public PdfDictionary Parse(IRandomAccessRead reader, IBaseParser baseParser, CosObjectPool pool)
{
if (reader == null)
{
throw new ArgumentNullException(nameof(reader));
}
if (baseParser == null)
{
throw new ArgumentNullException(nameof(baseParser));
}
if (pool == null)
{
throw new ArgumentNullException(nameof(pool));
}
ReadHelper.ReadExpectedChar(reader, '<');
ReadHelper.ReadExpectedChar(reader, '<');
ReadHelper.SkipSpaces(reader);
var dictionary = new PdfDictionary();
var done = false;
while (!done)
{
ReadHelper.SkipSpaces(reader);
var c = (char)reader.Peek();
switch (c)
{
case '>':
done = true;
break;
case '/':
var nameValue = ParseCosDictionaryNameValuePair(reader, baseParser, pool);
if (nameValue.key != null && nameValue.value != null)
{
dictionary.Set(nameValue.key, nameValue.value);
}
break;
default:
if (ReadUntilEnd(reader))
{
return(new PdfDictionary());
}
break;
}
}
ReadHelper.ReadExpectedString(reader, ">>");
return(dictionary);
}
private static CosBase ParseValue(IRandomAccessRead reader, IBaseParser baseParser, CosObjectPool pool)
{
var numOffset = reader.GetPosition();
var value = baseParser.Parse(reader, pool);
ReadHelper.SkipSpaces(reader);
// proceed if the given object is a number and the following is a number as well
if (!(value is ICosNumber) || !ReadHelper.IsDigit(reader))
{
return(value);
}
// read the remaining information of the object number
var genOffset = reader.GetPosition();
var generationNumber = baseParser.Parse(reader, pool);
ReadHelper.SkipSpaces(reader);
ReadHelper.ReadExpectedChar(reader, 'R');
if (!(value is CosInt))
{
throw new InvalidOperationException("expected number, actual=" + value + " at offset " + numOffset);
}
if (!(generationNumber is CosInt))
{
throw new InvalidOperationException("expected number, actual=" + value + " at offset " + genOffset);
}
var key = new CosObjectKey(((CosInt)value).AsLong(), ((CosInt)generationNumber).AsInt());
// dereference the object
return(pool.Get(key));
}
public OldCrossReferenceTableParser(ILog log, IDictionaryParser dictionaryParser, IBaseParser baseParser)
{
this.log = log;
this.dictionaryParser = dictionaryParser;
this.baseParser = baseParser;
}
private (CosName key, CosBase value) ParseCosDictionaryNameValuePair(IRandomAccessRead reader, IBaseParser baseParser, CosObjectPool pool)
{
var key = nameParser.Parse(reader);
var value = ParseValue(reader, baseParser, pool);
ReadHelper.SkipSpaces(reader);
if ((char)reader.Peek() == 'd')
{
// if the next string is 'def' then we are parsing a cmap stream
// and want to ignore it, otherwise throw an exception.
var potentialDef = ReadHelper.ReadString(reader);
if (!potentialDef.Equals("def"))
{
reader.Unread(OtherEncodings.StringAsLatin1Bytes(potentialDef));
}
else
{
ReadHelper.SkipSpaces(reader);
}
}
if (value == null)
{
log?.Warn("Bad Dictionary Declaration " + ReadHelper.ReadString(reader));
return(null, null);
}
// label this item as direct, to avoid signature problems.
value.Direct = true;
return(key, value);
}
public PdfDictionary Parse(IRandomAccessRead reader, IBaseParser baseParser, CosObjectPool pool)
{
return(new PdfDictionary());
}
