public xObjects::XObject ToXObject(
Document context
)
{
xObjects::FormXObject form;
{
form = new xObjects::FormXObject(context, Box);
form.Resources = (Resources)(context.Equals(Document)
? Resources // Same document: reuses the existing resources.
: Resources.Clone(context) // Alien document: clones the resources.
);
// Body (contents).
{
IBuffer formBody = form.BaseDataObject.Body;
PdfDataObject contentsDataObject = BaseDataObject.Resolve(PdfName.Contents);
if (contentsDataObject is PdfStream)
{
formBody.Append(((PdfStream)contentsDataObject).Body);
}
else
{
foreach (PdfDirectObject contentStreamObject in (PdfArray)contentsDataObject)
{
formBody.Append(((PdfStream)contentStreamObject.Resolve()).Body);
}
}
}
}
return(form);
}
/**
* <summary>Serializes the object stream entries into the stream body.</summary>
*/
private void Flush(
IOutputStream stream
)
{
// 1. Body.
int dataByteOffset;
{
// Serializing the entries into the stream buffer...
IBuffer indexBuffer = new bytes.Buffer();
IBuffer dataBuffer = new bytes.Buffer();
IndirectObjects indirectObjects = File.IndirectObjects;
int objectIndex = -1;
File context = File;
foreach (KeyValuePair <int, ObjectEntry> entry in Entries)
{
int objectNumber = entry.Key;
// Update the xref entry!
XRefEntry xrefEntry = indirectObjects[objectNumber].XrefEntry;
xrefEntry.Offset = ++objectIndex;
/*
* NOTE: The entry offset MUST be updated only after its serialization, in order not to
* interfere with its possible data-object retrieval from the old serialization.
*/
int entryValueOffset = (int)dataBuffer.Length;
// Index.
indexBuffer
.Append(objectNumber.ToString()).Append(Chunk.Space) // Object number.
.Append(entryValueOffset.ToString()).Append(Chunk.Space); // Byte offset (relative to the first one).
// Data.
entry.Value.DataObject.WriteTo(dataBuffer, context);
entry.Value.offset = entryValueOffset;
}
// Get the stream buffer!
IBuffer body = Body;
// Delete the old entries!
body.SetLength(0);
// Add the new entries!
body.Append(indexBuffer);
dataByteOffset = (int)body.Length;
body.Append(dataBuffer);
}
// 2. Header.
{
PdfDictionary header = Header;
header[PdfName.N] = PdfInteger.Get(Entries.Count);
header[PdfName.First] = PdfInteger.Get(dataByteOffset);
}
}
public xObjects::XObject ToXObject(
Document context
)
{
File contextFile = context.File;
xObjects::FormXObject form = new xObjects::FormXObject(context);
PdfStream formStream = form.BaseDataObject;
// Header.
{
PdfDictionary formHeader = formStream.Header;
// Bounding box.
formHeader[PdfName.BBox] = (PdfDirectObject)GetInheritableAttribute(PdfName.MediaBox).Clone(contextFile);
// Resources.
{
PdfDirectObject resourcesObject = GetInheritableAttribute(PdfName.Resources);
// Same document?
/* NOTE: Try to reuse the resource dictionary whenever possible. */
formHeader[PdfName.Resources] = (context.Equals(Document) ?
resourcesObject
: (PdfDirectObject)resourcesObject.Clone(contextFile));
}
}
// Body (contents).
{
IBuffer formBody = formStream.Body;
PdfDataObject contentsDataObject = BaseDataObject.Resolve(PdfName.Contents);
if (contentsDataObject is PdfStream)
{
formBody.Append(((PdfStream)contentsDataObject).Body);
}
else
{
foreach (PdfDirectObject contentStreamObject in (PdfArray)contentsDataObject)
{
formBody.Append(((PdfStream)File.Resolve(contentStreamObject)).Body);
}
}
}
return(form);
}
/**
* <summary>Serializes the xref stream entries into the stream body.</summary>
*/
private void Flush(
IOutputStream stream
)
{
// 1. Body.
PdfArray indexArray = new PdfArray();
int[] entryFieldSizes = new int[]
{
EntryField0Size,
GetFieldSize((int)stream.Length), // NOTE: We assume this xref stream is the last indirect object.
EntryField2Size
};
{
// Get the stream buffer!
IBuffer body = Body;
// Delete the old entries!
body.SetLength(0);
// Serializing the entries into the stream buffer...
int prevObjectNumber = -2; // Previous-entry object number.
foreach (XRefEntry entry in entries.Values)
{
int entryNumber = entry.Number;
if (entryNumber - prevObjectNumber != 1) // Current subsection terminated.
{
if (indexArray.Count > 0)
{
indexArray.Add(PdfInteger.Get(prevObjectNumber - ((PdfInteger)indexArray[indexArray.Count - 1]).IntValue + 1));
} // Number of entries in the previous subsection.
indexArray.Add(PdfInteger.Get(entryNumber)); // First object number in the next subsection.
}
prevObjectNumber = entryNumber;
switch (entry.Usage)
{
case XRefEntry.UsageEnum.Free:
body.Append((byte)FreeEntryType);
body.Append(NumberToByteArray(entry.Offset, entryFieldSizes[1]));
body.Append(NumberToByteArray(entry.Generation, entryFieldSizes[2]));
break;
case XRefEntry.UsageEnum.InUse:
body.Append((byte)InUseEntryType);
body.Append(NumberToByteArray(entry.Offset, entryFieldSizes[1]));
body.Append(NumberToByteArray(entry.Generation, entryFieldSizes[2]));
break;
case XRefEntry.UsageEnum.InUseCompressed:
body.Append((byte)InUseCompressedEntryType);
body.Append(NumberToByteArray(entry.StreamNumber, entryFieldSizes[1]));
body.Append(NumberToByteArray(entry.Offset, entryFieldSizes[2]));
break;
default:
throw new NotSupportedException();
}
}
indexArray.Add(PdfInteger.Get(prevObjectNumber - ((PdfInteger)indexArray[indexArray.Count - 1]).IntValue + 1)); // Number of entries in the previous subsection.
}
// 2. Header.
{
PdfDictionary header = Header;
header[PdfName.Index] = indexArray;
header[PdfName.Size] = PdfInteger.Get(File.IndirectObjects.Count + 1);
header[PdfName.W] = new PdfArray(
PdfInteger.Get(entryFieldSizes[0]),
PdfInteger.Get(entryFieldSizes[1]),
PdfInteger.Get(entryFieldSizes[2])
);
}
}
