public static CosBase GetDictionaryObject(this PdfDictionary dictionary, CosName firstKey, CosName secondKey)
{
CosBase result = dictionary.GetDictionaryObject(firstKey);
if (result == null && secondKey != null)
{
result = dictionary.GetDictionaryObject(secondKey);
}
return(result);
}
public PdfDictionary GetFilterParameters(PdfDictionary streamDictionary, int index)
{
if (streamDictionary == null)
{
throw new ArgumentNullException(nameof(streamDictionary));
}
if (index < 0)
{
throw new ArgumentOutOfRangeException(nameof(index), "Index must be 0 or greater");
}
var filter = streamDictionary.GetDictionaryObject(CosName.FILTER, CosName.F);
var parameters = streamDictionary.GetDictionaryObject(CosName.DECODE_PARMS, CosName.DP);
switch (filter)
{
case CosName _:
if (parameters is PdfDictionary dict)
{
return(dict);
}
break;
case COSArray array:
if (parameters is COSArray arr)
{
if (index < arr.size() && array.getObject(index) is PdfDictionary dictionary)
{
return(dictionary);
}
}
break;
default:
if (parameters != null)
{
log?.Error("Expected the decode parameters for the stream to be either an array or dictionary");
}
break;
}
return(new PdfDictionary());
}
public static CosBase GetDictionaryObject(this PdfDictionary dictionary, IEnumerable <string> keyList)
{
foreach (var key in keyList)
{
var obj = dictionary.GetDictionaryObject(CosName.Create(key));
if (obj != null)
{
return(obj);
}
}
return(null);
}
public bool FindPage(PdfDictionary currentPageDictionary, int soughtPageNumber, List <int> pageNumbersObserved)
{
var type = currentPageDictionary.GetName(CosName.TYPE);
if (type.Equals(CosName.PAGE))
{
var pageNumber = GetNextPageNumber(pageNumbersObserved);
bool found = pageNumber == soughtPageNumber;
locatedPages[pageNumber] = currentPageDictionary;
pageNumbersObserved.Add(pageNumber);
return(found);
}
if (!type.Equals(CosName.PAGES))
{
log.Warn("Did not find the expected type (Page or Pages) in dictionary: " + currentPageDictionary);
return(false);
}
var kids = currentPageDictionary.GetDictionaryObject(CosName.KIDS) as COSArray;
pageFactory.LoadResources(currentPageDictionary, reader, isLenientParsing);
bool childFound = false;
foreach (var kid in kids.OfType <CosObject>())
{
// todo: exit early
var child = pdfObjectParser.Parse(kid.ToIndirectReference(), reader, isLenientParsing) as PdfDictionary;
var thisPageMatches = FindPage(child, soughtPageNumber, pageNumbersObserved);
if (thisPageMatches)
{
childFound = true;
break;
}
}
return(childFound);
}