/**
* <summary>Gets the object equivalent to the given value.</summary>
*/
public static PdfDirectObject Get(
object value
)
{
if (value == null)
{
return(null);
}
if (value is int)
{
return(PdfInteger.Get((int)value));
}
if (value is double || value is float)
{
return(PdfReal.Get(value));
}
if (value is string)
{
return(PdfTextString.Get((string)value));
}
if (value is DateTime)
{
return(PdfDate.Get((DateTime)value));
}
if (value is bool)
{
return(PdfBoolean.Get((bool)value));
}
throw new NotImplementedException();
}
/**
* <summary>Parses the current PDF object [PDF:1.6:3.2].</summary>
*/
public virtual PdfDataObject ParsePdfObject(
)
{
switch (TokenType)
{
case TokenTypeEnum.Integer:
return(PdfInteger.Get((int)Token));
case TokenTypeEnum.Name:
return(new PdfName((string)Token, true));
case TokenTypeEnum.DictionaryBegin:
{
PdfDictionary dictionary = new PdfDictionary();
dictionary.Updateable = false;
while (true)
{
// Key.
MoveNext(); if (TokenType == TokenTypeEnum.DictionaryEnd)
{
break;
}
PdfName key = (PdfName)ParsePdfObject();
// Value.
MoveNext();
PdfDirectObject value = (PdfDirectObject)ParsePdfObject();
// Add the current entry to the dictionary!
dictionary[key] = value;
}
dictionary.Updateable = true;
return(dictionary);
}
case TokenTypeEnum.ArrayBegin:
{
PdfArray array = new PdfArray();
array.Updateable = false;
while (true)
{
// Value.
MoveNext(); if (TokenType == TokenTypeEnum.ArrayEnd)
{
break;
}
// Add the current item to the array!
array.Add((PdfDirectObject)ParsePdfObject());
}
array.Updateable = true;
return(array);
}
case TokenTypeEnum.Literal:
if (Token is DateTime)
{
return(PdfDate.Get((DateTime)Token));
}
else
{
return(new PdfTextString(
Encoding.Pdf.Encode((string)Token)
));
}
case TokenTypeEnum.Hex:
return(new PdfTextString(
(string)Token,
PdfString.SerializationModeEnum.Hex
));
case TokenTypeEnum.Real:
return(PdfReal.Get((double)Token));
case TokenTypeEnum.Boolean:
return(PdfBoolean.Get((bool)Token));
case TokenTypeEnum.Null:
return(null);
default:
throw new PostScriptParseException(String.Format("Unknown type beginning: '{0}'", Token), this);
}
}
/**
* <remarks>
* <para>Require[0]: when this method is invoked, the pointer MUST be at (the end of) the first
* token of the object.</para>
* <para>Ensure[0]: when this method terminates, the pointer IS at (the end of) the last token of the object.</para>
* <para>Invariant[0]: stream data IS kept untouched.</para>
* <para>Side effect[0]: see Ensure[0].</para>
* </remarks>
*/
public PdfDirectObject ParsePdfObject(
)
{
do
{
switch (tokenType)
{
case TokenTypeEnum.Integer:
return(new PdfInteger((int)token));
case TokenTypeEnum.Name:
return(new PdfName((string)token, true));
case TokenTypeEnum.Literal:
return(new PdfString(
org.pdfclown.tokens.Encoding.Encode((string)token),
PdfString.SerializationModeEnum.Literal
));
case TokenTypeEnum.DictionaryBegin:
PdfDictionary dictionary = new PdfDictionary();
// Populate the dictionary.
while (true)
{
// Key.
MoveNext();
if (tokenType == TokenTypeEnum.DictionaryEnd)
{
break;
}
PdfName key = (PdfName)ParsePdfObject();
// Value.
MoveNext();
PdfDirectObject value = (PdfDirectObject)ParsePdfObject();
// Add the current entry to the dictionary!
dictionary[key] = value;
}
return(dictionary);
case TokenTypeEnum.ArrayBegin:
PdfArray array = new PdfArray();
// Populate the array.
while (true)
{
// Value.
MoveNext();
if (tokenType == TokenTypeEnum.ArrayEnd)
{
break;
}
// Add the current item to the array!
array.Add((PdfDirectObject)ParsePdfObject());
}
return(array);
case TokenTypeEnum.Real:
return(new PdfReal((float)token));
case TokenTypeEnum.Boolean:
return(PdfBoolean.Get((bool)token));
case TokenTypeEnum.Date:
return(new PdfDate((DateTime)token));
case TokenTypeEnum.Hex:
return(new PdfString(
(string)token,
PdfString.SerializationModeEnum.Hex
));
case TokenTypeEnum.Null:
return(null);
case TokenTypeEnum.Comment:
// NOOP: Comments are simply ignored and skipped.
break;
default:
throw new Exception("Unknown type: " + tokenType);
}
} while(MoveNext());
return(null);
}
/**
* <summary>Parses the current PDF object [PDF:1.6:3.2].</summary>
*/
public PdfDataObject ParsePdfObject(
)
{
/*
* NOTE: Object parsing is intrinsically a sequential operation tied to the stream pointer.
* Calls bound towards other classes are potentially disruptive for the predictability of
* the position of the stream pointer, so we are forced to carefully keep track of our
* current position in order to recover its proper state after any outbound call.
*/
do
{
// Which token type?
switch (tokenType)
{
case TokenTypeEnum.Integer:
return(new PdfInteger((int)token));
case TokenTypeEnum.Name:
return(new PdfName((string)token, true));
case TokenTypeEnum.Reference:
/*
* NOTE: Curiously, PDF references are the only primitive objects that require
* a file reference. That's because they deal with indirect objects, which are strongly
* coupled with the current state of the file: so, PDF references are the fundamental
* bridge between the token layer and the file layer.
*/
return(new PdfReference(
(Reference)token,
file
));
case TokenTypeEnum.Literal:
return(new PdfTextString(
Encoding.Encode((string)token)
));
case TokenTypeEnum.DictionaryBegin:
PdfDictionary dictionary = new PdfDictionary();
while (true)
{
// Key.
MoveNext(); if (tokenType == TokenTypeEnum.DictionaryEnd)
{
break;
}
PdfName key = (PdfName)ParsePdfObject();
// Value.
MoveNext();
PdfDirectObject value = (PdfDirectObject)ParsePdfObject();
// Add the current entry to the dictionary!
dictionary[key] = value;
}
int oldOffset = (int)stream.Position;
MoveNext();
// Is this dictionary the header of a stream object [PDF:1.6:3.2.7]?
if ((tokenType == TokenTypeEnum.Keyword) &&
token.Equals(Keyword.BeginStream))
{
// Keep track of current position!
long position = stream.Position;
// Get the stream length!
/*
* NOTE: Indirect reference resolution is an outbound call (stream pointer hazard!),
* so we need to recover our current position after it returns.
*/
int length = ((PdfInteger)files.File.Resolve(dictionary[PdfName.Length])).RawValue;
// Move to the stream data beginning!
stream.Seek(position); SkipEOL();
// Copy the stream data to the instance!
byte[] data = new byte[length];
stream.Read(data);
MoveNext(); // Postcondition (last token should be 'endstream' keyword).
Object streamType = dictionary[PdfName.Type];
if (PdfName.ObjStm.Equals(streamType)) // Object stream [PDF:1.6:3.4.6].
{
return(new ObjectStream(
dictionary,
new bytes.Buffer(data),
file
));
}
else if (PdfName.XRef.Equals(streamType)) // Cross-reference stream [PDF:1.6:3.4.7].
{
return(new XRefStream(
dictionary,
new bytes.Buffer(data),
file
));
}
else // Generic stream.
{
return(new PdfStream(
dictionary,
new bytes.Buffer(data)
));
}
}
else // Stand-alone dictionary.
{
stream.Seek(oldOffset); // Restores postcondition (last token should be the dictionary end).
return(dictionary);
}
case TokenTypeEnum.ArrayBegin:
PdfArray array = new PdfArray();
while (true)
{
// Value.
MoveNext(); if (tokenType == TokenTypeEnum.ArrayEnd)
{
break;
}
// Add the current item to the array!
array.Add((PdfDirectObject)ParsePdfObject());
}
return(array);
case TokenTypeEnum.Real:
return(new PdfReal((float)token));
case TokenTypeEnum.Boolean:
return(PdfBoolean.Get((bool)token));
case TokenTypeEnum.Date:
return(new PdfDate((DateTime)token));
case TokenTypeEnum.Hex:
return(new PdfTextString(
(string)token,
PdfString.SerializationModeEnum.Hex
));
case TokenTypeEnum.Null:
return(null);
case TokenTypeEnum.Comment:
// NOOP: Comments are simply ignored and skipped.
break;
default:
throw new Exception("Unknown type: " + tokenType);
}
} while(MoveNext());
return(null);
}
public static PdfBoolean NextPdfBoolean(this Random rnd)
{
return(PdfBoolean.Get(rnd.NextBoolean()));
}
