/// <summary>
/// Gets the value from the index in the /Opt array.
/// </summary>
protected string ValueInOptArray(int index)
{
PDFArray opt = Elements.GetArray(Keys.Opt);
if (opt != null)
{
int count = opt.Elements.Count;
if (index < 0 || index >= count)
{
throw new ArgumentOutOfRangeException("index");
}
PDFItem item = opt.Elements[index];
if (item is PDFString)
{
return(item.ToString());
}
if (item is PDFArray array)
{
if (array.Elements.Count != 0)
{
return(array.Elements[0].ToString());
}
}
}
return("");
}
/// <summary>
/// Gets the index of the specified string in the /Opt array or -1, if no such string exists.
/// </summary>
protected int IndexInOptArray(string value)
{
PDFArray opt = Elements.GetArray(Keys.Opt);
#if DEBUG // Check with //R080317 implemention
PDFArray opt2 = null;
if (Elements[Keys.Opt] is PDFArray)
{
opt2 = Elements[Keys.Opt] as PDFArray;
}
else if (Elements[Keys.Opt] is Advanced.PDFReference)
{
//falls das Array nicht direkt am Element hängt,
//das Array aus dem referenzierten Element holen
opt2 = ((Advanced.PDFReference)Elements[Keys.Opt]).Value as PDFArray;
}
Debug.Assert(ReferenceEquals(opt, opt2));
#endif
if (opt != null)
{
int count = opt.Elements.Count;
for (int idx = 0; idx < count; idx++)
{
PDFItem item = opt.Elements[idx];
if (item is PDFString)
{
if (item.ToString() == value)
{
return(idx);
}
}
else if (item is PDFArray array)
{
if (array.Elements.Count != 0)
{
if (array.Elements[0].ToString() == value)
{
return(idx);
}
}
}
}
}
return(-1);
}
/// <summary>
/// Decodes the data with the specified filter.
/// </summary>
public static byte[] Decode(byte[] data, PDFItem filterItem)
{
byte[] result = null;
if (filterItem is PDFName)
{
Filter filter = GetFilter(filterItem.ToString());
if (filter != null)
{
result = filter.Decode(data);
}
}
else if (filterItem is PDFArray array)
{
foreach (PDFItem item in array)
{
data = Decode(data, item);
}
result = data;
}
return(result);
}