private void initNotAlphaIDAT(FileStream fs, string colorspace, int n)
{
if (Dictionary["ColorSpace"] == null)
{
Dictionary.AddItem("ColorSpace", new PDFName(colorspace));
}
if (_interface == 1)
{
MemoryStream compressionStream = new MemoryStream();
compressionStream.Position = 0;
writeIDAT(compressionStream, fs);
MemoryStream decodeStream = FlateDecoder.Decode(compressionStream, null);
if (_bitdepth == 16)
{
n *= 2;
}
byte[] pdfData = toPDFData(decodeStream, n);
GetStream().Write(pdfData, 0, pdfData.Length);
}
else
{
writeIDAT(GetStream(), fs);
PDFDictionary dict = new PDFDictionary();
dict.AddItem("Predictor", new PDFNumber(15));
dict.AddItem("Colors", new PDFNumber(n));
dict.AddItem("BitsPerComponent", new PDFNumber(_bitdepth));
dict.AddItem("Columns", new PDFNumber(_width));
Dictionary.AddItem("Filter", new PDFName("FlateDecode"));
Dictionary.AddItem("DecodeParms", dict);
}
}
private void initAlphaIDAT(FileStream fs, string colorspace, int n)
{
if (Dictionary["ColorSpace"] == null)
{
Dictionary.AddItem("ColorSpace", new PDFName(colorspace));
}
MemoryStream streamSMask = new MemoryStream();
PDFDictionaryStream dictSMask = new PDFDictionaryStream(new PDFDictionary(), streamSMask);
initSMask(dictSMask);
Dictionary.AddItem("SMask", dictSMask);
MemoryStream compressionStream = new MemoryStream();
compressionStream.Position = 0;
writeIDAT(compressionStream, fs);
MemoryStream decodeStream = FlateDecoder.Decode(compressionStream, null);
byte[] pdfData = toPDFData(decodeStream, (n + 1) * (_bitdepth / 8));
for (int i = 0; i < pdfData.Length; i += (n + 1) * (_bitdepth / 8))
{
GetStream().Write(pdfData, i, n * (_bitdepth / 8));
byte b = pdfData[i + n * (_bitdepth / 8)];
if (_bitdepth == 16)
{
b = (byte)((((int)b << 8) | (int)pdfData[i + n * (_bitdepth / 8) + 1]) / 256);
}
streamSMask.WriteByte(b);
}
}
private void initialize3IDAT(FileStream fs, long positionTRNS)
{
if (positionTRNS != 0)
{
long oldPosition = fs.Position;
fs.Position = positionTRNS;
byte[] buf = new byte[4];
fs.Read(buf, 0, buf.Length);
fs.Position += 4;
byte[] data = new byte[toInt32(buf)];
fs.Read(data, 0, data.Length);
fs.Position = oldPosition;
byte max = 0;
for (int i = 0; i < data.Length; ++i)
{
if (max < data[i])
{
max = data[i];
}
}
PDFArray array = new PDFArray();
array.AddItem(new PDFNumber(max));
array.AddItem(new PDFNumber(max));
Dictionary.AddItem("Mask", array);
}
if (_interface == 1)
{
MemoryStream compressionStream = new MemoryStream();
compressionStream.Position = 0;
writeIDAT(compressionStream, fs);
MemoryStream decodeStream = FlateDecoder.Decode(compressionStream, null);
byte[] pdfData = toPDFData(decodeStream, 1);
GetStream().Write(pdfData, 0, pdfData.Length);
}
else
{
writeIDAT(GetStream(), fs);
PDFDictionary dict = new PDFDictionary();
dict.AddItem("Predictor", new PDFNumber(15));
dict.AddItem("Colors", new PDFNumber(1));
dict.AddItem("BitsPerComponent", new PDFNumber(_bitdepth));
dict.AddItem("Columns", new PDFNumber(_width));
Dictionary.AddItem("Filter", new PDFName("FlateDecode"));
Dictionary.AddItem("DecodeParms", dict);
}
}
public void Decode()
{
Filter[] filters = getFilters();
if (filters.Length == 0)
{
return;
}
_stream.Position = 0;
try
{
for (int i = 0; i < filters.Length; ++i)
{
switch (filters[i])
{
case Filter.ASCII85:
_stream = ASCII85Decoder.Decode(_stream);
break;
case Filter.ASCIIHex:
_stream = ASCIIHexDecoder.Decode(_stream);
break;
case Filter.RunLength:
_stream = RunLengthDecoder.Decode(_stream);
break;
case Filter.JPX:
_stream = JPXDecoder.Decode(_stream);
break;
case Filter.CCITTFax:
_stream = CCITTFaxDecoder.Decode(_stream, getDecodeParameters(i));
break;
case Filter.DCT:
_stream = DCTDecoder.Decode(_stream, getDecodeParameters(i));
break;
case Filter.Flate:
_stream = FlateDecoder.Decode(_stream, getDecodeParameters(i));
break;
case Filter.JBIG2:
_stream = JBIG2Decoder.Decode(_stream, getDecodeParameters(i));
break;
case Filter.LZW:
_stream = LZWDecoder.Decode(_stream, getDecodeParameters(i));
break;
}
_stream.Position = 0;
}
}
catch
{
return;
}
_dictionary.RemoveItem("Filter");
_dictionary.RemoveItem("DecodeParms");
}
public void Write(SaveParameters param)
{
_stream.Position = 0;
MemoryStream output = _stream;
//set compression
bool filter = false;
if (param.Compression == Compression.Flate)
{
PDFName subtype = (PDFName)_dictionary["Subtype"];
Filter[] filters = getFilters();
if (subtype != null && subtype.GetValue() == "Image" && filters.Length > 0 && filters[0] == Filter.DCT)
{
output = param.Buffer;
output.SetLength(0);
_stream.WriteTo(output);
filter = true;
}
else if (param.Compression != Compression.None && getFilters().Length == 0)
{
output = param.Buffer;
output.SetLength(0);
FlateDecoder.Code(_stream, output);
_dictionary.AddItem("Filter", new PDFName("FlateDecode"));
filter = true;
}
}
//set encryption
if (param.Encryptor != null)
{
param.Encryptor.ResetObjectReference(param.ObjNo, param.GenNo, DataType.Stream);
if (filter)
{
byte[] buffer = output.GetBuffer();
int length = (int)output.Length;
output.SetLength(0);
param.Encryptor.Encrypt(buffer, 0, length, output, DataType.Stream);
}
else
{
output = param.Buffer;
output.SetLength(0);
param.Encryptor.Encrypt(_stream.GetBuffer(), 0, (int)_stream.Length, output, DataType.Stream);
}
}
output.Position = 0;
_dictionary.AddItem("Length", new PDFNumber(output.Length));
_dictionary.Write(param);
param.Stream.Write(StartStream, 0, StartStream.Length);
param.Stream.Write(output.GetBuffer(), 0, (int)output.Length);
param.Stream.Write(EndStream, 0, EndStream.Length);
if (filter)
{
_dictionary.RemoveItem("Filter");
}
}
