public void ReadDictionary(PdfStream st)
{
if (st.Expect("<<", false))
{
// Until we get to the end of this dictionary
while (st.PeekBlock(2) != ">>")
{
// Consume any leading whitespace
while (Utility.IsWhite(st.PeekBlock(1)))
{
st.ReadBlock(1);
}
// Name
Utility.TraceLine("Checking for a name");
string name = st.RegexMatch("^(/[^ \t/\\[\\]\\(\\)\\<\\>]+)[ \t]*");
if (name == "")
{
throw new ParseException("Dictionary items must have a name");
}
st.ConsumeWhitespace();
// Value
if (st.PeekBlock(2) == "<<")
{
Utility.TraceLine("Traversing subdictionary");
Dictionary dict = new Dictionary();
dict.ReadDictionary(st);
DictionaryItem di = new DictionaryItem(name, dict);
Add(di);
}
else
{
Utility.TraceLine("Finding the value");
string nameval = st.RegexMatch("^(/[^ \t/\\[\\]\\(\\)\\<\\>]+)", false);
string objrefval = st.RegexMatch("^([0-9]+ [0-9]+ R)", false);
string numval = st.RegexMatch("^(-{0,1}[0-9]+)", false);
string floatval = st.RegexMatch("^(-{0,1}[0-9]+\\.[0-9]+)", false);
// The old version of these:
//string rdbrackets = st.RegexMatch("^(\\([^\\)]*\\)+)[ \t]*", false);
string sqbrackets = st.RegexMatch(@"^(\[.*?[^\\]+?\])", false);
string rdbrackets = st.RegexMatch(@"^(\(.*?[^\\]+?\))", false);
string anbrackets = st.RegexMatch(@"^(\<.*?[^\\]+?\>)", false);
string singleword = st.RegexMatch("^([^ \t]+)", false);
if (nameval != "")
{
DictionaryItem di = new DictionaryItem(name, nameval);
Add(di);
st.ReadBlock(nameval.Length);
}
else if (objrefval != "")
{
DictionaryItem di = new DictionaryItem(name, objrefval);
Add(di);
st.ReadBlock(objrefval.Length);
}
else if (floatval != "")
{
DictionaryItem di = new DictionaryItem(name, floatval);
Add(di);
st.ReadBlock(floatval.Length);
}
else if (numval != "")
{
DictionaryItem di = new DictionaryItem(name, numval);
Add(di);
st.ReadBlock(numval.Length);
}
else if (sqbrackets != "")
{
DictionaryItem di = new DictionaryItem(name, sqbrackets);
Add(di);
st.ReadBlock(sqbrackets.Length);
}
else if (rdbrackets != "")
{
DictionaryItem di = new DictionaryItem(name, rdbrackets);
Add(di);
st.ReadBlock(rdbrackets.Length);
}
else if (anbrackets != "")
{
DictionaryItem di = new DictionaryItem(name, anbrackets);
Add(di);
st.ReadBlock(anbrackets.Length);
}
else if (singleword != "")
{
DictionaryItem di = new DictionaryItem(name, singleword);
Add(di);
st.ReadBlock(singleword.Length);
}
else
{
throw new ParseException("Unknown value format: " + st.PeekLine());
}
}
st.ConsumeWhitespace();
}
// Skip over the >> at the end of the dictionary
st.ReadBlock(2);
st.ConsumeWhitespace();
}
}
public Pdf(string filename)
{
PdfStream st = new PdfStream();
st.FillFromFile(filename);
long pos = st.Position;
ReadHeader(st);
// While we're still advancing through the stream, then all is good...
bool eof = false;
while (!eof && (st.Position != pos))
{
Utility.TraceLine("Starting read pass");
pos = st.Position;
ReadComment(st);
Object obj = ReadObject(st);
if (obj.Valid)
{
m_objects.Add(obj);
if (m_objects.Count == 1)
{
DictionaryItem di = obj.Dictionary.Get("Linearized");
if (di.Valid)
{
if (di.Type == DictionaryItem.ValueType.Number)
{
if (di.ValueAsInteger() == 1)
{
m_linflag = true;
m_linearized = true;
Utility.TraceLine("Linearized PDF document found");
Utility.TraceLine("PDF/A: Linearization of document is ignored (section 5.10)");
}
}
else
{
throw new ParseException("Linearized dictionary item is not a number");
}
}
}
}
ReadXref(st);
if (ReadTrailer(st))
{
if (m_linflag == true)
{
m_linflag = false;
Utility.TraceLine("Linearization trailer");
}
else
{
eof = true;
}
}
ReadStartXref(st);
if (!eof && (st.Position == pos))
{
st.ReadLine();
}
}
if (st.Position != st.Length)
{
m_pdfa = false;
Utility.TraceLine("PDF/A: Extraneous content after EOF marker breaches section 5.3 requirements");
}
}