/** * Returns the CrossReferenceTable of the <CODE>Body</CODE>. * @param os * @param root * @param info * @param encryption * @param fileID * @param prevxref * @throws IOException */ internal void WriteCrossReferenceTable(Stream os, PdfIndirectReference root, PdfIndirectReference info, PdfIndirectReference encryption, PdfObject fileID, int prevxref) { int refNumber = 0; if (writer.FullCompression) { FlushObjStm(); refNumber = IndirectReferenceNumber; xrefs[new PdfCrossReference(refNumber, position)] = null; } int first = ((PdfCrossReference)xrefs.GetMinKey()).Refnum; int len = 0; ArrayList sections = new ArrayList(); foreach (PdfCrossReference entry in xrefs.Keys) { if (first + len == entry.Refnum) ++len; else { sections.Add(first); sections.Add(len); first = entry.Refnum; len = 1; } } sections.Add(first); sections.Add(len); if (writer.FullCompression) { int mid = 4; uint mask = 0xff000000; for (; mid > 1; --mid) { if ((mask & position) != 0) break; mask >>= 8; } ByteBuffer buf = new ByteBuffer(); foreach (PdfCrossReference entry in xrefs.Keys) { entry.ToPdf(mid, buf); } PdfStream xr = new PdfStream(buf.ToByteArray()); buf = null; xr.FlateCompress(writer.CompressionLevel); xr.Put(PdfName.SIZE, new PdfNumber(Size)); xr.Put(PdfName.ROOT, root); if (info != null) { xr.Put(PdfName.INFO, info); } if (encryption != null) xr.Put(PdfName.ENCRYPT, encryption); if (fileID != null) xr.Put(PdfName.ID, fileID); xr.Put(PdfName.W, new PdfArray(new int[]{1, mid, 2})); xr.Put(PdfName.TYPE, PdfName.XREF); PdfArray idx = new PdfArray(); for (int k = 0; k < sections.Count; ++k) idx.Add(new PdfNumber((int)sections[k])); xr.Put(PdfName.INDEX, idx); if (prevxref > 0) xr.Put(PdfName.PREV, new PdfNumber(prevxref)); PdfEncryption enc = writer.crypto; writer.crypto = null; PdfIndirectObject indirect = new PdfIndirectObject(refNumber, xr, writer); indirect.WriteTo(writer.Os); writer.crypto = enc; } else { byte[] tmp = GetISOBytes("xref\n"); os.Write(tmp, 0, tmp.Length); IEnumerator i = xrefs.Keys; i.MoveNext(); for (int k = 0; k < sections.Count; k += 2) { first = (int)sections[k]; len = (int)sections[k + 1]; tmp = GetISOBytes(first.ToString()); os.Write(tmp, 0, tmp.Length); os.WriteByte((byte)' '); tmp = GetISOBytes(len.ToString()); os.Write(tmp, 0, tmp.Length); os.WriteByte((byte)'\n'); while (len-- > 0) { ((PdfCrossReference)i.Current).ToPdf(os); i.MoveNext(); } } } }
internal PdfIndirectObject Add(PdfObject objecta, int refNumber, bool inObjStm) { if (inObjStm && objecta.CanBeInObjStm() && writer.FullCompression) { PdfCrossReference pxref = AddToObjStm(objecta, refNumber); PdfIndirectObject indirect = new PdfIndirectObject(refNumber, objecta, writer); xrefs.Remove(pxref); xrefs[pxref] = null; return indirect; } else { PdfIndirectObject indirect = new PdfIndirectObject(refNumber, objecta, writer); PdfCrossReference pxref = new PdfCrossReference(refNumber, position); xrefs.Remove(pxref); xrefs[pxref] = null; indirect.WriteTo(writer.Os); position = writer.Os.Counter; return indirect; } }