public PDFXRefTableEntry this[PDFObjectRef oref]
{
get
{
for (int i = this._sections.Count - 1; i >= 0; i--)
{
PDFXRefTableSection section = this._sections[i];
if (section.Start <= oref.Number && section.Start + section.Count > oref.Number)
{
PDFXRefTableEntry entry = section[oref];
if (null != entry)
{
return(entry);
}
}
}
if (null != this.Previous)
{
return(this.Previous[oref]);
}
else
{
return(null);
}
}
}
/// <summary>
/// Gets the content of the indirect object specifed by the object reference.
/// If the result is not found or does not exist, then an exception is thrown.
/// </summary>
/// <param name="oref"></param>
/// <returns></returns>
public IFileObject AssertGetContent(PDFObjectRef oref)
{
IFileObject result = this.GetContent(oref);
if (null == result)
{
throw new NullReferenceException(String.Format(CommonErrors.AnIndirectObjectWithReferenceCouldNotBeFound, oref));
}
return(result);
}
// not used
/*
#region private PDFObjectRef[] InitPageRefs()
*
* private PDFObjectRef[] InitPageRefs()
* {
* List<PDFObjectRef> all = new List<PDFObjectRef>();
* PDFObjectRef pagetree = this.DocumentCatalog[PagesName] as PDFObjectRef;
* if (null != pagetree)
* this.InitAPageOrTree(pagetree, all, null);
*
* return all.ToArray();
* }
*
#endregion
*
#region private void InitAPageOrTree(PDFObjectRef pagetree, List<PDFObjectRef> all)
*
* private void InitAPageOrTree(PDFObjectRef pageref, List<PDFObjectRef> all, PDFDictionary inherited)
* {
* IParsedIndirectObject obj = this._reader.GetObject(pageref);
* if (null == obj)
* throw new PDFNativeParserException("Cannot find object with reference '" + pageref.ToString());
*
* PDFDictionary dict = obj.GetContents() as PDFDictionary;
* if (null == dict)
* return;
*
* PDFName type = dict[TypeName] as PDFName;
* if (null == type)
* {
* return;
* }
* else if (type.Value == "Pages")
* {
* PDFDictionary newinherited = null;
* PDFArray kids = null;
* //Type, Parent, Kids, Count are standard
* //Others are then inherited in the page.
* foreach (KeyValuePair<PDFName, IFileObject> item in dict)
* {
* switch (item.Key.Value)
* {
* case ("Type"):
* case ("Parent"):
* case ("Count"):
* //Do nothing
* break;
* case ("Kids"):
* kids = item.Value as PDFArray;
* break;
* default:
* if (null == newinherited)
* newinherited = new PDFDictionary();
*
* newinherited.Add(item.Key, item.Value);
* break;
* }
*
* }
* if (null != newinherited && newinherited.Count > 0)
* {
* if (null != inherited && inherited.Count > 0)
* {
* foreach (KeyValuePair<PDFName, IFileObject> item in inherited)
* {
* newinherited.Add(item.Key, item.Value);
* }
* }
* }
* else
* newinherited = inherited;
*
* if (null != kids)
* {
* foreach (PDFObjectRef oref in kids)
* {
* InitAPageOrTree(oref, all, newinherited);
* }
* }
* }
* else if (type.Value == "Page")
* {
* all.Add(pageref);
*
* }
*
* }
*
#endregion
*/
//
// public interface
//
#region public IFileObject GetContent(PDFObjectRef oref)
/// <summary>
/// Gets the main content of object based on the reference
/// </summary>
/// <param name="oref"></param>
/// <returns></returns>
public IFileObject GetContent(PDFObjectRef oref)
{
IParsedIndirectObject obj = this._reader.GetObject(oref);
if (null == obj)
{
return(null);
}
else
{
return(obj.GetContents());
}
}
public PDFXRefTableEntry this[PDFObjectRef oref]
{
get
{
PDFXRefTableEntry entry = this[oref.Number - this.Start];
//check the generations match
if (null != entry && entry.Generation != oref.Generation)
{
entry = null;
}
return(entry);
}
}
/// <summary>
/// Returns true if the object in the file (with reference oref) has an associated stream,
/// and if so sets the data value to that stream data
/// </summary>
/// <param name="oref"></param>
/// <param name="data"></param>
/// <returns></returns>
public bool TryGetStreamData(PDFObjectRef oref, out byte[] data)
{
data = null;
IParsedIndirectObject obj = this._reader.GetObject(oref);
if (null == obj)
{
return(false);
}
else
{
data = obj.GetStreamData();
return(null != data);
}
}
//
// public methods
//
#region public IIndirectObject GetIndirectObject(PDFObjectRef oref)
/// <summary>
/// Reads and returns the object data returned based on the provided reference
/// </summary>
/// <param name="oref"></param>
/// <returns></returns>
public override IParsedIndirectObject GetObject(PDFObjectRef oref)
{
PDFXRefTableEntry entry = this.XRefTable[oref];
if (null != entry)
{
if (entry.Free == false)
{
if (null == entry.Reference)
{
this.Searcher.Position = entry.Offset;
entry.Reference = PDFFileIndirectObject.Parse(this.Searcher, oref.Number, oref.Generation);
}
return((IParsedIndirectObject)entry.Reference);
}
}
return(null);
}
/// <summary>
/// Initializes the known PDF file data such as trailers, xref tables and catalogs
/// </summary>
protected override void InitData(PDFTraceLog log)
{
try
{
if (log.ShouldLog(TraceLevel.Debug))
{
log.Add(TraceLevel.Debug, "PDFReader", "Finding end of file, startxref and trailer positions");
}
this.Searcher.Position = this.Searcher.Length;
PDFFileRange eofPos = AssertFoundRange(Searcher.MatchBackwardString(EndOfFileMarker), EndOfFileMarker);
PDFFileRange startxrefPos = AssertFoundRange(Searcher.MatchBackwardString(StartXRefMarker), StartXRefMarker);
PDFFileRange trailerPos = AssertFoundRange(Searcher.MatchBackwardString(TrailerMarker), TrailerMarker);
if (log.ShouldLog(TraceLevel.Debug))
{
log.Add(TraceLevel.Debug, "PDFReader", "Markers found, loading the trailer dictionary");
}
PDFDictionary trailer = GetTrailerDictionary(trailerPos, startxrefPos);
this._trailer = trailer;
if (log.ShouldLog(TraceLevel.Debug))
{
log.Add(TraceLevel.Debug, "PDFReader", "Markers found, loading the XRef table");
}
PDFObjectRef catalogRef = AssertGetObjectRef(trailer, CatalogObjName, "The '" + CatalogObjName + "' entry couldnot be found in the documents trailer dictionary");
PDFObjectRef infoRef = AssertGetObjectRef(trailer, InfoObjName, "The '" + InfoObjName + "' entry couldnot be found in the documents trailer dictionary");
IFileObject prevXRefObj;
trailer.TryGetValue(PrevXRefName, out prevXRefObj);
long prevOffset = -1;
if (prevXRefObj is PDFNumber)
{
prevOffset = ((PDFNumber)prevXRefObj).Value;
}
else if (prevXRefObj is PDFReal)
{
prevOffset = (long)((PDFNumber)prevXRefObj).Value;
}
PDFXRefTable xref = GetXRefTable(startxrefPos, eofPos, prevOffset);
if (log.ShouldLog(TraceLevel.Debug))
{
log.Add(TraceLevel.Debug, "PDFReader", "References for the catalog and document info found");
}
this._xreftable = xref;
this._info = (PDFFileIndirectObject)this.GetObject(infoRef);
if (log.ShouldLog(TraceLevel.Debug))
{
log.Add(TraceLevel.Debug, "PDFReader", "Loaded the document Info indirect object");
}
this._catalog = (PDFFileIndirectObject)this.GetObject(catalogRef);
if (log.ShouldLog(TraceLevel.Debug))
{
log.Add(TraceLevel.Debug, "PDFReader", "Loaded the document Catalog indirect object");
}
//TODO: Look for more updates and read those in too
}
catch (Exception ex)
{
throw new PDFNativeParserException(CommonErrors.CouldNotInitializeThePDFReader, ex);
}
}
//
// public methods
//
#region public abstract IParsedIndirectObject GetObject(PDFObjectRef oref);
/// <summary>
/// Returns the parsed indirect object that corresponds to the reference provided.
/// </summary>
/// <param name="oref"></param>
/// <returns></returns>
public abstract IParsedIndirectObject GetObject(PDFObjectRef oref);
public Native.PDFObjectRef OutputToPDF(PDFWriter writer, PDFRenderContext context)
{
List <ICategorisedArtefactNamesEntry> entries = new List <ICategorisedArtefactNamesEntry>();
Native.PDFObjectRef oref = null;
if (this.InnerEntries.Count == 0)
{
return(oref);
}
if (this.NameType == PDFCategorisedNameDictionary.DestinationsName)
{
oref = writer.BeginObject();
writer.BeginDictionary();
writer.BeginDictionaryEntry("Names");
string first = null;
string last = null;
writer.BeginArray();
foreach (KeyValuePair <string, IArtefactEntry> kvp in this.InnerEntries)
{
if (string.IsNullOrEmpty(first))
{
first = kvp.Key;
}
else
{
last = kvp.Key;
}
writer.BeginArrayEntry();
writer.WriteStringLiteral(kvp.Key);
writer.EndArrayEntry();
writer.BeginArrayEntry();
((PDFDestination)kvp.Value).OutputToPDF(context, writer);
writer.EndArrayEntry();
writer.WriteLine();
}
writer.EndArray();
writer.EndDictionaryEntry();
if (!string.IsNullOrEmpty(first) && !string.IsNullOrEmpty(last))
{
writer.BeginDictionaryEntry("Limits");
writer.WriteArrayStringEntries(true, first, last);
writer.EndDictionaryEntry();
}
writer.EndDictionary();
writer.EndObject();
}
else //we contain ICategorizedArtefactNameEntry(s)
{
oref = writer.BeginObject();
writer.BeginDictionary();
writer.BeginDictionaryEntry("Names");
//string first = null;
//string last = null;
writer.BeginArray();
foreach (KeyValuePair <string, IArtefactEntry> kvp in this.InnerEntries)
{
//if (string.IsNullOrEmpty(first))
// first = kvp.Key;
//else
// last = kvp.Key;
writer.BeginArrayEntry();
writer.WriteStringLiteral(kvp.Key);
writer.EndArrayEntry();
writer.BeginArrayEntry();
ICategorisedArtefactNamesEntry entry = (ICategorisedArtefactNamesEntry)kvp.Value;
Native.PDFObjectRef entryOref = entry.OutputToPDF(context, writer);
if (null != entryOref)
{
writer.WriteObjectRef(entryOref);
}
writer.EndArrayEntry();
writer.WriteLine();
}
writer.EndArray();
writer.EndDictionaryEntry();
//Limits only required on Intermediate and Leaf nodes of a tree, not the root
//if (!string.IsNullOrEmpty(first) && !string.IsNullOrEmpty(last))
//{
// writer.BeginDictionaryEntry("Limits");
// writer.WriteArrayStringEntries(true, first, last);
// writer.EndDictionaryEntry();
//}
writer.EndDictionary();
writer.EndObject();
}
return(oref);
}
//
// initialization
//
#region protected virtual void Init()
/// <summary>
/// Called from the factory methods once instantiated to initialize the data.
/// </summary>
protected virtual void Init()
{
this._pageTree = this.DocumentCatalog[PagesName] as PDFObjectRef;
}
