/// <summary>
/// Initializes a new instance of the <see cref="PdfTrailer"/> class from a <see cref="PdfCrossReferenceStream"/>.
/// </summary>
public PdfTrailer(PdfCrossReferenceStream trailer)
: base(trailer._document)
{
_document = trailer._document;
// /ID [<09F877EBF282E9408ED1882A9A21D9F2><2A4938E896006F499AC1C2EA7BFB08E4>]
// /Info 7 0 R
// /Root 1 0 R
// /Size 10
PdfReference iref = trailer.Elements.GetReference(Keys.Info);
if (iref != null)
{
Elements.SetReference(Keys.Info, iref);
}
Elements.SetReference(Keys.Root, trailer.Elements.GetReference(Keys.Root));
Elements.SetInteger(Keys.Size, trailer.Elements.GetInteger(Keys.Size));
PdfArray id = trailer.Elements.GetArray(Keys.ID);
if (id != null)
{
Elements.SetValue(Keys.ID, id);
}
}
/// <summary>
/// Initializes a new instance of the <see cref="PdfTrailer"/> class from a <see cref="PdfCrossReferenceStream"/>.
/// </summary>
public PdfTrailer(PdfCrossReferenceStream trailer)
: base(trailer._document)
{
_document = trailer._document;
// /ID [<09F877EBF282E9408ED1882A9A21D9F2><2A4938E896006F499AC1C2EA7BFB08E4>]
// /Info 7 0 R
// /Root 1 0 R
// /Size 10
PdfReference iref = trailer.Elements.GetReference(Keys.Info);
if (iref != null)
Elements.SetReference(Keys.Info, iref);
Elements.SetReference(Keys.Root, trailer.Elements.GetReference(Keys.Root));
Elements.SetInteger(Keys.Size, trailer.Elements.GetInteger(Keys.Size));
PdfArray id = trailer.Elements.GetArray(Keys.ID);
if (id != null)
Elements.SetValue(Keys.ID, id);
}
/// <summary>
/// Reads cross reference stream(s).
/// </summary>
private PdfTrailer ReadXRefStream(PdfCrossReferenceTable xrefTable)
{
// Read cross reference stream.
//Debug.Assert(_lexer.Symbol == Symbol.Integer);
int number = _lexer.TokenToInteger;
int generation = ReadInteger();
Debug.Assert(generation == 0);
ReadSymbol(Symbol.Obj);
ReadSymbol(Symbol.BeginDictionary);
PdfObjectID objectID = new PdfObjectID(number, generation);
PdfCrossReferenceStream xrefStream = new PdfCrossReferenceStream(_document);
ReadDictionary(xrefStream, false);
ReadSymbol(Symbol.BeginStream);
ReadStream(xrefStream);
//xrefTable.Add(new PdfReference(objectID, position));
PdfReference iref = new PdfReference(xrefStream);
iref.ObjectID = objectID;
iref.Value = xrefStream;
xrefTable.Add(iref);
Debug.Assert(xrefStream.Stream != null);
//string sValue = new RawEncoding().GetString(xrefStream.Stream.UnfilteredValue,);
//sValue.GetType();
byte[] bytesRaw = xrefStream.Stream.UnfilteredValue;
byte[] bytes = bytesRaw;
// HACK: Should be done in UnfilteredValue.
if (xrefStream.Stream.HasDecodeParams)
{
int predictor = xrefStream.Stream.DecodePredictor;
int columns = xrefStream.Stream.DecodeColumns;
bytes = DecodeCrossReferenceStream(bytesRaw, columns, predictor);
}
#if DEBUG_
for (int idx = 0; idx < bytes.Length; idx++)
{
if (idx % 4 == 0)
Console.WriteLine();
Console.Write("{0:000} ", (int)bytes[idx]);
}
Console.WriteLine();
#endif
// bytes.GetType();
// Add to table.
// xrefTable.Add(new PdfReference(objectID, -1));
int size = xrefStream.Elements.GetInteger(PdfCrossReferenceStream.Keys.Size);
PdfArray index = xrefStream.Elements.GetValue(PdfCrossReferenceStream.Keys.Index) as PdfArray;
int prev = xrefStream.Elements.GetInteger(PdfCrossReferenceStream.Keys.Prev);
PdfArray w = (PdfArray)xrefStream.Elements.GetValue(PdfCrossReferenceStream.Keys.W);
// E.g.: W[1 2 1] ¤ Index[7 12] ¤ Size 19
// Setup subsections.
int subsectionCount;
int[][] subsections = null;
int subsectionEntryCount = 0;
if (index == null)
{
// Setup with default values.
subsectionCount = 1;
subsections = new int[subsectionCount][];
subsections[0] = new int[] { 0, size }; // HACK: What is size? Contratiction in PDF reference.
subsectionEntryCount = size;
}
else
{
// Read subsections from array.
Debug.Assert(index.Elements.Count % 2 == 0);
subsectionCount = index.Elements.Count / 2;
subsections = new int[subsectionCount][];
for (int idx = 0; idx < subsectionCount; idx++)
{
subsections[idx] = new int[] { index.Elements.GetInteger(2 * idx), index.Elements.GetInteger(2 * idx + 1) };
subsectionEntryCount += subsections[idx][1];
}
}
// W key.
Debug.Assert(w.Elements.Count == 3);
int[] wsize = { w.Elements.GetInteger(0), w.Elements.GetInteger(1), w.Elements.GetInteger(2) };
int wsum = StreamHelper.WSize(wsize);
if (wsum * subsectionEntryCount != bytes.Length)
GetType();
Debug.Assert(wsum * subsectionEntryCount == bytes.Length, "Check implementation here.");
int testcount = subsections[0][1];
int[] currentSubsection = subsections[0];
#if DEBUG && CORE
if (PdfDiagnostics.TraceXrefStreams)
{
for (int idx = 0; idx < testcount; idx++)
{
uint field1 = StreamHelper.ReadBytes(bytes, idx * wsum, wsize[0]);
uint field2 = StreamHelper.ReadBytes(bytes, idx * wsum + wsize[0], wsize[1]);
uint field3 = StreamHelper.ReadBytes(bytes, idx * wsum + wsize[0] + wsize[1], wsize[2]);
string res = String.Format("{0,2:00}: {1} {2,5} {3} // ", idx, field1, field2, field3);
switch (field1)
{
case 0:
res += "Fee list: object number, generation number";
break;
case 1:
res += "Not compresed: offset, generation number";
break;
case 2:
res += "Compressed: object stream object number, index in stream";
break;
default:
res += "??? Type undefined";
break;
}
Debug.WriteLine(res);
}
}
#endif
int index2 = -1;
for (int ssc = 0; ssc < subsectionCount; ssc++)
{
int abc = subsections[ssc][1];
for (int idx = 0; idx < abc; idx++)
{
index2++;
PdfCrossReferenceStream.CrossReferenceStreamEntry item =
new PdfCrossReferenceStream.CrossReferenceStreamEntry();
item.Type = StreamHelper.ReadBytes(bytes, index2 * wsum, wsize[0]);
item.Field2 = StreamHelper.ReadBytes(bytes, index2 * wsum + wsize[0], wsize[1]);
item.Field3 = StreamHelper.ReadBytes(bytes, index2 * wsum + wsize[0] + wsize[1], wsize[2]);
xrefStream.Entries.Add(item);
switch (item.Type)
{
case 0:
// Nothing to do, not needed.
break;
case 1: // offset / generation number
//// Even it is restricted, an object can exists in more than one subsection.
//// (PDF Reference Implementation Notes 15).
int position = (int)item.Field2;
objectID = ReadObjectNumber(position);
#if DEBUG
if (objectID.ObjectNumber == 1074)
GetType();
#endif
Debug.Assert(objectID.GenerationNumber == item.Field3);
//// Ignore the latter one.
if (!xrefTable.Contains(objectID))
{
#if DEBUG
GetType();
#endif
// Add iref for all uncrompressed objects.
xrefTable.Add(new PdfReference(objectID, position));
}
break;
case 2:
// Nothing to do yet.
break;
}
}
}
return xrefStream;
}
