public long DecodeIAID(long codeLen, ArithmeticDecoderStats stats)
{
previous = 1;
for (long i = 0; i < codeLen; i++)
{
int bit = DecodeBit(previous, stats);
previous = BinaryOperation.Bit32ShiftL(previous, 1) | bit;
}
return(previous - (1 << (int)codeLen));
}
public void Start()
{
buffer0 = reader.Readbyte();
buffer1 = reader.Readbyte();
c = BinaryOperation.Bit32ShiftL((buffer0 ^ 0xff), 16);
Readbyte();
c = BinaryOperation.Bit32ShiftL(c, 7);
counter -= 7;
a = 0x80000000l;
}
public long Get24Bits()
{
while (bufferLength < 24)
{
buffer = ((BinaryOperation.Bit32ShiftL(buffer, 8)) | (reader.Readbyte() & 0xff));
bufferLength += 8;
noOfbytesRead++;
}
return((BinaryOperation.Bit32ShiftR(buffer, (int)(bufferLength - 24))) & 0xffffff);
}
public int Get2DCode()
{
int tuple0, tuple1;
if (bufferLength == 0)
{
buffer = (reader.Readbyte() & 0xff);
bufferLength = 8;
noOfbytesRead++;
int lookup = (int)((BinaryOperation.Bit32ShiftR(buffer, 1)) & 0x7f);
tuple0 = twoDimensionalTable1[lookup, 0];
tuple1 = twoDimensionalTable1[lookup, 1];
}
else if (bufferLength == 8)
{
int lookup = (int)((BinaryOperation.Bit32ShiftR(buffer, 1)) & 0x7f);
tuple0 = twoDimensionalTable1[lookup, 0];
tuple1 = twoDimensionalTable1[lookup, 1];
}
else
{
int lookup = (int)((BinaryOperation.Bit32ShiftL(buffer, (int)(7 - bufferLength))) & 0x7f);
tuple0 = twoDimensionalTable1[lookup, 0];
tuple1 = twoDimensionalTable1[lookup, 1];
if (tuple0 < 0 || tuple0 > (int)bufferLength)
{
int right = (reader.Readbyte() & 0xff);
long left = (BinaryOperation.Bit32ShiftL(buffer, 8));
buffer = left | right;
bufferLength += 8;
noOfbytesRead++;
int look = (int)(BinaryOperation.Bit32ShiftR(buffer, (int)(bufferLength - 7)) & 0x7f);
tuple0 = twoDimensionalTable1[look, 0];
tuple1 = twoDimensionalTable1[look, 1];
}
}
if (tuple0 < 0)
{
return(0);
}
bufferLength -= tuple0;
return(tuple1);
}
private void HandleSegmentNumber(SegmentHeader segmentHeader)
{
short[] segmentbytes = new short[4];
reader.Readbyte(segmentbytes);
int segmentNumber = BinaryOperation.GetInt32(segmentbytes);
if (JBIG2StreamDecoder.debug)
{
Console.WriteLine("SegmentNumber = " + segmentNumber);
}
segmentHeader.SetSegmentNumber(segmentNumber);
}
private int DecodeIntBit(ArithmeticDecoderStats stats)
{
int bit = DecodeBit(previous, stats);
if (previous < 0x100)
{
previous = BinaryOperation.Bit32ShiftL(previous, 1) | bit;
}
else
{
previous = (((BinaryOperation.Bit32ShiftL(previous, 1)) | bit) & 0x1ff) | 0x100;
}
return(bit);
}
private void HandleSegmentDataLength(SegmentHeader segmentHeader)
{
short[] buf = new short[4];
reader.Readbyte(buf);
int dateLength = BinaryOperation.GetInt32(buf);
segmentHeader.SetDataLength(dateLength);
if (JBIG2StreamDecoder.debug)
{
Console.WriteLine("dateLength = " + dateLength);
}
}
private void HandleReferedToSegmentNumbers(SegmentHeader segmentHeader)
{
int referredToSegmentCount = segmentHeader.GetReferredToSegmentCount();
int[] referredToSegments = new int[referredToSegmentCount];
int segmentNumber = segmentHeader.GetSegmentNumber();
if (segmentNumber <= 256)
{
for (int i = 0; i < referredToSegmentCount; i++)
{
referredToSegments[i] = reader.Readbyte();
}
}
else if (segmentNumber <= 65536)
{
short[] buf = new short[2];
for (int i = 0; i < referredToSegmentCount; i++)
{
reader.Readbyte(buf);
referredToSegments[i] = BinaryOperation.GetInt16(buf);
}
}
else
{
short[] buf = new short[4];
for (int i = 0; i < referredToSegmentCount; i++)
{
reader.Readbyte(buf);
referredToSegments[i] = BinaryOperation.GetInt32(buf);
}
}
segmentHeader.SetReferredToSegments(referredToSegments);
if (JBIG2StreamDecoder.debug)
{
Console.WriteLine("referredToSegments = ");
for (int i = 0; i < referredToSegments.Length; i++)
{
Console.WriteLine(referredToSegments[i] + " ");
}
Console.WriteLine("");
}
}
private void ReadTextRegionFlags()
{
/** extract text region Segment flags */
short[] textRegionFlagsField = new short[2];
decoder.Readbyte(textRegionFlagsField);
int flags = BinaryOperation.GetInt16(textRegionFlagsField);
textRegionFlags.SetFlags(flags);
if (JBIG2StreamDecoder.debug)
{
Console.WriteLine("text region Segment flags = " + flags);
}
bool sbHuff = textRegionFlags.GetFlagValue(TextRegionFlags.SB_HUFF) != 0;
if (sbHuff)
{
/** extract text region Segment Huffman flags */
short[] textRegionHuffmanFlagsField = new short[2];
decoder.Readbyte(textRegionHuffmanFlagsField);
flags = BinaryOperation.GetInt16(textRegionHuffmanFlagsField);
textRegionHuffmanFlags.SetFlags(flags);
if (JBIG2StreamDecoder.debug)
{
Console.WriteLine("text region segment Huffman flags = " + flags);
}
}
bool sbRefine = textRegionFlags.GetFlagValue(TextRegionFlags.SB_REFINE) != 0;
int sbrTemplate = textRegionFlags.GetFlagValue(TextRegionFlags.SB_R_TEMPLATE);
if (sbRefine && sbrTemplate == 0)
{
symbolRegionAdaptiveTemplateX[0] = ReadATValue();
symbolRegionAdaptiveTemplateY[0] = ReadATValue();
symbolRegionAdaptiveTemplateX[1] = ReadATValue();
symbolRegionAdaptiveTemplateY[1] = ReadATValue();
}
}
public override void ReadSegment()
{
short[] buff = new short[4];
decoder.Readbyte(buff);
regionBitmapWidth = BinaryOperation.GetInt32(buff);
buff = new short[4];
decoder.Readbyte(buff);
regionBitmapHeight = BinaryOperation.GetInt32(buff);
if (JBIG2StreamDecoder.debug)
{
Console.WriteLine("Bitmap size = " + regionBitmapWidth + 'x' + regionBitmapHeight);
}
buff = new short[4];
decoder.Readbyte(buff);
regionBitmapXLocation = BinaryOperation.GetInt32(buff);
buff = new short[4];
decoder.Readbyte(buff);
regionBitmapYLocation = BinaryOperation.GetInt32(buff);
if (JBIG2StreamDecoder.debug)
{
Console.WriteLine("Bitmap location = " + regionBitmapXLocation + ',' + regionBitmapYLocation);
}
/** extract region Segment flags */
short regionFlagsField = decoder.Readbyte();
regionFlags.SetFlags(regionFlagsField);
if (JBIG2StreamDecoder.debug)
{
Console.WriteLine("region Segment flags = " + regionFlagsField);
}
}
private void Readbyte()
{
if (buffer0 == 0xff)
{
if (buffer1 > 0x8f)
{
counter = 8;
}
else
{
buffer0 = buffer1;
buffer1 = reader.Readbyte();
c = c + 0xfe00 - (BinaryOperation.Bit32ShiftL(buffer0, 9));
counter = 7;
}
}
else
{
buffer0 = buffer1;
buffer1 = reader.Readbyte();
c = c + 0xff00 - (BinaryOperation.Bit32ShiftL(buffer0, 8));
counter = 8;
}
}
private void HandlePageAssociation(SegmentHeader segmentHeader)
{
int pageAssociation;
bool isPageAssociationSizeSet = segmentHeader.IsPageAssociationSizeSet();
if (isPageAssociationSizeSet)
{ // field is 4 bytes long
short[] buf = new short[4];
reader.Readbyte(buf);
pageAssociation = BinaryOperation.GetInt32(buf);
}
else
{ // field is 1 byte long
pageAssociation = reader.Readbyte();
}
segmentHeader.SetPageAssociation(pageAssociation);
if (JBIG2StreamDecoder.debug)
{
Console.WriteLine("pageAssociation = " + pageAssociation);
}
}
public override void ReadSegment()
{
if (JBIG2StreamDecoder.debug)
{
Console.WriteLine("==== Reading Page Information Dictionary ====");
}
short[] buff = new short[4];
decoder.Readbyte(buff);
pageBitmapWidth = BinaryOperation.GetInt32(buff);
buff = new short[4];
decoder.Readbyte(buff);
pageBitmapHeight = BinaryOperation.GetInt32(buff);
if (JBIG2StreamDecoder.debug)
{
Console.WriteLine("Bitmap size = " + pageBitmapWidth + 'x' + pageBitmapHeight);
}
buff = new short[4];
decoder.Readbyte(buff);
xResolution = BinaryOperation.GetInt32(buff);
buff = new short[4];
decoder.Readbyte(buff);
yResolution = BinaryOperation.GetInt32(buff);
if (JBIG2StreamDecoder.debug)
{
Console.WriteLine("Resolution = " + xResolution + 'x' + yResolution);
}
/** extract page information flags */
short pageInformationFlagsField = decoder.Readbyte();
pageInformationFlags.SetFlags(pageInformationFlagsField);
if (JBIG2StreamDecoder.debug)
{
Console.WriteLine("symbolDictionaryFlags = " + pageInformationFlagsField);
}
buff = new short[2];
decoder.Readbyte(buff);
pageStriping = BinaryOperation.GetInt16(buff);
if (JBIG2StreamDecoder.debug)
{
Console.WriteLine("Page Striping = " + pageStriping);
}
int defPix = pageInformationFlags.GetFlagValue(PageInformationFlags.DEFAULT_PIXEL_VALUE);
int height;
if (pageBitmapHeight == -1)
{
height = pageStriping & 0x7fff;
}
else
{
height = pageBitmapHeight;
}
pageBitmap = new JBIG2Bitmap(pageBitmapWidth, height, arithmeticDecoder, huffmanDecoder, mmrDecoder);
pageBitmap.Clear(defPix);
}
private int GetNoOfPages()
{
short[] noOfPages = new short[4];
reader.Readbyte(noOfPages);
return(BinaryOperation.GetInt32(noOfPages));
}
public int GetBlackCode()
{
int tuple0, tuple1;
long code;
if (bufferLength == 0)
{
buffer = (reader.Readbyte() & 0xff);
bufferLength = 8;
noOfbytesRead++;
}
while (true)
{
if (bufferLength >= 6 && ((BinaryOperation.Bit32ShiftR(buffer, (int)(bufferLength - 6))) & 0x3f) == 0)
{
if (bufferLength <= 13)
{
code = BinaryOperation.Bit32ShiftL(buffer, (int)(13 - bufferLength));
}
else
{
code = BinaryOperation.Bit32ShiftR(buffer, (int)(bufferLength - 13));
}
tuple0 = blackTable1[(int)(code & 0x7f), 0];
tuple1 = blackTable1[(int)(code & 0x7f), 1];
}
else if (bufferLength >= 4 && ((buffer >> ((int)bufferLength - 4)) & 0x0f) == 0)
{
if (bufferLength <= 12)
{
code = BinaryOperation.Bit32ShiftL(buffer, (int)(12 - bufferLength));
}
else
{
code = BinaryOperation.Bit32ShiftR(buffer, (int)(bufferLength - 12));
}
int lookup = (int)((code & 0xff) - 64);
if (lookup >= 0)
{
tuple0 = blackTable2[lookup, 0];
tuple1 = blackTable2[lookup, 1];
}
else
{
tuple0 = blackTable1[blackTable1.Length + lookup, 0];
tuple1 = blackTable1[blackTable1.Length + lookup, 1];
}
}
else
{
if (bufferLength <= 6)
{
code = BinaryOperation.Bit32ShiftL(buffer, (int)(6 - bufferLength));
}
else
{
code = BinaryOperation.Bit32ShiftR(buffer, (int)(bufferLength - 6));
}
int lookup = (int)(code & 0x3f);
if (lookup >= 0)
{
tuple0 = blackTable3[lookup, 0];
tuple1 = blackTable3[lookup, 1];
}
else
{
tuple0 = blackTable2[blackTable2.Length + lookup, 0];
tuple1 = blackTable2[blackTable2.Length + lookup, 1];
}
}
if (tuple0 > 0 && tuple0 <= (int)bufferLength)
{
bufferLength -= tuple0;
return(tuple1);
}
if (bufferLength >= 13)
{
break;
}
buffer = ((BinaryOperation.Bit32ShiftL(buffer, 8)) | (reader.Readbyte() & 0xff));
bufferLength += 8;
noOfbytesRead++;
}
bufferLength--;
return(1);
}
private void HandleSegmentReferredToCountAndRententionFlags(SegmentHeader segmentHeader)
{
short referedToSegmentCountAndRetentionFlags = reader.Readbyte();
int referredToSegmentCount = (referedToSegmentCountAndRetentionFlags & 224) >> 5; // 224
// =
// 11100000
short[] retentionFlags = null;
/** take off the first three bits of the first byte */
short firstbyte = (short)(referedToSegmentCountAndRetentionFlags & 31); // 31 =
// 00011111
if (referredToSegmentCount <= 4)
{ // short form
retentionFlags = new short[1];
retentionFlags[0] = firstbyte;
}
else if (referredToSegmentCount == 7)
{ // long form
short[] longFormCountAndFlags = new short[4];
/** add the first byte of the four */
longFormCountAndFlags[0] = firstbyte;
for (int i = 1; i < 4; i++)
{
// add the next 3 bytes to the array
longFormCountAndFlags[i] = reader.Readbyte();
}
/** get the count of the referred to Segments */
referredToSegmentCount = BinaryOperation.GetInt32(longFormCountAndFlags);
/** calculate the number of bytes in this field */
int noOfbytesInField = (int)Math.Ceiling(4 + ((referredToSegmentCount + 1) / 8d));
// System.out.println("noOfbytesInField = " + noOfbytesInField);
int noOfRententionFlagbytes = noOfbytesInField - 4;
retentionFlags = new short[noOfRententionFlagbytes];
reader.Readbyte(retentionFlags);
}
else
{ // error
//throw new JBIG2Exception("Error, 3 bit Segment count field = " + referredToSegmentCount);
}
segmentHeader.SetReferredToSegmentCount(referredToSegmentCount);
if (JBIG2StreamDecoder.debug)
{
Console.WriteLine("referredToSegmentCount = " + referredToSegmentCount);
}
segmentHeader.SetRententionFlags(retentionFlags);
if (JBIG2StreamDecoder.debug)
{
Console.WriteLine("retentionFlags = ");
}
if (JBIG2StreamDecoder.debug)
{
for (int i = 0; i < retentionFlags.Length; i++)
{
Console.WriteLine(retentionFlags[i] + " ");
}
Console.WriteLine("");
}
}
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();
}
public override void ReadSegment()
{
/** read text region Segment flags */
ReadPatternDictionaryFlags();
width = decoder.Readbyte();
height = decoder.Readbyte();
if (JBIG2StreamDecoder.debug)
{
Console.WriteLine("pattern dictionary size = " + width + " , " + height);
}
short[] buf = new short[4];
decoder.Readbyte(buf);
grayMax = BinaryOperation.GetInt32(buf);
if (JBIG2StreamDecoder.debug)
{
Console.WriteLine("grey max = " + grayMax);
}
bool useMMR = patternDictionaryFlags.GetFlagValue(PatternDictionaryFlags.HD_MMR) == 1;
int template = patternDictionaryFlags.GetFlagValue(PatternDictionaryFlags.HD_TEMPLATE);
if (!useMMR)
{
arithmeticDecoder.ResetGenericStats(template, null);
arithmeticDecoder.Start();
}
short[] genericBAdaptiveTemplateX = new short[4], genericBAdaptiveTemplateY = new short[4];
genericBAdaptiveTemplateX[0] = (short)-width;
genericBAdaptiveTemplateY[0] = 0;
genericBAdaptiveTemplateX[1] = -3;
genericBAdaptiveTemplateY[1] = -1;
genericBAdaptiveTemplateX[2] = 2;
genericBAdaptiveTemplateY[2] = -2;
genericBAdaptiveTemplateX[3] = -2;
genericBAdaptiveTemplateY[3] = -2;
size = grayMax + 1;
JBIG2Bitmap bitmap = new JBIG2Bitmap(size * width, height, arithmeticDecoder, huffmanDecoder, mmrDecoder);
bitmap.Clear(0);
bitmap.ReadBitmap(useMMR, template, false, false, null, genericBAdaptiveTemplateX, genericBAdaptiveTemplateY, segmentHeader.GetSegmentDataLength() - 7);
JBIG2Bitmap[] bitmaps = new JBIG2Bitmap[size];
int x = 0;
for (int i = 0; i < size; i++)
{
bitmaps[i] = bitmap.GetSlice(x, 0, width, height);
x += width;
}
this.bitmaps = bitmaps;
}
public DecodeIntResult DecodeInt(ArithmeticDecoderStats stats)
{
long value;
previous = 1;
int s = DecodeIntBit(stats);
if (DecodeIntBit(stats) != 0)
{
if (DecodeIntBit(stats) != 0)
{
if (DecodeIntBit(stats) != 0)
{
if (DecodeIntBit(stats) != 0)
{
if (DecodeIntBit(stats) != 0)
{
value = 0;
for (int i = 0; i < 32; i++)
{
value = BinaryOperation.Bit32ShiftL(value, 1) | DecodeIntBit(stats);
}
value += 4436;
}
else
{
value = 0;
for (int i = 0; i < 12; i++)
{
value = BinaryOperation.Bit32ShiftL(value, 1) | DecodeIntBit(stats);
}
value += 340;
}
}
else
{
value = 0;
for (int i = 0; i < 8; i++)
{
value = BinaryOperation.Bit32ShiftL(value, 1) | DecodeIntBit(stats);
}
value += 84;
}
}
else
{
value = 0;
for (int i = 0; i < 6; i++)
{
value = BinaryOperation.Bit32ShiftL(value, 1) | DecodeIntBit(stats);
}
value += 20;
}
}
else
{
value = DecodeIntBit(stats);
value = BinaryOperation.Bit32ShiftL(value, 1) | DecodeIntBit(stats);
value = BinaryOperation.Bit32ShiftL(value, 1) | DecodeIntBit(stats);
value = BinaryOperation.Bit32ShiftL(value, 1) | DecodeIntBit(stats);
value += 4;
}
}
else
{
value = DecodeIntBit(stats);
value = BinaryOperation.Bit32ShiftL(value, 1) | DecodeIntBit(stats);
}
int decodedInt;
if (s != 0)
{
if (value == 0)
{
return(new DecodeIntResult((int)value, false));
}
decodedInt = (int)-value;
}
else
{
decodedInt = (int)value;
}
return(new DecodeIntResult(decodedInt, true));
}
private void ReadSymbolDictionaryFlags()
{
/** extract symbol dictionary flags */
short[] symbolDictionaryFlagsField = new short[2];
decoder.Readbyte(symbolDictionaryFlagsField);
int flags = BinaryOperation.GetInt16(symbolDictionaryFlagsField);
symbolDictionaryFlags.SetFlags(flags);
if (JBIG2StreamDecoder.debug)
{
Console.WriteLine("symbolDictionaryFlags = " + flags);
}
// symbol dictionary AT flags
int sdHuff = symbolDictionaryFlags.GetFlagValue(SymbolDictionaryFlags.SD_HUFF);
int sdTemplate = symbolDictionaryFlags.GetFlagValue(SymbolDictionaryFlags.SD_TEMPLATE);
if (sdHuff == 0)
{
if (sdTemplate == 0)
{
symbolDictionaryAdaptiveTemplateX[0] = ReadATValue();
symbolDictionaryAdaptiveTemplateY[0] = ReadATValue();
symbolDictionaryAdaptiveTemplateX[1] = ReadATValue();
symbolDictionaryAdaptiveTemplateY[1] = ReadATValue();
symbolDictionaryAdaptiveTemplateX[2] = ReadATValue();
symbolDictionaryAdaptiveTemplateY[2] = ReadATValue();
symbolDictionaryAdaptiveTemplateX[3] = ReadATValue();
symbolDictionaryAdaptiveTemplateY[3] = ReadATValue();
}
else
{
symbolDictionaryAdaptiveTemplateX[0] = ReadATValue();
symbolDictionaryAdaptiveTemplateY[0] = ReadATValue();
}
}
// symbol dictionary refinement AT flags
int refAgg = symbolDictionaryFlags.GetFlagValue(SymbolDictionaryFlags.SD_REF_AGG);
int sdrTemplate = symbolDictionaryFlags.GetFlagValue(SymbolDictionaryFlags.SD_R_TEMPLATE);
if (refAgg != 0 && sdrTemplate == 0)
{
symbolDictionaryRAdaptiveTemplateX[0] = ReadATValue();
symbolDictionaryRAdaptiveTemplateY[0] = ReadATValue();
symbolDictionaryRAdaptiveTemplateX[1] = ReadATValue();
symbolDictionaryRAdaptiveTemplateY[1] = ReadATValue();
}
/** extract no of exported symbols */
short[] noOfExportedSymbolsField = new short[4];
decoder.Readbyte(noOfExportedSymbolsField);
int noOfExportedSymbols = BinaryOperation.GetInt32(noOfExportedSymbolsField);
this.noOfExportedSymbols = noOfExportedSymbols;
if (JBIG2StreamDecoder.debug)
{
Console.WriteLine("noOfExportedSymbols = " + noOfExportedSymbols);
}
/** extract no of new symbols */
short[] noOfNewSymbolsField = new short[4];
decoder.Readbyte(noOfNewSymbolsField);
int noOfNewSymbols = BinaryOperation.GetInt32(noOfNewSymbolsField);
this.noOfNewSymbols = noOfNewSymbols;
if (JBIG2StreamDecoder.debug)
{
Console.WriteLine("noOfNewSymbols = " + noOfNewSymbols);
}
}
public override void ReadSegment()
{
base.ReadSegment();
/** read text region Segment flags */
ReadHalftoneRegionFlags();
short[] buf = new short[4];
decoder.Readbyte(buf);
int gridWidth = BinaryOperation.GetInt32(buf);
buf = new short[4];
decoder.Readbyte(buf);
int gridHeight = BinaryOperation.GetInt32(buf);
buf = new short[4];
decoder.Readbyte(buf);
int gridX = BinaryOperation.GetInt32(buf);
buf = new short[4];
decoder.Readbyte(buf);
int gridY = BinaryOperation.GetInt32(buf);
if (JBIG2StreamDecoder.debug)
{
Console.WriteLine("grid pos and size = " + gridX + ',' + gridY + ' ' + gridWidth + ',' + gridHeight);
}
buf = new short[2];
decoder.Readbyte(buf);
int stepX = BinaryOperation.GetInt16(buf);
buf = new short[2];
decoder.Readbyte(buf);
int stepY = BinaryOperation.GetInt16(buf);
if (JBIG2StreamDecoder.debug)
{
Console.WriteLine("step size = " + stepX + ',' + stepY);
}
int[] referedToSegments = segmentHeader.GetReferredToSegments();
if (referedToSegments.Length != 1)
{
Console.WriteLine("Error in halftone Segment. refSegs should == 1");
}
Segment segment = decoder.FindSegment(referedToSegments[0]);
if (segment.GetSegmentHeader().GetSegmentType() != Segment.PATTERN_DICTIONARY)
{
if (JBIG2StreamDecoder.debug)
{
Console.WriteLine("Error in halftone Segment. bad symbol dictionary reference");
}
}
PatternDictionarySegment patternDictionarySegment = (PatternDictionarySegment)segment;
int bitsPerValue = 0, i = 1;
while (i < patternDictionarySegment.GetSize())
{
bitsPerValue++;
i <<= 1;
}
JBIG2Bitmap bitmap = patternDictionarySegment.GetBitmaps()[0];
long patternWidth = bitmap.GetWidth();
long patternHeight = bitmap.GetHeight();
if (JBIG2StreamDecoder.debug)
{
Console.WriteLine("pattern size = " + patternWidth + ',' + patternHeight);
}
bool useMMR = halftoneRegionFlags.GetFlagValue(HalftoneRegionFlags.H_MMR) != 0;
int template = halftoneRegionFlags.GetFlagValue(HalftoneRegionFlags.H_TEMPLATE);
if (!useMMR)
{
arithmeticDecoder.ResetGenericStats(template, null);
arithmeticDecoder.Start();
}
int halftoneDefaultPixel = halftoneRegionFlags.GetFlagValue(HalftoneRegionFlags.H_DEF_PIXEL);
bitmap = new JBIG2Bitmap(regionBitmapWidth, regionBitmapHeight, arithmeticDecoder, huffmanDecoder, mmrDecoder);
bitmap.Clear(halftoneDefaultPixel);
bool enableSkip = halftoneRegionFlags.GetFlagValue(HalftoneRegionFlags.H_ENABLE_SKIP) != 0;
JBIG2Bitmap skipBitmap = null;
if (enableSkip)
{
skipBitmap = new JBIG2Bitmap(gridWidth, gridHeight, arithmeticDecoder, huffmanDecoder, mmrDecoder);
skipBitmap.Clear(0);
for (int y = 0; y < gridHeight; y++)
{
for (int x = 0; x < gridWidth; x++)
{
int xx = gridX + y * stepY + x * stepX;
int yy = gridY + y * stepX - x * stepY;
if (((xx + patternWidth) >> 8) <= 0 || (xx >> 8) >= regionBitmapWidth || ((yy + patternHeight) >> 8) <= 0 || (yy >> 8) >= regionBitmapHeight)
{
skipBitmap.SetPixel(y, x, 1);
}
}
}
}
int[] grayScaleImage = new int[gridWidth * gridHeight];
short[] genericBAdaptiveTemplateX = new short[4], genericBAdaptiveTemplateY = new short[4];
genericBAdaptiveTemplateX[0] = (short)(template <= 1 ? 3 : 2);
genericBAdaptiveTemplateY[0] = -1;
genericBAdaptiveTemplateX[1] = -3;
genericBAdaptiveTemplateY[1] = -1;
genericBAdaptiveTemplateX[2] = 2;
genericBAdaptiveTemplateY[2] = -2;
genericBAdaptiveTemplateX[3] = -2;
genericBAdaptiveTemplateY[3] = -2;
JBIG2Bitmap grayBitmap;
for (int j = bitsPerValue - 1; j >= 0; --j)
{
grayBitmap = new JBIG2Bitmap(gridWidth, gridHeight, arithmeticDecoder, huffmanDecoder, mmrDecoder);
grayBitmap.ReadBitmap(useMMR, template, false, enableSkip, skipBitmap, genericBAdaptiveTemplateX, genericBAdaptiveTemplateY, -1);
i = 0;
for (int row = 0; row < gridHeight; row++)
{
for (int col = 0; col < gridWidth; col++)
{
int bit = grayBitmap.GetPixel(col, row) ^ grayScaleImage[i] & 1;
grayScaleImage[i] = (grayScaleImage[i] << 1) | bit;
i++;
}
}
}
int combinationOperator = halftoneRegionFlags.GetFlagValue(HalftoneRegionFlags.H_COMB_OP);
i = 0;
for (int col = 0; col < gridHeight; col++)
{
int xx = gridX + col * stepY;
int yy = gridY + col * stepX;
for (int row = 0; row < gridWidth; row++)
{
if (!(enableSkip && skipBitmap.GetPixel(col, row) == 1))
{
JBIG2Bitmap patternBitmap = patternDictionarySegment.GetBitmaps()[grayScaleImage[i]];
bitmap.Combine(patternBitmap, xx >> 8, yy >> 8, combinationOperator);
}
xx += stepX;
yy -= stepY;
i++;
}
}
if (inlineImage)
{
PageInformationSegment pageSegment = decoder.FindPageSegement(segmentHeader.GetPageAssociation());
JBIG2Bitmap pageBitmap = pageSegment.GetPageBitmap();
int externalCombinationOperator = regionFlags.GetFlagValue(RegionFlags.EXTERNAL_COMBINATION_OPERATOR);
pageBitmap.Combine(bitmap, regionBitmapXLocation, regionBitmapYLocation, externalCombinationOperator);
}
else
{
bitmap.SetBitmapNumber(GetSegmentHeader().GetSegmentNumber());
decoder.AppendBitmap(bitmap);
}
}
public int DecodeBit(long context, ArithmeticDecoderStats stats)
{
int iCX = BinaryOperation.Bit8Shift(stats.GetContextCodingTableValue((int)context), 1, BinaryOperation.RIGHT_SHIFT);
int mpsCX = stats.GetContextCodingTableValue((int)context) & 1;
int qe = qeTable[iCX];
a -= qe;
int bit;
if (c < a)
{
if ((a & 0x80000000) != 0)
{
bit = mpsCX;
}
else
{
if (a < qe)
{
bit = 1 - mpsCX;
if (switchTable[iCX] != 0)
{
stats.SetContextCodingTableValue((int)context, (nlpsTable[iCX] << 1) | (1 - mpsCX));
}
else
{
stats.SetContextCodingTableValue((int)context, (nlpsTable[iCX] << 1) | mpsCX);
}
}
else
{
bit = mpsCX;
stats.SetContextCodingTableValue((int)context, (nmpsTable[iCX] << 1) | mpsCX);
}
do
{
if (counter == 0)
{
Readbyte();
}
a = BinaryOperation.Bit32ShiftL(a, 1);
c = BinaryOperation.Bit32ShiftL(c, 1);
counter--;
} while ((a & 0x80000000) == 0);
}
}
else
{
c -= a;
if (a < qe)
{
bit = mpsCX;
stats.SetContextCodingTableValue((int)context, (nmpsTable[iCX] << 1) | mpsCX);
}
else
{
bit = 1 - mpsCX;
if (switchTable[iCX] != 0)
{
stats.SetContextCodingTableValue((int)context, (nlpsTable[iCX] << 1) | (1 - mpsCX));
}
else
{
stats.SetContextCodingTableValue((int)context, (nlpsTable[iCX] << 1) | mpsCX);
}
}
a = qe;
do
{
if (counter == 0)
{
Readbyte();
}
a = BinaryOperation.Bit32ShiftL(a, 1);
c = BinaryOperation.Bit32ShiftL(c, 1);
counter--;
} while ((a & 0x80000000) == 0);
}
return(bit);
}
public int GetWhiteCode()
{
int tuple0, tuple1;
long code;
if (bufferLength == 0)
{
buffer = (reader.Readbyte() & 0xff);
bufferLength = 8;
noOfbytesRead++;
}
while (true)
{
if (bufferLength >= 7 && ((BinaryOperation.Bit32ShiftR(buffer, (int)(bufferLength - 7))) & 0x7f) == 0)
{
if (bufferLength <= 12)
{
code = BinaryOperation.Bit32ShiftL(buffer, (int)(12 - bufferLength));
}
else
{
code = BinaryOperation.Bit32ShiftR(buffer, (int)(bufferLength - 12));
}
tuple0 = whiteTable1[(int)(code & 0x1f), 0];
tuple1 = whiteTable1[(int)(code & 0x1f), 1];
}
else
{
if (bufferLength <= 9)
{
code = BinaryOperation.Bit32ShiftL(buffer, (int)(9 - bufferLength));
}
else
{
code = BinaryOperation.Bit32ShiftR(buffer, (int)(bufferLength - 9));
}
int lookup = (int)(code & 0x1ff);
if (lookup >= 0)
{
tuple0 = whiteTable2[lookup, 0];
tuple1 = whiteTable2[lookup, 1];
}
else
{
tuple0 = whiteTable2[whiteTable2.Length + lookup, 0];
tuple1 = whiteTable2[whiteTable2.Length + lookup, 1];
}
}
if (tuple0 > 0 && tuple0 <= (int)bufferLength)
{
bufferLength -= tuple0;
return(tuple1);
}
if (bufferLength >= 12)
{
break;
}
buffer = ((BinaryOperation.Bit32ShiftL(buffer, 8)) | reader.Readbyte() & 0xff);
bufferLength += 8;
noOfbytesRead++;
}
bufferLength--;
return(1);
}