public void AddXRef(TokenXRefEntry xref)
{
PdfIndirectObject indirect = new PdfIndirectObject(this, xref);
if (_gens == null)
{
if (_single == null)
{
// Cache the single object
_single = indirect;
return;
}
else
{
// Convert from single entry to using a dictionary
_gens = new Dictionary <int, PdfIndirectObject> {
{ _single.Gen, _single }
};
_single = null;
}
}
if (_gens.ContainsKey(xref.Gen))
{
// PH: ignore this ref and let the document be still loaded
// TODO: should signal any kind of warning to the caller
return;
//throw new ApplicationException($"Indirect object with Id:{xref.Id} Gen:{xref.Gen} already exists.");
}
_gens.Add(indirect.Gen, indirect);
}
public void AddXRef(TokenXRefEntry xref)
{
PdfIndirectObject indirect = new PdfIndirectObject(this, xref);
if (_gens == null)
{
if (_single == null)
{
// Cache the single object
_single = indirect;
return;
}
else
{
// Convert from single entry to using a dictionary
_gens = new Dictionary <int, PdfIndirectObject> {
{ _single.Gen, _single }
};
_single = null;
}
}
if (_gens.ContainsKey(xref.Gen))
{
throw new ApplicationException($"Indirect object with Id:{xref.Id} Gen:{xref.Gen} already exists.");
}
_gens.Add(indirect.Gen, indirect);
}
public void Visit(PdfIndirectObject indirectObject)
{
PushLevel();
Append($"Id:{indirectObject.Id} Gen:{indirectObject.Gen} Offset:{indirectObject.Offset}");
VisitNotNull(indirectObject.Child);
CurrentLevelNewLine();
PopLevel();
}
public PdfObject ResolveReference(Parser parser, PdfIndirectObject indirect)
{
if (indirect != null)
{
if (indirect.Child == null)
{
ParseIndirectObject parseIndirectObject = parser.ParseIndirectObject(indirect.Offset);
indirect.Child = indirect.WrapObject(parseIndirectObject.Object);
}
return(indirect.Child);
}
return(null);
}
private byte[] DecodeBytes(PdfObject obj, byte[] bytes)
{
PdfIndirectObject indirectObject = obj.TypedParent <PdfIndirectObject>();
if (indirectObject == null)
{
throw new ApplicationException($"Cannot decrypt a string that is not inside an indirect object.");
}
// Create bytes that need hashing by combining the encryption key with the indirect object numbers
byte[] key = new byte[_encryptionKey.Length + 5];
Array.Copy(_encryptionKey, 0, key, 0, _encryptionKey.Length);
int index = _encryptionKey.Length;
int id = indirectObject.Id;
key[index++] = (byte)(id >> 0);
key[index++] = (byte)(id >> 8);
key[index++] = (byte)(id >> 16);
int gen = indirectObject.Gen;
key[index++] = (byte)(gen >> 0);
key[index++] = (byte)(gen >> 8);
// MD5 hash the bytes to get raw decrypt key
key = _md5.ComputeHash(key);
// Limit check the decrypt key length
int keyLength = _encryptionKey.Length + 5;
if (keyLength > 16)
{
keyLength = 16;
}
// Create the RC4 key
byte[] rc4Key = new Byte[keyLength];
Array.Copy(key, 0, rc4Key, 0, keyLength);
return(RC4.Transform(rc4Key, bytes));
}
public PdfObject ResolveReference(PdfIndirectObject indirect)
{
return(ResolveReference(_parser, indirect));
}
