protected internal virtual byte[] DecodeFlateBytes(PdfStream stream, byte[] bytes)
{
PdfObject filterObject = stream.Get(PdfName.Filter);
if (filterObject == null)
{
return(bytes);
}
// check if flateDecode filter is on top
PdfName filterName;
PdfArray filtersArray = null;
if (filterObject is PdfName)
{
filterName = (PdfName)filterObject;
}
else
{
if (filterObject is PdfArray)
{
filtersArray = (PdfArray)filterObject;
filterName = filtersArray.GetAsName(0);
}
else
{
throw new PdfException(PdfException.FilterIsNotANameOrArray);
}
}
if (!PdfName.FlateDecode.Equals(filterName))
{
return(bytes);
}
// get decode params if present
PdfDictionary decodeParams;
PdfArray decodeParamsArray = null;
PdfObject decodeParamsObject = stream.Get(PdfName.DecodeParms);
if (decodeParamsObject == null)
{
decodeParams = null;
}
else
{
if (decodeParamsObject.GetObjectType() == PdfObject.DICTIONARY)
{
decodeParams = (PdfDictionary)decodeParamsObject;
}
else
{
if (decodeParamsObject.GetObjectType() == PdfObject.ARRAY)
{
decodeParamsArray = (PdfArray)decodeParamsObject;
decodeParams = decodeParamsArray.GetAsDictionary(0);
}
else
{
throw new PdfException(PdfException.DecodeParameterType1IsNotSupported).SetMessageParams(decodeParamsObject
.GetType().ToString());
}
}
}
// decode
byte[] res = FlateDecodeFilter.FlateDecode(bytes, true);
if (res == null)
{
res = FlateDecodeFilter.FlateDecode(bytes, false);
}
bytes = FlateDecodeFilter.DecodePredictor(res, decodeParams);
//remove filter and decode params
filterObject = null;
if (filtersArray != null)
{
filtersArray.Remove(0);
if (filtersArray.Size() == 1)
{
filterObject = filtersArray.Get(0);
}
else
{
if (!filtersArray.IsEmpty())
{
filterObject = filtersArray;
}
}
}
decodeParamsObject = null;
if (decodeParamsArray != null)
{
decodeParamsArray.Remove(0);
if (decodeParamsArray.Size() == 1 && decodeParamsArray.Get(0).GetObjectType() != PdfObject.NULL)
{
decodeParamsObject = decodeParamsArray.Get(0);
}
else
{
if (!decodeParamsArray.IsEmpty())
{
decodeParamsObject = decodeParamsArray;
}
}
}
if (filterObject == null)
{
stream.Remove(PdfName.Filter);
}
else
{
stream.Put(PdfName.Filter, filterObject);
}
if (decodeParamsObject == null)
{
stream.Remove(PdfName.DecodeParms);
}
else
{
stream.Put(PdfName.DecodeParms, decodeParamsObject);
}
return(bytes);
}
public virtual void SetDestOutputProfile(Stream iccStream)
{
PdfStream stream = PdfCieBasedCs.IccBased.GetIccProfileStream(iccStream);
GetPdfObject().Put(PdfName.DestOutputProfile, stream);
}
private bool IsNotMetadataPdfStream(PdfStream pdfStream)
{
return(pdfStream.GetAsName(PdfName.Type) == null || (pdfStream.GetAsName(PdfName.Type) != null && !pdfStream
.GetAsName(PdfName.Type).Equals(PdfName.Metadata)));
}
private void Write(PdfStream pdfStream)
{
try {
bool userDefinedCompression = pdfStream.GetCompressionLevel() != CompressionConstants.UNDEFINED_COMPRESSION;
if (!userDefinedCompression)
{
int defaultCompressionLevel = document != null?document.GetWriter().GetCompressionLevel() : CompressionConstants
.DEFAULT_COMPRESSION;
pdfStream.SetCompressionLevel(defaultCompressionLevel);
}
bool toCompress = pdfStream.GetCompressionLevel() != CompressionConstants.NO_COMPRESSION;
bool allowCompression = !pdfStream.ContainsKey(PdfName.Filter) && IsNotMetadataPdfStream(pdfStream);
if (pdfStream.GetInputStream() != null)
{
Stream fout = this;
DeflaterOutputStream def = null;
OutputStreamEncryption ose = null;
if (crypto != null && !crypto.IsEmbeddedFilesOnly())
{
fout = ose = crypto.GetEncryptionStream(fout);
}
if (toCompress && (allowCompression || userDefinedCompression))
{
UpdateCompressionFilter(pdfStream);
fout = def = new DeflaterOutputStream(fout, pdfStream.GetCompressionLevel(), 0x8000);
}
this.Write((PdfDictionary)pdfStream);
WriteBytes(iText.Kernel.Pdf.PdfOutputStream.stream);
long beginStreamContent = GetCurrentPos();
byte[] buf = new byte[4192];
while (true)
{
int n = pdfStream.GetInputStream().Read(buf);
if (n <= 0)
{
break;
}
fout.Write(buf, 0, n);
}
if (def != null)
{
def.Finish();
}
if (ose != null)
{
ose.Finish();
}
PdfNumber length = pdfStream.GetAsNumber(PdfName.Length);
length.SetValue((int)(GetCurrentPos() - beginStreamContent));
pdfStream.UpdateLength(length.IntValue());
WriteBytes(iText.Kernel.Pdf.PdfOutputStream.endstream);
}
else
{
//When document is opened in stamping mode the output stream can be uninitialized.
//We have to initialize it and write all data from streams input to streams output.
if (pdfStream.GetOutputStream() == null && pdfStream.GetIndirectReference().GetReader() != null)
{
// If new specific compression is set for stream,
// then compressed stream should be decoded and written with new compression settings
byte[] bytes = pdfStream.GetIndirectReference().GetReader().ReadStreamBytes(pdfStream, false);
if (userDefinedCompression)
{
bytes = DecodeFlateBytes(pdfStream, bytes);
}
pdfStream.InitOutputStream(new ByteArrayOutputStream(bytes.Length));
pdfStream.GetOutputStream().Write(bytes);
}
System.Diagnostics.Debug.Assert(pdfStream.GetOutputStream() != null, "PdfStream lost OutputStream");
ByteArrayOutputStream byteArrayStream;
try {
if (toCompress && !ContainsFlateFilter(pdfStream) && (allowCompression || userDefinedCompression))
{
// compress
UpdateCompressionFilter(pdfStream);
byteArrayStream = new ByteArrayOutputStream();
DeflaterOutputStream zip = new DeflaterOutputStream(byteArrayStream, pdfStream.GetCompressionLevel());
if (pdfStream is PdfObjectStream)
{
PdfObjectStream objectStream = (PdfObjectStream)pdfStream;
((ByteArrayOutputStream)objectStream.GetIndexStream().GetOutputStream()).WriteTo(zip);
((ByteArrayOutputStream)objectStream.GetOutputStream().GetOutputStream()).WriteTo(zip);
}
else
{
System.Diagnostics.Debug.Assert(pdfStream.GetOutputStream() != null, "Error in outputStream");
((ByteArrayOutputStream)pdfStream.GetOutputStream().GetOutputStream()).WriteTo(zip);
}
zip.Finish();
}
else
{
if (pdfStream is PdfObjectStream)
{
PdfObjectStream objectStream = (PdfObjectStream)pdfStream;
byteArrayStream = new ByteArrayOutputStream();
((ByteArrayOutputStream)objectStream.GetIndexStream().GetOutputStream()).WriteTo(byteArrayStream);
((ByteArrayOutputStream)objectStream.GetOutputStream().GetOutputStream()).WriteTo(byteArrayStream);
}
else
{
System.Diagnostics.Debug.Assert(pdfStream.GetOutputStream() != null, "Error in outputStream");
byteArrayStream = (ByteArrayOutputStream)pdfStream.GetOutputStream().GetOutputStream();
}
}
if (CheckEncryption(pdfStream))
{
ByteArrayOutputStream encodedStream = new ByteArrayOutputStream();
OutputStreamEncryption ose = crypto.GetEncryptionStream(encodedStream);
byteArrayStream.WriteTo(ose);
ose.Finish();
byteArrayStream = encodedStream;
}
}
catch (System.IO.IOException ioe) {
throw new PdfException(PdfException.IoException, ioe);
}
pdfStream.Put(PdfName.Length, new PdfNumber(byteArrayStream.Length));
pdfStream.UpdateLength((int)byteArrayStream.Length);
this.Write((PdfDictionary)pdfStream);
WriteBytes(iText.Kernel.Pdf.PdfOutputStream.stream);
byteArrayStream.WriteTo(this);
byteArrayStream.Close();
WriteBytes(iText.Kernel.Pdf.PdfOutputStream.endstream);
}
}
catch (System.IO.IOException e) {
throw new PdfException(PdfException.CannotWritePdfStream, e, pdfStream);
}
}
/// <summary>Writes cross reference table and trailer to PDF.</summary>
protected internal virtual void WriteXrefTableAndTrailer(PdfDocument document, PdfObject fileId, PdfObject
crypto)
{
PdfWriter writer = document.GetWriter();
if (!document.properties.appendMode)
{
for (int i = count; i > 0; --i)
{
PdfIndirectReference lastRef = xref[i];
if (lastRef == null || lastRef.IsFree())
{
RemoveFreeRefFromList(i);
--count;
}
else
{
break;
}
}
}
PdfStream xrefStream = null;
if (writer.IsFullCompression())
{
xrefStream = new PdfStream();
xrefStream.MakeIndirect(document);
}
IList <int> sections = CreateSections(document, false);
bool noModifiedObjects = (sections.Count == 0) || (xrefStream != null && sections.Count == 2 && sections[0
] == count && sections[1] == 1);
if (document.properties.appendMode && noModifiedObjects)
{
// No modifications in document
xref = null;
return;
}
long startxref = writer.GetCurrentPos();
long xRefStmPos = -1;
if (xrefStream != null)
{
xrefStream.Put(PdfName.Type, PdfName.XRef);
xrefStream.Put(PdfName.ID, fileId);
if (crypto != null)
{
xrefStream.Put(PdfName.Encrypt, crypto);
}
xrefStream.Put(PdfName.Size, new PdfNumber(this.Size()));
int offsetSize = GetOffsetSize(Math.Max(startxref, Size()));
xrefStream.Put(PdfName.W, new PdfArray(JavaUtil.ArraysAsList((PdfObject) new PdfNumber(1), new PdfNumber(offsetSize
), new PdfNumber(2))));
xrefStream.Put(PdfName.Info, document.GetDocumentInfo().GetPdfObject());
xrefStream.Put(PdfName.Root, document.GetCatalog().GetPdfObject());
PdfArray index = new PdfArray();
foreach (int?section in sections)
{
index.Add(new PdfNumber((int)section));
}
if (document.properties.appendMode && !document.reader.hybridXref)
{
// "not meaningful in hybrid-reference files"
PdfNumber lastXref = new PdfNumber(document.reader.GetLastXref());
xrefStream.Put(PdfName.Prev, lastXref);
}
xrefStream.Put(PdfName.Index, index);
xrefStream.GetIndirectReference().SetOffset(startxref);
iText.Kernel.Pdf.PdfXrefTable xrefTable = document.GetXref();
for (int k = 0; k < sections.Count; k += 2)
{
int first = (int)sections[k];
int len = (int)sections[k + 1];
for (int i = first; i < first + len; i++)
{
PdfIndirectReference reference = xrefTable.Get(i);
if (reference.IsFree())
{
xrefStream.GetOutputStream().Write(0);
xrefStream.GetOutputStream().Write(reference.GetOffset(), offsetSize);
xrefStream.GetOutputStream().Write(reference.GetGenNumber(), 2);
}
else
{
if (reference.GetObjStreamNumber() == 0)
{
xrefStream.GetOutputStream().Write(1);
xrefStream.GetOutputStream().Write(reference.GetOffset(), offsetSize);
xrefStream.GetOutputStream().Write(reference.GetGenNumber(), 2);
}
else
{
xrefStream.GetOutputStream().Write(2);
xrefStream.GetOutputStream().Write(reference.GetObjStreamNumber(), offsetSize);
xrefStream.GetOutputStream().Write(reference.GetIndex(), 2);
}
}
}
}
xrefStream.Flush();
xRefStmPos = startxref;
}
// For documents with hybrid cross-reference table, i.e. containing xref streams as well as regular xref sections,
// we write additional regular xref section at the end of the document because the /Prev reference from
// xref stream to a regular xref section doesn't seem to be valid
bool needsRegularXref = !writer.IsFullCompression() || (document.properties.appendMode && document.reader.
hybridXref);
if (needsRegularXref)
{
startxref = writer.GetCurrentPos();
writer.WriteString("xref\n");
iText.Kernel.Pdf.PdfXrefTable xrefTable = document.GetXref();
if (xRefStmPos != -1)
{
// Get rid of all objects from object stream. This is done for hybrid documents
sections = CreateSections(document, true);
}
for (int k = 0; k < sections.Count; k += 2)
{
int first = (int)sections[k];
int len = (int)sections[k + 1];
writer.WriteInteger(first).WriteSpace().WriteInteger(len).WriteByte((byte)'\n');
for (int i = first; i < first + len; i++)
{
PdfIndirectReference reference = xrefTable.Get(i);
StringBuilder off = new StringBuilder("0000000000").Append(reference.GetOffset());
StringBuilder gen = new StringBuilder("00000").Append(reference.GetGenNumber());
writer.WriteString(off.JSubstring(off.Length - 10, off.Length)).WriteSpace().WriteString(gen.JSubstring(gen
.Length - 5, gen.Length)).WriteSpace();
if (reference.IsFree())
{
writer.WriteBytes(freeXRefEntry);
}
else
{
writer.WriteBytes(inUseXRefEntry);
}
}
}
PdfDictionary trailer = document.GetTrailer();
// Remove all unused keys in case stamp mode in case original file has full compression, but destination file has not.
trailer.Remove(PdfName.W);
trailer.Remove(PdfName.Index);
trailer.Remove(PdfName.Type);
trailer.Remove(PdfName.Length);
trailer.Put(PdfName.Size, new PdfNumber(this.Size()));
trailer.Put(PdfName.ID, fileId);
if (xRefStmPos != -1)
{
trailer.Put(PdfName.XRefStm, new PdfNumber(xRefStmPos));
}
if (crypto != null)
{
trailer.Put(PdfName.Encrypt, crypto);
}
writer.WriteString("trailer\n");
if (document.properties.appendMode)
{
PdfNumber lastXref = new PdfNumber(document.reader.GetLastXref());
trailer.Put(PdfName.Prev, lastXref);
}
writer.Write(document.GetTrailer());
writer.Write('\n');
}
WriteKeyInfo(document);
writer.WriteString("startxref\n").WriteLong(startxref).WriteString("\n%%EOF\n");
xref = null;
freeReferencesLinkedList.Clear();
}
private bool IsXRefStream(PdfStream pdfStream)
{
return(PdfName.XRef.Equals(pdfStream.GetAsName(PdfName.Type)));
}
/// <summary>
/// Adds
/// <see cref="PdfStream"/>
/// to the resources as form.
/// </summary>
/// <param name="form">
/// the
/// <see cref="PdfStream"/>
/// to add.
/// </param>
/// <returns>added form resources name.</returns>
public virtual PdfName AddForm(PdfStream form)
{
return(AddResource(form, formNamesGen));
}
public virtual PdfFormXObject GetForm(PdfName name)
{
PdfStream form = GetResource(PdfName.Form).GetAsStream(name);
return(form != null ? new PdfFormXObject(form) : null);
}
public virtual PdfImageXObject GetImage(PdfName name)
{
PdfStream image = GetResource(PdfName.Image).GetAsStream(name);
return(image != null ? new PdfImageXObject(image) : null);
}
/// <summary>
/// Adds
/// <see cref="PdfStream"/>
/// to the resources as image.
/// </summary>
/// <param name="image">
/// the
/// <see cref="PdfStream"/>
/// to add.
/// </param>
/// <returns>added image resources name.</returns>
public virtual PdfName AddImage(PdfStream image)
{
return(AddResource(image, imageNamesGen));
}
protected internal CustomPdfXObject(PdfStream pdfObject)
: base(pdfObject)
{
}
public virtual PdfFormXObject GetForm(PdfName name)
{
PdfStream form = GetResource(PdfName.XObject).GetAsStream(name);
return(form != null && PdfName.Form.Equals(form.GetAsName(PdfName.Subtype)) ? new PdfFormXObject(form) : null);
}
/// <summary>Writes cross reference table and trailer to PDF.</summary>
/// <exception cref="System.IO.IOException"/>
protected internal virtual void WriteXrefTableAndTrailer(PdfDocument document, PdfObject fileId, PdfObject
crypto)
{
PdfWriter writer = document.GetWriter();
if (!document.properties.appendMode)
{
for (int i = count; i > 0; --i)
{
PdfIndirectReference lastRef = xref[i];
if (lastRef == null || lastRef.IsFree())
{
RemoveFreeRefFromList(i);
--count;
}
else
{
break;
}
}
}
IList <int> sections = new List <int>();
int first = 0;
int len = 0;
for (int i = 0; i < Size(); i++)
{
PdfIndirectReference reference = xref[i];
if (document.properties.appendMode && reference != null && !reference.CheckState(PdfObject.MODIFIED))
{
reference = null;
}
if (reference == null)
{
if (len > 0)
{
sections.Add(first);
sections.Add(len);
}
len = 0;
}
else
{
if (len > 0)
{
len++;
}
else
{
first = i;
len = 1;
}
}
}
if (len > 0)
{
sections.Add(first);
sections.Add(len);
}
if (document.properties.appendMode && sections.Count == 0)
{
// no modifications.
xref = null;
return;
}
long startxref = writer.GetCurrentPos();
if (writer.IsFullCompression())
{
PdfStream xrefStream = (PdfStream) new PdfStream().MakeIndirect(document);
xrefStream.MakeIndirect(document);
xrefStream.Put(PdfName.Type, PdfName.XRef);
xrefStream.Put(PdfName.ID, fileId);
if (crypto != null)
{
xrefStream.Put(PdfName.Encrypt, crypto);
}
xrefStream.Put(PdfName.Size, new PdfNumber(this.Size()));
int offsetSize = GetOffsetSize(Math.Max(startxref, Size()));
xrefStream.Put(PdfName.W, new PdfArray(JavaUtil.ArraysAsList((PdfObject) new PdfNumber(1), new PdfNumber(offsetSize
), new PdfNumber(2))));
xrefStream.Put(PdfName.Info, document.GetDocumentInfo().GetPdfObject());
xrefStream.Put(PdfName.Root, document.GetCatalog().GetPdfObject());
PdfArray index = new PdfArray();
foreach (int?section in sections)
{
index.Add(new PdfNumber((int)section));
}
if (document.properties.appendMode)
{
PdfNumber lastXref = new PdfNumber(document.reader.GetLastXref());
xrefStream.Put(PdfName.Prev, lastXref);
}
xrefStream.Put(PdfName.Index, index);
iText.Kernel.Pdf.PdfXrefTable xrefTable = document.GetXref();
for (int k = 0; k < sections.Count; k += 2)
{
first = (int)sections[k];
len = (int)sections[k + 1];
for (int i = first; i < first + len; i++)
{
PdfIndirectReference reference = xrefTable.Get(i);
if (reference.IsFree())
{
xrefStream.GetOutputStream().Write(0);
xrefStream.GetOutputStream().Write(reference.GetOffset(), offsetSize);
xrefStream.GetOutputStream().Write(reference.GetGenNumber(), 2);
}
else
{
if (reference.GetObjStreamNumber() == 0)
{
xrefStream.GetOutputStream().Write(1);
xrefStream.GetOutputStream().Write(reference.GetOffset(), offsetSize);
xrefStream.GetOutputStream().Write(reference.GetGenNumber(), 2);
}
else
{
xrefStream.GetOutputStream().Write(2);
xrefStream.GetOutputStream().Write(reference.GetObjStreamNumber(), offsetSize);
xrefStream.GetOutputStream().Write(reference.GetIndex(), 2);
}
}
}
}
xrefStream.Flush();
}
else
{
writer.WriteString("xref\n");
iText.Kernel.Pdf.PdfXrefTable xrefTable = document.GetXref();
for (int k = 0; k < sections.Count; k += 2)
{
first = (int)sections[k];
len = (int)sections[k + 1];
writer.WriteInteger(first).WriteSpace().WriteInteger(len).WriteByte((byte)'\n');
for (int i = first; i < first + len; i++)
{
PdfIndirectReference reference = xrefTable.Get(i);
StringBuilder off = new StringBuilder("0000000000").Append(reference.GetOffset());
StringBuilder gen = new StringBuilder("00000").Append(reference.GetGenNumber());
writer.WriteString(off.JSubstring(off.Length - 10, off.Length)).WriteSpace().WriteString(gen.JSubstring(gen
.Length - 5, gen.Length)).WriteSpace();
if (reference.IsFree())
{
writer.WriteBytes(freeXRefEntry);
}
else
{
writer.WriteBytes(inUseXRefEntry);
}
}
}
PdfDictionary trailer = document.GetTrailer();
// Remove all unused keys in case stamp mode in case original file has full compression, but destination file has not.
trailer.Remove(PdfName.W);
trailer.Remove(PdfName.Index);
trailer.Remove(PdfName.Type);
trailer.Remove(PdfName.Length);
trailer.Put(PdfName.Size, new PdfNumber(this.Size()));
trailer.Put(PdfName.ID, fileId);
if (crypto != null)
{
trailer.Put(PdfName.Encrypt, crypto);
}
writer.WriteString("trailer\n");
if (document.properties.appendMode)
{
PdfNumber lastXref = new PdfNumber(document.reader.GetLastXref());
trailer.Put(PdfName.Prev, lastXref);
}
writer.Write(document.GetTrailer());
writer.Write('\n');
}
WriteKeyInfo(document);
writer.WriteString("startxref\n").WriteLong(startxref).WriteString("\n%%EOF\n");
xref = null;
freeReferencesLinkedList.Clear();
}
