir, totalBytes))
return false;
}
break;
case TiffType.Byte:
case TiffType.SByte:
if (fip.PassCount)
{
byte[] cp;
int wc2;
if (wc == TiffFieldInfo.Variable2)
{
FieldValue[] result = GetField(fip.Tag);
wc2 = result[0].ToInt();
cp = result[1].ToByteArray();
dir.tdir_count = wc2;
}
else
{
// Assume TiffFieldInfo.Variable
FieldValue[] result = GetField(fip.Tag);
wc = result[0].ToShort();
cp = result[1].ToByteArray();
dir.tdir_count = wc;
}
if (!writeByteArray(ref dir, cp))
return false;
}
else
{
if (wc == 1)
{
byte[] cv = new byte[1];
FieldValue[] result = GetField(fip.Tag);
cv[0] = result[0].ToByte();
if (!writeByteArray(ref dir, cv))
return false;
}
else
{
FieldValue[] result = GetField(fip.Tag);
byte[] cp = result[0].ToByteArray();
if (!writeByteArray(ref dir, cp))
return false;
}
}
break;
case TiffType.Undefined:
{
byte[] cp;
int wc2;
if (wc == TiffFieldInfo.Variable)
{
FieldValue[] result = GetField(fip.Tag);
wc = result[0].ToShort();
cp = result[1].ToByteArray();
dir.tdir_count = wc;
}
else if (wc == TiffFieldInfo.Variable2)
{
FieldValue[] result = GetField(fip.Tag);
wc2 = result[0].ToInt();
cp = result[1].ToByteArray();
dir.tdir_count = wc2;
}
else
{
FieldValue[] result = GetField(fip.Tag);
cp = result[0].ToByteArray();
}
if (!writeByteArray(ref dir, cp))
return false;
}
break;
case TiffType.NoType:
break;
}
return true;
}
internal static TiffFieldInfo[] Realloc(TiffFieldInfo[] buffer, int elementCount, int newElementCount)
{
TiffFieldInfo[] newBuffer = new TiffFieldInfo[newElementCount];
if (buffer != null)
{
int copyLength = Math.Min(elementCount, newElementCount);
Array.Copy(buffer, newBuffer, copyLength);
}
return newBuffer;
}
