public static void Decode(IBuffer buffer, PdfDataObject filter, PdfDirectObject parameters)
{
if (filter is PdfName) // Single filter.
{
buffer.Decode(Filter.Get((PdfName)filter), (PdfDictionary)parameters);
}
else // Multiple filters.
{
IEnumerator <PdfDirectObject> filterIterator = ((PdfArray)filter).GetEnumerator();
IEnumerator <PdfDirectObject> parametersIterator = (parameters != null ? ((PdfArray)parameters).GetEnumerator() : null);
while (filterIterator.MoveNext())
{
PdfDictionary filterParameters;
if (parametersIterator == null)
{
filterParameters = null;
}
else
{
parametersIterator.MoveNext();
filterParameters = (PdfDictionary)Resolve(parametersIterator.Current);
}
buffer.Decode(Filter.Get((PdfName)Resolve(filterIterator.Current)), filterParameters);
}
}
}
/**
* <summary>Gets the stream body.</summary>
* <param name="decode">Defines whether the body has to be decoded.</param>
*/
public IBuffer GetBody(
bool decode
)
{
if (!bodyResolved)
{
/*
* NOTE: In case of stream data from external file, a copy to the local buffer has to be done.
*/
FileSpecification dataFile = DataFile;
if (dataFile != null)
{
Updateable = false;
body.SetLength(0);
body.Write(dataFile.GetInputStream());
body.Dirty = false;
Updateable = true;
}
bodyResolved = true;
}
if (decode)
{
PdfDataObject filter = Filter;
if (filter != null) // Stream encoded.
{
header.Updateable = false;
PdfDataObject parameters = Parameters;
if (filter is PdfName) // Single filter.
{
body.Decode(
bytes.filters.Filter.Get((PdfName)filter),
(PdfDictionary)parameters
);
}
else // Multiple filters.
{
IEnumerator <PdfDirectObject> filterIterator = ((PdfArray)filter).GetEnumerator();
IEnumerator <PdfDirectObject> parametersIterator = (parameters != null ? ((PdfArray)parameters).GetEnumerator() : null);
while (filterIterator.MoveNext())
{
PdfDictionary filterParameters;
if (parametersIterator == null)
{
filterParameters = null;
}
else
{
parametersIterator.MoveNext();
filterParameters = (PdfDictionary)Resolve(parametersIterator.Current);
}
body.Decode(bytes.filters.Filter.Get((PdfName)Resolve(filterIterator.Current)), filterParameters);
}
}
Filter = null; // The stream is free from encodings.
header.Updateable = true;
}
}
return(body);
}
/**
* <summary>Gets the stream body.</summary>
* <param name="decode">Defines whether the body has to be decoded.</param>
*/
public IBuffer GetBody(
bool decode
)
{
if (decode)
{
// Get 'Filter' entry!
/*
* NOTE: It defines possible encodings applied to the stream.
*/
PdfDirectObject filterObj = header[PdfName.Filter];
if (filterObj != null) // Stream encoded.
{
/*
* NOTE: If the stream is encoded, we must decode it before continuing.
*/
PdfDataObject filterDataObj = files.File.Resolve(filterObj);
PdfDataObject decodeParms = header.Resolve(PdfName.DecodeParms);
if (filterDataObj is PdfName) // PdfName.
{
PdfDictionary filterDecodeParms = (PdfDictionary)decodeParms;
body.Decode(Filter.Get((PdfName)filterDataObj), filterDecodeParms);
}
else // MUST be PdfArray.
{
IEnumerator <PdfDirectObject> filterObjIterator = ((PdfArray)filterDataObj).GetEnumerator();
IEnumerator <PdfDirectObject> decodeParmsIterator = (decodeParms != null ? ((PdfArray)decodeParms).GetEnumerator() : null);
while (filterObjIterator.MoveNext())
{
PdfDictionary filterDecodeParms;
if (decodeParmsIterator == null)
{
filterDecodeParms = null;
}
else
{
decodeParmsIterator.MoveNext();
filterDecodeParms = (PdfDictionary)files.File.Resolve(decodeParmsIterator.Current);
}
body.Decode(Filter.Get((PdfName)files.File.Resolve(filterObjIterator.Current)), filterDecodeParms);
}
}
// Update 'Filter' entry!
header[PdfName.Filter] = null; // The stream is free from encodings.
}
}
return(body);
}
