public Segment(JBIG2StreamDecoder streamDecoder)
{
this.decoder = streamDecoder;
huffmanDecoder = decoder.GetHuffmanDecoder();
arithmeticDecoder = decoder.GetArithmeticDecoder();
mmrDecoder = decoder.GetMMRDecoder();
}
public byte[] DecodeJBIG2(byte[] data, ImageFormat format = ImageFormat.TIFF, int NewWidth = 0, int NewHeight = 0)
{
reader = new Big2StreamReader(data);
ResetDecoder();
bool validFile = CheckHeader();
if (JBIG2StreamDecoder.debug)
{
Console.WriteLine("validFile = " + validFile);
}
if (!validFile)
{
/**
* Assume this is a stream from a PDF so there is no file header,
* end of page segments, or end of file segments. Organisation must
* be sequential, and the number of pages is assumed to be 1.
*/
noOfPagesKnown = true;
randomAccessOrganisation = false;
noOfPages = 1;
/** check to see if there is any global data to be read */
if (globalData != null)
{
/** set the reader to read from the global data */
reader = new Big2StreamReader(globalData);
huffmanDecoder = new HuffmanDecoder(reader);
mmrDecoder = new MMRDecoder(reader);
arithmeticDecoder = new ArithmeticDecoder(reader);
/** read in the global data segments */
ReadSegments();
/** set the reader back to the main data */
reader = new Big2StreamReader(data);
}
else
{
/**
* There's no global data, so move the file pointer back to the
* start of the stream
*/
reader.MovePointer(-8);
}
}
else
{
/**
* We have the file header, so assume it is a valid stand-alone
* file.
*/
if (JBIG2StreamDecoder.debug)
{
Console.WriteLine("==== File Header ====");
}
SetFileHeaderFlags();
if (JBIG2StreamDecoder.debug)
{
Console.WriteLine("randomAccessOrganisation = " + randomAccessOrganisation);
Console.WriteLine("noOfPagesKnown = " + noOfPagesKnown);
}
if (noOfPagesKnown)
{
noOfPages = GetNoOfPages();
if (JBIG2StreamDecoder.debug)
{
Console.WriteLine("noOfPages = " + noOfPages);
}
}
}
huffmanDecoder = new HuffmanDecoder(reader);
mmrDecoder = new MMRDecoder(reader);
arithmeticDecoder = new ArithmeticDecoder(reader);
/** read in the main segment data */
ReadSegments();
//Create Image
var rawimage = FindPageSegement(1).GetPageBitmap();
int width = (int)rawimage.GetWidth();
int height = (int)rawimage.GetHeight();
var dataStream = rawimage.GetData(true);
int stride = (width * 1 + 7) / 8;
// This section is new for .net standard 2.0
var bmp = BitsToImage(dataStream, width, height, stride, format);
if (NewWidth != 0 && NewHeight != 0)
{
var newbitmap = ResizeHelpers.ScaleImage(bmp, NewWidth, NewHeight);
return(newbitmap);
}
return(bmp);
}
public override void ReadSegment()
{
if (JBIG2StreamDecoder.debug)
{
Console.WriteLine("==== Reading Text Region ====");
}
base.ReadSegment();
/** read text region Segment flags */
ReadTextRegionFlags();
short[] buff = new short[4];
decoder.Readbyte(buff);
long noOfSymbolInstances = BinaryOperation.GetInt32(buff);
if (JBIG2StreamDecoder.debug)
{
Console.WriteLine("noOfSymbolInstances = " + noOfSymbolInstances);
}
int noOfReferredToSegments = segmentHeader.GetReferredToSegmentCount();
int[] referredToSegments = segmentHeader.GetReferredToSegments();
//List codeTables = new ArrayList();
List <Segment> segmentsReferenced = new List <Segment>();
long noOfSymbols = 0;
if (JBIG2StreamDecoder.debug)
{
Console.WriteLine("noOfReferredToSegments = " + noOfReferredToSegments);
}
int i; // i = 0;
for (i = 0; i < noOfReferredToSegments; i++)
{
Segment seg = decoder.FindSegment(referredToSegments[i]);
int type = seg.GetSegmentHeader().GetSegmentType();
if (type == Segment.SYMBOL_DICTIONARY)
{
segmentsReferenced.Add(seg);
noOfSymbols += ((SymbolDictionarySegment)seg).GetNoOfExportedSymbols();
}
else if (type == Segment.TABLES)
{
//codeTables.add(seg);
}
}
long symbolCodeLength = 0;
int count = 1;
while (count < noOfSymbols)
{
symbolCodeLength++;
count <<= 1;
}
int currentSymbol = 0;
JBIG2Bitmap[] symbols = new JBIG2Bitmap[noOfSymbols];
foreach (Segment it in segmentsReferenced)
{
if (it.GetSegmentHeader().GetSegmentType() == Segment.SYMBOL_DICTIONARY)
{
JBIG2Bitmap[] bitmaps = ((SymbolDictionarySegment)it).GetBitmaps();
for (int j = 0; j < bitmaps.Length; j++)
{
symbols[currentSymbol] = bitmaps[j];
currentSymbol++;
}
}
}
long[,] huffmanFSTable = null;
long[,] huffmanDSTable = null;
long[,] huffmanDTTable = null;
long[,] huffmanRDWTable = null;
long[,] huffmanRDHTable = null;
long[,] huffmanRDXTable = null;
long[,] huffmanRDYTable = null;
long[,] huffmanRSizeTable = null;
bool sbHuffman = textRegionFlags.GetFlagValue(TextRegionFlags.SB_HUFF) != 0;
i = 0;
if (sbHuffman)
{
int sbHuffFS = textRegionHuffmanFlags.GetFlagValue(TextRegionHuffmanFlags.SB_HUFF_FS);
if (sbHuffFS == 0)
{
huffmanFSTable = HuffmanDecoder.huffmanTableF;
}
else if (sbHuffFS == 1)
{
huffmanFSTable = HuffmanDecoder.huffmanTableG;
}
else
{
}
int sbHuffDS = textRegionHuffmanFlags.GetFlagValue(TextRegionHuffmanFlags.SB_HUFF_DS);
if (sbHuffDS == 0)
{
huffmanDSTable = HuffmanDecoder.huffmanTableH;
}
else if (sbHuffDS == 1)
{
huffmanDSTable = HuffmanDecoder.huffmanTableI;
}
else if (sbHuffDS == 2)
{
huffmanDSTable = HuffmanDecoder.huffmanTableJ;
}
else
{
}
int sbHuffDT = textRegionHuffmanFlags.GetFlagValue(TextRegionHuffmanFlags.SB_HUFF_DT);
if (sbHuffDT == 0)
{
huffmanDTTable = HuffmanDecoder.huffmanTableK;
}
else if (sbHuffDT == 1)
{
huffmanDTTable = HuffmanDecoder.huffmanTableL;
}
else if (sbHuffDT == 2)
{
huffmanDTTable = HuffmanDecoder.huffmanTableM;
}
else
{
}
int sbHuffRDW = textRegionHuffmanFlags.GetFlagValue(TextRegionHuffmanFlags.SB_HUFF_RDW);
if (sbHuffRDW == 0)
{
huffmanRDWTable = HuffmanDecoder.huffmanTableN;
}
else if (sbHuffRDW == 1)
{
huffmanRDWTable = HuffmanDecoder.huffmanTableO;
}
else
{
}
int sbHuffRDH = textRegionHuffmanFlags.GetFlagValue(TextRegionHuffmanFlags.SB_HUFF_RDH);
if (sbHuffRDH == 0)
{
huffmanRDHTable = HuffmanDecoder.huffmanTableN;
}
else if (sbHuffRDH == 1)
{
huffmanRDHTable = HuffmanDecoder.huffmanTableO;
}
else
{
}
int sbHuffRDX = textRegionHuffmanFlags.GetFlagValue(TextRegionHuffmanFlags.SB_HUFF_RDX);
if (sbHuffRDX == 0)
{
huffmanRDXTable = HuffmanDecoder.huffmanTableN;
}
else if (sbHuffRDX == 1)
{
huffmanRDXTable = HuffmanDecoder.huffmanTableO;
}
else
{
}
int sbHuffRDY = textRegionHuffmanFlags.GetFlagValue(TextRegionHuffmanFlags.SB_HUFF_RDY);
if (sbHuffRDY == 0)
{
huffmanRDYTable = HuffmanDecoder.huffmanTableN;
}
else if (sbHuffRDY == 1)
{
huffmanRDYTable = HuffmanDecoder.huffmanTableO;
}
else
{
}
int sbHuffRSize = textRegionHuffmanFlags.GetFlagValue(TextRegionHuffmanFlags.SB_HUFF_RSIZE);
if (sbHuffRSize == 0)
{
huffmanRSizeTable = HuffmanDecoder.huffmanTableA;
}
else
{
}
}
long[][] runLengthTable = new long[36][];
long[][] symbolCodeTable = new long[noOfSymbols + 1][];
if (sbHuffman)
{
decoder.ConsumeRemainingBits();
for (i = 0; i < 32; i++)
{
runLengthTable[i] = new long[] { i, decoder.ReadBits(4), 0, 0 };
}
runLengthTable[32] = new long[] { 0x103, decoder.ReadBits(4), 2, 0 };
runLengthTable[33] = new long[] { 0x203, decoder.ReadBits(4), 3, 0 };
runLengthTable[34] = new long[] { 0x20b, decoder.ReadBits(4), 7, 0 };
runLengthTable[35] = new long[] { 0, 0, HuffmanDecoder.jbig2HuffmanEOT };
runLengthTable = HuffmanDecoder.BuildTable(runLengthTable, 35);
for (i = 0; i < noOfSymbols; i++)
{
symbolCodeTable[i] = new long[] { i, 0, 0, 0 };
}
i = 0;
while (i < noOfSymbols)
{
long j = huffmanDecoder.DecodeInt(runLengthTable).IntResult();
if (j > 0x200)
{
for (j -= 0x200; j != 0 && i < noOfSymbols; j--)
{
symbolCodeTable[i++][1] = 0;
}
}
else if (j > 0x100)
{
for (j -= 0x100; j != 0 && i < noOfSymbols; j--)
{
symbolCodeTable[i][1] = symbolCodeTable[i - 1][1];
i++;
}
}
else
{
symbolCodeTable[i++][1] = j;
}
}
symbolCodeTable[noOfSymbols][1] = 0;
symbolCodeTable[noOfSymbols][2] = HuffmanDecoder.jbig2HuffmanEOT;
symbolCodeTable = HuffmanDecoder.BuildTable(symbolCodeTable, (int)noOfSymbols);
decoder.ConsumeRemainingBits();
}
else
{
symbolCodeTable = null;
arithmeticDecoder.ResetIntStats((int)symbolCodeLength);
arithmeticDecoder.Start();
}
bool symbolRefine = textRegionFlags.GetFlagValue(TextRegionFlags.SB_REFINE) != 0;
long logStrips = textRegionFlags.GetFlagValue(TextRegionFlags.LOG_SB_STRIPES);
int defaultPixel = textRegionFlags.GetFlagValue(TextRegionFlags.SB_DEF_PIXEL);
int combinationOperator = textRegionFlags.GetFlagValue(TextRegionFlags.SB_COMB_OP);
bool transposed = textRegionFlags.GetFlagValue(TextRegionFlags.TRANSPOSED) != 0;
int referenceCorner = textRegionFlags.GetFlagValue(TextRegionFlags.REF_CORNER);
int sOffset = textRegionFlags.GetFlagValue(TextRegionFlags.SB_DS_OFFSET);
int template = textRegionFlags.GetFlagValue(TextRegionFlags.SB_R_TEMPLATE);
if (symbolRefine)
{
arithmeticDecoder.ResetRefinementStats(template, null);
}
JBIG2Bitmap bitmap = new JBIG2Bitmap(regionBitmapWidth, regionBitmapHeight, arithmeticDecoder, huffmanDecoder, mmrDecoder);
bitmap.ReadTextRegion2(sbHuffman, symbolRefine, noOfSymbolInstances, logStrips, noOfSymbols, symbolCodeTable, symbolCodeLength, symbols, defaultPixel, combinationOperator, transposed, referenceCorner, sOffset, huffmanFSTable, huffmanDSTable, huffmanDTTable, huffmanRDWTable, huffmanRDHTable, huffmanRDXTable, huffmanRDYTable, huffmanRSizeTable, template, symbolRegionAdaptiveTemplateX, symbolRegionAdaptiveTemplateY, decoder);
if (inlineImage)
{
PageInformationSegment pageSegment = decoder.FindPageSegement(segmentHeader.GetPageAssociation());
JBIG2Bitmap pageBitmap = pageSegment.GetPageBitmap();
if (JBIG2StreamDecoder.debug)
{
Console.WriteLine(pageBitmap + " " + bitmap);
}
int externalCombinationOperator = regionFlags.GetFlagValue(RegionFlags.EXTERNAL_COMBINATION_OPERATOR);
pageBitmap.Combine(bitmap, regionBitmapXLocation, regionBitmapYLocation, externalCombinationOperator);
}
else
{
bitmap.SetBitmapNumber(GetSegmentHeader().GetSegmentNumber());
decoder.AppendBitmap(bitmap);
}
decoder.ConsumeRemainingBits();
}