public ParseIndirectObject ParseIndirectObject()
{
Tokenizer.IgnoreComments = true;
TokenObject t = Tokenizer.GetToken();
ThrowOnEmptyOrError(t);
// Indirect object starts with an integer, the object identifier
if (!(t is TokenInteger))
{
Tokenizer.PushToken(t);
return(null);
}
// Second is another integer, the generation number
TokenObject u = Tokenizer.GetToken();
ThrowOnEmptyOrError(u);
if (!(u is TokenInteger))
{
Tokenizer.PushToken(t);
Tokenizer.PushToken(u);
return(null);
}
// This is the keyword 'obj'
TokenObject v = Tokenizer.GetToken();
ThrowOnEmptyOrError(v);
if (!(v is TokenKeyword) || ((v as TokenKeyword).Value != ParseKeyword.Obj))
{
Tokenizer.PushToken(t);
Tokenizer.PushToken(u);
Tokenizer.PushToken(v);
return(null);
}
// Get actual object that is the content
ParseObjectBase obj = ParseObject();
if (obj == null)
{
throw new ApplicationException($"Indirect object has missing content.");
}
// Must be followed by either 'endobj' or 'stream'
v = Tokenizer.GetToken();
ThrowOnEmptyOrError(v);
TokenKeyword keyword = v as TokenKeyword;
if (keyword == null)
{
// PH: FIXME:
//throw new ApplicationException($"Indirect object has missing 'endobj or 'stream'.");
return(new ParseIndirectObject(t as TokenInteger, u as TokenInteger, new ParseInteger(0)));
}
if (keyword.Value == ParseKeyword.EndObj)
{
return(new ParseIndirectObject(t as TokenInteger, u as TokenInteger, obj));
}
else if (keyword.Value == ParseKeyword.Stream)
{
ParseDictionary dictionary = obj as ParseDictionary;
if (dictionary == null)
{
throw new ApplicationException($"Stream must be preceded by a dictionary.");
}
if (!dictionary.ContainsName("Length"))
{
throw new ApplicationException($"Stream dictionary must contain a 'Length' entry.");
}
ParseObjectBase lengthObj = dictionary["Length"];
// Resolve any object reference
ParseObjectReference reference = lengthObj as ParseObjectReference;
if (reference != null)
{
lengthObj = OnResolveReference(reference);
}
ParseInteger length = lengthObj as ParseInteger;
if (length == null)
{
throw new ApplicationException($"Stream dictionary has a 'Length' entry that is not an integer entry.");
}
if (length.Value < 0)
{
throw new ApplicationException($"Stream dictionary has a 'Length' less than 0.");
}
byte[] bytes = Tokenizer.GetBytes(length.Value);
if (bytes == null)
{
throw new ApplicationException($"Cannot read in expected {length.Value} bytes from stream.");
}
// Stream contents must be followed by 'endstream'
v = Tokenizer.GetToken();
ThrowOnEmptyOrError(v);
keyword = v as TokenKeyword;
if (keyword == null)
{
throw new ApplicationException($"Stream has missing 'endstream' after content.");
}
if (keyword.Value != ParseKeyword.EndStream)
{
throw new ApplicationException($"Stream has unexpected keyword {keyword.Value} instead of 'endstream'.");
}
// Stream contents must be followed by 'endobj'
v = Tokenizer.GetToken();
ThrowOnEmptyOrError(v);
keyword = v as TokenKeyword;
if (keyword == null)
{
throw new ApplicationException($"Indirect object has missing 'endobj'.");
}
if (keyword.Value != ParseKeyword.EndObj)
{
throw new ApplicationException($"Indirect object has unexpected keyword {keyword.Value} instead of 'endobj'.");
}
return(new ParseIndirectObject(t as TokenInteger, u as TokenInteger, new ParseStream(dictionary, bytes)));
}
else
{
throw new ApplicationException($"Indirect object has unexpected keyword {keyword.Value}.");
}
}