/**
* Gets number of indirect. If type of directed indirect is PAGES, it refers PAGE object through KIDS.
* (Contributed by Kazuya Ujihara)
* @param indirect
* 2004-06-13
*/
private static int GetNumber(PdfIndirectReference indirect)
{
PdfDictionary pdfObj = (PdfDictionary)PdfReader.GetPdfObjectRelease(indirect);
if (pdfObj.Contains(PdfName.TYPE) && pdfObj.Get(PdfName.TYPE).Equals(PdfName.PAGES) && pdfObj.Contains(PdfName.KIDS))
{
PdfArray kids = (PdfArray)pdfObj.Get(PdfName.KIDS);
indirect = (PdfIndirectReference)kids[0];
}
return(indirect.Number);
}
/**
* Retrieves the page labels from a PDF as an array of {@link PdfPageLabelFormat} objects.
* @param reader a PdfReader object that has the page labels you want to retrieve
* @return a PdfPageLabelEntry array, containing an entry for each format change
* or <code>null</code> if no page labels are present
*/
public static PdfPageLabelFormat[] GetPageLabelFormats(PdfReader reader)
{
PdfDictionary dict = reader.Catalog;
PdfDictionary labels = (PdfDictionary)PdfReader.GetPdfObjectRelease(dict.Get(PdfName.PAGELABELS));
if (labels == null)
{
return(null);
}
Hashtable numberTree = PdfNumberTree.ReadTree(labels);
int[] numbers = new int[numberTree.Count];
numberTree.Keys.CopyTo(numbers, 0);
Array.Sort(numbers);
PdfPageLabelFormat[] formats = new PdfPageLabelFormat[numberTree.Count];
String prefix;
int numberStyle;
int pagecount;
for (int k = 0; k < numbers.Length; ++k)
{
int key = numbers[k];
PdfDictionary d = (PdfDictionary)PdfReader.GetPdfObjectRelease((PdfObject)numberTree[key]);
if (d.Contains(PdfName.ST))
{
pagecount = ((PdfNumber)d.Get(PdfName.ST)).IntValue;
}
else
{
pagecount = 1;
}
if (d.Contains(PdfName.P))
{
prefix = ((PdfString)d.Get(PdfName.P)).ToUnicodeString();
}
else
{
prefix = "";
}
if (d.Contains(PdfName.S))
{
char type = ((PdfName)d.Get(PdfName.S)).ToString()[1];
switch (type)
{
case 'R': numberStyle = UPPERCASE_ROMAN_NUMERALS; break;
case 'r': numberStyle = LOWERCASE_ROMAN_NUMERALS; break;
case 'A': numberStyle = UPPERCASE_LETTERS; break;
case 'a': numberStyle = LOWERCASE_LETTERS; break;
default: numberStyle = DECIMAL_ARABIC_NUMERALS; break;
}
}
else
{
numberStyle = EMPTY;
}
formats[k] = new PdfPageLabelFormat(key + 1, numberStyle, prefix, pagecount);
}
return(formats);
}
/**
* Retrieves the page labels from a PDF as an array of String objects.
* @param reader a PdfReader object that has the page labels you want to retrieve
* @return a String array or <code>null</code> if no page labels are present
*/
public static String[] GetPageLabels(PdfReader reader)
{
int n = reader.NumberOfPages;
PdfDictionary dict = reader.Catalog;
PdfDictionary labels = (PdfDictionary)PdfReader.GetPdfObjectRelease(dict.Get(PdfName.PAGELABELS));
if (labels == null)
{
return(null);
}
String[] labelstrings = new String[n];
Hashtable numberTree = PdfNumberTree.ReadTree(labels);
int pagecount = 1;
String prefix = "";
char type = 'D';
for (int i = 0; i < n; i++)
{
if (numberTree.ContainsKey(i))
{
PdfDictionary d = (PdfDictionary)PdfReader.GetPdfObjectRelease((PdfObject)numberTree[i]);
if (d.Contains(PdfName.ST))
{
pagecount = ((PdfNumber)d.Get(PdfName.ST)).IntValue;
}
else
{
pagecount = 1;
}
if (d.Contains(PdfName.P))
{
prefix = ((PdfString)d.Get(PdfName.P)).ToUnicodeString();
}
if (d.Contains(PdfName.S))
{
type = ((PdfName)d.Get(PdfName.S)).ToString()[1];
}
}
switch (type)
{
default:
labelstrings[i] = prefix + pagecount;
break;
case 'R':
labelstrings[i] = prefix + RomanNumberFactory.GetUpperCaseString(pagecount);
break;
case 'r':
labelstrings[i] = prefix + RomanNumberFactory.GetLowerCaseString(pagecount);
break;
case 'A':
labelstrings[i] = prefix + RomanAlphabetFactory.GetUpperCaseString(pagecount);
break;
case 'a':
labelstrings[i] = prefix + RomanAlphabetFactory.GetLowerCaseString(pagecount);
break;
}
pagecount++;
}
return(labelstrings);
}