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GARbro-mirror/ArcFormats/ImageERI.cs

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//! \file ImageERI.cs
//! \date Tue May 26 12:04:30 2015
//! \brief Entis rasterized image format.
//
// Copyright (C) 2015 by morkt
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to
// deal in the Software without restriction, including without limitation the
// rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
// sell copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
// IN THE SOFTWARE.
//
using System;
using System.ComponentModel.Composition;
using System.Diagnostics;
using System.IO;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using GameRes.Utility;
namespace GameRes.Formats.Entis
{
internal class EriMetaData : ImageMetaData
{
public int StreamPos;
public int Version;
public CvType Transformation;
public EriCode Architecture;
public int FormatType;
public bool VerticalFlip;
public int ClippedPixel;
public int SamplingFlags;
public ulong QuantumizedBits;
public ulong AllottedBits;
public int BlockingDegree;
public int LappedBlock;
public int FrameTransform;
public int FrameDegree;
}
public enum CvType
{
Lossless_ERI = 0x03020000,
DCT_ERI = 0x00000001,
LOT_ERI = 0x00000005,
LOT_ERI_MSS = 0x00000105,
}
public enum EriCode
{
RunlengthGamma = -1,
RunlengthHuffman = -4,
Nemesis = -16,
}
public enum EriImage
{
RGB = 0x00000001,
RGBA = 0x04000001,
Gray = 0x00000002,
TypeMask = 0x00FFFFFF,
WithPalette = 0x01000000,
UseClipping = 0x02000000,
WithAlpha = 0x04000000,
SideBySide = 0x10000000,
}
internal class EriFile : BinaryReader
{
internal struct Section
{
public AsciiString Id;
public long Length;
}
public EriFile (Stream stream) : base (stream, System.Text.Encoding.ASCII, true)
{
}
public Section ReadSection ()
{
var section = new Section();
section.Id = new AsciiString (8);
if (8 != this.Read (section.Id.Value, 0, 8))
throw new EndOfStreamException();
section.Length = this.ReadInt64();
return section;
}
public long FindSection (string name)
{
var id = new AsciiString (8);
for (;;)
{
if (8 != this.Read (id.Value, 0, 8))
throw new EndOfStreamException();
var length = this.ReadInt64();
if (length < 0)
throw new EndOfStreamException();
if (id == name)
return length;
this.BaseStream.Seek (length, SeekOrigin.Current);
}
}
}
[Export(typeof(ImageFormat))]
public class EriFormat : ImageFormat
{
public override string Tag { get { return "ERI"; } }
public override string Description { get { return "Entis rasterized image format"; } }
public override uint Signature { get { return 0x69746e45u; } } // 'Enti'
public override ImageMetaData ReadMetaData (Stream stream)
{
byte[] header = new byte[0x40];
if (header.Length != stream.Read (header, 0, header.Length))
return null;
if (0x03000100 != LittleEndian.ToUInt32 (header, 8))
return null;
if (!Binary.AsciiEqual (header, 0x10, "Entis Rasterized Image"))
return null;
using (var reader = new EriFile (stream))
{
var section = reader.ReadSection();
if (section.Id != "Header " || section.Length <= 0)
return null;
int header_size = (int)section.Length;
int stream_pos = 0x50 + header_size;
EriMetaData info = null;
while (header_size > 8)
{
section = reader.ReadSection();
header_size -= 8;
if (section.Length <= 0 || section.Length > header_size)
break;
if ("ImageInf" == section.Id)
{
int version = reader.ReadInt32();
if (version != 0x00020100 && version != 0x00020200)
return null;
info = new EriMetaData { StreamPos = stream_pos, Version = version };
info.Transformation = (CvType)reader.ReadInt32();
info.Architecture = (EriCode)reader.ReadInt32();
info.FormatType = reader.ReadInt32();
int w = reader.ReadInt32();
int h = reader.ReadInt32();
info.Width = (uint)Math.Abs (w);
info.Height = (uint)Math.Abs (h);
info.VerticalFlip = h < 0;
info.BPP = reader.ReadInt32();
info.ClippedPixel = reader.ReadInt32();
info.SamplingFlags = reader.ReadInt32();
info.QuantumizedBits = reader.ReadUInt64();
info.AllottedBits = reader.ReadUInt64();
info.BlockingDegree = reader.ReadInt32();
info.LappedBlock = reader.ReadInt32();
info.FrameTransform = reader.ReadInt32();
info.FrameDegree = reader.ReadInt32();
break;
}
header_size -= (int)section.Length;
reader.BaseStream.Seek (section.Length, SeekOrigin.Current);
}
return info;
}
}
public override ImageData Read (Stream stream, ImageMetaData info)
{
var meta = info as EriMetaData;
if (null == meta)
throw new ArgumentException ("EriFormat.Read should be supplied with EriMetaData", "info");
stream.Position = meta.StreamPos;
using (var input = new EriFile (stream))
{
Color[] palette = null;
for (;;) // ReadSection throws an exception in case of EOF
{
var section = input.ReadSection();
if ("Stream " == section.Id)
continue;
if ("ImageFrm" == section.Id)
break;
if ("Palette " == section.Id && info.BPP <= 8 && section.Length <= 0x400)
{
palette = ReadPalette (stream, (int)section.Length);
continue;
}
input.BaseStream.Seek (section.Length, SeekOrigin.Current);
}
var reader = new EriReader (stream, meta, palette);
reader.DecodeImage();
var bitmap = BitmapSource.Create ((int)info.Width, (int)info.Height,
ImageData.DefaultDpiX, ImageData.DefaultDpiY,
reader.Format, reader.Palette, reader.Data, reader.Stride);
bitmap.Freeze();
return new ImageData (bitmap, info);
}
}
private Color[] ReadPalette (Stream input, int palette_length)
{
var palette_data = new byte[0x400];
if (palette_length > palette_data.Length)
throw new InvalidFormatException();
if (palette_length != input.Read (palette_data, 0, palette_length))
throw new InvalidFormatException();
var colors = new Color[256];
for (int i = 0; i < 256; ++i)
{
colors[i] = Color.FromRgb (palette_data[i*4+2], palette_data[i*4+1], palette_data[i*4]);
}
return colors;
}
public override void Write (Stream file, ImageData image)
{
throw new NotImplementedException ("EriFormat.Write not implemented");
}
}
/*****************************************************************************
E R I S A - L i b r a r y
-----------------------------------------------------------------------------
Copyright (C) 2002-2004 Leshade Entis, Entis-soft. All rights reserved.
*****************************************************************************/
internal class EriReader
{
EriMetaData m_info;
byte[] m_output;
ERISADecodeContext m_context;
int m_dst;
uint m_nBlockSize;
uint m_nBlockArea;
uint m_nBlockSamples;
uint m_nChannelCount;
uint m_nWidthBlocks;
uint m_nHeightBlocks;
int m_dwBytesPerLine;
uint m_dwClippedPixel;
int m_ptrDstBlock;
int m_nDstLineBytes;
int m_nDstPixelBytes;
uint m_nDstWidth;
uint m_nDstHeight;
uint m_fdwDecFlags;
// buffers for lossless encoding
byte[] m_ptrOperations;
sbyte[] m_ptrColumnBuf;
sbyte[] m_ptrLineBuf;
sbyte[] m_ptrDecodeBuf;
sbyte[] m_ptrArrangeBuf;
int[] m_pArrangeTable = new int[4];
HuffmanTree m_pHuffmanTree;
PtrProcedure[] m_pfnColorOperation;
public byte[] Data { get { return m_output; } }
public PixelFormat Format { get; private set; }
public int Stride { get { return Math.Abs (m_dwBytesPerLine); } }
public BitmapPalette Palette { get; private set; }
public EriReader (Stream stream, EriMetaData info, Color[] palette)
{
m_info = info;
if (CvType.Lossless_ERI == m_info.Transformation)
InitializeLossless();
else if (CvType.LOT_ERI == m_info.Transformation
|| CvType.DCT_ERI == m_info.Transformation)
InitializeLossy();
else
throw new NotSupportedException ("Not supported ERI compression");
if (null != palette)
Palette = new BitmapPalette (palette);
CreateImageBuffer();
m_context.AttachInputFile (stream);
m_pfnColorOperation = new PtrProcedure[0x10]
{
ColorOperation0000,
ColorOperation0000,
ColorOperation0000,
ColorOperation0000,
ColorOperation0000,
ColorOperation0101,
ColorOperation0110,
ColorOperation0111,
ColorOperation0000,
ColorOperation1001,
ColorOperation1010,
ColorOperation1011,
ColorOperation0000,
ColorOperation1101,
ColorOperation1110,
ColorOperation1111
};
}
private void InitializeLossless ()
{
switch (m_info.Architecture)
{
case EriCode.Nemesis:
throw new NotSupportedException ("Not supported ERI compression");
case EriCode.RunlengthHuffman:
case EriCode.RunlengthGamma:
break;
default:
throw new InvalidFormatException();
}
if (0 == m_info.BlockingDegree)
throw new InvalidFormatException();
switch (m_info.FormatType & (int)EriImage.TypeMask)
{
case (int)EriImage.RGB:
if (m_info.BPP <= 8)
m_nChannelCount = 1;
else if (0 == (m_info.FormatType & (int)EriImage.WithAlpha))
m_nChannelCount = 3;
else
m_nChannelCount = 4;
break;
case (int)EriImage.Gray:
m_nChannelCount = 1;
break;
default:
throw new InvalidFormatException();
}
m_nBlockSize = (uint) (1 << m_info.BlockingDegree);
m_nBlockArea = (uint) (1 << (m_info.BlockingDegree * 2));
m_nBlockSamples = m_nBlockArea * m_nChannelCount;
m_nWidthBlocks = (uint)((m_info.Width + m_nBlockSize - 1) >> m_info.BlockingDegree);
m_nHeightBlocks = (uint)((m_info.Height + m_nBlockSize - 1) >> m_info.BlockingDegree);
m_ptrOperations = new byte[m_nWidthBlocks * m_nHeightBlocks];
m_ptrColumnBuf = new sbyte[m_nBlockSize * m_nChannelCount];
m_ptrLineBuf = new sbyte[m_nChannelCount * (m_nWidthBlocks << m_info.BlockingDegree)];
m_ptrDecodeBuf = new sbyte[m_nBlockSamples];
m_ptrArrangeBuf = new sbyte[m_nBlockSamples];
InitializeArrangeTable();
if (0x00020200 == m_info.Version)
{
if (EriCode.RunlengthHuffman == m_info.Architecture)
{
m_pHuffmanTree = new HuffmanTree();
}
/*
else if (EriCode.Nemesis == m_info.Architecture)
{
m_pProbERISA = new ERISA_PROB_MODEL ;
}
*/
}
if (EriCode.RunlengthHuffman == m_info.Architecture)
m_context = new HuffmanDecodeContext (0x10000);
else
m_context = new RLEDecodeContext (0x10000);
}
private void InitializeLossy ()
{
throw new NotImplementedException ("Lossy ERI compression not implemented");
}
int[] m_ptrTable;
void InitializeArrangeTable ()
{
uint i, j, k, l, m;
m_ptrTable = new int[m_nBlockSamples * 4];
m_pArrangeTable[0] = 0;
m_pArrangeTable[1] = (int)m_nBlockSamples;
m_pArrangeTable[2] = (int)m_nBlockSamples * 2;
m_pArrangeTable[3] = (int)m_nBlockSamples * 3;
int ptrNext = m_pArrangeTable[0];
for (i = 0; i < m_nBlockSamples; ++i)
{
m_ptrTable[ptrNext+i] = (int)i;
}
ptrNext = m_pArrangeTable[1];
l = 0;
for (i = 0; i < m_nChannelCount; i++)
{
for (j = 0; j < m_nBlockSize; j++)
{
m = l + j;
for (k = 0; k < m_nBlockSize; k++)
{
m_ptrTable[ptrNext++] = (int)m;
m += m_nBlockSize;
}
}
l += m_nBlockArea;
}
ptrNext = m_pArrangeTable[2];
for (i = 0; i < m_nBlockArea; i++)
{
k = i;
for (j = 0; j < m_nChannelCount; j++)
{
m_ptrTable[ptrNext++] = (int)k;
k += m_nBlockArea;
}
}
ptrNext = m_pArrangeTable[3];
for (i = 0; i < m_nBlockSize; i++)
{
l = i;
for (j = 0; j < m_nBlockSize; j++)
{
m = l;
l += m_nBlockSize;
for (k = 0; k < m_nChannelCount; k++)
{
m_ptrTable[ptrNext++] = (int)m;
m += m_nBlockArea;
}
}
}
}
private void CreateImageBuffer ()
{
uint stride = ((m_info.Width * (uint)m_info.BPP / 8u) + 0x03u) & ~0x03u;
uint image_bytes = stride * m_info.Height;
m_output = new byte[image_bytes];
m_dwBytesPerLine = (int)stride;
m_dwClippedPixel = 0;
if (!m_info.VerticalFlip)
{
m_dst = ((int)m_info.Height - 1) * m_dwBytesPerLine;
m_dwBytesPerLine = -m_dwBytesPerLine;
}
else
{
m_dst = 0;
}
}
public void DecodeImage ()
{
if (CvType.Lossless_ERI == m_info.Transformation)
DecodeLosslessImage (m_context as RLEDecodeContext);
else
DecodeLossyImage (m_context as HuffmanDecodeContext);
}
private delegate void PtrProcedure ();
private void DecodeLosslessImage (RLEDecodeContext context)
{
context.FlushBuffer();
uint nERIVersion = context.GetNBits (8);
uint fOpTable = context.GetNBits (8);
uint fEncodeType = context.GetNBits (8);
uint nBitCount = context.GetNBits (8);
if (0 != fOpTable || 0 != (fEncodeType & 0xFE))
{
throw new InvalidFormatException();
}
switch (nERIVersion)
{
case 1:
if (nBitCount != 0)
throw new InvalidFormatException();
break;
case 8:
if (nBitCount != 8)
throw new InvalidFormatException();
break;
case 16:
if ((nBitCount != 8) || (fEncodeType != 0))
throw new InvalidFormatException();
break;
default:
throw new InvalidFormatException();
}
m_nDstPixelBytes = m_info.BPP >> 3;
m_nDstLineBytes = m_dwBytesPerLine;
var pfnRestoreFunc = GetLLRestoreFunc (m_info.FormatType, m_info.BPP);
if (null == pfnRestoreFunc)
throw new InvalidFormatException();
/*
if (EriCode.Nemesis == m_info.Architecture)
{
Debug.Assert (m_pProbERISA != null);
m_pProbERISA.Initialize();
}
*/
int i;
int ptrNextOperation = 0; // index within m_ptrOperations
if ((0 != (fEncodeType & 0x01)) && (m_nChannelCount >= 3))
{
Debug.Assert (m_info.Architecture != EriCode.Nemesis);
int nAllBlockCount = (int)(m_nWidthBlocks * m_nHeightBlocks);
for (i = 0; i < nAllBlockCount; i++)
{
if (EriCode.RunlengthGamma == m_info.Architecture)
{
m_ptrOperations[i] = (byte)(context.GetNBits(4) | 0xC0);
}
else
{
Debug.Assert (EriCode.RunlengthHuffman == m_info.Architecture);
m_ptrOperations[i] = (byte)(context as HuffmanDecodeContext).GetHuffmanCode (m_pHuffmanTree);
}
}
}
if (context.GetABit() != 0)
throw new InvalidFormatException();
if (EriCode.RunlengthGamma == m_info.Architecture)
{
if (0 != (fEncodeType & 0x01))
{
context.InitGammaContext();
}
}
else if (EriCode.RunlengthHuffman == m_info.Architecture)
{
(context as HuffmanDecodeContext).PrepareToDecodeERINACode();
}
/*
else
{
Debug.Assert (EriCode.Nemesis == m_info.Architecture);
context.PrepareToDecodeERISACode();
}
*/
int nWidthSamples = (int)(m_nChannelCount * m_nWidthBlocks * m_nBlockSize);
for (i = 0; i < nWidthSamples; ++i)
m_ptrLineBuf[i] = 0;
int nAllBlockLines = (int)(m_nBlockSize * m_nChannelCount);
int nLeftHeight = (int)m_info.Height;
for (int nPosY = 0; nPosY < (int) m_nHeightBlocks; ++nPosY)
{
int nColumnBufSamples = (int)(m_nBlockSize * m_nChannelCount);
for (i = 0; i < nColumnBufSamples; ++i)
m_ptrColumnBuf[i] = 0;
m_ptrDstBlock = m_dst + nPosY * m_dwBytesPerLine * (int)m_nBlockSize;
m_nDstHeight = m_nBlockSize;
if ((int)m_nDstHeight > nLeftHeight)
{
m_nDstHeight = (uint)nLeftHeight;
}
int nLeftWidth = (int)m_info.Width;
int ptrNextLineBuf = 0; // m_ptrLineBuf;
for (int nPosX = 0; nPosX < (int)m_nWidthBlocks; ++nPosX)
{
m_nDstWidth = Math.Min (m_nBlockSize, (uint)nLeftWidth);
uint dwOperationCode;
if (m_nChannelCount >= 3)
{
if (0 != (fEncodeType & 1))
{
dwOperationCode = m_ptrOperations[ptrNextOperation++];
}
else if (m_info.Architecture == EriCode.RunlengthHuffman)
{
dwOperationCode = (uint)(context as HuffmanDecodeContext).GetHuffmanCode (m_pHuffmanTree);
}
/*
else if (m_info.Architecture == EriCode.Nemesis)
{
dwOperationCode = context.DecodeERISACode (m_pProbERISA);
}
*/
else
{
Debug.Assert (EriCode.RunlengthGamma == m_info.Architecture);
dwOperationCode = context.GetNBits (4) | 0xC0;
context.InitGammaContext();
}
}
else
{
if ((int)EriImage.Gray == m_info.FormatType)
{
dwOperationCode = 0xC0;
}
else
{
dwOperationCode = 0x00;
}
if (0 == (fEncodeType & 0x01) && m_info.Architecture == EriCode.RunlengthGamma)
{
context.InitGammaContext();
}
}
if (context.DecodeBytes (m_ptrArrangeBuf, m_nBlockSamples) < m_nBlockSamples)
{
throw new InvalidFormatException();
}
PerformOperation (dwOperationCode, nAllBlockLines, m_ptrLineBuf, ptrNextLineBuf);
ptrNextLineBuf += nColumnBufSamples;
pfnRestoreFunc();
m_ptrDstBlock += (int)(m_nDstPixelBytes * m_nBlockSize);
nLeftWidth -= (int) m_nBlockSize;
}
nLeftHeight -= (int)m_nBlockSize;
}
}
private void DecodeLossyImage (HuffmanDecodeContext context)
{
throw new NotImplementedException ("Lossy ERI compression not implemented");
}
void PerformOperation (uint dwOpCode, int nAllBlockLines, sbyte[] pNextLineBuf, int iNextLineIdx )
{
int i, j, k;
uint nArrangeCode, nColorOperation, nDiffOperation;
nColorOperation = dwOpCode & 0x0F;
nArrangeCode = (dwOpCode >> 4) & 0x03;
nDiffOperation = (dwOpCode >> 6) & 0x03;
if (0 == nArrangeCode)
{
Buffer.BlockCopy (m_ptrArrangeBuf, 0, m_ptrDecodeBuf, 0, (int)m_nBlockSamples);
if (0 == dwOpCode)
{
return;
}
}
else
{
int pArrange = m_pArrangeTable[nArrangeCode];
for (i = 0; i < (int)m_nBlockSamples; i++)
{
m_ptrDecodeBuf[m_ptrTable[pArrange + i]] = m_ptrArrangeBuf[i];
}
}
m_pfnColorOperation[nColorOperation]();
int ptrNextBuf = 0; // m_ptrDecodeBuf
int ptrNextColBuf = 0; // m_ptrColumnBuf
if (0 != (nDiffOperation & 0x01))
{
for (i = 0; i < nAllBlockLines; i++)
{
sbyte nLastVal = m_ptrColumnBuf[ptrNextColBuf];
for (j = 0; j < (int)m_nBlockSize; j++)
{
nLastVal += m_ptrDecodeBuf[ptrNextBuf];
m_ptrDecodeBuf[ptrNextBuf++] = nLastVal;
}
m_ptrColumnBuf[ptrNextColBuf++] = nLastVal;
}
}
else
{
for (i = 0; i < nAllBlockLines; i ++)
{
m_ptrColumnBuf[ptrNextColBuf++] = m_ptrDecodeBuf[ptrNextBuf + m_nBlockSize - 1];
ptrNextBuf += (int)m_nBlockSize;
}
}
int iNextDst = 0;
for (k = 0; k < (int)m_nChannelCount; k++)
{
sbyte[] ptrLastLine = pNextLineBuf;
int idxLastLine = iNextLineIdx;
for (i = 0; i < (int)m_nBlockSize; i++)
{
for (j = 0; j < (int)m_nBlockSize; j++)
{
m_ptrDecodeBuf[iNextDst+j] += ptrLastLine[idxLastLine+j];
}
ptrLastLine = m_ptrDecodeBuf;
idxLastLine = iNextDst;
iNextDst += (int)m_nBlockSize;
}
Buffer.BlockCopy (ptrLastLine, idxLastLine, pNextLineBuf, iNextLineIdx, (int)m_nBlockSize);
iNextLineIdx += (int)m_nBlockSize;
}
}
PtrProcedure GetLLRestoreFunc (int fdwFormatType, int dwBitsPerPixel)
{
switch (dwBitsPerPixel)
{
case 32:
if ((int)EriImage.RGBA == fdwFormatType)
{
Format = PixelFormats.Bgra32;
return RestoreRGBA32;
}
Format = PixelFormats.Bgr32;
return RestoreRGB24;
case 24:
Format = PixelFormats.Bgr24;
return RestoreRGB24;
case 16:
Format = PixelFormats.Bgr555;
return RestoreRGB16;
case 8:
if (null == Palette)
Format = PixelFormats.Gray8;
else
Format = PixelFormats.Indexed8;
return RestoreGray8;
}
return null;
}
void RestoreRGBA32 ()
{
int ptrDstLine = m_ptrDstBlock;
int ptrSrcLine = 0; //m_ptrDecodeBuf;
int nBlockSamples = (int)m_nBlockArea;
int nBlockSamplesX3 = nBlockSamples * 3;
for (uint y = 0; y < m_nDstHeight; y++)
{
int ptrDstNext = ptrDstLine;
int ptrSrcNext = ptrSrcLine;
for (uint x = 0; x < m_nDstWidth; x++)
{
m_output[ptrDstNext++] = (byte)m_ptrDecodeBuf[ptrSrcNext];
m_output[ptrDstNext++] = (byte)m_ptrDecodeBuf[ptrSrcNext + nBlockSamples];
m_output[ptrDstNext++] = (byte)m_ptrDecodeBuf[ptrSrcNext + nBlockSamples * 2];
m_output[ptrDstNext++] = (byte)m_ptrDecodeBuf[ptrSrcNext + nBlockSamplesX3];
ptrSrcNext ++;
}
ptrSrcLine += (int)m_nBlockSize;
ptrDstLine += m_nDstLineBytes;
}
}
void RestoreRGB24()
{
int ptrDstLine = m_ptrDstBlock;
int ptrSrcLine = 0; //m_ptrDecodeBuf;
int nBytesPerPixel = m_nDstPixelBytes;
int nBlockSamples = (int)m_nBlockArea;
for (uint y = 0; y < m_nDstHeight; y++)
{
int ptrDstNext = ptrDstLine;
int ptrSrcNext = ptrSrcLine;
for (uint x = 0; x < m_nDstWidth; x++)
{
m_output[ptrDstNext] = (byte)m_ptrDecodeBuf[ptrSrcNext];
m_output[ptrDstNext+1] = (byte)m_ptrDecodeBuf[ptrSrcNext + nBlockSamples];
m_output[ptrDstNext+2] = (byte)m_ptrDecodeBuf[ptrSrcNext + nBlockSamples * 2];
ptrSrcNext ++;
ptrDstNext += nBytesPerPixel;
}
ptrSrcLine += (int)m_nBlockSize;
ptrDstLine += m_nDstLineBytes;
}
}
void RestoreRGB16()
{
int ptrDstLine = m_ptrDstBlock;
int ptrSrcLine = 0; //m_ptrDecodeBuf;
int nBlockSamples = (int)m_nBlockArea;
for (uint y = 0; y < m_nDstHeight; y++)
{
int ptrDstNext = ptrDstLine;
int ptrSrcNext = ptrSrcLine;
for (uint x = 0; x < m_nDstWidth; x++)
{
int word = (m_ptrDecodeBuf[ptrSrcNext] & 0x1F) |
((m_ptrDecodeBuf[ptrSrcNext + nBlockSamples] & 0x1F) << 5) |
((m_ptrDecodeBuf[ptrSrcNext + nBlockSamples * 2] & 0x1F) << 10);
m_output[ptrDstNext++] = (byte)word;
m_output[ptrDstNext++] = (byte)(word >> 8);
ptrSrcNext ++;
}
ptrSrcLine += (int)m_nBlockSize;
ptrDstLine += m_nDstLineBytes;
}
}
void RestoreGray8()
{
int ptrDstLine = m_ptrDstBlock;
int ptrSrcLine = 0; //m_ptrDecodeBuf;
for (uint y = 0; y < m_nDstHeight; y++)
{
Buffer.BlockCopy (m_ptrDecodeBuf, ptrSrcLine, m_output, ptrDstLine, (int)m_nDstWidth);
ptrSrcLine += (int)m_nBlockSize;
ptrDstLine += m_nDstLineBytes;
}
}
void ColorOperation0000 ()
{
}
void ColorOperation0101 ()
{
int ptrNext = 0; // m_ptrDecodeBuf;
uint nChSamples = m_nBlockArea;
uint nRepCount = m_nBlockArea;
do
{
sbyte nBase = m_ptrDecodeBuf[ptrNext];
m_ptrDecodeBuf[ptrNext++ + nChSamples] += nBase;
}
while (0 != --nRepCount);
}
void ColorOperation0110 ()
{
int ptrNext = 0; // m_ptrDecodeBuf;
uint nChSamples = m_nBlockArea * 2;
uint nRepCount = m_nBlockArea;
do
{
sbyte nBase = m_ptrDecodeBuf[ptrNext];
m_ptrDecodeBuf[ptrNext++ + nChSamples] += nBase;
}
while (0 != --nRepCount);
}
void ColorOperation0111 ()
{
int ptrNext = 0; // m_ptrDecodeBuf;
uint nChSamples = m_nBlockArea;
uint nRepCount = m_nBlockArea;
do
{
sbyte nBase = m_ptrDecodeBuf[ptrNext];
m_ptrDecodeBuf[ptrNext + nChSamples] += nBase;
m_ptrDecodeBuf[ptrNext + nChSamples * 2] += nBase;
ptrNext ++;
}
while (0 != --nRepCount);
}
void ColorOperation1001 ()
{
int ptrNext = 0; //m_ptrDecodeBuf;
uint nChSamples = m_nBlockArea;
uint nRepCount = m_nBlockArea;
do
{
sbyte nBase = m_ptrDecodeBuf[ptrNext + nChSamples];
m_ptrDecodeBuf[ptrNext++] += nBase;
}
while (0 != --nRepCount);
}
void ColorOperation1010 ()
{
int ptrNext = 0; // m_ptrDecodeBuf;
uint nChSamples = m_nBlockArea;
uint nRepCount = m_nBlockArea;
do
{
sbyte nBase = m_ptrDecodeBuf[ptrNext + nChSamples];
m_ptrDecodeBuf[ptrNext++ + nChSamples * 2] += nBase;
}
while (0 != --nRepCount);
}
void ColorOperation1011 ()
{
int ptrNext = 0; //m_ptrDecodeBuf;
uint nChSamples = m_nBlockArea;
uint nRepCount = m_nBlockArea;
do
{
sbyte nBase = m_ptrDecodeBuf[ptrNext + nChSamples];
m_ptrDecodeBuf[ptrNext] += nBase;
m_ptrDecodeBuf[ptrNext + nChSamples * 2] += nBase;
ptrNext ++;
}
while (0 != --nRepCount);
}
void ColorOperation1101 ()
{
int ptrNext = 0; //m_ptrDecodeBuf;
uint nChSamples = m_nBlockArea * 2;
uint nRepCount = m_nBlockArea;
do
{
sbyte nBase = m_ptrDecodeBuf[ptrNext + nChSamples];
m_ptrDecodeBuf[ptrNext++] += nBase;
}
while (0 != --nRepCount);
}
void ColorOperation1110 ()
{
int ptrNext = 0; // m_ptrDecodeBuf;
uint nChSamples = m_nBlockArea;
uint nRepCount = m_nBlockArea;
do
{
sbyte nBase = m_ptrDecodeBuf[ptrNext + nChSamples * 2];
m_ptrDecodeBuf[ptrNext++ + nChSamples] += nBase;
}
while (0 != --nRepCount);
}
void ColorOperation1111 ()
{
int ptrNext = 0; // m_ptrDecodeBuf;
uint nChSamples = m_nBlockArea;
uint nRepCount = m_nBlockArea;
do
{
sbyte nBase = m_ptrDecodeBuf[ptrNext + nChSamples * 2];
m_ptrDecodeBuf[ptrNext] += nBase;
m_ptrDecodeBuf[ptrNext + nChSamples] += nBase;
ptrNext ++;
}
while (0 != --nRepCount);
}
}
internal static class Erina
{
public const int CodeFlag = int.MinValue;
public const int HuffmanEscape = 0x7FFFFFFF;
public const int HuffmanNull = 0x8000;
public const int HuffmanMax = 0x4000;
public const int HuffmanRoot = 0x200;
};
internal class HuffmanNode
{
public ushort Weight;
public ushort Parent;
public int ChildCode;
public void CopyFrom (HuffmanNode other)
{
this.Weight = other.Weight;
this.Parent = other.Parent;
this.ChildCode = other.ChildCode;
}
}
internal class HuffmanTree
{
public HuffmanNode[] m_hnTree = new HuffmanNode[0x201];
public int[] m_iSymLookup = new int[0x100];
public int m_iEscape;
public int m_iTreePointer;
public HuffmanTree ()
{
Initialize();
}
public void Initialize ()
{
for (int i = 0; i < 0x201; i++)
{
m_hnTree[i] = new HuffmanNode();
}
for (int i = 0; i < 0x100; i++)
{
m_iSymLookup[i] = (int)Erina.HuffmanNull;
}
m_iEscape = (int)Erina.HuffmanNull;
m_iTreePointer = (int)Erina.HuffmanRoot;
m_hnTree[Erina.HuffmanRoot].Weight = 0;
m_hnTree[Erina.HuffmanRoot].Parent = Erina.HuffmanNull;
m_hnTree[Erina.HuffmanRoot].ChildCode = Erina.HuffmanNull;
}
public void IncreaseOccuredCount (int iEntry)
{
m_hnTree[iEntry].Weight++;
Normalize (iEntry);
if (m_hnTree[Erina.HuffmanRoot].Weight >= Erina.HuffmanMax)
{
HalfAndRebuild();
}
}
private void RecountOccuredCount (int iParent)
{
int iChild = m_hnTree[iParent].ChildCode;
m_hnTree[iParent].Weight = (ushort)(m_hnTree[iChild].Weight + m_hnTree[iChild + 1].Weight);
}
private void Normalize (int iEntry)
{
while (iEntry < Erina.HuffmanRoot)
{
int iSwap = iEntry + 1;
ushort weight = m_hnTree[iEntry].Weight;
while (iSwap < Erina.HuffmanRoot)
{
if (m_hnTree[iSwap].Weight >= weight)
break;
++iSwap;
}
if (iEntry == --iSwap)
{
iEntry = m_hnTree[iEntry].Parent;
RecountOccuredCount (iEntry);
continue;
}
int iChild, nCode;
if (0 == (m_hnTree[iEntry].ChildCode & Erina.CodeFlag))
{
iChild = m_hnTree[iEntry].ChildCode;
m_hnTree[iChild].Parent = (ushort)iSwap;
m_hnTree[iChild + 1].Parent = (ushort)iSwap;
}
else
{
nCode = m_hnTree[iEntry].ChildCode & ~Erina.CodeFlag;
if (nCode != Erina.HuffmanEscape)
m_iSymLookup[nCode & 0xFF] = iSwap;
else
m_iEscape = iSwap;
}
if (0 == (m_hnTree[iSwap].ChildCode & Erina.CodeFlag))
{
iChild = m_hnTree[iSwap].ChildCode;
m_hnTree[iChild].Parent = (ushort)iEntry;
m_hnTree[iChild+1].Parent = (ushort)iEntry;
}
else
{
nCode = m_hnTree[iSwap].ChildCode & ~Erina.CodeFlag;
if (nCode != Erina.HuffmanEscape)
m_iSymLookup[nCode & 0xFF] = iEntry;
else
m_iEscape = iEntry;
}
var node = m_hnTree[iSwap]; // XXX
ushort iEntryParent = m_hnTree[iEntry].Parent;
ushort iSwapParent = m_hnTree[iSwap].Parent;
m_hnTree[iSwap] = m_hnTree[iEntry];
m_hnTree[iEntry] = node;
m_hnTree[iSwap].Parent = iSwapParent;
m_hnTree[iEntry].Parent = iEntryParent;
RecountOccuredCount (iSwapParent);
iEntry = iSwapParent;
}
}
public void AddNewEntry (int nNewCode)
{
if (m_iTreePointer > 0)
{
m_iTreePointer -= 2;
int i = m_iTreePointer;
var phnNew = m_hnTree[i];
phnNew.Weight = 1;
phnNew.ChildCode = Erina.CodeFlag | nNewCode;
m_iSymLookup[nNewCode & 0xFF] = i ;
var phnRoot = m_hnTree[Erina.HuffmanRoot];
if (phnRoot.ChildCode != Erina.HuffmanNull)
{
var phnParent = m_hnTree[i + 2];
var phnChild = m_hnTree[i + 1];
phnChild.CopyFrom (phnParent); // m_hnTree[i + 1] = m_hnTree[i + 2];
if (0 != (phnChild.ChildCode & Erina.CodeFlag))
{
int nCode = phnChild.ChildCode & ~Erina.CodeFlag;
if (nCode != Erina.HuffmanEscape)
m_iSymLookup[nCode & 0xFF] = i + 1;
else
m_iEscape = i + 1;
}
phnParent.Weight = (ushort)(phnNew.Weight + phnChild.Weight);
phnParent.Parent = phnChild.Parent;
phnParent.ChildCode = i;
phnNew.Parent = phnChild.Parent = (ushort)(i + 2);
Normalize (i + 2);
}
else
{
phnNew.Parent = Erina.HuffmanRoot;
m_iEscape = i + 1;
var phnEscape = m_hnTree[m_iEscape];
phnEscape.Weight = 1;
phnEscape.Parent = Erina.HuffmanRoot;
phnEscape.ChildCode = Erina.CodeFlag | Erina.HuffmanEscape;
phnRoot.Weight = 2;
phnRoot.ChildCode = i;
}
}
else
{
int i = m_iTreePointer;
var phnEntry = m_hnTree[i];
if (phnEntry.ChildCode == (Erina.CodeFlag | Erina.HuffmanEscape))
{
phnEntry = m_hnTree[i + 1];
}
phnEntry.ChildCode = Erina.CodeFlag | nNewCode;
}
}
private void HalfAndRebuild ()
{
int i;
int iNextEntry = Erina.HuffmanRoot;
for (i = Erina.HuffmanRoot - 1; i >= m_iTreePointer; i--)
{
if (0 != (m_hnTree[i].ChildCode & Erina.CodeFlag))
{
m_hnTree[i].Weight = (ushort)((m_hnTree[i].Weight + 1) >> 1);
m_hnTree[iNextEntry--].CopyFrom (m_hnTree[i]);
}
}
++iNextEntry;
int iChild, nCode;
i = m_iTreePointer;
for (;;)
{
m_hnTree[i].CopyFrom (m_hnTree[iNextEntry]);
m_hnTree[i + 1].CopyFrom (m_hnTree[iNextEntry + 1]);
iNextEntry += 2;
var phnChild1 = m_hnTree[i];
var phnChild2 = m_hnTree[i + 1];
if (0 == (phnChild1.ChildCode & Erina.CodeFlag))
{
iChild = phnChild1.ChildCode;
m_hnTree[iChild].Parent = (ushort)i;
m_hnTree[iChild + 1].Parent = (ushort)i;
}
else
{
nCode = phnChild1.ChildCode & ~Erina.CodeFlag;
if (Erina.HuffmanEscape == nCode)
m_iEscape = i;
else
m_iSymLookup[nCode & 0xFF] = i;
}
if (0 == (phnChild2.ChildCode & Erina.CodeFlag))
{
iChild = phnChild2.ChildCode;
m_hnTree[iChild].Parent = (ushort)(i + 1);
m_hnTree[iChild + 1].Parent = (ushort)(i + 1);
}
else
{
nCode = phnChild2.ChildCode & ~Erina.CodeFlag;
if (Erina.HuffmanEscape == nCode)
m_iEscape = i + 1;
else
m_iSymLookup[nCode & 0xFF] = i + 1;
}
ushort weight = (ushort)(phnChild1.Weight + phnChild2.Weight);
if (iNextEntry <= Erina.HuffmanRoot)
{
int j = iNextEntry;
for (;;)
{
if (weight <= m_hnTree[j].Weight)
{
m_hnTree[j - 1].Weight = weight;
m_hnTree[j - 1].ChildCode = i;
break;
}
m_hnTree[j - 1].CopyFrom (m_hnTree[j]);
if (++j > Erina.HuffmanRoot)
{
m_hnTree[Erina.HuffmanRoot].Weight = weight;
m_hnTree[Erina.HuffmanRoot].ChildCode = i;
break;
}
}
--iNextEntry;
}
else
{
m_hnTree[Erina.HuffmanRoot].Weight = weight;
m_hnTree[Erina.HuffmanRoot].Parent = Erina.HuffmanNull;
m_hnTree[Erina.HuffmanRoot].ChildCode = i;
phnChild1.Parent = Erina.HuffmanRoot;
phnChild2.Parent = Erina.HuffmanRoot;
break;
}
i += 2;
}
}
}
internal class RLEDecodeContext : ERISADecodeContext
{
protected int m_flgZero;
protected uint m_nLength;
public RLEDecodeContext (uint nBufferingSize) : base (nBufferingSize)
{
}
public void InitGammaContext ()
{
m_flgZero = GetABit();
m_nLength = 0;
}
public override uint DecodeBytes (Array ptrDst, uint nCount)
{
return DecodeGammaCodeBytes (ptrDst as sbyte[], nCount);
}
public uint DecodeGammaCodeBytes (sbyte[] ptrDst, uint nCount)
{
int dst = 0;
uint nDecoded = 0;
if (m_nLength == 0)
{
m_nLength = (uint)GetGammaCode();
if (0 == m_nLength)
{
return nDecoded;
}
}
for (;;)
{
uint nRepeat = Math.Min (m_nLength, nCount);
Debug.Assert (nRepeat > 0);
m_nLength -= nRepeat;
nCount -= nRepeat;
if (0 == m_flgZero)
{
nDecoded += nRepeat;
do
{
ptrDst[dst++] = 0;
}
while (0 != --nRepeat);
}
else
{
do
{
sbyte nSign = (sbyte)GetABit();
sbyte nCode = (sbyte)GetGammaCode();
if (0 == nCode)
{
return nDecoded;
}
nDecoded ++;
ptrDst[dst++] = (sbyte)((nCode ^ nSign) - nSign);
}
while (0 != --nRepeat);
}
if (0 == nCount)
{
if (0 == m_nLength)
{
m_flgZero = ~m_flgZero;
}
return nDecoded;
}
m_flgZero = ~m_flgZero;
m_nLength = (uint) GetGammaCode();
if (0 == m_nLength)
{
return nDecoded;
}
}
}
protected int GetGammaCode()
{
if (!PrefetchBuffer())
{
return 0;
}
m_nIntBufCount--;
uint dwIntBuf = m_dwIntBuffer;
m_dwIntBuffer <<= 1;
if (0 == (dwIntBuf & 0x80000000))
{
return 1;
}
if (!PrefetchBuffer())
{
return 0;
}
int nCode = 0;
if ((0 != (~m_dwIntBuffer & 0x55000000)) && (m_nIntBufCount >= 8))
{
uint i = (m_dwIntBuffer >> 24) << 1;
nCode = nGammaCodeLookup[i];
int nBitCount = nGammaCodeLookup[i + 1];
Debug.Assert (nBitCount <= m_nIntBufCount);
Debug.Assert (nCode > 0);
m_nIntBufCount -= nBitCount;
m_dwIntBuffer <<= nBitCount;
return nCode;
}
int nBase = 2;
for (;;)
{
if (m_nIntBufCount >= 2)
{
dwIntBuf = m_dwIntBuffer;
m_dwIntBuffer <<= 2;
nCode = (int)(((uint)nCode << 1) | (dwIntBuf >> 31));
m_nIntBufCount -= 2;
if (0 == (dwIntBuf & 0x40000000))
{
return nCode + nBase;
}
nBase <<= 1;
}
else
{
if (!PrefetchBuffer())
{
return 0;
}
nCode = (int)(((uint)nCode << 1) | (m_dwIntBuffer >> 31));
m_nIntBufCount --;
m_dwIntBuffer <<= 1;
if (!PrefetchBuffer())
{
return 0;
}
dwIntBuf = m_dwIntBuffer;
m_nIntBufCount --;
m_dwIntBuffer <<= 1;
if (0 == (dwIntBuf & 0x80000000))
{
return nCode + nBase;
}
nBase <<= 1;
}
}
}
static readonly byte[] nGammaCodeLookup = new byte[0x200]
{
2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
8, 6, 8, 6, 8, 6, 8, 6, 16, 8, 0xff, 0xff, 17, 8, 0xff, 0xff,
9, 6, 9, 6, 9, 6, 9, 6, 18, 8, 0xff, 0xff, 19, 8, 0xff, 0xff,
5, 4, 5, 4, 5, 4, 5, 4, 5, 4, 5, 4, 5, 4, 5, 4,
5, 4, 5, 4, 5, 4, 5, 4, 5, 4, 5, 4, 5, 4, 5, 4,
10, 6, 10, 6, 10, 6, 10, 6, 20, 8, 0xff, 0xff, 21, 8, 0xff, 0xff,
11, 6, 11, 6, 11, 6, 11, 6, 22, 8, 0xff, 0xff, 23, 8, 0xff, 0xff,
3, 2, 3, 2, 3, 2, 3, 2, 3, 2, 3, 2, 3, 2, 3, 2,
3, 2, 3, 2, 3, 2, 3, 2, 3, 2, 3, 2, 3, 2, 3, 2,
3, 2, 3, 2, 3, 2, 3, 2, 3, 2, 3, 2, 3, 2, 3, 2,
3, 2, 3, 2, 3, 2, 3, 2, 3, 2, 3, 2, 3, 2, 3, 2,
3, 2, 3, 2, 3, 2, 3, 2, 3, 2, 3, 2, 3, 2, 3, 2,
3, 2, 3, 2, 3, 2, 3, 2, 3, 2, 3, 2, 3, 2, 3, 2,
3, 2, 3, 2, 3, 2, 3, 2, 3, 2, 3, 2, 3, 2, 3, 2,
3, 2, 3, 2, 3, 2, 3, 2, 3, 2, 3, 2, 3, 2, 3, 2,
6, 4, 6, 4, 6, 4, 6, 4, 6, 4, 6, 4, 6, 4, 6, 4,
6, 4, 6, 4, 6, 4, 6, 4, 6, 4, 6, 4, 6, 4, 6, 4,
12, 6, 12, 6, 12, 6, 12, 6, 24, 8, 0xff, 0xff, 25, 8, 0xff, 0xff,
13, 6, 13, 6, 13, 6, 13, 6, 26, 8, 0xff, 0xff, 27, 8, 0xff, 0xff,
7, 4, 7, 4, 7, 4, 7, 4, 7, 4, 7, 4, 7, 4, 7, 4,
7, 4, 7, 4, 7, 4, 7, 4, 7, 4, 7, 4, 7, 4, 7, 4,
14, 6, 14, 6, 14, 6, 14, 6, 28, 8, 0xff, 0xff, 29, 8, 0xff, 0xff,
15, 6, 15, 6, 15, 6, 15, 6, 30, 8, 0xff, 0xff, 31, 8, 0xff, 0xff
};
}
internal class HuffmanDecodeContext : RLEDecodeContext
{
int m_dwERINAFlags;
HuffmanTree m_pLastHuffmanTree;
HuffmanTree[] m_ppHuffmanTree;
// ERINAEncodingFlag
public const int efERINAOrder0 = 0x0000;
public const int efERINAOrder1 = 0x0001;
public HuffmanDecodeContext (uint nBufferingSize) : base (nBufferingSize)
{
}
public void PrepareToDecodeERINACode (int flags = efERINAOrder1)
{
int i;
if (null == m_ppHuffmanTree)
{
m_ppHuffmanTree = new HuffmanTree[0x101];
}
m_dwERINAFlags = flags;
m_nLength = 0;
if (efERINAOrder0 == flags)
{
m_ppHuffmanTree[0] = new HuffmanTree();
m_ppHuffmanTree[0x100] = new HuffmanTree();
for (i = 1; i < 0x100; i++)
{
m_ppHuffmanTree[i] = m_ppHuffmanTree[0];
}
}
else
{
for (i = 0; i < 0x101; i++)
{
m_ppHuffmanTree[i] = new HuffmanTree();
}
}
m_pLastHuffmanTree = m_ppHuffmanTree[0];
}
public override uint DecodeBytes (Array ptrDst, uint nCount)
{
return DecodeErinaCodeBytes (ptrDst as sbyte[], nCount);
}
public uint DecodeErinaCodeBytes (sbyte[] ptrDst, uint nCount)
{
var tree = m_pLastHuffmanTree;
int symbol, length;
uint i = 0;
if (m_nLength > 0)
{
length = (int)Math.Min (m_nLength, nCount);
m_nLength -= (uint)length;
do
{
ptrDst[i++] = 0;
}
while (0 != --length);
}
while (i < nCount)
{
symbol = GetHuffmanCode (tree);
if (Erina.HuffmanEscape == symbol)
{
break;
}
ptrDst[i++] = (sbyte)symbol;
if (0 == symbol)
{
length = GetLengthHuffman (m_ppHuffmanTree[0x100]);
if (Erina.HuffmanEscape == length)
{
break;
}
if (0 != --length)
{
m_nLength = (uint)length;
if (i + length > nCount)
{
length = (int)(nCount - i);
}
m_nLength -= (uint)length;
while (length > 0)
{
ptrDst[i++] = 0;
--length;
}
}
}
tree = m_ppHuffmanTree[symbol & 0xFF];
}
m_pLastHuffmanTree = tree;
return i;
}
private int GetLengthHuffman (HuffmanTree tree)
{
int nCode;
if (tree.m_iEscape != Erina.HuffmanNull)
{
int iEntry = Erina.HuffmanRoot;
int iChild = tree.m_hnTree[Erina.HuffmanRoot].ChildCode;
do
{
if (!PrefetchBuffer())
{
return Erina.HuffmanEscape;
}
iEntry = iChild + (int)(m_dwIntBuffer >> 31);
iChild = tree.m_hnTree[iEntry].ChildCode;
m_dwIntBuffer <<= 1;
--m_nIntBufCount;
}
while (0 == (iChild & Erina.CodeFlag));
if ((m_dwERINAFlags != efERINAOrder0) ||
(tree.m_hnTree[Erina.HuffmanRoot].Weight < Erina.HuffmanMax-1))
{
tree.IncreaseOccuredCount (iEntry);
}
nCode = iChild & ~Erina.CodeFlag;
if (nCode != Erina.HuffmanEscape)
{
return nCode ;
}
}
nCode = GetGammaCode();
if (-1 == nCode)
{
return Erina.HuffmanEscape;
}
tree.AddNewEntry (nCode);
return nCode;
}
public int GetHuffmanCode (HuffmanTree tree)
{
int nCode;
if (tree.m_iEscape != Erina.HuffmanNull)
{
int iEntry = Erina.HuffmanRoot;
int iChild = tree.m_hnTree[Erina.HuffmanRoot].ChildCode;
do
{
if (!PrefetchBuffer())
{
return Erina.HuffmanEscape;
}
iEntry = iChild + (int)(m_dwIntBuffer >> 31);
iChild = tree.m_hnTree[iEntry].ChildCode;
m_dwIntBuffer <<= 1;
--m_nIntBufCount;
}
while (0 == (iChild & Erina.CodeFlag));
if ((m_dwERINAFlags != efERINAOrder0) ||
(tree.m_hnTree[Erina.HuffmanRoot].Weight < Erina.HuffmanMax-1))
{
tree.IncreaseOccuredCount (iEntry);
}
nCode = iChild & ~Erina.CodeFlag;
if (nCode != Erina.HuffmanEscape)
{
return nCode;
}
}
nCode = (int)GetNBits (8);
tree.AddNewEntry (nCode);
return nCode;
}
}
}
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